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1767 Commits

Author SHA1 Message Date
Vasily Gorbik
ec687184c2 s390/ftrace: fix ftrace_update_ftrace_func implementation 
commit f8c2602733 upstream.

s390 enforces DYNAMIC_FTRACE if FUNCTION_TRACER is selected.
At the same time implementation of ftrace_caller is not compliant with
HAVE_DYNAMIC_FTRACE since it doesn't provide implementation of
ftrace_update_ftrace_func() and calls ftrace_trace_function() directly.

The subtle difference is that during ftrace code patching ftrace
replaces function tracer via ftrace_update_ftrace_func() and activates
it back afterwards. Unexpected direct calls to ftrace_trace_function()
during ftrace code patching leads to nullptr-dereferences when tracing
is activated for one of functions which are used during code patching.
Those function currently are:
copy_from_kernel_nofault()
copy_from_kernel_nofault_allowed()
preempt_count_sub() [with debug_defconfig]
preempt_count_add() [with debug_defconfig]

Corresponding KASAN report:
 BUG: KASAN: nullptr-dereference in function_trace_call+0x316/0x3b0
 Read of size 4 at addr 0000000000001e08 by task migration/0/15

 CPU: 0 PID: 15 Comm: migration/0 Tainted: G B 5.13.0-41423-g08316af3644d
 Hardware name: IBM 3906 M04 704 (LPAR)
 Stopper: multi_cpu_stop+0x0/0x3e0 <- stop_machine_cpuslocked+0x1e4/0x218
 Call Trace:
  [<0000000001f77caa>] show_stack+0x16a/0x1d0
  [<0000000001f8de42>] dump_stack+0x15a/0x1b0
  [<0000000001f81d56>] print_address_description.constprop.0+0x66/0x2e0
  [<000000000082b0ca>] kasan_report+0x152/0x1c0
  [<00000000004cfd8e>] function_trace_call+0x316/0x3b0
  [<0000000001fb7082>] ftrace_caller+0x7a/0x7e
  [<00000000006bb3e6>] copy_from_kernel_nofault_allowed+0x6/0x10
  [<00000000006bb42e>] copy_from_kernel_nofault+0x3e/0xd0
  [<000000000014605c>] ftrace_make_call+0xb4/0x1f8
  [<000000000047a1b4>] ftrace_replace_code+0x134/0x1d8
  [<000000000047a6e0>] ftrace_modify_all_code+0x120/0x1d0
  [<000000000047a7ec>] __ftrace_modify_code+0x5c/0x78
  [<000000000042395c>] multi_cpu_stop+0x224/0x3e0
  [<0000000000423212>] cpu_stopper_thread+0x33a/0x5a0
  [<0000000000243ff2>] smpboot_thread_fn+0x302/0x708
  [<00000000002329ea>] kthread+0x342/0x408
  [<00000000001066b2>] __ret_from_fork+0x92/0xf0
  [<0000000001fb57fa>] ret_from_fork+0xa/0x30

 The buggy address belongs to the page:
 page:(____ptrval____) refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1
 flags: 0x1ffff00000001000(reserved|node=0|zone=0|lastcpupid=0x1ffff)
 raw: 1ffff00000001000 0000040000000048 0000040000000048 0000000000000000
 raw: 0000000000000000 0000000000000000 ffffffff00000001 0000000000000000
 page dumped because: kasan: bad access detected

 Memory state around the buggy address:
  0000000000001d00: f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7
  0000000000001d80: f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7
 >0000000000001e00: f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7
                       ^
  0000000000001e80: f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7
  0000000000001f00: f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7 f7
 ==================================================================

To fix that introduce ftrace_func callback to be called from
ftrace_caller and update it in ftrace_update_ftrace_func().

Fixes: 4cc9bed034 ("[S390] cleanup ftrace backend functions")
Cc: stable@vger.kernel.org
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-05-16 11:34:13 +09:00
Sven Schnelle
5d89b192b8 s390: don't trace preemption in percpu macros 
[ Upstream commit 1196f12a2c ]

Since commit a21ee6055c ("lockdep: Change hardirq{s_enabled,_context}
to per-cpu variables") the lockdep code itself uses percpu variables. This
leads to recursions because the percpu macros are calling preempt_enable()
which might call trace_preempt_on().

Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Reviewed-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
 2023-05-16 09:04:13 +09:00
Christian Borntraeger
2173eee31d KVM: s390: reduce number of IO pins to 1 
[ Upstream commit 774911290c ]

The current number of KVM_IRQCHIP_NUM_PINS results in an order 3
allocation (32kb) for each guest start/restart. This can result in OOM
killer activity even with free swap when the memory is fragmented
enough:

kernel: qemu-system-s39 invoked oom-killer: gfp_mask=0x440dc0(GFP_KERNEL_ACCOUNT|__GFP_COMP|__GFP_ZERO), order=3, oom_score_adj=0
kernel: CPU: 1 PID: 357274 Comm: qemu-system-s39 Kdump: loaded Not tainted 5.4.0-29-generic #33-Ubuntu
kernel: Hardware name: IBM 8562 T02 Z06 (LPAR)
kernel: Call Trace:
kernel: ([<00000001f848fe2a>] show_stack+0x7a/0xc0)
kernel:  [<00000001f8d3437a>] dump_stack+0x8a/0xc0
kernel:  [<00000001f8687032>] dump_header+0x62/0x258
kernel:  [<00000001f8686122>] oom_kill_process+0x172/0x180
kernel:  [<00000001f8686abe>] out_of_memory+0xee/0x580
kernel:  [<00000001f86e66b8>] __alloc_pages_slowpath+0xd18/0xe90
kernel:  [<00000001f86e6ad4>] __alloc_pages_nodemask+0x2a4/0x320
kernel:  [<00000001f86b1ab4>] kmalloc_order+0x34/0xb0
kernel:  [<00000001f86b1b62>] kmalloc_order_trace+0x32/0xe0
kernel:  [<00000001f84bb806>] kvm_set_irq_routing+0xa6/0x2e0
kernel:  [<00000001f84c99a4>] kvm_arch_vm_ioctl+0x544/0x9e0
kernel:  [<00000001f84b8936>] kvm_vm_ioctl+0x396/0x760
kernel:  [<00000001f875df66>] do_vfs_ioctl+0x376/0x690
kernel:  [<00000001f875e304>] ksys_ioctl+0x84/0xb0
kernel:  [<00000001f875e39a>] __s390x_sys_ioctl+0x2a/0x40
kernel:  [<00000001f8d55424>] system_call+0xd8/0x2c8

As far as I can tell s390x does not use the iopins as we bail our for
anything other than KVM_IRQ_ROUTING_S390_ADAPTER and the chip/pin is
only used for KVM_IRQ_ROUTING_IRQCHIP. So let us use a small number to
reduce the memory footprint.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Link: https://lore.kernel.org/r/20200617083620.5409-1-borntraeger@de.ibm.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
 2023-05-16 08:29:34 +09:00
Dmitry V. Levin
b98856ef01 s390: fix syscall_get_error for compat processes 
commit b3583fca5f upstream.

If both the tracer and the tracee are compat processes, and gprs[2]
is assigned a value by __poke_user_compat, then the higher 32 bits
of gprs[2] are cleared, IS_ERR_VALUE() always returns false, and
syscall_get_error() always returns 0.

Fix the implementation by sign-extending the value for compat processes
the same way as x86 implementation does.

The bug was exposed to user space by commit 201766a20e ("ptrace: add
PTRACE_GET_SYSCALL_INFO request") and detected by strace test suite.

This change fixes strace syscall tampering on s390.

Link: https://lkml.kernel.org/r/20200602180051.GA2427@altlinux.org
Fixes: 753c4dd6a2 ("[S390] ptrace changes")
Cc: Elvira Khabirova <lineprinter@altlinux.org>
Cc: stable@vger.kernel.org # v2.6.28+
Signed-off-by: Dmitry V. Levin <ldv@altlinux.org>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-05-16 08:20:29 +09:00
Nathan Chancellor
261632e7e8 s390/mm: Explicitly compare PAGE_DEFAULT_KEY against zero in storage_key_init_range 
commit 3803247349 upstream.

Clang warns:

 In file included from ../arch/s390/purgatory/purgatory.c:10:
 In file included from ../include/linux/kexec.h:18:
 In file included from ../include/linux/crash_core.h:6:
 In file included from ../include/linux/elfcore.h:5:
 In file included from ../include/linux/user.h:1:
 In file included from ../arch/s390/include/asm/user.h:11:
 ../arch/s390/include/asm/page.h:45:6: warning: converting the result of
 '<<' to a boolean always evaluates to false
 [-Wtautological-constant-compare]
         if (PAGE_DEFAULT_KEY)
            ^
 ../arch/s390/include/asm/page.h:23:44: note: expanded from macro
 'PAGE_DEFAULT_KEY'
 #define PAGE_DEFAULT_KEY        (PAGE_DEFAULT_ACC << 4)
                                                  ^
 1 warning generated.

Explicitly compare this against zero to silence the warning as it is
intended to be used in a boolean context.

Fixes: de3fa841e4 ("s390/mm: fix compile for PAGE_DEFAULT_KEY != 0")
Link: https://github.com/ClangBuiltLinux/linux/issues/860
Link: https://lkml.kernel.org/r/20200214064207.10381-1-natechancellor@gmail.com
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-05-15 17:01:01 +09:00
Nathan Chancellor
f364ea4dac s390/time: Fix clk type in get_tod_clock 
commit 0f8a206df7 upstream.

Clang warns:

In file included from ../arch/s390/boot/startup.c:3:
In file included from ../include/linux/elf.h:5:
In file included from ../arch/s390/include/asm/elf.h:132:
In file included from ../include/linux/compat.h:10:
In file included from ../include/linux/time.h:74:
In file included from ../include/linux/time32.h:13:
In file included from ../include/linux/timex.h:65:
../arch/s390/include/asm/timex.h:160:20: warning: passing 'unsigned char
[16]' to parameter of type 'char *' converts between pointers to integer
types with different sign [-Wpointer-sign]
        get_tod_clock_ext(clk);
                          ^~~
../arch/s390/include/asm/timex.h:149:44: note: passing argument to
parameter 'clk' here
static inline void get_tod_clock_ext(char *clk)
                                           ^

Change clk's type to just be char so that it matches what happens in
get_tod_clock_ext.

Fixes: 57b28f6631 ("[S390] s390_hypfs: Add new attributes")
Link: https://github.com/ClangBuiltLinux/linux/issues/861
Link: http://lkml.kernel.org/r/20200208140858.47970-1-natechancellor@gmail.com
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-05-15 16:57:48 +09:00
Christian Borntraeger
2679350a5a s390/uaccess: avoid (false positive) compiler warnings 
[ Upstream commit 062795fcdc ]

Depending on inlining decisions by the compiler, __get/put_user_fn
might become out of line. Then the compiler is no longer able to tell
that size can only be 1,2,4 or 8 due to the check in __get/put_user
resulting in false positives like

./arch/s390/include/asm/uaccess.h: In function ‘__put_user_fn’:
./arch/s390/include/asm/uaccess.h:113:9: warning: ‘rc’ may be used uninitialized in this function [-Wmaybe-uninitialized]
  113 |  return rc;
      |         ^~
./arch/s390/include/asm/uaccess.h: In function ‘__get_user_fn’:
./arch/s390/include/asm/uaccess.h:143:9: warning: ‘rc’ may be used uninitialized in this function [-Wmaybe-uninitialized]
  143 |  return rc;
      |         ^~

These functions are supposed to be always inlined. Mark it as such.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
 2023-05-15 14:55:24 +09:00
Heiko Carstens
df1d9e2580 s390: fix stfle zero padding 
commit 4f18d869ff upstream.

The stfle inline assembly returns the number of double words written
(condition code 0) or the double words it would have written
(condition code 3), if the memory array it got as parameter would have
been large enough.

The current stfle implementation assumes that the array is always
large enough and clears those parts of the array that have not been
written to with a subsequent memset call.

If however the array is not large enough memset will get a negative
length parameter, which means that memset clears memory until it gets
an exception and the kernel crashes.

To fix this simply limit the maximum length. Move also the inline
assembly to an extra function to avoid clobbering of register 0, which
might happen because of the added min_t invocation together with code
instrumentation.

The bug was introduced with commit 14375bc4eb ("[S390] cleanup
facility list handling") but was rather harmless, since it would only
write to a rather large array. It became a potential problem with
commit 3ab121ab18 ("[S390] kernel: Add z/VM LGR detection"). Since
then it writes to an array with only four double words, while some
machines already deliver three double words. As soon as machines have
a facility bit within the fifth double a crash on IPL would happen.

Fixes: 14375bc4eb ("[S390] cleanup facility list handling")
Cc: <stable@vger.kernel.org> # v2.6.37+
Reviewed-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-05-15 13:59:12 +09:00
Martin Schwidefsky
5e6005ef70 s390: limit brk randomization to 32MB 
[ Upstream commit cd479eccd2 ]

For a 64-bit process the randomization of the program break is quite
large with 1GB. That is as big as the randomization of the anonymous
mapping base, for a test case started with '/lib/ld64.so.1 <exec>'
it can happen that the heap is placed after the stack. To avoid
this limit the program break randomization to 32MB for 64-bit and
keep 8MB for 31-bit.

Reported-by: Stefan Liebler <stli@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Sasha Levin (Microsoft) <sashal@kernel.org>
 2023-05-15 12:36:37 +09:00
Julian Wiedmann
8ccf4e6e0c s390/qdio: reset old sbal_state flags 
commit 64e03ff726 upstream.

When allocating a new AOB fails, handle_outbound() is still capable of
transmitting the selected buffer (just without async completion).

But if a previous transfer on this queue slot used async completion, its
sbal_state flags field is still set to QDIO_OUTBUF_STATE_FLAG_PENDING.
So when the upper layer driver sees this stale flag, it expects an async
completion that never happens.

Fix this by unconditionally clearing the flags field.

Fixes: 104ea556ee ("qdio: support asynchronous delivery of storage blocks")
Cc: <stable@vger.kernel.org> #v3.2+
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-05-12 17:16:36 +09:00
Thomas Richter
bf8f09756c perf: fix invalid bit in diagnostic entry 
[ Upstream commit 3c0a83b14e ]

The s390 CPU measurement facility sampling mode supports basic entries
and diagnostic entries. Each entry has a valid bit to indicate the
status of the entry as valid or invalid.

This bit is bit 31 in the diagnostic entry, but the bit mask definition
refers to bit 30.

Fix this by making the reserved field one bit larger.

Fixes: 7e75fc3ff4 ("s390/cpum_sf: Add raw data sampling to support the diagnostic-sampling function")
Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
Reviewed-by: Hendrik Brueckner <brueckner@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-05-12 16:42:57 +09:00
Thomas Richter
3ed158e71e s390/cpum_sf: Add data entry sizes to sampling trailer entry 
[ Upstream commit 77715b7ddb ]

The CPU Measurement sampling facility creates a trailer entry for each
Sample-Data-Block of stored samples. The trailer entry contains the sizes
(in bytes) of the stored sampling types:
 - basic-sampling data entry size
 - diagnostic-sampling data entry size
Both sizes are 2 bytes long.

This patch changes the trailer entry definition to reflect this.

Fixes: fcc77f5073 ("s390/cpum_sf: Atomically reset trailer entry fields of sample-data-blocks")
Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
Reviewed-by: Hendrik Brueckner <brueckner@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2023-05-12 16:42:54 +09:00
Greg Kroah-Hartman
70c65e471b Merge 4.9.103 into android-4.9 
Changes in 4.9.103
	net/mlx4_core: Fix error handling in mlx4_init_port_info.
	net: test tailroom before appending to linear skb
	packet: in packet_snd start writing at link layer allocation
	sock_diag: fix use-after-free read in __sk_free
	tcp: purge write queue in tcp_connect_init()
	vmxnet3: set the DMA mask before the first DMA map operation
	vmxnet3: use DMA memory barriers where required
	ext2: fix a block leak
	s390: add assembler macros for CPU alternatives
	s390: move expoline assembler macros to a header
	s390/crc32-vx: use expoline for indirect branches
	s390/lib: use expoline for indirect branches
	s390/ftrace: use expoline for indirect branches
	s390/kernel: use expoline for indirect branches
	s390: move spectre sysfs attribute code
	s390: extend expoline to BC instructions
	s390: use expoline thunks in the BPF JIT
	scsi: libsas: defer ata device eh commands to libata
	scsi: sg: allocate with __GFP_ZERO in sg_build_indirect()
	scsi: zfcp: fix infinite iteration on ERP ready list
	cfg80211: limit wiphy names to 128 bytes
	hfsplus: stop workqueue when fill_super() failed
	x86/kexec: Avoid double free_page() upon do_kexec_load() failure
	usb: gadget: f_uac2: fix bFirstInterface in composite gadget
	usb: dwc3: Undo PHY init if soft reset fails
	usb: dwc3: omap: don't miss events during suspend/resume
	usb: gadget: core: Fix use-after-free of usb_request
	usb: gadget: fsl_udc_core: fix ep valid checks
	usb: dwc2: Fix dwc2_hsotg_core_init_disconnected()
	usb: cdc_acm: prevent race at write to acm while system resumes
	USB: OHCI: Fix NULL dereference in HCDs using HCD_LOCAL_MEM
	net/usb/qmi_wwan.c: Add USB id for lt4120 modem
	net-usb: add qmi_wwan if on lte modem wistron neweb d18q1
	Bluetooth: btusb: Add USB ID 7392:a611 for Edimax EW-7611ULB
	ALSA: usb-audio: Add native DSD support for Luxman DA-06
	usb: dwc3: Add SoftReset PHY synchonization delay
	usb: dwc3: Update DWC_usb31 GTXFIFOSIZ reg fields
	xhci: zero usb device slot_id member when disabling and freeing a xhci slot
	usb: dwc2: Fix interval type issue
	usb: dwc2: host: Fix transaction errors in host mode
	usb: gadget: ffs: Let setup() return USB_GADGET_DELAYED_STATUS
	usb: gadget: ffs: Execute copy_to_user() with USER_DS set
	usb: gadget: udc: change comparison to bitshift when dealing with a mask
	usb: gadget: composite: fix incorrect handling of OS desc requests
	media: em28xx: USB bulk packet size fix
	Bluetooth: btusb: Add device ID for RTL8822BE
	staging: lustre: fix bug in osc_enter_cache_try
	staging: rtl8192u: return -ENOMEM on failed allocation of priv->oldaddr
	staging: lustre: lmv: correctly iput lmo_root
	crypto: sunxi-ss - Add MODULE_ALIAS to sun4i-ss
	scsi: fas216: fix sense buffer initialization
	scsi: ufs: Enable quirk to ignore sending WRITE_SAME command
	scsi: bnx2fc: Fix check in SCSI completion handler for timed out request
	scsi: sym53c8xx_2: iterator underflow in sym_getsync()
	scsi: mptfusion: Add bounds check in mptctl_hp_targetinfo()
	scsi: qla2xxx: Avoid triggering undefined behavior in qla2x00_mbx_completion()
	scsi: storvsc: Increase cmd_per_lun for higher speed devices
	scsi: aacraid: fix shutdown crash when init fails
	scsi: qla4xxx: skip error recovery in case of register disconnect.
	scsi: mpt3sas: Do not mark fw_event workqueue as WQ_MEM_RECLAIM
	scsi: sd: Keep disk read-only when re-reading partition
	scsi: aacraid: Insure command thread is not recursively stopped
	scsi: mvsas: fix wrong endianness of sgpio api
	scsi: lpfc: Fix issue_lip if link is disabled
	scsi: lpfc: Fix soft lockup in lpfc worker thread during LIP testing
	scsi: lpfc: Fix frequency of Release WQE CQEs
	ASoC: au1x: Fix timeout tests in au1xac97c_ac97_read()
	ASoC: topology: create TLV data for dapm widgets
	ASoC: samsung: i2s: Ensure the RCLK rate is properly determined
	clk: rockchip: Fix wrong parent for SDMMC phase clock for rk3228
	clk: Don't show the incorrect clock phase
	clk: tegra: Fix pll_u rate configuration
	media: cx23885: Set subdev host data to clk_freq pointer
	clk: rockchip: Prevent calculating mmc phase if clock rate is zero
	clk: samsung: s3c2410: Fix PLL rates
	clk: samsung: exynos7: Fix PLL rates
	clk: samsung: exynos5260: Fix PLL rates
	clk: samsung: exynos5433: Fix PLL rates
	clk: samsung: exynos5250: Fix PLL rates
	clk: samsung: exynos3250: Fix PLL rates
	media: dmxdev: fix error code for invalid ioctls
	media: cx23885: Override 888 ImpactVCBe crystal frequency
	media: s3c-camif: fix out-of-bounds array access
	media: vb2: Fix videobuf2 to map correct area
	media: vivid: fix incorrect capabilities for radio
	media: cx25821: prevent out-of-bounds read on array card
	serial: xuartps: Fix out-of-bounds access through DT alias
	serial: samsung: Fix out-of-bounds access through serial port index
	serial: mxs-auart: Fix out-of-bounds access through serial port index
	serial: imx: Fix out-of-bounds access through serial port index
	serial: fsl_lpuart: Fix out-of-bounds access through DT alias
	serial: arc_uart: Fix out-of-bounds access through DT alias
	serial: 8250: Don't service RX FIFO if interrupts are disabled
	rtc: snvs: Fix usage of snvs_rtc_enable
	rtc: hctosys: Ensure system time doesn't overflow time_t
	rtc: tx4939: avoid unintended sign extension on a 24 bit shift
	Linux 4.9.103

Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
 2018-05-25 17:06:35 +02:00
Martin Schwidefsky
1ace5fcb22 s390: extend expoline to BC instructions 
[ Upstream commit 6deaa3bbca ]

The BPF JIT uses a 'b <disp>(%r<x>)' instruction in the definition
of the sk_load_word and sk_load_half functions.

Add support for branch-on-condition instructions contained in the
thunk code of an expoline.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2018-05-25 16:12:58 +02:00
Martin Schwidefsky
caa47e1f7f s390/ftrace: use expoline for indirect branches 
[ Upstream commit 23a4d7fd34 ]

The return from the ftrace_stub, _mcount, ftrace_caller and
return_to_handler functions is done with "br %r14" and "br %r1".
These are indirect branches as well and need to use execute
trampolines for CONFIG_EXPOLINE=y.

The ftrace_caller function is a special case as it returns to the
start of a function and may only use %r0 and %r1. For a pre z10
machine the standard execute trampoline uses a LARL + EX to do
this, but this requires *two* registers in the range %r1..%r15.
To get around this the 'br %r1' located in the lowcore is used,
then the EX instruction does not need an address register.
But the lowcore trick may only be used for pre z14 machines,
with noexec=on the mapping for the first page may not contain
instructions. The solution for that is an ALTERNATIVE in the
expoline THUNK generated by 'GEN_BR_THUNK %r1' to switch to
EXRL, this relies on the fact that a machine that supports
noexec=on has EXRL as well.

Cc: stable@vger.kernel.org # 4.16
Fixes: f19fbd5ed6 ("s390: introduce execute-trampolines for branches")
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2018-05-25 16:12:57 +02:00
Martin Schwidefsky
4a5c26ddfb s390: move expoline assembler macros to a header 
[ Upstream commit 6dd85fbb87 ]

To be able to use the expoline branches in different assembler
files move the associated macros from entry.S to a new header
nospec-insn.h.

While we are at it make the macros a bit nicer to use.

Cc: stable@vger.kernel.org # 4.16
Fixes: f19fbd5ed6 ("s390: introduce execute-trampolines for branches")
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2018-05-25 16:12:56 +02:00
Martin Schwidefsky
63257f26ce s390: add assembler macros for CPU alternatives 
[ Upstream commit fba9eb7946 ]

Add a header with macros usable in assembler files to emit alternative
code sequences. It works analog to the alternatives for inline assmeblies
in C files, with the same restrictions and capabilities.
The syntax is

     ALTERNATIVE "<default instructions sequence>", \
		 "<alternative instructions sequence>", \
		 "<features-bit>"
and

     ALTERNATIVE_2 "<default instructions sequence>", \
		   "<alternative instructions sqeuence #1>", \
		   "<feature-bit #1>",
		   "<alternative instructions sqeuence #2>", \
		   "<feature-bit #2>"

Reviewed-by: Vasily Gorbik <gor@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2018-05-25 16:12:56 +02:00
Greg Kroah-Hartman
aef17a58e8 Merge 4.9.101 into android-4.9 
Changes in 4.9.101
	8139too: Use disable_irq_nosync() in rtl8139_poll_controller()
	bridge: check iface upper dev when setting master via ioctl
	dccp: fix tasklet usage
	ipv4: fix memory leaks in udp_sendmsg, ping_v4_sendmsg
	llc: better deal with too small mtu
	net: ethernet: sun: niu set correct packet size in skb
	net: ethernet: ti: cpsw: fix packet leaking in dual_mac mode
	net/mlx4_en: Verify coalescing parameters are in range
	net/mlx5: E-Switch, Include VF RDMA stats in vport statistics
	net_sched: fq: take care of throttled flows before reuse
	net: support compat 64-bit time in {s,g}etsockopt
	openvswitch: Don't swap table in nlattr_set() after OVS_ATTR_NESTED is found
	qmi_wwan: do not steal interfaces from class drivers
	r8169: fix powering up RTL8168h
	sctp: handle two v4 addrs comparison in sctp_inet6_cmp_addr
	sctp: remove sctp_chunk_put from fail_mark err path in sctp_ulpevent_make_rcvmsg
	sctp: use the old asoc when making the cookie-ack chunk in dupcook_d
	tcp_bbr: fix to zero idle_restart only upon S/ACKed data
	tg3: Fix vunmap() BUG_ON() triggered from tg3_free_consistent().
	bonding: do not allow rlb updates to invalid mac
	net/mlx5: Avoid cleaning flow steering table twice during error flow
	bonding: send learning packets for vlans on slave
	tcp: ignore Fast Open on repair mode
	sctp: fix the issue that the cookie-ack with auth can't get processed
	sctp: delay the authentication for the duplicated cookie-echo chunk
	serial: sccnxp: Fix error handling in sccnxp_probe()
	futex: Remove duplicated code and fix undefined behaviour
	xfrm: fix xfrm_do_migrate() with AEAD e.g(AES-GCM)
	lockd: lost rollback of set_grace_period() in lockd_down_net()
	Revert "ARM: dts: imx6qdl-wandboard: Fix audio channel swap"
	l2tp: revert "l2tp: fix missing print session offset info"
	nfp: TX time stamp packets before HW doorbell is rung
	proc: do not access cmdline nor environ from file-backed areas
	futex: futex_wake_op, fix sign_extend32 sign bits
	kernel/exit.c: avoid undefined behaviour when calling wait4()
	Linux 4.9.101

Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
 2018-05-19 14:06:17 +02:00
Jiri Slaby
81da9f87ad futex: Remove duplicated code and fix undefined behaviour 
commit 30d6e0a419 upstream.

There is code duplicated over all architecture's headers for
futex_atomic_op_inuser. Namely op decoding, access_ok check for uaddr,
and comparison of the result.

Remove this duplication and leave up to the arches only the needed
assembly which is now in arch_futex_atomic_op_inuser.

This effectively distributes the Will Deacon's arm64 fix for undefined
behaviour reported by UBSAN to all architectures. The fix was done in
commit 5f16a046f8 (arm64: futex: Fix undefined behaviour with
FUTEX_OP_OPARG_SHIFT usage). Look there for an example dump.

And as suggested by Thomas, check for negative oparg too, because it was
also reported to cause undefined behaviour report.

Note that s390 removed access_ok check in d12a29703 ("s390/uaccess:
remove pointless access_ok() checks") as access_ok there returns true.
We introduce it back to the helper for the sake of simplicity (it gets
optimized away anyway).

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Russell King <rmk+kernel@armlinux.org.uk>
Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com> [s390]
Acked-by: Chris Metcalf <cmetcalf@mellanox.com> [for tile]
Reviewed-by: Darren Hart (VMware) <dvhart@infradead.org>
Reviewed-by: Will Deacon <will.deacon@arm.com> [core/arm64]
Cc: linux-mips@linux-mips.org
Cc: Rich Felker <dalias@libc.org>
Cc: linux-ia64@vger.kernel.org
Cc: linux-sh@vger.kernel.org
Cc: peterz@infradead.org
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: sparclinux@vger.kernel.org
Cc: Jonas Bonn <jonas@southpole.se>
Cc: linux-s390@vger.kernel.org
Cc: linux-arch@vger.kernel.org
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: linux-hexagon@vger.kernel.org
Cc: Helge Deller <deller@gmx.de>
Cc: "James E.J. Bottomley" <jejb@parisc-linux.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Matt Turner <mattst88@gmail.com>
Cc: linux-snps-arc@lists.infradead.org
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: linux-xtensa@linux-xtensa.org
Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
Cc: openrisc@lists.librecores.org
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Stafford Horne <shorne@gmail.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: Richard Henderson <rth@twiddle.net>
Cc: Chris Zankel <chris@zankel.net>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Tony Luck <tony.luck@intel.com>
Cc: linux-parisc@vger.kernel.org
Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Richard Kuo <rkuo@codeaurora.org>
Cc: linux-alpha@vger.kernel.org
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: linuxppc-dev@lists.ozlabs.org
Cc: "David S. Miller" <davem@davemloft.net>
Link: http://lkml.kernel.org/r/20170824073105.3901-1-jslaby@suse.cz
Cc: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2018-05-19 10:27:00 +02:00
Greg Kroah-Hartman
c462abbf77 Merge 4.9.99 into android-4.9 
Changes in 4.9.99
	perf/core: Fix the perf_cpu_time_max_percent check
	percpu: include linux/sched.h for cond_resched()
	bpf: map_get_next_key to return first key on NULL
	arm/arm64: KVM: Add PSCI version selection API
	crypto: talitos - fix IPsec cipher in length
	serial: imx: ensure UCR3 and UFCR are setup correctly
	USB: serial: option: Add support for Quectel EP06
	ALSA: pcm: Check PCM state at xfern compat ioctl
	ALSA: seq: Fix races at MIDI encoding in snd_virmidi_output_trigger()
	ALSA: aloop: Mark paused device as inactive
	ALSA: aloop: Add missing cable lock to ctl API callbacks
	tracepoint: Do not warn on ENOMEM
	Input: leds - fix out of bound access
	Input: atmel_mxt_ts - add touchpad button mapping for Samsung Chromebook Pro
	xfs: prevent creating negative-sized file via INSERT_RANGE
	RDMA/cxgb4: release hw resources on device removal
	RDMA/ucma: Allow resolving address w/o specifying source address
	RDMA/mlx5: Protect from shift operand overflow
	NET: usb: qmi_wwan: add support for ublox R410M PID 0x90b2
	IB/mlx5: Use unlimited rate when static rate is not supported
	IB/hfi1: Fix NULL pointer dereference when invalid num_vls is used
	drm/vmwgfx: Fix a buffer object leak
	drm/bridge: vga-dac: Fix edid memory leak
	test_firmware: fix setting old custom fw path back on exit, second try
	USB: serial: visor: handle potential invalid device configuration
	USB: Accept bulk endpoints with 1024-byte maxpacket
	USB: serial: option: reimplement interface masking
	USB: serial: option: adding support for ublox R410M
	usb: musb: host: fix potential NULL pointer dereference
	usb: musb: trace: fix NULL pointer dereference in musb_g_tx()
	platform/x86: asus-wireless: Fix NULL pointer dereference
	s390/facilites: use stfle_fac_list array size for MAX_FACILITY_BIT
	Linux 4.9.99

Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
 2018-05-09 12:28:25 +02:00
Heiko Carstens
bce133ab7d s390/facilites: use stfle_fac_list array size for MAX_FACILITY_BIT 
commit 6f5165e864 upstream.

Use the actual size of the facility list array within the lowcore
structure for the MAX_FACILITY_BIT define instead of a comment which
states what this is good for. This makes it a bit harder to break
things.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2018-05-09 09:50:24 +02:00
Greg Kroah-Hartman
2bcbbd5b39 Merge 4.9.97 into android-4.9 
Changes in 4.9.97
	cifs: do not allow creating sockets except with SMB1 posix exensions
	x86/tsc: Prevent 32bit truncation in calc_hpet_ref()
	drm/vc4: Fix memory leak during BO teardown
	drm/i915: Fix LSPCON TMDS output buffer enabling from low-power state
	i2c: i801: store and restore the SLVCMD register at load and unload
	i2c: i801: Save register SMBSLVCMD value only once
	i2c: i801: Restore configuration at shutdown
	usb: musb: fix enumeration after resume
	usb: musb: call pm_runtime_{get,put}_sync before reading vbus registers
	usb: musb: Fix external abort in musb_remove on omap2430
	MIPS: Generic: Fix big endian CPUs on generic machine
	Input: drv260x - fix initializing overdrive voltage
	power: supply: bq2415x: check for NULL acpi_id to avoid null pointer dereference
	stk-webcam: fix an endian bug in stk_camera_read_reg()
	OF: Prevent unaligned access in of_alias_scan()
	ath9k_hw: check if the chip failed to wake up
	jbd2: fix use after free in kjournald2()
	Revert "perf tools: Decompress kernel module when reading DSO data"
	perf: Fix sample_max_stack maximum check
	perf: Return proper values for user stack errors
	RDMA/mlx5: Fix NULL dereference while accessing XRC_TGT QPs
	drm/i915/bxt, glk: Increase PCODE timeouts during CDCLK freq changing
	mac80211_hwsim: fix use-after-free bug in hwsim_exit_net
	r8152: add Linksys USB3GIGV1 id
	Revert "pinctrl: intel: Initialize GPIO properly when used through irqchip"
	Revert "ath10k: send (re)assoc peer command when NSS changed"
	PCI: Wait up to 60 seconds for device to become ready after FLR
	s390: introduce CPU alternatives
	s390: enable CPU alternatives unconditionally
	KVM: s390: wire up bpb feature
	s390: scrub registers on kernel entry and KVM exit
	s390: add optimized array_index_mask_nospec
	s390/alternative: use a copy of the facility bit mask
	s390: add options to change branch prediction behaviour for the kernel
	s390: run user space and KVM guests with modified branch prediction
	s390: introduce execute-trampolines for branches
	KVM: s390: force bp isolation for VSIE
	s390: Replace IS_ENABLED(EXPOLINE_*) with IS_ENABLED(CONFIG_EXPOLINE_*)
	s390: do not bypass BPENTER for interrupt system calls
	s390/entry.S: fix spurious zeroing of r0
	s390: move nobp parameter functions to nospec-branch.c
	s390: add automatic detection of the spectre defense
	s390: report spectre mitigation via syslog
	s390: add sysfs attributes for spectre
	s390: correct nospec auto detection init order
	s390: correct module section names for expoline code revert
	bonding: do not set slave_dev npinfo before slave_enable_netpoll in bond_enslave
	KEYS: DNS: limit the length of option strings
	l2tp: check sockaddr length in pppol2tp_connect()
	net: validate attribute sizes in neigh_dump_table()
	llc: delete timers synchronously in llc_sk_free()
	tcp: don't read out-of-bounds opsize
	team: avoid adding twice the same option to the event list
	team: fix netconsole setup over team
	packet: fix bitfield update race
	tipc: add policy for TIPC_NLA_NET_ADDR
	pppoe: check sockaddr length in pppoe_connect()
	vlan: Fix reading memory beyond skb->tail in skb_vlan_tagged_multi
	sctp: do not check port in sctp_inet6_cmp_addr
	net: sched: ife: signal not finding metaid
	llc: hold llc_sap before release_sock()
	llc: fix NULL pointer deref for SOCK_ZAPPED
	net: ethernet: ti: cpsw: fix tx vlan priority mapping
	net: fix deadlock while clearing neighbor proxy table
	tcp: md5: reject TCP_MD5SIG or TCP_MD5SIG_EXT on established sockets
	net: af_packet: fix race in PACKET_{R|T}X_RING
	ipv6: add RTA_TABLE and RTA_PREFSRC to rtm_ipv6_policy
	strparser: Fix incorrect strp->need_bytes value.
	scsi: mptsas: Disable WRITE SAME
	cdrom: information leak in cdrom_ioctl_media_changed()
	s390/cio: update chpid descriptor after resource accessibility event
	s390/dasd: fix IO error for newly defined devices
	s390/uprobes: implement arch_uretprobe_is_alive()
	ACPI / video: Only default only_lcd to true on Win8-ready _desktops_
	Linux 4.9.97

Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
 2018-04-30 06:05:25 -07:00
Martin Schwidefsky
906cd975f6 s390: correct nospec auto detection init order 
[ Upstream commit 6a3d1e81a4 ]

With CONFIG_EXPOLINE_AUTO=y the call of spectre_v2_auto_early() via
early_initcall is done *after* the early_param functions. This
overwrites any settings done with the nobp/no_spectre_v2/spectre_v2
parameters. The code patching for the kernel is done after the
evaluation of the early parameters but before the early_initcall
is done. The end result is a kernel image that is patched correctly
but the kernel modules are not.

Make sure that the nospec auto detection function is called before the
early parameters are evaluated and before the code patching is done.

Fixes: 6e179d6412 ("s390: add automatic detection of the spectre defense")
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2018-04-29 11:32:00 +02:00
Martin Schwidefsky
3e17958c6b s390: add automatic detection of the spectre defense 
[ Upstream commit 6e179d6412 ]

Automatically decide between nobp vs. expolines if the spectre_v2=auto
kernel parameter is specified or CONFIG_EXPOLINE_AUTO=y is set.

The decision made at boot time due to CONFIG_EXPOLINE_AUTO=y being set
can be overruled with the nobp, nospec and spectre_v2 kernel parameters.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2018-04-29 11:31:59 +02:00
Martin Schwidefsky
24fbc4eee8 s390: introduce execute-trampolines for branches 
[ Upstream commit f19fbd5ed6 ]

Add CONFIG_EXPOLINE to enable the use of the new -mindirect-branch= and
-mfunction_return= compiler options to create a kernel fortified against
the specte v2 attack.

With CONFIG_EXPOLINE=y all indirect branches will be issued with an
execute type instruction. For z10 or newer the EXRL instruction will
be used, for older machines the EX instruction. The typical indirect
call

	basr	%r14,%r1

is replaced with a PC relative call to a new thunk

	brasl	%r14,__s390x_indirect_jump_r1

The thunk contains the EXRL/EX instruction to the indirect branch

__s390x_indirect_jump_r1:
	exrl	0,0f
	j	.
0:	br	%r1

The detour via the execute type instruction has a performance impact.
To get rid of the detour the new kernel parameter "nospectre_v2" and
"spectre_v2=[on,off,auto]" can be used. If the parameter is specified
the kernel and module code will be patched at runtime.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2018-04-29 11:31:59 +02:00
Martin Schwidefsky
a1f44e7917 s390: run user space and KVM guests with modified branch prediction 
[ Upstream commit 6b73044b2b ]

Define TIF_ISOLATE_BP and TIF_ISOLATE_BP_GUEST and add the necessary
plumbing in entry.S to be able to run user space and KVM guests with
limited branch prediction.

To switch a user space process to limited branch prediction the
s390_isolate_bp() function has to be call, and to run a vCPU of a KVM
guest associated with the current task with limited branch prediction
call s390_isolate_bp_guest().

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2018-04-29 11:31:59 +02:00
Martin Schwidefsky
07f65a834a s390: add options to change branch prediction behaviour for the kernel 
[ Upstream commit d768bd892f ]

Add the PPA instruction to the system entry and exit path to switch
the kernel to a different branch prediction behaviour. The instructions
are added via CPU alternatives and can be disabled with the "nospec"
or the "nobp=0" kernel parameter. If the default behaviour selected
with CONFIG_KERNEL_NOBP is set to "n" then the "nobp=1" parameter can be
used to enable the changed kernel branch prediction.

Acked-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2018-04-29 11:31:59 +02:00
Martin Schwidefsky
46bd2c0ffd s390/alternative: use a copy of the facility bit mask 
[ Upstream commit cf14899846 ]

To be able to switch off specific CPU alternatives with kernel parameters
make a copy of the facility bit mask provided by STFLE and use the copy
for the decision to apply an alternative.

Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2018-04-29 11:31:59 +02:00
Martin Schwidefsky
2dcf46aa49 s390: add optimized array_index_mask_nospec 
[ Upstream commit e2dd833389 ]

Add an optimized version of the array_index_mask_nospec function for
s390 based on a compare and a subtract with borrow.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2018-04-29 11:31:58 +02:00
Christian Borntraeger
4d9c2b611f KVM: s390: wire up bpb feature 
[ Upstream commit 35b3fde620 ]

The new firmware interfaces for branch prediction behaviour changes
are transparently available for the guest. Nevertheless, there is
new state attached that should be migrated and properly resetted.
Provide a mechanism for handling reset, migration and VSIE.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
[Changed capability number to 152. - Radim]
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2018-04-29 11:31:58 +02:00
Heiko Carstens
420fd816bd s390: enable CPU alternatives unconditionally 
[ Upstream commit 049a2c2d48 ]

Remove the CPU_ALTERNATIVES config option and enable the code
unconditionally. The config option was only added to avoid a conflict
with the named saved segment support. Since that code is gone there is
no reason to keep the CPU_ALTERNATIVES config option.

Just enable it unconditionally to also reduce the number of config
options and make it less likely that something breaks.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2018-04-29 11:31:58 +02:00
Vasily Gorbik
d69aa5e682 s390: introduce CPU alternatives 
[ Upstream commit 686140a1a9 ]

Implement CPU alternatives, which allows to optionally patch newer
instructions at runtime, based on CPU facilities availability.

A new kernel boot parameter "noaltinstr" disables patching.

Current implementation is derived from x86 alternatives. Although
ideal instructions padding (when altinstr is longer then oldinstr)
is added at compile time, and no oldinstr nops optimization has to be
done at runtime. Also couple of compile time sanity checks are done:
1. oldinstr and altinstr must be <= 254 bytes long,
2. oldinstr and altinstr must not have an odd length.

alternative(oldinstr, altinstr, facility);
alternative_2(oldinstr, altinstr1, facility1, altinstr2, facility2);

Both compile time and runtime padding consists of either 6/4/2 bytes nop
or a jump (brcl) + 2 bytes nop filler if padding is longer then 6 bytes.

.altinstructions and .altinstr_replacement sections are part of
__init_begin : __init_end region and are freed after initialization.

Signed-off-by: Vasily Gorbik <gor@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2018-04-29 11:31:58 +02:00
Greg Kroah-Hartman
9542d2a012 Merge 4.9.70 into android-4.9 
Changes in 4.9.70
	net: qmi_wwan: add Quectel BG96 2c7c:0296
	s390/qeth: fix early exit from error path
	tipc: fix memory leak in tipc_accept_from_sock()
	rds: Fix NULL pointer dereference in __rds_rdma_map
	sit: update frag_off info
	packet: fix crash in fanout_demux_rollover()
	net/packet: fix a race in packet_bind() and packet_notifier()
	usbnet: fix alignment for frames with no ethernet header
	net: remove hlist_nulls_add_tail_rcu()
	stmmac: reset last TSO segment size after device open
	tcp/dccp: block bh before arming time_wait timer
	s390/qeth: build max size GSO skbs on L2 devices
	s390/qeth: fix GSO throughput regression
	s390/qeth: fix thinko in IPv4 multicast address tracking
	tipc: call tipc_rcv() only if bearer is up in tipc_udp_recv()
	Fix handling of verdicts after NF_QUEUE
	ipmi: Stop timers before cleaning up the module
	s390: always save and restore all registers on context switch
	usb: gadget: ffs: Forbid usb_ep_alloc_request from sleeping
	fix kcm_clone()
	KVM: arm/arm64: vgic-its: Preserve the revious read from the pending table
	powerpc/64: Fix checksum folding in csum_tcpudp_nofold and ip_fast_csum_nofold
	kbuild: do not call cc-option before KBUILD_CFLAGS initialization
	ipvlan: fix ipv6 outbound device
	audit: ensure that 'audit=1' actually enables audit for PID 1
	md: free unused memory after bitmap resize
	RDMA/cxgb4: Annotate r2 and stag as __be32
	Linux 4.9.70

Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
 2017-12-18 10:58:11 +01:00
Heiko Carstens
47273f0d39 s390: always save and restore all registers on context switch 
commit fbbd7f1a51 upstream.

The switch_to() macro has an optimization to avoid saving and
restoring register contents that aren't needed for kernel threads.

There is however the possibility that a kernel thread execve's a user
space program. In such a case the execve'd process can partially see
the contents of the previous process, which shouldn't be allowed.

To avoid this, simply always save and restore register contents on
context switch.

Fixes: fdb6d070ef ("switch_to: dont restore/save access & fpu regs for kernel threads")
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2017-12-16 16:25:46 +01:00
Greg Kroah-Hartman
fdeec8fdb7 Merge 4.9.68 into android-4.9 
Changes in 4.9.68
	bcache: only permit to recovery read error when cache device is clean
	bcache: recover data from backing when data is clean
	drm/fsl-dcu: avoid disabling pixel clock twice on suspend
	drm/fsl-dcu: enable IRQ before drm_atomic_helper_resume()
	Revert "crypto: caam - get rid of tasklet"
	mm, oom_reaper: gather each vma to prevent leaking TLB entry
	uas: Always apply US_FL_NO_ATA_1X quirk to Seagate devices
	usb: quirks: Add no-lpm quirk for KY-688 USB 3.1 Type-C Hub
	serial: 8250_pci: Add Amazon PCI serial device ID
	s390/runtime instrumentation: simplify task exit handling
	USB: serial: option: add Quectel BG96 id
	ima: fix hash algorithm initialization
	s390/pci: do not require AIS facility
	selftests/x86/ldt_get: Add a few additional tests for limits
	staging: greybus: loopback: Fix iteration count on async path
	m68k: fix ColdFire node shift size calculation
	serial: 8250_fintek: Fix rs485 disablement on invalid ioctl()
	staging: rtl8188eu: avoid a null dereference on pmlmepriv
	spi: sh-msiof: Fix DMA transfer size check
	spi: spi-axi: fix potential use-after-free after deregistration
	mmc: sdhci-msm: fix issue with power irq
	usb: phy: tahvo: fix error handling in tahvo_usb_probe()
	serial: 8250: Preserve DLD[7:4] for PORT_XR17V35X
	x86/entry: Use SYSCALL_DEFINE() macros for sys_modify_ldt()
	EDAC, sb_edac: Fix missing break in switch
	sysrq : fix Show Regs call trace on ARM
	usbip: tools: Install all headers needed for libusbip development
	perf test attr: Fix ignored test case result
	kprobes/x86: Disable preemption in ftrace-based jprobes
	tools include: Do not use poison with C++
	iio: adc: ti-ads1015: add 10% to conversion wait time
	dax: Avoid page invalidation races and unnecessary radix tree traversals
	net/mlx4_en: Fix type mismatch for 32-bit systems
	l2tp: take remote address into account in l2tp_ip and l2tp_ip6 socket lookups
	dmaengine: stm32-dma: Set correct args number for DMA request from DT
	dmaengine: stm32-dma: Fix null pointer dereference in stm32_dma_tx_status
	usb: gadget: f_fs: Fix ExtCompat descriptor validation
	libcxgb: fix error check for ip6_route_output()
	net: systemport: Utilize skb_put_padto()
	net: systemport: Pad packet before inserting TSB
	ARM: OMAP2+: Fix WL1283 Bluetooth Baud Rate
	ARM: OMAP1: DMA: Correct the number of logical channels
	vti6: fix device register to report IFLA_INFO_KIND
	be2net: fix accesses to unicast list
	be2net: fix unicast list filling
	net/appletalk: Fix kernel memory disclosure
	libfs: Modify mount_pseudo_xattr to be clear it is not a userspace mount
	net: qrtr: Mark 'buf' as little endian
	mm: fix remote numa hits statistics
	mac80211: calculate min channel width correctly
	ravb: Remove Rx overflow log messages
	nfs: Don't take a reference on fl->fl_file for LOCK operation
	drm/exynos/decon5433: update shadow registers iff there are active windows
	drm/exynos/decon5433: set STANDALONE_UPDATE_F also if planes are disabled
	KVM: arm/arm64: Fix occasional warning from the timer work function
	mac80211: prevent skb/txq mismatch
	NFSv4: Fix client recovery when server reboots multiple times
	perf/x86/intel: Account interrupts for PEBS errors
	powerpc/mm: Fix memory hotplug BUG() on radix
	qla2xxx: Fix wrong IOCB type assumption
	drm/amdgpu: fix bug set incorrect value to vce register
	drm/exynos/decon5433: set STANDALONE_UPDATE_F on output enablement
	net: sctp: fix array overrun read on sctp_timer_tbl
	x86/fpu: Set the xcomp_bv when we fake up a XSAVES area
	drm/amdgpu: fix unload driver issue for virtual display
	mac80211: don't try to sleep in rate_control_rate_init()
	RDMA/qedr: Return success when not changing QP state
	RDMA/qedr: Fix RDMA CM loopback
	tipc: fix nametbl_lock soft lockup at module exit
	tipc: fix cleanup at module unload
	dmaengine: pl330: fix double lock
	tcp: correct memory barrier usage in tcp_check_space()
	i2c: i2c-cadence: Initialize configuration before probing devices
	nvmet: cancel fatal error and flush async work before free controller
	gtp: clear DF bit on GTP packet tx
	gtp: fix cross netns recv on gtp socket
	net: phy: micrel: KSZ8795 do not set SUPPORTED_[Asym_]Pause
	net: thunderx: avoid dereferencing xcv when NULL
	be2net: fix initial MAC setting
	vfio/spapr: Fix missing mutex unlock when creating a window
	mm: avoid returning VM_FAULT_RETRY from ->page_mkwrite handlers
	xen-netfront: Improve error handling during initialization
	cec: initiator should be the same as the destination for, poll
	xen-netback: vif counters from int/long to u64
	net: fec: fix multicast filtering hardware setup
	dma-buf/dma-fence: Extract __dma_fence_is_later()
	dma-buf/sw-sync: Fix the is-signaled test to handle u32 wraparound
	dma-buf/sw-sync: Prevent user overflow on timeline advance
	dma-buf/sw-sync: Reduce irqsave/irqrestore from known context
	dma-buf/sw-sync: sync_pt is private and of fixed size
	dma-buf/sw-sync: Fix locking around sync_timeline lists
	dma-buf/sw-sync: Use an rbtree to sort fences in the timeline
	dma-buf/sw_sync: move timeline_fence_ops around
	dma-buf/sw_sync: clean up list before signaling the fence
	dma-fence: Clear fence->status during dma_fence_init()
	dma-fence: Wrap querying the fence->status
	dma-fence: Introduce drm_fence_set_error() helper
	dma-buf/sw_sync: force signal all unsignaled fences on dying timeline
	dma-buf/sync_file: hold reference to fence when creating sync_file
	dma-buf: Update kerneldoc for sync_file_create
	usb: hub: Cycle HUB power when initialization fails
	usb: xhci: fix panic in xhci_free_virt_devices_depth_first
	USB: core: Add type-specific length check of BOS descriptors
	USB: Increase usbfs transfer limit
	USB: devio: Prevent integer overflow in proc_do_submiturb()
	USB: usbfs: Filter flags passed in from user space
	usb: host: fix incorrect updating of offset
	xen-netfront: avoid crashing on resume after a failure in talk_to_netback()
	Linux 4.9.68

Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
 2017-12-10 17:13:13 +01:00
Christian Borntraeger
63074a793d s390/pci: do not require AIS facility 
[ Upstream commit 48070c7305 ]

As of today QEMU does not provide the AIS facility to its guest.  This
prevents Linux guests from using PCI devices as the ais facility is
checked during init. As this is just a performance optimization, we can
move the ais check into the code where we need it (calling the SIC
instruction). This is used at initialization and on interrupt. Both
places do not require any serialization, so we can simply skip the
instruction.

Since we will now get all interrupts, we can also avoid the 2nd scan.
As we can have multiple interrupts in parallel we might trigger spurious
irqs more often for the non-AIS case but the core code can handle that.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Pierre Morel <pmorel@linux.vnet.ibm.com>
Reviewed-by: Halil Pasic <pasic@linux.vnet.ibm.com>
Acked-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2017-12-09 22:01:47 +01:00
Heiko Carstens
232b47b3c8 s390/runtime instrumentation: simplify task exit handling 
commit 8d9047f8b9 upstream.

Free data structures required for runtime instrumentation from
arch_release_task_struct(). This allows to simplify the code a bit,
and also makes the semantics a bit easier: arch_release_task_struct()
is never called from the task that is being removed.

In addition this allows to get rid of exit_thread() in a later patch.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2017-12-09 22:01:47 +01:00
Greg Kroah-Hartman
c1a286429a Merge 4.9.66 into android-4.9 
Changes in 4.9.66
	s390: fix transactional execution control register handling
	s390/runtime instrumention: fix possible memory corruption
	s390/disassembler: add missing end marker for e7 table
	s390/disassembler: increase show_code buffer size
	ACPI / EC: Fix regression related to triggering source of EC event handling
	x86/mm: fix use-after-free of vma during userfaultfd fault
	ipv6: only call ip6_route_dev_notify() once for NETDEV_UNREGISTER
	vsock: use new wait API for vsock_stream_sendmsg()
	sched: Make resched_cpu() unconditional
	lib/mpi: call cond_resched() from mpi_powm() loop
	x86/decoder: Add new TEST instruction pattern
	x86/entry/64: Add missing irqflags tracing to native_load_gs_index()
	arm64: Implement arch-specific pte_access_permitted()
	ARM: 8722/1: mm: make STRICT_KERNEL_RWX effective for LPAE
	ARM: 8721/1: mm: dump: check hardware RO bit for LPAE
	MIPS: ralink: Fix MT7628 pinmux
	MIPS: ralink: Fix typo in mt7628 pinmux function
	PCI: Set Cavium ACS capability quirk flags to assert RR/CR/SV/UF
	ALSA: hda: Add Raven PCI ID
	dm bufio: fix integer overflow when limiting maximum cache size
	dm: allocate struct mapped_device with kvzalloc
	MIPS: pci: Remove KERN_WARN instance inside the mt7620 driver
	dm: fix race between dm_get_from_kobject() and __dm_destroy()
	MIPS: Fix odd fp register warnings with MIPS64r2
	MIPS: dts: remove bogus bcm96358nb4ser.dtb from dtb-y entry
	MIPS: Fix an n32 core file generation regset support regression
	MIPS: BCM47XX: Fix LED inversion for WRT54GSv1
	rt2x00usb: mark device removed when get ENOENT usb error
	autofs: don't fail mount for transient error
	nilfs2: fix race condition that causes file system corruption
	eCryptfs: use after free in ecryptfs_release_messaging()
	libceph: don't WARN() if user tries to add invalid key
	bcache: check ca->alloc_thread initialized before wake up it
	isofs: fix timestamps beyond 2027
	NFS: Fix typo in nomigration mount option
	nfs: Fix ugly referral attributes
	NFS: Avoid RCU usage in tracepoints
	nfsd: deal with revoked delegations appropriately
	rtlwifi: rtl8192ee: Fix memory leak when loading firmware
	rtlwifi: fix uninitialized rtlhal->last_suspend_sec time
	ata: fixes kernel crash while tracing ata_eh_link_autopsy event
	ext4: fix interaction between i_size, fallocate, and delalloc after a crash
	ALSA: pcm: update tstamp only if audio_tstamp changed
	ALSA: usb-audio: Add sanity checks to FE parser
	ALSA: usb-audio: Fix potential out-of-bound access at parsing SU
	ALSA: usb-audio: Add sanity checks in v2 clock parsers
	ALSA: timer: Remove kernel warning at compat ioctl error paths
	ALSA: hda: Fix too short HDMI/DP chmap reporting
	ALSA: hda/realtek - Fix ALC700 family no sound issue
	fix a page leak in vhost_scsi_iov_to_sgl() error recovery
	fs/9p: Compare qid.path in v9fs_test_inode
	iscsi-target: Fix non-immediate TMR reference leak
	target: Fix QUEUE_FULL + SCSI task attribute handling
	mtd: nand: omap2: Fix subpage write
	mtd: nand: Fix writing mtdoops to nand flash.
	mtd: nand: mtk: fix infinite ECC decode IRQ issue
	p54: don't unregister leds when they are not initialized
	block: Fix a race between blk_cleanup_queue() and timeout handling
	irqchip/gic-v3: Fix ppi-partitions lookup
	lockd: double unregister of inetaddr notifiers
	KVM: nVMX: set IDTR and GDTR limits when loading L1 host state
	KVM: SVM: obey guest PAT
	SUNRPC: Fix tracepoint storage issues with svc_recv and svc_rqst_status
	clk: ti: dra7-atl-clock: fix child-node lookups
	libnvdimm, pfn: make 'resource' attribute only readable by root
	libnvdimm, namespace: fix label initialization to use valid seq numbers
	libnvdimm, namespace: make 'resource' attribute only readable by root
	IB/srpt: Do not accept invalid initiator port names
	IB/srp: Avoid that a cable pull can trigger a kernel crash
	NFC: fix device-allocation error return
	i40e: Use smp_rmb rather than read_barrier_depends
	igb: Use smp_rmb rather than read_barrier_depends
	igbvf: Use smp_rmb rather than read_barrier_depends
	ixgbevf: Use smp_rmb rather than read_barrier_depends
	i40evf: Use smp_rmb rather than read_barrier_depends
	fm10k: Use smp_rmb rather than read_barrier_depends
	ixgbe: Fix skb list corruption on Power systems
	parisc: Fix validity check of pointer size argument in new CAS implementation
	powerpc/signal: Properly handle return value from uprobe_deny_signal()
	media: Don't do DMA on stack for firmware upload in the AS102 driver
	media: rc: check for integer overflow
	cx231xx-cards: fix NULL-deref on missing association descriptor
	media: v4l2-ctrl: Fix flags field on Control events
	sched/rt: Simplify the IPI based RT balancing logic
	fscrypt: lock mutex before checking for bounce page pool
	net/9p: Switch to wait_event_killable()
	PM / OPP: Add missing of_node_put(np)
	Revert "drm/i915: Do not rely on wm preservation for ILK watermarks"
	e1000e: Fix error path in link detection
	e1000e: Fix return value test
	e1000e: Separate signaling for link check/link up
	e1000e: Avoid receiver overrun interrupt bursts
	RDS: make message size limit compliant with spec
	RDS: RDMA: return appropriate error on rdma map failures
	RDS: RDMA: fix the ib_map_mr_sg_zbva() argument
	PCI: Apply _HPX settings only to relevant devices
	drm/sun4i: Fix a return value in case of error
	clk: sunxi-ng: A31: Fix spdif clock register
	clk: sunxi-ng: fix PLL_CPUX adjusting on A33
	dmaengine: zx: set DMA_CYCLIC cap_mask bit
	fscrypt: use ENOKEY when file cannot be created w/o key
	fscrypt: use ENOTDIR when setting encryption policy on nondirectory
	net: Allow IP_MULTICAST_IF to set index to L3 slave
	net: 3com: typhoon: typhoon_init_one: make return values more specific
	net: 3com: typhoon: typhoon_init_one: fix incorrect return values
	drm/armada: Fix compile fail
	rt2800: set minimum MPDU and PSDU lengths to sane values
	adm80211: return an error if adm8211_alloc_rings() fails
	mwifiex: sdio: fix use after free issue for save_adapter
	ath10k: fix incorrect txpower set by P2P_DEVICE interface
	ath10k: ignore configuring the incorrect board_id
	ath10k: fix potential memory leak in ath10k_wmi_tlv_op_pull_fw_stats()
	pinctrl: sirf: atlas7: Add missing 'of_node_put()'
	bnxt_en: Set default completion ring for async events.
	ath10k: set CTS protection VDEV param only if VDEV is up
	ALSA: hda - Apply ALC269_FIXUP_NO_SHUTUP on HDA_FIXUP_ACT_PROBE
	gpio: mockup: dynamically allocate memory for chip name
	drm: Apply range restriction after color adjustment when allocation
	clk: qcom: ipq4019: Add all the frequencies for apss cpu
	drm/mediatek: don't use drm_put_dev
	mac80211: Remove invalid flag operations in mesh TSF synchronization
	mac80211: Suppress NEW_PEER_CANDIDATE event if no room
	adm80211: add checks for dma mapping errors
	iio: light: fix improper return value
	staging: iio: cdc: fix improper return value
	spi: SPI_FSL_DSPI should depend on HAS_DMA
	netfilter: nft_queue: use raw_smp_processor_id()
	netfilter: nf_tables: fix oob access
	ASoC: rsnd: don't double free kctrl
	crypto: marvell - Copy IVDIG before launching partial DMA ahash requests
	btrfs: return the actual error value from from btrfs_uuid_tree_iterate
	ASoC: wm_adsp: Don't overrun firmware file buffer when reading region data
	s390/kbuild: enable modversions for symbols exported from asm
	cec: when canceling a message, don't overwrite old status info
	cec: CEC_MSG_GIVE_FEATURES should abort for CEC version < 2
	cec: update log_addr[] before finishing configuration
	nvmet: fix KATO offset in Set Features
	xen: xenbus driver must not accept invalid transaction ids
	Linux 4.9.66

Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
 2017-11-30 16:24:14 +00:00
Heiko Carstens
6c5bac3d6c s390/kbuild: enable modversions for symbols exported from asm 
[ Upstream commit cabab3f9f5 ]

s390 version of commit 334bb77387 ("x86/kbuild: enable modversions
for symbols exported from asm") so we get also rid of all these
warnings:

WARNING: EXPORT symbol "_mcount" [vmlinux] version generation failed, symbol will not be versioned.
WARNING: EXPORT symbol "memcpy" [vmlinux] version generation failed, symbol will not be versioned.
WARNING: EXPORT symbol "memmove" [vmlinux] version generation failed, symbol will not be versioned.
WARNING: EXPORT symbol "memset" [vmlinux] version generation failed, symbol will not be versioned.
WARNING: EXPORT symbol "save_fpu_regs" [vmlinux] version generation failed, symbol will not be versioned.
WARNING: EXPORT symbol "sie64a" [vmlinux] version generation failed, symbol will not be versioned.
WARNING: EXPORT symbol "sie_exit" [vmlinux] version generation failed, symbol will not be versioned.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2017-11-30 08:39:14 +00:00
Heiko Carstens
c9d0db615c s390: fix transactional execution control register handling 
commit a1c5befc1c upstream.

Dan Horák reported the following crash related to transactional execution:

User process fault: interruption code 0013 ilc:3 in libpthread-2.26.so[3ff93c00000+1b000]
CPU: 2 PID: 1 Comm: /init Not tainted 4.13.4-300.fc27.s390x #1
Hardware name: IBM 2827 H43 400 (z/VM 6.4.0)
task: 00000000fafc8000 task.stack: 00000000fafc4000
User PSW : 0705200180000000 000003ff93c14e70
           R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:1 AS:0 CC:2 PM:0 RI:0 EA:3
User GPRS: 0000000000000077 000003ff00000000 000003ff93144d48 000003ff93144d5e
           0000000000000000 0000000000000002 0000000000000000 000003ff00000000
           0000000000000000 0000000000000418 0000000000000000 000003ffcc9fe770
           000003ff93d28f50 000003ff9310acf0 000003ff92b0319a 000003ffcc9fe6d0
User Code: 000003ff93c14e62: 60e0b030            std     %f14,48(%r11)
           000003ff93c14e66: 60f0b038            std     %f15,56(%r11)
          #000003ff93c14e6a: e5600000ff0e        tbegin  0,65294
          >000003ff93c14e70: a7740006            brc     7,3ff93c14e7c
           000003ff93c14e74: a7080000            lhi     %r0,0
           000003ff93c14e78: a7f40023            brc     15,3ff93c14ebe
           000003ff93c14e7c: b2220000            ipm     %r0
           000003ff93c14e80: 8800001c            srl     %r0,28

There are several bugs with control register handling with respect to
transactional execution:

- on task switch update_per_regs() is only called if the next task has
  an mm (is not a kernel thread). This however is incorrect. This
  breaks e.g. for user mode helper handling, where the kernel creates
  a kernel thread and then execve's a user space program. Control
  register contents related to transactional execution won't be
  updated on execve. If the previous task ran with transactional
  execution disabled then the new task will also run with
  transactional execution disabled, which is incorrect. Therefore call
  update_per_regs() unconditionally within switch_to().

- on startup the transactional execution facility is not enabled for
  the idle thread. This is not really a bug, but an inconsistency to
  other facilities. Therefore enable the facility if it is available.

- on fork the new thread's per_flags field is not cleared. This means
  that a child process inherits the PER_FLAG_NO_TE flag. This flag can
  be set with a ptrace request to disable transactional execution for
  the current process. It should not be inherited by new child
  processes in order to be consistent with the handling of all other
  PER related debugging options. Therefore clear the per_flags field in
  copy_thread_tls().

Reported-and-tested-by: Dan Horák <dan@danny.cz>
Fixes: d35339a42d ("s390: add support for transactional memory")
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2017-11-30 08:39:00 +00:00
Greg Kroah-Hartman
e5eba30388 Merge 4.9.54 into android-4.9 
Changes in 4.9.54
	drm_fourcc: Fix DRM_FORMAT_MOD_LINEAR #define
	drm: bridge: add DT bindings for TI ths8135
	GFS2: Fix reference to ERR_PTR in gfs2_glock_iter_next
	drm/i915: Fix the overlay frontbuffer tracking
	ARM: dts: exynos: Add CPU OPPs for Exynos4412 Prime
	clk: sunxi-ng: fix PLL_CPUX adjusting on H3
	RDS: RDMA: Fix the composite message user notification
	ARM: dts: r8a7790: Use R-Car Gen 2 fallback binding for msiof nodes
	MIPS: Ensure bss section ends on a long-aligned address
	MIPS: ralink: Fix a typo in the pinmux setup.
	MIPS: ralink: Fix incorrect assignment on ralink_soc
	power: supply: axp288_fuel_gauge: Fix fuel_gauge_reg_readb return on error
	scsi: be2iscsi: Add checks to validate CID alloc/free
	ARM: dts: am335x-chilisom: Wakeup from RTC-only state by power on event
	igb: re-assign hw address pointer on reset after PCI error
	extcon: axp288: Use vbus-valid instead of -present to determine cable presence
	reset: ti_syscon: fix a ti_syscon_reset_status issue
	sh_eth: use correct name for ECMR_MPDE bit
	clk/axs10x: Clear init field in driver probe
	usb: make the MTK XHCI driver compile for older MIPS SoCs
	hwmon: (gl520sm) Fix overflows and crash seen when writing into limit attributes
	iio: adc: imx25-gcq: Fix module autoload
	iio: adc: axp288: Drop bogus AXP288_ADC_TS_PIN_CTRL register modifications
	iio: adc: hx711: Add DT binding for avia,hx711
	IB/rxe: Add a runtime check in alloc_index()
	IB/rxe: Fix a MR reference leak in check_rkey()
	ARM: 8635/1: nommu: allow enabling REMAP_VECTORS_TO_RAM
	drm/i915/psr: disable psr2 for resolution greater than 32X20
	serial: 8250: moxa: Store num_ports in brd
	tty: goldfish: Fix a parameter of a call to free_irq
	serial: 8250_port: Remove dangerous pr_debug()
	IB/ipoib: Fix deadlock over vlan_mutex
	IB/ipoib: rtnl_unlock can not come after free_netdev
	IB/ipoib: Replace list_del of the neigh->list with list_del_init
	arm: dts: mt2701: Add subsystem clock controller device nodes
	drm/amdkfd: fix improper return value on error
	USB: serial: mos7720: fix control-message error handling
	USB: serial: mos7840: fix control-message error handling
	sfc: get PIO buffer size from the NIC
	partitions/efi: Fix integer overflow in GPT size calculation
	ASoC: dapm: handle probe deferrals
	audit: log 32-bit socketcalls
	ath10k: prevent sta pointer rcu violation
	spi: pxa2xx: Add support for Intel Gemini Lake
	iommu/arm-smmu: Set privileged attribute to 'default' instead of 'unprivileged'
	usb: chipidea: vbus event may exist before starting gadget
	rtl8xxxu: Add additional USB IDs for rtl8192eu devices
	ASoC: dapm: fix some pointer error handling
	drm: mali-dp: Fix destination size handling when rotating
	drm: mali-dp: Fix transposed horizontal/vertical flip
	HID: wacom: release the resources before leaving despite devm
	MIPS: Lantiq: Fix another request_mem_region() return code check
	mips: ath79: clock:- Unmap region obtained by of_iomap
	lkdtm: Fix Oops when unloading the module
	net: core: Prevent from dereferencing null pointer when releasing SKB
	net/packet: check length in getsockopt() called with PACKET_HDRLEN
	team: fix memory leaks
	usb: plusb: Add support for PL-27A1
	udp: disable inner UDP checksum offloads in IPsec case
	net: dsa: b53: Include IMP/CPU port in dumb forwarding mode
	qed: Fix possible system hang in the dcbnl-getdcbx() path.
	mmc: sdio: fix alignment issue in struct sdio_func
	bridge: netlink: register netdevice before executing changelink
	Btrfs: fix segmentation fault when doing dio read
	Btrfs: fix potential use-after-free for cloned bio
	sata_via: Enable hotplug only on VT6421
	hugetlbfs: initialize shared policy as part of inode allocation
	kasan: do not sanitize kexec purgatory
	drivers/rapidio/devices/tsi721.c: make module parameter variable name unique
	netfilter: invoke synchronize_rcu after set the _hook_ to NULL
	MIPS: IRQ Stack: Unwind IRQ stack onto task stack
	iommu/exynos: Block SYSMMU while invalidating FLPD cache
	exynos-gsc: Do not swap cb/cr for semi planar formats
	MIPS: smp-cps: Fix retrieval of VPE mask on big endian CPUs
	nvme-rdma: handle cpu unplug when re-establishing the controller
	netfilter: nfnl_cthelper: fix incorrect helper->expect_class_max
	parisc: perf: Fix potential NULL pointer dereference
	nfs: make nfs4_cb_sv_ops static
	ibmvnic: Free tx/rx scrq pointer array when releasing sub-crqs
	cpufreq: intel_pstate: Update pid_params.sample_rate_ns in pid_param_set()
	x86/acpi: Restore the order of CPU IDs
	iommu/io-pgtable-arm: Check for leaf entry before dereferencing it
	mm/cgroup: avoid panic when init with low memory
	rds: ib: add error handle
	md/raid10: submit bio directly to replacement disk
	netfilter: nf_tables: set pktinfo->thoff at AH header if found
	i2c: meson: fix wrong variable usage in meson_i2c_put_data
	xfs: remove kmem_zalloc_greedy
	ASoC: wm_adsp: Return an error on write to a disabled volatile control
	libata: transport: Remove circular dependency at free time
	ARM: dts: BCM5301X: Fix memory start address
	tools/power turbostat: bugfix: GFXMHz column not changing
	IB/qib: fix false-postive maybe-uninitialized warning
	ARM: remove duplicate 'const' annotations'
	ASoC: rt5514: fix gcc-7 warning
	ASoC: rt5659: drop double const
	ASoC: rt5660: remove double const
	ALSA: au88x0: avoid theoretical uninitialized access
	ttpci: address stringop overflow warning
	s390/mm: make pmdp_invalidate() do invalidation only
	Linux 4.9.54

Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
 2017-10-08 10:49:06 +02:00
Gerald Schaefer
75903d40aa s390/mm: make pmdp_invalidate() do invalidation only 
commit 91c575b335 upstream.

Commit 227be799c3 ("s390/mm: uninline pmdp_xxx functions from pgtable.h")
inadvertently changed the behavior of pmdp_invalidate(), so that it now
clears the pmd instead of just marking it as invalid. Fix this by restoring
the original behavior.

A possible impact of the misbehaving pmdp_invalidate() would be the
MADV_DONTNEED races (see commits ced10803 and 58ceeb6b), although we
should not have any negative impact on the related dirty/young flags,
since those flags are not set by the hardware on s390.

Fixes: 227be799c3 ("s390/mm: uninline pmdp_xxx functions from pgtable.h")
Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2017-10-08 10:26:12 +02:00
Greg Kroah-Hartman
c30c69c76c Merge 4.9.52 into android-4.9 
Changes in 4.9.52
	SUNRPC: Refactor svc_set_num_threads()
	NFSv4: Fix callback server shutdown
	mm: prevent double decrease of nr_reserved_highatomic
	orangefs: Don't clear SGID when inheriting ACLs
	IB/{qib, hfi1}: Avoid flow control testing for RDMA write operation
	drm/sun4i: Implement drm_driver lastclose to restore fbdev console
	IB/addr: Fix setting source address in addr6_resolve()
	tty: improve tty_insert_flip_char() fast path
	tty: improve tty_insert_flip_char() slow path
	tty: fix __tty_insert_flip_char regression
	pinctrl/amd: save pin registers over suspend/resume
	Input: i8042 - add Gigabyte P57 to the keyboard reset table
	MIPS: math-emu: <MAX|MAXA|MIN|MINA>.<D|S>: Fix quiet NaN propagation
	MIPS: math-emu: <MAX|MAXA|MIN|MINA>.<D|S>: Fix cases of both inputs zero
	MIPS: math-emu: <MAX|MIN>.<D|S>: Fix cases of both inputs negative
	MIPS: math-emu: <MAXA|MINA>.<D|S>: Fix cases of input values with opposite signs
	MIPS: math-emu: <MAXA|MINA>.<D|S>: Fix cases of both infinite inputs
	MIPS: math-emu: MINA.<D|S>: Fix some cases of infinity and zero inputs
	MIPS: math-emu: Handle zero accumulator case in MADDF and MSUBF separately
	MIPS: math-emu: <MADDF|MSUBF>.<D|S>: Fix NaN propagation
	MIPS: math-emu: <MADDF|MSUBF>.<D|S>: Fix some cases of infinite inputs
	MIPS: math-emu: <MADDF|MSUBF>.<D|S>: Fix some cases of zero inputs
	MIPS: math-emu: <MADDF|MSUBF>.<D|S>: Clean up "maddf_flags" enumeration
	MIPS: math-emu: <MADDF|MSUBF>.S: Fix accuracy (32-bit case)
	MIPS: math-emu: <MADDF|MSUBF>.D: Fix accuracy (64-bit case)
	crypto: ccp - Fix XTS-AES-128 support on v5 CCPs
	crypto: AF_ALG - remove SGL terminator indicator when chaining
	ext4: fix incorrect quotaoff if the quota feature is enabled
	ext4: fix quota inconsistency during orphan cleanup for read-only mounts
	powerpc: Fix DAR reporting when alignment handler faults
	block: Relax a check in blk_start_queue()
	md/bitmap: disable bitmap_resize for file-backed bitmaps.
	skd: Avoid that module unloading triggers a use-after-free
	skd: Submit requests to firmware before triggering the doorbell
	scsi: zfcp: fix queuecommand for scsi_eh commands when DIX enabled
	scsi: zfcp: add handling for FCP_RESID_OVER to the fcp ingress path
	scsi: zfcp: fix capping of unsuccessful GPN_FT SAN response trace records
	scsi: zfcp: fix passing fsf_req to SCSI trace on TMF to correlate with HBA
	scsi: zfcp: fix missing trace records for early returns in TMF eh handlers
	scsi: zfcp: fix payload with full FCP_RSP IU in SCSI trace records
	scsi: zfcp: trace HBA FSF response by default on dismiss or timedout late response
	scsi: zfcp: trace high part of "new" 64 bit SCSI LUN
	scsi: megaraid_sas: set minimum value of resetwaittime to be 1 secs
	scsi: megaraid_sas: Check valid aen class range to avoid kernel panic
	scsi: megaraid_sas: Return pended IOCTLs with cmd_status MFI_STAT_WRONG_STATE in case adapter is dead
	scsi: storvsc: fix memory leak on ring buffer busy
	scsi: sg: remove 'save_scat_len'
	scsi: sg: use standard lists for sg_requests
	scsi: sg: off by one in sg_ioctl()
	scsi: sg: factor out sg_fill_request_table()
	scsi: sg: fixup infoleak when using SG_GET_REQUEST_TABLE
	scsi: qla2xxx: Correction to vha->vref_count timeout
	scsi: qla2xxx: Fix an integer overflow in sysfs code
	ftrace: Fix selftest goto location on error
	ftrace: Fix memleak when unregistering dynamic ops when tracing disabled
	tracing: Add barrier to trace_printk() buffer nesting modification
	tracing: Apply trace_clock changes to instance max buffer
	ARC: Re-enable MMU upon Machine Check exception
	PCI: shpchp: Enable bridge bus mastering if MSI is enabled
	PCI: pciehp: Report power fault only once until we clear it
	net/netfilter/nf_conntrack_core: Fix net_conntrack_lock()
	s390/mm: fix local TLB flushing vs. detach of an mm address space
	s390/mm: fix race on mm->context.flush_mm
	media: v4l2-compat-ioctl32: Fix timespec conversion
	media: uvcvideo: Prevent heap overflow when accessing mapped controls
	PM / devfreq: Fix memory leak when fail to register device
	bcache: initialize dirty stripes in flash_dev_run()
	bcache: Fix leak of bdev reference
	bcache: do not subtract sectors_to_gc for bypassed IO
	bcache: correct cache_dirty_target in __update_writeback_rate()
	bcache: Correct return value for sysfs attach errors
	bcache: fix for gc and write-back race
	bcache: fix bch_hprint crash and improve output
	Linux 4.9.52

Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
 2017-09-27 14:56:06 +02:00
Martin Schwidefsky
de4360dd35 s390/mm: fix race on mm->context.flush_mm 
commit 60f07c8ec5 upstream.

The order in __tlb_flush_mm_lazy is to flush TLB first and then clear
the mm->context.flush_mm bit. This can lead to missed flushes as the
bit can be set anytime, the order needs to be the other way aronud.

But this leads to a different race, __tlb_flush_mm_lazy may be called
on two CPUs concurrently. If mm->context.flush_mm is cleared first then
another CPU can bypass __tlb_flush_mm_lazy although the first CPU has
not done the flush yet. In a virtualized environment the time until the
flush is finally completed can be arbitrarily long.

Add a spinlock to serialize __tlb_flush_mm_lazy and use the function
in finish_arch_post_lock_switch as well.

Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2017-09-27 14:39:24 +02:00
Martin Schwidefsky
536ab630f4 s390/mm: fix local TLB flushing vs. detach of an mm address space 
commit b3e5dc45fd upstream.

The local TLB flushing code keeps an additional mask in the mm.context,
the cpu_attach_mask. At the time a global flush of an address space is
done the cpu_attach_mask is copied to the mm_cpumask in order to avoid
future global flushes in case the mm is used by a single CPU only after
the flush.

Trouble is that the reset of the mm_cpumask is racy against the detach
of an mm address space by switch_mm. The current order is first the
global TLB flush and then the copy of the cpu_attach_mask to the
mm_cpumask. The order needs to be the other way around.

Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2017-09-27 14:39:24 +02:00
Greg Kroah-Hartman
5316da5fec Merge 4.9.49 into android-4.9 
Changes in 4.9.49
	usb: quirks: add delay init quirk for Corsair Strafe RGB keyboard
	USB: serial: option: add support for D-Link DWM-157 C1
	usb: Add device quirk for Logitech HD Pro Webcam C920-C
	usb:xhci:Fix regression when ATI chipsets detected
	USB: musb: fix external abort on suspend
	USB: core: Avoid race of async_completed() w/ usbdev_release()
	staging/rts5208: fix incorrect shift to extract upper nybble
	iio: adc: ti-ads1015: fix incorrect data rate setting update
	iio: adc: ti-ads1015: fix scale information for ADS1115
	iio: adc: ti-ads1015: enable conversion when CONFIG_PM is not set
	iio: adc: ti-ads1015: avoid getting stale result after runtime resume
	iio: adc: ti-ads1015: don't return invalid value from buffer setup callbacks
	iio: adc: ti-ads1015: add adequate wait time to get correct conversion
	driver core: bus: Fix a potential double free
	intel_th: pci: Add Cannon Lake PCH-H support
	intel_th: pci: Add Cannon Lake PCH-LP support
	ath10k: fix memory leak in rx ring buffer allocation
	Input: trackpoint - assume 3 buttons when buttons detection fails
	rtlwifi: rtl_pci_probe: Fix fail path of _rtl_pci_find_adapter
	Bluetooth: Add support of 13d3:3494 RTL8723BE device
	iwlwifi: pci: add new PCI ID for 7265D
	dlm: avoid double-free on error path in dlm_device_{register,unregister}
	mwifiex: correct channel stat buffer overflows
	MCB: add support for SC31 to mcb-lpc
	s390/mm: avoid empty zero pages for KVM guests to avoid postcopy hangs
	drm/nouveau/pci/msi: disable MSI on big-endian platforms by default
	workqueue: Fix flag collision
	cs5536: add support for IDE controller variant
	scsi: sg: protect against races between mmap() and SG_SET_RESERVED_SIZE
	scsi: sg: recheck MMAP_IO request length with lock held
	drm/bridge: adv7511: Use work_struct to defer hotplug handing to out of irq context
	drm/bridge: adv7511: Switch to using drm_kms_helper_hotplug_event()
	Linux 4.9.49

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2017-09-11 08:40:40 -07:00
Christian Borntraeger
078866740e s390/mm: avoid empty zero pages for KVM guests to avoid postcopy hangs 
commit fa41ba0d08 upstream.

Right now there is a potential hang situation for postcopy migrations,
if the guest is enabling storage keys on the target system during the
postcopy process.

For storage key virtualization, we have to forbid the empty zero page as
the storage key is a property of the physical page frame.  As we enable
storage key handling lazily we then drop all mappings for empty zero
pages for lazy refaulting later on.

This does not work with the postcopy migration, which relies on the
empty zero page never triggering a fault again in the future. The reason
is that postcopy migration will simply read a page on the target system
if that page is a known zero page to fault in an empty zero page.  At
the same time postcopy remembers that this page was already transferred
- so any future userfault on that page will NOT be retransmitted again
to avoid races.

If now the guest enters the storage key mode while in postcopy, we will
break this assumption of postcopy.

The solution is to disable the empty zero page for KVM guests early on
and not during storage key enablement. With this change, the postcopy
migration process is guaranteed to start after no zero pages are left.

As guest pages are very likely not empty zero pages anyway the memory
overhead is also pretty small.

While at it this also adds proper page table locking to the zero page
removal.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Acked-by: Janosch Frank <frankja@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2017-09-09 17:39:41 +02:00
Greg Kroah-Hartman
9ae2c670d8 Merge 4.9.40 into android-4.9 
Changes in 4.9.40
	disable new gcc-7.1.1 warnings for now
	ir-core: fix gcc-7 warning on bool arithmetic
	dm mpath: cleanup -Wbool-operation warning in choose_pgpath()
	s5p-jpeg: don't return a random width/height
	thermal: max77620: fix device-node reference imbalance
	thermal: cpu_cooling: Avoid accessing potentially freed structures
	ath9k: fix tx99 use after free
	ath9k: fix tx99 bus error
	ath9k: fix an invalid pointer dereference in ath9k_rng_stop()
	NFC: fix broken device allocation
	NFC: nfcmrvl_uart: add missing tty-device sanity check
	NFC: nfcmrvl: do not use device-managed resources
	NFC: nfcmrvl: use nfc-device for firmware download
	NFC: nfcmrvl: fix firmware-management initialisation
	nfc: Ensure presence of required attributes in the activate_target handler
	nfc: Fix the sockaddr length sanitization in llcp_sock_connect
	NFC: Add sockaddr length checks before accessing sa_family in bind handlers
	perf intel-pt: Move decoder error setting into one condition
	perf intel-pt: Improve sample timestamp
	perf intel-pt: Fix missing stack clear
	perf intel-pt: Ensure IP is zero when state is INTEL_PT_STATE_NO_IP
	perf intel-pt: Fix last_ip usage
	perf intel-pt: Ensure never to set 'last_ip' when packet 'count' is zero
	perf intel-pt: Use FUP always when scanning for an IP
	perf intel-pt: Clear FUP flag on error
	Bluetooth: use constant time memory comparison for secret values
	wlcore: fix 64K page support
	btrfs: Don't clear SGID when inheriting ACLs
	igb: Explicitly select page 0 at initialization
	ASoC: compress: Derive substream from stream based on direction
	PM / Domains: Fix unsafe iteration over modified list of device links
	PM / Domains: Fix unsafe iteration over modified list of domain providers
	PM / Domains: Fix unsafe iteration over modified list of domains
	scsi: ses: do not add a device to an enclosure if enclosure_add_links() fails.
	scsi: Add STARGET_CREATED_REMOVE state to scsi_target_state
	iscsi-target: Add login_keys_workaround attribute for non RFC initiators
	xen/scsiback: Fix a TMR related use-after-free
	powerpc/pseries: Fix passing of pp0 in updatepp() and updateboltedpp()
	powerpc/64: Fix atomic64_inc_not_zero() to return an int
	powerpc: Fix emulation of mcrf in emulate_step()
	powerpc: Fix emulation of mfocrf in emulate_step()
	powerpc/asm: Mark cr0 as clobbered in mftb()
	powerpc/mm/radix: Properly clear process table entry
	af_key: Fix sadb_x_ipsecrequest parsing
	PCI: Work around poweroff & suspend-to-RAM issue on Macbook Pro 11
	PCI: rockchip: Use normal register bank for config accessors
	PCI/PM: Restore the status of PCI devices across hibernation
	ipvs: SNAT packet replies only for NATed connections
	xhci: fix 20000ms port resume timeout
	xhci: Fix NULL pointer dereference when cleaning up streams for removed host
	xhci: Bad Ethernet performance plugged in ASM1042A host
	mxl111sf: Fix driver to use heap allocate buffers for USB messages
	usb: storage: return on error to avoid a null pointer dereference
	USB: cdc-acm: add device-id for quirky printer
	usb: renesas_usbhs: fix usbhsc_resume() for !USBHSF_RUNTIME_PWCTRL
	usb: renesas_usbhs: gadget: disable all eps when the driver stops
	md: don't use flush_signals in userspace processes
	x86/xen: allow userspace access during hypercalls
	cx88: Fix regression in initial video standard setting
	libnvdimm, btt: fix btt_rw_page not returning errors
	libnvdimm: fix badblock range handling of ARS range
	ext2: Don't clear SGID when inheriting ACLs
	Raid5 should update rdev->sectors after reshape
	s390/syscalls: Fix out of bounds arguments access
	drm/amd/amdgpu: Return error if initiating read out of range on vram
	drm/radeon/ci: disable mclk switching for high refresh rates (v2)
	drm/radeon: Fix eDP for single-display iMac10,1 (v2)
	ipmi: use rcu lock around call to intf->handlers->sender()
	ipmi:ssif: Add missing unlock in error branch
	xfs: Don't clear SGID when inheriting ACLs
	f2fs: sanity check size of nat and sit cache
	f2fs: Don't clear SGID when inheriting ACLs
	drm/ttm: Fix use-after-free in ttm_bo_clean_mm
	ovl: drop CAP_SYS_RESOURCE from saved mounter's credentials
	vfio: Fix group release deadlock
	vfio: New external user group/file match
	nvme-rdma: remove race conditions from IB signalling
	ftrace: Fix uninitialized variable in match_records()
	MIPS: Fix mips_atomic_set() retry condition
	MIPS: Fix mips_atomic_set() with EVA
	MIPS: Negate error syscall return in trace
	ubifs: Don't leak kernel memory to the MTD
	ACPI / EC: Drop EC noirq hooks to fix a regression
	Revert "ACPI / EC: Enable event freeze mode..." to fix a regression
	x86/acpi: Prevent out of bound access caused by broken ACPI tables
	x86/ioapic: Pass the correct data to unmask_ioapic_irq()
	MIPS: Fix MIPS I ISA /proc/cpuinfo reporting
	MIPS: Save static registers before sysmips
	MIPS: Actually decode JALX in `__compute_return_epc_for_insn'
	MIPS: Fix unaligned PC interpretation in `compute_return_epc'
	MIPS: math-emu: Prevent wrong ISA mode instruction emulation
	MIPS: Send SIGILL for BPOSGE32 in `__compute_return_epc_for_insn'
	MIPS: Rename `sigill_r6' to `sigill_r2r6' in `__compute_return_epc_for_insn'
	MIPS: Send SIGILL for linked branches in `__compute_return_epc_for_insn'
	MIPS: Send SIGILL for R6 branches in `__compute_return_epc_for_insn'
	MIPS: Fix a typo: s/preset/present/ in r2-to-r6 emulation error message
	Input: i8042 - fix crash at boot time
	IB/iser: Fix connection teardown race condition
	IB/core: Namespace is mandatory input for address resolution
	sunrpc: use constant time memory comparison for mac
	NFS: only invalidate dentrys that are clearly invalid.
	udf: Fix deadlock between writeback and udf_setsize()
	target: Fix COMPARE_AND_WRITE caw_sem leak during se_cmd quiesce
	iser-target: Avoid isert_conn->cm_id dereference in isert_login_recv_done
	perf annotate: Fix broken arrow at row 0 connecting jmp instruction to its target
	Revert "perf/core: Drop kernel samples even though :u is specified"
	staging: rtl8188eu: add TL-WN722N v2 support
	staging: comedi: ni_mio_common: fix AO timer off-by-one regression
	staging: sm750fb: avoid conflicting vesafb
	staging: lustre: ko2iblnd: check copy_from_iter/copy_to_iter return code
	ceph: fix race in concurrent readdir
	RDMA/core: Initialize port_num in qp_attr
	drm/mst: Fix error handling during MST sideband message reception
	drm/mst: Avoid dereferencing a NULL mstb in drm_dp_mst_handle_up_req()
	drm/mst: Avoid processing partially received up/down message transactions
	mlx5: Avoid that mlx5_ib_sg_to_klms() overflows the klms[] array
	hfsplus: Don't clear SGID when inheriting ACLs
	ovl: fix random return value on mount
	acpi/nfit: Fix memory corruption/Unregister mce decoder on failure
	of: device: Export of_device_{get_modalias, uvent_modalias} to modules
	spmi: Include OF based modalias in device uevent
	reiserfs: Don't clear SGID when inheriting ACLs
	PM / Domains: defer dev_pm_domain_set() until genpd->attach_dev succeeds if present
	tracing: Fix kmemleak in instance_rmdir
	alarmtimer: don't rate limit one-shot timers
	Linux 4.9.40

Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
 2017-07-27 15:24:43 -07:00
Jiri Olsa
8302e9d2f5 s390/syscalls: Fix out of bounds arguments access 
commit c46fc0424c upstream.

Zorro reported following crash while having enabled
syscall tracing (CONFIG_FTRACE_SYSCALLS):

  Unable to handle kernel pointer dereference at virtual ...
  Oops: 0011 [#1] SMP DEBUG_PAGEALLOC

  SNIP

  Call Trace:
  ([<000000000024d79c>] ftrace_syscall_enter+0xec/0x1d8)
   [<00000000001099c6>] do_syscall_trace_enter+0x236/0x2f8
   [<0000000000730f1c>] sysc_tracesys+0x1a/0x32
   [<000003fffcf946a2>] 0x3fffcf946a2
  INFO: lockdep is turned off.
  Last Breaking-Event-Address:
   [<000000000022dd44>] rb_event_data+0x34/0x40
  ---[ end trace 8c795f86b1b3f7b9 ]---

The crash happens in syscall_get_arguments function for
syscalls with zero arguments, that will try to access
first argument (args[0]) in event entry, but it's not
allocated.

Bail out of there are no arguments.

Reported-by: Zorro Lang <zlang@redhat.com>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2017-07-27 15:08:02 -07:00
Greg Kroah-Hartman
14accea70e Merge 4.9.39 into android-4.9 
Changes in 4.9.39
	xen-netfront: Rework the fix for Rx stall during OOM and network stress
	net_sched: fix error recovery at qdisc creation
	net: sched: Fix one possible panic when no destroy callback
	net/phy: micrel: configure intterupts after autoneg workaround
	ipv6: avoid unregistering inet6_dev for loopback
	net: dp83640: Avoid NULL pointer dereference.
	tcp: reset sk_rx_dst in tcp_disconnect()
	net: prevent sign extension in dev_get_stats()
	bridge: mdb: fix leak on complete_info ptr on fail path
	rocker: move dereference before free
	bpf: prevent leaking pointer via xadd on unpriviledged
	net: handle NAPI_GRO_FREE_STOLEN_HEAD case also in napi_frags_finish()
	net/mlx5: Cancel delayed recovery work when unloading the driver
	liquidio: fix bug in soft reset failure detection
	net/mlx5e: Fix TX carrier errors report in get stats ndo
	ipv6: dad: don't remove dynamic addresses if link is down
	vxlan: fix hlist corruption
	net: core: Fix slab-out-of-bounds in netdev_stats_to_stats64
	net: ipv6: Compare lwstate in detecting duplicate nexthops
	vrf: fix bug_on triggered by rx when destroying a vrf
	rds: tcp: use sock_create_lite() to create the accept socket
	brcmfmac: fix possible buffer overflow in brcmf_cfg80211_mgmt_tx()
	brcmfmac: Fix a memory leak in error handling path in 'brcmf_cfg80211_attach'
	brcmfmac: Fix glom_skb leak in brcmf_sdiod_recv_chain
	sfc: don't read beyond unicast address list
	cfg80211: Define nla_policy for NL80211_ATTR_LOCAL_MESH_POWER_MODE
	cfg80211: Validate frequencies nested in NL80211_ATTR_SCAN_FREQUENCIES
	cfg80211: Check if PMKID attribute is of expected size
	cfg80211: Check if NAN service ID is of expected size
	irqchip/gic-v3: Fix out-of-bound access in gic_set_affinity
	parisc: Report SIGSEGV instead of SIGBUS when running out of stack
	parisc: use compat_sys_keyctl()
	parisc: DMA API: return error instead of BUG_ON for dma ops on non dma devs
	parisc/mm: Ensure IRQs are off in switch_mm()
	tools/lib/lockdep: Reduce MAX_LOCK_DEPTH to avoid overflowing lock_chain/: Depth
	thp, mm: fix crash due race in MADV_FREE handling
	kernel/extable.c: mark core_kernel_text notrace
	mm/list_lru.c: fix list_lru_count_node() to be race free
	fs/dcache.c: fix spin lockup issue on nlru->lock
	checkpatch: silence perl 5.26.0 unescaped left brace warnings
	binfmt_elf: use ELF_ET_DYN_BASE only for PIE
	arm: move ELF_ET_DYN_BASE to 4MB
	arm64: move ELF_ET_DYN_BASE to 4GB / 4MB
	powerpc: move ELF_ET_DYN_BASE to 4GB / 4MB
	s390: reduce ELF_ET_DYN_BASE
	exec: Limit arg stack to at most 75% of _STK_LIM
	ARM64: dts: marvell: armada37xx: Fix timer interrupt specifiers
	vt: fix unchecked __put_user() in tioclinux ioctls
	rcu: Add memory barriers for NOCB leader wakeup
	nvmem: core: fix leaks on registration errors
	mnt: In umount propagation reparent in a separate pass
	mnt: In propgate_umount handle visiting mounts in any order
	mnt: Make propagate_umount less slow for overlapping mount propagation trees
	selftests/capabilities: Fix the test_execve test
	mm: fix overflow check in expand_upwards()
	crypto: talitos - Extend max key length for SHA384/512-HMAC and AEAD
	crypto: atmel - only treat EBUSY as transient if backlog
	crypto: sha1-ssse3 - Disable avx2
	crypto: caam - properly set IV after {en,de}crypt
	crypto: caam - fix signals handling
	Revert "sched/core: Optimize SCHED_SMT"
	sched/fair, cpumask: Export for_each_cpu_wrap()
	sched/topology: Fix building of overlapping sched-groups
	sched/topology: Optimize build_group_mask()
	sched/topology: Fix overlapping sched_group_mask
	PM / wakeirq: Convert to SRCU
	PM / QoS: return -EINVAL for bogus strings
	tracing: Use SOFTIRQ_OFFSET for softirq dectection for more accurate results
	kvm: vmx: Do not disable intercepts for BNDCFGS
	kvm: x86: Guest BNDCFGS requires guest MPX support
	kvm: vmx: Check value written to IA32_BNDCFGS
	kvm: vmx: allow host to access guest MSR_IA32_BNDCFGS
	4.9.39

Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
 2017-07-21 08:55:50 +02:00