As noted in Documentation/atomic_t.txt, if we don't need the RMW atomic
operations, we should only use READ_ONCE()/WRITE_ONCE() +
smp_rmb()/smp_wmb() where necessary (or the combined variants
smp_load_acquire()/smp_store_release()).
This patch converts the sidtab code to use regular u32 for the counter
and reverse lookup cache and use the appropriate operations instead of
atomic_get()/atomic_set(). Note that when reading/updating the reverse
lookup cache we don't need memory barriers as it doesn't need to be
consistent or accurate. We can now also replace some atomic ops with
regular loads (when under spinlock) and stores (for conversion target
fields that are always accessed under the master table's spinlock).
We can now also bump SIDTAB_MAX to U32_MAX as we can use the full u32
range again.
Suggested-by: Jann Horn <jannh@google.com>
Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com>
Reviewed-by: Jann Horn <jannh@google.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
(cherry picked from commit 116f21bb96)
Change-Id: I15ecafe9be3cc434fc91978d6621333b8a5669cb
Bug: 140252993
Signed-off-by: Jeff Vander Stoep <jeffv@google.com>
We need to error out when trying to add an entry above SIDTAB_MAX in
sidtab_reverse_lookup() to avoid overflow on the odd chance that this
happens.
Cc: stable@vger.kernel.org
Fixes: ee1a84fdfe ("selinux: overhaul sidtab to fix bug and improve performance")
Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Paul Moore <paul@paul-moore.com>
(cherry picked from commit acbc372e61)
Change-Id: I88e6b5b1626c901e41ecbf1dfdded6f4e7301332
Bug: 140252993
Signed-off-by: Jeff Vander Stoep <jeffv@google.com>
string_to_context_struct() may garble the context string, so we need to
copy back the contents again from the old context struct to avoid
storing the corrupted context.
Since string_to_context_struct() tokenizes (and therefore truncates) the
context string and we are later potentially copying it with kstrdup(),
this may eventually cause pieces of uninitialized kernel memory to be
disclosed to userspace (when copying to userspace based on the stored
length and not the null character).
How to reproduce on Fedora and similar:
# dnf install -y memcached
# systemctl start memcached
# semodule -d memcached
# load_policy
# load_policy
# systemctl stop memcached
# ausearch -m AVC
type=AVC msg=audit(1570090572.648:313): avc: denied { signal } for pid=1 comm="systemd" scontext=system_u:system_r:init_t:s0 tcontext=system_u:object_r:unlabeled_t:s0 tclass=process permissive=0 trawcon=73797374656D5F75007400000000000070BE6E847296FFFF726F6D000096FFFF76
Cc: stable@vger.kernel.org
Reported-by: Milos Malik <mmalik@redhat.com>
Fixes: ee1a84fdfe ("selinux: overhaul sidtab to fix bug and improve performance")
Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com>
Acked-by: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: Paul Moore <paul@paul-moore.com>
(cherry picked from commit 2a5243937c)
Change-Id: I56add9632ba622b956adb00a2b1ecfc608a37c32
Bug: 140252993
Signed-off-by: Jeff Vander Stoep <jeffv@google.com>
Before this patch, during a policy reload the sidtab would become frozen
and trying to map a new context to SID would be unable to add a new
entry to sidtab and fail with -ENOMEM.
Such failures are usually propagated into userspace, which has no way of
distignuishing them from actual allocation failures and thus doesn't
handle them gracefully. Such situation can be triggered e.g. by the
following reproducer:
while true; do load_policy; echo -n .; sleep 0.1; done &
for (( i = 0; i < 1024; i++ )); do
runcon -l s0:c$i echo -n x || break
# or:
# chcon -l s0:c$i <some_file> || break
done
This patch overhauls the sidtab so it doesn't need to be frozen during
policy reload, thus solving the above problem.
The new SID table leverages the fact that SIDs are allocated
sequentially and are never invalidated and stores them in linear buckets
indexed by a tree structure. This brings several advantages:
1. Fast SID -> context lookup - this lookup can now be done in
logarithmic time complexity (usually in less than 4 array lookups)
and can still be done safely without locking.
2. No need to re-search the whole table on reverse lookup miss - after
acquiring the spinlock only the newly added entries need to be
searched, which means that reverse lookups that end up inserting a
new entry are now about twice as fast.
3. No need to freeze sidtab during policy reload - it is now possible
to handle insertion of new entries even during sidtab conversion.
The tree structure of the new sidtab is able to grow automatically to up
to about 2^31 entries (at which point it should not have more than about
4 tree levels). The old sidtab had a theoretical capacity of almost 2^32
entries, but half of that is still more than enough since by that point
the reverse table lookups would become unusably slow anyway...
The number of entries per tree node is selected automatically so that
each node fits into a single page, which should be the easiest size for
kmalloc() to handle.
Note that the cache for reverse lookup is preserved with equivalent
logic. The only difference is that instead of storing pointers to the
hash table nodes it stores just the indices of the cached entries.
The new cache ensures that the indices are loaded/stored atomically, but
it still has the drawback that concurrent cache updates may mess up the
contents of the cache. Such situation however only reduces its
effectivity, not the correctness of lookups.
Tested by selinux-testsuite and thoroughly tortured by this simple
stress test:
```
function rand_cat() {
echo $(( $RANDOM % 1024 ))
}
function do_work() {
while true; do
echo -n "system_u:system_r:kernel_t:s0:c$(rand_cat),c$(rand_cat)" \
>/sys/fs/selinux/context 2>/dev/null || true
done
}
do_work >/dev/null &
do_work >/dev/null &
do_work >/dev/null &
while load_policy; do echo -n .; sleep 0.1; done
kill %1
kill %2
kill %3
```
Link: https://github.com/SELinuxProject/selinux-kernel/issues/38
Reported-by: Orion Poplawski <orion@nwra.com>
Reported-by: Li Kun <hw.likun@huawei.com>
Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com>
Reviewed-by: Stephen Smalley <sds@tycho.nsa.gov>
[PM: most of sidtab.c merged by hand due to conflicts]
[PM: checkpatch fixes in mls.c, services.c, sidtab.c]
Signed-off-by: Paul Moore <paul@paul-moore.com>
(cherry picked from commit ee1a84fdfe)
Change-Id: I0c3e122cbbf307ad558eb9283127b30118767a53
Bug: 140252993
Signed-off-by: Jeff Vander Stoep <jeffv@google.com>
The intended behavior change for this patch is to reject any MLS strings
that contain (trailing) garbage if p->mls_enabled is true.
As suggested by Paul Moore, change mls_context_to_sid() so that the two
parts of the range are extracted before the rest of the parsing. Because
now we don't have to scan for two different separators simultaneously
everywhere, we can actually switch to strchr() everywhere instead of the
open-coded loops that scan for two separators at once.
mls_context_to_sid() used to signal how much of the input string was parsed
by updating `*scontext`. However, there is actually no case in which
mls_context_to_sid() only parses a subset of the input and still returns
a success (other than the buggy case with a second '-' in which it
incorrectly claims to have consumed the entire string). Turn `scontext`
into a simple pointer argument and stop redundantly checking whether the
entire input was consumed in string_to_context_struct(). This also lets us
remove the `scontext_len` argument from `string_to_context_struct()`.
Signed-off-by: Jann Horn <jannh@google.com>
[PM: minor merge fuzz in convert_context()]
Signed-off-by: Paul Moore <paul@paul-moore.com>
(cherry picked from commit 95ffe19420)
Change-Id: I63960c9ef54cc29381f3bade53115cc6ed376045
Bug: 140252993
Signed-off-by: Jeff Vander Stoep <jeffv@google.com>
This moves handling of initial SIDs into a separate table. Note that the
SIDs stored in the main table are now shifted by SECINITSID_NUM and
converted to/from the actual SIDs transparently by helper functions.
This change doesn't make much sense on its own, but it simplifies
further sidtab overhaul in a succeeding patch.
Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com>
Reviewed-by: Stephen Smalley <sds@tycho.nsa.gov>
[PM: fixed some checkpatch warnings on line length, whitespace]
Signed-off-by: Paul Moore <paul@paul-moore.com>
(cherry picked from commit 24ed7fdae6)
Change-Id: I63e5163c6c96f7497303b9a13685d7aa360450c1
Bug: 140252993
Signed-off-by: Jeff Vander Stoep <jeffv@google.com>
This is a purely cosmetic change that encapsulates the three-step sidtab
conversion logic (shutdown -> clone -> map) into a single function
defined in sidtab.c (as opposed to services.c).
Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com>
Acked-by: Stephen Smalley <sds@tycho.nsa.gov>
[PM: whitespaces fixes to make checkpatch happy]
Signed-off-by: Paul Moore <paul@paul-moore.com>
(cherry picked from commit 5386e6caa6)
Change-Id: If23e6e40bd0c920cac090c2e9379d148d3ac6ca3
Bug: 140252993
Signed-off-by: Jeff Vander Stoep <jeffv@google.com>
Some clocks (that are left on at boot) of a clock provider with sync
state support might not have their "state held" during clock
registration because they remain orphans even after all the clocks in
the clock provider are registered.
These are typically clocks whose current parent is registered by a
different clock provider. When the other clock providers are registered,
these orphan clocks get adopted (no longer orphans) and will have their
"state held".
However if the clock provider of the parent clocks are modules, then
these orphan clocks would get turned off during late_initcall_sync()
because they'd look like unused clocks at that point. This might turn
off clocks that are in use by an active hardware block and cause system
issues.
To avoid this, don't turn off an unused clock if its clock provider has
sync state support and the clock doesn't have the CLK_DONT_HOLD_STATE
flag set.
Bug: 144066914
Signed-off-by: Saravana Kannan <saravanak@google.com>
Change-Id: I1f1dbca4994a5b7085930996e1cc5e848266436c
Clock providers whose drivers have sync_state() implemented will disable
their clocks once all their consumers have probed. So during
late_initcall_sync(), don't disable unused clocks of these clock
providers.
Also, provide a clk_sync_state() API that clock providers can use to
disable all their unused clocks once they get their sync_state()
callback.
Bug: 144066914
Signed-off-by: Saravana Kannan <saravanak@google.com>
Change-Id: Id01bfc15347812faa19802463c088db162c7d117
Add an API to check if a device has sync_state support in its driver or
bus.
Bug: 144066914
Signed-off-by: Saravana Kannan <saravanak@google.com>
Change-Id: I86b7d241512a366909645736a0b5abc51a11a5bd
Leaf changes summary: 1 artifact changed
Changed leaf types summary: 1 leaf type changed
Removed/Changed/Added functions summary: 0 Removed, 0 Changed, 0 Added function
Removed/Changed/Added variables summary: 0 Removed, 0 Changed, 0 Added variable
'struct perf_event at perf_event.h:560:1' changed:
type size changed from 7744 to 7808 (in bits)
1 data member insertion:
'void* perf_event::security', at offset 7616 (in bits) at perf_event.h:709:1
there are data member changes:
'list_head perf_event::sb_list' offset changed from 7616 to 7680 (in bits) (by +64 bits)
8 impacted interfaces:
function event_trigger_type event_triggers_call(trace_event_file*, void*, ring_buffer_event*)
function void perf_trace_run_bpf_submit(void*, int, int, trace_event_call*, u64, pt_regs*, hlist_head*, task_struct*)
function int trace_define_field(trace_event_call*, const char*, const char*, int, int, int, int)
function void trace_event_buffer_commit(trace_event_buffer*)
function void* trace_event_buffer_reserve(trace_event_buffer*, trace_event_file*, unsigned long int)
function bool trace_event_ignore_this_pid(trace_event_file*)
function int trace_event_raw_init(trace_event_call*)
function int trace_event_reg(trace_event_call*, trace_reg, void*)
Bug: 137092007
Change-Id: I2549303c833aecf30c8eb69c541481fbac9cfef7
Signed-off-by: Ryan Savitski <rsavitski@google.com>
In current mainline, the degree of access to perf_event_open(2) system
call depends on the perf_event_paranoid sysctl. This has a number of
limitations:
1. The sysctl is only a single value. Many types of accesses are controlled
based on the single value thus making the control very limited and
coarse grained.
2. The sysctl is global, so if the sysctl is changed, then that means
all processes get access to perf_event_open(2) opening the door to
security issues.
This patch adds LSM and SELinux access checking which will be used in
Android to access perf_event_open(2) for the purposes of attaching BPF
programs to tracepoints, perf profiling and other operations from
userspace. These operations are intended for production systems.
5 new LSM hooks are added:
1. perf_event_open: This controls access during the perf_event_open(2)
syscall itself. The hook is called from all the places that the
perf_event_paranoid sysctl is checked to keep it consistent with the
systctl. The hook gets passed a 'type' argument which controls CPU,
kernel and tracepoint accesses (in this context, CPU, kernel and
tracepoint have the same semantics as the perf_event_paranoid sysctl).
Additionally, I added an 'open' type which is similar to
perf_event_paranoid sysctl == 3 patch carried in Android and several other
distros but was rejected in mainline [1] in 2016.
2. perf_event_alloc: This allocates a new security object for the event
which stores the current SID within the event. It will be useful when
the perf event's FD is passed through IPC to another process which may
try to read the FD. Appropriate security checks will limit access.
3. perf_event_free: Called when the event is closed.
4. perf_event_read: Called from the read(2) and mmap(2) syscalls for the event.
5. perf_event_write: Called from the ioctl(2) syscalls for the event.
[1] https://lwn.net/Articles/696240/
Since Peter had suggest LSM hooks in 2016 [1], I am adding his
Suggested-by tag below.
To use this patch, we set the perf_event_paranoid sysctl to -1 and then
apply selinux checking as appropriate (default deny everything, and then
add policy rules to give access to domains that need it). In the future
we can remove the perf_event_paranoid sysctl altogether.
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Co-developed-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: James Morris <jmorris@namei.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: rostedt@goodmis.org
Cc: Yonghong Song <yhs@fb.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: jeffv@google.com
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: primiano@google.com
Cc: Song Liu <songliubraving@fb.com>
Cc: rsavitski@google.com
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Matthew Garrett <matthewgarrett@google.com>
Link: https://lkml.kernel.org/r/20191014170308.70668-1-joel@joelfernandes.org
Bug: 137092007
Change-Id: I591c6ad6c82ab9133409e51383d2c9b9f6ae4545
(cherry picked from commit da97e18458)
[ Ryan Savitski:
Resolved conflicts with existing code, no new functionality ]
Signed-off-by: Ryan Savitski <rsavitski@google.com>
The representation changed, but the tooling did not consider it a leaf
change, hence fell through the cracks. Fixing this. That had changed:
[C]'function int register_pernet_subsys(pernet_operations*)' at net_namespace.c:1051:1 has some indirect sub-type changes:
parameter 1 of type 'pernet_operations*' has sub-type changes:
in pointed to type 'struct pernet_operations' at net_namespace.h:330:1:
type size hasn't changed
1 data member changes (1 filtered):
type of 'void ()* pernet_operations::exit' changed:
in pointed to type 'function type void (net*)':
parameter 1 of type 'net*' has sub-type changes:
in pointed to type 'struct net' at net_namespace.h:51:1:
type size hasn't changed
1 data member changes (1 filtered):
type of 'netns_ipv6 net::ipv6' changed:
type size hasn't changed
1 data member change:
type of 'dst_ops netns_ipv6::ip6_dst_ops' changed:
type size hasn't changed
1 data member changes (1 filtered):
type of 'void ()* dst_ops::update_pmtu' changed:
in pointed to type 'function type void (dst_entry*, sock*, sk_buff*, typedef u32)':
parameter 5 of type 'typedef bool' was added
Bug: 147185563
Change-Id: Ibed95d59e6d01fcc266fbc73885c7deb40baf957
Signed-off-by: Matthias Maennich <maennich@google.com>
Changes in 4.19.93
scsi: lpfc: Fix discovery failures when target device connectivity bounces
scsi: mpt3sas: Fix clear pending bit in ioctl status
scsi: lpfc: Fix locking on mailbox command completion
Input: atmel_mxt_ts - disable IRQ across suspend
f2fs: fix to update time in lazytime mode
iommu: rockchip: Free domain on .domain_free
iommu/tegra-smmu: Fix page tables in > 4 GiB memory
dmaengine: xilinx_dma: Clear desc_pendingcount in xilinx_dma_reset
scsi: target: compare full CHAP_A Algorithm strings
scsi: lpfc: Fix SLI3 hba in loop mode not discovering devices
scsi: csiostor: Don't enable IRQs too early
scsi: hisi_sas: Replace in_softirq() check in hisi_sas_task_exec()
powerpc/pseries: Mark accumulate_stolen_time() as notrace
powerpc/pseries: Don't fail hash page table insert for bolted mapping
powerpc/tools: Don't quote $objdump in scripts
dma-debug: add a schedule point in debug_dma_dump_mappings()
leds: lm3692x: Handle failure to probe the regulator
clocksource/drivers/asm9260: Add a check for of_clk_get
clocksource/drivers/timer-of: Use unique device name instead of timer
powerpc/security/book3s64: Report L1TF status in sysfs
powerpc/book3s64/hash: Add cond_resched to avoid soft lockup warning
ext4: update direct I/O read lock pattern for IOCB_NOWAIT
ext4: iomap that extends beyond EOF should be marked dirty
jbd2: Fix statistics for the number of logged blocks
scsi: tracing: Fix handling of TRANSFER LENGTH == 0 for READ(6) and WRITE(6)
scsi: lpfc: Fix duplicate unreg_rpi error in port offline flow
f2fs: fix to update dir's i_pino during cross_rename
clk: qcom: Allow constant ratio freq tables for rcg
clk: clk-gpio: propagate rate change to parent
irqchip/irq-bcm7038-l1: Enable parent IRQ if necessary
irqchip: ingenic: Error out if IRQ domain creation failed
fs/quota: handle overflows of sysctl fs.quota.* and report as unsigned long
scsi: lpfc: fix: Coverity: lpfc_cmpl_els_rsp(): Null pointer dereferences
PCI: rpaphp: Fix up pointer to first drc-info entry
scsi: ufs: fix potential bug which ends in system hang
powerpc/pseries/cmm: Implement release() function for sysfs device
PCI: rpaphp: Don't rely on firmware feature to imply drc-info support
PCI: rpaphp: Annotate and correctly byte swap DRC properties
PCI: rpaphp: Correctly match ibm, my-drc-index to drc-name when using drc-info
powerpc/security: Fix wrong message when RFI Flush is disable
scsi: atari_scsi: sun3_scsi: Set sg_tablesize to 1 instead of SG_NONE
clk: pxa: fix one of the pxa RTC clocks
bcache: at least try to shrink 1 node in bch_mca_scan()
HID: quirks: Add quirk for HP MSU1465 PIXART OEM mouse
HID: logitech-hidpp: Silence intermittent get_battery_capacity errors
ARM: 8937/1: spectre-v2: remove Brahma-B53 from hardening
libnvdimm/btt: fix variable 'rc' set but not used
HID: Improve Windows Precision Touchpad detection.
HID: rmi: Check that the RMI_STARTED bit is set before unregistering the RMI transport device
watchdog: Fix the race between the release of watchdog_core_data and cdev
scsi: pm80xx: Fix for SATA device discovery
scsi: ufs: Fix error handing during hibern8 enter
scsi: scsi_debug: num_tgts must be >= 0
scsi: NCR5380: Add disconnect_mask module parameter
scsi: iscsi: Don't send data to unbound connection
scsi: target: iscsi: Wait for all commands to finish before freeing a session
gpio: mpc8xxx: Don't overwrite default irq_set_type callback
apparmor: fix unsigned len comparison with less than zero
scripts/kallsyms: fix definitely-lost memory leak
powerpc: Don't add -mabi= flags when building with Clang
cdrom: respect device capabilities during opening action
perf script: Fix brstackinsn for AUXTRACE
perf regs: Make perf_reg_name() return "unknown" instead of NULL
s390/zcrypt: handle new reply code FILTERED_BY_HYPERVISOR
libfdt: define INT32_MAX and UINT32_MAX in libfdt_env.h
s390/cpum_sf: Check for SDBT and SDB consistency
ocfs2: fix passing zero to 'PTR_ERR' warning
mailbox: imx: Fix Tx doorbell shutdown path
kernel: sysctl: make drop_caches write-only
userfaultfd: require CAP_SYS_PTRACE for UFFD_FEATURE_EVENT_FORK
Revert "powerpc/vcpu: Assume dedicated processors as non-preempt"
x86/mce: Fix possibly incorrect severity calculation on AMD
net, sysctl: Fix compiler warning when only cBPF is present
netfilter: nf_queue: enqueue skbs with NULL dst
ALSA: hda - Downgrade error message for single-cmd fallback
bonding: fix active-backup transition after link failure
perf strbuf: Remove redundant va_end() in strbuf_addv()
Make filldir[64]() verify the directory entry filename is valid
filldir[64]: remove WARN_ON_ONCE() for bad directory entries
netfilter: ebtables: compat: reject all padding in matches/watchers
6pack,mkiss: fix possible deadlock
netfilter: bridge: make sure to pull arp header in br_nf_forward_arp()
inetpeer: fix data-race in inet_putpeer / inet_putpeer
net: add a READ_ONCE() in skb_peek_tail()
net: icmp: fix data-race in cmp_global_allow()
hrtimer: Annotate lockless access to timer->state
net: ena: fix napi handler misbehavior when the napi budget is zero
net/mlxfw: Fix out-of-memory error in mfa2 flash burning
net: stmmac: dwmac-meson8b: Fix the RGMII TX delay on Meson8b/8m2 SoCs
ptp: fix the race between the release of ptp_clock and cdev
tcp: Fix highest_sack and highest_sack_seq
udp: fix integer overflow while computing available space in sk_rcvbuf
vhost/vsock: accept only packets with the right dst_cid
net: add bool confirm_neigh parameter for dst_ops.update_pmtu
ip6_gre: do not confirm neighbor when do pmtu update
gtp: do not confirm neighbor when do pmtu update
net/dst: add new function skb_dst_update_pmtu_no_confirm
tunnel: do not confirm neighbor when do pmtu update
vti: do not confirm neighbor when do pmtu update
sit: do not confirm neighbor when do pmtu update
net/dst: do not confirm neighbor for vxlan and geneve pmtu update
gtp: do not allow adding duplicate tid and ms_addr pdp context
net: marvell: mvpp2: phylink requires the link interrupt
tcp/dccp: fix possible race __inet_lookup_established()
tcp: do not send empty skb from tcp_write_xmit()
gtp: fix wrong condition in gtp_genl_dump_pdp()
gtp: fix an use-after-free in ipv4_pdp_find()
gtp: avoid zero size hashtable
spi: fsl: don't map irq during probe
tty/serial: atmel: fix out of range clock divider handling
pinctrl: baytrail: Really serialize all register accesses
spi: fsl: use platform_get_irq() instead of of_irq_to_resource()
Linux 4.19.93
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: Ie31b3fba19c5a45be0b85f272bc50cb8b67ea3c0
[ Upstream commit 40ecab5512 ]
Commit 39ce8150a0 ("pinctrl: baytrail: Serialize all register access")
added a spinlock around all register accesses because:
"There is a hardware issue in Intel Baytrail where concurrent GPIO register
access might result reads of 0xffffffff and writes might get dropped
completely."
Testing has shown that this does not catch all cases, there are still
2 problems remaining
1) The original fix uses a spinlock per byt_gpio device / struct,
additional testing has shown that this is not sufficient concurent
accesses to 2 different GPIO banks also suffer from the same problem.
This commit fixes this by moving to a single global lock.
2) The original fix did not add a lock around the register accesses in
the suspend/resume handling.
Since pinctrl-baytrail.c is using normal suspend/resume handlers,
interrupts are still enabled during suspend/resume handling. Nothing
should be using the GPIOs when they are being taken down, _but_ the
GPIOs themselves may still cause interrupts, which are likely to
use (read) the triggering GPIO. So we need to protect against
concurrent GPIO register accesses in the suspend/resume handlers too.
This commit fixes this by adding the missing spin_lock / unlock calls.
The 2 fixes together fix the Acer Switch 10 SW5-012 getting completely
confused after a suspend resume. The DSDT for this device has a bug
in its _LID method which reprograms the home and power button trigger-
flags requesting both high and low _level_ interrupts so the IRQs for
these 2 GPIOs continuously fire. This combined with the saving of
registers during suspend, triggers concurrent GPIO register accesses
resulting in saving 0xffffffff as pconf0 value during suspend and then
when restoring this on resume the pinmux settings get all messed up,
resulting in various I2C busses being stuck, the wifi no longer working
and often the tablet simply not coming out of suspend at all.
Cc: stable@vger.kernel.org
Fixes: 39ce8150a0 ("pinctrl: baytrail: Serialize all register access")
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
[ Upstream commit 6a902c0f31 ]
GTP default hashtable size is 1024 and userspace could set specific
hashtable size with IFLA_GTP_PDP_HASHSIZE. If hashtable size is set to 0
from userspace, hashtable will not work and panic will occur.
Fixes: 459aa660eb ("gtp: add initial driver for datapath of GPRS Tunneling Protocol (GTP-U)")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[ Upstream commit 94dc550a50 ]
ipv4_pdp_find() is called in TX packet path of GTP.
ipv4_pdp_find() internally uses gtp->tid_hash to lookup pdp context.
In the current code, gtp->tid_hash and gtp->addr_hash are freed by
->dellink(), which is gtp_dellink().
But gtp_dellink() would be called while packets are processing.
So, gtp_dellink() should not free gtp->tid_hash and gtp->addr_hash.
Instead, dev->priv_destructor() would be used because this callback
is called after all packet processing safely.
Test commands:
ip link add veth1 type veth peer name veth2
ip a a 172.0.0.1/24 dev veth1
ip link set veth1 up
ip a a 172.99.0.1/32 dev lo
gtp-link add gtp1 &
gtp-tunnel add gtp1 v1 200 100 172.99.0.2 172.0.0.2
ip r a 172.99.0.2/32 dev gtp1
ip link set gtp1 mtu 1500
ip netns add ns2
ip link set veth2 netns ns2
ip netns exec ns2 ip a a 172.0.0.2/24 dev veth2
ip netns exec ns2 ip link set veth2 up
ip netns exec ns2 ip a a 172.99.0.2/32 dev lo
ip netns exec ns2 ip link set lo up
ip netns exec ns2 gtp-link add gtp2 &
ip netns exec ns2 gtp-tunnel add gtp2 v1 100 200 172.99.0.1 172.0.0.1
ip netns exec ns2 ip r a 172.99.0.1/32 dev gtp2
ip netns exec ns2 ip link set gtp2 mtu 1500
hping3 172.99.0.2 -2 --flood &
ip link del gtp1
Splat looks like:
[ 72.568081][ T1195] BUG: KASAN: use-after-free in ipv4_pdp_find.isra.12+0x130/0x170 [gtp]
[ 72.568916][ T1195] Read of size 8 at addr ffff8880b9a35d28 by task hping3/1195
[ 72.569631][ T1195]
[ 72.569861][ T1195] CPU: 2 PID: 1195 Comm: hping3 Not tainted 5.5.0-rc1 #199
[ 72.570547][ T1195] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006
[ 72.571438][ T1195] Call Trace:
[ 72.571764][ T1195] dump_stack+0x96/0xdb
[ 72.572171][ T1195] ? ipv4_pdp_find.isra.12+0x130/0x170 [gtp]
[ 72.572761][ T1195] print_address_description.constprop.5+0x1be/0x360
[ 72.573400][ T1195] ? ipv4_pdp_find.isra.12+0x130/0x170 [gtp]
[ 72.573971][ T1195] ? ipv4_pdp_find.isra.12+0x130/0x170 [gtp]
[ 72.574544][ T1195] __kasan_report+0x12a/0x16f
[ 72.575014][ T1195] ? ipv4_pdp_find.isra.12+0x130/0x170 [gtp]
[ 72.575593][ T1195] kasan_report+0xe/0x20
[ 72.576004][ T1195] ipv4_pdp_find.isra.12+0x130/0x170 [gtp]
[ 72.576577][ T1195] gtp_build_skb_ip4+0x199/0x1420 [gtp]
[ ... ]
[ 72.647671][ T1195] BUG: unable to handle page fault for address: ffff8880b9a35d28
[ 72.648512][ T1195] #PF: supervisor read access in kernel mode
[ 72.649158][ T1195] #PF: error_code(0x0000) - not-present page
[ 72.649849][ T1195] PGD a6c01067 P4D a6c01067 PUD 11fb07067 PMD 11f939067 PTE 800fffff465ca060
[ 72.652958][ T1195] Oops: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN PTI
[ 72.653834][ T1195] CPU: 2 PID: 1195 Comm: hping3 Tainted: G B 5.5.0-rc1 #199
[ 72.668062][ T1195] RIP: 0010:ipv4_pdp_find.isra.12+0x86/0x170 [gtp]
[ ... ]
[ 72.679168][ T1195] Call Trace:
[ 72.679603][ T1195] gtp_build_skb_ip4+0x199/0x1420 [gtp]
[ 72.681915][ T1195] ? ipv4_pdp_find.isra.12+0x170/0x170 [gtp]
[ 72.682513][ T1195] ? lock_acquire+0x164/0x3b0
[ 72.682966][ T1195] ? gtp_dev_xmit+0x35e/0x890 [gtp]
[ 72.683481][ T1195] gtp_dev_xmit+0x3c2/0x890 [gtp]
[ ... ]
Fixes: 459aa660eb ("gtp: add initial driver for datapath of GPRS Tunneling Protocol (GTP-U)")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[ Upstream commit 94a6d9fb88 ]
gtp_genl_dump_pdp() is ->dumpit() callback of GTP module and it is used
to dump pdp contexts. it would be re-executed because of dump packet size.
If dump packet size is too big, it saves current dump pointer
(gtp interface pointer, bucket, TID value) then it restarts dump from
last pointer.
Current GTP code allows adding zero TID pdp context but dump code
ignores zero TID value. So, last dump pointer will not be found.
In addition, this patch adds missing rcu_read_lock() in
gtp_genl_dump_pdp().
Fixes: 459aa660eb ("gtp: add initial driver for datapath of GPRS Tunneling Protocol (GTP-U)")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[ Upstream commit 1f85e6267c ]
Backport of commit fdfc5c8594 ("tcp: remove empty skb from
write queue in error cases") in linux-4.14 stable triggered
various bugs. One of them has been fixed in commit ba2ddb43f2
("tcp: Don't dequeue SYN/FIN-segments from write-queue"), but
we still have crashes in some occasions.
Root-cause is that when tcp_sendmsg() has allocated a fresh
skb and could not append a fragment before being blocked
in sk_stream_wait_memory(), tcp_write_xmit() might be called
and decide to send this fresh and empty skb.
Sending an empty packet is not only silly, it might have caused
many issues we had in the past with tp->packets_out being
out of sync.
Fixes: c65f7f00c5 ("[TCP]: Simplify SKB data portion allocation with NETIF_F_SG.")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Christoph Paasch <cpaasch@apple.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Cc: Jason Baron <jbaron@akamai.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
commit 8dbd76e79a upstream.
Michal Kubecek and Firo Yang did a very nice analysis of crashes
happening in __inet_lookup_established().
Since a TCP socket can go from TCP_ESTABLISH to TCP_LISTEN
(via a close()/socket()/listen() cycle) without a RCU grace period,
I should not have changed listeners linkage in their hash table.
They must use the nulls protocol (Documentation/RCU/rculist_nulls.txt),
so that a lookup can detect a socket in a hash list was moved in
another one.
Since we added code in commit d296ba60d8 ("soreuseport: Resolve
merge conflict for v4/v6 ordering fix"), we have to add
hlist_nulls_add_tail_rcu() helper.
Fixes: 3b24d854cb ("tcp/dccp: do not touch listener sk_refcnt under synflood")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Michal Kubecek <mkubecek@suse.cz>
Reported-by: Firo Yang <firo.yang@suse.com>
Reviewed-by: Michal Kubecek <mkubecek@suse.cz>
Link: https://lore.kernel.org/netdev/20191120083919.GH27852@unicorn.suse.cz/
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
[stable-4.19: we also need to update code in __inet_lookup_listener() and
inet6_lookup_listener() which has been removed in 5.0-rc1.]
Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[ Upstream commit f3f2364ea1 ]
phylink requires the MAC to report when its link status changes when
operating in inband modes. Failure to report link status changes
means that phylink has no idea when the link events happen, which
results in either the network interface's carrier remaining up or
remaining permanently down.
For example, with a fiber module, if the interface is brought up and
link is initially established, taking the link down at the far end
will cut the optical power. The SFP module's LOS asserts, we
deactivate the link, and the network interface reports no carrier.
When the far end is brought back up, the SFP module's LOS deasserts,
but the MAC may be slower to establish link. If this happens (which
in my tests is a certainty) then phylink never hears that the MAC
has established link with the far end, and the network interface is
stuck reporting no carrier. This means the interface is
non-functional.
Avoiding the link interrupt when we have phylink is basically not
an option, so remove the !port->phylink from the test.
Fixes: 4bb0432628 ("net: mvpp2: phylink support")
Tested-by: Sven Auhagen <sven.auhagen@voleatech.de>
Tested-by: Antoine Tenart <antoine.tenart@bootlin.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[ Upstream commit 6b01b1d9b2 ]
GTP RX packet path lookups pdp context with TID. If duplicate TID pdp
contexts are existing in the list, it couldn't select correct pdp context.
So, TID value should be unique.
GTP TX packet path lookups pdp context with ms_addr. If duplicate ms_addr pdp
contexts are existing in the list, it couldn't select correct pdp context.
So, ms_addr value should be unique.
Fixes: 459aa660eb ("gtp: add initial driver for datapath of GPRS Tunneling Protocol (GTP-U)")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[ Upstream commit f081042d12 ]
When do IPv6 tunnel PMTU update and calls __ip6_rt_update_pmtu() in the end,
we should not call dst_confirm_neigh() as there is no two-way communication.
So disable the neigh confirm for vxlan and geneve pmtu update.
v5: No change.
v4: No change.
v3: Do not remove dst_confirm_neigh, but add a new bool parameter in
dst_ops.update_pmtu to control whether we should do neighbor confirm.
Also split the big patch to small ones for each area.
v2: Remove dst_confirm_neigh in __ip6_rt_update_pmtu.
Fixes: a93bf0ff44 ("vxlan: update skb dst pmtu on tx path")
Fixes: 52a589d51f ("geneve: update skb dst pmtu on tx path")
Reviewed-by: Guillaume Nault <gnault@redhat.com>
Tested-by: Guillaume Nault <gnault@redhat.com>
Acked-by: David Ahern <dsahern@gmail.com>
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[ Upstream commit 4d42df46d6 ]
When do IPv6 tunnel PMTU update and calls __ip6_rt_update_pmtu() in the end,
we should not call dst_confirm_neigh() as there is no two-way communication.
v5: No change.
v4: No change.
v3: Do not remove dst_confirm_neigh, but add a new bool parameter in
dst_ops.update_pmtu to control whether we should do neighbor confirm.
Also split the big patch to small ones for each area.
v2: Remove dst_confirm_neigh in __ip6_rt_update_pmtu.
Reviewed-by: Guillaume Nault <gnault@redhat.com>
Acked-by: David Ahern <dsahern@gmail.com>
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[ Upstream commit 8247a79efa ]
When do IPv6 tunnel PMTU update and calls __ip6_rt_update_pmtu() in the end,
we should not call dst_confirm_neigh() as there is no two-way communication.
Although vti and vti6 are immune to this problem because they are IFF_NOARP
interfaces, as Guillaume pointed. There is still no sense to confirm neighbour
here.
v5: Update commit description.
v4: No change.
v3: Do not remove dst_confirm_neigh, but add a new bool parameter in
dst_ops.update_pmtu to control whether we should do neighbor confirm.
Also split the big patch to small ones for each area.
v2: Remove dst_confirm_neigh in __ip6_rt_update_pmtu.
Reviewed-by: Guillaume Nault <gnault@redhat.com>
Acked-by: David Ahern <dsahern@gmail.com>
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[ Upstream commit 7a1592bcb1 ]
When do tunnel PMTU update and calls __ip6_rt_update_pmtu() in the end,
we should not call dst_confirm_neigh() as there is no two-way communication.
v5: No Change.
v4: Update commit description
v3: Do not remove dst_confirm_neigh, but add a new bool parameter in
dst_ops.update_pmtu to control whether we should do neighbor confirm.
Also split the big patch to small ones for each area.
v2: Remove dst_confirm_neigh in __ip6_rt_update_pmtu.
Fixes: 0dec879f63 ("net: use dst_confirm_neigh for UDP, RAW, ICMP, L2TP")
Reviewed-by: Guillaume Nault <gnault@redhat.com>
Tested-by: Guillaume Nault <gnault@redhat.com>
Acked-by: David Ahern <dsahern@gmail.com>
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[ Upstream commit 07dc35c6e3 ]
Add a new function skb_dst_update_pmtu_no_confirm() for callers who need
update pmtu but should not do neighbor confirm.
v5: No change.
v4: No change.
v3: Do not remove dst_confirm_neigh, but add a new bool parameter in
dst_ops.update_pmtu to control whether we should do neighbor confirm.
Also split the big patch to small ones for each area.
v2: Remove dst_confirm_neigh in __ip6_rt_update_pmtu.
Reviewed-by: Guillaume Nault <gnault@redhat.com>
Acked-by: David Ahern <dsahern@gmail.com>
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[ Upstream commit 6e9105c73f ]
When do IPv6 tunnel PMTU update and calls __ip6_rt_update_pmtu() in the end,
we should not call dst_confirm_neigh() as there is no two-way communication.
Although GTP only support ipv4 right now, and __ip_rt_update_pmtu() does not
call dst_confirm_neigh(), we still set it to false to keep consistency with
IPv6 code.
v5: No change.
v4: No change.
v3: Do not remove dst_confirm_neigh, but add a new bool parameter in
dst_ops.update_pmtu to control whether we should do neighbor confirm.
Also split the big patch to small ones for each area.
v2: Remove dst_confirm_neigh in __ip6_rt_update_pmtu.
Reviewed-by: Guillaume Nault <gnault@redhat.com>
Acked-by: David Ahern <dsahern@gmail.com>
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[ Upstream commit 675d76ad0a ]
When we do ipv6 gre pmtu update, we will also do neigh confirm currently.
This will cause the neigh cache be refreshed and set to REACHABLE before
xmit.
But if the remote mac address changed, e.g. device is deleted and recreated,
we will not able to notice this and still use the old mac address as the neigh
cache is REACHABLE.
Fix this by disable neigh confirm when do pmtu update
v5: No change.
v4: No change.
v3: Do not remove dst_confirm_neigh, but add a new bool parameter in
dst_ops.update_pmtu to control whether we should do neighbor confirm.
Also split the big patch to small ones for each area.
v2: Remove dst_confirm_neigh in __ip6_rt_update_pmtu.
Reported-by: Jianlin Shi <jishi@redhat.com>
Reviewed-by: Guillaume Nault <gnault@redhat.com>
Acked-by: David Ahern <dsahern@gmail.com>
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[ Upstream commit bd085ef678 ]
The MTU update code is supposed to be invoked in response to real
networking events that update the PMTU. In IPv6 PMTU update function
__ip6_rt_update_pmtu() we called dst_confirm_neigh() to update neighbor
confirmed time.
But for tunnel code, it will call pmtu before xmit, like:
- tnl_update_pmtu()
- skb_dst_update_pmtu()
- ip6_rt_update_pmtu()
- __ip6_rt_update_pmtu()
- dst_confirm_neigh()
If the tunnel remote dst mac address changed and we still do the neigh
confirm, we will not be able to update neigh cache and ping6 remote
will failed.
So for this ip_tunnel_xmit() case, _EVEN_ if the MTU is changed, we
should not be invoking dst_confirm_neigh() as we have no evidence
of successful two-way communication at this point.
On the other hand it is also important to keep the neigh reachability fresh
for TCP flows, so we cannot remove this dst_confirm_neigh() call.
To fix the issue, we have to add a new bool parameter for dst_ops.update_pmtu
to choose whether we should do neigh update or not. I will add the parameter
in this patch and set all the callers to true to comply with the previous
way, and fix the tunnel code one by one on later patches.
v5: No change.
v4: No change.
v3: Do not remove dst_confirm_neigh, but add a new bool parameter in
dst_ops.update_pmtu to control whether we should do neighbor confirm.
Also split the big patch to small ones for each area.
v2: Remove dst_confirm_neigh in __ip6_rt_update_pmtu.
Suggested-by: David Miller <davem@davemloft.net>
Reviewed-by: Guillaume Nault <gnault@redhat.com>
Acked-by: David Ahern <dsahern@gmail.com>
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[ Upstream commit 8a3cc29c31 ]
When we receive a new packet from the guest, we check if the
src_cid is correct, but we forgot to check the dst_cid.
The host should accept only packets where dst_cid is
equal to the host CID.
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[ Upstream commit feed8a4fc9 ]
When the size of the receive buffer for a socket is close to 2^31 when
computing if we have enough space in the buffer to copy a packet from
the queue to the buffer we might hit an integer overflow.
When an user set net.core.rmem_default to a value close to 2^31 UDP
packets are dropped because of this overflow. This can be visible, for
instance, with failure to resolve hostnames.
This can be fixed by casting sk_rcvbuf (which is an int) to unsigned
int, similarly to how it is done in TCP.
Signed-off-by: Antonio Messina <amessina@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[ Upstream commit 853697504d ]
>From commit 50895b9de1 ("tcp: highest_sack fix"), the logic about
setting tp->highest_sack to the head of the send queue was removed.
Of course the logic is error prone, but it is logical. Before we
remove the pointer to the highest sack skb and use the seq instead,
we need to set tp->highest_sack to NULL when there is no skb after
the last sack, and then replace NULL with the real skb when new skb
inserted into the rtx queue, because the NULL means the highest sack
seq is tp->snd_nxt. If tp->highest_sack is NULL and new data sent,
the next ACK with sack option will increase tp->reordering unexpectedly.
This patch sets tp->highest_sack to the tail of the rtx queue if
it's NULL and new data is sent. The patch keeps the rule that the
highest_sack can only be maintained by sack processing, except for
this only case.
Fixes: 50895b9de1 ("tcp: highest_sack fix")
Signed-off-by: Cambda Zhu <cambda@linux.alibaba.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[ Upstream commit a33121e548 ]
In a case when a ptp chardev (like /dev/ptp0) is open but an underlying
device is removed, closing this file leads to a race. This reproduces
easily in a kvm virtual machine:
ts# cat openptp0.c
int main() { ... fp = fopen("/dev/ptp0", "r"); ... sleep(10); }
ts# uname -r
5.5.0-rc3-46cf053e
ts# cat /proc/cmdline
... slub_debug=FZP
ts# modprobe ptp_kvm
ts# ./openptp0 &
[1] 670
opened /dev/ptp0, sleeping 10s...
ts# rmmod ptp_kvm
ts# ls /dev/ptp*
ls: cannot access '/dev/ptp*': No such file or directory
ts# ...woken up
[ 48.010809] general protection fault: 0000 [#1] SMP
[ 48.012502] CPU: 6 PID: 658 Comm: openptp0 Not tainted 5.5.0-rc3-46cf053e #25
[ 48.014624] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), ...
[ 48.016270] RIP: 0010:module_put.part.0+0x7/0x80
[ 48.017939] RSP: 0018:ffffb3850073be00 EFLAGS: 00010202
[ 48.018339] RAX: 000000006b6b6b6b RBX: 6b6b6b6b6b6b6b6b RCX: ffff89a476c00ad0
[ 48.018936] RDX: fffff65a08d3ea08 RSI: 0000000000000247 RDI: 6b6b6b6b6b6b6b6b
[ 48.019470] ... ^^^ a slub poison
[ 48.023854] Call Trace:
[ 48.024050] __fput+0x21f/0x240
[ 48.024288] task_work_run+0x79/0x90
[ 48.024555] do_exit+0x2af/0xab0
[ 48.024799] ? vfs_write+0x16a/0x190
[ 48.025082] do_group_exit+0x35/0x90
[ 48.025387] __x64_sys_exit_group+0xf/0x10
[ 48.025737] do_syscall_64+0x3d/0x130
[ 48.026056] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 48.026479] RIP: 0033:0x7f53b12082f6
[ 48.026792] ...
[ 48.030945] Modules linked in: ptp i6300esb watchdog [last unloaded: ptp_kvm]
[ 48.045001] Fixing recursive fault but reboot is needed!
This happens in:
static void __fput(struct file *file)
{ ...
if (file->f_op->release)
file->f_op->release(inode, file); <<< cdev is kfree'd here
if (unlikely(S_ISCHR(inode->i_mode) && inode->i_cdev != NULL &&
!(mode & FMODE_PATH))) {
cdev_put(inode->i_cdev); <<< cdev fields are accessed here
Namely:
__fput()
posix_clock_release()
kref_put(&clk->kref, delete_clock) <<< the last reference
delete_clock()
delete_ptp_clock()
kfree(ptp) <<< cdev is embedded in ptp
cdev_put
module_put(p->owner) <<< *p is kfree'd, bang!
Here cdev is embedded in posix_clock which is embedded in ptp_clock.
The race happens because ptp_clock's lifetime is controlled by two
refcounts: kref and cdev.kobj in posix_clock. This is wrong.
Make ptp_clock's sysfs device a parent of cdev with cdev_device_add()
created especially for such cases. This way the parent device with its
ptp_clock is not released until all references to the cdev are released.
This adds a requirement that an initialized but not exposed struct
device should be provided to posix_clock_register() by a caller instead
of a simple dev_t.
This approach was adopted from the commit 72139dfa24 ("watchdog: Fix
the race between the release of watchdog_core_data and cdev"). See
details of the implementation in the commit 233ed09d7f ("chardev: add
helper function to register char devs with a struct device").
Link: https://lore.kernel.org/linux-fsdevel/20191125125342.6189-1-vdronov@redhat.com/T/#u
Analyzed-by: Stephen Johnston <sjohnsto@redhat.com>
Analyzed-by: Vern Lovejoy <vlovejoy@redhat.com>
Signed-off-by: Vladis Dronov <vdronov@redhat.com>
Acked-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[ Upstream commit bd6f48546b ]
GXBB and newer SoCs use the fixed FCLK_DIV2 (1GHz) clock as input for
the m250_sel clock. Meson8b and Meson8m2 use MPLL2 instead, whose rate
can be adjusted at runtime.
So far we have been running MPLL2 with ~250MHz (and the internal
m250_div with value 1), which worked enough that we could transfer data
with an TX delay of 4ns. Unfortunately there is high packet loss with
an RGMII PHY when transferring data (receiving data works fine though).
Odroid-C1's u-boot is running with a TX delay of only 2ns as well as
the internal m250_div set to 2 - no lost (TX) packets can be observed
with that setting in u-boot.
Manual testing has shown that the TX packet loss goes away when using
the following settings in Linux (the vendor kernel uses the same
settings):
- MPLL2 clock set to ~500MHz
- m250_div set to 2
- TX delay set to 2ns on the MAC side
Update the m250_div divider settings to only accept dividers greater or
equal 2 to fix the TX delay generated by the MAC.
iperf3 results before the change:
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.00 sec 182 MBytes 153 Mbits/sec 514 sender
[ 5] 0.00-10.00 sec 182 MBytes 152 Mbits/sec receiver
iperf3 results after the change (including an updated TX delay of 2ns):
[ ID] Interval Transfer Bitrate Retr Cwnd
[ 5] 0.00-10.00 sec 927 MBytes 778 Mbits/sec 0 sender
[ 5] 0.00-10.01 sec 927 MBytes 777 Mbits/sec receiver
Fixes: 4f6a71b84e ("net: stmmac: dwmac-meson8b: fix internal RGMII clock configuration")
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[ Upstream commit a5bcd72e05 ]
The burning process requires to perform internal allocations of large
chunks of memory. This memory doesn't need to be contiguous and can be
safely allocated by vzalloc() instead of kzalloc(). This patch changes
such allocation to avoid possible out-of-memory failure.
Fixes: 410ed13cae ("Add the mlxfw module for Mellanox firmware flash process")
Signed-off-by: Vladyslav Tarasiuk <vladyslavt@mellanox.com>
Reviewed-by: Aya Levin <ayal@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Tested-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[ Upstream commit 24dee0c747 ]
In netpoll the napi handler could be called with budget equal to zero.
Current ENA napi handler doesn't take that into consideration.
The napi handler handles Rx packets in a do-while loop.
Currently, the budget check happens only after decrementing the
budget, therefore the napi handler, in rare cases, could run over
MAX_INT packets.
In addition to that, this moves all budget related variables to int
calculation and stop mixing u32 to avoid ambiguity
Fixes: 1738cd3ed3 ("net: ena: Add a driver for Amazon Elastic Network Adapters (ENA)")
Signed-off-by: Netanel Belgazal <netanel@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
commit e608f631f0 upstream.
syzbot reported following splat:
BUG: KASAN: vmalloc-out-of-bounds in size_entry_mwt net/bridge/netfilter/ebtables.c:2063 [inline]
BUG: KASAN: vmalloc-out-of-bounds in compat_copy_entries+0x128b/0x1380 net/bridge/netfilter/ebtables.c:2155
Read of size 4 at addr ffffc900004461f4 by task syz-executor267/7937
CPU: 1 PID: 7937 Comm: syz-executor267 Not tainted 5.5.0-rc1-syzkaller #0
size_entry_mwt net/bridge/netfilter/ebtables.c:2063 [inline]
compat_copy_entries+0x128b/0x1380 net/bridge/netfilter/ebtables.c:2155
compat_do_replace+0x344/0x720 net/bridge/netfilter/ebtables.c:2249
compat_do_ebt_set_ctl+0x22f/0x27e net/bridge/netfilter/ebtables.c:2333
[..]
Because padding isn't considered during computation of ->buf_user_offset,
"total" is decremented by fewer bytes than it should.
Therefore, the first part of
if (*total < sizeof(*entry) || entry->next_offset < sizeof(*entry))
will pass, -- it should not have. This causes oob access:
entry->next_offset is past the vmalloced size.
Reject padding and check that computed user offset (sum of ebt_entry
structure plus all individual matches/watchers/targets) is same
value that userspace gave us as the offset of the next entry.
Reported-by: syzbot+f68108fed972453a0ad4@syzkaller.appspotmail.com
Fixes: 81e675c227 ("netfilter: ebtables: add CONFIG_COMPAT support")
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Ondrej Mosnacek