Jann Horn d774bd27b4 ptrace: restore smp_rmb() in __ptrace_may_access() ...

commit f6581f5b55 upstream.

Restore the read memory barrier in __ptrace_may_access() that was deleted
a couple years ago. Also add comments on this barrier and the one it pairs
with to explain why they're there (as far as I understand).

Fixes: bfedb58925 ("mm: Add a user_ns owner to mm_struct and fix ptrace permission checks")
Cc: stable@vger.kernel.org
Acked-by: Kees Cook <keescook@chromium.org>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Jann Horn <jannh@google.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2019-06-22 08:18:22 +02:00

..

bpf

bpf: Prevent memory disambiguation attack

2018-12-17 21:55:15 +01:00

configs

kconfig: tinyconfig: provide whole choice blocks to avoid warnings

2016-09-24 10:07:42 +02:00

debug

kdb: use memmove instead of overlapping memcpy

2018-12-13 09:21:29 +01:00

events

perf/core: Restore mmap record type correctly

2019-04-27 09:33:56 +02:00

gcov

gcov: disable for COMPILE_TEST

2018-01-23 19:50:10 +01:00

irq

genirq: Prevent use-after-free and work list corruption

2019-05-16 19:45:04 +02:00

livepatch

livepatch: x86: fix relocation computation with kASLR

2015-11-11 17:36:04 +01:00

locking

Revert "locking/lockdep: Add debug_locks check in __lock_downgrade()"

2019-04-27 09:34:02 +02:00

power

PM / Hibernate: Call flush_icache_range() on pages restored in-place

2019-04-03 06:23:24 +02:00

printk

printk: Fix panic caused by passing log_buf_len to command line

2018-11-21 09:27:35 +01:00

rcu

rcutorture: Fix cleanup path for invalid torture_type strings

2019-06-11 12:24:04 +02:00

sched

sched/core: Handle overflow in cpu_shares_write_u64

2019-06-11 12:23:58 +02:00

time

ntp: Allow TAI-UTC offset to be set to zero

2019-06-22 08:18:19 +02:00

trace

tracing: Fix partial reading of trace event's id file

2019-06-11 12:23:46 +02:00

.gitignore

certs: add .gitignore to stop git nagging about x509_certificate_list

2015-10-21 15:18:35 +01:00

acct.c

kernel/acct.c: fix the acct->needcheck check in check_free_space()

2018-01-10 09:27:08 +01:00

async.c

kernel/async.c: revert "async: simplify lowest_in_progress()"

2018-02-16 20:09:45 +01:00

audit_fsnotify.c

audit: clean simple fsnotify implementation

2015-08-06 16:14:53 -04:00

audit_tree.c

audit: audit_tree_match can be boolean

2015-11-04 08:23:51 -05:00

audit_watch.c

audit: fix use-after-free in audit_add_watch

2018-09-26 08:35:08 +02:00

audit.c

audit: return on memory error to avoid null pointer dereference

2018-05-30 07:49:16 +02:00

audit.h

audit: audit_tree_match can be boolean

2015-11-04 08:23:51 -05:00

auditfilter.c

audit: fix a memory leak bug

2019-06-11 12:23:58 +02:00

auditsc.c

audit: allow not equal op for audit by executable

2018-08-06 16:24:38 +02:00

backtracetest.c

…

bounds.c

kbuild: fix kernel/bounds.c 'W=1' warning

2018-11-21 09:27:35 +01:00

capability.c

exec: Ensure mm->user_ns contains the execed files

2017-01-06 11:16:14 +01:00

cgroup_freezer.c

cgroup: fix handling of multi-destination migration from subtree_control enabling

2015-12-03 10:18:21 -05:00

cgroup_pids.c

cgroup_pids: don't account for the root cgroup

2015-12-03 10:18:21 -05:00

cgroup.c

cgroup: Fix deadlock in cpu hotplug path

2018-10-13 09:11:33 +02:00

compat.c

compat: cleanup coding in compat_get_bitmap() and compat_put_bitmap()

2015-06-04 23:57:18 +02:00

configs.c

…

context_tracking.c

context_tracking: avoid irq_save/irq_restore on guest entry and exit

2015-11-10 12:06:23 +01:00

cpu_pm.c

kernel/cpu_pm: fix cpu_cluster_pm_exit comment

2015-09-03 02:42:20 +02:00

cpu.c

cpu/speculation: Add 'mitigations=' cmdline option

2019-05-16 19:45:15 +02:00

cpuset.c

sched/cpuset/pm: Fix cpuset vs. suspend-resume bugs

2017-10-12 11:27:35 +02:00

crash_dump.c

…

cred.c

ptrace: restore smp_rmb() in __ptrace_may_access()

2019-06-22 08:18:22 +02:00

delayacct.c

…

dma.c

…

elfcore.c

…

exec_domain.c

Remove rest of exec domains.

2015-04-12 21:03:31 +02:00

exit.c

kernel/exit.c: release ptraced tasks before zap_pid_ns_processes

2019-02-06 19:43:07 +01:00

extable.c

kernel/extable.c: mark core_kernel_text notrace

2017-07-21 07:44:56 +02:00

fork.c

fork: record start_time late

2019-01-13 10:05:32 +01:00

freezer.c

…

futex_compat.c

ptrace: use fsuid, fsgid, effective creds for fs access checks

2016-02-25 12:01:16 -08:00

futex.c

futex: Fix futex lock the wrong page

2019-06-22 08:18:22 +02:00

groups.c

kernel: make groups_sort calling a responsibility group_info allocators

2018-01-10 09:27:10 +01:00

hung_task.c

kernel/hung_task.c: break RCU locks based on jiffies

2019-02-20 10:13:14 +01:00

irq_work.c

treewide: Remove old email address

2015-11-23 09:44:58 +01:00

jump_label.c

jump_label: Invoke jump_label_test() via early_initcall()

2017-12-16 10:33:55 +01:00

kallsyms.c

…

kcmp.c

ptrace: use fsuid, fsgid, effective creds for fs access checks

2016-02-25 12:01:16 -08:00

Kconfig.freezer

…

Kconfig.hz

…

Kconfig.locks

locking/qrwlock: Rename QUEUE_RWLOCK to QUEUED_RWLOCKS

2015-05-12 09:46:00 +02:00

Kconfig.preempt

…

kexec_core.c

kexec: use file name as the output message prefix

2015-11-06 17:50:42 -08:00

kexec_file.c

kexec: fix double-free when failing to relocate the purgatory

2016-09-24 10:07:36 +02:00

kexec_internal.h

kexec: split kexec_file syscall code to kexec_file.c

2015-09-10 13:29:01 -07:00

kexec.c

kexec: use file name as the output message prefix

2015-11-06 17:50:42 -08:00

kmod.c

kmod: don't run async usermode helper as a child of kworker thread

2015-10-23 17:55:10 +09:00

kprobes.c

kprobes: Fix error check when reusing optimized probes

2019-04-27 09:34:02 +02:00

ksysfs.c

kexec: split kexec_load syscall from kexec core code

2015-09-10 13:29:01 -07:00

kthread.c

kthread, tracing: Don't expose half-written comm when creating kthreads

2018-09-09 20:04:34 +02:00

latencytop.c

…

Makefile

sys_membarrier(): system-wide memory barrier (generic, x86)

2015-09-11 15:21:34 -07:00

membarrier.c

Fix: Disable sys_membarrier when nohz_full is enabled

2017-03-12 06:37:26 +01:00

memremap.c

mm, devm_memremap_pages: kill mapping "System RAM" support

2019-01-13 10:05:32 +01:00

module_signing.c

KEYS: Merge the type-specific data with the payload data

2015-10-21 15:18:36 +01:00

module-internal.h

…

module.c

module: exclude SHN_UNDEF symbols from kallsyms api

2018-10-10 08:52:07 +02:00

notifier.c

Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2015-09-01 08:40:25 -07:00

nsproxy.c

…

padata.c

padata: free correct variable

2017-05-20 14:27:02 +02:00

panic.c

kernel/panic.c: add missing \n

2017-07-05 14:37:19 +02:00

params.c

Merge tag 'modules-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux

2015-11-09 15:53:39 -08:00

pid_namespace.c

pid_ns: Sleep in TASK_INTERRUPTIBLE in zap_pid_ns_processes

2017-05-25 14:30:11 +02:00

pid.c

pidns: disable pid allocation if pid_ns_prepare_proc() is failed in alloc_pid()

2018-04-13 19:50:03 +02:00

profile.c

profile: hide unused functions when !CONFIG_PROC_FS

2018-02-25 11:03:44 +01:00

ptrace.c

ptrace: restore smp_rmb() in __ptrace_may_access()

2019-06-22 08:18:22 +02:00

range.c

…

reboot.c

kexec: split kexec_load syscall from kexec core code

2015-09-10 13:29:01 -07:00

relay.c

kernel/relay.c: limit kmalloc size to KMALLOC_MAX_SIZE

2018-05-30 07:49:00 +02:00

resource.c

resource: fix integer overflow at reallocation

2018-04-24 09:32:05 +02:00

seccomp.c

seccomp: Move speculation migitation control to arch code

2018-07-25 10:18:27 +02:00

signal.c

kernel/signal.c: trace_signal_deliver when signal_group_exit

2019-06-11 12:24:10 +02:00

smp.c

mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd

2015-11-06 17:50:42 -08:00

smpboot.c

stop_machine: Kill smp_hotplug_thread->pre_unpark, introduce stop_machine_unpark()

2015-10-20 10:23:55 +02:00

smpboot.h

…

softirq.c

…

stacktrace.c

…

stop_machine.c

kernel: remove stop_machine() Kconfig dependency

2015-12-12 10:15:34 -08:00

sys_ni.c

mm: mlock: add new mlock system call

2015-11-05 19:34:48 -08:00

sys.c

kernel/sys.c: prctl: fix false positive in validate_prctl_map()

2019-06-22 08:18:18 +02:00

sysctl_binary.c

fs/coredump: prevent fsuid=0 dumps into user-controlled directories

2016-04-12 09:08:58 -07:00

sysctl.c

sysctl: return -EINVAL if val violates minmax

2019-06-22 08:18:17 +02:00

task_work.c

task_work: remove fifo ordering guarantee

2015-09-05 13:46:58 -07:00

taskstats.c

…

test_kprobes.c

…

torture.c

torture: Consolidate cond_resched_rcu_qs() into stutter_wait()

2015-10-06 11:25:01 -07:00

tracepoint.c

tracepoint: Do not warn on ENOMEM

2018-05-16 10:06:47 +02:00

tsacct.c

…

uid16.c

kernel: make groups_sort calling a responsibility group_info allocators

2018-01-10 09:27:10 +01:00

up.c

…

user_namespace.c

userns: move user access out of the mutex

2018-09-09 20:04:35 +02:00

user-return-notifier.c

…

user.c

…

utsname_sysctl.c

sys: don't hold uts_sem while accessing userspace memory

2018-09-09 20:04:35 +02:00

utsname.c

…

watchdog.c

kernel/watchdog: use nmi registers snapshot in hardlockup handler

2017-01-06 11:16:16 +01:00

workqueue_internal.h

workqueue: Fix NULL pointer dereference

2017-11-15 17:13:11 +01:00

workqueue.c

workqueue: use put_device() instead of kfree()

2018-05-30 07:49:04 +02:00