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android_kernel_samsung_msm8976/kernel
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Eric W. Biederman 031a63b7a3 signal: Restore the stop PTRACE_EVENT_EXIT 
commit cf43a757fd49442bc38f76088b70c2299eed2c2f upstream.

In the middle of do_exit() there is there is a call
"ptrace_event(PTRACE_EVENT_EXIT, code);" That call places the process
in TACKED_TRACED aka "(TASK_WAKEKILL | __TASK_TRACED)" and waits for
for the debugger to release the task or SIGKILL to be delivered.

Skipping past dequeue_signal when we know a fatal signal has already
been delivered resulted in SIGKILL remaining pending and
TIF_SIGPENDING remaining set.  This in turn caused the
scheduler to not sleep in PTACE_EVENT_EXIT as it figured
a fatal signal was pending.  This also caused ptrace_freeze_traced
in ptrace_check_attach to fail because it left a per thread
SIGKILL pending which is what fatal_signal_pending tests for.

This difference in signal state caused strace to report
strace: Exit of unknown pid NNNNN ignored

Therefore update the signal handling state like dequeue_signal
would when removing a per thread SIGKILL, by removing SIGKILL
from the per thread signal mask and clearing TIF_SIGPENDING.

Acked-by: Oleg Nesterov <oleg@redhat.com>
Reported-by: Oleg Nesterov <oleg@redhat.com>
Reported-by: Ivan Delalande <colona@arista.com>
Fixes: 35634ffa1751 ("signal: Always notice exiting tasks")
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
 		2019-07-27 22:10:22 +02:00
..
cpu sched/idle: Add missing checks to the exit condition of cpu_idle_poll() 2019-07-27 21:50:45 +02:00
debug mm: per-thread vma caching 2019-07-27 22:08:06 +02:00
events perf/core: Fix impossible ring-buffer sizes warning 2019-07-27 22:10:22 +02:00
gcov
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irq This is the 3.10.99 stable release 2017-04-18 17:17:46 +02:00
locking locking/lockdep: Use for_each_process_thread() for debug_show_all_locks() 2019-07-27 22:09:22 +02:00
power PM: convert do_each_thread to for_each_process_thread 2019-07-27 22:09:18 +02:00
rcu rcu: Don't disable CPU hotplug during OOM notifiers 2016-01-06 23:11:06 -08:00
sched sched/fair: Limit sched_cfs_period_timer() loop to avoid hard lockup 2019-07-27 22:10:10 +02:00
time nohz: Fix local_timer_softirq_pending() 2019-07-27 21:52:58 +02:00
trace tracing: kdb: Fix ftdump to not sleep 2019-07-27 22:10:01 +02:00
.gitignore
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Kconfig.freezer
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Kconfig.hz
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Kconfig.locks Import latest Samsung release 2017-04-18 03:43:52 +02:00
Kconfig.preempt
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Makefile UPSTREAM: KEYS: Separate the kernel signature checking keyring from module signing 2016-05-18 14:36:10 +05:30
acct.c
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async.c kernel/async.c: revert "async: simplify lowest_in_progress()" 2019-07-27 21:49:48 +02:00
audit.c BACKPORT: audit: consistently record PIDs with task_tgid_nr() 2019-07-27 21:50:56 +02:00
audit.h Import latest Samsung release 2017-04-18 03:43:52 +02:00
audit_tree.c audit: keep inode pinned 2014-11-21 09:22:52 -08:00
audit_watch.c audit: fix use-after-free in audit_add_watch 2019-07-27 21:51:40 +02:00
auditfilter.c
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auditsc.c BACKPORT: audit: consistently record PIDs with task_tgid_nr() 2019-07-27 21:50:56 +02:00
backtracetest.c
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bounds.c
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capability.c
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cgroup.c cgroup: prefer %pK to %p 2016-12-06 09:24:09 -08:00
cgroup_freezer.c
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compat.c
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configs.c
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context_tracking.c
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cpu.c cpu: send KOBJ_ONLINE event when enabling cpus 2017-07-24 01:09:04 -07:00
cpu_pm.c cpu_pm: Add level to the cluster pm notification 2015-01-07 22:31:58 -08:00
cpuset.c sched/cpuset/pm: Fix cpuset vs. suspend-resume bugs 2019-07-27 22:08:19 +02:00
crash_dump.c
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cred.c
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delayacct.c
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dma.c
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elfcore.c
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exec_domain.c ANDROID: exec_domains: Disable request_module() call for personalities 2016-05-18 14:34:40 +05:30
exit.c wait/ptrace: assume __WALL if the child is traced 2019-07-27 22:09:56 +02:00
extable.c kernel/extable.c: mark core_kernel_text notrace 2019-07-27 21:44:25 +02:00
fork.c Revert "android/lowmemorykiller: Ignore tasks with freed mm" 2019-07-27 22:09:48 +02:00
freezer.c freezer: set PF_SUSPEND_TASK flag on tasks that call freeze_processes 2019-07-27 22:09:18 +02:00
futex.c futex: Ensure that futex address is aligned in handle_futex_death() 2019-07-27 22:08:53 +02:00
futex_compat.c ptrace: use fsuid, fsgid, effective creds for fs access checks 2016-02-25 11:57:47 -08:00
groups.c kernel: make groups_sort calling a responsibility group_info allocators 2019-07-27 21:46:18 +02:00
hrtimer.c hrtimer: Ensure POSIX compliance (relative CLOCK_REALTIME hrtimers) 2019-07-27 21:49:51 +02:00
hung_task.c kernel/hung_task.c: change hung_task.c to use for_each_process_thread() 2019-07-27 22:09:21 +02:00
irq_work.c irq_work: Remove BUG_ON in irq_work_run() 2016-01-07 00:42:12 -08:00
itimer.c
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jump_label.c
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kallsyms.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
kcmp.c ptrace: use fsuid, fsgid, effective creds for fs access checks 2016-02-25 11:57:47 -08:00
kexec.c
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kmod.c
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kprobes.c
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ksysfs.c
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kthread.c kthread: Fix the race condition when kthread is parked 2015-06-04 17:43:41 -07:00
latencytop.c
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modsign_pubkey.c
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module-internal.h UPSTREAM: KEYS: Separate the kernel signature checking keyring from module signing 2016-05-18 14:36:10 +05:30
module.c module: Invalidate signatures on force-loaded modules 2019-07-27 21:42:00 +02:00
module_signing.c UPSTREAM: KEYS: Separate the kernel signature checking keyring from module signing 2016-05-18 14:36:10 +05:30
notifier.c
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nsproxy.c
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padata.c padata: avoid race in reordering 2019-07-27 21:44:05 +02:00
panic.c printk: do cond_resched() between lines while outputting to consoles 2019-07-27 21:41:46 +02:00
params.c kernel/params.c: align add_sysfs_param documentation with code 2019-07-27 21:45:35 +02:00
pid.c BACKPORT: FROMLIST: pids: make task_tgid_nr_ns() safe 2018-05-26 00:39:33 +02:00
pid_namespace.c
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posix-cpu-timers.c posix-timers: Sanitize overrun handling 2019-07-27 21:53:21 +02:00
posix-timers.c posix-timers: Sanitize overrun handling 2019-07-27 21:53:21 +02:00
printk.c printk: use rcuidle console tracepoint 2019-07-27 21:44:09 +02:00
profile.c
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ptrace.c ptrace: revert "Prepare to fix racy accesses on task breakpoints" 2019-07-27 22:09:55 +02:00
range.c
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relay.c treewide: Fix typo in Documentation/DocBook 2019-07-27 22:10:20 +02:00
res_counter.c
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resource.c /proc/iomem: only expose physical resource addresses to privileged users 2019-07-27 22:05:58 +02:00
seccomp.c UPSTREAM: seccomp: always propagate NO_NEW_PRIVS on tsync 2019-07-27 21:51:01 +02:00
signal.c signal: Restore the stop PTRACE_EVENT_EXIT 2019-07-27 22:10:22 +02:00
smp.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
smpboot.c smpboot: use kmemleak_not_leak for smpboot_thread_data 2015-05-11 17:07:29 +05:30
smpboot.h
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softirq.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
stacktrace.c
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stop_machine.c
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sys.c exit.c: unexport __set_special_pids() 2019-07-27 22:09:28 +02:00
sys_ni.c seccomp: add "seccomp" syscall 2015-03-19 14:52:50 -07:00
sysctl.c kernel/sysctl.c: fix out-of-bounds access when setting file-max 2019-07-27 22:10:11 +02:00
sysctl_binary.c
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system_certificates.S UPSTREAM: KEYS: Separate the kernel signature checking keyring from module signing 2016-05-18 14:36:10 +05:30
system_keyring.c UPSTREAM: KEYS: Separate the kernel signature checking keyring from module signing 2016-05-18 14:36:10 +05:30
task_work.c
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taskstats.c
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test_kprobes.c
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time.c time: Make sure jiffies_to_msecs() preserves non-zero time periods 2019-07-27 21:52:48 +02:00
timeconst.bc
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timer.c timers: Use proper base migration in add_timer_on() 2019-07-27 21:42:23 +02:00
tracepoint.c tracing: syscall_regfunc() should not skip kernel threads 2019-07-27 22:09:17 +02:00
tsacct.c
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uid16.c kernel: make groups_sort calling a responsibility group_info allocators 2019-07-27 21:46:18 +02:00
up.c
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user-return-notifier.c
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user.c userns: Add a knob to disable setgroups on a per user namespace basis 2015-01-08 09:58:16 -08:00
user_namespace.c userns: move user access out of the mutex 2019-07-27 21:51:26 +02:00
utsname.c
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utsname_sysctl.c
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watchdog.c
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workqueue.c workqueue: trigger WARN if queue_delayed_work() is called with NULL @wq 2019-07-27 21:45:23 +02:00
workqueue_internal.h
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