android_kernel_google_msm/kernel
Andrey Vagin 5f83d0f802 BACKPORT: signal: allow to send any siginfo to itself
(cherry picked from commit 66dd34ad31)

The idea is simple.  We need to get the siginfo for each signal on
checkpointing dump, and then return it back on restore.

The first problem is that the kernel doesn't report complete siginfos to
userspace.  In a signal handler the kernel strips SI_CODE from siginfo.
When a siginfo is received from signalfd, it has a different format with
fixed sizes of fields.  The interface of signalfd was extended.  If a
signalfd is created with the flag SFD_RAW, it returns siginfo in a raw
format.

rt_sigqueueinfo looks suitable for restoring signals, but it can't send
siginfo with a positive si_code, because these codes are reserved for
the kernel.  In the real world each person has right to do anything with
himself, so I think a process should able to send any siginfo to itself.

This patch:

The kernel prevents sending of siginfo with positive si_code, because
these codes are reserved for kernel.  I think we can allow a task to
send such a siginfo to itself.  This operation should not be dangerous.

This functionality is required for restoring signals in
checkpoint/restart.

Change-Id: I40101d87eeb53ae05cfa0949439577a8f3f58f94
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Cc: Serge Hallyn <serge.hallyn@canonical.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Michael Kerrisk <mtk.manpages@gmail.com>
Cc: Pavel Emelyanov <xemul@parallels.com>
Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Michael Kerrisk <mtk.manpages@gmail.com>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2017-12-27 22:49:08 +03:00
..
debug Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1 2017-12-27 17:13:15 +03:00
events Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1 2017-12-27 17:13:15 +03:00
gcov
irq Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1 2017-12-27 17:13:15 +03:00
power Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1 2017-12-27 17:13:15 +03:00
sched Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1 2017-12-27 17:13:15 +03:00
time Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1 2017-12-27 17:13:15 +03:00
trace Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1 2017-12-27 17:13:15 +03:00
.gitignore kernel/hz.bc: ignore. 2016-10-29 23:12:15 +08:00
acct.c
async.c Fix a dead loop in async_synchronize_full() 2012-10-02 10:30:35 -07:00
audit.c audit: wait_for_auditd() should use TASK_UNINTERRUPTIBLE 2014-04-14 06:44:15 -07:00
audit.h
audit_tree.c Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1 2017-12-27 17:13:15 +03:00
audit_watch.c get rid of kern_path_parent() 2017-09-22 19:11:54 +03:00
auditfilter.c
auditsc.c Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1 2017-12-27 17:13:15 +03:00
backtracetest.c
bounds.c
capability.c
cgroup.c Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1 2017-12-27 17:13:15 +03:00
cgroup_freezer.c cgroup: cgroup_subsys->fork() should be called after the task is added to css_set 2014-03-11 16:10:03 -07:00
compat.c compat: Fix RT signal mask corruption via sigprocmask 2012-05-10 08:58:33 -07:00
configs.c
cpu.c Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1 2017-12-27 17:13:15 +03:00
cpu_pm.c
cpuset.c cpuset: PF_SPREAD_PAGE and PF_SPREAD_SLAB should be atomic flags 2014-12-01 18:02:38 +08:00
crash_dump.c
cred.c cred: copy_process() should clear child->replacement_session_keyring 2012-04-11 08:20:11 -07:00
delayacct.c
dma.c Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
elfcore.c
exec_domain.c ANDROID: exec_domains: Disable request_module() call for personalities 2017-12-27 22:46:26 +03:00
exit.c Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1 2017-12-27 17:13:15 +03:00
extable.c
fork.c seccomp: Replace BUG(!spin_is_locked()) with assert_spin_lock 2017-12-27 22:42:09 +03:00
freezer.c Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1 2017-12-27 17:13:15 +03:00
futex.c Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1 2017-12-27 17:13:15 +03:00
futex_compat.c futex: Revert "futex: Mark get_robust_list as deprecated" 2013-02-28 06:59:01 -08:00
groups.c
hrtimer.c Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1 2017-12-27 17:13:15 +03:00
hung_task.c hung_task: fix the broken rcu_lock_break() logic 2012-03-05 15:49:42 -08:00
irq_work.c irq_work: fix compile failure on tile from missing include 2012-04-13 13:15:16 -04:00
itimer.c itimer: Use printk_once instead of WARN_ONCE 2012-04-10 11:00:30 +02:00
jump_label.c static keys: Inline the static_key_enabled() function 2012-02-28 20:01:08 +01:00
kallsyms.c vsprintf: Fix %ps on non symbols when using kallsyms 2013-02-08 15:14:22 -08:00
Kconfig.freezer
Kconfig.hz
Kconfig.locks locking/kconfig: Simplify INLINE_SPIN_UNLOCK usage 2012-03-23 13:18:57 +01:00
Kconfig.preempt locking/kconfig: Simplify INLINE_SPIN_UNLOCK usage 2012-03-23 13:18:57 +01:00
kexec.c Merge branch 'akpm' (Andrew's patch-bomb) 2012-03-28 17:19:28 -07:00
kfifo.c
kmod.c usermodehelper: check subprocess_info->path != NULL 2013-05-19 10:54:50 -07:00
kprobes.c kprobes: return proper error code from register_kprobe() 2012-03-05 15:49:42 -08:00
ksysfs.c rcu: Add a module parameter to force use of expedited RCU primitives 2016-10-29 23:12:17 +08:00
kthread.c Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1 2017-12-27 17:13:15 +03:00
latencytop.c
lglock.c brlocks/lglocks: turn into functions 2015-07-13 11:17:40 -07:00
lockdep.c lockdep: remove task argument from debug_check_no_locks_held 2013-07-12 14:22:56 -07:00
lockdep_internals.h
lockdep_proc.c
lockdep_states.h
Makefile hotplug: Fix UP bug in smpboot hotplug code 2016-10-29 23:12:39 +08:00
module.c module: Fix locking in symbol_put_addr() 2016-04-27 18:55:19 +08:00
mutex-debug.c
mutex-debug.h
mutex.c sched/rt: Use schedule_preempt_disabled() 2012-03-01 10:28:03 +01:00
mutex.h
notifier.c
nsproxy.c userns: make each net (net_ns) belong to a user_ns 2017-09-01 13:38:07 +03:00
padata.c padata: Fix cpu hotplug 2012-03-29 19:52:46 +08:00
panic.c Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1 2017-12-27 17:13:15 +03:00
params.c params: <level>_initcall-like kernel parameters 2012-03-26 12:50:51 +10:30
pid.c proc: Usable inode numbers for the namespace file descriptors. 2015-07-13 11:18:01 -07:00
pid_namespace.c proc: Usable inode numbers for the namespace file descriptors. 2015-07-13 11:18:01 -07:00
posix-cpu-timers.c posix-cpu-timers: Fix nanosleep task_struct leak 2013-02-28 06:58:59 -08:00
posix-timers.c posix-timers: Fix stack info leak in timer_create() 2015-02-02 17:05:05 +08:00
printk.c Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1 2017-12-27 17:13:15 +03:00
profile.c
ptrace.c Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1 2017-12-27 17:13:15 +03:00
range.c
rcu.h rcu: Add a module parameter to force use of expedited RCU primitives 2016-10-29 23:12:17 +08:00
rcupdate.c rcu: Make exit_rcu() more precise and consolidate 2016-10-29 23:12:17 +08:00
rcutiny.c rcu: Correctly handle non-empty Tiny RCU callback list with none ready 2015-10-22 09:20:02 +08:00
rcutiny_plugin.h rcu: Make exit_rcu() more precise and consolidate 2016-10-29 23:12:17 +08:00
rcutorture.c PTR_ERR should be called before its argument is cleared. 2012-02-21 09:06:10 -08:00
rcutree.c rcu: Use smp_hotplug_thread facility for RCUs per-CPU kthread 2016-10-29 23:12:39 +08:00
rcutree.h rcu: Use smp_hotplug_thread facility for RCUs per-CPU kthread 2016-10-29 23:12:39 +08:00
rcutree_plugin.h rcu: Use smp_hotplug_thread facility for RCUs per-CPU kthread 2016-10-29 23:12:39 +08:00
rcutree_trace.c rcu: Use smp_hotplug_thread facility for RCUs per-CPU kthread 2016-10-29 23:12:39 +08:00
relay.c splice: fix racy pipe->buffers uses 2012-07-16 09:04:42 -07:00
res_counter.c
resource.c Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1 2017-12-27 17:13:15 +03:00
rtmutex-debug.c
rtmutex-debug.h rtmutex: Handle deadlock detection smarter 2014-07-17 15:39:50 -07:00
rtmutex-tester.c
rtmutex.c rtmutex: Plug slow unlock race 2014-07-17 15:39:50 -07:00
rtmutex.h rtmutex: Handle deadlock detection smarter 2014-07-17 15:39:50 -07:00
rtmutex_common.h
rwsem.c Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
seccomp.c seccomp: Replace BUG(!spin_is_locked()) with assert_spin_lock 2017-12-27 22:42:09 +03:00
semaphore.c
signal.c BACKPORT: signal: allow to send any siginfo to itself 2017-12-27 22:49:08 +03:00
smp.c Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1 2017-12-27 17:13:15 +03:00
smpboot.c smpboot: use kmemleak_not_leak for smpboot_thread_data 2016-10-29 23:12:40 +08:00
smpboot.h smpboot: Provide infrastructure for percpu hotplug threads 2016-10-29 23:12:39 +08:00
softirq.c Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1 2017-12-27 17:13:15 +03:00
spinlock.c locking/kconfig: Simplify INLINE_SPIN_UNLOCK usage 2012-03-23 13:18:57 +01:00
srcu.c rcu: Call out dangers of expedited RCU primitives 2012-02-21 09:06:08 -08:00
stacktrace.c
stop_machine.c stop_machine: Mark per cpu stopper enabled early 2016-10-29 23:12:39 +08:00
sys.c Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1 2017-12-27 17:13:15 +03:00
sys_ni.c seccomp: add "seccomp" syscall 2014-10-31 19:46:27 -07:00
sysctl.c Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1 2017-12-27 17:13:15 +03:00
sysctl_binary.c Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1 2017-12-27 17:13:15 +03:00
taskstats.c
test_kprobes.c
time.c jiffies: Fix timeval conversion to jiffies 2016-10-29 23:12:15 +08:00
timeconst.bc kernel: Replace timeconst.pl with a bc script 2016-10-29 23:12:15 +08:00
timer.c tick: Upstream fixes 2017-08-25 20:00:22 +03:00
tracepoint.c tracepoint: Do not waste memory on mods with no tracepoints 2014-05-18 05:25:56 -07:00
tsacct.c
uid16.c
up.c
user-return-notifier.c
user.c proc: Usable inode numbers for the namespace file descriptors. 2015-07-13 11:18:01 -07:00
user_namespace.c proc: Usable inode numbers for the namespace file descriptors. 2015-07-13 11:18:01 -07:00
utsname.c proc: Usable inode numbers for the namespace file descriptors. 2015-07-13 11:18:01 -07:00
utsname_sysctl.c
wait.c
watchdog.c kernel/watchdog.c: touch_nmi_watchdog should only touch local cpu not every one 2016-03-21 09:17:57 +08:00
workqueue.c Merge remote-tracking branch 'stable/linux-3.4.y' into lineage-15.1 2017-12-27 17:13:15 +03:00
workqueue_sched.h