Jamie Iles 2d39b3cd34 signal: protect SIGNAL_UNKILLABLE from unintentional clearing. ... Since commit 00cd5c37af ("ptrace: permit ptracing of /sbin/init") we can now trace init processes. init is initially protected with SIGNAL_UNKILLABLE which will prevent fatal signals such as SIGSTOP, but there are a number of paths during tracing where SIGNAL_UNKILLABLE can be implicitly cleared. This can result in init becoming stoppable/killable after tracing. For example, running: while true; do kill -STOP 1; done & strace -p 1 and then stopping strace and the kill loop will result in init being left in state TASK_STOPPED. Sending SIGCONT to init will resume it, but init will now respond to future SIGSTOP signals rather than ignoring them. Make sure that when setting SIGNAL_STOP_CONTINUED/SIGNAL_STOP_STOPPED that we don't clear SIGNAL_UNKILLABLE. Link: http://lkml.kernel.org/r/20170104122017.25047-1-jamie.iles@oracle.com Signed-off-by: Jamie Iles <jamie.iles@oracle.com> Acked-by: Oleg Nesterov <oleg@redhat.com> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Ingo Molnar <mingo@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2017-01-10 18:31:55 -08:00
..
acpi	More ACPI updates for v4.10-rc1	2016-12-22 10:19:32 -08:00
asm-generic	asm-prototypes: Clear any CPP defines before declaring the functions	2017-01-05 12:57:42 +01:00
clocksource
crypto	This pull contains one set of changes: a conversion of the crypto DocBook	2016-12-17 16:00:34 -08:00
drm	Replace <asm/uaccess.h> with <linux/uaccess.h> globally	2016-12-24 11:46:01 -08:00
dt-bindings	dt-bindings: mfd: Remove TPS65217 interrupts	2016-12-27 10:06:00 -08:00
keys
kvm	clocksource: Use a plain u64 instead of cycle_t	2016-12-25 11:04:12 +01:00
linux	signal: protect SIGNAL_UNKILLABLE from unintentional clearing.	2017-01-10 18:31:55 -08:00
math-emu
media
memory
misc
net	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2016-12-27 16:04:37 -08:00
pcmcia
ras
rdma	Replace <asm/uaccess.h> with <linux/uaccess.h> globally	2016-12-24 11:46:01 -08:00
rxrpc
scsi	linux: drop __bitwise__ everywhere	2016-12-16 00:13:41 +02:00
soc	powerpc updates for 4.10	2016-12-16 09:26:42 -08:00
sound	sound updates for 4.10-rc1	2016-12-14 11:14:28 -08:00
target	Merge branch 'scsi-target-for-v4.10' of git://git.kernel.org/pub/scm/linux/kernel/git/bvanassche/linux	2016-12-21 10:16:05 -08:00
trace	mm: get rid of __GFP_OTHER_NODE	2017-01-10 18:31:55 -08:00
uapi	usb: gadget: f_fs: Document eventfd effect on descriptor format.	2017-01-02 10:55:28 +02:00
video
xen	xen: features and fixes for 4.10 rc0	2016-12-13 16:07:55 -08:00
Kbuild