Tejun Heo 8c6fa0a671 ptrace,x86: force IRET path after a ptrace_stop() ... commit b9cd18de4d upstream. The 'sysret' fastpath does not correctly restore even all regular registers, much less any segment registers or reflags values. That is very much part of why it's faster than 'iret'. Normally that isn't a problem, because the normal ptrace() interface catches the process using the signal handler infrastructure, which always returns with an iret. However, some paths can get caught using ptrace_event() instead of the signal path, and for those we need to make sure that we aren't going to return to user space using 'sysret'. Otherwise the modifications that may have been done to the register set by the tracer wouldn't necessarily take effect. Fix it by forcing IRET path by setting TIF_NOTIFY_RESUME from arch_ptrace_stop_needed() which is invoked from ptrace_stop(). Signed-off-by: Tejun Heo <tj@kernel.org> Reported-by: Andy Lutomirski <luto@amacapital.net> Acked-by: Oleg Nesterov <oleg@redhat.com> Suggested-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2014-07-06 18:54:15 -07:00
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acpi	ACPI / hotplug: Fix conflicted PCI bridge notify handlers	2013-12-04 10:57:04 -08:00
asm-generic	mm: use paravirt friendly ops for NUMA hinting ptes	2014-05-30 21:52:12 -07:00
clocksource	clocksource: arch_timer: use virtual counters	2014-01-09 12:24:26 -08:00
crypto	crypto: scatterwalk - Use sg_chain_ptr on chain entries	2013-12-11 22:36:29 -08:00
drm	drm/radeon: 0x9649 is SUMO2 not SUMO	2014-01-09 12:24:22 -08:00
dt-bindings
keys
linux	ptrace,x86: force IRET path after a ptrace_stop()	2014-07-06 18:54:15 -07:00
math-emu
media	media: v4l2: added missing mutex.h include to v4l2-ctrls.h	2013-09-26 17:18:26 -07:00
memory
misc
net	net: fix inet_getid() and ipv6_select_ident() bugs	2014-06-26 15:12:38 -04:00
pcmcia
ras
rdma
rxrpc
scsi	scsi: fix our current target reap infrastructure	2014-05-30 21:52:11 -07:00
sound	ALSA: control: Protect user controls against concurrent access	2014-06-26 15:12:43 -04:00
target	target: Report correct response length for some commands	2014-06-30 20:09:45 -07:00
trace	trace: module: Maintain a valid user count	2014-06-07 13:25:35 -07:00
uapi	ALSA: compress: Cancel the optimization of compiler and fix the size of struct for all platform.	2014-06-26 15:12:41 -04:00
video	Merge branch 'fbdev-3.10-fixes' of git://gitorious.org/linux-omap-dss2/linux into linux-fbdev/for-3.10-fixes	2013-05-29 17:00:34 +08:00
xen	xenbus: delay xenbus frontend resume if xenstored is not running	2013-05-29 09:04:19 -04:00
Kbuild