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| author |   Peter Zijlstra <peterz@infradead.org> | 2014-01-10 21:06:03 +0100 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2014-01-16 09:19:48 +0100 |
| commit | c026b3591e4f2a4993df773183704bb31634e0bd (patch) | |
| tree | 2115229bf8310f0f66d7d924e01865bee4af6911 /arch/x86/kernel/cpu/perf_event_amd_ibs.c | |
| parent | Merge branches 'sched-urgent-for-linus' and 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip (diff) | |
| download | linux-dev-c026b3591e4f2a4993df773183704bb31634e0bd.tar.xz linux-dev-c026b3591e4f2a4993df773183704bb31634e0bd.zip | |
x86, mm, perf: Allow recursive faults from interrupts
Waiman managed to trigger a PMI while in a emulate_vsyscall() fault,
the PMI in turn managed to trigger a fault while obtaining a stack
trace. This triggered the sig_on_uaccess_error recursive fault logic
and killed the process dead.
Fix this by explicitly excluding interrupts from the recursive fault
logic.
Reported-and-Tested-by: Waiman Long <waiman.long@hp.com>
Fixes: e00b12e64be9 ("perf/x86: Further optimize copy_from_user_nmi()")
Cc: Aswin Chandramouleeswaran <aswin@hp.com>
Cc: Scott J Norton <scott.norton@hp.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20140110200603.GJ7572@laptop.programming.kicks-ass.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to '')
0 files changed, 0 insertions, 0 deletions