https://github.com/torvalds/linux
Revision 12ca6ad2e3a896256f086497a7c7406a547ee373 authored by Peter Zijlstra on 15 December 2015, 12:49:05 UTC, committed by Ingo Molnar on 06 January 2016, 09:52:39 UTC
There's a race on CPU unplug where we free the swevent hash array while it can still have events on. This will result in a use-after-free which is BAD. Simply do not free the hash array on unplug. This leaves the thing around and no use-after-free takes place. When the last swevent dies, we do a for_each_possible_cpu() iteration anyway to clean these up, at which time we'll free it, so no leakage will occur. Reported-by: Sasha Levin <sasha.levin@oracle.com> Tested-by: Sasha Levin <sasha.levin@oracle.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vince Weaver <vincent.weaver@maine.edu> Signed-off-by: Ingo Molnar <mingo@kernel.org>
1 parent c127449
Tip revision: 12ca6ad2e3a896256f086497a7c7406a547ee373 authored by Peter Zijlstra on 15 December 2015, 12:49:05 UTC
perf: Fix race in swevent hash
perf: Fix race in swevent hash
Tip revision: 12ca6ad
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