powerpc/perf: Prevent kernel address leak to userspace via BHRB buffer

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The current Branch History Rolling Buffer (BHRB) code does not check
for any privilege levels before updating the data from BHRB. This
could leak kernel addresses to userspace even when profiling only with
userspace privileges. Add proper checks to prevent it.

Acked-by: Balbir Singh <bsingharora@gmail.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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Madhavan Srinivasan 2018-03-21 17:10:25 +05:30 • committed by Michael Ellerman

parent e1ebd0e5b9

commit bb19af8160

1 changed files with 10 additions and 0 deletions

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arch/powerpc/perf/core-book3s.c

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