powerpc/livepatch: relax reliable stack tracer checks for first-frame

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The bottom-most stack frame (the first to be unwound) may be largely
uninitialized, for the "Power Architecture 64-Bit ELF V2 ABI" only
requires its backchain pointer to be set.

The reliable stack tracer should be careful when verifying this frame:
skip checks on STACK_FRAME_LR_SAVE and STACK_FRAME_MARKER offsets that
may contain uninitialized residual data.

Fixes: df78d3f614 ("powerpc/livepatch: Implement reliable stack tracing for the consistency model")
Signed-off-by: Joe Lawrence <joe.lawrence@redhat.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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Joe Lawrence 2019-01-22 10:57:22 -05:00 • committed by Michael Ellerman

parent a50d3250d7

commit 18be37603d

1 changed files with 24 additions and 8 deletions

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arch/powerpc/kernel/stacktrace.c

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