powerpc: Implement arch_within_stack_frames

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Walks the stack when copy_{to,from}_user address is in the stack to
ensure that the object being copied is entirely a single stack frame and
does not contain stack metadata.

Substantially similar to the x86 implementation. The back chain is used
to traverse the stack and identify stack frame boundaries.

Signed-off-by: Nicholas Miehlbradt <nicholas@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230228054355.300628-1-nicholas@linux.ibm.com

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Nicholas Miehlbradt 2023-02-28 05:43:55 +00:00 • committed by Michael Ellerman

parent 2500763dd3

commit ac9c8901cb

3 changed files with 47 additions and 0 deletions

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1

arch/powerpc/Kconfig

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8

arch/powerpc/include/asm/ppc_asm.h

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38

arch/powerpc/include/asm/thread_info.h

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