arm64/signal: Raise limit on stack frames

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The signal code has a limit of 64K on the size of a stack frame that it
will generate, if this limit is exceeded then a process will be killed if
it receives a signal. Unfortunately with the advent of SME this limit is
too small - the maximum possible size of the ZA register alone is 64K. This
is not an issue for practical systems at present but is easily seen using
virtual platforms.

Raise the limit to 256K, this is substantially more than could be used by
any current architecture extension.

Signed-off-by: Mark Brown <broonie@kernel.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20220817182324.638214-2-broonie@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>

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Mark Brown 2022-08-17 19:23:21 +01:00 • committed by Will Deacon

parent 53d2d84a1f

commit 7ddcaf78e9

1 changed files with 1 additions and 1 deletions

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arch/arm64/kernel/signal.c

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