arm64/signal: Expose GCS state in signal frames

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Add a context for the GCS state and include it in the signal context when
running on a system that supports GCS. We reuse the same flags that the
prctl() uses to specify which GCS features are enabled and also provide the
current GCS pointer.

We do not support enabling GCS via signal return, there is a conflict
between specifying GCSPR_EL0 and allocation of a new GCS and this is not
an ancticipated use case.  We also enforce GCS configuration locking on
signal return.

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Thiago Jung Bauermann <thiago.bauermann@linaro.org>
Acked-by: Yury Khrustalev <yury.khrustalev@arm.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20241001-arm64-gcs-v13-26-222b78d87eee@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

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Mark Brown 2024-10-01 23:59:05 +01:00 • committed by Catalin Marinas

parent eaf62ce156

commit 16f47bb9ac

2 changed files with 118 additions and 0 deletions

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9

arch/arm64/include/uapi/asm/sigcontext.h

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109

arch/arm64/kernel/signal.c

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