arm64/gcs: Fix error handling in arch_set_shadow_stack_status()

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[ Upstream commit 53c998527f ]

alloc_gcs() returns an error-encoded pointer on failure, which comes
from do_mmap(), not NULL.

The current NULL check fails to detect errors, which could lead to using
an invalid GCS address.

Use IS_ERR_VALUE() to properly detect errors, consistent with the
check in gcs_alloc_thread_stack().

Fixes: b57180c75c ("arm64/gcs: Implement shadow stack prctl() interface")
Reviewed-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Breno Leitao <leitao@debian.org>
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Breno Leitao 2026-02-02 10:32:51 -08:00 • committed by Greg Kroah-Hartman

parent 1141301a71

commit c787a235de

1 changed files with 2 additions and 2 deletions

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arch/arm64/mm/gcs.c

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