arm64/signal: Don't assume that TIF_SVE means we saved SVE state

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commit 61da7c8e2a upstream.

When we are in a syscall we will only save the FPSIMD subset even though
the task still has access to the full register set, and on context switch
we will only remove TIF_SVE when loading the register state. This means
that the signal handling code should not assume that TIF_SVE means that
the register state is stored in SVE format, it should instead check the
format that was recorded during save.

Fixes: 8c845e2731 ("arm64/sve: Leave SVE enabled on syscall if we don't context switch")
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20240130-arm64-sve-signal-regs-v2-1-9fc6f9502782@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Mark Brown 2024-01-30 15:43:53 +00:00 • committed by Greg Kroah-Hartman

parent 4796a1a413

commit 60480c6bc1

2 changed files with 3 additions and 3 deletions

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arch/arm64/kernel/fpsimd.c

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4

arch/arm64/kernel/signal.c

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