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arm64/signal: Restore TPIDR2 register rather than memory state

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Currently when restoring the TPIDR2 signal context we set the new value
from the signal frame in the thread data structure but not the register,
following the pattern for the rest of the data we are restoring. This does
not work in the case of TPIDR2, the register always has the value for the
current task. This means that either we return to userspace and ignore the
new value or we context switch and save the register value on top of the
newly restored value.

Load the value from the signal context into the register instead.

Fixes: 39e5449928 ("arm64/signal: Include TPIDR2 in the signal context")
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: <stable@vger.kernel.org> # 6.3.x
Link: https://lore.kernel.org/r/20230621-arm64-fix-tpidr2-signal-restore-v2-1-c8e8fcc10302@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Mark Brown
2023-06-22 14:39:45 +01:00
committed by Catalin Marinas
parent 44c026a73b
commit 616cb2f4b1
1 changed files with 1 additions and 1 deletions
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2
arch/arm64/kernel/signal.c
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@@ -398,7 +398,7 @@ static int restore_tpidr2_context(struct user_ctxs *user)
__get_user_error(tpidr2_el0, &user->tpidr2->tpidr2, err);
if (!err)
current->thread.tpidr2_el0 = tpidr2_el0;
write_sysreg_s(tpidr2_el0, SYS_TPIDR2_EL0);
return err;
}