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linux-user: Use target_restore_altstack in all sigreturn

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Note that target_restore_altstack uses the host memory
pointer that we have already verified, so TARGET_EFAULT
is not a possible return value.

Note that using -EFAULT was a bug.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20210426025334.1168495-3-richard.henderson@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Richard Henderson 2021-04-25 19:53:11 -07:00 • committed by Laurent Vivier
parent 92bad94836
commit 56384cf3ad
16 changed files with 18 additions and 81 deletions
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5
linux-user/i386/signal.c
View file

@ -581,10 +581,7 @@ long do_rt_sigreturn(CPUX86State *env)
goto badframe;
}
if (do_sigaltstack(frame_addr + offsetof(struct rt_sigframe, uc.tuc_stack), 0,
get_sp_from_cpustate(env)) == -EFAULT) {
goto badframe;
}
target_restore_altstack(&frame->uc.tuc_stack, get_sp_from_cpustate(env));
unlock_user_struct(frame, frame_addr, 0);
return -TARGET_QEMU_ESIGRETURN;