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[PULL 11/26] linux-user/x86_64: Raise SIGSEGV if SA_RESTORER not set
From: |
Laurent Vivier |
Subject: |
[PULL 11/26] linux-user/x86_64: Raise SIGSEGV if SA_RESTORER not set |
Date: |
Mon, 4 Oct 2021 09:44:06 +0200 |
From: Richard Henderson <richard.henderson@linaro.org>
This has been a fixme for some time. The effect of
returning -EFAULT from the kernel code is to raise SIGSEGV.
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20210929130553.121567-12-richard.henderson@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
---
linux-user/i386/signal.c | 11 +++++------
1 file changed, 5 insertions(+), 6 deletions(-)
diff --git a/linux-user/i386/signal.c b/linux-user/i386/signal.c
index b38b5f108eaf..433efa3d693b 100644
--- a/linux-user/i386/signal.c
+++ b/linux-user/i386/signal.c
@@ -421,19 +421,18 @@ void setup_rt_frame(int sig, struct target_sigaction *ka,
/* Set up to return from userspace. If provided, use a stub
already in userspace. */
-#ifndef TARGET_X86_64
if (ka->sa_flags & TARGET_SA_RESTORER) {
__put_user(ka->sa_restorer, &frame->pretcode);
} else {
+#ifdef TARGET_X86_64
+ /* For x86_64, SA_RESTORER is required ABI. */
+ goto give_sigsegv;
+#else
/* This is no longer used, but is retained for ABI compatibility. */
install_rt_sigtramp(frame->retcode);
__put_user(default_rt_sigreturn, &frame->pretcode);
- }
-#else
- /* XXX: Would be slightly better to return -EFAULT here if test fails
- assert(ka->sa_flags & TARGET_SA_RESTORER); */
- __put_user(ka->sa_restorer, &frame->pretcode);
#endif
+ }
/* Set up registers for signal handler */
env->regs[R_ESP] = frame_addr;
--
2.31.1
- [PULL 00/26] Linux user for 6.2 patches, Laurent Vivier, 2021/10/04
- [PULL 05/26] linux-user/arm: Implement setup_sigtramp, Laurent Vivier, 2021/10/04
- [PULL 11/26] linux-user/x86_64: Raise SIGSEGV if SA_RESTORER not set,
Laurent Vivier <=
- [PULL 01/26] linux-user: Add infrastructure for a signal trampoline page, Laurent Vivier, 2021/10/04
- [PULL 16/26] linux-user/nios2: Document non-use of setup_sigtramp, Laurent Vivier, 2021/10/04
- [PULL 14/26] linux-user/mips: Tidy install_sigtramp, Laurent Vivier, 2021/10/04
- [PULL 04/26] linux-user/arm: Drop "_v2" from symbols in signal.c, Laurent Vivier, 2021/10/04
- [PULL 19/26] linux-user/ppc: Implement setup_sigtramp, Laurent Vivier, 2021/10/04
- [PULL 02/26] linux-user/aarch64: Implement setup_sigtramp, Laurent Vivier, 2021/10/04
- [PULL 03/26] linux-user/arm: Drop v1 signal frames, Laurent Vivier, 2021/10/04
- [PULL 15/26] linux-user/mips: Implement setup_sigtramp, Laurent Vivier, 2021/10/04
- [PULL 07/26] linux-user/cris: Implement setup_sigtramp, Laurent Vivier, 2021/10/04
- [PULL 06/26] linux-user/alpha: Implement setup_sigtramp, Laurent Vivier, 2021/10/04