From: Richard Henderson <richard.henderson@linaro.org>
To: qemu-devel@nongnu.org
Cc: peter.maydell@linaro.org, laurent@vivier.eu
Subject: [PATCH v3 11/27] linux-user/x86_64: Raise SIGSEGV if SA_RESTORER not set
Date: Fri, 24 Sep 2021 12:59:10 -0400 [thread overview]
Message-ID: <20210924165926.752809-12-richard.henderson@linaro.org> (raw)
In-Reply-To: <20210924165926.752809-1-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.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
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 94ab6396a0..55a36476d1 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;
--
2.25.1
next prev parent reply other threads:[~2021-09-24 17:11 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-24 16:58 [PATCH v3 00/27] linux-user: Move signal trampolines to new page Richard Henderson
2021-09-24 16:59 ` [PATCH v3 01/27] linux-user: Add infrastructure for a signal trampoline page Richard Henderson
2021-09-24 16:59 ` [PATCH v3 02/27] linux-user/aarch64: Implement setup_sigtramp Richard Henderson
2021-09-24 16:59 ` [PATCH v3 03/27] linux-user/arm: Drop v1 signal frames Richard Henderson
2021-09-24 16:59 ` [PATCH v3 04/27] linux-user/arm: Drop "_v2" from symbols in signal.c Richard Henderson
2021-09-24 16:59 ` [PATCH v3 05/27] linux-user/arm: Implement setup_sigtramp Richard Henderson
2021-09-27 11:06 ` Peter Maydell
2021-09-24 16:59 ` [PATCH v3 06/27] linux-user/alpha: " Richard Henderson
2021-09-24 16:59 ` [PATCH v3 07/27] linux-user/cris: " Richard Henderson
2021-09-24 16:59 ` [PATCH v3 08/27] linux-user/hexagon: " Richard Henderson
2021-09-24 18:49 ` Taylor Simpson
2021-09-24 16:59 ` [PATCH v3 09/27] linux-user/hppa: Document non-use of setup_sigtramp Richard Henderson
2021-09-24 16:59 ` [PATCH v3 10/27] linux-user/i386: Implement setup_sigtramp Richard Henderson
2021-09-24 18:01 ` Philippe Mathieu-Daudé
2021-09-28 1:42 ` Richard Henderson
2021-09-28 6:50 ` Philippe Mathieu-Daudé
2021-09-24 16:59 ` Richard Henderson [this message]
2021-09-27 13:01 ` [PATCH v3 11/27] linux-user/x86_64: Raise SIGSEGV if SA_RESTORER not set Peter Maydell
2021-09-24 16:59 ` [PATCH v3 12/27] linux-user/m68k: Implement setup_sigtramp Richard Henderson
2021-09-24 16:59 ` [PATCH v3 13/27] linux-user/microblaze: " Richard Henderson
2021-09-24 16:59 ` [PATCH v3 14/27] linux-user/mips: Tidy install_sigtramp Richard Henderson
2021-09-24 16:59 ` [PATCH v3 15/27] linux-user/mips: Implement setup_sigtramp Richard Henderson
2021-09-24 16:59 ` [PATCH v3 16/27] linux-user/nios2: Properly emulate EXCP_TRAP Richard Henderson
2021-09-27 13:23 ` Peter Maydell
2021-09-27 14:30 ` Richard Henderson
2021-09-24 16:59 ` [PATCH v3 17/27] linux-user/nios2: Map a real kuser page Richard Henderson
2021-09-27 13:26 ` Peter Maydell
2021-09-27 13:59 ` Richard Henderson
2021-09-24 16:59 ` [PATCH v3 18/27] linux-user/nios2: Fixes for signal frame setup Richard Henderson
2021-09-27 13:28 ` Peter Maydell
2021-09-24 16:59 ` [PATCH v3 19/27] linux-user/openrisc: Implement setup_sigtramp Richard Henderson
2021-09-24 16:59 ` [PATCH v3 20/27] linux-user/ppc: Simplify encode_trampoline Richard Henderson
2021-09-24 17:55 ` Philippe Mathieu-Daudé
2021-09-24 16:59 ` [PATCH v3 21/27] linux-user/ppc: Implement setup_sigtramp Richard Henderson
2021-09-27 13:34 ` Peter Maydell
2021-09-24 16:59 ` [PATCH v3 22/27] linux-user/riscv: " Richard Henderson
2021-09-24 16:59 ` [PATCH v3 23/27] linux-user/s390x: " Richard Henderson
2021-09-24 16:59 ` [PATCH v3 24/27] linux-user/sh4: " Richard Henderson
2021-09-24 16:59 ` [PATCH v3 25/27] linux-user/sparc: " Richard Henderson
2021-09-27 13:30 ` Peter Maydell
2021-09-24 16:59 ` [PATCH v3 26/27] linux-user/xtensa: " Richard Henderson
2021-09-24 17:53 ` Philippe Mathieu-Daudé
2021-09-24 16:59 ` [PATCH v3 27/27] linux-user: Remove default for TARGET_ARCH_HAS_SIGTRAMP_PAGE Richard Henderson
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