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| author | Sergey Bugaev <bugaevc@gmail.com> | 2023-05-15 11:33:21 +0300 |
|---|---|---|
| committer | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2023-05-16 16:08:58 +0200 |
| commit | ce96593c882b393461084048533120e9c1e9d328 (patch) | |
| tree | f1c5b0dd783019cfe0bfe6843bfbfeddfd282ba9 | |
| parent | ff0f87632a74a369a2b992f4436ae406065a4012 (diff) | |
| download | glibc-ce96593c882b393461084048533120e9c1e9d328.zip glibc-ce96593c882b393461084048533120e9c1e9d328.tar.gz glibc-ce96593c882b393461084048533120e9c1e9d328.tar.bz2 | |
hurd: Align signal stack pointer after allocating stackframe
sizeof (*stackframe) appears to be divisible by 16, but we should not
rely on that. So make sure to leave enough space for the stackframe
first, and then align the final pointer at 16 bytes.
Checked on x86_64-gnu.
Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>
Message-Id: <20230515083323.1358039-3-bugaevc@gmail.com>
| -rw-r--r-- | sysdeps/mach/hurd/x86/trampoline.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/sysdeps/mach/hurd/x86/trampoline.c b/sysdeps/mach/hurd/x86/trampoline.c index 19bddad..1f92064 100644 --- a/sysdeps/mach/hurd/x86/trampoline.c +++ b/sysdeps/mach/hurd/x86/trampoline.c @@ -196,15 +196,14 @@ _hurd_setup_sighandler (struct hurd_sigstate *ss, const struct sigaction *action #endif } + /* Push the arguments to call `trampoline' on the stack. */ + sigsp -= sizeof (*stackframe); #ifdef __x86_64__ /* Align SP at 16 bytes. Coupled with the fact that sigreturn_addr is 16-byte aligned within the stackframe struct, this ensures that it ends up on a 16-byte aligned address, as required by the ABI. */ sigsp = (void *) ((uintptr_t) sigsp & ~15UL); #endif - - /* Push the arguments to call `trampoline' on the stack. */ - sigsp -= sizeof (*stackframe); stackframe = sigsp; if (_hurdsig_catch_memory_fault (stackframe)) |