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Do not stack-protect sigreturn stubs [BZ #7065]

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These are called from the kernel with the stack at a carefully-
chosen location so that the stack frame can be restored: they must not
move the stack pointer lest garbage be restored into the registers.

We explicitly inhibit protection for SPARC and for signal/sigreturn.c:
other arches either define their sigreturn stubs in .S files, or (i386,
x86_64, mips) use macros expanding to top-level asm blocks and explicit
labels in the text section to mock up a "function" without telling the
compiler that one is there at all.
This commit is contained in:
Nick Alcock
2016-12-26 10:09:06 +01:00
committed by Florian Weimer
parent 1ad4ba28e9
commit 2e6c45c59b
4 changed files with 20 additions and 3 deletions
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8
sysdeps/unix/sysv/linux/sparc/sparc32/sigaction.c
View File

@ -65,7 +65,9 @@ libc_hidden_def (__libc_sigaction)
#include <nptl/sigaction.c>
static void
static
inhibit_stack_protector
void
__rt_sigreturn_stub (void)
{
__asm__ ("mov %0, %%g1\n\t"
@ -74,7 +76,9 @@ __rt_sigreturn_stub (void)
: "i" (__NR_rt_sigreturn));
}
static void
static
inhibit_stack_protector
void
__sigreturn_stub (void)
{
__asm__ ("mov %0, %%g1\n\t"

4
sysdeps/unix/sysv/linux/sparc/sparc64/sigaction.c
View File

@ -66,7 +66,9 @@ libc_hidden_def (__libc_sigaction)
#include <nptl/sigaction.c>
static void
static
inhibit_stack_protector
void
__rt_sigreturn_stub (void)
{
__asm__ ("mov %0, %%g1\n\t"