mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-27 19:53:32 +08:00
de6591238b
When dynamically linking, ifunc resolvers are called before TLS is
initialized, so they cannot be safely stack-protected.
We avoid disabling stack-protection on large numbers of files by
using __attribute__ ((__optimize__ ("-fno-stack-protector")))
to turn it off just for the resolvers themselves. (We provide
the attribute even when statically linking, because we will later
use it elsewhere too.)
60 lines
941 B
C
60 lines
941 B
C
/* Test 3 STT_GNU_IFUNC symbols. */
|
|
|
|
#include "ifunc-sel.h"
|
|
|
|
int global = -1;
|
|
/* Can't use __attribute__((visibility("protected"))) until the GCC bug:
|
|
|
|
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65248
|
|
|
|
is fixed. */
|
|
asm (".protected global");
|
|
|
|
static int
|
|
one (void)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static int
|
|
minus_one (void)
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
static int
|
|
zero (void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
void * foo1_ifunc (void) __asm__ ("foo1");
|
|
__asm__(".type foo1, %gnu_indirect_function");
|
|
|
|
void *
|
|
inhibit_stack_protector
|
|
foo1_ifunc (void)
|
|
{
|
|
return ifunc_sel (one, minus_one, zero);
|
|
}
|
|
|
|
void * foo2_ifunc (void) __asm__ ("foo2");
|
|
__asm__(".type foo2, %gnu_indirect_function");
|
|
|
|
void *
|
|
inhibit_stack_protector
|
|
foo2_ifunc (void)
|
|
{
|
|
return ifunc_sel (minus_one, one, zero);
|
|
}
|
|
|
|
void * foo3_ifunc (void) __asm__ ("foo3");
|
|
__asm__(".type foo3, %gnu_indirect_function");
|
|
|
|
void *
|
|
inhibit_stack_protector
|
|
foo3_ifunc (void)
|
|
{
|
|
return ifunc_sel (one, zero, minus_one);
|
|
}
|