mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-29 05:51:10 +00:00
7137d682eb
On x86, ifuncmain6pie failed with: [hjl@gnu-cfl-2 build-i686-linux]$ ./elf/ifuncmain6pie --direct ./elf/ifuncmain6pie: IFUNC symbol 'foo' referenced in '/export/build/gnu/tools-build/glibc-32bit/build-i686-linux/elf/ifuncmod6.so' is defined in the executable and creates an unsatisfiable circular dependency. [hjl@gnu-cfl-2 build-i686-linux]$ readelf -rW elf/ifuncmod6.so | grep foo 00003ff4 00000706 R_386_GLOB_DAT 0000400c foo_ptr 00003ff8 00000406 R_386_GLOB_DAT 00000000 foo 0000400c 00000401 R_386_32 00000000 foo [hjl@gnu-cfl-2 build-i686-linux]$ Remove non-JUMP_SLOT relocations against foo in ifuncmod6.so, which trigger the circular IFUNC dependency, and build ifuncmain6pie with -Wl,-z,lazy.
58 lines
808 B
C
58 lines
808 B
C
/* Test STT_GNU_IFUNC symbols in PIE:
|
|
|
|
1. Direct function call.
|
|
2. Function pointer.
|
|
3. Reference from a shared library.
|
|
*/
|
|
|
|
#include <stdlib.h>
|
|
#include "ifunc-sel.h"
|
|
|
|
typedef int (*foo_p) (void);
|
|
|
|
static int
|
|
one (void)
|
|
{
|
|
return -30;
|
|
}
|
|
|
|
void * foo_ifunc (void) __asm__ ("foo");
|
|
__asm__(".type foo, %gnu_indirect_function");
|
|
|
|
void *
|
|
inhibit_stack_protector
|
|
foo_ifunc (void)
|
|
{
|
|
return ifunc_one (one);
|
|
}
|
|
|
|
extern int foo (void);
|
|
extern int call_foo (void);
|
|
extern foo_p get_foo_p (void);
|
|
|
|
foo_p foo_ptr = foo;
|
|
|
|
int
|
|
main (void)
|
|
{
|
|
foo_p p;
|
|
|
|
if (call_foo () != -30)
|
|
abort ();
|
|
|
|
p = get_foo_p ();
|
|
if (p != foo)
|
|
abort ();
|
|
if ((*p) () != -30)
|
|
abort ();
|
|
|
|
if (foo_ptr != foo)
|
|
abort ();
|
|
if ((*foo_ptr) () != -30)
|
|
abort ();
|
|
if (foo () != -30)
|
|
abort ();
|
|
|
|
return 0;
|
|
}
|