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1864775abc
Calling an IFUNC function defined in unrelocated executable also leads to segfault. Issue a fatal error message when calling IFUNC function defined in the unrelocated executable from a shared library. 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. (cherry picked from commits6ea5b57afaand7137d682eb)
58 lines
808 B
C
58 lines
808 B
C
/* Test STT_GNU_IFUNC symbols in PIE:
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1. Direct function call.
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2. Function pointer.
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3. Reference from a shared library.
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*/
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#include <stdlib.h>
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#include "ifunc-sel.h"
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typedef int (*foo_p) (void);
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static int
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one (void)
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{
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return -30;
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}
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void * foo_ifunc (void) __asm__ ("foo");
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__asm__(".type foo, %gnu_indirect_function");
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void *
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inhibit_stack_protector
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foo_ifunc (void)
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{
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return ifunc_one (one);
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}
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extern int foo (void);
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extern int call_foo (void);
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extern foo_p get_foo_p (void);
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foo_p foo_ptr = foo;
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int
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main (void)
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{
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foo_p p;
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if (call_foo () != -30)
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abort ();
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p = get_foo_p ();
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if (p != foo)
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abort ();
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if ((*p) () != -30)
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abort ();
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if (foo_ptr != foo)
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abort ();
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if ((*foo_ptr) () != -30)
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abort ();
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if (foo () != -30)
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abort ();
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return 0;
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}
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