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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.)
66 lines
962 B
C
66 lines
962 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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extern foo_p foo_ptr;
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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 foo_p get_foo (void);
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extern foo_p get_foo_p (void);
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foo_p my_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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p = get_foo ();
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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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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 (my_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 ((*my_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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