0a5dfdbd1b
Compiling with any of the -fstack-protector* flags requires the
__stack_chk_guard data import (which needs to be initialized) and the
__stack_chk_fail{,_local} functions. While GCC's own libssp can provide
these, it is better that we provide these ourselves. The implementation
is custom due to being OS-specific.
Signed-off-by: Yaakov Selkowitz <yselkowi@redhat.com>
46 lines
976 B
C
46 lines
976 B
C
#include <sys/cdefs.h>
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#include <sys/param.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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uintptr_t __stack_chk_guard = 0;
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void
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__attribute__((__constructor__))
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__stack_chk_init (void)
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{
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if (__stack_chk_guard != 0)
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return;
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#if defined(__CYGWIN__) || defined(__rtems__)
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arc4random_buf(&__stack_chk_guard, sizeof(__stack_chk_guard));
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#else
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/* If getentropy is not available, use the "terminator canary". */
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((unsigned char *)&__stack_chk_guard)[0] = 0;
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((unsigned char *)&__stack_chk_guard)[1] = 0;
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((unsigned char *)&__stack_chk_guard)[2] = '\n';
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((unsigned char *)&__stack_chk_guard)[3] = 255;
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#endif
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}
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void
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__attribute__((__noreturn__))
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__stack_chk_fail (void)
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{
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char msg[] = "*** stack smashing detected ***: terminated\n";
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write (2, msg, strlen (msg));
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raise (SIGABRT);
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_exit (127);
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}
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#ifdef __ELF__
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void
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__attribute__((visibility ("hidden")))
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__stack_chk_fail_local (void)
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{
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__stack_chk_fail();
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}
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#endif
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