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/*
* Copyright (C) 2000-2005 Erik Andersen <andersen@uclibc.org>
*
* Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
*/
#ifndef _DL_OSINFO_H
#define _DL_OSINFO_H 1
#include <features.h>
#ifdef __UCLIBC_HAS_SSP__
# if defined IS_IN_libc || defined IS_IN_rtld
# if defined __SSP__ || defined __SSP_ALL__
# error "file must not be compiled with stack protection enabled on it. Use -fno-stack-protector"
# endif
# include <stdint.h>
# ifdef IS_IN_libc
# include <fcntl.h>
# include <unistd.h>
# include <sys/time.h>
# define OPEN open
# define READ read
# define CLOSE close
# define GETTIMEOFDAY gettimeofday
# else
# define OPEN _dl_open
# define READ _dl_read
# define CLOSE _dl_close
# define GETTIMEOFDAY _dl_gettimeofday
# endif
static __always_inline uintptr_t _dl_setup_stack_chk_guard(void)
{
uintptr_t ret;
# ifndef __SSP_QUICK_CANARY__
{
int fd = OPEN("/dev/urandom", O_RDONLY, 0);
if (fd >= 0) {
size_t size = READ(fd, &ret, sizeof(ret));
CLOSE(fd);
if (size == (size_t) sizeof(ret))
return ret;
}
}
# endif /* !__SSP_QUICK_CANARY__ */
/* Start with the "terminator canary". */
ret = 0xFF0A0D00UL;
/* Everything failed? Or we are using a weakened model of the
* terminator canary */
{
struct timeval tv;
if (GETTIMEOFDAY(&tv, NULL) != (-1))
ret ^= tv.tv_usec ^ tv.tv_sec;
}
return ret;
}
# endif /* libc || rtld */
#endif /* __UCLIBC_HAS_SSP__ */
#endif /* _DL_OSINFO_H */
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