123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566 |
- /*
- * 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 */
|