/* * 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> # include <sys/time.h> # ifdef IS_IN_libc #include <fcntl.h> /* libc_hidden_proto(open) */ /* libc_hidden_proto(read) */ /* libc_hidden_proto(close) */ /* libc_hidden_proto(gettimeofday) */ # 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 */