diff options
Diffstat (limited to 'lib/libc/sys/stack_protector.c')
| -rw-r--r-- | lib/libc/sys/stack_protector.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/lib/libc/sys/stack_protector.c b/lib/libc/sys/stack_protector.c index 14c20eb..b0108f9 100644 --- a/lib/libc/sys/stack_protector.c +++ b/lib/libc/sys/stack_protector.c @@ -34,10 +34,13 @@ __FBSDID("$FreeBSD$"); #include <sys/param.h> #include <sys/sysctl.h> #include <sys/types.h> +#include <errno.h> +#include <link.h> #include <signal.h> #include <string.h> #include <syslog.h> #include <unistd.h> +#include "libc_private.h" extern int __sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, size_t newlen); @@ -54,9 +57,14 @@ __guard_setup(void) { int mib[2]; size_t len; + int error; if (__stack_chk_guard[0] != 0) return; + error = _elf_aux_info(AT_CANARY, __stack_chk_guard, + sizeof(__stack_chk_guard)); + if (error == 0 && __stack_chk_guard[0] != 0) + return; mib[0] = CTL_KERN; mib[1] = KERN_ARND; |
