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authorPeter S. Mazinger <ps.m@gmx.net>2005-10-01 15:48:22 +0000
committerPeter S. Mazinger <ps.m@gmx.net>2005-10-01 15:48:22 +0000
commit812cc95678da2eac1a405996a94ffc8bc239d9b9 (patch)
treedf5bd00edd3f816be4eaa1fca8ee563e91ce9b95 /libc/misc/internals
parent1db3d05e27623403bdd451488c2290ec255b4c4c (diff)
Add gcc-4.1 non-TLS __stack_chk_guard support. Run the guard setup only once.
Diffstat (limited to 'libc/misc/internals')
-rw-r--r--libc/misc/internals/__uClibc_main.c40
1 files changed, 23 insertions, 17 deletions
diff --git a/libc/misc/internals/__uClibc_main.c b/libc/misc/internals/__uClibc_main.c
index c88649def..b3876ae15 100644
--- a/libc/misc/internals/__uClibc_main.c
+++ b/libc/misc/internals/__uClibc_main.c
@@ -27,8 +27,12 @@
#include <sys/sysmacros.h>
#ifdef __UCLIBC_HAS_SSP__
#include <ssp-internal.h>
+#include <stdint.h>
-unsigned long __guard = 0UL;
+/* for gcc-3.x + Etoh ssp */
+uintptr_t __guard /* segfaults with attribute_relro */;
+/* for gcc-4.1 non-TLS */
+uintptr_t __stack_chk_guard /* attribute_relro */;
#endif
/*
@@ -107,11 +111,9 @@ static int __check_suid(void)
}
#ifdef __UCLIBC_HAS_SSP__
-static __always_inline void __guard_setup(void)
+static __always_inline uintptr_t _dl_guard_setup(void)
{
- if (__guard != 0UL)
- return;
-
+ uintptr_t ret;
#ifndef __SSP_QUICK_CANARY__
size_t size;
@@ -124,10 +126,9 @@ static __always_inline void __guard_setup(void)
mib[1] = KERN_RANDOM;
mib[2] = RANDOM_ERANDOM;
- size = sizeof(unsigned long);
- if (SYSCTL(mib, 3, &__guard, &size, NULL, 0) != (-1))
- if (__guard != 0UL)
- return;
+ if (SYSCTL(mib, 3, &ret, &size, NULL, 0) != (-1))
+ if (size == (size_t) sizeof(ret))
+ return ret;
}
# endif /* ifdef __SSP_USE_ERANDOM__ */
{
@@ -141,25 +142,26 @@ static __always_inline void __guard_setup(void)
if ((fd = OPEN("/dev/erandom", O_RDONLY)) == (-1))
# endif
fd = OPEN("/dev/urandom", O_RDONLY);
- if (fd != (-1)) {
- size = READ(fd, (char *) &__guard, sizeof(__guard));
+ if (fd >= 0) {
+ size = READ(fd, &ret, sizeof(ret));
CLOSE(fd);
- if (size == sizeof(__guard))
- return;
+ if (size == (size_t) sizeof(ret))
+ return ret;
}
}
#endif /* ifndef __SSP_QUICK_CANARY__ */
/* Start with the "terminator canary". */
- __guard = 0xFF0A0D00UL;
+ ret = 0xFF0A0D00UL;
/* Everything failed? Or we are using a weakened model of the
* terminator canary */
{
struct timeval tv;
- GETTIMEOFDAY(&tv, NULL);
- __guard ^= tv.tv_usec ^ tv.tv_sec;
+ if (GETTIMEOFDAY(&tv, NULL) != (-1))
+ ret ^= tv.tv_usec ^ tv.tv_sec;
}
+ return ret;
}
#endif /* __UCLIBC_HAS_SSP__ */
@@ -198,7 +200,11 @@ void __uClibc_init(void)
#endif
#ifdef __UCLIBC_HAS_SSP__
- __guard_setup ();
+ uintptr_t stack_chk_guard = _dl_guard_setup();
+ /* for gcc-3.x + Etoh ssp */
+ __guard = stack_chk_guard;
+ /* for gcc-4.1 non-TLS */
+ __stack_chk_guard = stack_chk_guard;
#endif
#ifdef __UCLIBC_HAS_LOCALE__