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-rw-r--r--libc/sysdeps/linux/common/ssp.c44
1 files changed, 28 insertions, 16 deletions
diff --git a/libc/sysdeps/linux/common/ssp.c b/libc/sysdeps/linux/common/ssp.c
index 9db8338e7..01b934b4a 100644
--- a/libc/sysdeps/linux/common/ssp.c
+++ b/libc/sysdeps/linux/common/ssp.c
@@ -21,7 +21,7 @@
#endif
#ifdef __SSP__
-#error ssp.c has to be built w/ -fno-stack-protector
+# error ssp.c has to be built w/ -fno-stack-protector
#endif
#include <stdio.h>
@@ -45,13 +45,23 @@
# define SSP_SIGTYPE SIGABRT
#endif
-/* prototypes */
-extern int __libc_open (__const char *file, int oflag, ...);
-extern ssize_t __libc_read(int fd, void *buf, size_t count);
-extern int __libc_close (int fd);
-
unsigned long __guard = 0UL;
+/* Use of __* functions from the rest of glibc here avoids
+ * initialisation problems for executables preloaded with
+ * libraries that overload the associated standard library
+ * functions.
+ */
+#ifdef __UCLIBC__
+extern int __libc_open(__const char *file, int flags, ...);
+extern ssize_t __libc_read(int fd, void *buf, size_t count);
+extern int __libc_close(int fd);
+#else
+# define __libc_open(file, flags) __open(file, flags)
+# define __libc_read(fd, buf, count) __read(fd, buf, count)
+# define __libc_close(fd) __close(fd)
+#endif
+
void __guard_setup(void) __attribute__ ((constructor));
void __guard_setup(void)
{
@@ -66,16 +76,18 @@ void __guard_setup(void)
#ifndef __SSP_QUICK_CANARY__
# ifdef __SSP_USE_ERANDOM__
- int mib[3];
- /* Random is another depth in Linux, hence an array of 3. */
- mib[0] = CTL_KERN;
- 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;
+ {
+ int mib[3];
+ /* Random is another depth in Linux, hence an array of 3. */
+ mib[0] = CTL_KERN;
+ 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;
+ }
# endif /* ifdef __SSP_USE_ERANDOM__ */
/*
* Attempt to open kernel pseudo random device if one exists before