Add from trunk.

1 files changed, 64 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/common/dl-osinfo.h b/libc/sysdeps/linux/common/dl-osinfo.h
new file mode 100644
index 000000000..ee3e2ce99
--- /dev/null
+++ b/libc/sysdeps/linux/common/dl-osinfo.h
@@ -0,0 +1,64 @@
+/*
+ * 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__
+#include <stdint.h>
+#include <sys/time.h>
+
+#ifdef IS_IN_libc
+#include <ssp-internal.h>
+#if 0
+#ifndef __SSP_QUICK_CANARY__
+#define OPEN __libc_open
+#define READ __libc_read
+#define CLOSE __libc_close
+#endif
+#define GETTIMEOFDAY gettimeofday
+#endif
+#else
+#ifndef __SSP_QUICK_CANARY__
+#define OPEN _dl_open
+#define READ _dl_read
+#define CLOSE _dl_close
+#endif
+#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 /* __UCLIBC_HAS_SSP__ */
+
+#endif /* _DL_OSINFO_H */