Initial version

1 files changed, 31 insertions, 0 deletions

diff --git a/src/env/__stack_chk_fail.c b/src/env/__stack_chk_fail.c
new file mode 100644
index 0000000..e535260
--- /dev/null
+++ b/src/env/__stack_chk_fail.c
@@ -0,0 +1,31 @@
+#include <string.h>
+#include <stdint.h>
+#include "pthread_impl.h"
+
+uintptr_t __stack_chk_guard;
+
+void __init_ssp(void *entropy)
+{
+	if (entropy) memcpy(&__stack_chk_guard, entropy, sizeof(uintptr_t));
+	else __stack_chk_guard = (uintptr_t)&__stack_chk_guard * 1103515245;
+
+#if UINTPTR_MAX >= 0xffffffffffffffff
+	/* Sacrifice 8 bits of entropy on 64bit to prevent leaking/
+	 * overwriting the canary via string-manipulation functions.
+	 * The NULL byte is on the second byte so that off-by-ones can
+	 * still be detected. Endianness is taken care of
+	 * automatically. */
+	((char *)&__stack_chk_guard)[1] = 0;
+#endif
+
+	__pthread_self()->canary = __stack_chk_guard;
+}
+
+void __stack_chk_fail(void)
+{
+	a_crash();
+}
+
+hidden void __stack_chk_fail_local(void);
+
+weak_alias(__stack_chk_fail, __stack_chk_fail_local);