1 files changed, 100 insertions, 0 deletions
diff --git a/libc/bionic/ssp.c b/libc/bionic/ssp.c
new file mode 100644
index 0000000..20794f4
--- /dev/null
+++ b/libc/bionic/ssp.c
@@ -0,0 +1,100 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <signal.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <ctype.h>
+#include "logd.h"
+
+void *__stack_chk_guard = 0;
+
+/* Initialize the canary with a random value from /dev/urandom.
+ * If that fails, use the "terminator canary". */
+static void __attribute__ ((constructor))
+__guard_setup(void)
+{
+    int fd;
+
+    fd = open("/dev/urandom", O_RDONLY);
+    if (fd != -1) {
+        ssize_t len = read(fd, &__stack_chk_guard,
+                           sizeof(__stack_chk_guard));
+        close(fd);
+        if (len == sizeof(__stack_chk_guard))
+            return;
+    }
+
+    /* If that failed, switch to 'terminator canary' */
+    ((unsigned char *)&__stack_chk_guard)[0] = 0;
+    ((unsigned char *)&__stack_chk_guard)[1] = 0;
+    ((unsigned char *)&__stack_chk_guard)[2] = '\n';
+    ((unsigned char *)&__stack_chk_guard)[3] = 255;
+}
+
+/* This is the crash handler.
+ * Does a best effort at logging and calls _exit to terminate
+ * the process immediately (without atexit handlers, etc.) */
+void __stack_chk_fail(void)
+{
+    struct sigaction sa;
+    sigset_t sigmask;
+    static const char message[] = "stack corruption detected: aborted";
+    char path[PATH_MAX];
+    int count;
+
+    /* Immediately block all (but SIGABRT) signal handlers from running code */
+    sigfillset(&sigmask);
+    sigdelset(&sigmask, SIGABRT);
+    sigprocmask(SIG_BLOCK, &sigmask, NULL);
+
+    /* Use /proc/self/exe link to obtain the program name for logging
+     * purposes. If it's not available, we set it to "unknown" */
+    if ((count = readlink("/proc/self/exe", path, sizeof(path) - 1)) == -1) {
+        strlcpy(path, "unknown", sizeof(path));
+    } else {
+        path[count] = '\0';
+    }
+
+    /* Do a best effort at logging. This ends up calling writev(2) */
+    __libc_android_log_print(ANDROID_LOG_FATAL, path, message);
+
+    /* Make sure there is no default action for SIGABRT */
+    bzero(&sa, sizeof(struct sigaction));
+    sigemptyset(&sa.sa_mask);
+    sa.sa_flags = 0;
+    sa.sa_handler = SIG_DFL;
+    sigaction(SIGABRT, &sa, NULL);
+
+    /* Terminate the process and exit immediately */
+    kill(getpid(), SIGABRT);
+
+    _exit(127);
+}