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authorH.J. Lu <hjl.tools@gmail.com>2017-07-11 07:44:01 -0700
committerH.J. Lu <hjl.tools@gmail.com>2017-07-11 07:44:14 -0700
commited421fca42fd9b4cab7c66e77894b8dd7ca57ed0 (patch)
treef1131793bd3340ada62e6d31434e1d8003eec2fd /include
parent94070f86c0c849c71ed2e7e2189bb4d1f7411a17 (diff)
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Avoid backtrace from __stack_chk_fail [BZ #12189]
__stack_chk_fail is called on corrupted stack. Stack backtrace is very unreliable against corrupted stack. __libc_message is changed to accept enum __libc_message_action and call BEFORE_ABORT only if action includes do_backtrace. __fortify_fail_abort is added to avoid backtrace from __stack_chk_fail. [BZ #12189] * debug/Makefile (CFLAGS-tst-ssp-1.c): New. (tests): Add tst-ssp-1 if -fstack-protector works. * debug/fortify_fail.c: Include <stdbool.h>. (_fortify_fail_abort): New function. (__fortify_fail): Call _fortify_fail_abort. (__fortify_fail_abort): Add a hidden definition. * debug/stack_chk_fail.c: Include <stdbool.h>. (__stack_chk_fail): Call __fortify_fail_abort, instead of __fortify_fail. * debug/tst-ssp-1.c: New file. * include/stdio.h (__libc_message_action): New enum. (__libc_message): Replace int with enum __libc_message_action. (__fortify_fail_abort): New hidden prototype. * malloc/malloc.c (malloc_printerr): Update __libc_message calls. * sysdeps/posix/libc_fatal.c (__libc_message): Replace int with enum __libc_message_action. Call BEFORE_ABORT only if action includes do_backtrace. (__libc_fatal): Update __libc_message call.
Diffstat (limited to 'include')
-rw-r--r--include/stdio.h13
1 files changed, 12 insertions, 1 deletions
diff --git a/include/stdio.h b/include/stdio.h
index f68f633..215f919 100644
--- a/include/stdio.h
+++ b/include/stdio.h
@@ -86,13 +86,24 @@ extern int __gen_tempname (char *__tmpl, int __suffixlen, int __flags,
# define __GT_DIR 1 /* create a directory */
# define __GT_NOCREATE 2 /* just find a name not currently in use */
+enum __libc_message_action
+{
+ do_message = 0, /* Print message. */
+ do_abort = 1 << 0, /* Abort. */
+ do_backtrace = 1 << 1 /* Backtrace. */
+};
+
/* Print out MESSAGE on the error output and abort. */
extern void __libc_fatal (const char *__message)
__attribute__ ((__noreturn__));
-extern void __libc_message (int do_abort, const char *__fnt, ...);
+extern void __libc_message (enum __libc_message_action action,
+ const char *__fnt, ...);
extern void __fortify_fail (const char *msg)
__attribute__ ((__noreturn__)) internal_function;
+extern void __fortify_fail_abort (_Bool, const char *msg)
+ __attribute__ ((__noreturn__)) internal_function;
libc_hidden_proto (__fortify_fail)
+libc_hidden_proto (__fortify_fail_abort)
/* Acquire ownership of STREAM. */
extern void __flockfile (FILE *__stream);