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| author | H.J. Lu <hjl.tools@gmail.com> | 2017-07-11 07:44:01 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2017-07-11 07:44:14 -0700 |
| commit | ed421fca42fd9b4cab7c66e77894b8dd7ca57ed0 (patch) | |
| tree | f1131793bd3340ada62e6d31434e1d8003eec2fd /sysdeps | |
| parent | 94070f86c0c849c71ed2e7e2189bb4d1f7411a17 (diff) | |
| download | glibc-ed421fca42fd9b4cab7c66e77894b8dd7ca57ed0.zip glibc-ed421fca42fd9b4cab7c66e77894b8dd7ca57ed0.tar.gz glibc-ed421fca42fd9b4cab7c66e77894b8dd7ca57ed0.tar.bz2 | |
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 'sysdeps')
| -rw-r--r-- | sysdeps/posix/libc_fatal.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/sysdeps/posix/libc_fatal.c b/sysdeps/posix/libc_fatal.c index b261963..25af8bd 100644 --- a/sysdeps/posix/libc_fatal.c +++ b/sysdeps/posix/libc_fatal.c @@ -64,7 +64,7 @@ struct str_list /* Abort with an error message. */ void -__libc_message (int do_abort, const char *fmt, ...) +__libc_message (enum __libc_message_action action, const char *fmt, ...) { va_list ap; int fd = -1; @@ -140,7 +140,7 @@ __libc_message (int do_abort, const char *fmt, ...) written = WRITEV_FOR_FATAL (fd, iov, nlist, total); - if (do_abort) + if ((action & do_abort)) { total = ((total + 1 + GLRO(dl_pagesize) - 1) & ~(GLRO(dl_pagesize) - 1)); @@ -167,9 +167,10 @@ __libc_message (int do_abort, const char *fmt, ...) va_end (ap); - if (do_abort) + if ((action & do_abort)) { - BEFORE_ABORT (do_abort, written, fd); + if ((action & do_backtrace)) + BEFORE_ABORT (do_abort, written, fd); /* Kill the application. */ abort (); @@ -182,6 +183,6 @@ __libc_fatal (const char *message) { /* The loop is added only to keep gcc happy. */ while (1) - __libc_message (1, "%s", message); + __libc_message (do_abort | do_backtrace, "%s", message); } libc_hidden_def (__libc_fatal) |