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| author | H.J. Lu <hjl.tools@gmail.com> | 2023-12-19 09:55:25 -0800 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2023-12-19 13:39:34 -0800 |
| commit | 46432be2f1d4de962b51ca6b9f80fc37744be9f7 (patch) | |
| tree | 2ca2cea121c9868c472abc35226e5c881fbbc996 | |
| parent | cad5703e4f80841b7f7e3fe57127bd0df7ddb86e (diff) | |
| download | glibc-46432be2f1d4de962b51ca6b9f80fc37744be9f7.zip glibc-46432be2f1d4de962b51ca6b9f80fc37744be9f7.tar.gz glibc-46432be2f1d4de962b51ca6b9f80fc37744be9f7.tar.bz2 | |
tst-setcontext10.c: Undef _FORTIFY_SOURCE
When _FORTIFY_SOURCE is defined to 2, ____longjmp_chk is called,
instead of longjmp. ____longjmp_chk compares the relative stack
values to decide if it is called from a stack frame which called
setjmp. If not, ____longjmp_chk assumes that an alternate signal
stack is used. Since comparing the relative stack values isn't
reliable with user context, when there is no signal, ____longjmp_chk
will fail. Undefine _FORTIFY_SOURCE to avoid ____longjmp_chk in
user context test.
| -rw-r--r-- | stdlib/tst-setcontext10.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/stdlib/tst-setcontext10.c b/stdlib/tst-setcontext10.c index 2926753..d714563 100644 --- a/stdlib/tst-setcontext10.c +++ b/stdlib/tst-setcontext10.c @@ -16,6 +16,15 @@ License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ +/* When _FORTIFY_SOURCE is defined to 2, ____longjmp_chk is called, + instead of longjmp. ____longjmp_chk compares the relative stack + values to decide if it is called from a stack frame which called + setjmp. If not, ____longjmp_chk assumes that an alternate signal + stack is used. Since comparing the relative stack values isn't + reliable with user context, when there is no signal, ____longjmp_chk + will fail. Undefine _FORTIFY_SOURCE to avoid ____longjmp_chk. */ +#undef _FORTIFY_SOURCE + #include <stdio.h> #include <stdlib.h> #include <setjmp.h> |