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(localhost [IPv6:::1]) by gnu-cfl-3.localdomain (Postfix) with ESMTP id F184D7402D7; Tue, 19 Dec 2023 10:02:56 -0800 (PST) From: "H.J. Lu" To: libc-alpha@sourceware.org Cc: adhemerval.zanella@linaro.org Subject: [PATCH] tst-setcontext10.c: Undef _FORTIFY_SOURCE Date: Tue, 19 Dec 2023 10:02:56 -0800 Message-ID: <20231219180256.3082953-1-hjl.tools@gmail.com> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 X-Spam-Status: No, score=-3024.8 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_FROM, GIT_PATCH_0, KAM_SHORT, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org 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. --- stdlib/tst-setcontext10.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/stdlib/tst-setcontext10.c b/stdlib/tst-setcontext10.c index 2926753cb1..d714563742 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 . */ +/* 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 #include #include