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From: "bic60176 at gmail dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug sanitizer/115273] New: [12 Regression] passing zero to ctz() check missing Date: Wed, 29 May 2024 10:37:29 +0000 [thread overview] Message-ID: <bug-115273-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115273 Bug ID: 115273 Summary: [12 Regression] passing zero to ctz() check missing Product: gcc Version: 12.3.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: sanitizer Assignee: unassigned at gcc dot gnu.org Reporter: bic60176 at gmail dot com CC: dodji at gcc dot gnu.org, dvyukov at gcc dot gnu.org, jakub at gcc dot gnu.org, kcc at gcc dot gnu.org Target Milestone: --- Created attachment 58305 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=58305&action=edit testcase OS: Ubuntu 22.04.3 LTS We found a case that UBSAN missed checking if zero is passed to __builtin_ctz() when compiling with gcc-12.3.0. When compiling with gcc-11.4.0, gcc-13.2.0, and gcc-14.1.0, UBSAN can detect the undefined behavior. $ ../compiler-builds/gcc-12.3.0_build/bin/gcc -fsanitize=undefined -g -lgcc_s -I/home/csmith/include/csmith-2.3.0 testcase.c -o exec $ timeout 1s ./exec 2>exec.err $ cat exec.err $ ../compiler-builds/gcc-11.4.0_build/bin/gcc -fsanitize=undefined -g -lgcc_s -I/home/csmith/include/csmith-2.3.0 testcase.c -o exec $ timeout 1s ./exec 2>exec.err testcase.c:957:44: runtime error: passing zero to ctz(), which is not a valid argument testcase.c:997:25: runtime error: passing zero to ctz(), which is not a valid argument testcase.c:957: runtime error: passing zero to ctz(), which is not a valid argument testcase.c:997: runtime error: passing zero to ctz(), which is not a valid argument testcase.c:957: runtime error: passing zero to ctz(), which is not a valid argument testcase.c:997: runtime error: passing zero to ctz(), which is not a valid argument testcase.c:957: runtime error: passing zero to ctz(), which is not a valid argument testcase.c:997: runtime error: passing zero to ctz(), which is not a valid argument testcase.c:957: runtime error: passing zero to ctz(), which is not a valid argument testcase.c:997: runtime error: passing zero to ctz(), which is not a valid argument testcase.c:957: runtime error: passing zero to ctz(), which is not a valid argument testcase.c:997: runtime error: passing zero to ctz(), which is not a valid argument testcase.c:957: runtime error: passing zero to ctz(), which is not a valid argument testcase.c:997: runtime error: passing zero to ctz(), which is not a valid argument testcase.c:957: runtime error: passing zero to ctz(), which is not a valid argument testcase.c:997: runtime error: passing zero to ctz(), which is not a valid argument testcase.c:957: runtime error: passing zero to ctz(), which is not a valid argument testcase.c:997: runtime error: passing zero to ctz(), which is not a valid argument testcase.c:957: runtime error: passing zero to ctz(), which is not a valid argument testcase.c:997: runtime error: passing zero to ctz(), which is not a valid argument
next reply other threads:[~2024-05-29 10:37 UTC|newest] Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top 2024-05-29 10:37 bic60176 at gmail dot com [this message] 2024-05-29 10:38 ` [Bug sanitizer/115273] " bic60176 at gmail dot com 2024-05-29 11:20 ` rguenth at gcc dot gnu.org 2024-06-02 1:45 ` pinskia at gcc dot gnu.org 2024-06-02 1:46 ` pinskia at gcc dot gnu.org 2024-06-02 1:51 ` pinskia at gcc dot gnu.org
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