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From: "bic60176 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug sanitizer/115765] New: [13 Regression] signed integer overflow
 check missing
Date: Wed, 03 Jul 2024 07:48:54 +0000
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X-Bugzilla-Component: sanitizer
X-Bugzilla-Version: 13.2.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D115765

            Bug ID: 115765
           Summary: [13 Regression] signed integer overflow check missing
           Product: gcc
           Version: 13.2.0
            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 58577
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D58577&action=3Dedit
testcase

OS: Ubuntu 22.04.3 LTS
We found a case that UBSAN failed to report signed integer overflow behavior
when compiling with gcc-13.2.0, gcc-12.3.0, gcc-11.4.0 at optimization leve=
ls
-O0.

$ ../compiler-builds/gcc-13.2.0_build/bin/gcc -fsanitize=3Dundefined
-fsanitize=3Daddress -g -lgcc_s -I/home/csmith/include/csmith-2.3.0 -O0
testcase.c -o exec

$ timeout 1s ./exec 2>exec.err

$ cat exec.err

$ ../compiler-builds/gcc-14.1.0_build/bin/gcc -fsanitize=3Dundefined
-fsanitize=3Daddress -g -lgcc_s -I/home/csmith/include/csmith-2.3.0 -O1
testcase.c -o exec

$ timeout 1s ./exec 2>exec.err

$ cat exec.err
testcase.c:6:24: runtime error: signed integer overflow: 65533 * 67286 cann=
ot
be represented in type 'int'=