Bug 26467 - UBSAN error: gas/cgen.c:762:32:
Summary: UBSAN error: gas/cgen.c:762:32:
Status: RESOLVED FIXED
Alias: None
Product: binutils
Classification: Unclassified
Component: binutils (show other bugs)
Version: 2.34
: P2 normal
Target Milestone: 2.36
Assignee: Alan Modra
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2020-08-20 12:31 UTC by Martin Liska
Modified: 2020-08-27 23:07 UTC (History)
0 users

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Target:
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Last reconfirmed: 2020-08-27 00:00:00


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Description Martin Liska 2020-08-20 12:31:32 UTC
The following fails when I build binutils with:
configure --build=x86_64-linux --disable-nls --disable-gdb --disable-gdbserver --disable-sim --disable-readline --disable-libdecnumber --enable-obsolete --target=mep-elf CFLAGS="-g -O2 -fsanitize=address,undefined -Wno-error" CXXLAGS="-g -O2 -fsanitize=address,undefined -Wno-error" LDFLAGS="-ldl"
Target: mep-elf
PASS: .exitm outside of a macro
Executing on host: sh -c {../as-new  -EB  -o tmpdir/allinsn.o /home/mliska/Programming/binutils/gas/testsuite/gas/mep/allinsn.s 2>&1}  /dev/null dump.tmp (timeout = 300)
/home/mliska/Programming/binutils/gas/cgen.c:762:32: runtime error: shift exponent 18446744073709551615 is too large for 64-bit type 'long int'
Comment 1 cvs-commit@gcc.gnu.org 2020-08-27 12:36:28 UTC
The master branch has been updated by Alan Modra <amodra@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=6fbd4a8e8baa7fe5adcaa1c11c885f741fccd250

commit 6fbd4a8e8baa7fe5adcaa1c11c885f741fccd250
Author: Alan Modra <amodra@gmail.com>
Date:   Thu Aug 27 13:46:45 2020 +0930

    PR26467 UBSAN: cgen.c:762 shift exponent 18446744073709551615
    
            PR 26467
            * cgen.c (weak_operand_overflow_check): Handle opmask for
            operand length zero.  Use 1UL constant.
Comment 2 Alan Modra 2020-08-27 23:07:37 UTC
Fixed