https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63245
Bug ID: 63245
Summary: renderMemorySnippet shouldn't show more bytes than the
underlying type
Product: gcc
Version: 5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: sanitizer
Assignee: unassigned at gcc dot gnu.org
Reporter: hjl.tools 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
c-c++-common/ubsan/align-4.c fails at random for -m32 on Linux/x86:
/export/gnu/import/git/gcc/gcc/testsuite/c-c++-common/ubsan/align-2.c:37:11:
runtime error: load of misaligned address 0x08049ff1 for type 'long long int',
which requires 4 byte alignment
0x08049ff1: note: pointer points here
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Program received signal SIGSEGV, Segmentation fault.
0xf79f0e98 in renderMemorySnippet (Args=<optimized out>,
NumRanges=<optimized out>, Ranges=<optimized out>, Loc=<optimized out>,
Decor=...)
at /export/gnu/import/git/gcc/libsanitizer/ubsan/ubsan_diag.cc:208
208 Printf("%s%02x", (P % 8 == 0) ? " " : " ", C);
(gdb)
The program has
08048000-08049000 r-xp 00000000 08:11 39853233
/export/build/gnu/gcc-x32-mx32/build-x86_64-linux/gcc/testsuite/g++/align-4.exe
08049000-0804a000 rw-p 00000000 08:11 39853233
/export/build/gnu/gcc-x32-mx32/build-x86_64-linux/gcc/testsuite/g++/align-4.exe
There is a long long int at 0x08049ff1. But renderMemorySnippet tries
to show 32 bytes even though long long int only has 8 bytes.
