https://sourceware.org/bugzilla/show_bug.cgi?id=28720
--- Comment #10 from Mark Wielaard <mark at klomp dot org> --- (In reply to Evgeny Vereshchagin from comment #8) > (In reply to Mark Wielaard from comment #7) > > commit 9f70a762ab88ceebb8a48a7c9c3ce39ff7f205af > > Author: Mark Wielaard <m...@klomp.org> > > Date: Fri Dec 24 02:01:32 2021 +0100 > > > > libdwfl: Calculate addr to read by hand in link_map.c read_addrs. > > > > The gcc undefined sanitizer doesn't like the trick we use to calculate > > the (possibly) unaligned addresses to read. So calculate them by hand > > as unsigned char pointers. > > > > https://sourceware.org/bugzilla/show_bug.cgi?id=28720 > > > > Signed-off-by: Mark Wielaard <m...@klomp.org> > > > > Which should this particular issue. > > > I'm not sure but it seems it can still be triggered with that commit applied: > ``` > $ git log --oneline -5 > 9f70a762 (HEAD -> master, origin/master, origin/HEAD) libdwfl: Calculate > addr to read by hand in link_map.c read_addrs. > 5b490793 libdwfl: Call xlatetom on aligned buffers in dwfl_link_map_report > 1cf73965 libdwfl: Make sure dwfl_elf_phdr_memory_callback returns at least > minread > 4fdd8588 libdwfl: Always clean up build_id.memory > 8f8c78cc libdwfl: Handle unaligned Nhdr in dwfl_segment_report_module > > $ autoreconf -i -f > $ ./configure --enable-maintainer-mode --enable-sanitize-undefined > $ make -j$(nproc) V=1 > > $ UBSAN_OPTIONS=print_stacktrace=1:print_summary=1:halt_on_error=1 > LD_LIBRARY_PATH="./libdw;./libelf" ./src/stack --core > ./attachment.cgi\?id\=13875 > gelf_xlate.h:48:1: runtime error: member access within misaligned address > 0x7f5cd5612077 for type 'struct Elf32_Dyn', which requires 4 byte alignment That is a different issue than the one reported in comment #5. This bug might be split up for the different issues found. -- You are receiving this mail because: You are on the CC list for the bug.
