[Bug libelf/21315] multiple misaligned address errors for Elf64_Shdr

mark at klomp dot org sourceware-bugzilla@sourceware.org
Mon Apr 3 15:07:00 GMT 2017


Mark Wielaard <mark at klomp dot org> changed:

           What    |Removed                     |Added
                 CC|                            |mark at klomp dot org

--- Comment #1 from Mark Wielaard <mark at klomp dot org> ---
Note that in some cases elfutils deliberately does unaligned accesses if it
believes it is safe. See the following in lib/eu-config.h:

/* Define ALLOW_UNALIGNED if the architecture allows operations on
   unaligned memory locations.  */
#if (defined __i386__ || defined __x86_64__) && ! CHECK_UNDEFINED
# define ALLOW_UNALIGNED        1
# define ALLOW_UNALIGNED        0

Note that it is to not allow unaligned accesses when configuring with
--enable-sanitize-undefined (which adds -fsanitize=undefined
-fno-sanitize-recover to CFLAGS and CXXFLAGS).

Are you configuring using --enable-sanitize-undefined? Or adding
-fsanitize=undefined by hand? In the later case you should also add

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