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[Bug libelf/21315] multiple misaligned address errors for Elf64_Shdr
- From: "ago at gentoo dot org" <sourceware-bugzilla at sourceware dot org>
- To: elfutils-devel at sourceware dot org
- Date: Mon, 03 Apr 2017 16:37:50 +0000
- Subject: [Bug libelf/21315] multiple misaligned address errors for Elf64_Shdr
- Auto-submitted: auto-generated
- References: <bug-21315-10460@http.sourceware.org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=21315
--- Comment #2 from Agostino Sarubbo <ago at gentoo dot org> ---
(In reply to Mark Wielaard from comment #1)
> 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. */
> #define SANITIZE_UNDEFINED 1
> #if (defined __i386__ || defined __x86_64__) && ! CHECK_UNDEFINED
> # define ALLOW_UNALIGNED 1
> #else
> # define ALLOW_UNALIGNED 0
> #endif
>
> 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
> -DCHECK_UNDEFINED=1
It was added by hand..I need to test if I obtain those warning with
--enable-sanitize-undefined
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