On Fri, Nov 21, 2014 at 12:42:34PM +0000, Simon McVittie wrote:
> A couple of questions for people who know low-level things:
>
> * Of Debian's architectures (official and otherwise), which ones are
> known/defined/designed to be OK with unaligned accesses from
> user-space, and which ones (can be configured to) crash or give wrong
> answers?
This is what OpenSSL uses:
#define STRICT_ALIGNMENT 1
#ifndef PEDANTIC
#if defined(__i386) || defined(__i386__) || \
defined(__x86_64) || defined(__x86_64__) || \
defined(_M_IX86) || defined(_M_AMD64) || defined(_M_X64) || \
defined(__aarch64__) || \
defined(__s390__) || defined(__s390x__)
# undef STRICT_ALIGNMENT
#endif
#endif
I assume that's the list they ended up with not having issues with
it so far. I think I've seen one issue or an other on almost
all the architectures, even if the wiki claims it works.
man prctl says:
PR_SET_UNALIGN
(Only on: ia64, since Linux 2.3.48; parisc,
since Linux 2.6.15; PowerPC, since Linux 2.6.18; Alpha,
since Linux 2.6.22)
Kurt
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