[llvmlinux] VLAIS cleanup

Renato Golin renato.golin at linaro.org
Mon Mar 24 16:40:58 UTC 2014

On 24 March 2014 16:28, PaX Team <pageexec at freemail.hu> wrote:
> note the last field in struct shash_desc: void *__ctx[] CRYPTO_MINALIGN_ATTR;
> what the various callbacks in shash_alg structs do is that they call shash_desc_ctx()
> to convert the shash_desc ptr into the ctx ptr: return desc->__ctx;

Oh, and since desc's last member is a VLA, and it's in the same
position as sdesc's ctx, whatever goes in ctx, gets in __ctx. That's

But I see why it would be a lot faster than keeping it in a separate
argument, list, tables, etc.

And now I see how the patch fixes the issue without much trouble, and
not being any uglier.


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