On Thu, Nov 03, 2016 at 03:03:01PM -0700, Eric Biggers wrote:
> With the new (in 4.9) option to use a virtually-mapped stack
> (CONFIG_VMAP_STACK), stack buffers cannot be used as input/output for
> the scatterlist crypto API because they may not be directly mappable to
> struct page. For short filenames, fname_encrypt() was encrypting a
> stack buffer holding the padded filename. Fix it by encrypting the
> filename in-place in the output buffer, thereby making the temporary
> buffer unnecessary.
>
> This bug could most easily be observed in a CONFIG_DEBUG_SG kernel
> because this allowed the BUG in sg_set_buf() to be triggered.
>
> Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx>
This commit is on the fscrypt and dev branches on ext4.git.
- Ted
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