[PATCH] fs: Return raw xattr for security.* if there is size disagreement with LSMs

[Paul Moore]

On Thu, Jun 17, 2021 at 11:28 AM Mimi Zohar <zohar at linux.ibm.com> wrote:
> On Thu, 2021-06-17 at 07:09 +0000, Roberto Sassu wrote:

...

> > An alternative would be to do the EVM verification twice if the
> > first time didn't succeed (with vfs_getxattr_alloc() and with the
> > new function that behaves like vfs_getxattr()).
>
> Unfortunately, I don't see an alternative.

... and while unfortunate, the impact should be non-existant if you
are using the right tools to label files or ensuring that you are
formatting labels properly if doing it by hand.

Handling a corner case is good, but I wouldn't add a lot of code
complexity trying to optimize it.

-- 
paul moore
www.paul-moore.com