[RFC PATCH 0/4] Split security_task_getsecid() into subj and obj variants

Paul Moore paul at paul-moore.com
Sat Feb 20 14:41:44 UTC 2021

On Fri, Feb 19, 2021 at 8:49 PM Casey Schaufler <casey at schaufler-ca.com> wrote:
> On 2/19/2021 3:28 PM, Paul Moore wrote:
> > As discussed briefly on the list (lore link below), we are a little
> > sloppy when it comes to using task credentials, mixing both the
> > subjective and object credentials.  This patch set attempts to fix
> > this by replacing security_task_getsecid() with two new hooks that
> > return either the subjective (_subj) or objective (_obj) credentials.
> >
> > https://lore.kernel.org/linux-security-module/806848326.0ifERbkFSE@x2/T/
> >
> > Casey and John, I made a quick pass through the Smack and AppArmor
> > code in an effort to try and do the right thing, but I will admit
> > that I haven't tested those changes, just the SELinux code.  I
> > would really appreciate your help in reviewing those changes.  If
> > you find it easier, feel free to wholesale replace my Smack/AppArmor
> > patch with one of your own.
> A quick test pass didn't show up anything obviously
> amiss with the Smack changes. I have will do some more
> through inspection, but they look fine so far.

Thanks for testing it out and giving it a look.  Beyond the Smack
specific changes, I'm also interested in making sure all the hook
callers are correct; I believe I made the correct substitutions, but a
second (or third (or fourth ...)) set of eyes is never a bad idea.

paul moore

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