Re: [PATCH 1/1] file capabilities: remove cap_task_kill()

[Luiz Fernando N. Capitulino]

Em Thu, 28 Feb 2008 11:38:17 -0600
serge@xxxxxxxxxx escreveu:

| The original justification for cap_task_kill() was as follows:
| 
| 	check_kill_permission() does appropriate uid equivalence checks.
| 	However with file capabilities it becomes possible for an
| 	unprivileged user to execute a file with file capabilities
| 	resulting in a more privileged task with the same uid.
| 
| However now that cap_task_kill() always returns 0 (permission
| granted) when p->uid==current->uid, the whole hook is worthless,
| and only likely to create more subtle problems in the corner cases
| where it might still be called but return -EPERM.  Those cases
| are basically when uids are different but euid/suid is equivalent
| as per the check in check_kill_permission().
| 
| This patch removes cap_task_kill().

 2.6.24 seems to have the same bug, what about a rediff for it and
submit the patch to -stable team?

 Thanks.

-- 
Luiz Fernando N. Capitulino
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