diff options
author | Serge Hallyn <serge@hallyn.com> | 2008-02-29 15:14:57 +0000 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-03-20 09:46:36 -0700 |
commit | aedb60a67c10a0861af179725d060765262ba0fb (patch) | |
tree | 4a4a316f9f7d1ab0bf4da2cdd5c802bfb05c947f /fs/binfmt_elf.c | |
parent | 457fb605834504af294916411be128a9b21fc3f6 (diff) |
file capabilities: remove cap_task_kill()
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().
One example of a still-broken application is 'at' for non-root users.
This patch removes cap_task_kill().
Signed-off-by: Serge Hallyn <serge@hallyn.com>
Acked-by: Andrew G. Morgan <morgan@kernel.org>
Earlier-version-tested-by: Luiz Fernando N. Capitulino <lcapitulino@mandriva.com.br>
Acked-by: Casey Schaufler <casey@schaufler-ca.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/binfmt_elf.c')
0 files changed, 0 insertions, 0 deletions