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| author | Serge Hallyn <serge.hallyn@ubuntu.com> | 2013-07-23 13:18:53 -0500 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2013-08-30 23:44:09 -0700 |
| commit | f54fb863c6bbcbafdfc332b4a4260abb5a002137 (patch) | |
| tree | ced72284affb914341940a5f854e4d2dd56622d1 | |
| parent | 6e556ce209b09528dbf1931cbfd5d323e1345926 (diff) | |
| download | blackbird-op-linux-f54fb863c6bbcbafdfc332b4a4260abb5a002137.tar.gz blackbird-op-linux-f54fb863c6bbcbafdfc332b4a4260abb5a002137.zip | |
capabilities: allow nice if we are privileged
We allow task A to change B's nice level if it has a supserset of
B's privileges, or of it has CAP_SYS_NICE. Also allow it if A has
CAP_SYS_NICE with respect to B - meaning it is root in the same
namespace, or it created B's namespace.
Signed-off-by: Serge Hallyn <serge.hallyn@canonical.com>
Reviewed-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
| -rw-r--r-- | security/commoncap.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/security/commoncap.c b/security/commoncap.c index 9fccf71b2b62..b9d613e0ef14 100644 --- a/security/commoncap.c +++ b/security/commoncap.c @@ -768,16 +768,16 @@ int cap_task_fix_setuid(struct cred *new, const struct cred *old, int flags) */ static int cap_safe_nice(struct task_struct *p) { - int is_subset; + int is_subset, ret = 0; rcu_read_lock(); is_subset = cap_issubset(__task_cred(p)->cap_permitted, current_cred()->cap_permitted); + if (!is_subset && !ns_capable(__task_cred(p)->user_ns, CAP_SYS_NICE)) + ret = -EPERM; rcu_read_unlock(); - if (!is_subset && !capable(CAP_SYS_NICE)) - return -EPERM; - return 0; + return ret; } /** |
