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userns: Use cred->user_ns instead of cred->user->user_ns

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Optimize performance and prepare for the removal of the user_ns reference
from user_struct.  Remove the slow long walk through cred->user->user_ns and
instead go straight to cred->user_ns.

Acked-by: Serge Hallyn <[email protected]>
Signed-off-by: Eric W. Biederman <[email protected]>
This commit is contained in:
Eric W. Biederman 2011-11-16 23:15:31 -08:00
commit c4a4d60379
12 changed files with 24 additions and 24 deletions
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4
kernel/signal.c
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@ -767,14 +767,14 @@ static int kill_ok_by_cred(struct task_struct *t)
const struct cred *cred = current_cred();
const struct cred *tcred = __task_cred(t);
if (cred->user->user_ns == tcred->user->user_ns &&
if (cred->user_ns == tcred->user_ns &&
(cred->euid == tcred->suid ||
cred->euid == tcred->uid ||
cred->uid == tcred->suid ||
cred->uid == tcred->uid))
return 1;
if (ns_capable(tcred->user->user_ns, CAP_KILL))
if (ns_capable(tcred->user_ns, CAP_KILL))
return 1;
return 0;