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| author | Eric W. Biederman <ebiederm@xmission.com> | 2011-11-16 23:15:31 -0800 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2012-04-07 16:55:51 -0700 |
| commit | c4a4d603796c727b9555867571f89483be9c565e (patch) | |
| tree | ae3b47a7b8b35c866df53cb4b4a051d49a28904a /kernel/ptrace.c | |
| parent | 7e6bd8fadd1216f50468f965d0308f45e5109ced (diff) | |
| download | lwn-c4a4d603796c727b9555867571f89483be9c565e.tar.gz lwn-c4a4d603796c727b9555867571f89483be9c565e.zip | |
userns: Use cred->user_ns instead of cred->user->user_ns
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 <serge.hallyn@canonical.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Diffstat (limited to 'kernel/ptrace.c')
| -rw-r--r-- | kernel/ptrace.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/ptrace.c b/kernel/ptrace.c index ee8d49b9c309..24e0a5a94824 100644 --- a/kernel/ptrace.c +++ b/kernel/ptrace.c @@ -198,7 +198,7 @@ int __ptrace_may_access(struct task_struct *task, unsigned int mode) return 0; rcu_read_lock(); tcred = __task_cred(task); - if (cred->user->user_ns == tcred->user->user_ns && + if (cred->user_ns == tcred->user_ns && (cred->uid == tcred->euid && cred->uid == tcred->suid && cred->uid == tcred->uid && @@ -206,7 +206,7 @@ int __ptrace_may_access(struct task_struct *task, unsigned int mode) cred->gid == tcred->sgid && cred->gid == tcred->gid)) goto ok; - if (ptrace_has_cap(tcred->user->user_ns, mode)) + if (ptrace_has_cap(tcred->user_ns, mode)) goto ok; rcu_read_unlock(); return -EPERM; |