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authorEric W. Biederman <ebiederm@xmission.com>2011-11-17 11:15:31 +0400
committerEric W. Biederman <ebiederm@xmission.com>2012-04-08 03:55:51 +0400
commitc4a4d603796c727b9555867571f89483be9c565e (patch)
treeae3b47a7b8b35c866df53cb4b4a051d49a28904a /security
parent7e6bd8fadd1216f50468f965d0308f45e5109ced (diff)
downloadlinux-c4a4d603796c727b9555867571f89483be9c565e.tar.xz
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 'security')
-rw-r--r--security/commoncap.c14
-rw-r--r--security/keys/key.c2
-rw-r--r--security/keys/permission.c2
-rw-r--r--security/keys/process_keys.c2
4 files changed, 10 insertions, 10 deletions
diff --git a/security/commoncap.c b/security/commoncap.c
index 0cf4b53480a7..8b3e10e2eac7 100644
--- a/security/commoncap.c
+++ b/security/commoncap.c
@@ -81,7 +81,7 @@ int cap_capable(const struct cred *cred, struct user_namespace *targ_ns,
return 0;
/* Do we have the necessary capabilities? */
- if (targ_ns == cred->user->user_ns)
+ if (targ_ns == cred->user_ns)
return cap_raised(cred->cap_effective, cap) ? 0 : -EPERM;
/* Have we tried all of the parent namespaces? */
@@ -136,10 +136,10 @@ int cap_ptrace_access_check(struct task_struct *child, unsigned int mode)
rcu_read_lock();
cred = current_cred();
child_cred = __task_cred(child);
- if (cred->user->user_ns == child_cred->user->user_ns &&
+ if (cred->user_ns == child_cred->user_ns &&
cap_issubset(child_cred->cap_permitted, cred->cap_permitted))
goto out;
- if (ns_capable(child_cred->user->user_ns, CAP_SYS_PTRACE))
+ if (ns_capable(child_cred->user_ns, CAP_SYS_PTRACE))
goto out;
ret = -EPERM;
out:
@@ -168,10 +168,10 @@ int cap_ptrace_traceme(struct task_struct *parent)
rcu_read_lock();
cred = __task_cred(parent);
child_cred = current_cred();
- if (cred->user->user_ns == child_cred->user->user_ns &&
+ if (cred->user_ns == child_cred->user_ns &&
cap_issubset(child_cred->cap_permitted, cred->cap_permitted))
goto out;
- if (has_ns_capability(parent, child_cred->user->user_ns, CAP_SYS_PTRACE))
+ if (has_ns_capability(parent, child_cred->user_ns, CAP_SYS_PTRACE))
goto out;
ret = -EPERM;
out:
@@ -214,7 +214,7 @@ static inline int cap_inh_is_capped(void)
/* they are so limited unless the current task has the CAP_SETPCAP
* capability
*/
- if (cap_capable(current_cred(), current_cred()->user->user_ns,
+ if (cap_capable(current_cred(), current_cred()->user_ns,
CAP_SETPCAP, SECURITY_CAP_AUDIT) == 0)
return 0;
return 1;
@@ -866,7 +866,7 @@ int cap_task_prctl(int option, unsigned long arg2, unsigned long arg3,
|| ((new->securebits & SECURE_ALL_LOCKS & ~arg2)) /*[2]*/
|| (arg2 & ~(SECURE_ALL_LOCKS | SECURE_ALL_BITS)) /*[3]*/
|| (cap_capable(current_cred(),
- current_cred()->user->user_ns, CAP_SETPCAP,
+ current_cred()->user_ns, CAP_SETPCAP,
SECURITY_CAP_AUDIT) != 0) /*[4]*/
/*
* [1] no changing of bits that are locked
diff --git a/security/keys/key.c b/security/keys/key.c
index 06783cffb3af..7e6034793af3 100644
--- a/security/keys/key.c
+++ b/security/keys/key.c
@@ -253,7 +253,7 @@ struct key *key_alloc(struct key_type *type, const char *desc,
quotalen = desclen + type->def_datalen;
/* get hold of the key tracking for this user */
- user = key_user_lookup(uid, cred->user->user_ns);
+ user = key_user_lookup(uid, cred->user_ns);
if (!user)
goto no_memory_1;
diff --git a/security/keys/permission.c b/security/keys/permission.c
index c35b5229e3cd..e146cbd714bd 100644
--- a/security/keys/permission.c
+++ b/security/keys/permission.c
@@ -36,7 +36,7 @@ int key_task_permission(const key_ref_t key_ref, const struct cred *cred,
key = key_ref_to_ptr(key_ref);
- if (key->user->user_ns != cred->user->user_ns)
+ if (key->user->user_ns != cred->user_ns)
goto use_other_perms;
/* use the second 8-bits of permissions for keys the caller owns */
diff --git a/security/keys/process_keys.c b/security/keys/process_keys.c
index be7ecb2018dd..70febff06da9 100644
--- a/security/keys/process_keys.c
+++ b/security/keys/process_keys.c
@@ -858,7 +858,7 @@ void key_replace_session_keyring(void)
new-> sgid = old-> sgid;
new->fsgid = old->fsgid;
new->user = get_uid(old->user);
- new->user_ns = new->user->user_ns;
+ new->user_ns = new->user_ns;
new->group_info = get_group_info(old->group_info);
new->securebits = old->securebits;