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| author | Al Viro <viro@zeniv.linux.org.uk> | 2011-06-19 21:01:04 +0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2011-06-20 18:46:04 +0400 |
| commit | 482e0cd3dbaa70f2a2bead4b5f2c0d203ef654ba (patch) | |
| tree | 68d885682da34a08c29908d012a356344882a487 | |
| parent | 8e833fd2e1f0107ee7a4b6bc4de3c9f0e9b0ed41 (diff) | |
| download | linux-482e0cd3dbaa70f2a2bead4b5f2c0d203ef654ba.tar.xz | |
devcgroup_inode_permission: take "is it a device node" checks to inlined wrapper
inode_permission() calls devcgroup_inode_permission() and almost all such
calls are _not_ for device nodes; let's at least keep the common path
straight...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| -rw-r--r-- | include/linux/device_cgroup.h | 10 | ||||
| -rw-r--r-- | security/device_cgroup.c | 8 |
2 files changed, 10 insertions, 8 deletions
diff --git a/include/linux/device_cgroup.h b/include/linux/device_cgroup.h index 0b0d9c39ed67..7aad1f440867 100644 --- a/include/linux/device_cgroup.h +++ b/include/linux/device_cgroup.h @@ -2,8 +2,16 @@ #include <linux/fs.h> #ifdef CONFIG_CGROUP_DEVICE -extern int devcgroup_inode_permission(struct inode *inode, int mask); +extern int __devcgroup_inode_permission(struct inode *inode, int mask); extern int devcgroup_inode_mknod(int mode, dev_t dev); +static inline int devcgroup_inode_permission(struct inode *inode, int mask) +{ + if (likely(!inode->i_rdev)) + return 0; + if (!S_ISBLK(inode->i_mode) && !S_ISCHR(inode->i_mode)) + return 0; + return __devcgroup_inode_permission(inode, mask); +} #else static inline int devcgroup_inode_permission(struct inode *inode, int mask) { return 0; } diff --git a/security/device_cgroup.c b/security/device_cgroup.c index cd1f779fa51d..1be68269e1c2 100644 --- a/security/device_cgroup.c +++ b/security/device_cgroup.c @@ -474,17 +474,11 @@ struct cgroup_subsys devices_subsys = { .subsys_id = devices_subsys_id, }; -int devcgroup_inode_permission(struct inode *inode, int mask) +int __devcgroup_inode_permission(struct inode *inode, int mask) { struct dev_cgroup *dev_cgroup; struct dev_whitelist_item *wh; - dev_t device = inode->i_rdev; - if (!device) - return 0; - if (!S_ISBLK(inode->i_mode) && !S_ISCHR(inode->i_mode)) - return 0; - rcu_read_lock(); dev_cgroup = task_devcgroup(current); |