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devcgroup: skip superfluous checks when found the DEV_ALL elem 

While walking through the whitelist, if the DEV_ALL item is found, no more
check is needed.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Li Zefan 2009-06-17 16:26:33 -07:00 committed by Linus Torvalds
parent f9ab5b5b0f
commit cd5008196f
1 changed files with 6 additions and 4 deletions
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10
security/device_cgroup.c
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@ -490,7 +490,7 @@ int devcgroup_inode_permission(struct inode *inode, int mask)
list_for_each_entry_rcu(wh, &dev_cgroup->whitelist, list) {
if (wh->type & DEV_ALL)
goto acc_check;
goto found;
if ((wh->type & DEV_BLOCK) && !S_ISBLK(inode->i_mode))
continue;
if ((wh->type & DEV_CHAR) && !S_ISCHR(inode->i_mode))
@ -499,11 +499,12 @@ int devcgroup_inode_permission(struct inode *inode, int mask)
continue;
if (wh->minor != ~0 && wh->minor != iminor(inode))
continue;
acc_check:
if ((mask & MAY_WRITE) && !(wh->access & ACC_WRITE))
continue;
if ((mask & MAY_READ) && !(wh->access & ACC_READ))
continue;
found:
rcu_read_unlock();
return 0;
}
@ -527,7 +528,7 @@ int devcgroup_inode_mknod(int mode, dev_t dev)
list_for_each_entry_rcu(wh, &dev_cgroup->whitelist, list) {
if (wh->type & DEV_ALL)
goto acc_check;
goto found;
if ((wh->type & DEV_BLOCK) && !S_ISBLK(mode))
continue;
if ((wh->type & DEV_CHAR) && !S_ISCHR(mode))
@ -536,9 +537,10 @@ int devcgroup_inode_mknod(int mode, dev_t dev)
continue;
if (wh->minor != ~0 && wh->minor != MINOR(dev))
continue;
acc_check:
if (!(wh->access & ACC_MKNOD))
continue;
found:
rcu_read_unlock();
return 0;
}