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cgroups: fix a serious bug in cgroupstats 

Try this, and you'll get oops immediately:
 # cd Documentation/accounting/
 # gcc -o getdelays getdelays.c
 # mount -t cgroup -o debug xxx /mnt
 # ./getdelays -C /mnt/tasks

Because a normal file's dentry->d_fsdata is a pointer to struct cftype,
not struct cgroup.

After the patch, it returns EINVAL if we try to get cgroupstats
from a normal file.

Cc: Balbir Singh <balbir@linux.vnet.ibm.com>
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Paul Menage <menage@google.com>
Cc: <stable@kernel.org>		[2.6.25.x, 2.6.26.x, 2.6.27.x]
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 2008-11-19 15:36:48 -08:00 committed by Linus Torvalds
parent ea7e743e49
commit 33d283bef2
1 changed files with 5 additions and 2 deletions
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7
kernel/cgroup.c
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@ -2039,10 +2039,13 @@ int cgroupstats_build(struct cgroupstats *stats, struct dentry *dentry)
struct cgroup *cgrp; struct cgroup *cgrp;
struct cgroup_iter it; struct cgroup_iter it;
struct task_struct *tsk; struct task_struct *tsk;
/* /*
* Validate dentry by checking the superblock operations * Validate dentry by checking the superblock operations,
* and make sure it's a directory.
*/ */
if (dentry->d_sb->s_op != &cgroup_ops) if (dentry->d_sb->s_op != &cgroup_ops ||
!S_ISDIR(dentry->d_inode->i_mode))
goto err; goto err;
ret = 0; ret = 0;