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| author | James Morris <jmorris@namei.org> | 2007-04-26 00:12:05 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2007-04-27 10:57:33 -0700 |
| commit | 057f6c019fff9ee290641d50647359bb8898918e (patch) | |
| tree | c051a915e2038825dd2f50f24fc28abb3c4a5e79 /fs/sysfs/group.c | |
| parent | 523ded71de0c5e66973335bf99a80edfda9f401b (diff) | |
| download | lwn-057f6c019fff9ee290641d50647359bb8898918e.tar.gz lwn-057f6c019fff9ee290641d50647359bb8898918e.zip | |
security: prevent permission checking of file removal via sysfs_remove_group()
Prevent permission checking from being performed when the kernel wants to
unconditionally remove a sysfs group, by introducing an kernel-only variant
of lookup_one_len(), lookup_one_len_kern().
Additionally, as sysfs_remove_group() does not check the return value of
the lookup before using it, a BUG_ON has been added to pinpoint the cause
of any problems potentially caused by this (and as a form of annotation).
Signed-off-by: James Morris <jmorris@namei.org>
Cc: Nagendra Singh Tomar <nagendra_tomar@adaptec.com>
Cc: Tejun Heo <htejun@gmail.com>
Cc: Stephen Smalley <sds@tycho.nsa.gov>
Cc: Eric Paris <eparis@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'fs/sysfs/group.c')
| -rw-r--r-- | fs/sysfs/group.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/fs/sysfs/group.c b/fs/sysfs/group.c index b20951c93761..52eed2a7a5ef 100644 --- a/fs/sysfs/group.c +++ b/fs/sysfs/group.c @@ -70,9 +70,11 @@ void sysfs_remove_group(struct kobject * kobj, { struct dentry * dir; - if (grp->name) - dir = lookup_one_len(grp->name, kobj->dentry, + if (grp->name) { + dir = lookup_one_len_kern(grp->name, kobj->dentry, strlen(grp->name)); + BUG_ON(IS_ERR(dir)); + } else dir = dget(kobj->dentry); |