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security: prevent permission checking of file removal via sysfs_remove_group()

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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>
This commit is contained in:
James Morris
2007-04-26 00:12:05 -07:00
committed by Greg Kroah-Hartman
parent 523ded71de
commit 057f6c019f
3 changed files with 57 additions and 22 deletions
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6
fs/sysfs/group.c
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@@ -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);