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authorJames Morris <jmorris@namei.org>2007-04-26 03:12:05 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2007-04-27 13:57:33 -0400
commit057f6c019fff9ee290641d50647359bb8898918e (patch)
treec051a915e2038825dd2f50f24fc28abb3c4a5e79 /include/linux
parent523ded71de0c5e66973335bf99a80edfda9f401b (diff)
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 'include/linux')
-rw-r--r--include/linux/namei.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/namei.h b/include/linux/namei.h
index d39a5a67e979..b7dd24917f0d 100644
--- a/include/linux/namei.h
+++ b/include/linux/namei.h
@@ -82,6 +82,7 @@ extern struct file *nameidata_to_filp(struct nameidata *nd, int flags);
82extern void release_open_intent(struct nameidata *); 82extern void release_open_intent(struct nameidata *);
83 83
84extern struct dentry * lookup_one_len(const char *, struct dentry *, int); 84extern struct dentry * lookup_one_len(const char *, struct dentry *, int);
85extern struct dentry *lookup_one_len_kern(const char *, struct dentry *, int);
85 86
86extern int follow_down(struct vfsmount **, struct dentry **); 87extern int follow_down(struct vfsmount **, struct dentry **);
87extern int follow_up(struct vfsmount **, struct dentry **); 88extern int follow_up(struct vfsmount **, struct dentry **);