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[PATCH] smbfs chroot issue (CVE-2006-1864)

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Mark Moseley reported that a chroot environment on a SMB share can be left
via "cd ..\\".  Similar to CVE-2006-1863 issue with cifs, this fix is for
smbfs.

Steven French <sfrench@us.ibm.com> wrote:

Looks fine to me.  This should catch the slash on lookup or equivalent,
which will be all obvious paths of interest.

Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Olaf Kirch 2006-05-15 09:43:57 -07:00 committed by Linus Torvalds
parent a7b862f663
commit 3b7c810827
1 changed files with 5 additions and 0 deletions
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5
fs/smbfs/dir.c
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@ -434,6 +434,11 @@ smb_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
if (dentry->d_name.len > SMB_MAXNAMELEN)
goto out;
/* Do not allow lookup of names with backslashes in */
error = -EINVAL;
if (memchr(dentry->d_name.name, '\\', dentry->d_name.len))
goto out;
lock_kernel();
error = smb_proc_getattr(dentry, &finfo);
#ifdef SMBFS_PARANOIA