[PATCH] Fix listxattr() for generic security attributes

Commit f549d6c18c0e8e6cf1bf0e7a47acc1daf7e2cec1 introduced a generic
fallback for security xattrs, but appears to include a subtle bug.

Gentoo users with kernels with selinux compiled in, and coreutils compiled
with acl support, noticed that they could not copy files on tmpfs using
'cp'.

cp (compiled with acl support) copies the file, lists the extended
attributes on the old file, copies them all to the new file, and then
exits.  However the listxattr() calls were failing with this odd behaviour:

llistxattr("a.out", (nil), 0)           = 17
llistxattr("a.out", 0x7fffff8c6cb0, 17) = -1 ERANGE (Numerical result out of
range)

I believe this is a simple problem in the logic used to check the buffer
sizes; if the user sends a buffer the exact size of the data, then its ok
:)

This change solves the problem.
More info can be found at http://bugs.gentoo.org/113138

Signed-off-by: Daniel Drake <dsd@gentoo.org>
Acked-by: James Morris <jmorris@namei.org>
Acked-by: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/fs/xattr.c b/fs/xattr.c
index a9db225579983b4babe40ac4c47a9eef0a3250cb..bcc2156d4d2873d0c3a7b0841a4cdaf1fa456e22 100644 (file)
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -245,7 +245,7 @@ listxattr(struct dentry *d, char __user *list, size_t size)
                error = d->d_inode->i_op->listxattr(d, klist, size);
        } else {
                error = security_inode_listsecurity(d->d_inode, klist, size);
-               if (size && error >= size)
+               if (size && error > size)
                        error = -ERANGE;
        }
        if (error > 0) {