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authorDaniel Drake <dsd@gentoo.org>2005-12-12 00:37:08 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2005-12-12 08:57:42 -0800
commit894ec8707ced240b96dc45944790fb35d9a6b03c (patch)
tree6498b7f6606027f3a52417431222b7a69c43391d
parentc3f5902325d3053986e7359f706581d8f032e72f (diff)
[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>
-rw-r--r--fs/xattr.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/xattr.c b/fs/xattr.c
index a9db22557998..bcc2156d4d28 100644
--- 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) {