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authorKay Sievers <kay.sievers@vrfy.org>2010-01-13 16:16:36 +0300
committerGreg Kroah-Hartman <gregkh@suse.de>2010-03-08 04:04:48 +0300
commit5e31d76f2817bd50258a092a7c5b15b3006fd61c (patch)
tree736c73c564635d767a1592cc540a23695b96c6a3 /drivers/base/devtmpfs.c
parent0933e2d98d1b170ef62d48e18157f5dc43b58217 (diff)
downloadlinux-5e31d76f2817bd50258a092a7c5b15b3006fd61c.tar.xz
Driver-Core: devtmpfs - reset inode permissions before unlinking
Before unlinking the inode, reset the current permissions of possible references like hardlinks, so granted permissions can not be retained across the device lifetime by creating hardlinks, in the unusual case that there is a user-writable directory on the same filesystem. Signed-off-by: Kay Sievers <kay.sievers@vrfy.org> Cc: stable <stable@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/base/devtmpfs.c')
-rw-r--r--drivers/base/devtmpfs.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/base/devtmpfs.c b/drivers/base/devtmpfs.c
index 42ae452b36b0..dac478c6e460 100644
--- a/drivers/base/devtmpfs.c
+++ b/drivers/base/devtmpfs.c
@@ -301,6 +301,19 @@ int devtmpfs_delete_node(struct device *dev)
if (dentry->d_inode) {
err = vfs_getattr(nd.path.mnt, dentry, &stat);
if (!err && dev_mynode(dev, dentry->d_inode, &stat)) {
+ struct iattr newattrs;
+ /*
+ * before unlinking this node, reset permissions
+ * of possible references like hardlinks
+ */
+ newattrs.ia_uid = 0;
+ newattrs.ia_gid = 0;
+ newattrs.ia_mode = stat.mode & ~0777;
+ newattrs.ia_valid =
+ ATTR_UID|ATTR_GID|ATTR_MODE;
+ mutex_lock(&dentry->d_inode->i_mutex);
+ notify_change(dentry, &newattrs);
+ mutex_unlock(&dentry->d_inode->i_mutex);
err = vfs_unlink(nd.path.dentry->d_inode,
dentry);
if (!err || err == -ENOENT)