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authorAl Viro <viro@zeniv.linux.org.uk>2014-03-20 23:18:22 +0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-04-03 23:02:34 +0400
commit7ce510b1e42d51dfbf2e184778039a34dbba6131 (patch)
treec4a9b2750b2654a7f48e583ae2ee2b51d8e013f6 /fs
parentda49d7d6349af87e838f881f593337c9459d883a (diff)
downloadlinux-7ce510b1e42d51dfbf2e184778039a34dbba6131.tar.xz
rcuwalk: recheck mount_lock after mountpoint crossing attempts
commit b37199e626b31e1175fb06764c5d1d687723aac2 upstream. We can get false negative from __lookup_mnt() if an unrelated vfsmount gets moved. In that case legitimize_mnt() is guaranteed to fail, and we will fall back to non-RCU walk... unless we end up running into a hard error on a filesystem object we wouldn't have reached if not for that false negative. IOW, delaying that check until the end of pathname resolution is wrong - we should recheck right after we attempt to cross the mountpoint. We don't need to recheck unless we see d_mountpoint() being true - in that case even if we have just raced with mount/umount, we can simply go on as if we'd come at the moment when the sucker wasn't a mountpoint; if we run into a hard error as the result, it was a legitimate outcome. __lookup_mnt() returning NULL is different in that respect, since it might've happened due to operation on completely unrelated mountpoint. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/namei.c29
1 files changed, 13 insertions, 16 deletions
diff --git a/fs/namei.c b/fs/namei.c
index cfe660870251..399f6378de54 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1098,7 +1098,7 @@ static bool __follow_mount_rcu(struct nameidata *nd, struct path *path,
return false;
if (!d_mountpoint(path->dentry))
- break;
+ return true;
mounted = __lookup_mnt(path->mnt, path->dentry);
if (!mounted)
@@ -1114,20 +1114,7 @@ static bool __follow_mount_rcu(struct nameidata *nd, struct path *path,
*/
*inode = path->dentry->d_inode;
}
- return true;
-}
-
-static void follow_mount_rcu(struct nameidata *nd)
-{
- while (d_mountpoint(nd->path.dentry)) {
- struct mount *mounted;
- mounted = __lookup_mnt(nd->path.mnt, nd->path.dentry);
- if (!mounted)
- break;
- nd->path.mnt = &mounted->mnt;
- nd->path.dentry = mounted->mnt.mnt_root;
- nd->seq = read_seqcount_begin(&nd->path.dentry->d_seq);
- }
+ return read_seqretry(&mount_lock, nd->m_seq);
}
static int follow_dotdot_rcu(struct nameidata *nd)
@@ -1155,7 +1142,17 @@ static int follow_dotdot_rcu(struct nameidata *nd)
break;
nd->seq = read_seqcount_begin(&nd->path.dentry->d_seq);
}
- follow_mount_rcu(nd);
+ while (d_mountpoint(nd->path.dentry)) {
+ struct mount *mounted;
+ mounted = __lookup_mnt(nd->path.mnt, nd->path.dentry);
+ if (!mounted)
+ break;
+ nd->path.mnt = &mounted->mnt;
+ nd->path.dentry = mounted->mnt.mnt_root;
+ nd->seq = read_seqcount_begin(&nd->path.dentry->d_seq);
+ if (!read_seqretry(&mount_lock, nd->m_seq))
+ goto failed;
+ }
nd->inode = nd->path.dentry->d_inode;
return 0;