From e2bfb088fac03c0f621886a04cffc7faa2b49b1d Mon Sep 17 00:00:00 2001 From: Theodore Ts'o Date: Sun, 5 Oct 2014 22:47:07 -0400 Subject: ext4: don't orphan or truncate the boot loader inode The boot loader inode (inode #5) should never be visible in the directory hierarchy, but it's possible if the file system is corrupted that there will be a directory entry that points at inode #5. In order to avoid accidentally trashing it, when such a directory inode is opened, the inode will be marked as a bad inode, so that it's not possible to modify (or read) the inode from userspace. Unfortunately, when we unlink this (invalid/illegal) directory entry, we will put the bad inode on the ophan list, and then when try to unlink the directory, we don't actually remove the bad inode from the orphan list before freeing in-memory inode structure. This means the in-memory orphan list is corrupted, leading to a kernel oops. In addition, avoid truncating a bad inode in ext4_destroy_inode(), since truncating the boot loader inode is not a smart thing to do. Reported-by: Sami Liedes Reviewed-by: Jan Kara Signed-off-by: Theodore Ts'o Cc: stable@vger.kernel.org diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 41c4f97..59983b2 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -224,16 +224,15 @@ void ext4_evict_inode(struct inode *inode) goto no_delete; } - if (!is_bad_inode(inode)) - dquot_initialize(inode); + if (is_bad_inode(inode)) + goto no_delete; + dquot_initialize(inode); if (ext4_should_order_data(inode)) ext4_begin_ordered_truncate(inode, 0); truncate_inode_pages_final(&inode->i_data); WARN_ON(atomic_read(&EXT4_I(inode)->i_ioend_count)); - if (is_bad_inode(inode)) - goto no_delete; /* * Protect us against freezing - iput() caller didn't have to have any diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c index 51705f8..a2a9d40 100644 --- a/fs/ext4/namei.c +++ b/fs/ext4/namei.c @@ -2544,7 +2544,7 @@ int ext4_orphan_add(handle_t *handle, struct inode *inode) int err = 0, rc; bool dirty = false; - if (!sbi->s_journal) + if (!sbi->s_journal || is_bad_inode(inode)) return 0; WARN_ON_ONCE(!(inode->i_state & (I_NEW | I_FREEING)) && -- cgit v0.10.2