This is a note to let you know that I've just added the patch titled
ext4: add ext4_iget_normal() which is to be used for dir tree lookups
to the 3.17-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ext4-add-ext4_iget_normal-which-is-to-be-used-for-dir-tree-lookups.patch
and it can be found in the queue-3.17 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From f4bb2981024fc91b23b4d09a8817c415396dbabb Mon Sep 17 00:00:00 2001
From: Theodore Ts'o <[email protected]>
Date: Sun, 5 Oct 2014 22:56:00 -0400
Subject: ext4: add ext4_iget_normal() which is to be used for dir tree lookups
From: Theodore Ts'o <[email protected]>
commit f4bb2981024fc91b23b4d09a8817c415396dbabb upstream.
If there is a corrupted file system which has directory entries that
point at reserved, metadata inodes, prohibit them from being used by
treating them the same way we treat Boot Loader inodes --- that is,
mark them to be bad inodes. This prohibits them from being opened,
deleted, or modified via chmod, chown, utimes, etc.
In particular, this prevents a corrupted file system which has a
directory entry which points at the journal inode from being deleted
and its blocks released, after which point Much Hilarity Ensues.
Reported-by: Sami Liedes <[email protected]>
Signed-off-by: Theodore Ts'o <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
fs/ext4/ext4.h | 1 +
fs/ext4/inode.c | 7 +++++++
fs/ext4/namei.c | 4 ++--
fs/ext4/super.c | 2 +-
4 files changed, 11 insertions(+), 3 deletions(-)
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -2109,6 +2109,7 @@ int do_journal_get_write_access(handle_t
#define CONVERT_INLINE_DATA 2
extern struct inode *ext4_iget(struct super_block *, unsigned long);
+extern struct inode *ext4_iget_normal(struct super_block *, unsigned long);
extern int ext4_write_inode(struct inode *, struct writeback_control *);
extern int ext4_setattr(struct dentry *, struct iattr *);
extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -4127,6 +4127,13 @@ bad_inode:
return ERR_PTR(ret);
}
+struct inode *ext4_iget_normal(struct super_block *sb, unsigned long ino)
+{
+ if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
+ return ERR_PTR(-EIO);
+ return ext4_iget(sb, ino);
+}
+
static int ext4_inode_blocks_set(handle_t *handle,
struct ext4_inode *raw_inode,
struct ext4_inode_info *ei)
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -1441,7 +1441,7 @@ static struct dentry *ext4_lookup(struct
dentry);
return ERR_PTR(-EIO);
}
- inode = ext4_iget(dir->i_sb, ino);
+ inode = ext4_iget_normal(dir->i_sb, ino);
if (inode == ERR_PTR(-ESTALE)) {
EXT4_ERROR_INODE(dir,
"deleted inode referenced: %u",
@@ -1474,7 +1474,7 @@ struct dentry *ext4_get_parent(struct de
return ERR_PTR(-EIO);
}
- return d_obtain_alias(ext4_iget(child->d_inode->i_sb, ino));
+ return d_obtain_alias(ext4_iget_normal(child->d_inode->i_sb, ino));
}
/*
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1002,7 +1002,7 @@ static struct inode *ext4_nfs_get_inode(
* Currently we don't know the generation for parent directory, so
* a generation of 0 means "accept any"
*/
- inode = ext4_iget(sb, ino);
+ inode = ext4_iget_normal(sb, ino);
if (IS_ERR(inode))
return ERR_CAST(inode);
if (generation && inode->i_generation != generation) {
Patches currently in stable-queue which might be from [email protected] are
queue-3.17/ext4-check-s_chksum_driver-when-looking-for-bg-csum-presence.patch
queue-3.17/ext4-check-ea-value-offset-when-loading.patch
queue-3.17/ext4-fix-reservation-overflow-in-ext4_da_write_begin.patch
queue-3.17/ext4-don-t-check-quota-format-when-there-are-no-quota-files.patch
queue-3.17/jbd2-free-bh-when-descriptor-block-checksum-fails.patch
queue-3.17/ext4-prevent-bugon-on-race-between-write-fcntl.patch
queue-3.17/ext4-fix-oops-when-loading-block-bitmap-failed.patch
queue-3.17/vfs-fix-data-corruption-when-blocksize-pagesize-for-mmaped-data.patch
queue-3.17/ext4-move-error-report-out-of-atomic-context-in-ext4_init_block_bitmap.patch
queue-3.17/ext4-replace-open-coded-mdata-csum-feature-to-helper-function.patch
queue-3.17/ext4-fix-mmap-data-corruption-when-blocksize-pagesize.patch
queue-3.17/ext4-don-t-orphan-or-truncate-the-boot-loader-inode.patch
queue-3.17/ext4-add-ext4_iget_normal-which-is-to-be-used-for-dir-tree-lookups.patch
queue-3.17/random-add-and-use-memzero_explicit-for-clearing-data.patch
queue-3.17/ext4-fix-overflow-when-updating-superblock-backups-after-resize.patch
queue-3.17/ext4-enable-journal-checksum-when-metadata-checksum-feature-enabled.patch
queue-3.17/ext4-grab-missed-write_count-for-ext4_ioc_swap_boot.patch
--
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