This is a note to let you know that I've just added the patch titled
gfs2: Always check inode size of inline inodes
to the 4.19-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:
gfs2-always-check-inode-size-of-inline-inodes.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 70376c7ff31221f1d21db5611d8209e677781d3a Mon Sep 17 00:00:00 2001
From: Andreas Gruenbacher <agruenba@xxxxxxxxxx>
Date: Sun, 4 Dec 2022 17:00:04 +0100
Subject: gfs2: Always check inode size of inline inodes
From: Andreas Gruenbacher <agruenba@xxxxxxxxxx>
commit 70376c7ff31221f1d21db5611d8209e677781d3a upstream.
Check if the inode size of stuffed (inline) inodes is within the allowed
range when reading inodes from disk (gfs2_dinode_in()). This prevents
us from on-disk corruption.
The two checks in stuffed_readpage() and gfs2_unstuffer_page() that just
truncate inline data to the maximum allowed size don't actually make
sense, and they can be removed now as well.
Reported-by: syzbot+7bb81dfa9cda07d9cd9d@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Andreas Gruenbacher <agruenba@xxxxxxxxxx>
[pchelkin@xxxxxxxxx: adjust the inode variable inside gfs2_dinode_in with
the format used before upstream commit 7db354444ad8 ("gfs2: Cosmetic
gfs2_dinode_{in,out} cleanup")]
Signed-off-by: Fedor Pchelkin <pchelkin@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/gfs2/aops.c | 2 --
fs/gfs2/bmap.c | 3 ---
fs/gfs2/glops.c | 3 +++
3 files changed, 3 insertions(+), 5 deletions(-)
--- a/fs/gfs2/aops.c
+++ b/fs/gfs2/aops.c
@@ -480,8 +480,6 @@ int stuffed_readpage(struct gfs2_inode *
return error;
kaddr = kmap_atomic(page);
- if (dsize > gfs2_max_stuffed_size(ip))
- dsize = gfs2_max_stuffed_size(ip);
memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode), dsize);
memset(kaddr + dsize, 0, PAGE_SIZE - dsize);
kunmap_atomic(kaddr);
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -72,9 +72,6 @@ static int gfs2_unstuffer_page(struct gf
void *kaddr = kmap(page);
u64 dsize = i_size_read(inode);
- if (dsize > gfs2_max_stuffed_size(ip))
- dsize = gfs2_max_stuffed_size(ip);
-
memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode), dsize);
memset(kaddr + dsize, 0, PAGE_SIZE - dsize);
kunmap(page);
--- a/fs/gfs2/glops.c
+++ b/fs/gfs2/glops.c
@@ -388,6 +388,9 @@ static int gfs2_dinode_in(struct gfs2_in
ip->i_depth = (u8)depth;
ip->i_entries = be32_to_cpu(str->di_entries);
+ if (gfs2_is_stuffed(ip) && ip->i_inode.i_size > gfs2_max_stuffed_size(ip))
+ goto corrupt;
+
if (S_ISREG(ip->i_inode.i_mode))
gfs2_set_aops(&ip->i_inode);
Patches currently in stable-queue which might be from agruenba@xxxxxxxxxx are
queue-4.19/gfs2-always-check-inode-size-of-inline-inodes.patch
