This is a note to let you know that I've just added the patch titled
f2fs: sanity check checkpoint segno and blkoff
to the 4.4-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:
f2fs-sanity-check-checkpoint-segno-and-blkoff.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 15d3042a937c13f5d9244241c7a9c8416ff6e82a Mon Sep 17 00:00:00 2001
From: Jin Qian <jinqian@xxxxxxxxxx>
Date: Mon, 15 May 2017 10:45:08 -0700
Subject: f2fs: sanity check checkpoint segno and blkoff
From: Jin Qian <jinqian@xxxxxxxxxx>
commit 15d3042a937c13f5d9244241c7a9c8416ff6e82a upstream.
Make sure segno and blkoff read from raw image are valid.
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Jin Qian <jinqian@xxxxxxxxxx>
[Jaegeuk Kim: adjust minor coding style]
Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
[AmitP: Found in Android Security bulletin for Aug'17, fixes CVE-2017-10663]
Signed-off-by: Amit Pundir <amit.pundir@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/f2fs/super.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -1078,6 +1078,8 @@ static int sanity_check_ckpt(struct f2fs
unsigned int total, fsmeta;
struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
+ unsigned int main_segs, blocks_per_seg;
+ int i;
total = le32_to_cpu(raw_super->segment_count);
fsmeta = le32_to_cpu(raw_super->segment_count_ckpt);
@@ -1089,6 +1091,20 @@ static int sanity_check_ckpt(struct f2fs
if (unlikely(fsmeta >= total))
return 1;
+ main_segs = le32_to_cpu(raw_super->segment_count_main);
+ blocks_per_seg = sbi->blocks_per_seg;
+
+ for (i = 0; i < NR_CURSEG_NODE_TYPE; i++) {
+ if (le32_to_cpu(ckpt->cur_node_segno[i]) >= main_segs ||
+ le16_to_cpu(ckpt->cur_node_blkoff[i]) >= blocks_per_seg)
+ return 1;
+ }
+ for (i = 0; i < NR_CURSEG_DATA_TYPE; i++) {
+ if (le32_to_cpu(ckpt->cur_data_segno[i]) >= main_segs ||
+ le16_to_cpu(ckpt->cur_data_blkoff[i]) >= blocks_per_seg)
+ return 1;
+ }
+
if (unlikely(f2fs_cp_error(sbi))) {
f2fs_msg(sbi->sb, KERN_ERR, "A bug case: need to run fsck");
return 1;
Patches currently in stable-queue which might be from jinqian@xxxxxxxxxx are
queue-4.4/f2fs-sanity-check-checkpoint-segno-and-blkoff.patch