This is a note to let you know that I've just added the patch titled
ext4: fix BUG in ext4_mb_new_inode_pa() due to overflow
to the 5.15-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-fix-bug-in-ext4_mb_new_inode_pa-due-to-overflow.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From stable-owner@xxxxxxxxxxxxxxx Sat Oct 28 08:43:23 2023
From: Baokun Li <libaokun1@xxxxxxxxxx>
Date: Sat, 28 Oct 2023 14:47:48 +0800
Subject: ext4: fix BUG in ext4_mb_new_inode_pa() due to overflow
To: <stable@xxxxxxxxxxxxxxx>
Cc: <gregkh@xxxxxxxxxxxxxxxxxxx>, <sashal@xxxxxxxxxx>, <tytso@xxxxxxx>, <jack@xxxxxxx>, <ritesh.list@xxxxxxxxx>, <patches@xxxxxxxxxxxxxxx>, <yangerkun@xxxxxxxxxx>, <libaokun1@xxxxxxxxxx>, <stable@xxxxxxxxxx>
Message-ID: <20231028064749.833278-2-libaokun1@xxxxxxxxxx>
From: Baokun Li <libaokun1@xxxxxxxxxx>
commit bc056e7163ac7db945366de219745cf94f32a3e6 upstream.
When we calculate the end position of ext4_free_extent, this position may
be exactly where ext4_lblk_t (i.e. uint) overflows. For example, if
ac_g_ex.fe_logical is 4294965248 and ac_orig_goal_len is 2048, then the
computed end is 0x100000000, which is 0. If ac->ac_o_ex.fe_logical is not
the first case of adjusting the best extent, that is, new_bex_end > 0, the
following BUG_ON will be triggered:
=========================================================
kernel BUG at fs/ext4/mballoc.c:5116!
invalid opcode: 0000 [#1] PREEMPT SMP PTI
CPU: 3 PID: 673 Comm: xfs_io Tainted: G E 6.5.0-rc1+ #279
RIP: 0010:ext4_mb_new_inode_pa+0xc5/0x430
Call Trace:
<TASK>
ext4_mb_use_best_found+0x203/0x2f0
ext4_mb_try_best_found+0x163/0x240
ext4_mb_regular_allocator+0x158/0x1550
ext4_mb_new_blocks+0x86a/0xe10
ext4_ext_map_blocks+0xb0c/0x13a0
ext4_map_blocks+0x2cd/0x8f0
ext4_iomap_begin+0x27b/0x400
iomap_iter+0x222/0x3d0
__iomap_dio_rw+0x243/0xcb0
iomap_dio_rw+0x16/0x80
=========================================================
A simple reproducer demonstrating the problem:
mkfs.ext4 -F /dev/sda -b 4096 100M
mount /dev/sda /tmp/test
fallocate -l1M /tmp/test/tmp
fallocate -l10M /tmp/test/file
fallocate -i -o 1M -l16777203M /tmp/test/file
fsstress -d /tmp/test -l 0 -n 100000 -p 8 &
sleep 10 && killall -9 fsstress
rm -f /tmp/test/tmp
xfs_io -c "open -ad /tmp/test/file" -c "pwrite -S 0xff 0 8192"
We simply refactor the logic for adjusting the best extent by adding
a temporary ext4_free_extent ex and use extent_logical_end() to avoid
overflow, which also simplifies the code.
Cc: stable@xxxxxxxxxx # 6.4
Fixes: 93cdf49f6eca ("ext4: Fix best extent lstart adjustment logic in ext4_mb_new_inode_pa()")
Signed-off-by: Baokun Li <libaokun1@xxxxxxxxxx>
Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@xxxxxxxxx>
Link: https://lore.kernel.org/r/20230724121059.11834-3-libaokun1@xxxxxxxxxx
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
Signed-off-by: Baokun Li <libaokun1@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/ext4/mballoc.c | 31 ++++++++++++++-----------------
1 file changed, 14 insertions(+), 17 deletions(-)
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -4664,8 +4664,11 @@ ext4_mb_new_inode_pa(struct ext4_allocat
pa = ac->ac_pa;
if (ac->ac_b_ex.fe_len < ac->ac_g_ex.fe_len) {
- int new_bex_start;
- int new_bex_end;
+ struct ext4_free_extent ex = {
+ .fe_logical = ac->ac_g_ex.fe_logical,
+ .fe_len = ac->ac_g_ex.fe_len,
+ };
+ loff_t orig_goal_end = extent_logical_end(sbi, &ex);
/* we can't allocate as much as normalizer wants.
* so, found space must get proper lstart
@@ -4684,29 +4687,23 @@ ext4_mb_new_inode_pa(struct ext4_allocat
* still cover original start
* 3. Else, keep the best ex at start of original request.
*/
- new_bex_end = ac->ac_g_ex.fe_logical +
- EXT4_C2B(sbi, ac->ac_g_ex.fe_len);
- new_bex_start = new_bex_end - EXT4_C2B(sbi, ac->ac_b_ex.fe_len);
- if (ac->ac_o_ex.fe_logical >= new_bex_start)
- goto adjust_bex;
+ ex.fe_len = ac->ac_b_ex.fe_len;
- new_bex_start = ac->ac_g_ex.fe_logical;
- new_bex_end =
- new_bex_start + EXT4_C2B(sbi, ac->ac_b_ex.fe_len);
- if (ac->ac_o_ex.fe_logical < new_bex_end)
+ ex.fe_logical = orig_goal_end - EXT4_C2B(sbi, ex.fe_len);
+ if (ac->ac_o_ex.fe_logical >= ex.fe_logical)
goto adjust_bex;
- new_bex_start = ac->ac_o_ex.fe_logical;
- new_bex_end =
- new_bex_start + EXT4_C2B(sbi, ac->ac_b_ex.fe_len);
+ ex.fe_logical = ac->ac_g_ex.fe_logical;
+ if (ac->ac_o_ex.fe_logical < extent_logical_end(sbi, &ex))
+ goto adjust_bex;
+ ex.fe_logical = ac->ac_o_ex.fe_logical;
adjust_bex:
- ac->ac_b_ex.fe_logical = new_bex_start;
+ ac->ac_b_ex.fe_logical = ex.fe_logical;
BUG_ON(ac->ac_o_ex.fe_logical < ac->ac_b_ex.fe_logical);
BUG_ON(ac->ac_o_ex.fe_len > ac->ac_b_ex.fe_len);
- BUG_ON(new_bex_end > (ac->ac_g_ex.fe_logical +
- EXT4_C2B(sbi, ac->ac_g_ex.fe_len)));
+ BUG_ON(extent_logical_end(sbi, &ex) > orig_goal_end);
}
/* preallocation can change ac_b_ex, thus we store actually
Patches currently in stable-queue which might be from stable-owner@xxxxxxxxxxxxxxx are
queue-5.15/ext4-avoid-overlapping-preallocations-due-to-overflow.patch
queue-5.15/ext4-fix-bug-in-ext4_mb_new_inode_pa-due-to-overflow.patch
queue-5.15/ext4-add-two-helper-functions-extent_logical_end-and-pa_logical_end.patch
