From: Chao Yu <chao@xxxxxxxxxx>
commit d8189834d4348ae608083e1f1f53792cfcc2a9bc upstream.
butt3rflyh4ck reports a bug as below:
When a thread always calls F2FS_IOC_RESIZE_FS to resize fs, if resize fs is
failed, f2fs kernel thread would invoke callback function to update f2fs io
info, it would call f2fs_write_end_io and may trigger null-ptr-deref in
NODE_MAPPING.
general protection fault, probably for non-canonical address
KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]
RIP: 0010:NODE_MAPPING fs/f2fs/f2fs.h:1972 [inline]
RIP: 0010:f2fs_write_end_io+0x727/0x1050 fs/f2fs/data.c:370
<TASK>
bio_endio+0x5af/0x6c0 block/bio.c:1608
req_bio_endio block/blk-mq.c:761 [inline]
blk_update_request+0x5cc/0x1690 block/blk-mq.c:906
blk_mq_end_request+0x59/0x4c0 block/blk-mq.c:1023
lo_complete_rq+0x1c6/0x280 drivers/block/loop.c:370
blk_complete_reqs+0xad/0xe0 block/blk-mq.c:1101
__do_softirq+0x1d4/0x8ef kernel/softirq.c:571
run_ksoftirqd kernel/softirq.c:939 [inline]
run_ksoftirqd+0x31/0x60 kernel/softirq.c:931
smpboot_thread_fn+0x659/0x9e0 kernel/smpboot.c:164
kthread+0x33e/0x440 kernel/kthread.c:379
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
The root cause is below race case can cause leaving dirty metadata
in f2fs after filesystem is remount as ro:
Thread A Thread B
- f2fs_ioc_resize_fs
- f2fs_readonly --- return false
- f2fs_resize_fs
- f2fs_remount
- write_checkpoint
- set f2fs as ro
- free_segment_range
- update meta_inode's data
Then, if f2fs_put_super() fails to write_checkpoint due to readonly
status, and meta_inode's dirty data will be writebacked after node_inode
is put, finally, f2fs_write_end_io will access NULL pointer on
sbi->node_inode.
Thread A IRQ context
- f2fs_put_super
- write_checkpoint fails
- iput(node_inode)
- node_inode = NULL
- iput(meta_inode)
- write_inode_now
- f2fs_write_meta_page
- f2fs_write_end_io
- NODE_MAPPING(sbi)
: access NULL pointer on node_inode
Fixes: b4b10061ef98 ("f2fs: refactor resize_fs to avoid meta updates in progress")
Reported-by: butt3rflyh4ck <butterflyhuangxx@xxxxxxxxx>
Closes: https://lore.kernel.org/r/1684480657-2375-1-git-send-email-yangtiezhu@xxxxxxxxxxx
Tested-by: butt3rflyh4ck <butterflyhuangxx@xxxxxxxxx>
Signed-off-by: Chao Yu <chao@xxxxxxxxxx>
Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
Signed-off-by: Stefan Ghinea <stefan.ghinea@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/f2fs/f2fs.h | 2 +-
fs/f2fs/file.c | 2 +-
fs/f2fs/gc.c | 22 +++++++++++++++++++---
3 files changed, 21 insertions(+), 5 deletions(-)
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -3483,7 +3483,7 @@ block_t f2fs_start_bidx_of_node(unsigned
int f2fs_gc(struct f2fs_sb_info *sbi, bool sync, bool background, bool force,
unsigned int segno);
void f2fs_build_gc_manager(struct f2fs_sb_info *sbi);
-int f2fs_resize_fs(struct f2fs_sb_info *sbi, __u64 block_count);
+int f2fs_resize_fs(struct file *filp, __u64 block_count);
int __init f2fs_create_garbage_collection_cache(void);
void f2fs_destroy_garbage_collection_cache(void);
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -3356,7 +3356,7 @@ static int f2fs_ioc_resize_fs(struct fil
sizeof(block_count)))
return -EFAULT;
- return f2fs_resize_fs(sbi, block_count);
+ return f2fs_resize_fs(filp, block_count);
}
static int f2fs_ioc_enable_verity(struct file *filp, unsigned long arg)
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -7,6 +7,7 @@
*/
#include <linux/fs.h>
#include <linux/module.h>
+#include <linux/mount.h>
#include <linux/backing-dev.h>
#include <linux/init.h>
#include <linux/f2fs_fs.h>
@@ -1976,8 +1977,9 @@ static void update_fs_metadata(struct f2
}
}
-int f2fs_resize_fs(struct f2fs_sb_info *sbi, __u64 block_count)
+int f2fs_resize_fs(struct file *filp, __u64 block_count)
{
+ struct f2fs_sb_info *sbi = F2FS_I_SB(file_inode(filp));
__u64 old_block_count, shrunk_blocks;
struct cp_control cpc = { CP_RESIZE, 0, 0, 0 };
unsigned int secs;
@@ -2015,12 +2017,18 @@ int f2fs_resize_fs(struct f2fs_sb_info *
return -EINVAL;
}
+ err = mnt_want_write_file(filp);
+ if (err)
+ return err;
+
shrunk_blocks = old_block_count - block_count;
secs = div_u64(shrunk_blocks, BLKS_PER_SEC(sbi));
/* stop other GC */
- if (!down_write_trylock(&sbi->gc_lock))
- return -EAGAIN;
+ if (!down_write_trylock(&sbi->gc_lock)) {
+ err = -EAGAIN;
+ goto out_drop_write;
+ }
/* stop CP to protect MAIN_SEC in free_segment_range */
f2fs_lock_op(sbi);
@@ -2040,10 +2048,18 @@ int f2fs_resize_fs(struct f2fs_sb_info *
out_unlock:
f2fs_unlock_op(sbi);
up_write(&sbi->gc_lock);
+out_drop_write:
+ mnt_drop_write_file(filp);
if (err)
return err;
freeze_super(sbi->sb);
+
+ if (f2fs_readonly(sbi->sb)) {
+ thaw_super(sbi->sb);
+ return -EROFS;
+ }
+
down_write(&sbi->gc_lock);
mutex_lock(&sbi->cp_mutex);
