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Date: Wed, 25 Apr 2018 20:57:10 +0800
From: Chao Yu <chao@...nel.org>
To: Jaegeuk Kim <jaegeuk@...nel.org>, linux-kernel@...r.kernel.org,
linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [f2fs-dev] [PATCH 1/5] f2fs: give message and set need_fsck given
broken node id
On 2018/4/25 13:46, Jaegeuk Kim wrote:
> syzbot hit the following crash on upstream commit
> 83beed7b2b26f232d782127792dd0cd4362fdc41 (Fri Apr 20 17:56:32 2018 +0000)
> Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux-soc-thermal
> syzbot dashboard link: https://syzkaller.appspot.com/bug?extid=d154ec99402c6f628887
>
> C reproducer: https://syzkaller.appspot.com/x/repro.c?id=5414336294027264
> syzkaller reproducer: https://syzkaller.appspot.com/x/repro.syz?id=5471683234234368
> Raw console output: https://syzkaller.appspot.com/x/log.txt?id=5436660795834368
> Kernel config: https://syzkaller.appspot.com/x/.config?id=1808800213120130118
> compiler: gcc (GCC) 8.0.1 20180413 (experimental)
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+d154ec99402c6f628887@...kaller.appspotmail.com
> It will help syzbot understand when the bug is fixed. See footer for details.
> If you forward the report, please keep this part and the footer.
>
> F2FS-fs (loop0): Magic Mismatch, valid(0xf2f52010) - read(0x0)
> F2FS-fs (loop0): Can't find valid F2FS filesystem in 1th superblock
> F2FS-fs (loop0): invalid crc value
> ------------[ cut here ]------------
> kernel BUG at fs/f2fs/node.c:1185!
> invalid opcode: 0000 [#1] SMP KASAN
> Dumping ftrace buffer:
> (ftrace buffer empty)
> Modules linked in:
> CPU: 1 PID: 4549 Comm: syzkaller704305 Not tainted 4.17.0-rc1+ #10
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
> RIP: 0010:__get_node_page+0xb68/0x16e0 fs/f2fs/node.c:1185
> RSP: 0018:ffff8801d960e820 EFLAGS: 00010293
> RAX: ffff8801d88205c0 RBX: 0000000000000003 RCX: ffffffff82f6cc06
> RDX: 0000000000000000 RSI: ffffffff82f6d5e8 RDI: 0000000000000004
> RBP: ffff8801d960ec30 R08: ffff8801d88205c0 R09: ffffed003b5e46c2
> R10: 0000000000000003 R11: 0000000000000003 R12: ffff8801a86e00c0
> R13: 0000000000000001 R14: ffff8801a86e0530 R15: ffff8801d9745240
> FS: 000000000072c880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007f3d403209b8 CR3: 00000001d8f3f000 CR4: 00000000001406e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
> get_node_page fs/f2fs/node.c:1237 [inline]
> truncate_xattr_node+0x152/0x2e0 fs/f2fs/node.c:1014
> remove_inode_page+0x200/0xaf0 fs/f2fs/node.c:1039
> f2fs_evict_inode+0xe86/0x1710 fs/f2fs/inode.c:547
> evict+0x4a6/0x960 fs/inode.c:557
> iput_final fs/inode.c:1519 [inline]
> iput+0x62d/0xa80 fs/inode.c:1545
> f2fs_fill_super+0x5f4e/0x7bf0 fs/f2fs/super.c:2849
> mount_bdev+0x30c/0x3e0 fs/super.c:1164
> f2fs_mount+0x34/0x40 fs/f2fs/super.c:3020
> mount_fs+0xae/0x328 fs/super.c:1267
> vfs_kern_mount.part.34+0xd4/0x4d0 fs/namespace.c:1037
> vfs_kern_mount fs/namespace.c:1027 [inline]
> do_new_mount fs/namespace.c:2518 [inline]
> do_mount+0x564/0x3070 fs/namespace.c:2848
> ksys_mount+0x12d/0x140 fs/namespace.c:3064
> __do_sys_mount fs/namespace.c:3078 [inline]
> __se_sys_mount fs/namespace.c:3075 [inline]
> __x64_sys_mount+0xbe/0x150 fs/namespace.c:3075
> do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
> entry_SYSCALL_64_after_hwframe+0x49/0xbe
> RIP: 0033:0x443dea
> RSP: 002b:00007ffcc7882368 EFLAGS: 00000297 ORIG_RAX: 00000000000000a5
> RAX: ffffffffffffffda RBX: 0000000020000c00 RCX: 0000000000443dea
> RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffcc7882370
> RBP: 0000000000000003 R08: 0000000020016a00 R09: 000000000000000a
> R10: 0000000000000000 R11: 0000000000000297 R12: 0000000000000004
> R13: 0000000000402ce0 R14: 0000000000000000 R15: 0000000000000000
> RIP: __get_node_page+0xb68/0x16e0 fs/f2fs/node.c:1185 RSP: ffff8801d960e820
> ---[ end trace 4edbeb71f002bb76 ]---
>
> Reported-and-tested-by: syzbot+d154ec99402c6f628887@...kaller.appspotmail.com
> Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
> ---
> fs/f2fs/f2fs.h | 13 +------------
> fs/f2fs/inode.c | 13 ++++++-------
> fs/f2fs/node.c | 23 +++++++++++++++++++++--
> 3 files changed, 28 insertions(+), 21 deletions(-)
>
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index 8f3ad9662d13..d26aae5bf00d 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -1583,18 +1583,6 @@ static inline bool __exist_node_summaries(struct f2fs_sb_info *sbi)
> is_set_ckpt_flags(sbi, CP_FASTBOOT_FLAG));
> }
>
> -/*
> - * Check whether the given nid is within node id range.
> - */
> -static inline int check_nid_range(struct f2fs_sb_info *sbi, nid_t nid)
> -{
> - if (unlikely(nid < F2FS_ROOT_INO(sbi)))
> - return -EINVAL;
> - if (unlikely(nid >= NM_I(sbi)->max_nid))
> - return -EINVAL;
> - return 0;
> -}
> -
> /*
> * Check whether the inode has blocks or not
> */
> @@ -2768,6 +2756,7 @@ f2fs_hash_t f2fs_dentry_hash(const struct qstr *name_info,
> struct dnode_of_data;
> struct node_info;
>
> +int check_nid_range(struct f2fs_sb_info *sbi, nid_t nid);
> bool available_free_memory(struct f2fs_sb_info *sbi, int type);
> int need_dentry_mark(struct f2fs_sb_info *sbi, nid_t nid);
> bool is_checkpointed_node(struct f2fs_sb_info *sbi, nid_t nid);
> diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
> index 176f8e84bb6e..414b1ede642b 100644
> --- a/fs/f2fs/inode.c
> +++ b/fs/f2fs/inode.c
> @@ -194,12 +194,8 @@ static int do_read_inode(struct inode *inode)
> projid_t i_projid;
>
> /* Check if ino is within scope */
> - if (check_nid_range(sbi, inode->i_ino)) {
> - f2fs_msg(inode->i_sb, KERN_ERR, "bad inode number: %lu",
> - (unsigned long) inode->i_ino);
> - WARN_ON(1);
> + if (check_nid_range(sbi, inode->i_ino))
> return -EINVAL;
> - }
>
> node_page = get_node_page(sbi, inode->i_ino);
> if (IS_ERR(node_page))
> @@ -588,8 +584,11 @@ void f2fs_evict_inode(struct inode *inode)
> alloc_nid_failed(sbi, inode->i_ino);
> clear_inode_flag(inode, FI_FREE_NID);
> } else {
> - f2fs_bug_on(sbi, err &&
> - !exist_written_data(sbi, inode->i_ino, ORPHAN_INO));
> + /*
> + * If xattr nid is corrupted, we can reach out error condition,
> + * err & !exist_written_data(sbi, inode->i_ino, ORPHAN_INO)).
> + * In that case, check_nid_range() is enough to give a clue.
> + */
> }
> out_clear:
> fscrypt_put_encryption_info(inode);
> diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
> index 3a3d38b3e9ec..2dd34cd980b1 100644
> --- a/fs/f2fs/node.c
> +++ b/fs/f2fs/node.c
> @@ -29,6 +29,21 @@ static struct kmem_cache *nat_entry_slab;
> static struct kmem_cache *free_nid_slab;
> static struct kmem_cache *nat_entry_set_slab;
>
> +/*
> + * Check whether the given nid is within node id range.
> + */
> +int check_nid_range(struct f2fs_sb_info *sbi, nid_t nid)
> +{
> + if (unlikely(nid < F2FS_ROOT_INO(sbi) || nid >= NM_I(sbi)->max_nid)) {
> + set_sbi_flag(sbi, SBI_NEED_FSCK);
> + f2fs_msg(sbi->sb, KERN_WARNING,
> + "%s: out-of-range nid=%x, run fsck to fix.",
> + __func__, nid);
> + return -EINVAL;
> + }
> + return 0;
> +}
> +
> bool available_free_memory(struct f2fs_sb_info *sbi, int type)
> {
> struct f2fs_nm_info *nm_i = NM_I(sbi);
> @@ -1010,6 +1025,8 @@ int truncate_xattr_node(struct inode *inode)
>
> if (!nid)
> return 0;
> + if (check_nid_range(sbi, nid))
> + return -EINVAL;
Below get_node_page() will call check_nid_range(), so above check is redundant.
Thanks,
>
> npage = get_node_page(sbi, nid);
> if (IS_ERR(npage))
> @@ -1158,7 +1175,8 @@ void ra_node_page(struct f2fs_sb_info *sbi, nid_t nid)
>
> if (!nid)
> return;
> - f2fs_bug_on(sbi, check_nid_range(sbi, nid));
> + if (check_nid_range(sbi, nid))
> + return;
>
> rcu_read_lock();
> apage = radix_tree_lookup(&NODE_MAPPING(sbi)->i_pages, nid);
> @@ -1182,7 +1200,8 @@ static struct page *__get_node_page(struct f2fs_sb_info *sbi, pgoff_t nid,
>
> if (!nid)
> return ERR_PTR(-ENOENT);
> - f2fs_bug_on(sbi, check_nid_range(sbi, nid));
> + if (check_nid_range(sbi, nid))
> + return ERR_PTR(-EINVAL);
> repeat:
> page = f2fs_grab_cache_page(NODE_MAPPING(sbi), nid, false);
> if (!page)
>
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