Re: [f2fs-dev] [PATCH] f2fs: fix to do sanity check for inline inode

[Chao Yu <chao@kernel.org>]

On 2022/5/5 5:28, Jaegeuk Kim wrote:
> On 04/28, Chao Yu wrote:
>> As Yanming reported in bugzilla:
>>
>> https://bugzilla.kernel.org/show_bug.cgi?id=215895
>>
>> I have encountered a bug in F2FS file system in kernel v5.17.
>>
>> The kernel message is shown below:
>>
>> kernel BUG at fs/inode.c:611!
>> Call Trace:
>>   evict+0x282/0x4e0
>>   __dentry_kill+0x2b2/0x4d0
>>   dput+0x2dd/0x720
>>   do_renameat2+0x596/0x970
>>   __x64_sys_rename+0x78/0x90
>>   do_syscall_64+0x3b/0x90
>>
>> The root cause is: fuzzed inode has both inline_data flag and encrypted
>> flag, so after it was deleted by rename(), during f2fs_evict_inode(),
>> it will cause inline data conversion due to flags confilction, then
>> page cache will be polluted and trigger panic in clear_inode().
>>
>> This patch tries to fix the issue by do more sanity checks for inline
>> data inode in sanity_check_inode().
>>
>> Cc: stable@vger.kernel.org
>> Reported-by: Ming Yan <yanming@tju.edu.cn>
>> Signed-off-by: Chao Yu <chao.yu@oppo.com>
>> ---
>>   fs/f2fs/f2fs.h  | 7 +++++++
>>   fs/f2fs/inode.c | 3 +--
>>   2 files changed, 8 insertions(+), 2 deletions(-)
>>
>> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
>> index 27aa93caec06..64c511b498cc 100644
>> --- a/fs/f2fs/f2fs.h
>> +++ b/fs/f2fs/f2fs.h
>> @@ -4173,6 +4173,13 @@ static inline void f2fs_set_encrypted_inode(struct inode *inode)
>>    */
>>   static inline bool f2fs_post_read_required(struct inode *inode)
>>   {
>> +	/*
>> +	 * used by sanity_check_inode(), when disk layout fields has not
>> +	 * been synchronized to inmem fields.
>> +	 */
>> +	if (file_is_encrypt(inode) || file_is_verity(inode) ||
>> +			F2FS_I(inode)->i_flags & F2FS_COMPR_FL)
>> +		return true;
>>   	return f2fs_encrypted_file(inode) || fsverity_active(inode) ||
>>   		f2fs_compressed_file(inode);
>>   }
>> diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
>> index 83639238a1fe..234b8ed02644 100644
>> --- a/fs/f2fs/inode.c
>> +++ b/fs/f2fs/inode.c
>> @@ -276,8 +276,7 @@ static bool sanity_check_inode(struct inode *inode, struct page *node_page)
>>   		}
>>   	}
>>   
>> -	if (f2fs_has_inline_data(inode) &&
>> -			(!S_ISREG(inode->i_mode) && !S_ISLNK(inode->i_mode))) {
>> +	if (f2fs_has_inline_data(inode) && !f2fs_may_inline_data(inode)) {
> 
> It seems f2fs_may_inline_data() is breaking the atomic write case. Please fix.

sanity_check_inode() change only affect f2fs_iget(), during inode initialization,
file should not be set as atomic one, right?

I didn't see any failure during 'f2fs_io write atomic_write' testcase... could you
please provide me detail of the testcase?

Thanks,

> 
>>   		set_sbi_flag(sbi, SBI_NEED_FSCK);
>>   		f2fs_warn(sbi, "%s: inode (ino=%lx, mode=%u) should not have inline_data, run fsck to fix",
>>   			  __func__, inode->i_ino, inode->i_mode);
>> -- 
>> 2.25.1


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