linux-kernel - Re: [PATCH] f2fs: add sanity check for quota sysfile ino

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Message-ID: <20180131034914.GA93573@jaegeuk-macbookpro.roam.corp.google.com>
Date:   Tue, 30 Jan 2018 19:49:14 -0800
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     Chao Yu <yuchao0@...wei.com>
Cc:     linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org, chao@...nel.org
Subject: Re: [PATCH] f2fs: add sanity check for quota sysfile ino

On 01/31, Chao Yu wrote:
> On 2018/1/31 10:36, Jaegeuk Kim wrote:
> > On 01/31, Chao Yu wrote:
> >> On 2018/1/31 9:35, Jaegeuk Kim wrote:
> >>> On 01/29, Chao Yu wrote:
> >>>> Add missing sanity check for quota sysfile ino.
> >>>
> >>> We don't need to limit the specific inode numbers for quota files, since
> >>> we may be able to set any inode numbers later. How about checkint the
> >>> numbers are allocated as quota?
> > 
> > If quota_ino is set, f2fs_enable_quotas() will be failed, if its ino is invalid.
> > It'd be also fine, if we have no inode numbers there. What I mean was we may need
> > to consider reallocating or deallocating inode numbers later.
> 
> Oh, so that it will be better to do more check & repair in fsck tools, right?

What is the rule that you're considering? We're already checking quota inodes
in fsck.f2fs.

> 
> Thanks,
> 
> > 
> >>
> >> Do you mean:
> >>
> >> 	if (raw_super->feature & cpu_to_le32(F2FS_FEATURE_QUOTA_INO)) {
> >> 		if (!le32_to_cpu(raw_super->qf_ino[0]) ||
> >> 			!le32_to_cpu(raw_super->qf_ino[1])) {
> >> 			f2fs_msg(sb, KERN_INFO,
> >> 				"Invalid Quota Ino: user_ino(%u), grp_ino(%u)",
> >> 				le32_to_cpu(raw_super->qf_ino[0]),
> >> 				le32_to_cpu(raw_super->qf_ino[1]));
> >> 			return 1;
> >> 		}
> >> 		if (raw_super->feature & cpu_to_le32(F2FS_FEATURE_PRJQUOTA) &&
> >> 			!le32_to_cpu(raw_super->qf_ino[2])) {
> >> 			f2fs_msg(sb, KERN_INFO,
> >> 				"Invalid Quota Ino: prj_ino(%u)",
> >> 				le32_to_cpu(raw_super->qf_ino[2]));
> >> 			return 1;
> >> 		}
> >> 	}
> >>
> >> I think it's equal to:
> >>
> >> 	if (raw_super->feature & cpu_to_le32(F2FS_FEATURE_QUOTA_INO)) {
> >> 		unsigned int qf_cnt = 0;
> >> 		if (qf_ino[0])
> >> 			qf_cnt++;
> >> 		if (qf_ino[1])
> >> 			qf_cnt++;
> >> 		if (qf_cnt != 2) {
> >> 			f2fs_msg();
> >> 			return 1;
> >> 		}
> >> 		if (raw_super->feature & cpu_to_le32(F2FS_FEATURE_PRJQUOTA)) {
> >> 			if (qf_ino[2])
> >> 				qf_cnt++;
> >> 			if (qf_cnt != 3) {
> >> 				f2fs_msg();
> >> 				return 1;
> >> 			}
> >> 		}
> >> 	}
> >>
> >> Thanks,
> >>
> >>>
> >>>>
> >>>> Signed-off-by: Chao Yu <yuchao0@...wei.com>
> >>>> ---
> >>>>  fs/f2fs/super.c | 19 +++++++++++++++++++
> >>>>  1 file changed, 19 insertions(+)
> >>>>
> >>>> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> >>>> index 368f63d7bad2..6011071688ca 100644
> >>>> --- a/fs/f2fs/super.c
> >>>> +++ b/fs/f2fs/super.c
> >>>> @@ -2116,6 +2116,25 @@ static int sanity_check_raw_super(struct f2fs_sb_info *sbi,
> >>>>  		return 1;
> >>>>  	}
> >>>>  
> >>>> +	/* check quota sysfile ino info */
> >>>> +	if (raw_super->feature & cpu_to_le32(F2FS_FEATURE_QUOTA_INO)) {
> >>>> +		if (le32_to_cpu(raw_super->qf_ino[0]) != 4 ||
> >>>> +			le32_to_cpu(raw_super->qf_ino[1]) != 5) {
> >>>> +			f2fs_msg(sb, KERN_INFO,
> >>>> +				"Invalid Quota Ino: user_ino(%u), grp_ino(%u)",
> >>>> +				le32_to_cpu(raw_super->qf_ino[0]),
> >>>> +				le32_to_cpu(raw_super->qf_ino[1]));
> >>>> +			return 1;
> >>>> +		}
> >>>> +		if (raw_super->feature & cpu_to_le32(F2FS_FEATURE_PRJQUOTA) &&
> >>>> +			le32_to_cpu(raw_super->qf_ino[2]) != 6) {
> >>>> +			f2fs_msg(sb, KERN_INFO,
> >>>> +				"Invalid Quota Ino: prj_ino(%u)",
> >>>> +				le32_to_cpu(raw_super->qf_ino[2]));
> >>>> +			return 1;
> >>>> +		}
> >>>> +	}
> >>>> +
> >>>>  	if (le32_to_cpu(raw_super->segment_count) > F2FS_MAX_SEGMENT) {
> >>>>  		f2fs_msg(sb, KERN_INFO,
> >>>>  			"Invalid segment count (%u)",
> >>>> -- 
> >>>> 2.15.0.55.gc2ece9dc4de6
> >>>
> >>> .
> >>>
> > 
> > .
> >