linux-kernel - Re: [PATCH 1/2] proc: fix to check name length in proc_lookup

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Message-ID: <f61aea20-8bbc-8775-3026-6eec459eda3d@kernel.org>
Date:   Sat, 11 Feb 2023 09:13:23 +0800
From:   Chao Yu <chao@...nel.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     viro@...iv.linux.org.uk, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, adobriyan@...il.com
Subject: Re: [PATCH 1/2] proc: fix to check name length in proc_lookup_de()

On 2023/2/3 7:41, Andrew Morton wrote:
> [patch 1/2]: Alexey wasn't keen on the v1 patch.  What changed?

I replied to Alexey's comments on v1, but still didn't get any
feedback, so I just rebase the code to last -next. Sorry, too rush
to missed to add change log on v2.

> 
> [patch 2/2]: What is the benefit from this change?

Block size is mismatch in between results of stat() and statfs(),
this patch tries to fix this issue.

stat  /proc/
    File: /proc/
    Size: 0         	Blocks: 0          IO Block: 1024   directory
Device: 14h/20d	Inode: 1           Links: 310
Access: (0555/dr-xr-xr-x)  Uid: (    0/    root)   Gid: (    0/    root)
Access: 2023-01-28 23:14:20.491937242 +0800
Modify: 2023-01-28 23:14:20.491937242 +0800
Change: 2023-01-28 23:14:20.491937242 +0800
   Birth: -

stat -f  /proc/
    File: "/proc/"
      ID: 0        Namelen: 255     Type: proc
Block size: 4096       Fundamental block size: 4096
Blocks: Total: 0          Free: 0          Available: 0
Inodes: Total: 0          Free: 0