linux-kernel - Re: [PATCH v2] Fix WARNING in __ext4

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Message-ID: <20240711024207.GC10452@mit.edu>
Date: Wed, 10 Jul 2024 22:42:07 -0400
From: "Theodore Ts'o" <tytso@....edu>
To: Pei Li <peili.dev@...il.com>
Cc: Andreas Dilger <adilger.kernel@...ger.ca>, linux-ext4@...r.kernel.org,
        linux-kernel@...r.kernel.org, skhan@...uxfoundation.org,
        syzkaller-bugs@...glegroups.com,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        syzbot+2cab87506a0e7885f4b9@...kaller.appspotmail.com
Subject: Re: [PATCH v2] Fix WARNING in __ext4_ioctl

Thanks for the patch; however, the correct fix submitted by Kees with
this commit:

commit be27cd64461c45a6088a91a04eba5cd44e1767ef
Author: Kees Cook <kees@...nel.org>
Date:   Thu May 23 15:54:12 2024 -0700

    ext4: use memtostr_pad() for s_volume_name
    
    As with the other strings in struct ext4_super_block, s_volume_name is
    not NUL terminated. The other strings were marked in commit 072ebb3bffe6
    ("ext4: add nonstring annotations to ext4.h"). Using strscpy() isn't
    the right replacement for strncpy(); it should use memtostr_pad()
    instead.
    
    Reported-by: syzbot+50835f73143cc2905b9e@...kaller.appspotmail.com
    Closes: https://lore.kernel.org/all/00000000000019f4c00619192c05@google.com/
    Fixes: 744a56389f73 ("ext4: replace deprecated strncpy with alternatives")
    Signed-off-by: Kees Cook <keescook@...omium.org>
    Link: https://patch.msgid.link/20240523225408.work.904-kees@kernel.org
    Signed-off-by: Theodore Ts'o <tytso@....edu>

						- Ted