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From: Jeongjun Park <aha310510@gmail.com>
To: willy@infradead.org
Cc: brauner@kernel.org, jfs-discussion@lists.sourceforge.net,
	jlayton@kernel.org, linux-fsdevel@vger.kernel.org,
	linux-kernel@vger.kernel.org, shaggy@kernel.org,
	syzbot+241c815bda521982cb49@syzkaller.appspotmail.com,
	syzkaller-bugs@googlegroups.com
Subject: Re: [PATCH] jfs: Fix array-index-out-of-bounds in diFree
Date: Fri, 26 Apr 2024 10:42:41 +0900	[thread overview]
Message-ID: <20240426014241.51894-1-aha310510@gmail.com> (raw)
In-Reply-To: <ZiqNMLWFIvf43Mr-@casper.infradead.org>

Matthew Wilcox wrote:
> In your earlier mail, you said the large value was found in db_agl2size.
> If the problem is in agstart then diRead() is the right place to check it.

Oh, I was so distracted last time that I wrote the explanation
incorrectly. I'm sorry.

To explain it accurately, if you pass a very large value to agstart
and set the value passed to db_agl2size to be small, it can be
manipulated so that a value greater than MAXAG is output when the
"agstart >> db_agl2size" operation is performed.
This results in an out-of-bounds vulnerability.

And the final patch before is the one that fixes diRead().

Thanks.

  reply	other threads:[~2024-04-26  1:42 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-04-23 22:25 [syzbot] [jfs?] UBSAN: " syzbot
2024-04-24  4:11 ` Jeongjun Park
2024-04-24  4:39   ` syzbot
2024-04-24 17:22 ` [PATCH] jfs: Fix " Jeongjun Park
2024-04-24 17:41   ` Matthew Wilcox
2024-04-25 12:44     ` Jeongjun Park
2024-04-25 12:53       ` Matthew Wilcox
2024-04-25 14:10         ` Jeongjun Park
2024-04-25 14:14           ` Dave Kleikamp
2024-04-25 14:17           ` Matthew Wilcox
2024-04-25 14:24             ` Jeongjun Park
2024-04-25 17:04               ` Matthew Wilcox
2024-04-26  1:42                 ` Jeongjun Park [this message]
2024-04-26  2:34                 ` Jeongjun Park
2024-04-26  3:27                   ` Matthew Wilcox
2024-04-26  3:41                     ` Jeongjun Park
2024-05-30 13:28                       ` Jeongjun Park
2024-06-26 17:40                         ` Dave Kleikamp
2024-04-25 14:24             ` Dave Kleikamp
2024-04-25 14:37             ` Jeongjun Park
2024-04-25  3:15 ` [syzbot] [jfs?] UBSAN: " Jeongjun Park
2024-04-25  4:33   ` syzbot
2024-04-25  4:59 ` Jeongjun Park
2024-04-25  5:50   ` syzbot
2024-04-25  8:56 ` Jeongjun Park
2024-04-25  9:23   ` syzbot
2024-04-25  9:04 ` Jeongjun Park
2024-04-25  9:39   ` syzbot

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