Re: [PATCH v2] ext4: fix kernel infoleak via ext4_extent_header

[PATCH v2] ext4: fix kernel infoleak via ext4_extent_header · Anirudh Rayabharam <hidden> · 2021-05-06
Re: [PATCH v2] ext4: fix kernel infoleak via ext4_extent_header · "Theodore Ts'o" <tytso@mit.edu> · 2021-06-16
How can this fix prevent information from leaking to user space and prevent the kernel from crashing? · Lizhi Xu <hidden> · 2022-12-26
Re: How can this fix prevent information from leaking to user space and prevent the kernel from crashing? · Eric Biggers <ebiggers@kernel.org> · 2022-12-29

From: "Theodore Ts'o" <tytso@mit.edu>
Date: 2021-06-16 23:45:58
Also in: linux-kernel-mentees, lkml

On Fri, May 07, 2021 at 12:26:54AM +0530, Anirudh Rayabharam wrote:

Initialize eh_generation of struct ext4_extent_header to prevent leaking
info to userspace. Fixes KMSAN kernel-infoleak bug reported by syzbot at:
http://syzkaller.appspot.com/bug?id=78e9ad0e6952a3ca16e8234724b2fa92d041b9b8

Reported-by: syzbot+2dcfeaf8cb49b05e8f1a@syzkaller.appspotmail.com
Fixes: a86c61812637 ("[PATCH] ext3: add extent map support")
Signed-off-by: Anirudh Rayabharam <redacted>

Applied, thanks.

					- Ted

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