From: Gao Xiang <xiang@kernel.org>
To: Utkal Singh <singhutkal015@gmail.com>
Cc: linux-erofs@lists.ozlabs.org, xiang@kernel.org,
yifan.yfzhao@linux.dev, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3] erofs: validate h_shared_count in erofs_init_inode_xattrs()
Date: Wed, 18 Mar 2026 00:48:52 +0800 [thread overview]
Message-ID: <abmF9Nn85cz35C1k@debian> (raw)
In-Reply-To: <20260317164135.24892-1-singhutkal015@gmail.com>
On Tue, Mar 17, 2026 at 04:41:35PM +0000, Utkal Singh wrote:
> A crafted image can set h_shared_count to a value much larger than
> what xattr_isize allows. The loop in erofs_init_inode_xattrs() then
> reads shared xattr IDs far beyond the inode's xattr region, causing
> an out-of-bounds metadata read.
>
> Add a sanity check ensuring:
>
> h_shared_count <= (xattr_isize - sizeof(erofs_xattr_ibody_header)) / 4
>
> Return -EFSCORRUPTED when the check fails.
>
> Signed-off-by: Utkal Singh <singhutkal015@gmail.com>
What happens with your v3?
What happens with the commit message and the division?
Could you explain what happened?
Thanks,
Gao Xiang
next prev parent reply other threads:[~2026-03-17 16:49 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-17 15:24 [PATCH v2] erofs: harden h_shared_count in erofs_init_inode_xattrs() Utkal Singh
2026-03-17 16:10 ` Gao Xiang
2026-03-17 16:41 ` [PATCH v3] erofs: validate " Utkal Singh
2026-03-17 16:48 ` Gao Xiang [this message]
2026-03-17 16:53 ` Gao Xiang
2026-03-17 16:59 ` Utkal Singh
2026-03-17 17:07 ` Gao Xiang
2026-03-18 6:08 ` [PATCH v2] erofs: harden " Chao Yu
2026-03-18 7:39 ` Utkal Singh
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