linux-hardening - Re: [PATCH] select: Avoid wrap-around instrumentation in do_sys

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Message-ID: <20240130-galant-messlatte-0a81f7a91b11@brauner>
Date: Tue, 30 Jan 2024 10:49:10 +0100
From: Christian Brauner <brauner@...nel.org>
To: Kees Cook <keescook@...omium.org>
Cc: Christian Brauner <brauner@...nel.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Jan Kara <jack@...e.cz>,
	linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: Re: [PATCH] select: Avoid wrap-around instrumentation in do_sys_poll()

On Mon, 29 Jan 2024 10:40:15 -0800, Kees Cook wrote:
> The mix of int, unsigned int, and unsigned long used by struct
> poll_list::len, todo, len, and j meant that the signed overflow
> sanitizer got worried it needed to instrument several places where
> arithmetic happens between these variables. Since all of the variables
> are always positive and bounded by unsigned int, use a single type in
> all places. Additionally expand the zero-test into an explicit range
> check before updating "todo".
> 
> [...]

Applied to the vfs.misc branch of the vfs/vfs.git tree.
Patches in the vfs.misc branch should appear in linux-next soon.

Please report any outstanding bugs that were missed during review in a
new review to the original patch series allowing us to drop it.

It's encouraged to provide Acked-bys and Reviewed-bys even though the
patch has now been applied. If possible patch trailers will be updated.

Note that commit hashes shown below are subject to change due to rebase,
trailer updates or similar. If in doubt, please check the listed branch.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git
branch: vfs.misc

[1/1] select: Avoid wrap-around instrumentation in do_sys_poll()
      https://git.kernel.org/vfs/vfs/c/ecd1f34f1242