linux-hardening - Re: [PATCH] jfs: Use unsigned variable for length calculations

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Message-Id: <20230602-unnahbar-halbmarathon-22e48883e051@brauner>
Date:   Fri,  2 Jun 2023 10:32:20 +0200
From:   Christian Brauner <brauner@...nel.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     Christian Brauner <brauner@...nel.org>,
        Dave Chinner <dchinner@...hat.com>,
        jfs-discussion@...ts.sourceforge.net,
        "Dr. David Alan Gilbert" <linux@...blig.org>,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org,
        Dave Kleikamp <shaggy@...nel.org>
Subject: Re: [PATCH] jfs: Use unsigned variable for length calculations

On Sat, 04 Feb 2023 10:33:56 -0800, Kees Cook wrote:
> To avoid confusing the compiler about possible negative sizes, switch
> "ssize" which can never be negative from int to u32.  Seen with GCC 13:
> 
> ../fs/jfs/namei.c: In function 'jfs_symlink': ../include/linux/fortify-string.h:57:33: warning: '__builtin_memcpy' pointer overflow between offset 0 and size [-2147483648, -1]
> [-Warray-bounds=]
>    57 | #define __underlying_memcpy     __builtin_memcpy
>       |                                 ^
> ...
> ../fs/jfs/namei.c:950:17: note: in expansion of macro 'memcpy'
>   950 |                 memcpy(ip->i_link, name, ssize);
>       |                 ^~~~~~
> 
> [...]

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.

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

[1/1] jfs: Use unsigned variable for length calculations
      https://git.kernel.org/vfs/vfs/c/2d6e1895d440