linux-kernel - Re: Unused local variable load_addr in load_elf

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Mon, 6 Dec 2021 18:04:56 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Lukas Bulwahn <lukas.bulwahn@...il.com>
Cc:     Akira Kawata <akirakawata1@...il.com>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Eric Biederman <ebiederm@...ssion.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        kernel-janitors <kernel-janitors@...r.kernel.org>
Subject: Re: Unused local variable load_addr in load_elf_binary()

On Mon, Dec 06, 2021 at 04:46:01PM +0100, Lukas Bulwahn wrote:
> Dear Akira-san,
> 
> With commit 0c9333606e30 ("fs/binfmt_elf: Fix AT_PHDR for unusual ELF
> files"), you have changed load_elf_binary() in ./fs/binfmt_elf.c in a
> way such that the local variable load_addr in load_elf_binary() is not
> used anymore.

EEk! yeah, this totally broke ELF randomization. this needs to be
entirely reverted.

-- 
Kees Cook