linux-kernel - Re: [PATCH 0/5] exec: binfmt_misc: fix use-after-free, kill iname[BINPRM_BUF

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Date:   Fri, 22 Sep 2017 08:24:05 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Oleg Nesterov <oleg@...hat.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Ben Woodard <woodard@...hat.com>,
        James Bottomley <James.Bottomley@...senpartnership.com>,
        Jim Foraker <foraker1@...l.gov>,
        Travis Gummels <tgummels@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/5] exec: binfmt_misc: fix use-after-free, kill iname[BINPRM_BUF_SIZE]

On Fri, Sep 22, 2017 at 7:36 AM, Oleg Nesterov <oleg@...hat.com> wrote:
> Note: 5/5 depends on
>
>         -extern int bprm_change_interp(char *interp, struct linux_binprm *bprm);
>         +extern int bprm_change_interp(const char *interp, struct linux_binprm *bprm);
>
> change in
>
>         [PATCH] exec: load_script: kill the onstack interp[BINPRM_BUF_SIZE] array
>         https://marc.info/?l=linux-kernel&m=150575251328591
>
> I sent before.
>
> Looks like this code was always wrong, then 948b701a607f ("binfmt_misc: add persistent
> opened binary handler for containers") added more problems.
>
> Oleg.
>
>  fs/binfmt_misc.c | 56 ++++++++++++++++++++++++++------------------------------
>  1 file changed, 26 insertions(+), 30 deletions(-)

This all looks correct to me, thanks!

Acked-by: Kees Cook <keescook@...omium.org>

-Kees

-- 
Kees Cook
Pixel Security