linux-kernel - Re: [PATCHv3] exec: Fix a deadlock in ptrace

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Message-ID: <AM6PR03MB51709CFCC54A25681C87DABAE4E70@AM6PR03MB5170.eurprd03.prod.outlook.com>
Date:   Mon, 2 Mar 2020 20:28:56 +0000
From:   Bernd Edlinger <bernd.edlinger@...mail.de>
To:     Jann Horn <jannh@...gle.com>,
        Christian Brauner <christian@...uner.io>
CC:     "Eric W. Biederman" <ebiederm@...ssion.com>,
        James Morris <jamorris@...ux.microsoft.com>,
        Jonathan Corbet <corbet@....net>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Oleg Nesterov <oleg@...hat.com>,
        Frederic Weisbecker <frederic@...nel.org>,
        Andrei Vagin <avagin@...il.com>,
        Ingo Molnar <mingo@...nel.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Yuyang Du <duyuyang@...il.com>,
        David Hildenbrand <david@...hat.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Anshuman Khandual <anshuman.khandual@....com>,
        David Howells <dhowells@...hat.com>,
        Kees Cook <keescook@...omium.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Shakeel Butt <shakeelb@...gle.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Christian Kellner <christian@...lner.me>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Aleksa Sarai <cyphar@...har.com>,
        "Dmitry V. Levin" <ldv@...linux.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        linux-security-module <linux-security-module@...r.kernel.org>
Subject: Re: [PATCHv3] exec: Fix a deadlock in ptrace

On 3/2/20 9:10 PM, Bernd Edlinger wrote:
> --- a/include/linux/binfmts.h
> +++ b/include/linux/binfmts.h
> @@ -44,7 +44,11 @@ struct linux_binprm {
>  		 * exec has happened. Used to sanitize execution environment
>  		 * and to set AT_SECURE auxv for glibc.
>  		 */
> -		secureexec:1;
> +		secureexec:1,
> +		/*
> +		 * Set by flush_old_exec, when the cred_change_mutex is taken.

Oops, missed to update this comment, should be "when the cred_guard_mutex is taken".

I'll send a new patch later.

Bernd.

> +		 */
> +		called_flush_old_exec:1;
>  #ifdef __alpha__
>  	unsigned int taso:1;
>  #endif