linux-kernel - Re: [PATCH v3 5/5] exec: Add a exec_update_mutex to replace cred_guard

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Message-ID: <AM6PR03MB5170F50FD049FA7B365924F7E4F40@AM6PR03MB5170.eurprd03.prod.outlook.com>
Date:   Thu, 19 Mar 2020 08:19:22 +0100
From:   Bernd Edlinger <bernd.edlinger@...mail.de>
To:     Kirill Tkhai <ktkhai@...tuozzo.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     Christian Brauner <christian.brauner@...ntu.com>,
        Kees Cook <keescook@...omium.org>,
        Jann Horn <jannh@...gle.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>,
        James Morris <jamorris@...ux.microsoft.com>,
        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-api@...r.kernel.org" <linux-api@...r.kernel.org>
Subject: Re: [PATCH v3 5/5] exec: Add a exec_update_mutex to replace
 cred_guard_mutex



On 3/19/20 8:13 AM, Kirill Tkhai wrote:
> On 18.03.2020 23:06, Bernd Edlinger wrote:
>>
>> I was thinking of something like that:
>>
>> --- a/fs/exec.c
>> +++ b/fs/exec.c
>> @@ -1010,6 +1010,11 @@ ssize_t read_code(struct file *file, unsigned long addr, 
>>  }
>>  EXPORT_SYMBOL(read_code);
>>  
>> +/*
>> + * Maps the mm_struct mm into the current task struct.
>> + * On success, this function returns with the mutex
>> + * exec_update_mutex locked.
>> + */
> 
> Looks OK for me.
> 

Cool, yeah, then I will post an updated patch in a moment.


Thanks
Bernd.