linux-kernel - Re: [PATCH] kernel/signal: Signal-based pre-coredump notification

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Message-ID: <5bbe7c70-d6a8-7b37-51d4-eed9a99bc7e1@cisco.com>
Date:   Mon, 15 Oct 2018 11:39:32 -0700
From:   Enke Chen <enkechen@...co.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     christian@...uner.io, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Arnd Bergmann <arnd@...db.de>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Khalid Aziz <khalid.aziz@...cle.com>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Helge Deller <deller@....de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Dave Martin <Dave.Martin@....com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Michal Hocko <mhocko@...nel.org>,
        Rik van Riel <riel@...riel.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Roman Gushchin <guro@...com>,
        Marcos Paulo de Souza <marcos.souza.org@...il.com>,
        Oleg Nesterov <oleg@...hat.com>,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        Cyrill Gorcunov <gorcunov@...nvz.org>,
        Yang Shi <yang.shi@...ux.alibaba.com>,
        Jann Horn <jannh@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        "Victor Kamensky (kamensky)" <kamensky@...co.com>,
        xe-linux-external@...co.com, Stefan Strogin <sstrogin@...co.com>,
        Enke Chen <enkechen@...co.com>
Subject: Re: [PATCH] kernel/signal: Signal-based pre-coredump notification

Hi, Christian:

As I replied to Jann, I will remove the code that does the setting on others
to make the code simpler and more secure.

Thanks.  -- Enke

>> +static bool set_predump_signal_perm(struct task_struct *p)
>> +{
>> +	const struct cred *cred = current_cred(), *pcred = __task_cred(p);
>> +
>> +	return uid_eq(pcred->uid, cred->euid) ||
>> +	       uid_eq(pcred->euid, cred->euid) ||
>> +	       capable(CAP_SYS_ADMIN);
> 
> So before proceeding I'd like to discuss at least two points:
> - how does this interact with the dumpability of a process?
> - do we need the capable(CAP_SYS_ADMIN) restriction to init_user_ns?
>   Seems we could make this work per-user-ns just like
>   PRCTL_SET_PDEATHSIG does?
> 
>> +}