linux-kernel - Re: [kernel-hardening] [PATCH v4] scripts: add leaking

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Message-ID: <20171109131111.499057ab@gandalf.local.home>
Date:   Thu, 9 Nov 2017 13:11:11 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Kaiwan N Billimoria <kaiwan.billimoria@...il.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Laura Abbott <labbott@...hat.com>,
        "Tobin C. Harding" <me@...in.cc>,
        "kernel-hardening@...ts.openwall.com" 
        <kernel-hardening@...ts.openwall.com>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        "Theodore Ts'o" <tytso@....edu>, Kees Cook <keescook@...omium.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Tycho Andersen <tycho@...ker.com>,
        "Roberts, William C" <william.c.roberts@...el.com>,
        Tejun Heo <tj@...nel.org>,
        Jordan Glover <Golden_Miller83@...tonmail.ch>,
        Greg KH <gregkh@...uxfoundation.org>,
        Petr Mladek <pmladek@...e.com>, Joe Perches <joe@...ches.com>,
        Ian Campbell <ijc@...lion.org.uk>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <wilal.deacon@....com>,
        Chris Fries <cfries@...gle.com>,
        Dave Weinstein <olorin@...gle.com>,
        Daniel Micay <danielmicay@...il.com>,
        Djalal Harouni <tixxdz@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>
Subject: Re: [kernel-hardening] [PATCH v4] scripts: add leaking_addresses.pl

On Thu, 9 Nov 2017 10:24:32 +0530
Kaiwan N Billimoria <kaiwan.billimoria@...il.com> wrote:

> On Thu, Nov 9, 2017 at 10:13 AM, Kaiwan N Billimoria
> <kaiwan.billimoria@...il.com> wrote:
> >> But I don't know if there is anything else than the profiling code
> >> that _really_ wants access to /proc/kallsyms in user space as a
> >> regular user.  
> >  
> 
> Front-ends to ftrace, like trace-cmd?
> [from the trace-cmd git repo (Steve Rostedt, pl stand up, pl stand up :-)
> Documentation/trace-cmd-restore.1.txt :

Yes, profiling and tracing are similar. And you need to be root to run
the recording anyway. Thus, as long as root user can read kallsyms,
trace-cmd should be fine. As trace-cmd requires root access to do any
ftrace tracing.

-- Steve