From mboxrd@z Thu Jan  1 00:00:00 1970
From: Steven Rostedt <rostedt@goodmis.org>
Subject: Re: [kernel-hardening] [PATCH v4] scripts: add leaking_addresses.pl
Date: Thu, 9 Nov 2017 13:11:11 -0500
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Cc: Linus Torvalds <torvalds@linux-foundation.org>,
        Laura Abbott <labbott@redhat.com>,
        "Tobin C. Harding" <me@tobin.cc>,
        "kernel-hardening@lists.openwall.com"
        <kernel-hardening@lists.openwall.com>,
        "Jason A. Donenfeld" <Jason@zx2c4.com>,
        "Theodore Ts'o" <tytso@mit.edu>, Kees Cook <keescook@chromium.org>,
        Paolo Bonzini <pbonzini@redhat.com>,
        Tycho Andersen <tycho@docker.com>,
        "Roberts, William C" <william.c.roberts@intel.com>,
        Tejun Heo <tj@kernel.org>,
        Jordan Glover <Golden_Miller83@protonmail.ch>,
        Greg KH <gregkh@linuxfoundation.org>,
        Petr Mladek <pmladek@suse.com>, Joe Perches <joe@perches.com>,
        Ian Campbell <ijc@hellion.org.uk>,
        Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <wilal.deacon@arm
To: Kaiwan N Billimoria <kaiwan.billimoria@gmail.com>
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On Thu, 9 Nov 2017 10:24:32 +0530
Kaiwan N Billimoria <kaiwan.billimoria@gmail.com> wrote:

> On Thu, Nov 9, 2017 at 10:13 AM, Kaiwan N Billimoria
> <kaiwan.billimoria@gmail.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