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Date:   Thu, 9 Nov 2017 10:24:32 +0530
From:   Kaiwan N Billimoria <>
To:     Linus Torvalds <>
Cc:     Laura Abbott <>,
        "Tobin C. Harding" <>,
        "Jason A. Donenfeld" <>,
        "Theodore Ts'o" <>, Kees Cook <>,
        Paolo Bonzini <>,
        Tycho Andersen <>,
        "Roberts, William C" <>,
        Tejun Heo <>,
        Jordan Glover <>,
        Greg KH <>,
        Petr Mladek <>, Joe Perches <>,
        Ian Campbell <>,
        Sergey Senozhatsky <>,
        Catalin Marinas <>,
        Will Deacon <>,
        Steven Rostedt <>,
        Chris Fries <>,
        Dave Weinstein <>,
        Daniel Micay <>,
        Djalal Harouni <>,
        Linux Kernel Mailing List <>,
        Network Development <>,
        David Miller <>
Subject: Re: [kernel-hardening] [PATCH v4] scripts: add

On Thu, Nov 9, 2017 at 10:13 AM, Kaiwan N Billimoria
<> 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 :
*-k* kallsyms::
    Used with *-c*, it overrides where to read the kallsyms file from.
    By default, /proc/kallsyms is used. *-k* will override the file to
    read the kallsyms from. This can be useful if the trace.dat file
    to create is from another machine. Just copy the /proc/kallsyms
    file locally, and use *-k* to point to that file.

> Am unsure about this, but kprobes? (/jprobes/kretprobes), and by
> extension, wrappers over this infra (like SystemTap)?
> I (hazily) recollect a script I once wrote (years back though) that
> collects kernel virtual addresses off of kallsyms for the purpose of
> passing them to a 'helper' kernel module that uses kprobes. I realize
> that 'modern' kprobes exposes APIs that just require the symbolic name
> & that they're anyway at kernel privilege... but the point is, a
> usermode script was picking up and passing the kernel addresses.
> Also, what about kernel addresses exposed via
> Oh, just checked, it's root rw only.. pl ignore.

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