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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: [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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