Date: Thu, 9 Nov 2017 10:24:32 +0530 From: Kaiwan N Billimoria <kaiwan.billimoria@...il.com> To: Linus Torvalds <torvalds@...ux-foundation.org> Cc: 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>, Steven Rostedt <rostedt@...dmis.org>, 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: [PATCH v4] scripts: add leaking_addresses.pl 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 : ... *-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 System.map? > Oh, just checked, it's root rw only.. pl ignore.
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