Date: Tue, 28 Nov 2017 09:33:19 -0800 From: Linus Torvalds <torvalds@...ux-foundation.org> To: "Eric W. Biederman" <ebiederm@...ssion.com> Cc: "Tobin C. Harding" <me@...in.cc>, "Jason A. Donenfeld" <Jason@...c4.com>, "Theodore Ts'o" <tytso@....edu>, Kees Cook <keescook@...omium.org>, Paolo Bonzini <pbonzini@...hat.com>, Tycho Andersen <tycho@...ho.ws>, "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>, Radim Krčmář <rkrcmar@...hat.com>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, KVM list <kvm@...r.kernel.org>, "kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com> Subject: Re: [PATCH 0/5] add printk specifier %px, unique identifier On Mon, Nov 27, 2017 at 10:26 PM, Eric W. Biederman <ebiederm@...ssion.com> wrote: >> >> Oh well, I just did /proc/<pid>/stack by making it just print 0 >> unconditionally rather than the hex number. > > Patch? Oh, apparently I never pushed out yesterday. The patch literally just affects the (useless) hex number. So: cat /proc/self/stack now prints out [<0>] proc_pid_stack+0xaa/0x100 [<0>] proc_single_show+0x48/0x80 [<0>] seq_read+0xd2/0x410 ... instead of putting some randomized kernel address there. I considered getting rid of the whole "[<>]" thing, but that's where "maybe there are tools that parse this" came in. I doubt there are any, though. If proc-ps doesn't look at this, I don't know what could. But the format change might as well be a separate thing if somebody cares deeply. Linus
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