Date: Thu, 5 Oct 2017 08:55:26 -0500 From: Bjorn Helgaas <bhelgaas@...gle.com> To: Linus Torvalds <torvalds@...ux-foundation.org> Cc: "Roberts, William C" <william.c.roberts@...el.com>, Tejun Heo <tj@...nel.org>, Jordan Glover <Golden_Miller83@...tonmail.ch>, "Tobin C. Harding" <me@...in.cc>, 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>, "kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com>, Catalin Marinas <catalin.marinas@....com>, Will Deacon <will.deacon@....com>, Steven Rostedt <rostedt@...dmis.org>, Chris Fries <cfries@...gle.com>, Dave Weinstein <olorin@...gle.com> Subject: Re: [RFC V2 0/6] add more kernel pointer filter options On Wed, Oct 4, 2017 at 7:09 PM, Linus Torvalds <torvalds@...ux-foundation.org> wrote: > On Wed, Oct 4, 2017 at 4:52 PM, Linus Torvalds > <torvalds@...ux-foundation.org> wrote: >> >> It also shows >> >> software IO TLB [mem PA-PB] (64MB) mapped at [VA-VB] >> >> for example. And THIS IS IMPORTANT! The physical address is shown >> with "%#010llx". > > Oh, and I added Tejun for the percpu printout, but didn't add Bjorn > for this one. > > Like the percpu one, I suspect that this pr_info() isn't really > important enough to stay, and while it doesn't sound nearly as > interesting as the percpu virtual address to an attacker, it probably > isn't important enough to leak kernel (and hardware) data for. > > Bjorn? My only interest in the "software IO TLB" message was to make the style match other similar things; I personally don't care whether this message exists at all. I haven't seen the whole series, but I do hope %pR remains useful. We use it often to analyze PCI BAR assignment issues. Bjorn
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