linux-kernel - Re: [PATCH] habanalabs: use %px instead of %p in error print

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:   Thu, 7 Mar 2019 07:54:01 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Oded Gabbay <oded.gabbay@...il.com>
Cc:     Greg KH <gregkh@...uxfoundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Joe Perches <joe@...ches.com>
Subject: Re: [PATCH] habanalabs: use %px instead of %p in error print

On Wed, Mar 6, 2019 at 9:42 PM Oded Gabbay <oded.gabbay@...il.com> wrote:
>
> On Thu, Mar 7, 2019 at 5:46 AM Kees Cook <keescook@...omium.org> wrote:
> >
> > On Sat, Mar 2, 2019 at 1:43 AM Oded Gabbay <oded.gabbay@...il.com> wrote:
> > >
> > > When parsing the address of an internal command buffer, the driver prints
> > > an error if the buffer's address is not in the range of the device's DRAM
> > > or SRAM memory address space.
> > >
> > > Use %px to print the real address that the user gave the driver and not a
> > > hashed value, so the user will get a clue regarding the origin of his
> > > error.
> > >
> > > Note that if the print occurs, the pointer that is printed is a
> > > user's virtual address and not some kind of physical address.
> >
> > Err, which virtual address space is this? If this is mapped into the
> > kernel's virtual address space, this should not be %px...
> No, it's not mapped to kernel in any way.
> It's supposed to be an address in the device's address space.
> As this is an error message, it's either a wrong address in the
> device's address space, or it's a user-space virtual address.

Okay, thanks! :)

-- 
Kees Cook