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

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Message-ID: <CAFCwf10bKhXsmmoQG4FP9FT6jq2dJYrMZOzk424HGbwLCp9MjA@mail.gmail.com>
Date:   Thu, 7 Mar 2019 07:42:18 +0200
From:   Oded Gabbay <oded.gabbay@...il.com>
To:     Kees Cook <keescook@...omium.org>
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 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.
Oded


>
> -Kees
>
> >
> > Suggested-by: Joe Perches <joe@...ches.com>
> > Signed-off-by: Oded Gabbay <oded.gabbay@...il.com>
> > ---
> >  drivers/misc/habanalabs/goya/goya.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/misc/habanalabs/goya/goya.c b/drivers/misc/habanalabs/goya/goya.c
> > index c4f3ec1e9d8b..238dd57c541b 100644
> > --- a/drivers/misc/habanalabs/goya/goya.c
> > +++ b/drivers/misc/habanalabs/goya/goya.c
> > @@ -4293,7 +4293,7 @@ static int goya_parse_cb_no_ext_quque(struct hl_device *hdev,
> >                         return 0;
> >
> >                 dev_err(hdev->dev,
> > -                       "Internal CB address %p + 0x%x is not in SRAM nor in DRAM\n",
> > +                       "Internal CB address %px + 0x%x is not in SRAM nor in DRAM\n",
> >                         parser->user_cb, parser->user_cb_size);
> >
> >                 return -EFAULT;
> > --
> > 2.18.0
> >
>
>
> --
> Kees Cook