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From: Ingo Molnar <mingo@kernel.org>
To: Jann Horn <jannh@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	"H. Peter Anvin" <hpa@zytor.com>,
	the arch/x86 maintainers <x86@kernel.org>,
	Andrey Ryabinin <aryabinin@virtuozzo.com>,
	Alexander Potapenko <glider@google.com>,
	Dmitry Vyukov <dvyukov@google.com>,
	kasan-dev <kasan-dev@googlegroups.com>,
	kernel list <linux-kernel@vger.kernel.org>,
	Andrey Konovalov <andreyknvl@google.com>,
	Andy Lutomirski <luto@kernel.org>,
	Sean Christopherson <sean.j.christopherson@intel.com>,
	Andi Kleen <ak@linux.intel.com>
Subject: Re: [PATCH v3 2/4] x86/traps: Print non-canonical address on #GP
Date: Wed, 20 Nov 2019 13:30:58 +0100	[thread overview]
Message-ID: <20191120123058.GA17296@gmail.com> (raw)
In-Reply-To: <CAG48ez0Frp4-+xHZ=UhbHh0hC_h-1VtJfwHw=kDo6NahyMv1ig@mail.gmail.com>


* Jann Horn <jannh@google.com> wrote:

> You mean something like this?
> 
> ========================
> diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
> index 9b23c4bda243..16a6bdaccb51 100644
> --- a/arch/x86/kernel/traps.c
> +++ b/arch/x86/kernel/traps.c
> @@ -516,32 +516,36 @@ dotraplinkage void do_bounds(struct pt_regs
> *regs, long error_code)
>   * On 64-bit, if an uncaught #GP occurs while dereferencing a non-canonical
>   * address, return that address.
>   */
> -static unsigned long get_kernel_gp_address(struct pt_regs *regs)
> +static bool get_kernel_gp_address(struct pt_regs *regs, unsigned long *addr,
> +                                          bool *non_canonical)

Yeah, that's pretty much the perfect end result!

> I guess that could potentially be useful if a #GP is triggered by
> something like an SSE alignment error? I'll add it in unless someone
> else complains.

Yeah - also it's correct information about the context of the fault, so 
it probably cannot *hurt*, and will allow us to debug/validate everything 
in this area faster.

> > > +#define GPFSTR "general protection fault"
> > >  dotraplinkage void
> >
> > Please separate macro and function definitions by an additional newline.
> 
> Will change it.

Thanks!

	Ingo

  reply	other threads:[~2019-11-20 12:31 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-20 10:36 [PATCH v3 1/4] x86/insn-eval: Add support for 64-bit kernel mode Jann Horn
2019-11-20 10:36 ` [PATCH v3 2/4] x86/traps: Print non-canonical address on #GP Jann Horn
2019-11-20 11:18   ` Ingo Molnar
2019-11-20 11:24     ` Borislav Petkov
2019-11-20 12:25       ` Jann Horn
2019-11-20 12:41         ` Borislav Petkov
2019-11-20 13:16         ` Ingo Molnar
2019-11-20 13:23           ` Jann Horn
2019-11-20 14:05             ` Ingo Molnar
2019-11-20 12:14     ` Jann Horn
2019-11-20 12:30       ` Ingo Molnar [this message]
2019-11-20 12:39         ` Borislav Petkov
2019-11-20 12:42           ` Jann Horn
2019-11-20 13:28           ` Ingo Molnar
2019-11-20 13:39             ` Borislav Petkov
2019-11-20 16:21               ` Sean Christopherson
2019-11-20 17:37                 ` Borislav Petkov
2019-11-20 10:36 ` [PATCH v3 3/4] x86/dumpstack: Split out header line printing from __die() Jann Horn
2019-11-20 10:36 ` [PATCH v3 4/4] x86/kasan: Print original address on #GP Jann Horn

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