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
next prev parent 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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