From: Andrew Lutomirski <luto@mit.edu>
To: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>,
x86@kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 4/5] x86-64: Replace vsyscall gettimeofday fallback with int 0xcc
Date: Sun, 29 May 2011 16:04:36 -0400 [thread overview]
Message-ID: <BANLkTikHQ8+44K8f3tB87XmroX=EQYAS6g@mail.gmail.com> (raw)
In-Reply-To: <20110529200131.GA23390@elte.hu>
On Sun, May 29, 2011 at 4:01 PM, Ingo Molnar <mingo@elte.hu> wrote:
>
> * Andrew Lutomirski <luto@mit.edu> wrote:
>
>> On Sun, May 29, 2011 at 3:49 PM, Ingo Molnar <mingo@elte.hu> wrote:
>> >
>> > * Andrew Lutomirski <luto@mit.edu> wrote:
>> >
>> >> > Ok, i suspect you marked it 0xCC because that's the INT3 instruction
>> >> > - not very useful for exploits?
>> >>
>> >> Exactly.
>> >>
>> >> The comments in irq_vectors.h make it sound like vectors 0x81..0xed
>> >> are used for device interrupts but AFAICT it's only 0x20..0x39 that
>> >> are used, so the precise choice of vector doesn't matter that much.
>> >
>> > No, we use almost all of the vector space for device interrupts. Why
>> > do you think only 0x20..0x39 is used?
>>
>> Possibility my inability to understand all the IRQ mapping code in
>> just half an hour of trying.
>
> Hey, you managed to find all the scattered pieces in just half an
> hour, i'm impressed ;-)
grep and an SSD are amazing. I'll add the BUG_ON just to satisfy my
paranoia. I'll also update the comment in irq_vectors.h.
--Andy
next prev parent reply other threads:[~2011-05-29 20:04 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-27 17:38 [PATCH 0/5] x86-64: Remove syscall instructions at fixed addresses Andy Lutomirski
2011-05-27 17:38 ` [PATCH 1/5] x86-64: Fix alignment of jiffies variable Andy Lutomirski
2011-05-27 17:38 ` [PATCH 2/5] x86-64: Give vvars their own page Andy Lutomirski
2011-05-29 20:34 ` Borislav Petkov
2011-05-30 1:37 ` Andrew Lutomirski
2011-05-27 17:38 ` [PATCH 3/5] x86-64: Remove kernel.vsyscall64 sysctl Andy Lutomirski
2011-05-27 17:38 ` [PATCH 4/5] x86-64: Replace vsyscall gettimeofday fallback with int 0xcc Andy Lutomirski
2011-05-29 19:10 ` Ingo Molnar
2011-05-29 19:23 ` Andrew Lutomirski
2011-05-29 19:43 ` Ingo Molnar
2011-05-29 19:49 ` Ingo Molnar
2011-05-29 19:57 ` Andrew Lutomirski
2011-05-29 20:01 ` Ingo Molnar
2011-05-29 20:04 ` Andrew Lutomirski [this message]
2011-05-29 20:26 ` Borislav Petkov
2011-05-29 19:49 ` Jesper Juhl
2011-05-29 19:54 ` Jesper Juhl
2011-05-29 20:05 ` Andrew Lutomirski
2011-05-29 20:07 ` Jesper Juhl
2011-05-27 17:38 ` [PATCH 5/5] x86-64: Map the HPET NX Andy Lutomirski
2011-05-29 19:19 ` [PATCH 0/5] x86-64: Remove syscall instructions at fixed addresses Ingo Molnar
2011-05-31 2:33 ` Andrew Lutomirski
2011-05-31 8:07 ` Ingo Molnar
2011-05-31 12:27 ` Andrew Lutomirski
2011-05-31 12:54 ` Ingo Molnar
2011-05-31 13:06 ` Andrew Lutomirski
2011-05-31 13:11 ` Ingo Molnar
2011-05-31 13:17 ` Andrew Lutomirski
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