From: "H. Peter Anvin" <hpa@zytor.com>
To: Brian Gerst <brgerst@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>,
mingo@redhat.com, linux-kernel@vger.kernel.org,
tglx@linutronix.de, linux-tip-commits@vger.kernel.org
Subject: Re: [tip:x86/asm] x86-64: Use normal ptregs stub for execve
Date: Wed, 27 Jan 2010 08:28:23 -0800 [thread overview]
Message-ID: <4B6069A7.1020907@zytor.com> (raw)
In-Reply-To: <73c1f2161001270721x3d07b507lb78fa8c53567dcaa@mail.gmail.com>
On 01/27/2010 07:21 AM, Brian Gerst wrote:
>
> I see what is going on. Grub is a 32-bit statically linked executable
> even on a 64-bit distro. The old execve stub forced return to
> userspace via iret, but PTREGSCALL apparently doesn't. This means
> that the 32-bit %cs isn't getting set. Drop this patch for now.
>
OK, I presume that breaks execing any 32-bit app, not just statically
linked (eww...)
Yet one more case of Grub making me shudder, though :-/
-hpa
--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.
prev parent reply other threads:[~2010-01-27 16:28 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-25 15:47 [PATCH] x86-64: Use normal ptregs stub for execve Brian Gerst
2010-01-27 8:39 ` [tip:x86/asm] " tip-bot for Brian Gerst
2010-01-27 13:07 ` Ingo Molnar
2010-01-27 15:21 ` Brian Gerst
2010-01-27 16:28 ` H. Peter Anvin [this message]
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