From: "H.J. Lu" <hjl.tools@gmail.com>
To: Bernd Schmidt <bernds@codesourcery.com>
Cc: gcc-patches@gcc.gnu.org, "H. Peter Anvin" <hpa@zytor.com>,
Eric Botcazou <ebotcazou@adacore.com>
Subject: Re: [x32] PATCH: Remove ix86_promote_function_mode
Date: Mon, 20 Jun 2011 14:13:00 -0000 [thread overview]
Message-ID: <BANLkTikvHuARo_ASko8_b3pZMuFtAN46cw@mail.gmail.com> (raw)
In-Reply-To: <4DFF50E0.8030404@codesourcery.com>
On Mon, Jun 20, 2011 at 6:53 AM, Bernd Schmidt <bernds@codesourcery.com> wrote:
> On 06/20/2011 03:51 PM, H.J. Lu wrote:
>> Promote pointers to Pmode when passing/returning in registers is
>> a security concern.
>
> Whuh?
>
Peter, do you think it is safe to assume upper 32bits are zero in
user space for x32? Kernel isn't a problem since pointer is 64bit
in kernel and we don't pass pointers on stack to kernel.
--
H.J.
next prev parent reply other threads:[~2011-06-20 14:02 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-20 13:55 H.J. Lu
2011-06-20 13:57 ` Bernd Schmidt
2011-06-20 14:13 ` H.J. Lu [this message]
2011-06-20 14:41 ` H. Peter Anvin
2011-06-20 14:44 ` Jeff Law
2011-06-20 15:11 ` H.J. Lu
2011-06-20 14:46 ` H.J. Lu
2011-06-20 15:28 ` H. Peter Anvin
2011-06-20 22:58 ` Richard Henderson
2011-06-21 0:33 ` H. Peter Anvin
2011-06-21 0:34 ` Richard Henderson
2011-06-21 1:15 ` H. Peter Anvin
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