From: "H. Peter Anvin" <hpa@zytor.com>
To: Kees Cook <keescook@chromium.org>
Cc: linux-kernel@vger.kernel.org,
kernel-hardening@lists.openwall.com,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
x86@kernel.org, Jarkko Sakkinen <jarkko.sakkinen@intel.com>,
Matthew Garrett <mjg@redhat.com>,
Matt Fleming <matt.fleming@intel.com>,
Eric Northup <digitaleric@google.com>,
Dan Rosenberg <drosenberg@vsecurity.com>,
Julien Tinnes <jln@google.com>, Will Drewry <wad@chromium.org>
Subject: [kernel-hardening] Re: [PATCH 2/6] x86: kaslr: move CPU flags out of cpucheck
Date: Thu, 25 Apr 2013 15:00:55 -0700 [thread overview]
Message-ID: <5179A797.9040200@zytor.com> (raw)
In-Reply-To: <1366926860-26776-3-git-send-email-keescook@chromium.org>
On 04/25/2013 02:54 PM, Kees Cook wrote:
> Since has_eflag() and has_fpu() are 32-bit only, short-circuit the
> routines on 64-bit when they are built without -m32. This also refactors
> the calls to cpuid to make them PIC-safe on 32-bit.
These functions can trivially be made 32- and 64-bit agnostic by
changing "u32" to "unsigned long" and drop the -l suffixes in the
assembly code.
-hpa
WARNING: multiple messages have this Message-ID (diff)
From: "H. Peter Anvin" <hpa@zytor.com>
To: Kees Cook <keescook@chromium.org>
Cc: linux-kernel@vger.kernel.org,
kernel-hardening@lists.openwall.com,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
x86@kernel.org, Jarkko Sakkinen <jarkko.sakkinen@intel.com>,
Matthew Garrett <mjg@redhat.com>,
Matt Fleming <matt.fleming@intel.com>,
Eric Northup <digitaleric@google.com>,
Dan Rosenberg <drosenberg@vsecurity.com>,
Julien Tinnes <jln@google.com>, Will Drewry <wad@chromium.org>
Subject: Re: [PATCH 2/6] x86: kaslr: move CPU flags out of cpucheck
Date: Thu, 25 Apr 2013 15:00:55 -0700 [thread overview]
Message-ID: <5179A797.9040200@zytor.com> (raw)
In-Reply-To: <1366926860-26776-3-git-send-email-keescook@chromium.org>
On 04/25/2013 02:54 PM, Kees Cook wrote:
> Since has_eflag() and has_fpu() are 32-bit only, short-circuit the
> routines on 64-bit when they are built without -m32. This also refactors
> the calls to cpuid to make them PIC-safe on 32-bit.
These functions can trivially be made 32- and 64-bit agnostic by
changing "u32" to "unsigned long" and drop the -l suffixes in the
assembly code.
-hpa
next prev parent reply other threads:[~2013-04-25 22:00 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-25 21:54 [kernel-hardening] [PATCH v3 0/6] kernel ASLR Kees Cook
2013-04-25 21:54 ` Kees Cook
2013-04-25 21:54 ` [kernel-hardening] [PATCH 1/6] x86: kaslr: move ELF relocation handling to C Kees Cook
2013-04-25 21:54 ` Kees Cook
2013-04-25 21:54 ` [kernel-hardening] [PATCH 2/6] x86: kaslr: move CPU flags out of cpucheck Kees Cook
2013-04-25 21:54 ` Kees Cook
2013-04-25 22:00 ` H. Peter Anvin [this message]
2013-04-25 22:00 ` H. Peter Anvin
2013-04-26 15:28 ` [kernel-hardening] " Kees Cook
2013-04-26 15:28 ` Kees Cook
2013-04-25 21:54 ` [kernel-hardening] [PATCH 3/6] x86: kaslr: return location from decompress_kernel Kees Cook
2013-04-25 21:54 ` Kees Cook
2013-04-25 21:54 ` [kernel-hardening] [PATCH 4/6] x86: kaslr: select random base offset Kees Cook
2013-04-25 21:54 ` Kees Cook
2013-04-26 6:13 ` [kernel-hardening] " Mathias Krause
2013-04-26 15:30 ` Kees Cook
2013-04-25 21:54 ` [kernel-hardening] [PATCH 5/6] x86: kaslr: select memory region from e820 maps Kees Cook
2013-04-25 21:54 ` Kees Cook
2013-04-25 21:54 ` [kernel-hardening] [PATCH 6/6] x86: kaslr: report kernel offset on panic Kees Cook
2013-04-25 21:54 ` Kees Cook
2013-04-25 22:01 ` [kernel-hardening] Re: [PATCH v3 0/6] kernel ASLR H. Peter Anvin
2013-04-25 22:01 ` H. Peter Anvin
2013-04-26 18:53 ` [kernel-hardening] " Kees Cook
2013-04-26 18:53 ` Kees Cook
-- strict thread matches above, loose matches on Subject: below --
2013-04-26 19:03 [kernel-hardening] [PATCH v4 " Kees Cook
2013-04-26 19:03 ` [kernel-hardening] [PATCH 2/6] x86: kaslr: move CPU flags out of cpucheck Kees Cook
2013-04-26 21:47 ` [kernel-hardening] " H. Peter Anvin
2013-04-26 22:14 ` H. Peter Anvin
2013-04-29 17:49 ` Kees Cook
2013-04-29 17:52 ` Kees Cook
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