From: Russell King - ARM Linux <linux@armlinux.org.uk>
To: Thomas Garnier <thgarnie@google.com>
Cc: "Nicolas Pitre" <nicolas.pitre@linaro.org>,
"Mark Rutland" <mark.rutland@arm.com>,
kernel-hardening@lists.openwall.com,
"Frederic Weisbecker" <fweisbec@gmail.com>,
"Sebastian Andrzej Siewior" <bigeasy@linutronix.de>,
"Will Deacon" <will.deacon@arm.com>,
linux-kernel@vger.kernel.org,
"David Howells" <dhowells@redhat.com>,
"Dave Hansen" <dave.hansen@intel.com>,
"Alexander Potapenko" <glider@google.com>,
"Jan Beulich" <JBeulich@suse.com>,
"H . Peter Anvin" <hpa@zytor.com>,
"Borislav Petkov" <bp@alien8.de>,
"Ingo Molnar" <mingo@kernel.org>,
"Pavel Tikhomirov" <ptikhomirov@virtuozzo.com>,
"Chris Metcalf" <cmetcalf@mellanox.com>,
"Helge Deller" <deller@gmx.de>,
x86@kernel.org, "René Nyffenegger" <mail@renenyffenegger.ch>,
"Catalin Marinas" <catalin.marinas@arm.com>,
"Paul E . McKenney" <paulmck@linux.vnet.ibm.com>,
"Stephen Smalley" <sds@tycho.nsa.gov>,
"Petr Mladek" <pmladek@suse.com>
Subject: Re: [PATCH v1 1/4] syscalls: Restore address limit after a syscall
Date: Wed, 8 Mar 2017 21:58:15 +0000 [thread overview]
Message-ID: <20170308215814.GG21222@n2100.armlinux.org.uk> (raw)
In-Reply-To: <20170308213844.131877-1-thgarnie@google.com>
On Wed, Mar 08, 2017 at 01:38:41PM -0800, Thomas Garnier wrote:
> This patch prevents a syscall to modify the address limit of the
> caller. The address limit is kept by the syscall wrapper and restored
> just after the syscall ends.
I would much rather architectures were given the opportunity to code up
checks like this efficiently (iow, inline in the exit path assembly),
rather than having to unconditionally call an additional function on
every syscall, with its register saving overheads.
--
RMK's Patch system: http://www.armlinux.org.uk/developer/patches/
FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up
according to speedtest.net.
next prev parent reply other threads:[~2017-03-08 21:58 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-08 21:38 [PATCH v1 1/4] syscalls: Restore address limit after a syscall Thomas Garnier
2017-03-08 21:38 ` [PATCH v1 2/4] x86/syscalls: Specific usage of verify_pre_usermode_state Thomas Garnier
2017-03-08 21:38 ` [PATCH v1 3/4] arm/syscalls: " Thomas Garnier
2017-03-08 21:49 ` Russell King - ARM Linux
2017-03-08 22:05 ` Nicolas Pitre
2017-03-08 22:33 ` Thomas Garnier
2017-03-08 21:38 ` [PATCH v1 4/4] arm64/syscalls: " Thomas Garnier
2017-03-08 21:57 ` [PATCH v1 1/4] syscalls: Restore address limit after a syscall Kees Cook
2017-03-09 1:13 ` Thomas Garnier
2017-03-08 21:58 ` Russell King - ARM Linux [this message]
2017-03-08 22:20 ` Andy Lutomirski
2017-03-08 22:27 ` Thomas Garnier
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