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From: Russell King - ARM Linux <linux@armlinux.org.uk>
To: Kees Cook <keescook@chromium.org>
Cc: "Martin Schwidefsky" <schwidefsky@de.ibm.com>,
	"Linus Torvalds" <torvalds@linux-foundation.org>,
	"Thomas Garnier" <thgarnie@google.com>,
	"Greg KH" <greg@kroah.com>, "Ingo Molnar" <mingo@kernel.org>,
	"Daniel Micay" <danielmicay@gmail.com>,
	"Heiko Carstens" <heiko.carstens@de.ibm.com>,
	"Dave Hansen" <dave.hansen@intel.com>,
	"Arnd Bergmann" <arnd@arndb.de>,
	"Thomas Gleixner" <tglx@linutronix.de>,
	"David Howells" <dhowells@redhat.com>,
	"René Nyffenegger" <mail@renenyffenegger.ch>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	"Paul E . McKenney" <paulmck@linux.vnet.ibm.com>,
	"Eric W . Biederman" <ebiederm@xmission.com>,
	"Oleg Nesterov" <oleg@redhat.com>,
	"Pavel Tikhomirov" <ptikhomirov@virtuozzo.com>,
	"Ingo Molnar" <mingo@redhat.com>,
	"H . Peter Anvin" <hpa@zytor.com>,
	"Andy Lutomirski" <luto@kernel.org>,
	"Paolo Bonzini" <pbonzini@redhat.com>,
	"Rik van Riel" <riel@redhat.com>,
	"Josh Poimboeuf" <jpoimboe@redhat.com>,
	"Borislav Petkov" <bp@alien8.de>,
	"Brian Gerst" <brgerst@gmail.com>,
	"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
	"Christian Borntraeger" <borntraeger@de.ibm.com>,
	"Will Deacon" <will.deacon@arm.com>,
	"Catalin Marinas" <catalin.marinas@arm.com>,
	"Mark Rutland" <mark.rutland@arm.com>,
	"James Morse" <james.morse@arm.com>,
	linux-s390 <linux-s390@vger.kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	"Linux API" <linux-api@vger.kernel.org>,
	"the arch/x86 maintainers" <x86@kernel.org>,
	"linux-arm-kernel@lists.infradead.org"
	<linux-arm-kernel@lists.infradead.org>,
	"Kernel Hardening" <kernel-hardening@lists.openwall.com>,
	"Peter Zijlstra" <a.p.zijlstra@chello.nl>,
	"Al Viro" <viro@zeniv.linux.org.uk>
Subject: Re: [kernel-hardening] Re: [PATCH v9 1/4] syscalls: Verify address limit before returning to user-mode
Date: Fri, 12 May 2017 20:08:35 +0100	[thread overview]
Message-ID: <20170512190835.GN22219@n2100.armlinux.org.uk> (raw)
In-Reply-To: <CAGXu5jL9vUrn4kpjO+qa4cHmWBypeqP17OGbrMs=5Nz0YpQMZw@mail.gmail.com>

On Fri, May 12, 2017 at 12:01:59PM -0700, Kees Cook wrote:
> Yeah, the risk for "corrupted addr_limit" is mainly a concern for
> archs with addr_limit on the kernel stack. If I'm reading things
> correctly, that means, from the archs I've been paying closer
> attention to, it's an issue for arm, mips, and powerpc:

I'd first want to uninline everything in uaccess.h first that makes
use of access_ok() - which I think is something that needs to happen
anyway.

-- 
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.

WARNING: multiple messages have this Message-ID (diff)
From: Russell King - ARM Linux <linux@armlinux.org.uk>
To: Kees Cook <keescook@chromium.org>
Cc: "Martin Schwidefsky" <schwidefsky@de.ibm.com>,
	"Linus Torvalds" <torvalds@linux-foundation.org>,
	"Thomas Garnier" <thgarnie@google.com>,
	"Greg KH" <greg@kroah.com>, "Ingo Molnar" <mingo@kernel.org>,
	"Daniel Micay" <danielmicay@gmail.com>,
	"Heiko Carstens" <heiko.carstens@de.ibm.com>,
	"Dave Hansen" <dave.hansen@intel.com>,
	"Arnd Bergmann" <arnd@arndb.de>,
	"Thomas Gleixner" <tglx@linutronix.de>,
	"David Howells" <dhowells@redhat.com>,
	"René Nyffenegger" <mail@renenyffenegger.ch>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	"Paul E . McKenney" <paulmck@linux.vnet.ibm.com>,
	"Eric W . Biederman" <ebiederm@xmission.com>,
	"Oleg Nesterov" <oleg@redhat.com>,
	"Pavel Tikhomirov" <ptikhomirov@virtuozzo.com>,
	"Ingo Molnar" <mingo@redhat.com>,
	"H . Peter Anvin" <hpa@zytor.com>
Subject: Re: [kernel-hardening] Re: [PATCH v9 1/4] syscalls: Verify address limit before returning to user-mode
Date: Fri, 12 May 2017 20:08:35 +0100	[thread overview]
Message-ID: <20170512190835.GN22219@n2100.armlinux.org.uk> (raw)
In-Reply-To: <CAGXu5jL9vUrn4kpjO+qa4cHmWBypeqP17OGbrMs=5Nz0YpQMZw@mail.gmail.com>

On Fri, May 12, 2017 at 12:01:59PM -0700, Kees Cook wrote:
> Yeah, the risk for "corrupted addr_limit" is mainly a concern for
> archs with addr_limit on the kernel stack. If I'm reading things
> correctly, that means, from the archs I've been paying closer
> attention to, it's an issue for arm, mips, and powerpc:

I'd first want to uninline everything in uaccess.h first that makes
use of access_ok() - which I think is something that needs to happen
anyway.

-- 
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.

WARNING: multiple messages have this Message-ID (diff)
From: linux@armlinux.org.uk (Russell King - ARM Linux)
To: linux-arm-kernel@lists.infradead.org
Subject: [kernel-hardening] Re: [PATCH v9 1/4] syscalls: Verify address limit before returning to user-mode
Date: Fri, 12 May 2017 20:08:35 +0100	[thread overview]
Message-ID: <20170512190835.GN22219@n2100.armlinux.org.uk> (raw)
In-Reply-To: <CAGXu5jL9vUrn4kpjO+qa4cHmWBypeqP17OGbrMs=5Nz0YpQMZw@mail.gmail.com>

On Fri, May 12, 2017 at 12:01:59PM -0700, Kees Cook wrote:
> Yeah, the risk for "corrupted addr_limit" is mainly a concern for
> archs with addr_limit on the kernel stack. If I'm reading things
> correctly, that means, from the archs I've been paying closer
> attention to, it's an issue for arm, mips, and powerpc:

I'd first want to uninline everything in uaccess.h first that makes
use of access_ok() - which I think is something that needs to happen
anyway.

-- 
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.

  reply	other threads:[~2017-05-12 19:08 UTC|newest]

Thread overview: 282+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-04-28 15:32 [kernel-hardening] [PATCH v9 1/4] syscalls: Verify address limit before returning to user-mode Thomas Garnier
2017-04-28 15:32 ` Thomas Garnier
2017-04-28 15:32 ` Thomas Garnier
2017-04-28 15:32 ` Thomas Garnier
2017-04-28 15:32 ` [kernel-hardening] [PATCH v9 2/4] x86/syscalls: Optimize address limit check Thomas Garnier
2017-04-28 15:32   ` Thomas Garnier
2017-04-28 15:32   ` Thomas Garnier
2017-04-28 15:32   ` Thomas Garnier
2017-04-28 15:32 ` [kernel-hardening] [PATCH v9 3/4] arm/syscalls: " Thomas Garnier
2017-04-28 15:32   ` Thomas Garnier
2017-04-28 15:32   ` Thomas Garnier
2017-04-28 15:32   ` Thomas Garnier
2017-04-28 15:32 ` [kernel-hardening] [PATCH v9 4/4] arm64/syscalls: " Thomas Garnier
2017-04-28 15:32   ` Thomas Garnier
2017-04-28 15:32   ` Thomas Garnier
2017-04-28 15:32   ` Thomas Garnier
2017-05-05 22:18 ` [kernel-hardening] Re: [PATCH v9 1/4] syscalls: Verify address limit before returning to user-mode Thomas Garnier
2017-05-05 22:18   ` Thomas Garnier
2017-05-05 22:18   ` Thomas Garnier
2017-05-05 22:18   ` Thomas Garnier
2017-05-08  7:33   ` [kernel-hardening] " Ingo Molnar
2017-05-08  7:33     ` Ingo Molnar
2017-05-08  7:33     ` Ingo Molnar
2017-05-08  7:33     ` Ingo Molnar
2017-05-08  7:52     ` [kernel-hardening] " Ingo Molnar
2017-05-08  7:52       ` Ingo Molnar
2017-05-08  7:52       ` Ingo Molnar
2017-05-08  7:52       ` [kernel-hardening] " Ingo Molnar
2017-05-08  7:52       ` Ingo Molnar
2017-05-08 15:22       ` [kernel-hardening] " Daniel Micay
2017-05-08 15:22         ` Daniel Micay
2017-05-08 15:22         ` Daniel Micay
2017-05-08 15:26         ` Kees Cook
2017-05-08 15:26           ` Kees Cook
2017-05-08 15:26           ` Kees Cook
2017-05-08 19:51           ` Thomas Garnier
2017-05-08 19:51             ` Thomas Garnier
2017-05-08 19:51             ` Thomas Garnier
2017-05-09  6:56           ` Ingo Molnar
2017-05-09  6:56             ` Ingo Molnar
2017-05-09  6:56             ` Ingo Molnar
2017-05-09 11:10             ` Greg KH
2017-05-09 11:10               ` Greg KH
2017-05-09 11:10               ` Greg KH
2017-05-09 14:29               ` Thomas Garnier
2017-05-09 14:29                 ` Thomas Garnier
2017-05-09 14:29                 ` Thomas Garnier
2017-05-11 23:17                 ` Thomas Garnier
2017-05-11 23:17                   ` Thomas Garnier
2017-05-11 23:17                   ` Thomas Garnier
2017-05-11 23:44                   ` Linus Torvalds
2017-05-11 23:44                     ` Linus Torvalds
2017-05-11 23:44                     ` Linus Torvalds
2017-05-12  5:28                     ` Martin Schwidefsky
2017-05-12  5:28                       ` Martin Schwidefsky
2017-05-12  5:28                       ` Martin Schwidefsky
2017-05-12  5:34                       ` Kees Cook
2017-05-12  5:34                         ` Kees Cook
2017-05-12  5:34                         ` Kees Cook
2017-05-12  5:54                         ` Martin Schwidefsky
2017-05-12  5:54                           ` Martin Schwidefsky
2017-05-12  5:54                           ` Martin Schwidefsky
2017-05-12 19:01                           ` Kees Cook
2017-05-12 19:01                             ` Kees Cook
2017-05-12 19:01                             ` Kees Cook
2017-05-12 19:08                             ` Russell King - ARM Linux [this message]
2017-05-12 19:08                               ` Russell King - ARM Linux
2017-05-12 19:08                               ` Russell King - ARM Linux
2017-05-12 19:08                             ` Linus Torvalds
2017-05-12 19:08                               ` Linus Torvalds
2017-05-12 19:08                               ` Linus Torvalds
2017-05-12 19:30                               ` Kees Cook
2017-05-12 19:30                                 ` Kees Cook
2017-05-12 19:30                                 ` Kees Cook
2017-05-12 20:21                                 ` Russell King - ARM Linux
2017-05-12 20:21                                   ` Russell King - ARM Linux
2017-05-12 20:21                                   ` Russell King - ARM Linux
2017-05-12 20:30                                   ` Peter Zijlstra
2017-05-12 20:30                                     ` Peter Zijlstra
2017-05-12 20:30                                     ` Peter Zijlstra
2017-05-12 20:45                                     ` Russell King - ARM Linux
2017-05-12 20:45                                       ` Russell King - ARM Linux
2017-05-12 20:45                                       ` Russell King - ARM Linux
2017-05-12 21:00                                       ` Kees Cook
2017-05-12 21:00                                         ` Kees Cook
2017-05-12 21:00                                         ` Kees Cook
2017-05-12 21:04                                         ` Kees Cook
2017-05-12 21:04                                           ` Kees Cook
2017-05-12 21:04                                           ` Kees Cook
2017-05-13  7:21                                     ` Christoph Hellwig
2017-05-13  7:21                                       ` Christoph Hellwig
2017-05-13  7:21                                       ` Christoph Hellwig
2017-05-12 21:06                                   ` Al Viro
2017-05-12 21:06                                     ` Al Viro
2017-05-12 21:06                                     ` Al Viro
2017-05-12 21:16                                     ` [kernel-hardening] " Daniel Micay
2017-05-12 21:16                                       ` Daniel Micay
2017-05-12 21:16                                       ` Daniel Micay
2017-05-12 21:17                                     ` Kees Cook
2017-05-12 21:17                                       ` Kees Cook
2017-05-12 21:17                                       ` Kees Cook
2017-05-12 21:23                                       ` Daniel Micay
2017-05-12 21:23                                         ` Daniel Micay
2017-05-12 21:23                                         ` Daniel Micay
2017-05-12 21:41                                       ` Al Viro
2017-05-12 21:41                                         ` Al Viro
2017-05-12 21:41                                         ` Al Viro
2017-05-12 21:47                                         ` Rik van Riel
2017-05-12 21:47                                           ` Rik van Riel
2017-05-12 21:47                                           ` Rik van Riel
2017-05-12 22:57                                           ` Al Viro
2017-05-12 22:57                                             ` Al Viro
2017-05-12 22:57                                             ` Al Viro
2017-05-12 21:50                                         ` Kees Cook
2017-05-12 21:50                                           ` Kees Cook
2017-05-12 21:50                                           ` Kees Cook
2017-05-12  6:57                         ` Ingo Molnar
2017-05-12  6:57                           ` Ingo Molnar
2017-05-12  6:57                           ` Ingo Molnar
2017-05-12  6:13                     ` Andy Lutomirski
2017-05-12  6:13                       ` Andy Lutomirski
2017-05-12  6:13                       ` Andy Lutomirski
2017-05-12  6:58                     ` Ingo Molnar
2017-05-12  6:58                       ` Ingo Molnar
2017-05-12  6:58                       ` Ingo Molnar
2017-05-12 17:05                       ` Thomas Garnier
2017-05-12 17:05                         ` Thomas Garnier
2017-05-12 17:05                         ` Thomas Garnier
2017-05-09 16:30             ` [kernel-hardening] " Kees Cook
2017-05-09 16:30               ` Kees Cook
2017-05-09 16:30               ` Kees Cook
2017-05-08 12:46     ` Greg KH
2017-05-08 12:46       ` Greg KH
2017-05-08 12:46       ` Greg KH
2017-05-09  6:45       ` Ingo Molnar
2017-05-09  6:45         ` Ingo Molnar
2017-05-09  6:45         ` Ingo Molnar
2017-05-09  8:56         ` Christoph Hellwig
2017-05-09  8:56           ` Christoph Hellwig
2017-05-09  8:56           ` Christoph Hellwig
2017-05-09 13:00           ` Andy Lutomirski
2017-05-09 13:00             ` Andy Lutomirski
2017-05-09 13:00             ` Andy Lutomirski
2017-05-09 13:02             ` [kernel-hardening] " Christoph Hellwig
2017-05-09 13:02               ` Christoph Hellwig
2017-05-09 13:02               ` Christoph Hellwig
2017-05-09 16:03               ` Christoph Hellwig
2017-05-09 16:03                 ` Christoph Hellwig
2017-05-09 16:03                 ` Christoph Hellwig
2017-05-09 16:50                 ` Kees Cook
2017-05-09 16:50                   ` Kees Cook
2017-05-09 16:50                   ` Kees Cook
2017-05-09 22:52                   ` Andy Lutomirski
2017-05-09 22:52                     ` Andy Lutomirski
2017-05-09 22:52                     ` Andy Lutomirski
2017-05-09 23:31                     ` Kees Cook
2017-05-09 23:31                       ` Kees Cook
2017-05-09 23:31                       ` Kees Cook
2017-05-10  1:59                       ` Andy Lutomirski
2017-05-10  1:59                         ` Andy Lutomirski
2017-05-10  1:59                         ` Andy Lutomirski
2017-05-10  7:15                       ` Christoph Hellwig
2017-05-10  7:15                         ` Christoph Hellwig
2017-05-10  7:15                         ` Christoph Hellwig
2017-05-11 11:22                       ` Borislav Petkov
2017-05-11 11:22                         ` Borislav Petkov
2017-05-11 11:22                         ` Borislav Petkov
2017-05-10  6:46                   ` Christoph Hellwig
2017-05-10  6:46                     ` Christoph Hellwig
2017-05-10  6:46                     ` Christoph Hellwig
2017-05-10  2:11                 ` Al Viro
2017-05-10  2:11                   ` Al Viro
2017-05-10  2:11                   ` Al Viro
2017-05-10  2:45                   ` Al Viro
2017-05-10  2:45                     ` Al Viro
2017-05-10  2:45                     ` Al Viro
2017-05-10  3:12                     ` Al Viro
2017-05-10  3:12                       ` Al Viro
2017-05-10  3:12                       ` Al Viro
2017-05-10  3:21                       ` Al Viro
2017-05-10  3:21                         ` Al Viro
2017-05-10  3:21                         ` Al Viro
2017-05-10  3:39                         ` Al Viro
2017-05-10  3:39                           ` Al Viro
2017-05-10  3:39                           ` Al Viro
2017-05-10  6:54                           ` Christoph Hellwig
2017-05-10  6:54                             ` Christoph Hellwig
2017-05-10  6:54                             ` Christoph Hellwig
2017-05-10  6:53                       ` Christoph Hellwig
2017-05-10  6:53                         ` Christoph Hellwig
2017-05-10  6:53                         ` Christoph Hellwig
2017-05-10  7:27                         ` Al Viro
2017-05-10  7:27                           ` Al Viro
2017-05-10  7:27                           ` Al Viro
2017-05-10  7:35                           ` Christoph Hellwig
2017-05-10  7:35                             ` Christoph Hellwig
2017-05-10  7:35                             ` Christoph Hellwig
2017-05-10  6:49                     ` Christoph Hellwig
2017-05-10  6:49                       ` Christoph Hellwig
2017-05-10  6:49                       ` Christoph Hellwig
2017-05-10  7:28                 ` Arnd Bergmann
2017-05-10  7:28                   ` Arnd Bergmann
2017-05-10  7:28                   ` Arnd Bergmann
2017-05-10  7:35                   ` Christoph Hellwig
2017-05-10  7:35                     ` Christoph Hellwig
2017-05-10  7:35                     ` Christoph Hellwig
2017-05-09 16:05             ` Brian Gerst
2017-05-09 16:05               ` Brian Gerst
2017-05-09 16:05               ` Brian Gerst
2017-05-10  7:37             ` [kernel-hardening] " Arnd Bergmann
2017-05-10  7:37               ` Arnd Bergmann
2017-05-10  7:37               ` Arnd Bergmann
2017-05-10  8:08               ` Al Viro
2017-05-10  8:08                 ` Al Viro
2017-05-10  8:08                 ` Al Viro
2017-05-10  8:14                 ` Christoph Hellwig
2017-05-10  8:14                   ` Christoph Hellwig
2017-05-10  8:14                   ` Christoph Hellwig
2017-05-11  0:18                   ` Andy Lutomirski
2017-05-11  0:18                     ` Andy Lutomirski
2017-05-11  0:18                     ` Andy Lutomirski
2017-05-12  7:00             ` Ingo Molnar
2017-05-12  7:00               ` Ingo Molnar
2017-05-12  7:00               ` Ingo Molnar
2017-05-12  7:15               ` Al Viro
2017-05-12  7:15                 ` Al Viro
2017-05-12  7:15                 ` Al Viro
2017-05-12  7:35                 ` Christoph Hellwig
2017-05-12  7:35                   ` Christoph Hellwig
2017-05-12  7:35                   ` Christoph Hellwig
2017-05-12  8:07                   ` Christoph Hellwig
2017-05-12  8:07                     ` Christoph Hellwig
2017-05-12  8:07                     ` Christoph Hellwig
2017-05-12  8:23                     ` Greg KH
2017-05-12  8:23                       ` Greg KH
2017-05-12  8:23                       ` Greg KH
2017-05-12  7:43                 ` [kernel-hardening] " Arnd Bergmann
2017-05-12  7:43                   ` Arnd Bergmann
2017-05-12  7:43                   ` Arnd Bergmann
2017-05-12  8:11                   ` Christoph Hellwig
2017-05-12  8:11                     ` Christoph Hellwig
2017-05-12  8:11                     ` Christoph Hellwig
2017-05-12  8:16                     ` Al Viro
2017-05-12  8:16                       ` Al Viro
2017-05-12  8:16                       ` Al Viro
2017-05-12  8:11                   ` Al Viro
2017-05-12  8:11                     ` Al Viro
2017-05-12  8:11                     ` Al Viro
2017-05-12  8:20                     ` Arnd Bergmann
2017-05-12  8:20                       ` Arnd Bergmann
2017-05-12  8:20                       ` Arnd Bergmann
2017-05-12 23:20                 ` Andy Lutomirski
2017-05-12 23:20                   ` Andy Lutomirski
2017-05-12 23:20                   ` Andy Lutomirski
2017-05-08 13:09     ` Kees Cook
2017-05-08 13:09       ` Kees Cook
2017-05-08 13:09       ` Kees Cook
2017-05-08 13:09       ` Kees Cook
2017-05-08 14:02       ` [kernel-hardening] " Ingo Molnar
2017-05-08 14:02         ` Ingo Molnar
2017-05-08 14:02         ` Ingo Molnar
2017-05-08 14:02         ` Ingo Molnar
2017-05-08 14:06         ` [kernel-hardening] " Jann Horn
2017-05-08 14:06           ` Jann Horn
2017-05-08 14:06           ` Jann Horn
2017-05-08 14:06           ` Jann Horn
2017-05-08 20:48           ` [kernel-hardening] " Al Viro
2017-05-08 20:48             ` Al Viro
2017-05-08 20:48             ` Al Viro
2017-05-08 20:48             ` Al Viro
2017-05-12 23:15             ` [kernel-hardening] " Andy Lutomirski
2017-05-12 23:15               ` Andy Lutomirski
2017-05-12 23:15               ` Andy Lutomirski
2017-05-12 23:15               ` Andy Lutomirski
2017-05-08 15:24         ` [kernel-hardening] " Kees Cook
2017-05-08 15:24           ` Kees Cook
2017-05-08 15:24           ` Kees Cook
2017-05-08 15:24           ` Kees Cook
2017-05-09  6:34           ` [kernel-hardening] " Ingo Molnar
2017-05-09  6:34             ` Ingo Molnar
2017-05-09  6:34             ` Ingo Molnar
2017-05-09  6:34             ` Ingo Molnar

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