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From: Michael Ellerman <mpe@ellerman.id.au>
To: Jason Cooper <jason@lakedaemon.net>, Kees Cook <keescook@chromium.org>
Cc: "Roberts, William C" <william.c.roberts@intel.com>,
	Yann Droneaud <ydroneaud@opteya.com>,
	Linux-MM <linux-mm@kvack.org>,
	LKML <linux-kernel@vger.kernel.org>,
	"kernel-hardening@lists.openwall.com"
	<kernel-hardening@lists.openwall.com>,
	Russell King - ARM Linux <linux@arm.linux.org.uk>,
	Andrew Morton <akpm@linux-foundation.org>,
	Theodore Ts'o <tytso@mit.edu>, Arnd Bergmann <arnd@arndb.de>,
	Greg KH <gregkh@linuxfoundation.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will.deacon@arm.com>,
	Ralf Baechle <ralf@linux-mips.org>,
	"benh@kernel.crashing.org" <benh@kernel.crashing.org>,
	Paul Mackerras <paulus@samba.org>,
	"David S. Miller" <davem@davemloft.net>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
	"x86@kernel.org" <x86@kernel.org>,
	Al Viro <viro@zeniv.linux.org.uk>,
	Nick Kralevich <nnk@google.com>,
	Jeffrey Vander Stoep <jeffv@google.com>,
	Daniel Cashman <dcashman@android.com>
Subject: Re: [kernel-hardening] Re: [PATCH v2 1/7] random: Simplify API for random address requests
Date: Tue, 02 Aug 2016 13:35:13 +1000
Message-ID: <878twfonbi.fsf@concordia.ellerman.id.au> (raw)
In-Reply-To: <20160801231723.GG4541@io.lakedaemon.net>

Jason Cooper <jason@lakedaemon.net> writes:
> On Mon, Aug 01, 2016 at 12:47:59PM -0700, Kees Cook wrote:
>> On Sun, Jul 31, 2016 at 1:56 PM, Jason Cooper <jason@lakedaemon.net> wrote:
>> 
>> I have no new call sites in mind, but it seems safe to add a BUG_ON to
>> verify we don't gain callers that don't follow the correct
>> expectations. (Or maybe WARN and return start.)
>
> No, I think BUG_ON is appropriate.  afaict, the only time this will be
> encountered is during the development process.

Unless it's not.

Why crash someone's system when you could just page align the value
you're given?

cheers

  reply index

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-07-28 20:47 [kernel-hardening] [PATCH 0/7] char/random: Simplify " Jason Cooper
2016-07-28 20:47 ` [kernel-hardening] [PATCH 1/7] random: Simplify API for " Jason Cooper
2016-07-29  8:59   ` [kernel-hardening] " Yann Droneaud
2016-07-29 18:20     ` Jason Cooper
2016-07-28 20:47 ` [kernel-hardening] [PATCH 2/7] x86: Use simpler " Jason Cooper
2016-07-28 20:47 ` [kernel-hardening] [PATCH 3/7] ARM: " Jason Cooper
2016-07-28 20:47 ` [kernel-hardening] [PATCH 4/7] arm64: " Jason Cooper
2016-07-29 13:48   ` [kernel-hardening] " Will Deacon
2016-07-28 20:47 ` [kernel-hardening] [PATCH 5/7] tile: " Jason Cooper
2016-07-28 20:47 ` [kernel-hardening] [PATCH 6/7] unicore32: " Jason Cooper
2016-07-28 20:47 ` [kernel-hardening] [PATCH 7/7] random: Remove unused randomize_range() Jason Cooper
2016-07-30 15:42 ` [kernel-hardening] [PATCH v2 0/7] char/random: Simplify random address requests Jason Cooper
2016-07-30 15:42   ` [kernel-hardening] [PATCH v2 1/7] random: Simplify API for " Jason Cooper
2016-07-31 16:46     ` [kernel-hardening] " Kees Cook
2016-07-31 20:56       ` Jason Cooper
2016-08-01 19:47         ` Kees Cook
2016-08-01 23:17           ` Jason Cooper
2016-08-02  3:35             ` Michael Ellerman [this message]
2016-08-03 18:42               ` Jason Cooper
2016-07-30 15:42   ` [kernel-hardening] [PATCH v2 2/7] x86: Use simpler " Jason Cooper
2016-07-30 15:42   ` [kernel-hardening] [PATCH v2 3/7] ARM: " Jason Cooper
2016-07-30 15:42   ` [kernel-hardening] [PATCH v2 4/7] arm64: " Jason Cooper
2016-07-30 15:42   ` [kernel-hardening] [PATCH v2 5/7] tile: " Jason Cooper
2016-07-30 15:42   ` [kernel-hardening] [PATCH v2 6/7] unicore32: " Jason Cooper
2016-07-30 15:42   ` [kernel-hardening] [PATCH v2 7/7] random: Remove unused randomize_range() Jason Cooper
2016-08-03 23:39 ` [kernel-hardening] [PATCH v3 0/7] char/random: Simplify random address requests Jason Cooper
2016-08-03 23:39   ` [kernel-hardening] [PATCH v3 1/7] random: Simplify API for " Jason Cooper
2016-08-04 12:47     ` [kernel-hardening] " Yann Droneaud
2016-08-03 23:39   ` [kernel-hardening] [PATCH v3 2/7] x86: Use simpler " Jason Cooper
2016-08-03 23:39   ` [kernel-hardening] [PATCH v3 3/7] ARM: " Jason Cooper
2016-08-03 23:39   ` [kernel-hardening] [PATCH v3 4/7] arm64: " Jason Cooper
2016-08-03 23:39   ` [kernel-hardening] [PATCH v3 5/7] tile: " Jason Cooper
2016-08-03 23:39   ` [kernel-hardening] [PATCH v3 6/7] unicore32: " Jason Cooper
2016-08-03 23:39   ` [kernel-hardening] [PATCH v3 7/7] random: Remove unused randomize_range() Jason Cooper
2016-08-03 23:48     ` [kernel-hardening] " Andrew Morton
2016-08-04  0:19       ` Jason Cooper
2016-08-04  2:41   ` [kernel-hardening] Re: [PATCH v3 0/7] char/random: Simplify random address requests Kees Cook

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