From: james.morse@arm.com (James Morse)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 0/5] arm64: kernel: Add support for User Access Override
Date: Mon, 07 Mar 2016 17:40:23 +0000 [thread overview]
Message-ID: <56DDBD07.2080200@arm.com> (raw)
In-Reply-To: <20160307172334.GJ19428@n2100.arm.linux.org.uk>
On 07/03/16 17:23, Russell King - ARM Linux wrote:
> On Mon, Mar 07, 2016 at 04:43:19PM +0000, James Morse wrote:
>> As far as I can see, this would only affect arm64. I can't find an equivalent
>> memset() for x86_64.
>
> I don't think you've looked hard enough. :)
Heh, Thanks! I ignored the 32bit code and instead got lost in the maze of
underscores and alternative-strings for the 64 bit path.
Having seen that path, I've now found:
> /* If the destination is a kernel buffer, we always clear the end */
> if (!__addr_ok(to))
> memset(to, 0, len);
in arch/x86/lib/usercopy_64.c:copy_user_handle_tail(), which may be the x86_64
equivalent, or I may be lost in the maze again.
Thanks!
James
next prev parent reply other threads:[~2016-03-07 17:40 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-05 14:58 [PATCH v2 0/5] arm64: kernel: Add support for User Access Override James Morse
2016-02-05 14:58 ` [PATCH v2 1/5] arm64: cpufeature: Change read_cpuid() to use sysreg's mrs_s macro James Morse
2016-02-05 14:58 ` [PATCH v2 2/5] arm64: add ARMv8.2 id_aa64mmfr2 boiler plate James Morse
2016-03-03 17:59 ` Christopher Covington
2016-03-03 18:27 ` Robin Murphy
2016-03-03 19:03 ` Christopher Covington
2016-03-03 19:19 ` Will Deacon
2016-03-04 10:20 ` Suzuki K. Poulose
2016-03-04 13:37 ` James Morse
2016-03-04 13:54 ` Robin Murphy
2016-03-04 14:59 ` Mark Rutland
2016-03-04 18:15 ` Christopher Covington
2016-02-05 14:58 ` [PATCH v2 3/5] arm64: kernel: Add support for User Access Override James Morse
2016-02-18 12:26 ` Catalin Marinas
2016-02-05 14:58 ` [PATCH v2 4/5] arm64: cpufeature: Test 'matches' pointer to find the end of the list James Morse
2016-02-05 14:58 ` [PATCH v2 5/5] arm64: kernel: Don't toggle PAN on systems with UAO James Morse
2016-02-18 14:36 ` Catalin Marinas
2016-02-18 14:43 ` James Morse
2016-02-05 15:40 ` [PATCH v2 0/5] arm64: kernel: Add support for User Access Override Arnd Bergmann
2016-02-09 9:47 ` Will Deacon
2016-02-18 18:03 ` Catalin Marinas
2016-02-19 15:38 ` Peter Maydell
2016-02-19 16:46 ` Catalin Marinas
2016-02-19 16:54 ` Peter Maydell
2016-02-19 16:57 ` Ard Biesheuvel
2016-02-19 17:03 ` Peter Maydell
2016-03-07 16:43 ` James Morse
2016-03-07 17:23 ` Russell King - ARM Linux
2016-03-07 17:40 ` James Morse [this message]
2016-03-07 17:51 ` Russell King - ARM Linux
2016-03-07 17:38 ` Catalin Marinas
2016-03-07 20:54 ` Kees Cook
2016-03-08 17:19 ` Catalin Marinas
2016-03-08 17:39 ` Kees Cook
2016-03-08 18:22 ` Catalin Marinas
2016-03-08 18:27 ` Kees Cook
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