From: will.deacon@arm.com (Will Deacon)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] ARM: fix string functions on !MMU
Date: Tue, 22 Apr 2014 10:44:24 +0100 [thread overview]
Message-ID: <20140422094424.GA6979@arm.com> (raw)
In-Reply-To: <1398103808-24380-1-git-send-email-rabin@rab.in>
On Mon, Apr 21, 2014 at 07:10:08PM +0100, Rabin Vincent wrote:
> 8c56cc8be5b38e ("ARM: 7449/1: use generic strnlen_user and
> strncpy_from_user functions") apparently broken those string operations
> for !MMU. USER_DS == KERNEL_DS on !MMU, so user_addr_max() always
> restricts the addresses to TASK_SIZE.
>
> TASK_SIZE has anyway no meaning on !MMU, so make user_addr_max() not
> restrict anything.
Might be worth mentioning that this is an issue because KERNEL_DS is 0x0
(since it's a 32-bit quantity), so checks like addr < user_addr_max() will
fail. Anyway, the code looks fine to me:
Acked-by: Will Deacon <will.deacon@arm.com>
Will
next prev parent reply other threads:[~2014-04-22 9:44 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-21 18:10 [PATCH] ARM: fix string functions on !MMU Rabin Vincent
2014-04-22 9:44 ` Will Deacon [this message]
2014-04-24 15:43 ` Rabin Vincent
2014-04-25 9:12 ` Will Deacon
2014-04-25 18:45 ` Rabin Vincent
2014-04-28 19:10 ` Will Deacon
2014-04-28 7:51 ` Uwe Kleine-König
2014-06-02 16:53 ` Rabin Vincent
2014-06-03 7:51 ` Uwe Kleine-König
2014-06-03 19:47 ` Uwe Kleine-König
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