From: Wu Fengguang <fengguang.wu@intel.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Wu Fengguang <fengguang.wu@intel.com>,
LKML <linux-kernel@vger.kernel.org>, Kelly Bowa <kmb@tuxedu.org>,
Andi Kleen <andi@firstfloor.org>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Christoph Lameter <cl@linux-foundation.org>,
Ingo Molnar <mingo@elte.hu>, Tejun Heo <tj@kernel.org>,
Nick Piggin <npiggin@suse.de>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
stable@kernel.org, Hugh Dickins <hugh.dickins@tiscali.co.uk>,
Linux Memory Management List <linux-mm@kvack.org>
Subject: [PATCH 3/8] devmem: fix kmem write bug on memory holes
Date: Wed, 13 Jan 2010 21:53:08 +0800 [thread overview]
Message-ID: <20100113135957.545276953@intel.com> (raw)
In-Reply-To: <20100113135305.013124116@intel.com>
[-- Attachment #1: vwrite-fix.patch --]
[-- Type: text/plain, Size: 1330 bytes --]
write_kmem() used to assume vwrite() always return the full buffer length.
However now vwrite() could return 0 to indicate memory hole. This creates
a bug that "buf" is not advanced accordingly.
Fix it to simply ignore the return value, hence the memory hole.
CC: Kelly Bowa <kmb@tuxedu.org>
CC: Andi Kleen <andi@firstfloor.org>
CC: Benjamin Herrenschmidt <benh@kernel.crashing.org>
CC: Christoph Lameter <cl@linux-foundation.org>
CC: Ingo Molnar <mingo@elte.hu>
CC: Tejun Heo <tj@kernel.org>
CC: Nick Piggin <npiggin@suse.de>
CC: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
CC: <stable@kernel.org>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
---
drivers/char/mem.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- linux-mm.orig/drivers/char/mem.c 2010-01-11 10:32:32.000000000 +0800
+++ linux-mm/drivers/char/mem.c 2010-01-11 10:32:34.000000000 +0800
@@ -555,7 +555,7 @@ static ssize_t write_kmem(struct file *
err = -EFAULT;
break;
}
- sz = vwrite(kbuf, (char *)p, sz);
+ vwrite(kbuf, (char *)p, sz);
count -= sz;
buf += sz;
virtr += sz;
--
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next prev parent reply other threads:[~2010-01-13 14:00 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-13 13:53 [PATCH 0/8] devmem/kmem/kcore fixes, cleanups and hwpoison checks Wu Fengguang
2010-01-13 13:53 ` [PATCH 1/8] vfs: fix too big f_pos handling Wu Fengguang
2010-01-13 13:53 ` [PATCH 2/8] devmem: check vmalloc address on kmem read/write Wu Fengguang
2010-01-13 13:53 ` Wu Fengguang [this message]
2010-01-13 13:53 ` [PATCH 4/8] resources: introduce generic page_is_ram() Wu Fengguang
2010-01-13 14:29 ` Américo Wang
2010-01-14 3:29 ` Wu Fengguang
2010-01-13 13:53 ` [PATCH 5/8] vmalloc: simplify vread()/vwrite() Wu Fengguang
2010-01-14 12:45 ` Nick Piggin
2010-01-18 13:35 ` Wu Fengguang
2010-01-18 14:23 ` Nick Piggin
2010-01-19 1:33 ` Wu Fengguang
2010-01-19 2:23 ` KAMEZAWA Hiroyuki
2010-01-21 5:05 ` Wu Fengguang
2010-01-21 5:21 ` KAMEZAWA Hiroyuki
2010-01-21 5:49 ` Wu Fengguang
2010-01-13 13:53 ` [PATCH 6/8] hwpoison: prevent /dev/kmem from accessing hwpoison pages Wu Fengguang
2010-01-13 13:53 ` [PATCH 7/8] hwpoison: prevent /dev/mem " Wu Fengguang
2010-01-13 13:53 ` [PATCH 8/8] hwpoison: prevent /dev/kcore " Wu Fengguang
2010-01-13 14:23 ` Américo Wang
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