From: Clemens Ladisch <clemens@ladisch.de>
To: linux-kernel@vger.kernel.org
Cc: akpm@osdl.org, Bob Picco <bob.picco@hp.com>,
Clemens Ladisch <clemens@ladisch.de>
Subject: [PATCH 2/7] HPET: fix HPET_INFO calls from kernel space
Date: Tue, 04 Oct 2005 14:41:38 +0200 (MEST) [thread overview]
Message-ID: <20051004124137.23057.91786.schnuffi@turing> (raw)
In-Reply-To: <20051004124126.23057.75614.schnuffi@turing>
From: Clemens Ladisch <clemens@ladisch.de>
Fix a wrong memory access in hpet_ioctl_common(). It was not possible
to use the HPET_INFO ioctl from kernel space because it always called
copy_to_user().
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Index: linux-2.6.13/drivers/char/hpet.c
===================================================================
--- linux-2.6.13.orig/drivers/char/hpet.c 2005-10-03 22:53:09.000000000 +0200
+++ linux-2.6.13/drivers/char/hpet.c 2005-10-03 22:53:12.000000000 +0200
@@ -500,8 +500,12 @@ hpet_ioctl_common(struct hpet_dev *devp,
readq(&timer->hpet_config) & Tn_PER_INT_CAP_MASK;
info.hi_hpet = devp->hd_hpets->hp_which;
info.hi_timer = devp - devp->hd_hpets->hp_dev;
- if (copy_to_user((void __user *)arg, &info, sizeof(info)))
- err = -EFAULT;
+ if (kernel)
+ memcpy((void *)arg, &info, sizeof(info));
+ else
+ if (copy_to_user((void __user *)arg, &info,
+ sizeof(info)))
+ err = -EFAULT;
break;
}
case HPET_EPI:
next prev parent reply other threads:[~2005-10-04 12:44 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-10-04 12:41 [PATCH 0/7] more HPET fixes and enhancements Clemens Ladisch
2005-10-04 12:41 ` [PATCH 1/7] HPET: Fix mmap() of /dev/hpet Clemens Ladisch
2005-10-04 12:41 ` Clemens Ladisch [this message]
2005-10-04 12:41 ` [PATCH 3/7] HPET: fix division by zero in HPET_INFO Clemens Ladisch
2005-10-04 12:41 ` [PATCH 4/7] HPET: fix uninitialized variable in hpet_register() Clemens Ladisch
2005-10-04 12:41 ` [PATCH 5/7] HPET: fix access to multiple HPET devices Clemens Ladisch
2005-10-04 12:41 ` [PATCH 6/7] HPET: remove superfluous indirections Clemens Ladisch
2005-10-04 12:42 ` [PATCH 7/7] HPET: simplify initialization message Clemens Ladisch
2005-10-10 14:17 ` [PATCH 0/7] more HPET fixes and enhancements Bob Picco
2005-10-15 2:30 ` Randy.Dunlap
2005-10-17 16:30 ` Clemens Ladisch
2005-10-18 9:19 ` Takashi Iwai
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