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[PATCH] rtc subsystem: add capability checks

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Centralize CAP_SYS_XXX checks to avoid duplicate code and missing checks in
the drivers.

Signed-off-by: Alessandro Zummo <a.zummo@towertech.it>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Alessandro Zummo
2006-06-25 05:48:20 -07:00
committed by Linus Torvalds
parent 56f10c634e
commit 110d693d58
5 changed files with 24 additions and 19 deletions
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29
drivers/rtc/rtc-dev.c
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@@ -214,6 +214,28 @@ static int rtc_dev_ioctl(struct inode *inode, struct file *file,
struct rtc_wkalrm alarm;
void __user *uarg = (void __user *) arg;
/* check that the calles has appropriate permissions
* for certain ioctls. doing this check here is useful
* to avoid duplicate code in each driver.
*/
switch (cmd) {
case RTC_EPOCH_SET:
case RTC_SET_TIME:
if (!capable(CAP_SYS_TIME))
return -EACCES;
break;
case RTC_IRQP_SET:
if (arg > rtc->max_user_freq && !capable(CAP_SYS_RESOURCE))
return -EACCES;
break;
case RTC_PIE_ON:
if (!capable(CAP_SYS_RESOURCE))
return -EACCES;
break;
}
/* avoid conflicting IRQ users */
if (cmd == RTC_PIE_ON || cmd == RTC_PIE_OFF || cmd == RTC_IRQP_SET) {
spin_lock(&rtc->irq_task_lock);
@@ -272,9 +294,6 @@ static int rtc_dev_ioctl(struct inode *inode, struct file *file,
break;
case RTC_SET_TIME:
if (!capable(CAP_SYS_TIME))
return -EACCES;
if (copy_from_user(&tm, uarg, sizeof(tm)))
return -EFAULT;
@@ -290,10 +309,6 @@ static int rtc_dev_ioctl(struct inode *inode, struct file *file,
err = -EINVAL;
break;
}
if (!capable(CAP_SYS_TIME)) {
err = -EACCES;
break;
}
rtc_epoch = arg;
err = 0;
#endif