From: Bryan Kadzban <bryan@kadzban.is-a-geek.net>
Date: Tue, 16 Oct 2007 08:28:23 +0000 (-0700)
Subject: rtc: allow validated RTC_PIE_ON for non-root
X-Git-Tag: firefly_0821_release~25577
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=9d013d3b14f4c81bdfe6c81fc506037d60007036;p=firefly-linux-kernel-4.4.55.git

rtc: allow validated RTC_PIE_ON for non-root

drivers/char/rtc.c allowed RTC_PIE_ON ioctls for non-root users, as long as
the current interval (set via RTC_IRQP_SET) is <= max_user_freq.  Allow
RTC_PIE_ON under the same conditions when /dev/rtc* is handled by the rtc
subsystem.

Signed-off-by: Bryan Kadzban <bryan@kdzbn.homelinux.net>
Acked-by: Alessandro Zummo <alessandro.zummo@towertech.it>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/drivers/rtc/rtc-dev.c b/drivers/rtc/rtc-dev.c
index 87d4add6b7f6..814583bd2fe7 100644
--- a/drivers/rtc/rtc-dev.c
+++ b/drivers/rtc/rtc-dev.c
@@ -233,7 +233,8 @@ static int rtc_dev_ioctl(struct inode *inode, struct file *file,
 		break;
 
 	case RTC_PIE_ON:
-		if (!capable(CAP_SYS_RESOURCE))
+		if (rtc->irq_freq > rtc->max_user_freq &&
+				!capable(CAP_SYS_RESOURCE))
 			return -EACCES;
 		break;
 	}