linux-kernel - [ 042/122] PM / Sleep: Require CAP_BLOCK_SUSPEND to use wake_lock/wake

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Message-Id: <20120807221951.996747839@linuxfoundation.org>
Date:	Tue,  7 Aug 2012 15:25:30 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, "Rafael J. Wysocki" <rjw@...k.pl>,
	Michael Kerrisk <mtk.man-pages@...il.com>
Subject: [ 042/122] PM / Sleep: Require CAP_BLOCK_SUSPEND to use wake_lock/wake_unlock

From: Greg KH <gregkh@...uxfoundation.org>

3.5-stable review patch.  If anyone has any objections, please let me know.

------------------

From: "Rafael J. Wysocki" <rjw@...k.pl>

commit 11388c87d2abca1f01975ced28ce9eacea239104 upstream.

Require processes wanting to use the wake_lock/wake_unlock sysfs
files to have the CAP_BLOCK_SUSPEND capability, which also is
required for the eventpoll EPOLLWAKEUP flag to be effective, so that
all interfaces related to blocking autosleep depend on the same
capability.

Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
Acked-by: Michael Kerrisk <mtk.man-pages@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 kernel/power/wakelock.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/kernel/power/wakelock.c
+++ b/kernel/power/wakelock.c
@@ -9,6 +9,7 @@
  * manipulate wakelocks on Android.
  */
 
+#include <linux/capability.h>
 #include <linux/ctype.h>
 #include <linux/device.h>
 #include <linux/err.h>
@@ -188,6 +189,9 @@ int pm_wake_lock(const char *buf)
 	size_t len;
 	int ret = 0;
 
+	if (!capable(CAP_BLOCK_SUSPEND))
+		return -EPERM;
+
 	while (*str && !isspace(*str))
 		str++;
 
@@ -231,6 +235,9 @@ int pm_wake_unlock(const char *buf)
 	size_t len;
 	int ret = 0;
 
+	if (!capable(CAP_BLOCK_SUSPEND))
+		return -EPERM;
+
 	len = strlen(buf);
 	if (!len)
 		return -EINVAL;


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