From: Greg KH <gre...@linuxfoundation.org>
3.5-stable review patch. If anyone has any objections, please let me know.
------------------
From: "Rafael J. Wysocki" <r...@sisk.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 <r...@sisk.pl>
Acked-by: Michael Kerrisk <mtk.man-pa...@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.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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