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authorRafael J. Wysocki <rjw@sisk.pl>2012-07-19 00:00:58 +0200
committerRafael J. Wysocki <rjw@sisk.pl>2012-07-19 00:00:58 +0200
commit11388c87d2abca1f01975ced28ce9eacea239104 (patch)
tree60e338e5ab817de96a461b08892e0663a316d67c /kernel
parent823d93640927d739f7c918b73fe5ec494fb27e17 (diff)
PM / Sleep: Require CAP_BLOCK_SUSPEND to use wake_lock/wake_unlock
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@sisk.pl> Cc: stable@vger.kernel.org Acked-by: Michael Kerrisk <mtk.man-pages@gmail.com>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/power/wakelock.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/kernel/power/wakelock.c b/kernel/power/wakelock.c
index c8fba3380076..8f50de394d22 100644
--- 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;