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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>
This commit is contained in:
Rafael J. Wysocki 2012-07-19 00:00:58 +02:00
parent 823d936409
commit 11388c87d2
1 changed files with 7 additions and 0 deletions
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7
kernel/power/wakelock.c
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@ -9,6 +9,7 @@
* manipulate wakelocks on Android. * manipulate wakelocks on Android.
*/ */
#include <linux/capability.h>
#include <linux/ctype.h> #include <linux/ctype.h>
#include <linux/device.h> #include <linux/device.h>
#include <linux/err.h> #include <linux/err.h>
@ -188,6 +189,9 @@ int pm_wake_lock(const char *buf)
size_t len; size_t len;
int ret = 0; int ret = 0;
if (!capable(CAP_BLOCK_SUSPEND))
return -EPERM;
while (*str && !isspace(*str)) while (*str && !isspace(*str))
str++; str++;
@ -231,6 +235,9 @@ int pm_wake_unlock(const char *buf)
size_t len; size_t len;
int ret = 0; int ret = 0;
if (!capable(CAP_BLOCK_SUSPEND))
return -EPERM;
len = strlen(buf); len = strlen(buf);
if (!len) if (!len)
return -EINVAL; return -EINVAL;