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prctl: adds the capable(CAP_SYS_NICE) check to PR_SET_TIMERSLACK_PID.

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Adds a capable() check to make sure that arbitary apps do not change the
timer slack for other apps.

Bug: 15000427
Change-Id: I558a2551a0e3579c7f7e7aae54b28aa9d982b209
Signed-off-by: Ruchi Kandoi <kandoiruchi@google.com>
Git-commit: 8ae872f1d59990a1f33a7e5aae6b5bcbedc5806f
Git-repo: https://android.googlesource.com/kernel/common.git
Signed-off-by: Ian Maund <imaund@codeaurora.org>
This commit is contained in:
Ruchi Kandoi 2014-06-13 17:03:01 -07:00 committed by Ian Maund
parent b9efd921d4
commit 6804b175b2
1 changed files with 3 additions and 0 deletions
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3
kernel/sys.c
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@ -2378,6 +2378,9 @@ SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3,
return -EINVAL;
break;
case PR_SET_TIMERSLACK_PID:
if (current->pid != (pid_t)arg3 &&
!capable(CAP_SYS_NICE))
return -EPERM;
rcu_read_lock();
tsk = find_task_by_pid_ns((pid_t)arg3, &init_pid_ns);
if (tsk == NULL) {