Linux sandbox: Restrict sched_* and ioprio_* calls in the cros arm GPU policy.

sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions.h

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef SANDBOX_LINUX_SECCOMP_BPF_HELPERS_SYSCALL_PARAMETERS_RESTRICTIONS_H_
 #define SANDBOX_LINUX_SECCOMP_BPF_HELPERS_SYSCALL_PARAMETERS_RESTRICTIONS_H_
 
 #include <unistd.h>
 
 #include "build/build_config.h"
@@ skipping 45 matching lines @@
 
 // Restrict |sysno| (which must be kill, tkill or tgkill) by allowing tgkill or
 // kill iff the first parameter is |target_pid|, crashing otherwise or if
 // |sysno| is tkill.
 SANDBOX_EXPORT bpf_dsl::ResultExpr RestrictKillTarget(pid_t target_pid,
                                                       int sysno);
 
 // Crash if FUTEX_CMP_REQUEUE_PI is used in the second argument of futex(2).
 SANDBOX_EXPORT bpf_dsl::ResultExpr RestrictFutex();
 
-// Crash if |which| is not PRIO_PROCESS. EPERM if |who| is not 0, neither
+// Crash if |which| is not PRIO_PROCESS. EPERM if |who| is neither 0 nor
 // |target_pid| while calling setpriority(2) / getpriority(2).
 SANDBOX_EXPORT bpf_dsl::ResultExpr RestrictGetSetpriority(pid_t target_pid);
 
+// Crash if |which| is not PRIO_PROCESS. EPERM if |who| is neither 0 nor
+// |target_pid| while calling ioprio_set(2) / ioprio_get(2).
+SANDBOX_EXPORT bpf_dsl::ResultExpr RestrictIoPrioGetSet(pid_t target_pid);
+
 // Restrict |clk_id| for clock_getres(), clock_gettime() and clock_settime().
 // We allow accessing only CLOCK_MONOTONIC, CLOCK_PROCESS_CPUTIME_ID,
 // CLOCK_REALTIME, and CLOCK_THREAD_CPUTIME_ID.  In particular, this disallows
 // access to arbitrary per-{process,thread} CPU-time clock IDs (such as those
 // returned by {clock,pthread}_getcpuclockid), which can leak information
 // about the state of the host OS.
 // On Chrome OS, base::TimeTicks::kClockSystemTrace is also allowed.
 SANDBOX_EXPORT bpf_dsl::ResultExpr RestrictClockID();
 
 // Restricts |pid| for sched_* syscalls which take a pid as the first argument.
 // We only allow calling these syscalls if the pid argument is equal to the pid
 // of the sandboxed process or 0 (indicating the current thread).  The following
 // syscalls are supported:
 //
 // sched_getaffinity(), sched_getattr(), sched_getparam(), sched_getscheduler(),
 // sched_rr_get_interval(), sched_setaffinity(), sched_setattr(),
 // sched_setparam(), sched_setscheduler()
 SANDBOX_EXPORT bpf_dsl::ResultExpr RestrictSchedTarget(pid_t target_pid,
                                                        int sysno);
 
 }  // namespace sandbox.
 
 #endif  // SANDBOX_LINUX_SECCOMP_BPF_HELPERS_SYSCALL_PARAMETERS_RESTRICTIONS_H_