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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "sandbox/policy/linux/bpf_cros_amd_gpu_policy_linux.h"
#include <errno.h>
#include <fcntl.h>
#include <linux/kcmp.h>
#include <sys/socket.h>
// Some arch's (arm64 for instance) unistd.h don't pull in symbols used here
// unless these are defined.
#define __ARCH_WANT_SYSCALL_NO_AT
#define __ARCH_WANT_SYSCALL_DEPRECATED
#include <unistd.h>
#include "sandbox/linux/bpf_dsl/bpf_dsl.h"
#include "sandbox/linux/system_headers/linux_syscalls.h"
using sandbox::bpf_dsl::AllOf;
using sandbox::bpf_dsl::Allow;
using sandbox::bpf_dsl::Arg;
using sandbox::bpf_dsl::Error;
using sandbox::bpf_dsl::If;
using sandbox::bpf_dsl::ResultExpr;
namespace sandbox {
namespace policy {
CrosAmdGpuProcessPolicy::CrosAmdGpuProcessPolicy() {}
CrosAmdGpuProcessPolicy::~CrosAmdGpuProcessPolicy() {}
ResultExpr CrosAmdGpuProcessPolicy::EvaluateSyscall(int sysno) const {
switch (sysno) {
case __NR_sched_setaffinity:
case __NR_sched_setscheduler:
case __NR_sysinfo:
case __NR_uname:
#if !defined(__aarch64__)
case __NR_readlink:
case __NR_stat:
#endif
return Allow();
#if defined(__x86_64__)
// Allow only AF_UNIX for |domain|.
case __NR_socket:
case __NR_socketpair: {
const Arg<int> domain(0);
return If(domain == AF_UNIX, Allow()).Else(Error(EPERM));
}
#endif
case __NR_kcmp: {
const Arg<int> pid1(0);
const Arg<int> pid2(1);
const Arg<int> type(2);
const int policy_pid = GetPolicyPid();
// Only allowed when comparing file handles for the calling thread.
return If(AllOf(pid1 == policy_pid, pid2 == policy_pid,
type == KCMP_FILE),
Allow())
.Else(Error(EPERM));
}
default:
// Default to the generic GPU policy.
return GpuProcessPolicy::EvaluateSyscall(sysno);
}
}
} // namespace policy
} // namespace sandbox
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