blob: 67c1301d604d86113c5ba2e865fdea7f72d5eb58 [file] [log] [blame]
// Copyright 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.
#include "content/common/sandbox_linux/bpf_renderer_policy_linux.h"
#include <errno.h>
#include <sys/ioctl.h>
#include "build/build_config.h"
#include "content/common/sandbox_linux/sandbox_linux.h"
#include "sandbox/linux/bpf_dsl/bpf_dsl.h"
#include "sandbox/linux/seccomp-bpf-helpers/sigsys_handlers.h"
#include "sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions.h"
#include "sandbox/linux/seccomp-bpf-helpers/syscall_sets.h"
#include "sandbox/linux/system_headers/linux_syscalls.h"
#if defined(OS_CHROMEOS)
// TODO(vignatti): replace the local definitions below with #include
// <linux/dma-buf.h> once kernel version 4.6 becomes widely used.
#include <linux/types.h>
struct local_dma_buf_sync {
__u64 flags;
};
#define LOCAL_DMA_BUF_BASE 'b'
#define LOCAL_DMA_BUF_IOCTL_SYNC \
_IOW(LOCAL_DMA_BUF_BASE, 0, struct local_dma_buf_sync)
#endif
using sandbox::SyscallSets;
using sandbox::bpf_dsl::Allow;
using sandbox::bpf_dsl::Arg;
using sandbox::bpf_dsl::Error;
using sandbox::bpf_dsl::ResultExpr;
namespace content {
namespace {
ResultExpr RestrictIoctl() {
const Arg<unsigned long> request(1);
return Switch(request)
.SANDBOX_BPF_DSL_CASES((static_cast<unsigned long>(TCGETS), FIONREAD),
Allow())
#if defined(OS_CHROMEOS)
.SANDBOX_BPF_DSL_CASES(
(static_cast<unsigned long>(LOCAL_DMA_BUF_IOCTL_SYNC)), Allow())
#endif
.Default(sandbox::CrashSIGSYSIoctl());
}
} // namespace
RendererProcessPolicy::RendererProcessPolicy() {}
RendererProcessPolicy::~RendererProcessPolicy() {}
ResultExpr RendererProcessPolicy::EvaluateSyscall(int sysno) const {
switch (sysno) {
// The baseline policy allows __NR_clock_gettime. Allow
// clock_getres() for V8. crbug.com/329053.
case __NR_clock_getres:
return sandbox::RestrictClockID();
case __NR_ioctl:
return RestrictIoctl();
// Allow the system calls below.
case __NR_fdatasync:
case __NR_fsync:
#if defined(__i386__) || defined(__x86_64__) || defined(__mips__) || \
defined(__aarch64__)
case __NR_getrlimit:
#endif
#if defined(__i386__) || defined(__arm__)
case __NR_ugetrlimit:
#endif
case __NR_mremap: // See crbug.com/149834.
case __NR_pread64:
case __NR_pwrite64:
case __NR_sched_get_priority_max:
case __NR_sched_get_priority_min:
case __NR_sysinfo:
case __NR_times:
case __NR_uname:
return Allow();
case __NR_sched_getaffinity:
case __NR_sched_getparam:
case __NR_sched_getscheduler:
case __NR_sched_setscheduler:
return sandbox::RestrictSchedTarget(GetPolicyPid(), sysno);
case __NR_prlimit64:
// See crbug.com/662450.
return sandbox::RestrictPrlimitToGetrlimit(GetPolicyPid());
default:
// Default on the content baseline policy.
return SandboxBPFBasePolicy::EvaluateSyscall(sysno);
}
}
} // namespace content