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1 // Copyright 2013 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 
5 #include "content/common/sandbox_linux/bpf_renderer_policy_linux.h"
6 
7 #include <errno.h>
8 
9 #include "base/basictypes.h"
10 #include "build/build_config.h"
11 #include "content/common/sandbox_linux/sandbox_linux.h"
12 #include "sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions.h"
13 #include "sandbox/linux/seccomp-bpf-helpers/syscall_sets.h"
14 #include "sandbox/linux/seccomp-bpf/sandbox_bpf_policy.h"
15 #include "sandbox/linux/services/linux_syscalls.h"
16 
17 using sandbox::SyscallSets;
18 
19 namespace content {
20 
RendererProcessPolicy()21 RendererProcessPolicy::RendererProcessPolicy() {}
~RendererProcessPolicy()22 RendererProcessPolicy::~RendererProcessPolicy() {}
23 
EvaluateSyscall(SandboxBPF * sandbox,int sysno) const24 ErrorCode RendererProcessPolicy::EvaluateSyscall(SandboxBPF* sandbox,
25                                                  int sysno) const {
26   switch (sysno) {
27     case __NR_ioctl:
28       return sandbox::RestrictIoctl(sandbox);
29     // Allow the system calls below.
30     // The baseline policy allows __NR_clock_gettime. Allow
31     // clock_getres() for V8. crbug.com/329053.
32     case __NR_clock_getres:
33     case __NR_fdatasync:
34     case __NR_fsync:
35     case __NR_getpriority:
36 #if defined(__i386__) || defined(__x86_64__)
37     case __NR_getrlimit:
38 #endif
39 #if defined(__i386__) || defined(__arm__)
40     case __NR_ugetrlimit:
41 #endif
42     case __NR_mremap:  // See crbug.com/149834.
43     case __NR_pread64:
44     case __NR_pwrite64:
45     case __NR_sched_getaffinity:
46     case __NR_sched_get_priority_max:
47     case __NR_sched_get_priority_min:
48     case __NR_sched_getparam:
49     case __NR_sched_getscheduler:
50     case __NR_sched_setscheduler:
51     case __NR_setpriority:
52     case __NR_sysinfo:
53     case __NR_times:
54     case __NR_uname:
55       return ErrorCode(ErrorCode::ERR_ALLOWED);
56     case __NR_prlimit64:
57       return ErrorCode(EPERM);  // See crbug.com/160157.
58     default:
59       // Default on the content baseline policy.
60       return SandboxBPFBasePolicy::EvaluateSyscall(sandbox, sysno);
61   }
62 }
63 
64 }  // namespace content
65