1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
|
// Copyright 2020 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_speech_recognition_policy_linux.h"
#include <sys/mman.h>
#include "sandbox/linux/bpf_dsl/bpf_dsl.h"
#include "sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions.h"
#include "sandbox/linux/syscall_broker/broker_process.h"
#include "sandbox/linux/system_headers/linux_prctl.h"
#include "sandbox/linux/system_headers/linux_syscalls.h"
#include "sandbox/policy/linux/sandbox_linux.h"
using sandbox::bpf_dsl::Allow;
using sandbox::bpf_dsl::Arg;
using sandbox::bpf_dsl::If;
using sandbox::bpf_dsl::ResultExpr;
using sandbox::bpf_dsl::Trap;
using sandbox::syscall_broker::BrokerProcess;
namespace sandbox {
namespace policy {
SpeechRecognitionProcessPolicy::SpeechRecognitionProcessPolicy() = default;
SpeechRecognitionProcessPolicy::~SpeechRecognitionProcessPolicy() = default;
ResultExpr SpeechRecognitionProcessPolicy::EvaluateSyscall(
int system_call_number) const {
switch (system_call_number) {
#if defined(__NR_mmap)
case __NR_mmap: {
// The speech recognition sandbox requires the MAP_POPULATE flag in
// addition to the default flags.
const uint64_t kAllowedMask = MAP_POPULATE;
const bpf_dsl::Arg<int> flags(3);
return (flags & ~kAllowedMask) == 0
? Allow()
: BPFBasePolicy::EvaluateSyscall(system_call_number);
}
#endif
// Required by the Speech On-Device API (SODA) binary to find the
// appropriate configuration file to use within a language pack directory.
#if defined(__NR_getdents64)
case __NR_getdents64:
return Allow();
#endif
#if defined(__NR_getdents)
case __NR_getdents:
return Allow();
#endif
#if defined(__NR_prctl)
case __NR_prctl: {
const Arg<int> option(0);
return If(option == PR_CAPBSET_READ, Allow())
.Else(BPFBasePolicy::EvaluateSyscall(system_call_number));
}
#endif
default:
auto* sandbox_linux = SandboxLinux::GetInstance();
if (sandbox_linux->ShouldBrokerHandleSyscall(system_call_number))
return sandbox_linux->HandleViaBroker(system_call_number);
// Default on the content baseline policy.
return BPFBasePolicy::EvaluateSyscall(system_call_number);
}
}
} // namespace policy
} // namespace sandbox
|
