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
|
// Copyright 2024 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_on_device_translation_policy_linux.h"
#include <sys/mman.h>
#include "sandbox/linux/bpf_dsl/bpf_dsl.h"
#include "sandbox/linux/seccomp-bpf-helpers/sigsys_handlers.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;
namespace sandbox::policy {
namespace {
static constexpr int kMEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED_RSEQ = (1 << 8);
}
ResultExpr OnDeviceTranslationProcessPolicy::EvaluateSyscall(
int system_call_number) const {
switch (system_call_number) {
case __NR_membarrier: {
// `membarrier` is used at http://shortn/_d034oISVml (Google-internal).
const Arg<int> cmd(0);
return If(cmd == kMEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED_RSEQ, Allow())
.Else(sandbox::CrashSIGSYS());
}
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 sandbox::policy
|
