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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_SandboxInfo_h
#define mozilla_SandboxInfo_h
#include "mozilla/Types.h"
// Information on what parts of sandboxing are enabled in this build
// and/or supported by the system.
namespace mozilla {
class SandboxInfo {
public:
// No need to prevent copying; this is essentially just a const int.
SandboxInfo(const SandboxInfo& aOther) : mFlags(aOther.mFlags) { }
// Flags are checked at initializer time; this returns them.
static const SandboxInfo& Get() { return sSingleton; }
enum Flags {
// System call filtering; kernel config option CONFIG_SECCOMP_FILTER.
kHasSeccompBPF = 1 << 0,
// Config flag MOZ_CONTENT_SANDBOX; env var MOZ_DISABLE_CONTENT_SANDBOX.
kEnabledForContent = 1 << 1,
// Config flag MOZ_GMP_SANDBOX; env var MOZ_DISABLE_GMP_SANDBOX.
kEnabledForMedia = 1 << 2,
// Env var MOZ_SANDBOX_VERBOSE.
kVerbose = 1 << 3,
// Kernel can atomically set system call filtering on entire thread group.
kHasSeccompTSync = 1 << 4,
// Can this process create user namespaces? (Man page user_namespaces(7).)
kHasUserNamespaces = 1 << 5,
// Could a more privileged process have user namespaces, even if we can't?
kHasPrivilegedUserNamespaces = 1 << 6,
// Env var MOZ_PERMISSIVE_CONTENT_SANDBOX
kPermissive = 1 << 7,
// Something is creating threads when we need to still be single-threaded.
kUnexpectedThreads = 1 << 8,
};
bool Test(Flags aFlag) const { return (mFlags & aFlag) == aFlag; }
// Returns true if SetContentProcessSandbox may be called.
bool CanSandboxContent() const
{
return !Test(kEnabledForContent) || Test(kHasSeccompBPF);
}
// Returns true if SetMediaPluginSandbox may be called.
bool CanSandboxMedia() const
{
return !Test(kEnabledForMedia) || Test(kHasSeccompBPF);
}
// For telemetry / crash annotation uses.
uint32_t AsInteger() const {
return mFlags;
}
// For bug 1222500 or anything else like it: On desktop, this is
// called in the parent process at a point when it should still be
// single-threaded, to check that the SandboxEarlyInit() call in a
// child process is early enough to be single-threaded. If not,
// kUnexpectedThreads is set and affected flags (user namespaces;
// possibly others in the future) are cleared.
static MOZ_EXPORT void ThreadingCheck();
private:
enum Flags mFlags;
// This should be const, but has to allow for ThreadingCheck.
static MOZ_EXPORT SandboxInfo sSingleton;
SandboxInfo();
};
} // namespace mozilla
#endif // mozilla_SandboxInfo_h
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