forked from WebKit/WebKit
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathIntegrityInlines.h
More file actions
87 lines (75 loc) · 3.13 KB
/
IntegrityInlines.h
File metadata and controls
87 lines (75 loc) · 3.13 KB
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
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
/*
* Copyright (C) 2019-2020 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "Integrity.h"
#include "VM.h"
namespace JSC {
namespace Integrity {
ALWAYS_INLINE bool Random::shouldAudit(VM& vm)
{
// If auditing is enabled, then the top bit of m_triggerBits is always set
// to 1 on reload. When this top bit reaches the bottom, it does not
// indicate that we should trigger an audit but rather that we've shifted
// out all the available trigger bits and hence, need to reload. Instead,
// reloadAndCheckShouldAuditSlow() will return whether we actually need to
// trigger an audit this turn.
//
// This function can be called concurrently from different threads and can
// be racy. For that reason, we intentionally do not write back to
// m_triggerBits if newTriggerBits is null. This ensures that if
// Options::randomIntegrityAuditRate() is non-zero, then m_triggerBits will
// always have at least 1 bit to trigger a reload.
uint64_t newTriggerBits = m_triggerBits;
bool shouldAudit = newTriggerBits & 1;
newTriggerBits = newTriggerBits >> 1;
if (LIKELY(!shouldAudit)) {
m_triggerBits = newTriggerBits;
return false;
}
if (!newTriggerBits)
return reloadAndCheckShouldAuditSlow(vm);
m_triggerBits = newTriggerBits;
return true;
}
ALWAYS_INLINE void auditCellMinimally(VM& vm, JSCell* cell)
{
if (UNLIKELY(Gigacage::contains(cell)))
auditCellMinimallySlow(vm, cell);
}
ALWAYS_INLINE void auditCellRandomly(VM& vm, JSCell* cell)
{
if (UNLIKELY(vm.integrityRandom().shouldAudit(vm)))
auditCellFully(vm, cell);
}
ALWAYS_INLINE void auditStructureID(StructureIDTable& table, StructureID id)
{
table.validate(id);
}
ALWAYS_INLINE void auditStructureID(VM& vm, StructureID id)
{
auditStructureID(vm.heap.structureIDTable(), id);
}
} // namespace Integrity
} // namespace JSC