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
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
|
/*
* Copyright (C) 2017-2023 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. AND ITS CONTRIBUTORS ``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 ITS 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.
*/
#include "config.h"
#include <type_traits>
#include <wtf/DataLog.h>
#include <wtf/Threading.h>
#include <wtf/WTFConfig.h>
#if OS(UNIX)
#include <signal.h>
#else
#include <wtf/Gigacage.h>
#include <wtf/OSAllocator.h>
#endif
#if OS(UNIX)
class ReflectedThread : public Thread {
public:
using Thread::m_mutex;
using Thread::m_handle;
using Thread::hasExited;
};
TEST(Signals, SignalsWorkOnExit)
{
static bool handlerRan = false;
addSignalHandler(Signal::Usr, [] (Signal signal, SigInfo&, PlatformRegisters&) -> SignalAction {
RELEASE_ASSERT(signal == Signal::Usr);
handlerRan = true;
return SignalAction::Handled;
});
activateSignalHandlersFor(Signal::Usr);
WTF::Config::finalize();
Atomic<bool> receiverShouldKeepRunning(true);
Ref<Thread> receiverThread = (Thread::create("ThreadMessage receiver"_s,
[&receiverShouldKeepRunning] () {
while (receiverShouldKeepRunning.load()) { }
}));
bool signalFired;
{
std::unique_lock<WordLock> locker(static_cast<ReflectedThread&>(receiverThread.get()).m_mutex);
receiverShouldKeepRunning.store(false);
EXPECT_FALSE(static_cast<ReflectedThread&>(receiverThread.get()).hasExited());
sleep(1_s);
signalFired = !pthread_kill(static_cast<ReflectedThread&>(receiverThread.get()).m_handle, SIGUSR2);
}
receiverThread->waitForCompletion();
EXPECT_TRUE(handlerRan || !signalFired);
}
#else
TEST(Signals, SignalsAccessFault)
{
static bool handlerRan = false;
addSignalHandler(Signal::AccessFault, [] (Signal signal, SigInfo& sigInfo, PlatformRegisters& context) -> SignalAction {
RELEASE_ASSERT(signal == Signal::AccessFault);
handlerRan = true;
#if CPU(ARM)
context.Pc += 2;
#elif CPU(X86)
context.Eip += 3;
#elif CPU(X86_64)
context.Rip += 3;
#else
#error Unsupported CPU
#endif
return SignalAction::Handled;
});
activateSignalHandlersFor(Signal::AccessFault);
WTF::Config::finalize();
// Allocate a page of memory
char* ptr = std::bit_cast<char*>(Gigacage::tryAllocateZeroedVirtualPages(Gigacage::Primitive, 4096));
// Protect that page - 4096 bytes, not readable or writeable
OSAllocator::protect(ptr, 4096, false, false);
// Try and read, triggering an AccessFault
dataLogLn("Reading from protected memory", static_cast<unsigned>(ptr[0]));
EXPECT_TRUE(handlerRan);
}
#endif
|
