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
|
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021, Andrew Kaster <akaster@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Assertions.h>
#include <AK/Format.h>
#include <AK/Types.h>
#include <LibTest/TestCase.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <sys/mman.h>
#include <unistd.h>
#define EXPECT_OK(syscall, address, size) \
do { \
rc = syscall(fd, (void*)(address), (size_t)(size)); \
EXPECT(rc >= 0); \
if (rc < 0) { \
warnln("Expected success: " #syscall "({:p}, {}), got rc={}, errno={}", (void*)(address), (size_t)(size), rc, errno); \
} \
} while (0)
#define EXPECT_EFAULT(syscall, address, size) \
do { \
rc = syscall(fd, (void*)(address), (size_t)(size)); \
EXPECT(rc < 0); \
EXPECT_EQ(errno, EFAULT); \
if (rc >= 0 || errno != EFAULT) { \
warnln("Expected EFAULT: " #syscall "({:p}, {}), got rc={}, errno={}", (void*)(address), (size_t)(size), rc, errno); \
} \
} while (0)
#define EXPECT_EFAULT_NO_FD(syscall, address, size) \
do { \
rc = syscall((address), (size_t)(size)); \
EXPECT(rc < 0); \
EXPECT_EQ(errno, EFAULT); \
if (rc >= 0 || errno != EFAULT) { \
warnln("Expected EFAULT: " #syscall "({:p}, {}), got rc={}, errno={}", (void*)(address), (size_t)(size), rc, errno); \
} \
} while (0)
TEST_CASE(test_efault)
{
int fd = open("/dev/zero", O_RDONLY);
int rc = -1;
// Test a one-page mapping (4KB)
u8* one_page = (u8*)mmap(nullptr, 4096, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, 0, 0);
VERIFY(one_page);
EXPECT_OK(read, one_page, 4096);
EXPECT_EFAULT(read, one_page, 4097);
EXPECT_EFAULT(read, one_page - 1, 4096);
// Test a two-page mapping (8KB)
u8* two_page = (u8*)mmap(nullptr, 8192, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, 0, 0);
VERIFY(two_page);
EXPECT_OK(read, two_page, 4096);
EXPECT_OK(read, two_page + 4096, 4096);
EXPECT_OK(read, two_page, 8192);
EXPECT_OK(read, two_page + 4095, 4097);
EXPECT_OK(read, two_page + 1, 8191);
EXPECT_EFAULT(read, two_page, 8193);
EXPECT_EFAULT(read, two_page - 1, 1);
// Check validation of pages between the first and last address.
ptrdiff_t distance = two_page - one_page;
EXPECT_EFAULT(read, one_page, (u32)distance + 1024);
constexpr auto user_range_ceiling = (sizeof(void*) == 4 ? 0xbe000000u : 0x1ffe000000);
u8* jerk_page = nullptr;
// Test every kernel page just because.
constexpr auto kernel_range_ceiling = (sizeof(void*) == 4 ? 0xffffffffu : 0x203fffffff);
for (u64 kernel_address = user_range_ceiling; kernel_address <= kernel_range_ceiling; kernel_address += PAGE_SIZE) {
jerk_page = (u8*)mmap((void*)kernel_address, PAGE_SIZE, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, 0, 0);
EXPECT_EQ(jerk_page, MAP_FAILED);
EXPECT_EQ(errno, EFAULT);
}
// Test the page just below where the user VM ends.
jerk_page = (u8*)mmap((void*)(user_range_ceiling - PAGE_SIZE), PAGE_SIZE, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, 0, 0);
EXPECT_EQ(jerk_page, (u8*)(user_range_ceiling - PAGE_SIZE));
EXPECT_OK(read, jerk_page, PAGE_SIZE);
EXPECT_EFAULT(read, jerk_page, PAGE_SIZE + 1);
// Test something that would wrap around the 2^32 mark.
EXPECT_EFAULT(read, jerk_page, 0x50000000);
}
|
