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
|
// RUN: %clangxx -fsanitize=realtime %s -o %t
// RUN: %env_rtsan_opts="halt_on_error=false" %run %t 2>&1 | FileCheck %s --check-prefixes=CHECK-RTSAN,CHECK
// RUN: %clangxx %s -o %t
// RUN: %run %t 2>&1 | FileCheck %s
// UNSUPPORTED: ios
// Intent: Ensure the `syscall` call behaves in the same way with/without the
// sanitizer disabled
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <unistd.h>
const char *GetTemporaryFilePath() { return "/tmp/rtsan_syscall_test.txt"; }
void custom_assert(bool condition, const char *message) {
if (!condition) {
fprintf(stderr, "ASSERTION FAILED: %s\n", message);
exit(1);
}
}
class ScopedFileCleanup {
public:
[[nodiscard]] ScopedFileCleanup() = default;
~ScopedFileCleanup() {
if (access(GetTemporaryFilePath(), F_OK) != -1)
unlink(GetTemporaryFilePath());
}
};
// Apple has deprecated `syscall`, ignore that error
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
int main() [[clang::nonblocking]] {
ScopedFileCleanup cleanup;
{
int fd = syscall(SYS_openat, AT_FDCWD, GetTemporaryFilePath(),
O_CREAT | O_WRONLY, 0644);
custom_assert(fd != -1, "Failed to open file - write");
int written = syscall(SYS_write, fd, "Hello, world!", 13);
custom_assert(written == 13, "Failed to write to file");
custom_assert(syscall(SYS_close, fd) == 0, "Failed to close file - write");
}
{
int fd = syscall(SYS_openat, AT_FDCWD, GetTemporaryFilePath(), O_RDONLY);
custom_assert(fd != -1, "Failed to open file - read");
char buffer[13];
int read = syscall(SYS_read, fd, buffer, 13);
custom_assert(read == 13, "Failed to read from file");
custom_assert(memcmp(buffer, "Hello, world!", 13) == 0,
"Read data does not match written data");
custom_assert(syscall(SYS_close, fd) == 0, "Failed to close file - read");
}
unlink(GetTemporaryFilePath());
printf("DONE\n");
}
#pragma clang diagnostic pop
// CHECK-NOT: ASSERTION FAILED
// CHECK-RTSAN-COUNT-6: Intercepted call to real-time unsafe function `syscall`
// CHECK: DONE
|
