1 // RUN: %clangxx_msan -O0 %s -o %t && %run %t 2>&1
2 // RUN: %clangxx_msan -O3 %s -o %t && %run %t 2>&1
3
4 #include <assert.h>
5 #include <errno.h>
6 #include <glob.h>
7 #include <stdio.h>
8 #include <string.h>
9
10 #include <linux/aio_abi.h>
11 #include <sys/ptrace.h>
12 #include <sys/stat.h>
13 #include <sys/uio.h>
14
15 #include <sanitizer/linux_syscall_hooks.h>
16 #include <sanitizer/msan_interface.h>
17
18 /* Test the presence of __sanitizer_syscall_ in the tool runtime, and general
19 sanity of their behaviour. */
20
main(int argc,char * argv[])21 int main(int argc, char *argv[]) {
22 char buf[1000];
23 const int kTen = 10;
24 const int kFortyTwo = 42;
25 memset(buf, 0, sizeof(buf));
26 __msan_unpoison(buf, sizeof(buf));
27 __sanitizer_syscall_pre_recvmsg(0, buf, 0);
28 __sanitizer_syscall_pre_rt_sigpending(buf, kTen);
29 __sanitizer_syscall_pre_getdents(0, buf, kTen);
30 __sanitizer_syscall_pre_getdents64(0, buf, kTen);
31
32 __msan_unpoison(buf, sizeof(buf));
33 __sanitizer_syscall_post_recvmsg(0, 0, buf, 0);
34 __sanitizer_syscall_post_rt_sigpending(-1, buf, kTen);
35 __sanitizer_syscall_post_getdents(0, 0, buf, kTen);
36 __sanitizer_syscall_post_getdents64(0, 0, buf, kTen);
37 assert(__msan_test_shadow(buf, sizeof(buf)) == -1);
38
39 __msan_unpoison(buf, sizeof(buf));
40 __sanitizer_syscall_post_recvmsg(kTen, 0, buf, 0);
41
42 // Tell the kernel that the output struct size is 10 bytes, verify that those
43 // bytes are unpoisoned, and the next byte is not.
44 __msan_poison(buf, kTen + 1);
45 __sanitizer_syscall_post_rt_sigpending(0, buf, kTen);
46 assert(__msan_test_shadow(buf, sizeof(buf)) == kTen);
47
48 __msan_poison(buf, kTen + 1);
49 __sanitizer_syscall_post_getdents(kTen, 0, buf, kTen);
50 assert(__msan_test_shadow(buf, sizeof(buf)) == kTen);
51
52 __msan_poison(buf, kTen + 1);
53 __sanitizer_syscall_post_getdents64(kTen, 0, buf, kTen);
54 assert(__msan_test_shadow(buf, sizeof(buf)) == kTen);
55
56 __msan_poison(buf, sizeof(buf));
57 __sanitizer_syscall_post_clock_getres(0, 0, buf);
58 assert(__msan_test_shadow(buf, sizeof(buf)) == sizeof(long) * 2);
59
60 __msan_poison(buf, sizeof(buf));
61 __sanitizer_syscall_post_clock_gettime(0, 0, buf);
62 assert(__msan_test_shadow(buf, sizeof(buf)) == sizeof(long) * 2);
63
64 // Failed syscall does not write to the buffer.
65 __msan_poison(buf, sizeof(buf));
66 __sanitizer_syscall_post_clock_gettime(-1, 0, buf);
67 assert(__msan_test_shadow(buf, sizeof(buf)) == 0);
68
69 __msan_poison(buf, sizeof(buf));
70 __sanitizer_syscall_post_read(5, 42, buf, 10);
71 assert(__msan_test_shadow(buf, sizeof(buf)) == 5);
72
73 __msan_poison(buf, sizeof(buf));
74 __sanitizer_syscall_post_newfstatat(0, 5, "/path/to/file", buf, 0);
75 assert(__msan_test_shadow(buf, sizeof(buf)) == sizeof(struct stat));
76
77 __msan_poison(buf, sizeof(buf));
78 int prio = 0;
79 __sanitizer_syscall_post_mq_timedreceive(kFortyTwo, 5, buf, sizeof(buf), &prio, 0);
80 assert(__msan_test_shadow(buf, sizeof(buf)) == kFortyTwo);
81 assert(__msan_test_shadow(&prio, sizeof(prio)) == -1);
82
83 __msan_poison(buf, sizeof(buf));
84 __sanitizer_syscall_post_ptrace(0, PTRACE_PEEKUSER, kFortyTwo, 0xABCD, buf);
85 assert(__msan_test_shadow(buf, sizeof(buf)) == sizeof(void *));
86
87 __msan_poison(buf, sizeof(buf));
88 struct iocb iocb[3];
89 struct iocb *iocbp[3] = { &iocb[0], &iocb[1], &iocb[2] };
90 memset(iocb, 0, sizeof(iocb));
91 iocb[0].aio_lio_opcode = IOCB_CMD_PREAD;
92 iocb[0].aio_buf = (__u64)buf;
93 iocb[0].aio_nbytes = 10;
94 iocb[1].aio_lio_opcode = IOCB_CMD_PREAD;
95 iocb[1].aio_buf = (__u64)(&buf[20]);
96 iocb[1].aio_nbytes = 15;
97 struct iovec vec[2] = { {&buf[40], 3}, {&buf[50], 20} };
98 iocb[2].aio_lio_opcode = IOCB_CMD_PREADV;
99 iocb[2].aio_buf = (__u64)(&vec);
100 iocb[2].aio_nbytes = 2;
101 __sanitizer_syscall_pre_io_submit(0, 3, &iocbp);
102 assert(__msan_test_shadow(buf, sizeof(buf)) == 10);
103 assert(__msan_test_shadow(buf + 20, sizeof(buf) - 20) == 15);
104 assert(__msan_test_shadow(buf + 40, sizeof(buf) - 40) == 3);
105 assert(__msan_test_shadow(buf + 50, sizeof(buf) - 50) == 20);
106
107 __msan_poison(buf, sizeof(buf));
108 char *p = buf;
109 __msan_poison(&p, sizeof(p));
110 __sanitizer_syscall_post_io_setup(0, 1, &p);
111 assert(__msan_test_shadow(&p, sizeof(p)) == -1);
112 assert(__msan_test_shadow(buf, sizeof(buf)) >= 32);
113
114 return 0;
115 }
116