syscalls.cc revision 2d1fdb26e458c4ddc04155c1d421bced3ba90cd0 
1// RUN: %clangxx_msan -m64 -O0 %s -o %t && %run %t 2>&1
2// RUN: %clangxx_msan -m64 -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
14#include <sanitizer/linux_syscall_hooks.h>
15#include <sanitizer/msan_interface.h>
16
17/* Test the presence of __sanitizer_syscall_ in the tool runtime, and general
18   sanity of their behaviour. */
19
20int main(int argc, char *argv[]) {
21  char buf[1000];
22  const int kTen = 10;
23  const int kFortyTwo = 42;
24  memset(buf, 0, sizeof(buf));
25  __msan_unpoison(buf, sizeof(buf));
26  __sanitizer_syscall_pre_recvmsg(0, buf, 0);
27  __sanitizer_syscall_pre_rt_sigpending(buf, kTen);
28  __sanitizer_syscall_pre_getdents(0, buf, kTen);
29  __sanitizer_syscall_pre_getdents64(0, buf, kTen);
30
31  __msan_unpoison(buf, sizeof(buf));
32  __sanitizer_syscall_post_recvmsg(0, 0, buf, 0);
33  __sanitizer_syscall_post_rt_sigpending(-1, buf, kTen);
34  __sanitizer_syscall_post_getdents(0, 0, buf, kTen);
35  __sanitizer_syscall_post_getdents64(0, 0, buf, kTen);
36  assert(__msan_test_shadow(buf, sizeof(buf)) == -1);
37
38  __msan_unpoison(buf, sizeof(buf));
39  __sanitizer_syscall_post_recvmsg(kTen, 0, buf, 0);
40
41  // Tell the kernel that the output struct size is 10 bytes, verify that those
42  // bytes are unpoisoned, and the next byte is not.
43  __msan_poison(buf, kTen + 1);
44  __sanitizer_syscall_post_rt_sigpending(0, buf, kTen);
45  assert(__msan_test_shadow(buf, sizeof(buf)) == kTen);
46
47  __msan_poison(buf, kTen + 1);
48  __sanitizer_syscall_post_getdents(kTen, 0, buf, kTen);
49  assert(__msan_test_shadow(buf, sizeof(buf)) == kTen);
50
51  __msan_poison(buf, kTen + 1);
52  __sanitizer_syscall_post_getdents64(kTen, 0, buf, kTen);
53  assert(__msan_test_shadow(buf, sizeof(buf)) == kTen);
54
55  __msan_poison(buf, sizeof(buf));
56  __sanitizer_syscall_post_clock_getres(0, 0, buf);
57  assert(__msan_test_shadow(buf, sizeof(buf)) == sizeof(long) * 2);
58
59  __msan_poison(buf, sizeof(buf));
60  __sanitizer_syscall_post_clock_gettime(0, 0, buf);
61  assert(__msan_test_shadow(buf, sizeof(buf)) == sizeof(long) * 2);
62
63  // Failed syscall does not write to the buffer.
64  __msan_poison(buf, sizeof(buf));
65  __sanitizer_syscall_post_clock_gettime(-1, 0, buf);
66  assert(__msan_test_shadow(buf, sizeof(buf)) == 0);
67
68  __msan_poison(buf, sizeof(buf));
69  __sanitizer_syscall_post_read(5, 42, buf, 10);
70  assert(__msan_test_shadow(buf, sizeof(buf)) == 5);
71
72  __msan_poison(buf, sizeof(buf));
73  __sanitizer_syscall_post_newfstatat(0, 5, "/path/to/file", buf, 0);
74  assert(__msan_test_shadow(buf, sizeof(buf)) == sizeof(struct stat));
75
76  __msan_poison(buf, sizeof(buf));
77  int prio = 0;
78  __sanitizer_syscall_post_mq_timedreceive(kFortyTwo, 5, buf, sizeof(buf), &prio, 0);
79  assert(__msan_test_shadow(buf, sizeof(buf)) == kFortyTwo);
80  assert(__msan_test_shadow(&prio, sizeof(prio)) == -1);
81
82  __msan_poison(buf, sizeof(buf));
83  __sanitizer_syscall_post_ptrace(0, PTRACE_PEEKUSER, kFortyTwo, 0xABCD, buf);
84  assert(__msan_test_shadow(buf, sizeof(buf)) == sizeof(void *));
85
86  __msan_poison(buf, sizeof(buf));
87  struct iocb iocb[2];
88  struct iocb *iocbp[2] = { &iocb[0], &iocb[1] };
89  memset(iocb, 0, sizeof(iocb));
90  iocb[0].aio_lio_opcode = IOCB_CMD_PREAD;
91  iocb[0].aio_buf = (__u64)buf;
92  iocb[0].aio_nbytes = kFortyTwo;
93  iocb[1].aio_lio_opcode = IOCB_CMD_PREAD;
94  iocb[1].aio_buf = (__u64)(&buf[kFortyTwo]);
95  iocb[1].aio_nbytes = kFortyTwo;
96  __sanitizer_syscall_pre_io_submit(0, 2, &iocbp);
97  assert(__msan_test_shadow(buf, sizeof(buf)) == 2 * kFortyTwo);
98
99  __msan_poison(buf, sizeof(buf));
100  char *p = buf;
101  __msan_poison(&p, sizeof(p));
102  __sanitizer_syscall_post_io_setup(0, 1, &p);
103  assert(__msan_test_shadow(&p, sizeof(p)) == -1);
104  assert(__msan_test_shadow(buf, sizeof(buf)) >= 32);
105
106  return 0;
107}
108