1 /*
2 * Check decoding of prctl PR_GET_TID_ADDRESS operation.
3 *
4 * Copyright (c) 2016 Eugene Syromyatnikov <evgsyr@gmail.com>
5 * Copyright (c) 2016-2017 The strace developers.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. The name of the author may not be used to endorse or promote products
17 * derived from this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #include "tests.h"
32 #include <asm/unistd.h>
33 #include <linux/prctl.h>
34
35 #if defined __NR_prctl && defined __NR_set_tid_address && \
36 defined PR_GET_TID_ADDRESS
37
38 # include <inttypes.h>
39 # include <stdio.h>
40 # include <unistd.h>
41
42 static const char *
sprintaddr(kernel_ulong_t addr)43 sprintaddr(kernel_ulong_t addr)
44 {
45 static char buf[sizeof("0x") + sizeof(addr) * 2];
46
47 if (addr) {
48 snprintf(buf, sizeof(buf), "%#llx", (unsigned long long) addr);
49
50 return buf;
51 }
52
53 return "NULL";
54 }
55
56 int
main(void)57 main(void)
58 {
59 static const kernel_ulong_t bogus_addr =
60 (kernel_ulong_t) 0xfffffffffffffffdULL;
61
62 /* Note that kernel puts kernel-sized pointer even on x32 */
63 TAIL_ALLOC_OBJECT_CONST_PTR(kernel_ulong_t, ptr);
64 long rc;
65 long set_ok;
66
67 *ptr = (kernel_ulong_t) 0xbadc0dedda7a1057ULL;
68
69 rc = syscall(__NR_prctl, PR_GET_TID_ADDRESS, NULL);
70 printf("prctl(PR_GET_TID_ADDRESS, NULL) = %s\n", sprintrc(rc));
71
72 rc = syscall(__NR_prctl, PR_GET_TID_ADDRESS, bogus_addr);
73 printf("prctl(PR_GET_TID_ADDRESS, %#llx) = %s\n",
74 (unsigned long long) bogus_addr, sprintrc(rc));
75
76 rc = syscall(__NR_prctl, PR_GET_TID_ADDRESS, ptr);
77 if (rc) {
78 printf("prctl(PR_GET_TID_ADDRESS, %p) = %s\n",
79 ptr, sprintrc(rc));
80 } else {
81 printf("prctl(PR_GET_TID_ADDRESS, [%s]) = %s\n",
82 sprintaddr(*ptr), sprintrc(rc));
83 }
84
85 set_ok = syscall(__NR_set_tid_address, bogus_addr);
86
87 rc = syscall(__NR_prctl, PR_GET_TID_ADDRESS, ptr);
88 if (rc) {
89 printf("prctl(PR_GET_TID_ADDRESS, %p) = %s\n",
90 ptr, sprintrc(rc));
91 } else {
92 printf("prctl(PR_GET_TID_ADDRESS, [%s]) = %s\n",
93 sprintaddr(set_ok ? bogus_addr : *ptr), sprintrc(rc));
94 }
95
96 puts("+++ exited with 0 +++");
97 return 0;
98 }
99
100 #else
101
102 SKIP_MAIN_UNDEFINED("__NR_prctl && __NR_set_tid_address && PR_GET_TID_ADDRESS")
103
104 #endif
105