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