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
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
|
// SPDX-License-Identifier: GPL-2.0
#define _GNU_SOURCE
#include <stdio.h>
#include <signal.h>
#include <unistd.h>
#include <errno.h>
#include <linux/types.h>
#include <sys/wait.h>
#include <sys/syscall.h>
#include <sys/user.h>
#include <sys/mman.h>
#include "linux/ptrace.h"
static int sys_rt_sigqueueinfo(pid_t tgid, int sig, siginfo_t *uinfo)
{
return syscall(SYS_rt_sigqueueinfo, tgid, sig, uinfo);
}
static int sys_rt_tgsigqueueinfo(pid_t tgid, pid_t tid,
int sig, siginfo_t *uinfo)
{
return syscall(SYS_rt_tgsigqueueinfo, tgid, tid, sig, uinfo);
}
static int sys_ptrace(int request, pid_t pid, void *addr, void *data)
{
return syscall(SYS_ptrace, request, pid, addr, data);
}
#define SIGNR 10
#define TEST_SICODE_PRIV -1
#define TEST_SICODE_SHARE -2
#ifndef PAGE_SIZE
#define PAGE_SIZE sysconf(_SC_PAGESIZE)
#endif
#define err(fmt, ...) \
fprintf(stderr, \
"Error (%s:%d): " fmt, \
__FILE__, __LINE__, ##__VA_ARGS__)
static int check_error_paths(pid_t child)
{
struct ptrace_peeksiginfo_args arg;
int ret, exit_code = -1;
void *addr_rw, *addr_ro;
/*
* Allocate two contiguous pages. The first one is for read-write,
* another is for read-only.
*/
addr_rw = mmap(NULL, 2 * PAGE_SIZE, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (addr_rw == MAP_FAILED) {
err("mmap() failed: %m\n");
return 1;
}
addr_ro = mmap(addr_rw + PAGE_SIZE, PAGE_SIZE, PROT_READ,
MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, -1, 0);
if (addr_ro == MAP_FAILED) {
err("mmap() failed: %m\n");
goto out;
}
arg.nr = SIGNR;
arg.off = 0;
/* Unsupported flags */
arg.flags = ~0;
ret = sys_ptrace(PTRACE_PEEKSIGINFO, child, &arg, addr_rw);
if (ret != -1 || errno != EINVAL) {
err("sys_ptrace() returns %d (expected -1),"
" errno %d (expected %d): %m\n",
ret, errno, EINVAL);
goto out;
}
arg.flags = 0;
/* A part of the buffer is read-only */
ret = sys_ptrace(PTRACE_PEEKSIGINFO, child, &arg,
addr_ro - sizeof(siginfo_t) * 2);
if (ret != 2) {
err("sys_ptrace() returns %d (expected 2): %m\n", ret);
goto out;
}
/* Read-only buffer */
ret = sys_ptrace(PTRACE_PEEKSIGINFO, child, &arg, addr_ro);
if (ret != -1 && errno != EFAULT) {
err("sys_ptrace() returns %d (expected -1),"
" errno %d (expected %d): %m\n",
ret, errno, EFAULT);
goto out;
}
exit_code = 0;
out:
munmap(addr_rw, 2 * PAGE_SIZE);
return exit_code;
}
int check_direct_path(pid_t child, int shared, int nr)
{
struct ptrace_peeksiginfo_args arg = {.flags = 0, .nr = nr, .off = 0};
int i, j, ret, exit_code = -1;
siginfo_t siginfo[SIGNR];
int si_code;
if (shared == 1) {
arg.flags = PTRACE_PEEKSIGINFO_SHARED;
si_code = TEST_SICODE_SHARE;
} else {
arg.flags = 0;
si_code = TEST_SICODE_PRIV;
}
for (i = 0; i < SIGNR; ) {
arg.off = i;
ret = sys_ptrace(PTRACE_PEEKSIGINFO, child, &arg, siginfo);
if (ret == -1) {
err("ptrace() failed: %m\n");
goto out;
}
if (ret == 0)
break;
for (j = 0; j < ret; j++, i++) {
if (siginfo[j].si_code == si_code &&
siginfo[j].si_int == i)
continue;
err("%d: Wrong siginfo i=%d si_code=%d si_int=%d\n",
shared, i, siginfo[j].si_code, siginfo[j].si_int);
goto out;
}
}
if (i != SIGNR) {
err("Only %d signals were read\n", i);
goto out;
}
exit_code = 0;
out:
return exit_code;
}
int main(int argc, char *argv[])
{
siginfo_t siginfo;
int i, exit_code = 1;
sigset_t blockmask;
pid_t child;
sigemptyset(&blockmask);
sigaddset(&blockmask, SIGRTMIN);
sigprocmask(SIG_BLOCK, &blockmask, NULL);
child = fork();
if (child == -1) {
err("fork() failed: %m");
return 1;
} else if (child == 0) {
pid_t ppid = getppid();
while (1) {
if (ppid != getppid())
break;
sleep(1);
}
return 1;
}
/* Send signals in process-wide and per-thread queues */
for (i = 0; i < SIGNR; i++) {
siginfo.si_code = TEST_SICODE_SHARE;
siginfo.si_int = i;
sys_rt_sigqueueinfo(child, SIGRTMIN, &siginfo);
siginfo.si_code = TEST_SICODE_PRIV;
siginfo.si_int = i;
sys_rt_tgsigqueueinfo(child, child, SIGRTMIN, &siginfo);
}
if (sys_ptrace(PTRACE_ATTACH, child, NULL, NULL) == -1)
return 1;
waitpid(child, NULL, 0);
/* Dump signals one by one*/
if (check_direct_path(child, 0, 1))
goto out;
/* Dump all signals for one call */
if (check_direct_path(child, 0, SIGNR))
goto out;
/*
* Dump signal from the process-wide queue.
* The number of signals is not multible to the buffer size
*/
if (check_direct_path(child, 1, 3))
goto out;
if (check_error_paths(child))
goto out;
printf("PASS\n");
exit_code = 0;
out:
if (sys_ptrace(PTRACE_KILL, child, NULL, NULL) == -1)
return 1;
waitpid(child, NULL, 0);
return exit_code;
}
|
