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Commit | Line | Data |
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17afab1d AV |
1 | #define _GNU_SOURCE |
2 | #include <stdio.h> | |
3 | #include <signal.h> | |
4 | #include <unistd.h> | |
5 | #include <errno.h> | |
6 | #include <linux/types.h> | |
7 | #include <sys/wait.h> | |
8 | #include <sys/syscall.h> | |
9 | #include <sys/user.h> | |
10 | #include <sys/mman.h> | |
11 | ||
12 | #include "linux/ptrace.h" | |
13 | ||
14 | static int sys_rt_sigqueueinfo(pid_t tgid, int sig, siginfo_t *uinfo) | |
15 | { | |
16 | return syscall(SYS_rt_sigqueueinfo, tgid, sig, uinfo); | |
17 | } | |
18 | ||
19 | static int sys_rt_tgsigqueueinfo(pid_t tgid, pid_t tid, | |
20 | int sig, siginfo_t *uinfo) | |
21 | { | |
22 | return syscall(SYS_rt_tgsigqueueinfo, tgid, tid, sig, uinfo); | |
23 | } | |
24 | ||
25 | static int sys_ptrace(int request, pid_t pid, void *addr, void *data) | |
26 | { | |
27 | return syscall(SYS_ptrace, request, pid, addr, data); | |
28 | } | |
29 | ||
30 | #define SIGNR 10 | |
31 | #define TEST_SICODE_PRIV -1 | |
32 | #define TEST_SICODE_SHARE -2 | |
33 | ||
8b6aaf65 TF |
34 | #ifndef PAGE_SIZE |
35 | #define PAGE_SIZE sysconf(_SC_PAGESIZE) | |
36 | #endif | |
37 | ||
17afab1d AV |
38 | #define err(fmt, ...) \ |
39 | fprintf(stderr, \ | |
40 | "Error (%s:%d): " fmt, \ | |
41 | __FILE__, __LINE__, ##__VA_ARGS__) | |
42 | ||
43 | static int check_error_paths(pid_t child) | |
44 | { | |
45 | struct ptrace_peeksiginfo_args arg; | |
46 | int ret, exit_code = -1; | |
47 | void *addr_rw, *addr_ro; | |
48 | ||
49 | /* | |
50 | * Allocate two contiguous pages. The first one is for read-write, | |
51 | * another is for read-only. | |
52 | */ | |
53 | addr_rw = mmap(NULL, 2 * PAGE_SIZE, PROT_READ | PROT_WRITE, | |
54 | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); | |
55 | if (addr_rw == MAP_FAILED) { | |
56 | err("mmap() failed: %m\n"); | |
57 | return 1; | |
58 | } | |
59 | ||
60 | addr_ro = mmap(addr_rw + PAGE_SIZE, PAGE_SIZE, PROT_READ, | |
61 | MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, -1, 0); | |
62 | if (addr_ro == MAP_FAILED) { | |
63 | err("mmap() failed: %m\n"); | |
64 | goto out; | |
65 | } | |
66 | ||
67 | arg.nr = SIGNR; | |
68 | arg.off = 0; | |
69 | ||
70 | /* Unsupported flags */ | |
71 | arg.flags = ~0; | |
72 | ret = sys_ptrace(PTRACE_PEEKSIGINFO, child, &arg, addr_rw); | |
73 | if (ret != -1 || errno != EINVAL) { | |
74 | err("sys_ptrace() returns %d (expected -1)," | |
75 | " errno %d (expected %d): %m\n", | |
76 | ret, errno, EINVAL); | |
77 | goto out; | |
78 | } | |
79 | arg.flags = 0; | |
80 | ||
81 | /* A part of the buffer is read-only */ | |
82 | ret = sys_ptrace(PTRACE_PEEKSIGINFO, child, &arg, | |
83 | addr_ro - sizeof(siginfo_t) * 2); | |
84 | if (ret != 2) { | |
85 | err("sys_ptrace() returns %d (expected 2): %m\n", ret); | |
86 | goto out; | |
87 | } | |
88 | ||
89 | /* Read-only buffer */ | |
90 | ret = sys_ptrace(PTRACE_PEEKSIGINFO, child, &arg, addr_ro); | |
91 | if (ret != -1 && errno != EFAULT) { | |
92 | err("sys_ptrace() returns %d (expected -1)," | |
93 | " errno %d (expected %d): %m\n", | |
94 | ret, errno, EFAULT); | |
95 | goto out; | |
96 | } | |
97 | ||
98 | exit_code = 0; | |
99 | out: | |
100 | munmap(addr_rw, 2 * PAGE_SIZE); | |
101 | return exit_code; | |
102 | } | |
103 | ||
104 | int check_direct_path(pid_t child, int shared, int nr) | |
105 | { | |
106 | struct ptrace_peeksiginfo_args arg = {.flags = 0, .nr = nr, .off = 0}; | |
107 | int i, j, ret, exit_code = -1; | |
108 | siginfo_t siginfo[SIGNR]; | |
109 | int si_code; | |
110 | ||
111 | if (shared == 1) { | |
112 | arg.flags = PTRACE_PEEKSIGINFO_SHARED; | |
113 | si_code = TEST_SICODE_SHARE; | |
114 | } else { | |
115 | arg.flags = 0; | |
116 | si_code = TEST_SICODE_PRIV; | |
117 | } | |
118 | ||
119 | for (i = 0; i < SIGNR; ) { | |
120 | arg.off = i; | |
121 | ret = sys_ptrace(PTRACE_PEEKSIGINFO, child, &arg, siginfo); | |
122 | if (ret == -1) { | |
123 | err("ptrace() failed: %m\n"); | |
124 | goto out; | |
125 | } | |
126 | ||
127 | if (ret == 0) | |
128 | break; | |
129 | ||
130 | for (j = 0; j < ret; j++, i++) { | |
131 | if (siginfo[j].si_code == si_code && | |
132 | siginfo[j].si_int == i) | |
133 | continue; | |
134 | ||
135 | err("%d: Wrong siginfo i=%d si_code=%d si_int=%d\n", | |
136 | shared, i, siginfo[j].si_code, siginfo[j].si_int); | |
137 | goto out; | |
138 | } | |
139 | } | |
140 | ||
141 | if (i != SIGNR) { | |
142 | err("Only %d signals were read\n", i); | |
143 | goto out; | |
144 | } | |
145 | ||
146 | exit_code = 0; | |
147 | out: | |
148 | return exit_code; | |
149 | } | |
150 | ||
151 | int main(int argc, char *argv[]) | |
152 | { | |
153 | siginfo_t siginfo[SIGNR]; | |
154 | int i, exit_code = 1; | |
155 | sigset_t blockmask; | |
156 | pid_t child; | |
157 | ||
158 | sigemptyset(&blockmask); | |
159 | sigaddset(&blockmask, SIGRTMIN); | |
160 | sigprocmask(SIG_BLOCK, &blockmask, NULL); | |
161 | ||
162 | child = fork(); | |
163 | if (child == -1) { | |
164 | err("fork() failed: %m"); | |
165 | return 1; | |
166 | } else if (child == 0) { | |
167 | pid_t ppid = getppid(); | |
168 | while (1) { | |
169 | if (ppid != getppid()) | |
170 | break; | |
171 | sleep(1); | |
172 | } | |
173 | return 1; | |
174 | } | |
175 | ||
176 | /* Send signals in process-wide and per-thread queues */ | |
177 | for (i = 0; i < SIGNR; i++) { | |
178 | siginfo->si_code = TEST_SICODE_SHARE; | |
179 | siginfo->si_int = i; | |
180 | sys_rt_sigqueueinfo(child, SIGRTMIN, siginfo); | |
181 | ||
182 | siginfo->si_code = TEST_SICODE_PRIV; | |
183 | siginfo->si_int = i; | |
184 | sys_rt_tgsigqueueinfo(child, child, SIGRTMIN, siginfo); | |
185 | } | |
186 | ||
187 | if (sys_ptrace(PTRACE_ATTACH, child, NULL, NULL) == -1) | |
188 | return 1; | |
189 | ||
190 | waitpid(child, NULL, 0); | |
191 | ||
192 | /* Dump signals one by one*/ | |
193 | if (check_direct_path(child, 0, 1)) | |
194 | goto out; | |
195 | /* Dump all signals for one call */ | |
196 | if (check_direct_path(child, 0, SIGNR)) | |
197 | goto out; | |
198 | ||
199 | /* | |
200 | * Dump signal from the process-wide queue. | |
201 | * The number of signals is not multible to the buffer size | |
202 | */ | |
203 | if (check_direct_path(child, 1, 3)) | |
204 | goto out; | |
205 | ||
206 | if (check_error_paths(child)) | |
207 | goto out; | |
208 | ||
209 | printf("PASS\n"); | |
210 | exit_code = 0; | |
211 | out: | |
212 | if (sys_ptrace(PTRACE_KILL, child, NULL, NULL) == -1) | |
213 | return 1; | |
214 | ||
215 | waitpid(child, NULL, 0); | |
216 | ||
217 | return exit_code; | |
218 | } |