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Linux/tools/testing/selftests/ptrace/peeksiginfo.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 #define _GNU_SOURCE
  3 #include <stdio.h>
  4 #include <signal.h>
  5 #include <unistd.h>
  6 #include <errno.h>
  7 #include <linux/types.h>
  8 #include <sys/wait.h>
  9 #include <sys/syscall.h>
 10 #include <sys/user.h>
 11 #include <sys/mman.h>
 12 
 13 #include "linux/ptrace.h"
 14 
 15 static int sys_rt_sigqueueinfo(pid_t tgid, int sig, siginfo_t *uinfo)
 16 {
 17         return syscall(SYS_rt_sigqueueinfo, tgid, sig, uinfo);
 18 }
 19 
 20 static int sys_rt_tgsigqueueinfo(pid_t tgid, pid_t tid,
 21                                         int sig, siginfo_t *uinfo)
 22 {
 23         return syscall(SYS_rt_tgsigqueueinfo, tgid, tid, sig, uinfo);
 24 }
 25 
 26 static int sys_ptrace(int request, pid_t pid, void *addr, void *data)
 27 {
 28         return syscall(SYS_ptrace, request, pid, addr, data);
 29 }
 30 
 31 #define SIGNR 10
 32 #define TEST_SICODE_PRIV        -1
 33 #define TEST_SICODE_SHARE       -2
 34 
 35 #ifndef PAGE_SIZE
 36 #define PAGE_SIZE sysconf(_SC_PAGESIZE)
 37 #endif
 38 
 39 #define err(fmt, ...)                                           \
 40                 fprintf(stderr,                                 \
 41                         "Error (%s:%d): " fmt,                  \
 42                         __FILE__, __LINE__, ##__VA_ARGS__)
 43 
 44 static int check_error_paths(pid_t child)
 45 {
 46         struct ptrace_peeksiginfo_args arg;
 47         int ret, exit_code = -1;
 48         void *addr_rw, *addr_ro;
 49 
 50         /*
 51          * Allocate two contiguous pages. The first one is for read-write,
 52          * another is for read-only.
 53          */
 54         addr_rw = mmap(NULL, 2 * PAGE_SIZE, PROT_READ | PROT_WRITE,
 55                                 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
 56         if (addr_rw == MAP_FAILED) {
 57                 err("mmap() failed: %m\n");
 58                 return 1;
 59         }
 60 
 61         addr_ro = mmap(addr_rw + PAGE_SIZE, PAGE_SIZE, PROT_READ,
 62                         MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, -1, 0);
 63         if (addr_ro == MAP_FAILED) {
 64                 err("mmap() failed: %m\n");
 65                 goto out;
 66         }
 67 
 68         arg.nr = SIGNR;
 69         arg.off = 0;
 70 
 71         /* Unsupported flags */
 72         arg.flags = ~0;
 73         ret = sys_ptrace(PTRACE_PEEKSIGINFO, child, &arg, addr_rw);
 74         if (ret != -1 || errno != EINVAL) {
 75                 err("sys_ptrace() returns %d (expected -1),"
 76                                 " errno %d (expected %d): %m\n",
 77                                 ret, errno, EINVAL);
 78                 goto out;
 79         }
 80         arg.flags = 0;
 81 
 82         /* A part of the buffer is read-only */
 83         ret = sys_ptrace(PTRACE_PEEKSIGINFO, child, &arg,
 84                                         addr_ro - sizeof(siginfo_t) * 2);
 85         if (ret != 2) {
 86                 err("sys_ptrace() returns %d (expected 2): %m\n", ret);
 87                 goto out;
 88         }
 89 
 90         /* Read-only buffer */
 91         ret = sys_ptrace(PTRACE_PEEKSIGINFO, child, &arg, addr_ro);
 92         if (ret != -1 && errno != EFAULT) {
 93                 err("sys_ptrace() returns %d (expected -1),"
 94                                 " errno %d (expected %d): %m\n",
 95                                 ret, errno, EFAULT);
 96                 goto out;
 97         }
 98 
 99         exit_code = 0;
100 out:
101         munmap(addr_rw, 2 * PAGE_SIZE);
102         return exit_code;
103 }
104 
105 int check_direct_path(pid_t child, int shared, int nr)
106 {
107         struct ptrace_peeksiginfo_args arg = {.flags = 0, .nr = nr, .off = 0};
108         int i, j, ret, exit_code = -1;
109         siginfo_t siginfo[SIGNR];
110         int si_code;
111 
112         if (shared == 1) {
113                 arg.flags = PTRACE_PEEKSIGINFO_SHARED;
114                 si_code = TEST_SICODE_SHARE;
115         } else {
116                 arg.flags = 0;
117                 si_code = TEST_SICODE_PRIV;
118         }
119 
120         for (i = 0; i < SIGNR; ) {
121                 arg.off = i;
122                 ret = sys_ptrace(PTRACE_PEEKSIGINFO, child, &arg, siginfo);
123                 if (ret == -1) {
124                         err("ptrace() failed: %m\n");
125                         goto out;
126                 }
127 
128                 if (ret == 0)
129                         break;
130 
131                 for (j = 0; j < ret; j++, i++) {
132                         if (siginfo[j].si_code == si_code &&
133                             siginfo[j].si_int == i)
134                                 continue;
135 
136                         err("%d: Wrong siginfo i=%d si_code=%d si_int=%d\n",
137                              shared, i, siginfo[j].si_code, siginfo[j].si_int);
138                         goto out;
139                 }
140         }
141 
142         if (i != SIGNR) {
143                 err("Only %d signals were read\n", i);
144                 goto out;
145         }
146 
147         exit_code = 0;
148 out:
149         return exit_code;
150 }
151 
152 int main(int argc, char *argv[])
153 {
154         siginfo_t siginfo[SIGNR];
155         int i, exit_code = 1;
156         sigset_t blockmask;
157         pid_t child;
158 
159         sigemptyset(&blockmask);
160         sigaddset(&blockmask, SIGRTMIN);
161         sigprocmask(SIG_BLOCK, &blockmask, NULL);
162 
163         child = fork();
164         if (child == -1) {
165                 err("fork() failed: %m");
166                 return 1;
167         } else if (child == 0) {
168                 pid_t ppid = getppid();
169                 while (1) {
170                         if (ppid != getppid())
171                                 break;
172                         sleep(1);
173                 }
174                 return 1;
175         }
176 
177         /* Send signals in process-wide and per-thread queues */
178         for (i = 0; i < SIGNR; i++) {
179                 siginfo->si_code = TEST_SICODE_SHARE;
180                 siginfo->si_int = i;
181                 sys_rt_sigqueueinfo(child, SIGRTMIN, siginfo);
182 
183                 siginfo->si_code = TEST_SICODE_PRIV;
184                 siginfo->si_int = i;
185                 sys_rt_tgsigqueueinfo(child, child, SIGRTMIN, siginfo);
186         }
187 
188         if (sys_ptrace(PTRACE_ATTACH, child, NULL, NULL) == -1)
189                 return 1;
190 
191         waitpid(child, NULL, 0);
192 
193         /* Dump signals one by one*/
194         if (check_direct_path(child, 0, 1))
195                 goto out;
196         /* Dump all signals for one call */
197         if (check_direct_path(child, 0, SIGNR))
198                 goto out;
199 
200         /*
201          * Dump signal from the process-wide queue.
202          * The number of signals is not multible to the buffer size
203          */
204         if (check_direct_path(child, 1, 3))
205                 goto out;
206 
207         if (check_error_paths(child))
208                 goto out;
209 
210         printf("PASS\n");
211         exit_code = 0;
212 out:
213         if (sys_ptrace(PTRACE_KILL, child, NULL, NULL) == -1)
214                 return 1;
215 
216         waitpid(child, NULL, 0);
217 
218         return exit_code;
219 }
220 

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