~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/tools/testing/selftests/ptrace/peeksiginfo.c

Version: ~ [ linux-5.12-rc1 ] ~ [ linux-5.11.2 ] ~ [ linux-5.10.19 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.101 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.177 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.222 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.258 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.258 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

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

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp