// 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[SIGNR];
|
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;
|
}
|
