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![Ivan Orlov](/assets/img/avatar_default.png)
peeksiginfo creates an array of 10 instances of 'siginfo_t', but actually uses only one. This patch will reduce amount of memory on the stack used by the peeksiginfo test. Signed-off-by: Ivan Orlov <ivan.orlov0322@gmail.com> Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
219 lines
4.6 KiB
C
219 lines
4.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#define _GNU_SOURCE
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#include <stdio.h>
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#include <signal.h>
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#include <unistd.h>
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#include <errno.h>
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#include <linux/types.h>
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#include <sys/wait.h>
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#include <sys/syscall.h>
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#include <sys/user.h>
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#include <sys/mman.h>
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#include "linux/ptrace.h"
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static int sys_rt_sigqueueinfo(pid_t tgid, int sig, siginfo_t *uinfo)
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{
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return syscall(SYS_rt_sigqueueinfo, tgid, sig, uinfo);
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}
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static int sys_rt_tgsigqueueinfo(pid_t tgid, pid_t tid,
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int sig, siginfo_t *uinfo)
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{
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return syscall(SYS_rt_tgsigqueueinfo, tgid, tid, sig, uinfo);
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}
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static int sys_ptrace(int request, pid_t pid, void *addr, void *data)
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{
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return syscall(SYS_ptrace, request, pid, addr, data);
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}
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#define SIGNR 10
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#define TEST_SICODE_PRIV -1
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#define TEST_SICODE_SHARE -2
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#ifndef PAGE_SIZE
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#define PAGE_SIZE sysconf(_SC_PAGESIZE)
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#endif
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#define err(fmt, ...) \
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fprintf(stderr, \
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"Error (%s:%d): " fmt, \
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__FILE__, __LINE__, ##__VA_ARGS__)
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static int check_error_paths(pid_t child)
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{
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struct ptrace_peeksiginfo_args arg;
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int ret, exit_code = -1;
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void *addr_rw, *addr_ro;
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/*
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* Allocate two contiguous pages. The first one is for read-write,
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* another is for read-only.
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*/
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addr_rw = mmap(NULL, 2 * PAGE_SIZE, PROT_READ | PROT_WRITE,
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MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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if (addr_rw == MAP_FAILED) {
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err("mmap() failed: %m\n");
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return 1;
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}
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addr_ro = mmap(addr_rw + PAGE_SIZE, PAGE_SIZE, PROT_READ,
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MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, -1, 0);
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if (addr_ro == MAP_FAILED) {
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err("mmap() failed: %m\n");
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goto out;
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}
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arg.nr = SIGNR;
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arg.off = 0;
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/* Unsupported flags */
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arg.flags = ~0;
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ret = sys_ptrace(PTRACE_PEEKSIGINFO, child, &arg, addr_rw);
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if (ret != -1 || errno != EINVAL) {
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err("sys_ptrace() returns %d (expected -1),"
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" errno %d (expected %d): %m\n",
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ret, errno, EINVAL);
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goto out;
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}
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arg.flags = 0;
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/* A part of the buffer is read-only */
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ret = sys_ptrace(PTRACE_PEEKSIGINFO, child, &arg,
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addr_ro - sizeof(siginfo_t) * 2);
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if (ret != 2) {
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err("sys_ptrace() returns %d (expected 2): %m\n", ret);
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goto out;
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}
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/* Read-only buffer */
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ret = sys_ptrace(PTRACE_PEEKSIGINFO, child, &arg, addr_ro);
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if (ret != -1 && errno != EFAULT) {
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err("sys_ptrace() returns %d (expected -1),"
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" errno %d (expected %d): %m\n",
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ret, errno, EFAULT);
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goto out;
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}
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exit_code = 0;
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out:
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munmap(addr_rw, 2 * PAGE_SIZE);
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return exit_code;
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}
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int check_direct_path(pid_t child, int shared, int nr)
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{
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struct ptrace_peeksiginfo_args arg = {.flags = 0, .nr = nr, .off = 0};
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int i, j, ret, exit_code = -1;
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siginfo_t siginfo[SIGNR];
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int si_code;
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if (shared == 1) {
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arg.flags = PTRACE_PEEKSIGINFO_SHARED;
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si_code = TEST_SICODE_SHARE;
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} else {
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arg.flags = 0;
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si_code = TEST_SICODE_PRIV;
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}
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for (i = 0; i < SIGNR; ) {
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arg.off = i;
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ret = sys_ptrace(PTRACE_PEEKSIGINFO, child, &arg, siginfo);
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if (ret == -1) {
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err("ptrace() failed: %m\n");
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goto out;
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}
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if (ret == 0)
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break;
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for (j = 0; j < ret; j++, i++) {
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if (siginfo[j].si_code == si_code &&
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siginfo[j].si_int == i)
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continue;
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err("%d: Wrong siginfo i=%d si_code=%d si_int=%d\n",
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shared, i, siginfo[j].si_code, siginfo[j].si_int);
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goto out;
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}
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}
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if (i != SIGNR) {
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err("Only %d signals were read\n", i);
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goto out;
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}
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exit_code = 0;
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out:
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return exit_code;
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}
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int main(int argc, char *argv[])
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{
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siginfo_t siginfo;
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int i, exit_code = 1;
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sigset_t blockmask;
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pid_t child;
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sigemptyset(&blockmask);
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sigaddset(&blockmask, SIGRTMIN);
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sigprocmask(SIG_BLOCK, &blockmask, NULL);
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child = fork();
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if (child == -1) {
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err("fork() failed: %m");
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return 1;
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} else if (child == 0) {
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pid_t ppid = getppid();
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while (1) {
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if (ppid != getppid())
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break;
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sleep(1);
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}
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return 1;
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}
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/* Send signals in process-wide and per-thread queues */
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for (i = 0; i < SIGNR; i++) {
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siginfo.si_code = TEST_SICODE_SHARE;
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siginfo.si_int = i;
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sys_rt_sigqueueinfo(child, SIGRTMIN, &siginfo);
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siginfo.si_code = TEST_SICODE_PRIV;
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siginfo.si_int = i;
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sys_rt_tgsigqueueinfo(child, child, SIGRTMIN, &siginfo);
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}
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if (sys_ptrace(PTRACE_ATTACH, child, NULL, NULL) == -1)
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return 1;
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waitpid(child, NULL, 0);
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/* Dump signals one by one*/
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if (check_direct_path(child, 0, 1))
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goto out;
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/* Dump all signals for one call */
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if (check_direct_path(child, 0, SIGNR))
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goto out;
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/*
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* Dump signal from the process-wide queue.
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* The number of signals is not multible to the buffer size
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*/
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if (check_direct_path(child, 1, 3))
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goto out;
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if (check_error_paths(child))
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goto out;
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printf("PASS\n");
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exit_code = 0;
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out:
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if (sys_ptrace(PTRACE_KILL, child, NULL, NULL) == -1)
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return 1;
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waitpid(child, NULL, 0);
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return exit_code;
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}
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