Ejemplos de arch_can_dump_task en C++ (Cpp)

Ejemplo n.º 1

Archivo: parasite-syscall.c Proyecto: kunalkushwaha/crtools

struct parasite_ctl *parasite_prep_ctl(pid_t pid, struct vm_area_list *vma_area_list)
{
	struct parasite_ctl *ctl = NULL;
	struct vma_area *vma_area;

	if (!arch_can_dump_task(pid))
		goto err;

	/*
	 * Control block early setup.
	 */
	ctl = xzalloc(sizeof(*ctl));
	if (!ctl) {
		pr_err("Parasite control block allocation failed (pid: %d)\n", pid);
		goto err;
	}

	ctl->tsock = -1;

	if (ptrace(PTRACE_GETREGS, pid, NULL, &ctl->regs_orig)) {
		pr_err("Can't obtain registers (pid: %d)\n", pid);
		goto err;
	}

	vma_area = get_vma_by_ip(&vma_area_list->h, REG_IP(ctl->regs_orig));
	if (!vma_area) {
		pr_err("No suitable VMA found to run parasite "
		       "bootstrap code (pid: %d)\n", pid);
		goto err;
	}

	ctl->pid.real	= pid;
	ctl->pid.virt	= 0;
	ctl->syscall_ip	= vma_area->vma.start;

	/*
	 * Inject syscall instruction and remember original code,
	 * we will need it to restore original program content.
	 */
	memcpy(ctl->code_orig, code_syscall, sizeof(ctl->code_orig));
	if (ptrace_swap_area(pid, (void *)ctl->syscall_ip,
			     (void *)ctl->code_orig, sizeof(ctl->code_orig))) {
		pr_err("Can't inject syscall blob (pid: %d)\n", pid);
		goto err;
	}

	return ctl;

err:
	xfree(ctl);
	return NULL;
}

Ejemplo n.º 2

Archivo: infect.c Proyecto: Snorch/criu

int compel_infect(struct parasite_ctl *ctl, unsigned long nr_threads, unsigned long args_size)
{
	int ret;
	unsigned long p, map_exchange_size, parasite_size = 0;

	if (ctl->pblob.parasite_type != COMPEL_BLOB_CHEADER)
		goto err;

	if (ctl->ictx.log_fd < 0)
		goto err;

	if (!arch_can_dump_task(ctl))
		goto err;

	/*
	 * Inject a parasite engine. Ie allocate memory inside alien
	 * space and copy engine code there. Then re-map the engine
	 * locally, so we will get an easy way to access engine memory
	 * without using ptrace at all.
	 */

	parasite_size = total_pie_size(ctl->pblob.hdr.bsize);

	ctl->args_size = round_up(args_size, PAGE_SIZE);
	parasite_size += ctl->args_size;

	map_exchange_size = parasite_size;
	map_exchange_size += RESTORE_STACK_SIGFRAME + PARASITE_STACK_SIZE;
	if (nr_threads > 1)
		map_exchange_size += PARASITE_STACK_SIZE;

	ret = compel_map_exchange(ctl, map_exchange_size);
	if (ret)
		goto err;

	pr_info("Putting parasite blob into %p->%p\n", ctl->local_map, ctl->remote_map);

	ctl->parasite_ip = (unsigned long)(ctl->remote_map + ctl->pblob.hdr.parasite_ip_off);
	ctl->addr_cmd = ctl->local_map + ctl->pblob.hdr.addr_cmd_off;
	ctl->addr_args = ctl->local_map + ctl->pblob.hdr.addr_arg_off;

	memcpy(ctl->local_map, ctl->pblob.hdr.mem, ctl->pblob.hdr.bsize);
	if (ctl->pblob.hdr.nr_relocs)
		compel_relocs_apply(ctl->local_map, ctl->remote_map, ctl->pblob.hdr.bsize,
				    ctl->pblob.hdr.relocs, ctl->pblob.hdr.nr_relocs);

	p = parasite_size;

	ctl->rsigframe	= ctl->remote_map + p;
	ctl->sigframe	= ctl->local_map  + p;

	p += RESTORE_STACK_SIGFRAME;
	p += PARASITE_STACK_SIZE;
	ctl->rstack = ctl->remote_map + p;

	if (nr_threads > 1) {
		p += PARASITE_STACK_SIZE;
		ctl->r_thread_stack = ctl->remote_map + p;
	}

	ret = arch_fetch_sas(ctl, ctl->rsigframe);
	if (ret) {
		pr_err("Can't fetch sigaltstack for task %d (ret %d)\n",
		       ctl->rpid, ret);
		goto err;
	}

	if (parasite_start_daemon(ctl))
		goto err;

	return 0;

err:
	return -1;
}