3 * modules/us_manager/helper.c
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 * Copyright (C) Samsung Electronics, 2013
21 * 2013 Vyacheslav Cherkashin: SWAP us_manager implement
26 #include <dbi_kprobes.h>
27 #include <dbi_kprobes_deps.h>
29 #include <writer/kernel_operations.h>
30 #include <writer/swap_writer_module.h>
31 #include "us_slot_manager.h"
32 #include "sspt/sspt.h"
37 struct task_struct *check_task(struct task_struct *task);
40 ******************************************************************************
42 ******************************************************************************
49 static int entry_handler_mf(struct kretprobe_instance *ri, struct pt_regs *regs)
51 struct pf_data *data = (struct pf_data *)ri->data;
53 data->addr = swap_get_karg(regs, 2);
58 /* Detects when IPs are really loaded into phy mem and installs probes. */
59 static int ret_handler_mf(struct kretprobe_instance *ri, struct pt_regs *regs)
61 struct task_struct *task;
62 unsigned long page_addr;
64 task = current->group_leader;
68 /* TODO: check return value */
69 page_addr = ((struct pf_data *)ri->data)->addr & PAGE_MASK;
70 call_page_fault(task, page_addr);
75 static struct kretprobe mf_kretprobe = {
76 .entry_handler = entry_handler_mf,
77 .handler = ret_handler_mf,
78 .data_size = sizeof(struct pf_data)
84 ******************************************************************************
86 ******************************************************************************
89 static void recover_child(struct task_struct *child_task, struct sspt_proc *proc)
91 sspt_proc_uninstall(proc, child_task, US_DISARM);
92 dbi_disarm_urp_inst_for_task(current, child_task);
95 static void rm_uprobes_child(struct task_struct *task)
97 struct sspt_proc *proc = sspt_proc_get_by_task(current);
99 recover_child(task, proc);
103 /* Delete uprobs in children at fork */
104 static int ret_handler_cp(struct kretprobe_instance *ri, struct pt_regs *regs)
106 struct task_struct *task = (struct task_struct *)regs_return_value(regs);
108 if(!task || IS_ERR(task))
111 if(task->mm != current->mm) { /* check flags CLONE_VM */
112 rm_uprobes_child(task);
118 static struct kretprobe cp_kretprobe = {
119 .handler = ret_handler_cp,
125 ******************************************************************************
127 ******************************************************************************
130 /* Detects when target process removes IPs. */
131 static int mr_pre_handler(struct kprobe *p, struct pt_regs *regs)
133 struct task_struct *task = (struct task_struct *)swap_get_karg(regs, 0);
135 if (is_kthread(task))
138 if (task->tgid != task->pid) {
142 call_mm_release(task);
147 static struct kprobe mr_kprobe = {
148 .pre_handler = mr_pre_handler
154 ******************************************************************************
156 ******************************************************************************
163 static void remove_unmap_probes(struct sspt_proc *proc, struct unmap_data *umd)
165 struct task_struct *task = proc->task;
166 unsigned long start = umd->start;
167 size_t len = PAGE_ALIGN(umd->len);
170 if (sspt_proc_get_files_by_region(proc, &head, start, len)) {
171 struct sspt_file *file, *n;
172 unsigned long end = start + len;
174 list_for_each_entry_safe(file, n, &head, list) {
175 if (file->vm_start >= end)
178 if (file->vm_start >= start) {
179 sspt_file_uninstall(file, task, US_UNINSTALL);
181 /* TODO: uninstall pages: start..file->vm_end */
185 sspt_proc_insert_files(proc, &head);
187 proc_unmap_msg(start, end);
192 static int entry_handler_unmap(struct kretprobe_instance *ri,
193 struct pt_regs *regs)
195 struct unmap_data *data = (struct unmap_data *)ri->data;
197 data->start = swap_get_karg(regs, 1);
198 data->len = (size_t)swap_get_karg(regs, 2);
203 static int ret_handler_unmap(struct kretprobe_instance *ri,
204 struct pt_regs *regs)
206 struct task_struct *task;
207 struct sspt_proc *proc;
209 task = current->group_leader;
210 if (is_kthread(task) ||
211 get_regs_ret_val(regs))
214 proc = sspt_proc_get_by_task(task);
216 remove_unmap_probes(proc, (struct unmap_data *)ri->data);
221 static struct kretprobe unmap_kretprobe = {
222 .entry_handler = entry_handler_unmap,
223 .handler = ret_handler_unmap,
224 .data_size = sizeof(struct unmap_data)
230 ******************************************************************************
232 ******************************************************************************
234 static int ret_handler_mmap(struct kretprobe_instance *ri,
235 struct pt_regs *regs)
237 struct sspt_proc *proc;
238 struct task_struct *task;
239 unsigned long start_addr;
240 struct vm_area_struct *vma;
242 task = current->group_leader;
243 if (is_kthread(task))
246 start_addr = (unsigned long)get_regs_ret_val(regs);
247 if (IS_ERR_VALUE(start_addr))
250 proc = sspt_proc_get_by_task(task);
254 vma = find_vma_intersection(task->mm, start_addr, start_addr + 1);
255 if (vma && check_vma(vma))
261 static struct kretprobe mmap_kretprobe = {
262 .handler = ret_handler_mmap
267 int register_helper(void)
271 /* install kprobe on 'do_munmap' to detect when for remove user space probes */
272 ret = dbi_register_kretprobe(&unmap_kretprobe);
274 printk("dbi_register_kprobe(do_munmap) result=%d!\n", ret);
278 /* install kprobe on 'mm_release' to detect when for remove user space probes */
279 ret = dbi_register_kprobe(&mr_kprobe);
281 printk("dbi_register_kprobe(mm_release) result=%d!\n", ret);
282 goto unregister_unmap;
286 /* install kretprobe on 'copy_process' */
287 ret = dbi_register_kretprobe(&cp_kretprobe);
289 printk("dbi_register_kretprobe(copy_process) result=%d!\n", ret);
293 /* install kretprobe on 'do_mmap_pgoff' to detect when mapping file */
294 ret = dbi_register_kretprobe(&mmap_kretprobe);
296 printk("dbi_register_kretprobe(do_mmap_pgoff) result=%d!\n", ret);
300 /* install kretprobe on 'handle_mm_fault' to detect when they will be loaded */
301 ret = dbi_register_kretprobe(&mf_kretprobe);
303 printk("dbi_register_kretprobe(do_page_fault) result=%d!\n", ret);
304 goto unregister_mmap;
311 dbi_unregister_kretprobe(&mmap_kretprobe);
314 dbi_unregister_kretprobe(&cp_kretprobe);
317 dbi_unregister_kprobe(&mr_kprobe);
320 dbi_unregister_kretprobe(&unmap_kretprobe);
325 void unregister_helper(void)
327 /* uninstall kretprobe with 'handle_mm_fault' */
328 dbi_unregister_kretprobe(&mf_kretprobe);
330 /* uninstall kretprobe with 'do_mmap_pgoff' */
331 dbi_unregister_kretprobe(&mmap_kretprobe);
333 /* uninstall kretprobe with 'copy_process' */
334 dbi_unregister_kretprobe(&cp_kretprobe);
336 /* uninstall kprobe with 'mm_release' */
337 dbi_unregister_kprobe(&mr_kprobe);
339 /* uninstall kretprobe with 'do_munmap' */
340 dbi_unregister_kretprobe(&unmap_kretprobe);
343 int init_helper(void)
346 addr = swap_ksyms("handle_mm_fault");
348 printk("Cannot find address for handle_mm_fault function!\n");
351 mf_kretprobe.kp.addr = (kprobe_opcode_t *)addr;
353 addr = swap_ksyms("copy_process");
355 printk("Cannot find address for copy_process function!\n");
358 cp_kretprobe.kp.addr = (kprobe_opcode_t *)addr;
360 addr = swap_ksyms("mm_release");
362 printk("Cannot find address for mm_release function!\n");
365 mr_kprobe.addr = (kprobe_opcode_t *)addr;
367 addr = swap_ksyms("do_munmap");
369 printk("Cannot find address for do_munmap function!\n");
372 unmap_kretprobe.kp.addr = (kprobe_opcode_t *)addr;
374 addr = swap_ksyms("do_mmap_pgoff");
376 printk("Cannot find address for do_mmap_pgoff function!\n");
379 mmap_kretprobe.kp.addr = (kprobe_opcode_t *)addr;
384 void uninit_helper(void)