2 * Dynamic Binary Instrumentation Module based on KProbes
3 * modules/kprobe/dbi_kprobes_deps.h
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, 2006-2010
21 * 2008-2009 Alexey Gerenkov <a.gerenkov@samsung.com> User-Space
22 * Probes initial implementation; Support x86/ARM/MIPS for both user and kernel spaces.
23 * 2010 Ekaterina Gorelkina <e.gorelkina@samsung.com>: redesign module for separating core and arch parts
28 #include <linux/module.h>
29 #include <linux/sched.h>
31 #include <asm/pgtable.h>
33 #include "dbi_kprobes_deps.h"
34 #include "dbi_kdebug.h"
37 #include <linux/slab.h>
39 unsigned int *sched_addr;
40 unsigned int *fork_addr;
43 #define GUP_FLAGS_WRITE 0x1
44 #define GUP_FLAGS_FORCE 0x2
45 #define GUP_FLAGS_IGNORE_VMA_PERMISSIONS 0x4
46 #define GUP_FLAGS_IGNORE_SIGKILL 0x8
48 #if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 29)
49 struct mm_struct* init_mm_ptr;
50 struct mm_struct init_mm;
54 DECLARE_MOD_CB_DEP(kallsyms_search, unsigned long, const char *name);
55 DECLARE_MOD_FUNC_DEP(access_process_vm, int, struct task_struct * tsk, unsigned long addr, void *buf, int len, int write);
56 DECLARE_MOD_FUNC_DEP(copy_to_user_page, void, struct vm_area_struct *vma, struct page *page, unsigned long uaddr, void *dst, const void *src, unsigned long len);
58 DECLARE_MOD_FUNC_DEP(find_extend_vma, struct vm_area_struct *, struct mm_struct * mm, unsigned long addr);
60 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 30)
61 #if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18)
62 DECLARE_MOD_FUNC_DEP(handle_mm_fault, int, struct mm_struct *mm, struct vm_area_struct *vma, unsigned long address, int write_access);
65 DECLARE_MOD_FUNC_DEP(handle_mm_fault, int, struct mm_struct *mm, struct vm_area_struct *vma, unsigned long address, unsigned int flags);
66 #endif /* LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 30) */
68 DECLARE_MOD_FUNC_DEP(get_gate_vma, struct vm_area_struct *, struct task_struct *tsk);
70 #ifdef CONFIG_HUGETLB_PAGE
71 DECLARE_MOD_FUNC_DEP(follow_hugetlb_page, int, struct mm_struct *mm, struct vm_area_struct *vma, struct page **pages, struct vm_area_struct **vmas, unsigned long *position, int *length, int i, int write);
74 #ifdef __HAVE_ARCH_GATE_AREA
75 DECLARE_MOD_FUNC_DEP(in_gate_area, int, struct task_struct *tsk,unsigned long addr);
77 DECLARE_MOD_FUNC_DEP(in_gate_area_no_task, int, unsigned long addr);
79 DECLARE_MOD_FUNC_DEP(follow_page, \
80 struct page *, struct vm_area_struct * vma, \
81 unsigned long address, unsigned int foll_flags);
82 DECLARE_MOD_FUNC_DEP(__flush_anon_page, \
83 void, struct vm_area_struct *vma, struct page *page, \
84 unsigned long vmaddr);
85 DECLARE_MOD_FUNC_DEP(vm_normal_page, \
86 struct page *, struct vm_area_struct *vma, \
87 unsigned long addr, pte_t pte);
89 DECLARE_MOD_FUNC_DEP(flush_ptrace_access, \
90 void, struct vm_area_struct *vma, struct page *page, \
91 unsigned long uaddr, void *kaddr, unsigned long len, int write);
94 #if (LINUX_VERSION_CODE != KERNEL_VERSION(2, 6, 16))
95 DECLARE_MOD_FUNC_DEP(put_task_struct, \
96 void, struct task_struct *tsk);
98 DECLARE_MOD_FUNC_DEP(put_task_struct, \
99 void, struct rcu_head * rhp);
102 DECLARE_MOD_DEP_WRAPPER(access_process_vm, int, struct task_struct *tsk, unsigned long addr, void *buf, int len, int write)
103 IMP_MOD_DEP_WRAPPER (access_process_vm, tsk, addr, buf, len, write)
105 DECLARE_MOD_DEP_WRAPPER (find_extend_vma, struct vm_area_struct *, struct mm_struct * mm, unsigned long addr)
106 IMP_MOD_DEP_WRAPPER (find_extend_vma, mm, addr)
108 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 30)
109 #if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18)
110 DECLARE_MOD_DEP_WRAPPER (handle_mm_fault, \
111 int, struct mm_struct *mm, struct vm_area_struct *vma, unsigned long address, int write_access)
112 IMP_MOD_DEP_WRAPPER (handle_mm_fault, mm, vma, address, write_access)
115 DECLARE_MOD_DEP_WRAPPER (handle_mm_fault, \
116 int, struct mm_struct *mm, struct vm_area_struct *vma, unsigned long address, unsigned int flags)
117 IMP_MOD_DEP_WRAPPER (handle_mm_fault, mm, vma, address, flags)
120 DECLARE_MOD_DEP_WRAPPER (get_gate_vma, \
121 struct vm_area_struct *, struct task_struct *tsk)
122 IMP_MOD_DEP_WRAPPER (get_gate_vma, tsk)
124 #ifdef CONFIG_HUGETLB_PAGE
125 DECLARE_MOD_DEP_WRAPPER (follow_hugetlb_page, int, struct mm_struct *mm, struct vm_area_struct *vma, struct page **pages, struct vm_area_struct **vmas, unsigned long *position, int *length, int i, int write)
126 IMP_MOD_DEP_WRAPPER (follow_hugetlb_page, mm, vma, pages, vmas, position, length, i, write)
129 #ifdef __HAVE_ARCH_GATE_AREA
130 DECLARE_MOD_DEP_WRAPPER (in_gate_area, int, struct task_struct *tsk, unsigned long addr)
131 IMP_MOD_DEP_WRAPPER (in_gate_area, tsk, addr)
133 DECLARE_MOD_DEP_WRAPPER (in_gate_area_no_task, int, unsigned long addr)
134 IMP_MOD_DEP_WRAPPER (in_gate_area_no_task, addr)
137 #if (LINUX_VERSION_CODE != KERNEL_VERSION(2, 6, 11))
138 DECLARE_MOD_DEP_WRAPPER (follow_page, \
139 struct page *, struct vm_area_struct * vma, \
140 unsigned long address, unsigned int foll_flags)
141 IMP_MOD_DEP_WRAPPER (follow_page, vma, address, foll_flags)
143 DECLARE_MOD_DEP_WRAPPER (__flush_anon_page, \
144 void, struct vm_area_struct *vma, \
145 struct page *page, unsigned long vmaddr)
146 IMP_MOD_DEP_WRAPPER (__flush_anon_page, vma, page, vmaddr)
148 DECLARE_MOD_DEP_WRAPPER(vm_normal_page, \
149 struct page *, struct vm_area_struct *vma, \
150 unsigned long addr, pte_t pte)
151 IMP_MOD_DEP_WRAPPER (vm_normal_page, vma, addr, pte)
153 DECLARE_MOD_DEP_WRAPPER (flush_ptrace_access, \
154 void, struct vm_area_struct *vma, struct page *page, \
155 unsigned long uaddr, void *kaddr, unsigned long len, int write)
156 IMP_MOD_DEP_WRAPPER (flush_ptrace_access, vma, page, uaddr, kaddr, len, write)
158 DECLARE_MOD_DEP_WRAPPER(copy_to_user_page, void, struct vm_area_struct *vma, struct page *page, unsigned long uaddr, void *dst, const void *src, unsigned long len)
159 IMP_MOD_DEP_WRAPPER (copy_to_user_page, vma, page, uaddr, dst, src, len)
162 int init_module_dependencies()
165 #if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 29)
166 init_mm_ptr = (struct mm_struct*) kallsyms_search ("init_mm");
167 memcmp(init_mm_ptr, &init_mm, sizeof(struct mm_struct));
170 #if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18)
171 INIT_MOD_DEP_VAR(handle_mm_fault, handle_mm_fault);
174 INIT_MOD_DEP_VAR(flush_ptrace_access, flush_ptrace_access);
175 INIT_MOD_DEP_VAR(find_extend_vma, find_extend_vma);
176 INIT_MOD_DEP_VAR(get_gate_vma, get_gate_vma);
178 #ifdef CONFIG_HUGETLB_PAGE
179 INIT_MOD_DEP_VAR(follow_hugetlb_page, follow_hugetlb_page);
182 #ifdef __HAVE_ARCH_GATE_AREA
183 INIT_MOD_DEP_VAR(in_gate_area, in_gate_area);
185 INIT_MOD_DEP_VAR(in_gate_area_no_task, in_gate_area_no_task);
187 INIT_MOD_DEP_VAR(follow_page, follow_page);
189 INIT_MOD_DEP_VAR(__flush_anon_page, __flush_anon_page);
190 INIT_MOD_DEP_VAR(vm_normal_page, vm_normal_page);
191 INIT_MOD_DEP_VAR(access_process_vm, access_process_vm);
193 #if (LINUX_VERSION_CODE != KERNEL_VERSION(2, 6, 16))
194 # if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 11))
195 INIT_MOD_DEP_VAR(put_task_struct, put_task_struct);
197 INIT_MOD_DEP_VAR(put_task_struct, __put_task_struct);
200 INIT_MOD_DEP_VAR(put_task_struct, __put_task_struct_cb);
203 INIT_MOD_DEP_VAR(copy_to_user_page, copy_to_user_page);
208 #define GUP_FLAGS_WRITE 0x1
209 #define GUP_FLAGS_FORCE 0x2
210 #define GUP_FLAGS_IGNORE_VMA_PERMISSIONS 0x4
211 #define GUP_FLAGS_IGNORE_SIGKILL 0x8
213 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,18)
214 static inline int use_zero_page(struct vm_area_struct *vma)
217 * We don't want to optimize FOLL_ANON for make_pages_present()
218 * when it tries to page in a VM_LOCKED region. As to VM_SHARED,
219 * we want to get the page from the page tables to make sure
220 * that we serialize and update with any other user of that
223 if (vma->vm_flags & (VM_LOCKED | VM_SHARED))
226 * And if we have a fault routine, it's not an anonymous region.
228 return !vma->vm_ops || !vma->vm_ops->fault;
231 int __get_user_pages_uprobe(struct task_struct *tsk, struct mm_struct *mm,
232 unsigned long start, int len, int flags,
233 struct page **pages, struct vm_area_struct **vmas)
236 unsigned int vm_flags = 0;
237 int write = !!(flags & GUP_FLAGS_WRITE);
238 int force = !!(flags & GUP_FLAGS_FORCE);
239 int ignore = !!(flags & GUP_FLAGS_IGNORE_VMA_PERMISSIONS);
240 int ignore_sigkill = !!(flags & GUP_FLAGS_IGNORE_SIGKILL);
245 * Require read or write permissions.
246 * If 'force' is set, we only require the "MAY" flags.
248 vm_flags = write ? (VM_WRITE | VM_MAYWRITE) : (VM_READ | VM_MAYREAD);
249 vm_flags &= force ? (VM_MAYREAD | VM_MAYWRITE) : (VM_READ | VM_WRITE);
253 struct vm_area_struct *vma;
254 unsigned int foll_flags;
256 //vma = find_extend_vma(mm, start);
257 vma = find_vma(mm, start);
258 if (!vma && in_gate_area(tsk, start)) {
259 unsigned long pg = start & PAGE_MASK;
260 struct vm_area_struct *gate_vma = get_gate_vma(tsk);
266 /* user gate pages are read-only */
267 if (!ignore && write)
268 return i ? : -EFAULT;
270 pgd = pgd_offset_k(pg);
272 pgd = pgd_offset_gate(mm, pg);
273 BUG_ON(pgd_none(*pgd));
274 pud = pud_offset(pgd, pg);
275 BUG_ON(pud_none(*pud));
276 pmd = pmd_offset(pud, pg);
278 return i ? : -EFAULT;
279 pte = pte_offset_map(pmd, pg);
280 if (pte_none(*pte)) {
282 return i ? : -EFAULT;
285 struct page *page = vm_normal_page(gate_vma, start, *pte);
300 (vma->vm_flags & (VM_IO | VM_PFNMAP)) ||
301 (!ignore && !(vm_flags & vma->vm_flags)))
302 return i ? : -EFAULT;
304 if (is_vm_hugetlb_page(vma)) {
305 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
306 i = follow_hugetlb_page(mm, vma, pages, vmas,
309 i = follow_hugetlb_page(mm, vma, pages, vmas,
310 &start, &len, i, write);
315 foll_flags = FOLL_TOUCH;
317 foll_flags |= FOLL_GET;
319 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,18)
320 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,30)
321 if (!write && use_zero_page(vma))
322 foll_flags |= FOLL_ANON;
331 * If we have a pending SIGKILL, don't keep faulting
332 * pages and potentially allocating memory, unless
333 * current is handling munlock--e.g., on exit. In
334 * that case, we are not allocating memory. Rather,
335 * we're only unlocking already resident/mapped pages.
337 if (unlikely(!ignore_sigkill &&
338 fatal_signal_pending(current)))
339 return i ? i : -ERESTARTSYS;
343 foll_flags |= FOLL_WRITE;
348 DBPRINTF ("pages = %p vma = %p\n", pages, vma);
349 while (!(page = follow_page(vma, start, foll_flags))) {
351 ret = handle_mm_fault(mm, vma, start,
352 foll_flags & FOLL_WRITE);
354 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
355 if (ret & VM_FAULT_WRITE)
356 foll_flags &= ~FOLL_WRITE;
358 switch (ret & ~VM_FAULT_WRITE) {
365 case VM_FAULT_SIGBUS:
366 return i ? i : -EFAULT;
368 return i ? i : -ENOMEM;
374 if (ret & VM_FAULT_ERROR) {
375 if (ret & VM_FAULT_OOM)
376 return i ? i : -ENOMEM;
377 else if (ret & VM_FAULT_SIGBUS)
378 return i ? i : -EFAULT;
381 if (ret & VM_FAULT_MAJOR)
387 * The VM_FAULT_WRITE bit tells us that
388 * do_wp_page has broken COW when necessary,
389 * even if maybe_mkwrite decided not to set
390 * pte_write. We can thus safely do subsequent
391 * page lookups as if they were reads. But only
392 * do so when looping for pte_write is futile:
393 * in some cases userspace may also be wanting
394 * to write to the gotten user page, which a
395 * read fault here might prevent (a readonly
396 * page might get reCOWed by userspace write).
398 if ((ret & VM_FAULT_WRITE) &&
399 !(vma->vm_flags & VM_WRITE))
400 foll_flags &= ~FOLL_WRITE;
408 return i ? i : PTR_ERR(page);
412 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
413 flush_anon_page(page, start);
415 flush_anon_page(vma, page, start);
417 flush_dcache_page(page);
424 } while (len && start < vma->vm_end);
431 int get_user_pages_uprobe(struct task_struct *tsk, struct mm_struct *mm,
432 unsigned long start, int len, int write, int force,
433 struct page **pages, struct vm_area_struct **vmas)
435 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 29)
439 flags |= GUP_FLAGS_WRITE;
441 flags |= GUP_FLAGS_FORCE;
443 return __get_user_pages_uprobe(tsk, mm,
447 return get_user_pages(tsk, mm, start, len, write, force, pages, vmas);
452 int access_process_vm_atomic(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write)
454 struct mm_struct *mm;
455 struct vm_area_struct *vma;
457 unsigned long addr1 = addr;
458 unsigned int* inst_buf = (unsigned int*)old_buf;
461 mm = get_task_mm(tsk);
465 down_read(&mm->mmap_sem);
466 /* ignore errors, just check how much was successfully transferred */
468 int bytes, ret, offset;
470 struct page *page = NULL;
472 ret = get_user_pages_uprobe(tsk, mm, addr, 1,
473 write, 1, &page, &vma);
477 * Check if this is a VM_IO | VM_PFNMAP VMA, which
478 * we can access using slightly different code.
480 #ifdef CONFIG_HAVE_IOREMAP_PROT
481 vma = find_vma(mm, addr);
484 if (vma->vm_ops && vma->vm_ops->access)
485 ret = vma->vm_ops->access(vma, addr, buf,
493 offset = addr & (PAGE_SIZE-1);
494 if (bytes > PAGE_SIZE-offset)
495 bytes = PAGE_SIZE-offset;
499 copy_to_user_page(vma, page, addr,
500 maddr + offset, buf, bytes);
501 set_page_dirty_lock(page);
503 copy_from_user_page(vma, page, addr,
504 buf, maddr + offset, bytes);
507 page_cache_release(page);
513 up_read(&mm->mmap_sem);
516 return buf - old_buf;
519 int page_present (struct mm_struct *mm, unsigned long address)
527 pgd = pgd_offset(mm, address);
528 if (pgd_none(*pgd) || unlikely(pgd_bad(*pgd)))
531 pud = pud_offset(pgd, address);
532 if (pud_none(*pud) || unlikely(pud_bad(*pud)))
535 pmd = pmd_offset(pud, address);
536 if (pmd_none(*pmd) || unlikely(pmd_bad(*pmd)))
539 ptep = pte_offset_map(pmd, address);
545 if (pte_present(pte)) {
547 if (pfn_valid(pfn)) {
557 EXPORT_SYMBOL_GPL (page_present);
558 EXPORT_SYMBOL_GPL (get_user_pages_uprobe);
559 EXPORT_SYMBOL_GPL (access_process_vm_atomic);