* [uml-devel] Re: host and uml kernel with grsec
2004-06-28 21:32 [uml-devel] host and uml kernel with grsec Tom Rottler
@ 2004-06-28 21:36 ` Tom Rottler
2004-06-29 18:31 ` [uml-devel] " BlaisorBlade
1 sibling, 0 replies; 3+ messages in thread
From: Tom Rottler @ 2004-06-28 21:36 UTC (permalink / raw)
To: user-mode-linux-devel
[-- Attachment #1: Type: text/plain, Size: 122 bytes --]
* Tom Rottler [Mon, 2004 Jun 28 23:32:32 +0200]:
... I'm sorry, I forgot to attach te file. :-(
Here it is!
Regards: Tom
[-- Attachment #2: host-skas3-2.4.26-grsec-2.0.patch --]
[-- Type: text/plain, Size: 18301 bytes --]
diff -ruN linux-2.4.26-grsec-2.0/Makefile linux-2.4.26-grsec-2.0-skas3/Makefile
--- linux-2.4.26-grsec-2.0/Makefile Mon Jun 28 21:22:42 2004
+++ linux-2.4.26-grsec-2.0-skas3/Makefile Mon Jun 28 21:35:47 2004
@@ -1,7 +1,7 @@
VERSION = 2
PATCHLEVEL = 4
SUBLEVEL = 26
-EXTRAVERSION = -grsec
+EXTRAVERSION = -grsec-skas-2
KERNELRELEASE=$(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
diff -ruN linux-2.4.26-grsec-2.0/arch/i386/kernel/ldt.c linux-2.4.26-grsec-2.0-skas3/arch/i386/kernel/ldt.c
--- linux-2.4.26-grsec-2.0/arch/i386/kernel/ldt.c Mon Jun 28 21:22:42 2004
+++ linux-2.4.26-grsec-2.0-skas3/arch/i386/kernel/ldt.c Mon Jun 28 20:41:40 2004
@@ -53,7 +53,7 @@
wmb();
pc->ldt = newldt;
pc->size = mincount;
- if (reload) {
+ if (reload && (¤t->active_mm->context == pc)) {
load_LDT(pc);
#ifdef CONFIG_SMP
if (current->mm->cpu_vm_mask != (1<<smp_processor_id()))
@@ -86,14 +86,12 @@
* we do not have to muck with descriptors here, that is
* done in switch_mm() as needed.
*/
-int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
+int __init_new_context(struct mm_struct *old_mm, struct mm_struct *mm)
{
- struct mm_struct * old_mm;
int retval = 0;
init_MUTEX(&mm->context.sem);
mm->context.size = 0;
- old_mm = current->mm;
if (old_mm && old_mm->context.size > 0) {
down(&old_mm->context.sem);
retval = copy_ldt(&mm->context, &old_mm->context);
@@ -102,6 +100,10 @@
return retval;
}
+int init_new_context(struct task_struct *tsk, struct mm_struct *mm) {
+ return __init_new_context(current->mm, mm);
+}
+
/*
* No need to lock the MM as we are the last user
* Do not touch the ldt register, we are already
@@ -118,11 +120,10 @@
}
}
-static int read_ldt(void * ptr, unsigned long bytecount)
+static int read_ldt(struct mm_struct * mm, void * ptr, unsigned long bytecount)
{
int err;
unsigned long size;
- struct mm_struct * mm = current->mm;
if (!mm->context.size)
return 0;
@@ -166,9 +167,8 @@
return err;
}
-static int write_ldt(void * ptr, unsigned long bytecount, int oldmode)
+static int write_ldt(struct mm_struct * mm, void * ptr, unsigned long bytecount, int oldmode)
{
- struct mm_struct * mm = current->mm;
__u32 entry_1, entry_2, *lp;
int error;
struct modify_ldt_ldt_s ldt_info;
@@ -192,7 +192,7 @@
down(&mm->context.sem);
if (ldt_info.entry_number >= mm->context.size) {
- error = alloc_ldt(¤t->mm->context, ldt_info.entry_number+1, 1);
+ error = alloc_ldt(&mm->context, ldt_info.entry_number+1, 1);
if (error < 0)
goto out_unlock;
}
@@ -247,23 +247,27 @@
return error;
}
-asmlinkage int sys_modify_ldt(int func, void *ptr, unsigned long bytecount)
+int modify_ldt(struct mm_struct * mm, int func, void *ptr, unsigned long bytecount)
{
int ret = -ENOSYS;
switch (func) {
case 0:
- ret = read_ldt(ptr, bytecount);
+ ret = read_ldt(mm, ptr, bytecount);
break;
case 1:
- ret = write_ldt(ptr, bytecount, 1);
+ ret = write_ldt(mm, ptr, bytecount, 1);
break;
case 2:
ret = read_default_ldt(ptr, bytecount);
break;
case 0x11:
- ret = write_ldt(ptr, bytecount, 0);
+ ret = write_ldt(mm, ptr, bytecount, 0);
break;
}
return ret;
+}
+
+asmlinkage int sys_modify_ldt(int func, void *ptr, unsigned long bytecount) {
+ return modify_ldt(current->mm, func, ptr, bytecount);
}
diff -ruN linux-2.4.26-grsec-2.0/arch/i386/kernel/ptrace.c linux-2.4.26-grsec-2.0-skas3/arch/i386/kernel/ptrace.c
--- linux-2.4.26-grsec-2.0/arch/i386/kernel/ptrace.c Mon Jun 28 21:22:42 2004
+++ linux-2.4.26-grsec-2.0-skas3/arch/i386/kernel/ptrace.c Mon Jun 28 20:41:40 2004
@@ -148,6 +148,11 @@
put_stack_long(child, EFL_OFFSET, tmp);
}
+extern int modify_ldt(struct mm_struct *mm, int func, void *ptr,
+ unsigned long bytecount);
+
+extern struct mm_struct *proc_mm_get_mm(int fd);
+
asmlinkage int sys_ptrace(long request, long pid, long addr, long data)
{
struct task_struct *child;
@@ -433,6 +438,53 @@
ret = 0;
break;
}
+
+ case PTRACE_FAULTINFO: {
+ struct ptrace_faultinfo fault;
+
+ fault = ((struct ptrace_faultinfo)
+ { .is_write = child->thread.error_code,
+ .addr = child->thread.cr2 });
+ ret = copy_to_user((unsigned long *) data, &fault,
+ sizeof(fault));
+ break;
+ }
+ case PTRACE_SIGPENDING:
+ ret = copy_to_user((unsigned long *) data,
+ &child->pending.signal,
+ sizeof(child->pending.signal));
+ break;
+
+ case PTRACE_LDT: {
+ struct ptrace_ldt ldt;
+
+ if(copy_from_user(&ldt, (unsigned long *) data,
+ sizeof(ldt))){
+ ret = -EIO;
+ break;
+ }
+ ret = modify_ldt(child->mm, ldt.func, ldt.ptr, ldt.bytecount);
+ break;
+ }
+
+#if 1 /* CONFIG_PROC_MM*/
+ case PTRACE_SWITCH_MM: {
+ struct mm_struct *old = child->mm;
+ struct mm_struct *new = proc_mm_get_mm(data);
+
+ if(IS_ERR(new)){
+ ret = PTR_ERR(new);
+ break;
+ }
+
+ atomic_inc(&new->mm_users);
+ child->mm = new;
+ child->active_mm = new;
+ mmput(old);
+ ret = 0;
+ break;
+ }
+#endif
default:
ret = -EIO;
diff -ruN linux-2.4.26-grsec-2.0/arch/i386/kernel/sys_i386.c linux-2.4.26-grsec-2.0-skas3/arch/i386/kernel/sys_i386.c
--- linux-2.4.26-grsec-2.0/arch/i386/kernel/sys_i386.c Mon Jun 28 21:22:42 2004
+++ linux-2.4.26-grsec-2.0-skas3/arch/i386/kernel/sys_i386.c Mon Jun 28 20:51:44 2004
@@ -41,7 +41,7 @@
}
/* common code for old and new mmaps */
-static inline long do_mmap2(
+long do_mmap2(struct mm_struct *mm,
unsigned long addr, unsigned long len,
unsigned long prot, unsigned long flags,
unsigned long fd, unsigned long pgoff)
@@ -67,9 +67,9 @@
goto out;
}
- down_write(¤t->mm->mmap_sem);
- error = do_mmap(file, addr, len, prot, flags, pgoff << PAGE_SHIFT);
- up_write(¤t->mm->mmap_sem);
+ down_write(&mm->mmap_sem);
+ error = tf_do_mmap_skasgrsec(mm,file, addr, len, prot, flags, pgoff << PAGE_SHIFT);
+ up_write(&mm->mmap_sem);
if (file)
fput(file);
@@ -81,7 +81,7 @@
unsigned long prot, unsigned long flags,
unsigned long fd, unsigned long pgoff)
{
- return do_mmap2(addr, len, prot, flags, fd, pgoff);
+ return do_mmap2(current->mm, addr, len, prot, flags, fd, pgoff);
}
/*
@@ -112,7 +112,7 @@
if (a.offset & ~PAGE_MASK)
goto out;
- err = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
+ err = do_mmap2(current->mm, a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
out:
return err;
}
diff -ruN linux-2.4.26-grsec-2.0/include/asm-i386/processor.h linux-2.4.26-grsec-2.0-skas3/include/asm-i386/processor.h
--- linux-2.4.26-grsec-2.0/include/asm-i386/processor.h Mon Jun 28 21:22:42 2004
+++ linux-2.4.26-grsec-2.0-skas3/include/asm-i386/processor.h Mon Jun 28 21:39:35 2004
@@ -442,6 +442,8 @@
static inline void copy_segments(struct task_struct *p, struct mm_struct * mm) { }
static inline void release_segments(struct mm_struct * mm) { }
+extern int __init_new_context(struct mm_struct *old_mm, struct mm_struct *mm);
+
/*
* Return saved PC of a blocked thread.
*/
diff -ruN linux-2.4.26-grsec-2.0/include/asm-i386/ptrace.h linux-2.4.26-grsec-2.0-skas3/include/asm-i386/ptrace.h
--- linux-2.4.26-grsec-2.0/include/asm-i386/ptrace.h Fri Sep 14 23:04:08 2001
+++ linux-2.4.26-grsec-2.0-skas3/include/asm-i386/ptrace.h Mon Jun 28 20:41:40 2004
@@ -51,6 +51,22 @@
#define PTRACE_SETOPTIONS 21
+struct ptrace_faultinfo {
+ int is_write;
+ unsigned long addr;
+};
+
+struct ptrace_ldt {
+ int func;
+ void *ptr;
+ unsigned long bytecount;
+};
+
+#define PTRACE_FAULTINFO 52
+#define PTRACE_SIGPENDING 53
+#define PTRACE_LDT 54
+#define PTRACE_SWITCH_MM 55
+
/* options set using PTRACE_SETOPTIONS */
#define PTRACE_O_TRACESYSGOOD 0x00000001
diff -ruN linux-2.4.26-grsec-2.0/include/linux/mm.h linux-2.4.26-grsec-2.0-skas3/include/linux/mm.h
--- linux-2.4.26-grsec-2.0/include/linux/mm.h Mon Jun 28 21:22:42 2004
+++ linux-2.4.26-grsec-2.0-skas3/include/linux/mm.h Mon Jun 28 21:40:29 2004
@@ -537,6 +537,9 @@
int get_user_pages(struct task_struct *tsk, struct mm_struct *mm, unsigned long start,
int len, int write, int force, struct page **pages, struct vm_area_struct **vmas);
+extern long do_mprotect(struct mm_struct *mm, unsigned long start,
+ size_t len, unsigned long prot);
+
/*
* On a two-level page table, this ends up being trivial. Thus the
* inlining and the symmetry break with pte_alloc() that does all
@@ -584,9 +587,10 @@
extern unsigned long get_unmapped_area(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
-extern unsigned long do_mmap_pgoff(struct file *file, unsigned long addr,
- unsigned long len, unsigned long prot,
- unsigned long flag, unsigned long pgoff);
+extern unsigned long do_mmap_pgoff(struct mm_struct *mm,
+ struct file *file, unsigned long addr,
+ unsigned long len, unsigned long prot,
+ unsigned long flag, unsigned long pgoff);
extern int do_munmap(struct mm_struct *, unsigned long, size_t);
@@ -605,10 +609,11 @@
if ((offset + PAGE_ALIGN(len)) < offset)
goto out;
if (!(offset & ~PAGE_MASK))
- ret = do_mmap_pgoff(file, addr, len, prot, flag, offset >> PAGE_SHIFT);
+ ret = do_mmap_pgoff(current->mm, file, addr, len, prot, flag, offset >> PAGE_SHIFT);
#ifdef CONFIG_GRKERNSEC_PAX_SEGMEXEC
- if ((current->flags & PF_PAX_SEGMEXEC) && ret < TASK_SIZE && ((flag & MAP_TYPE) == MAP_PRIVATE)
+#define BAD_ADDR(x)> ((unsigned long)(x) > TASK_SIZE)
+ if ((current->flags & PF_PAX_SEGMEXEC) && !BAD_ADDR(ret) && ((flag & MAP_TYPE) == MAP_PRIVATE)
#ifdef CONFIG_GRKERNSEC_PAX_MPROTECT
&& (!(current->flags & PF_PAX_MPROTECT) || ((prot & PROT_EXEC) && file && !(prot & PROT_WRITE)))
@@ -618,11 +623,55 @@
unsigned long ret_m;
prot = prot & PROT_EXEC ? prot : PROT_NONE;
ret_m = do_mmap_pgoff(NULL, ret + SEGMEXEC_TASK_SIZE, 0UL, prot, flag | MAP_MIRROR | MAP_FIXED, ret);
- if (ret_m >= TASK_SIZE) {
+ if (BAD_ADDR(ret_m)) {
do_munmap(current->mm, ret, len);
ret = ret_m;
}
}
+#undef BAD_ADDR
+#endif
+
+out:
+ return ret;
+}
+
+/* T.F. */
+static inline unsigned long tf_do_mmap_skasgrsec(struct mm_struct *mm,
+ struct file *file, unsigned long addr,
+ unsigned long len, unsigned long prot,
+ unsigned long flag, unsigned long offset)
+{
+ unsigned long ret = -EINVAL;
+
+#ifdef CONFIG_GRKERNSEC_PAX_SEGMEXEC
+ if ((current->flags & PF_PAX_SEGMEXEC) &&
+ (len > SEGMEXEC_TASK_SIZE || (addr && addr > SEGMEXEC_TASK_SIZE-len)))
+ goto out;
+#endif
+
+ if ((offset + PAGE_ALIGN(len)) < offset)
+ goto out;
+ if (!(offset & ~PAGE_MASK))
+ ret = do_mmap_pgoff(mm, file, addr, len, prot, flag, offset >> PAGE_SHIFT);
+
+#ifdef CONFIG_GRKERNSEC_PAX_SEGMEXEC
+#define BAD_ADDR(x)> ((unsigned long)(x) > TASK_SIZE)
+ if ((current->flags & PF_PAX_SEGMEXEC) && !BAD_ADDR(ret) && ((flag & MAP_TYPE) == MAP_PRIVATE)
+
+#ifdef CONFIG_GRKERNSEC_PAX_MPROTECT
+ && (!(current->flags & PF_PAX_MPROTECT) || ((prot & PROT_EXEC) && file && !(prot & PROT_WRITE)))
+#endif
+ )
+ {
+ unsigned long ret_m;
+ prot = prot & PROT_EXEC ? prot : PROT_NONE;
+ ret_m = do_mmap_pgoff(mm, NULL, ret + SEGMEXEC_TASK_SIZE, 0UL, prot, flag | MAP_MIRROR | MAP_FIXED, ret);
+ if (BAD_ADDR(ret_m)) {
+ do_munmap(mm, ret, len);
+ ret = ret_m;
+ }
+ }
+#undef BAD_ADDR
#endif
out:
diff -ruN linux-2.4.26-grsec-2.0/include/linux/proc_mm.h linux-2.4.26-grsec-2.0-skas3/include/linux/proc_mm.h
--- linux-2.4.26-grsec-2.0/include/linux/proc_mm.h Thu Jan 1 01:00:00 1970
+++ linux-2.4.26-grsec-2.0-skas3/include/linux/proc_mm.h Mon Jun 28 20:41:40 2004
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __PROC_MM_H
+#define __PROC_MM_H
+
+#define MM_MMAP 54
+#define MM_MUNMAP 55
+#define MM_MPROTECT 56
+#define MM_COPY_SEGMENTS 57
+
+struct mm_mmap {
+ unsigned long addr;
+ unsigned long len;
+ unsigned long prot;
+ unsigned long flags;
+ unsigned long fd;
+ unsigned long offset;
+};
+
+struct mm_munmap {
+ unsigned long addr;
+ unsigned long len;
+};
+
+struct mm_mprotect {
+ unsigned long addr;
+ unsigned long len;
+ unsigned int prot;
+};
+
+struct proc_mm_op {
+ int op;
+ union {
+ struct mm_mmap mmap;
+ struct mm_munmap munmap;
+ struct mm_mprotect mprotect;
+ int copy_segments;
+ } u;
+};
+
+#endif
diff -ruN linux-2.4.26-grsec-2.0/mm/Makefile linux-2.4.26-grsec-2.0-skas3/mm/Makefile
--- linux-2.4.26-grsec-2.0/mm/Makefile Sat Aug 3 02:39:46 2002
+++ linux-2.4.26-grsec-2.0-skas3/mm/Makefile Mon Jun 28 20:41:40 2004
@@ -17,5 +17,7 @@
shmem.o
obj-$(CONFIG_HIGHMEM) += highmem.o
+#obj-$(CONFIG_PROC_MM)
+obj-y += proc_mm.o
include $(TOPDIR)/Rules.make
diff -ruN linux-2.4.26-grsec-2.0/mm/mmap.c linux-2.4.26-grsec-2.0-skas3/mm/mmap.c
--- linux-2.4.26-grsec-2.0/mm/mmap.c Mon Jun 28 21:22:42 2004
+++ linux-2.4.26-grsec-2.0-skas3/mm/mmap.c Mon Jun 28 20:41:40 2004
@@ -399,10 +399,11 @@
return 0;
}
-unsigned long do_mmap_pgoff(struct file * file, unsigned long addr, unsigned long len,
- unsigned long prot, unsigned long flags, unsigned long pgoff)
+unsigned long do_mmap_pgoff(struct mm_struct *mm, struct file * file,
+ unsigned long addr, unsigned long len,
+ unsigned long prot, unsigned long flags,
+ unsigned long pgoff)
{
- struct mm_struct * mm = current->mm;
struct vm_area_struct * vma, * prev;
unsigned int vm_flags;
int correct_wcount = 0;
diff -ruN linux-2.4.26-grsec-2.0/mm/mprotect.c linux-2.4.26-grsec-2.0-skas3/mm/mprotect.c
--- linux-2.4.26-grsec-2.0/mm/mprotect.c Mon Jun 28 21:22:42 2004
+++ linux-2.4.26-grsec-2.0-skas3/mm/mprotect.c Mon Jun 28 20:45:13 2004
@@ -378,7 +378,8 @@
}
#endif
-asmlinkage long sys_mprotect(unsigned long start, size_t len, unsigned long prot)
+long do_mprotect(struct mm_struct *mm, unsigned long start, size_t len,
+ unsigned long prot)
{
unsigned long nstart, end, tmp;
struct vm_area_struct * vma, * next, * prev;
@@ -406,9 +407,9 @@
if (end == start)
return 0;
- down_write(¤t->mm->mmap_sem);
+ down_write(&mm->mmap_sem);
- vma = find_vma_prev(current->mm, start, &prev);
+ vma = find_vma_prev(mm, start, &prev);
error = -ENOMEM;
if (!vma || vma->vm_start > start)
goto out;
@@ -473,7 +474,12 @@
prev->vm_mm->map_count--;
}
out:
-
- up_write(¤t->mm->mmap_sem);
+ up_write(&mm->mmap_sem);
return error;
}
+
+asmlinkage long sys_mprotect(unsigned long start, size_t len, unsigned long prot)
+{
+ return(do_mprotect(current->mm, start, len, prot));
+}
+
diff -ruN linux-2.4.26-grsec-2.0/mm/proc_mm.c linux-2.4.26-grsec-2.0-skas3/mm/proc_mm.c
--- linux-2.4.26-grsec-2.0/mm/proc_mm.c Thu Jan 1 01:00:00 1970
+++ linux-2.4.26-grsec-2.0-skas3/mm/proc_mm.c Mon Jun 28 20:41:40 2004
@@ -0,0 +1,174 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/proc_fs.h"
+#include "linux/proc_mm.h"
+#include "linux/file.h"
+#include "asm/uaccess.h"
+#include "asm/mmu_context.h"
+
+static struct file_operations proc_mm_fops;
+
+struct mm_struct *proc_mm_get_mm(int fd)
+{
+ struct mm_struct *ret = ERR_PTR(-EBADF);
+ struct file *file;
+
+ file = fget(fd);
+ if (!file)
+ goto out;
+
+ ret = ERR_PTR(-EINVAL);
+ if(file->f_op != &proc_mm_fops)
+ goto out_fput;
+
+ ret = file->private_data;
+
+ out_fput:
+ fput(file);
+ out:
+ return(ret);
+}
+
+extern long do_mmap2(struct mm_struct *mm, unsigned long addr,
+ unsigned long len, unsigned long prot,
+ unsigned long flags, unsigned long fd,
+ unsigned long pgoff);
+
+static ssize_t write_proc_mm(struct file *file, const char *buffer,
+ size_t count, loff_t *ppos)
+{
+ struct mm_struct *mm = file->private_data;
+ struct proc_mm_op req;
+ int n, ret;
+
+ if(count > sizeof(req))
+ return(-EINVAL);
+
+ n = copy_from_user(&req, buffer, count);
+ if(n != 0)
+ return(-EFAULT);
+
+ ret = count;
+ switch(req.op){
+ case MM_MMAP: {
+ struct mm_mmap *map = &req.u.mmap;
+
+ ret = do_mmap2(mm, map->addr, map->len, map->prot,
+ map->flags, map->fd, map->offset >> PAGE_SHIFT);
+ if((ret & ~PAGE_MASK) == 0)
+ ret = count;
+
+ break;
+ }
+ case MM_MUNMAP: {
+ struct mm_munmap *unmap = &req.u.munmap;
+
+ down_write(&mm->mmap_sem);
+ ret = do_munmap(mm, unmap->addr, unmap->len);
+ up_write(&mm->mmap_sem);
+
+ if(ret == 0)
+ ret = count;
+ break;
+ }
+ case MM_MPROTECT: {
+ struct mm_mprotect *protect = &req.u.mprotect;
+
+ ret = do_mprotect(mm, protect->addr, protect->len,
+ protect->prot);
+ if(ret == 0)
+ ret = count;
+ break;
+ }
+
+ case MM_COPY_SEGMENTS: {
+ struct mm_struct *from = proc_mm_get_mm(req.u.copy_segments);
+
+ if(IS_ERR(from)){
+ ret = PTR_ERR(from);
+ break;
+ }
+
+ /*mm_copy_segments(from, mm);*/
+ __init_new_context(from, mm);
+ break;
+ }
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ return(ret);
+}
+
+static int open_proc_mm(struct inode *inode, struct file *file)
+{
+ struct mm_struct *mm = mm_alloc();
+ int ret;
+
+ ret = -ENOMEM;
+ if(mm == NULL)
+ goto out_mem;
+
+ ret = init_new_context(current, mm);
+ if(ret)
+ goto out_free;
+
+ spin_lock(&mmlist_lock);
+ list_add(&mm->mmlist, ¤t->mm->mmlist);
+ mmlist_nr++;
+ spin_unlock(&mmlist_lock);
+
+ file->private_data = mm;
+
+ return(0);
+
+ out_free:
+ mmput(mm);
+ out_mem:
+ return(ret);
+}
+
+static int release_proc_mm(struct inode *inode, struct file *file)
+{
+ struct mm_struct *mm = file->private_data;
+
+ mmput(mm);
+ return(0);
+}
+
+static struct file_operations proc_mm_fops = {
+ .open = open_proc_mm,
+ .release = release_proc_mm,
+ .write = write_proc_mm,
+};
+
+static int make_proc_mm(void)
+{
+ struct proc_dir_entry *ent;
+
+ ent = create_proc_entry("mm", 0222, &proc_root);
+ if(ent == NULL){
+ printk("make_proc_mm : Failed to register /proc/mm\n");
+ return(0);
+ }
+ ent->proc_fops = &proc_mm_fops;
+
+ return(0);
+}
+
+__initcall(make_proc_mm);
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
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