/usr/src/blcr-0.8.5/vmadump4/vmadump_common.c is in blcr-dkms 0.8.5-2.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 | /*-------------------------------------------------------------------------
* vmadump.c: Virtual Memory Area dump/restore routines
*
* Copyright (C) 1999-2001 by Erik Hendriks <erik@hendriks.cx>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* $Id: vmadump_common.c,v 1.86.4.14 2013/01/29 20:17:11 phargrov Exp $
*
* THIS VERSION MODIFIED FOR BLCR <http://ftg.lbl.gov/checkpoint>
*-----------------------------------------------------------------------*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/version.h>
#include "blcr_config.h"
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/file.h>
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/binfmts.h>
#if !HAVE_FILE_F_LOCK
#include <linux/smp_lock.h>
#endif
#include <linux/unistd.h>
#include <linux/personality.h>
#include <linux/highmem.h>
#include <linux/ptrace.h>
#include <linux/init.h>
#include <linux/prctl.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/processor.h>
#include <asm/uaccess.h>
#include <asm/bitops.h>
#define __VMADUMP_INTERNAL__
#include "vmadump.h"
static char vmad_magic[3] = VMAD_MAGIC;
MODULE_AUTHOR("Erik Hendriks <erik@hendriks.cx> and the BLCR Team http://ftg.lbl.gov/checkpoint");
MODULE_DESCRIPTION("VMADump - Virtual Memory Area Dumper (modified for " PACKAGE_STRING ")");
MODULE_LICENSE("GPL");
/* A note about symbols...
*
* This module requires the following extra symbols from the kernel:
*
* sys_mprotect
* do_exit
* do_sigaction
* do_execve
* [and more w/ BLCR...]
*/
# if 0 /* BLCR uses its own I/O paths instead */
/*--------------------------------------------------------------------
* Some utility stuff for reading and writing and misc kernel syscalls.
*------------------------------------------------------------------*/
static
ssize_t default_read_file(struct vmadump_map_ctx *ctx, struct file *file,
void *buf, size_t count) {
return vfs_read(file, buf, count, &file->f_pos);
}
static
ssize_t read_user(struct vmadump_map_ctx *ctx,
struct file *file, void *buf, size_t count) {
ssize_t r, bytes = count;
ssize_t (*rfunc)(struct vmadump_map_ctx *ctx, struct file *file,
void *buf, size_t count);
rfunc = (ctx && ctx->read_file) ? ctx->read_file : default_read_file;
while (bytes) {
#if BITS_PER_LONG == 32
/* Avoid accidentally negative return values */
r = rfunc(ctx, file, buf, ((bytes > 0x40000000) ? 0x40000000 : bytes));
#elif BITS_PER_LONG == 64
r = rfunc(ctx, file, buf, bytes);
#else
#error "Unknown BITS_PER_LONG"
#endif
if (r < 0) return r;
if (r == 0) return count - bytes;
bytes -= r; buf = (char *)buf + r;
}
return count;
}
ssize_t read_kern(struct vmadump_map_ctx *ctx,
struct file *file, void *buf, size_t count) {
ssize_t err;
mm_segment_t oldfs;
oldfs = get_fs(); set_fs(KERNEL_DS);
err = read_user(ctx, file, buf, count);
set_fs(oldfs);
return err;
}
static
ssize_t default_write_file(struct vmadump_map_ctx *ctx, struct file *file,
const void *buf, size_t count) {
return vfs_write(file, buf, count, &file->f_pos);
}
static
ssize_t write_user(struct vmadump_map_ctx *ctx, struct file *file,
const void *buf, size_t count) {
ssize_t w, bytes = count;
ssize_t (*wfunc)(struct vmadump_map_ctx *ctx, struct file *file,
const void *buf, size_t count);
wfunc = (ctx && ctx->write_file) ? ctx->write_file : default_write_file;
while (bytes) {
#if BITS_PER_LONG == 32
/* Avoid accidentally negative return values */
w = wfunc(ctx, file, buf, ((bytes > 0x40000000) ? 0x40000000 : bytes));
#elif BITS_PER_LONG == 64
w = wfunc(ctx, file, buf, bytes);
#else
#error "Unknown BITS_PER_LONG"
#endif
if (w < 0) return w;
if (w == 0) return count - bytes;
bytes -= w; buf = (char *)buf + w;
}
return count;
}
ssize_t write_kern(struct vmadump_map_ctx *ctx, struct file *file,
const void *buf, size_t count) {
ssize_t err;
mm_segment_t oldfs;
oldfs = get_fs(); set_fs(KERNEL_DS);
err = write_user(ctx, file, buf, count);
set_fs(oldfs);
return err;
}
#endif
#if 0 /* Not needed/maintained for BLCR */
/*--------------------------------------------------------------------
* Library list stuff.
*------------------------------------------------------------------*/
/* XXX This should be more configurable than this - this is idea of
* figuring out what's a library */
struct liblist_entry {
struct list_head list;
char libname[0];
};
static LIST_HEAD(liblist);
static
void liblist_clear(void) {
struct liblist_entry *entry;
while (!list_empty(&liblist)) {
entry = list_entry(liblist.next, struct liblist_entry, list);
list_del(liblist.next);
kfree(entry);
}
}
static
struct liblist_entry *
liblist_find(const char *filename) {
struct list_head *p;
struct liblist_entry *entry;
p = liblist.next;
while (p != &liblist) {
entry = list_entry(p, struct liblist_entry, list);
if (strcmp(entry->libname, filename) == 0)
return entry;
p = p->next;
}
return 0;
}
static
int liblist_add(char *filename) {
struct liblist_entry *entry;
/* Don't add things twice */
if (liblist_find(filename)) return 0;
entry = kmalloc(sizeof(*entry)+strlen(filename)+1, GFP_KERNEL);
if (!entry) return -ENOMEM;
strcpy(entry->libname, filename);
list_add(&entry->list, &liblist);
return 0;
}
static
int liblist_del(char *filename) {
struct liblist_entry *entry;
entry = liblist_find(filename);
if (entry) {
list_del(&entry->list);
kfree(entry);
return 0;
}
return -ENOENT;
}
/* Returns the size of our library list converted to text */
static
int liblist_size(void) {
int len;
struct list_head *p;
struct liblist_entry *entry;
len = 0;
p = liblist.next;
while (p != &liblist) {
entry = list_entry(p, struct liblist_entry, list);
len += strlen(entry->libname)+1;
p = p->next;
}
len++; /* for trailing null. */
return len;
}
static
int do_lib_op(int request, char *buf, int size) {
int err, len;
char *filename;
struct list_head *p;
struct liblist_entry *entry;
switch(request) {
case VMAD_LIB_CLEAR:
if (!capable(CAP_SYS_ADMIN)) return -EPERM;
liblist_clear();
return 0;
case VMAD_LIB_ADD:
if (!capable(CAP_SYS_ADMIN)) return -EPERM;
filename = getname(buf);
if (IS_ERR(filename)) return PTR_ERR(filename);
err = liblist_add(filename);
putname(filename);
return err;
case VMAD_LIB_DEL:
if (!capable(CAP_SYS_ADMIN)) return -EPERM;
filename = getname(buf);
if (IS_ERR(filename)) return PTR_ERR(filename);
err = liblist_del(filename);
putname(filename);
return err;
case VMAD_LIB_SIZE:
return liblist_size();
case VMAD_LIB_LIST:
len = liblist_size();
if (len > size) return -ENOSPC;
size = len;
/* Copy all those strings out to user space. */
p = liblist.next;
while (p != &liblist) {
entry = list_entry(p, struct liblist_entry, list);
len = strlen(entry->libname);
if (copy_to_user(buf, entry->libname, len)) return EFAULT;
buf += len;
put_user('\0', buf++);
p = p->next;
}
put_user('\0', buf);
return size;
default:
return -EINVAL;
}
}
#endif
static
char *default_map_name(struct file *f, char *buffer, int size) {
#if HAVE_NAMEIDATA_DENTRY
return d_path(f->f_dentry, f->f_vfsmnt, buffer, size);
#elif HAVE_NAMEIDATA_PATH
return d_path(&f->f_path, buffer, size);
#else
#error
#endif
}
#if 0 /* Not needed/maintained for BLCR */
/* this is gonna be handled with contexts too */
static
int is_library(const char *filename) {
return (liblist_find(filename) != 0);
}
#else
#define is_library(FILE) 0
#endif
static
struct file *default_map_open(cr_rstrt_proc_req_t *ctx, const char *filename, int flags)
{
struct file *filp;
const char *reloc_filename;
reloc_filename = cr_relocate_path(ctx->req->relocate, filename, 0);
if (IS_ERR(reloc_filename)) {
filp = (struct file *)reloc_filename;
goto out;
}
filp = filp_open(reloc_filename, flags, 0);
if (IS_ERR(filp)) {
if (reloc_filename != filename) {
CR_ERR_CTX(ctx, "failed to open '%s', relocated from '%s'",
reloc_filename, filename);
}
/* Caller prints flags and return value */
}
if (reloc_filename != filename) {
__putname(reloc_filename);
}
out:
return filp;
}
#if 0 /* Hooks code not needed/maintained for BLCR */
/*--------------------------------------------------------------------
* Dump hook stuff.
*------------------------------------------------------------------*/
struct hook_t {
struct list_head list;
struct vmadump_hook *hook;
};
struct vmadump_hook_handle {
int rw; /* for checking on the user */
struct vmadump_map_ctx *ctx;
struct file *file;
};
static struct rw_semaphore hook_lock;
static LIST_HEAD(hooks);
int vmadump_add_hook(struct vmadump_hook *hook) {
struct hook_t *h, *new_h;
struct list_head *l;
new_h = kmalloc(sizeof(*new_h), GFP_KERNEL);
new_h->hook = hook;
down_write(&hook_lock);
/* check to make sure that this hook isn't being added twice */
for (l = hooks.next; l != &hooks; l = l->next) {
h = list_entry(l, struct hook_t, list);
if (h->hook == hook) {
up_write(&hook_lock);
kfree(new_h);
return -EEXIST;
}
}
list_add_tail(&new_h->list, &hooks);
up_write(&hook_lock);
printk(KERN_INFO "vmadump: Registered hook \"%s\"\n", hook->tag);
return 0;
}
int vmadump_del_hook(struct vmadump_hook *hook) {
struct hook_t *h;
struct list_head *l;
down_write(&hook_lock);
for (l = hooks.next; l != &hooks; l = l->next) {
h = list_entry(l, struct hook_t, list);
if (h->hook == hook) {
list_del(&h->list);
up_write(&hook_lock);
printk(KERN_INFO "vmadump: Unregistered hook \"%s\"\n", hook->tag);
kfree(h);
return 0;
}
}
up_write(&hook_lock);
return -ENOENT;
}
struct vmadump_callback_handle {
int rw;
struct vmadump_map_ctx *ctx;
struct file *file;
};
/* Call every hook freeze function */
static
int do_freeze_hooks(struct vmadump_map_ctx *ctx, struct file *file,
struct pt_regs *regs, int flags) {
long bytes = 0, r;
struct hook_t *h;
struct list_head *l;
struct vmadump_hook_header hookhdr;
struct vmadump_hook_handle hh = { 1, ctx, file};
down_read(&hook_lock);
for (l = hooks.next; l != &hooks; l = l->next) {
h = list_entry(l, struct hook_t, list);
r = h->hook->freeze(&hh, regs, flags);
if (r < 0) {
up_read(&hook_lock);
return r;
}
bytes += r;
}
up_read(&hook_lock);
/* Terminate the list of hooks */
memset(&hookhdr, 0, sizeof(hookhdr));
r = write_kern(ctx, file, &hookhdr, sizeof(hookhdr));
if (r < 0) return r;
if (r != sizeof(hookhdr)) return -EIO;
bytes += r;
return bytes;
}
static
long skip_data(struct vmadump_map_ctx *ctx, struct file *file, long len) {
long r = 0;
void *page;
page = (void *) __get_free_page(GFP_KERNEL);
if (!page)
return -ENOMEM;
while (len > 0) {
r = read_kern(ctx, file, page, (len>PAGE_SIZE) ? PAGE_SIZE : len);
if (r <= 0) break;
len -= r;
}
free_page((long) page);
if (r == 0) r = -EIO; /* end of file.... */
return 0;
}
static
int do_thaw_hooks(struct vmadump_map_ctx *ctx, struct file *file,
struct pt_regs *regs) {
long r;
struct hook_t *h;
struct list_head *l;
struct vmadump_hook_header hookhdr;
struct vmadump_hook_handle hh = { 0, ctx, file};
r = read_kern(ctx, file, &hookhdr, sizeof(hookhdr));
if (r != sizeof(hookhdr)) goto err;
while (hookhdr.tag[0]) {
/* Do a bit of sanity checking on this dump header */
hookhdr.tag[VMAD_HOOK_TAG_LEN-1] = 0; /* null terminate that string... */
if (hookhdr.size <= 0) {
r = -EINVAL;
goto err;
}
/* See if we find a matching hook */
down_read(&hook_lock);
for (l = hooks.next; l != &hooks; l = l->next) {
h = list_entry(l, struct hook_t, list);
if (strcmp(hookhdr.tag, h->hook->tag) == 0) {
r = h->hook->thaw(&hh, &hookhdr, regs);
break;
}
}
if (l == &hooks)
r = skip_data(ctx, file, hookhdr.size);
up_read(&hook_lock);
if (r) goto err;
r = read_kern(ctx, file, &hookhdr, sizeof(hookhdr));
if (r != sizeof(hookhdr)) goto err;
}
return 0;
err:
if (r >= 0) r = -EIO;
return r;
}
/* read/write calls for use by hooks */
ssize_t vmadump_read_u(struct vmadump_hook_handle *h, void *buf, size_t count){
if (h->rw != 0) return -EINVAL;
return read_user(h->ctx, h->file, buf, count);
}
ssize_t vmadump_read_k(struct vmadump_hook_handle *h, void *buf, size_t count){
ssize_t err;
mm_segment_t oldfs;
oldfs = get_fs(); set_fs(KERNEL_DS);
err = vmadump_read_u(h, buf, count);
set_fs(oldfs);
return err;
}
ssize_t vmadump_write_u(struct vmadump_hook_handle *h,
const void *buf, size_t count) {
if (h->rw != 1) return -EINVAL;
return write_user(h->ctx, h->file, buf, count);
}
ssize_t vmadump_write_k(struct vmadump_hook_handle *h,
const void *buf, size_t count) {
ssize_t err;
mm_segment_t oldfs;
oldfs = get_fs(); set_fs(KERNEL_DS);
err = vmadump_write_u(h, buf, count);
set_fs(oldfs);
return err;
}
#endif
/* directio_avail
*
* Boolean return: non-zero if directio_start will succeed
*/
static
int
directio_avail(struct file *filp)
{
int result = 0; /* assume failure */
/*
* This was basically ripped out of setfl() in 2.6.22, with some #if's
* added based on 2.6.1->2 and 2.6.7->8 changes to that function.
* And for 2.6.29->30 changes (file.f_lock)
*
* The alternative is to call sys_fcntl() directly. This is a good idea.
* But right now I'm not in the mood to walk the fd array to identify the
* proper file descriptor.
*
* XXX: Do that.
*/
/* Cannot perform alignment unless f_pos is being advanced */
if (!filp->f_pos)
goto out;
#if HAVE_FILE_F_MAPPING
/* Order matters, if kernel has both f_mapping and i_mapping use f_mapping */
if (!filp->f_mapping || !filp->f_mapping->a_ops ||
!filp->f_mapping->a_ops->direct_IO)
goto out;
#elif HAVE_INODE_I_MAPPING
struct inode *inode = filp->f_dentry->d_inode;
if (!inode->i_mapping || !inode->i_mapping->a_ops ||
!inode->i_mapping->a_ops->direct_IO)
goto out;
#else
#error
#endif
#if HAVE_FILE_OPERATIONS_CHECK_FLAGS
if (filp->f_op && filp->f_op->check_flags &&
filp->f_op->check_flags(filp->f_flags | O_DIRECT))
goto out;
#else
/* OK */
#endif
result = 1;
out:
return result;
}
/*
* directio_start
*
* The caller MUST ensure that the filp is aligned properly (usually to
* 512 bytes) before calling this routine. I've aligned everything to page
* size.
*/
static
unsigned int
directio_start(struct file *filp)
{
unsigned int saved_flags = filp->f_flags;
/*
* This was basically ripped out of setfl() in 2.6.22, with some #if's
* added based on 2.6.1->2 and 2.6.7->8 changes to that function.
* And for 2.6.29->30 changes (file.f_lock)
*
* The alternative is to call sys_fcntl() directly. This is a good idea.
* But right now I'm not in the mood to walk the fd array to identify the
* proper file descriptor.
*
* XXX: Do that.
*/
#if HAVE_FILE_F_LOCK
spin_lock(&filp->f_lock);
filp->f_flags |= O_DIRECT;
spin_unlock(&filp->f_lock);
#else
/* The lock_kernel() does appear necessary here because both
* setfl() and ioctl() use it when modifying f_flags. So, to
* prevent corruption of f_flags, we take the lock too.
* Of course if somebody is changing f_flags on the context
* fd while we are actively writing... not good.
*/
lock_kernel();
filp->f_flags |= O_DIRECT;
unlock_kernel();
#endif
return saved_flags;
}
static
void directio_stop(struct file *filp, unsigned int saved_flags)
{
#if HAVE_FILE_F_LOCK
spin_lock(&filp->f_lock);
filp->f_flags = saved_flags;
spin_unlock(&filp->f_lock);
#else
lock_kernel();
filp->f_flags = saved_flags;
unlock_kernel();
#endif
}
/* sys_prctl "by value" */
int vmadump_prctl_v(int option, unsigned long arg2) {
return sys_prctl(option, arg2, 0, 0, 0);
}
/* sys_prctl "by reference" */
int vmadump_prctl_k(int option, void *arg2) {
int err;
mm_segment_t oldfs;
oldfs = get_fs(); set_fs(KERNEL_DS);
err = sys_prctl(option, (unsigned long)arg2, 0, 0, 0);
set_fs(oldfs);
return err;
}
int vmadump_sigaltstack_k(const stack_t *ss, stack_t *oss) {
int err;
mm_segment_t oldfs;
oldfs = get_fs(); set_fs(KERNEL_DS);
err = do_sigaltstack(ss, oss, 0);
set_fs(oldfs);
return err;
}
/*--------------------------------------------------------------------
* Process "thawing" routines.
*------------------------------------------------------------------*/
long vmad_remap(cr_rstrt_proc_req_t *ctx, unsigned long from_addr,
unsigned long to_addr, unsigned long len) {
long r;
unsigned long new_addr;
unsigned long diff = (from_addr > to_addr) ? (from_addr - to_addr)
: (to_addr - from_addr);
if (diff < len) { /* Check for overlap case */
unsigned long tmp_addr;
tmp_addr = cr_mmap_pgoff(NULL, 0, len, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, 0);
r = (tmp_addr & (PAGE_SIZE-1));
if (r) {
CR_ERR_CTX(ctx, "vmad_remap failed to allocate temporary %d", (int)r);
goto err;
}
new_addr = sys_mremap(from_addr, len, len, MREMAP_FIXED|MREMAP_MAYMOVE, tmp_addr);
if (new_addr != tmp_addr) {
r = (new_addr & (PAGE_SIZE-1)) ? new_addr : -ENOMEM;
CR_ERR_CTX(ctx, "vmad_remap failed to use temporary %d", (int)r);
goto err;
}
from_addr = tmp_addr;
}
new_addr = sys_mremap(from_addr, len, len, MREMAP_FIXED|MREMAP_MAYMOVE, to_addr);
if (new_addr != to_addr) {
r = (new_addr & (PAGE_SIZE-1)) ? new_addr : -ENOMEM;
CR_ERR_CTX(ctx, "vmad_remap failed %d", (int)r);
goto err;
}
r = 0;
err:
return r;
}
static
int mmap_file(cr_rstrt_proc_req_t *ctx,
const struct vmadump_vma_header *head, char *filename,
unsigned long flags) {
struct file *file;
long mapaddr;
int open_flags;
unsigned long prot;
if (head->flags & VM_MAYSHARE) {
if (head->flags & VM_MAYWRITE) {
open_flags = (head->flags & (VM_MAYREAD|VM_MAYEXEC)) ? O_RDWR : O_WRONLY;
prot = PROT_WRITE;
} else {
open_flags = O_RDONLY;
prot = 0;
}
if (head->flags & VM_MAYREAD) prot |= PROT_READ;
if (head->flags & VM_MAYEXEC) prot |= PROT_EXEC;
} else {
open_flags = O_RDONLY;
prot = PROT_READ|PROT_WRITE|PROT_EXEC;
}
/* This is a lot like open w/o a file descriptor */
#if 0 /* Not supported in BLCR */
if (ctx && ctx->map_open)
file = ctx->map_open(ctx, filename, open_flags);
else
#endif
file = default_map_open(ctx, filename, open_flags);
if (IS_ERR(file)) {
CR_ERR_CTX(ctx, "open('%s', 0x%x) failed: %d", filename, open_flags, (int)PTR_ERR(file));
return PTR_ERR(file);
}
down_write(¤t->mm->mmap_sem);
mapaddr = cr_mmap_pgoff(file, head->start, head->end - head->start,
prot, flags, head->pgoff);
up_write(¤t->mm->mmap_sem);
fput(file);
if (mapaddr != head->start)
CR_ERR_CTX(ctx, "mmap(<file>, %p, %p, ...) failed: %p",
(void *) head->start, (void *) (head->end-head->start),
(void *) mapaddr);
return (mapaddr == head->start) ? 0 : mapaddr;
}
/* Reads in the header giving the the number of bytes of "fill" to
* achieve alignment, and returns that value in *buf_len.
* ONLY if "fill" is less than VMAD_CHUNKHEADER_MIN bytes is the
* corresponding padding read here.
*/
static long
load_page_list_header(cr_rstrt_proc_req_t * ctx, struct file *file,
void *buf, unsigned int *buf_len, int *use_directio)
{
struct vmadump_page_list_header header;
long bytes = 0;
long r;
/* load in the header so we know how many bytes of alignment there are */
r = read_kern(ctx, file, &header, sizeof(header));
if (r != sizeof(header)) goto err;
bytes += r;
/* determine if O_DIRECT should be used to read this pages */
if (header.fill == PAGE_SIZE) {
/* PAGE_SIZE means directio was NOT used at checkpoint time */
use_directio = 0;
header.fill = 0;
} else {
*use_directio = directio_avail(file);
}
/* now read in the padding if too small to fit page headers */
if (!header.fill) {
/* No padding at all */
} else if (header.fill < VMAD_CHUNKHEADER_MIN) {
/* TODO: use cr_skip(), which may someday seek */
r = read_kern(ctx, file, buf, header.fill);
if (r != header.fill) goto err;
bytes += r;
} else {
/* Padding is large enough to use for the page headers */
*buf_len = header.fill;
}
return bytes;
err:
if (r >= 0) r = -EIO; /* map short reads to EIO */
return r;
}
/*
* Returns 0 or 1 on success.
* 0 = EOF, meaning no more pages are available
* 1 = Caller must call again to load more pages
* <0 Some error
*/
long load_page_chunks(cr_rstrt_proc_req_t * ctx, struct file *file,
struct vmadump_page_header *headers, int sizeof_headers,
int is_exec, int use_directio)
{
unsigned long old_filp_flags = 0;
long r = 1;
const int max_chunks = sizeof_headers/sizeof(*headers);
int i;
/* Now load the chunk page */
r = read_kern(ctx, file, headers, sizeof_headers);
if (r != sizeof_headers) { goto bad_read; }
/* spin up direct IO */
if (use_directio)
old_filp_flags = directio_start(file);
/* load each chunk */
for (i = 0; i < max_chunks; ++i) {
const long len = (long)headers[i].num_pages << PAGE_SHIFT;
const unsigned long page_start = headers[i].start;
if (page_start == VMAD_END_OF_CHUNKS) {
/* EOF */
r = 0;
break;
}
r = read_user(ctx, file, (void *) page_start, len);
if (r != len) { goto bad_read; }
if (is_exec) { flush_icache_range(page_start, page_start + len); }
r = 1;
}
/* disable direct IO */
if (use_directio)
directio_stop(file, old_filp_flags);
return r;
bad_read:
if (r >= 0) { r = -EIO; } /* map short reads to EIO */
return r;
}
int vmadump_load_page_list(cr_rstrt_proc_req_t *ctx,
struct file *file, int is_exec)
{
struct vmadump_page_header *chunks;
long r;
unsigned int sizeof_chunks = VMAD_CHUNKHEADER_SIZE;
int use_directio = 0;
chunks = (struct vmadump_page_header *) kmalloc(sizeof_chunks, GFP_KERNEL);
if (chunks == NULL) {
r = -ENOMEM;
goto err;
}
/* handle alignment padding - either skip it or use it for first batch of chunks */
r = load_page_list_header(ctx, file, chunks, &sizeof_chunks, &use_directio);
if (r < 0) { goto out_free; }
/* now load all the page chunks */
do {
r = load_page_chunks(ctx, file, chunks, sizeof_chunks, is_exec, use_directio);
if (r < 0) { goto out_free; }
sizeof_chunks = VMAD_CHUNKHEADER_SIZE; /* After the first, all chunk arrays are this size */
} while (r > 0);
out_free:
kfree(chunks);
err:
return r;
}
static
int load_map(cr_rstrt_proc_req_t *ctx,
struct file *file, struct vmadump_vma_header *head) {
long r;
unsigned long mmap_prot, mmap_flags, addr;
if (head->namelen == VMAD_NAMELEN_ARCH) {
#if VMAD_HAVE_ARCH_MAPS
return vmad_load_arch_map(ctx, file, head);
#else
CR_ERR_CTX(ctx, "Found an arch-specific mapping in a kernel without any???");
return -EINVAL;
#endif
}
mmap_prot = 0;
mmap_flags = MAP_FIXED | ((head->flags & VM_MAYSHARE) ? MAP_SHARED : MAP_PRIVATE);
if (head->flags & VM_READ) mmap_prot |= PROT_READ;
if (head->flags & VM_WRITE) mmap_prot |= PROT_WRITE;
if (head->flags & VM_EXEC) mmap_prot |= PROT_EXEC;
if (head->flags & VM_GROWSDOWN) mmap_flags |= MAP_GROWSDOWN;
#ifdef VM_EXECUTABLE
if (head->flags & VM_EXECUTABLE) mmap_flags |= MAP_EXECUTABLE;
#endif
if (head->flags & VM_DENYWRITE) mmap_flags |= MAP_DENYWRITE;
if (head->namelen > 0) {
char *filename;
if (head->namelen > PAGE_SIZE) {
CR_ERR_CTX(ctx, "thaw: bogus namelen %d", (int) head->namelen);
return -EINVAL;
}
filename = kmalloc(head->namelen+1,GFP_KERNEL);
if (!filename) {
r = -ENOMEM;
goto err;
}
r = read_kern(ctx, file, filename, head->namelen);
if (r != head->namelen) {
kfree(filename);
goto err;
}
filename[head->namelen] = 0;
r = mmap_file(ctx, head, filename, mmap_flags);
if (r) {
CR_ERR_CTX(ctx, "mmap failed: %s", filename);
kfree(filename);
return r;
}
kfree(filename);
} else {
/* Load the data from the dump file */
down_write(¤t->mm->mmap_sem);
addr = cr_mmap_pgoff(0, head->start, head->end - head->start,
mmap_prot|PROT_WRITE, mmap_flags, 0);
up_write(¤t->mm->mmap_sem);
if (addr != head->start) {
CR_ERR_CTX(ctx, "mmap(0, %08lx, %08lx, ...) = 0x%08lx (failed)",
head->start, head->end - head->start, addr);
if ((addr != head->start) && IS_ERR((void *) addr)) {
r = PTR_ERR((void *) addr);
} else {
r = -EINVAL;
}
return r;
}
}
/* Read in patched pages */
r = vmadump_load_page_list(ctx, file, (mmap_prot & PROT_EXEC));
if (r) goto err;
if (sys_mprotect(head->start,head->end - head->start, mmap_prot))
CR_ERR_CTX(ctx, "thaw: mprotect failed. (ignoring)");
return 0;
err:
if (r >= 0) r = -EIO; /* map short reads to EIO */
return r;
}
static
int vmadump_load_sigpending(cr_rstrt_proc_req_t *ctx, struct file *file,
struct sigpending *sigpending, int shared) {
sigset_t pending_set;
int flags;
long r;
r = read_kern(ctx, file, &flags, sizeof(flags));
if (r != sizeof(flags)) goto bad_read;
while (flags != -1) {
struct siginfo info;
r = read_kern(ctx, file, &info, sizeof(info));
if (r != sizeof(info)) goto bad_read;
/* XXX: if/when we do support posix timers directly, we might
* need to deal with SIGQUEUE_PREALLOC in flags.
* For now there is no harm in ignoring it.
*/
if (shared) {
read_lock(&tasklist_lock);
r = group_send_sig_info(info.si_signo, &info, current);
read_unlock(&tasklist_lock);
} else {
r = send_sig_info(info.si_signo, &info, current);
}
r = read_kern(ctx, file, &flags, sizeof(flags));
if (r != sizeof(flags)) goto bad_read;
}
/* Corresponding signal set comes last */
r = read_kern(ctx, file, &pending_set, sizeof(pending_set));
if (r != sizeof(pending_set)) goto bad_read;
spin_lock_irq(¤t->sighand->siglock);
sigorsets(&sigpending->signal, &sigpending->signal, &pending_set);
recalc_sigpending();
spin_unlock_irq(¤t->sighand->siglock);
return 0;
bad_read:
if (r >= 0) r = -EIO; /* Map short writes to EIO */
return r;
}
/* Values of (struct vmad_prctl).type */
enum vmad_prctl_type {
vmad_prctl_int_ref, /* integer read by reference, written by value*/
vmad_prctl_int_val, /* integer read and written by value */
vmad_prctl_bool, /* integer read and written by value, write must be 0 or 1 */
vmad_prctl_comm, /* string of length TASK_COMM_LEN, set by reference */
};
struct vmad_prctl {
int option; /* First argument to prctl() to set */
int type; /* How to handle 2nd argument */
};
static
int vmadump_load_prctl(cr_rstrt_proc_req_t *ctx, struct file *file) {
struct vmad_prctl header;
long r;
r = read_kern(ctx, file, &header, sizeof(header));
if (r != sizeof(header)) goto bad_read;
while (header.option) { /* option==0 is end of the list */
switch (header.type) {
case vmad_prctl_bool:
case vmad_prctl_int_val:
case vmad_prctl_int_ref: {
unsigned int value;
r = read_kern(ctx, file, &value, sizeof(value));
if (r != sizeof(value)) goto bad_read;
r = vmadump_prctl_v(header.option, value);
break;
}
case vmad_prctl_comm: {
#if defined(PR_SET_NAME)
char value[TASK_COMM_LEN];
r = read_kern(ctx, file, &value, sizeof(value));
if (r != sizeof(value)) goto bad_read;
r = vmadump_prctl_k(header.option, &value);
#else
if (sizeof(current->comm) != TASK_COMM_LEN) {
CR_ERR_CTX(ctx, "vmadump: TASK_COMM_LEN changed?");
r = -EINVAL;
goto bad_read;
}
r = read_kern(ctx, file, current->comm, TASK_COMM_LEN);
if (r != TASK_COMM_LEN) goto bad_read;
#endif
break;
}
default:
CR_ERR_CTX(ctx, "vmadump: prtcl %d has unknown type code %d",
header.option, header.type);
goto bad_read;
}
#if 0 /* Confusing when issued, for instance, for PR_SET_SECCOMP where permission is denied */
if (r < 0) {
CR_WARN_CTX(ctx, "vmadump warning: failed to set prtcl(%d) err %ld", header.option, r);
}
#endif
r = read_kern(ctx, file, &header, sizeof(header));
if (r != sizeof(header)) goto bad_read;
}
bad_read:
if (r >= 0) r = -EIO; /* Map short writes to EIO */
return r;
}
long vmadump_thaw_proc(cr_rstrt_proc_req_t *ctx,
struct file *file, struct pt_regs *regs,
int flags) {
long r;
pid_t pid;
#if BITS_PER_LONG == 64
unsigned long orig_personality = personality(current->personality);
#endif
{
struct vmadump_header header;
/*--- First some sanity checking ---*/
r = read_kern(ctx, file, &header, sizeof(header));
if (r != sizeof(header)) {
CR_ERR_CTX(ctx, "vmadump: failed to read header: %ld", r);
return -EINVAL;
}
if (memcmp(header.magic, vmad_magic, sizeof(header.magic))) {
CR_ERR_CTX(ctx, "vmadump: invalid signature");
return -EINVAL;
}
if (header.fmt_vers != VMAD_FMT_VERS) {
CR_ERR_CTX(ctx, "vmadump: dump version mistmatch. dump=%d; "
"kernel=%d", (int)header.fmt_vers, (int)VMAD_FMT_VERS);
return -EINVAL;
}
if (header.arch != VMAD_ARCH) {
CR_ERR_CTX(ctx, "vmadump: architecture mismatch.");
return -EINVAL;
}
if (header.major != ((LINUX_VERSION_CODE >> 16) & 0xFF) ||
header.minor != ((LINUX_VERSION_CODE >> 8) & 0xFF)
#if defined(STRICT_VERSION_CHECK) && STRICT_VERSION_CHECK
||header.patch != (LINUX_VERSION_CODE & 0xFF)
#endif
) {
CR_ERR_CTX(ctx, "vmadump: kernel version mismatch.");
return -EINVAL;
}
}
/* Ummm... Point of no-return is here.... maybe try to move this
* down a bit? */
#if 0 /* Now handled w/ other prctl values */
if (!(flags & VMAD_DUMP_REGSONLY)) {
/* Read our new comm */
r = read_kern(ctx, file, current->comm, sizeof(current->comm));
if (r != sizeof(current->comm)) goto bad_read;
}
#endif
vmadump_load_prctl(ctx, file);
/* PID, provided only for the benefit of our caller */
{
r = read_kern(ctx, file, &pid, sizeof(pid));
if (r != sizeof(pid)) goto bad_read;
}
/* Credentials, important to do before we try to open any files */
{
r = cr_load_creds(ctx);
if (r < 0) goto bad_read;
}
/*
* CPU-specific register restore stuff
*
* Note that we're not presuming that our current regs pointer
* points to anything even vaguely reasonable. This is done to
* support bproc type kernel threads that have never been user
* processes before.
*/
r = vmadump_restore_cpu(ctx, file, regs);
if (r) goto bad_read;
/*--- Signal information ---------------------------------------*/
{
int i;
stack_t sig_stack;
sigset_t sig_blocked;
struct k_sigaction sig_action;
/* Restore sigaltstack */
r = read_kern(ctx, file, &sig_stack, sizeof(sig_stack));
if (r != sizeof(sig_stack)) goto bad_read;
r = vmadump_sigaltstack_k(&sig_stack, NULL);
if (r < 0) goto bad_read;
/* Install sets of blocked and pending signals */
r = read_kern(ctx, file, &sig_blocked, sizeof(sig_blocked));
if (r != sizeof(sig_blocked)) goto bad_read;
sigdelsetmask(&sig_blocked, sigmask(SIGKILL)|sigmask(SIGSTOP));
spin_lock_irq(¤t->sighand->siglock);
memcpy(¤t->blocked, &sig_blocked, sizeof(sig_blocked));
recalc_sigpending();
spin_unlock_irq(¤t->sighand->siglock);
r = vmadump_load_sigpending(ctx, file, ¤t->pending, 0);
if (r < 0) goto bad_read;
if (!(flags & VMAD_DUMP_REGSONLY)) {
/* Restore shared queue if not actually shared, or if we are the "leader" */
r = vmadump_load_sigpending(ctx, file, ¤t->signal->shared_pending, 1);
if (r < 0) goto bad_read;
}
if (!(flags & VMAD_DUMP_REGSONLY)) {
for (i=0; i < _NSIG; i++) {
r = read_kern(ctx, file, &sig_action, sizeof(sig_action));
if (r != sizeof(sig_action)) goto bad_read;
if (i != SIGKILL-1 && i != SIGSTOP-1) {
r = do_sigaction(i+1, &sig_action, 0);
if (r) goto bad_read;
}
}
}
}
/*--- Misc other stuff -----------------------------------------*/
{ /* our tid ptr */
r = read_kern(ctx, file, ¤t->clear_child_tid,
sizeof(current->clear_child_tid));
if (r != sizeof(current->clear_child_tid)) { goto bad_read; }
}
{ /* personality */
unsigned long tmp_personality;
r = read_kern(ctx, file, &tmp_personality, sizeof(tmp_personality));
if (r != sizeof(tmp_personality)) { goto bad_read; }
set_personality(tmp_personality);
}
/*--- Memory map meta data -------------------------------------*/
if (!(flags & VMAD_DUMP_REGSONLY)) {
struct mm_struct *mm;
struct vm_area_struct *map;
struct vmadump_mm_info mm_info;
struct vmadump_vma_header mapheader;
#if HAVE_MM_MMAP_BASE
unsigned long mmap_base;
#endif
int map_count;
#if BITS_PER_LONG == 64
/* If restarting a 32-bit application from a 64-bit cr_restart, we need
* to reset TIF_32BIT when unmapping the pages, otherwise do_munmap
* enters an infinite loop!
*/
#if defined(TIF_ADDR32)
/* Nothing to do here */
#elif defined(TIF_32BIT)
#define TIF_ADDR32 TIF_32BIT
#elif defined(TIF_IA32)
#define TIF_ADDR32 TIF_IA32
#endif
int fiddle_tif_addr32 = test_thread_flag(TIF_ADDR32) && (orig_personality != PER_LINUX32);
#endif
mm = current->mm;
r = read_kern(ctx, file, &mm_info, sizeof(mm_info));
if (r != sizeof(mm_info)) { goto bad_read; }
#if HAVE_MM_MMAP_BASE
r = read_kern(ctx, file, &mmap_base, sizeof(mmap_base));
if (r != sizeof(mmap_base)) { goto bad_read; }
#endif
#if BITS_PER_LONG == 64
if (fiddle_tif_addr32) {
clear_thread_flag(TIF_ADDR32);
}
#endif
/* Purge current maps - I'm sure there's a way to keep theses around
* incase creation of the new ones fails in some unfortunate way... */
while(mm->mmap) {
map = mm->mmap;
map_count = mm->map_count;
if (map->vm_start >= TASK_SIZE) {
/* a special high mapping - leave it in place */
BUG_ON(map->vm_next);
break;
}
r = do_munmap(mm, map->vm_start, map->vm_end - map->vm_start);
if (r) {
CR_ERR_CTX(ctx, "do_munmap(%lx, %lx) = %d",
map->vm_start, map->vm_end-map->vm_start, (int)r);
}
if (map_count == mm->map_count) {
CR_ERR_CTX(ctx, "do_munmap() loop stuck.");
r = -EINVAL;
goto bad_read;
}
}
#if BITS_PER_LONG == 64
if (fiddle_tif_addr32) {
set_thread_flag(TIF_ADDR32);
}
#endif
/* (re)set mm paramaters which influence get_unmapped_area() */
down_write(¤t->mm->mmap_sem);
#if HAVE_MM_TASK_SIZE
mm->task_size = TASK_SIZE;
#endif
#if defined(CR_KCODE_arch_pick_mmap_layout)
arch_pick_mmap_layout(mm);
#endif
#if HAVE_MM_MMAP_BASE
/* want to restore these even if arch_pick_mmap_layout() set them */
mm->mmap_base = mmap_base;
mm->free_area_cache = mmap_base;
#else
mm->free_area_cache = TASK_UNMAPPED_BASE;
#endif
#if HAVE_MM_CACHED_HOLE_SIZE
mm->cached_hole_size = ~0UL;
#endif
up_write(¤t->mm->mmap_sem);
/* Load new map data */
r = read_kern(ctx, file, &mapheader, sizeof(mapheader));
while (r == sizeof(mapheader) &&
(mapheader.start != ~0 || mapheader.end != ~0)) {
if ((r = load_map(ctx, file, &mapheader))) goto bad_read;
r = read_kern(ctx, file, &mapheader, sizeof(mapheader));
}
if (r != sizeof(mapheader)) goto bad_read;
down_write(¤t->mm->mmap_sem);
mm->start_code = mm_info.start_code;
mm->end_code = mm_info.end_code;
mm->start_data = mm_info.start_data;
mm->end_data = mm_info.end_data;
mm->start_brk = mm_info.start_brk;
mm->brk = mm_info.brk;
mm->start_stack= mm_info.start_stack;
/* FIX ME: validate these pointers */
mm->arg_start = mm_info.arg_start;
mm->arg_end = mm_info.arg_end;
mm->env_start = mm_info.env_start;
mm->env_end = mm_info.env_end;
up_write(¤t->mm->mmap_sem);
}
#if 0 /* Hooks code not needed/maintained for BLCR */
/*--- Call external thaw hooks ---------------------------------*/
r = do_thaw_hooks(ctx, file, regs);
if (r) goto bad_read;
#endif
return pid;
bad_read:
if (r >= 0) r = -EIO;
return r;
}
/*--------------------------------------------------------------------
* Process "freezing" routines
*------------------------------------------------------------------*/
/* This routine walks the page tables.
* If addr is a huge page, returns NULL and sets *pagep non-null
* If addr is not in the page tables, returns NULL and sets *pagep=NULL
* Otherwise returns non-NULL (w/ *pagep undefined) and caller must pte_unmap().
*/
static inline
pte_t *vmad_follow_addr(struct page **pagep, struct mm_struct *mm, unsigned long addr) {
pgd_t *pgd;
#ifdef PTRS_PER_PUD
pud_t *pud;
#endif
pmd_t *pmd;
#if !defined(CONFIG_HUGETLBFS)
/* Nothing to do here */
#elif HAVE_4_ARG_FOLLOW_HUGE_ADDR
struct vm_area_struct *vma = hugepage_vma(mm, addr);
if (vma) {
*pagep = follow_huge_addr(mm, vma, addr, 0);
return NULL;
}
#elif HAVE_3_ARG_FOLLOW_HUGE_ADDR
struct page *pg = follow_huge_addr(mm, addr, 0);
if (!IS_ERR(pg)) {
*pagep = pg;
return NULL;
}
#else
#error "No way to call follow_huge_addr()"
#endif
*pagep = NULL;
pgd = pgd_offset(mm, addr);
if (pgd_none(*pgd)) return NULL;
#ifdef PTRS_PER_PUD
pud = pud_offset(pgd, addr);
if (pud_none(*pud)) return NULL;
pmd = pmd_offset(pud, addr);
#else
pmd = pmd_offset(pgd, addr);
#endif
if (pmd_none(*pmd)) return NULL;
#ifdef CONFIG_HUGETLBFS
if (pmd_huge(*pmd)) {
*pagep = follow_huge_pmd(mm, addr, pmd, 0);
return NULL;
}
#endif
return pte_offset_map(pmd, addr);
}
/* This routine checks if a page from a filemap has been copied via
* copy on write. Basically, this is just checking to see if the page
* is still a member of the map or not. Note this this should not end
* up copying random things from VM_IO regions. */
static
int addr_copied(struct mm_struct *mm, unsigned long addr) {
pte_t *ptep;
struct page *pg;
int ret;
#if !HAVE_PAGEANON
#define PageAnon(pg) (!(pg)->mapping)
#endif
spin_lock(&mm->page_table_lock);
ptep = vmad_follow_addr(&pg, mm, addr);
if (ptep) {
pte_t pte = *ptep;
pte_unmap(ptep);
if (pte_present(pte)) {
pg = pte_page(pte);
ret = PageAnon(pg);
} else {
/* pte_none is false for a swapped (written) page */
ret = !pte_none(pte);
}
} else {
ret = pg && PageAnon(pg);
}
spin_unlock(&mm->page_table_lock);
return ret;
}
/* This is the version for working on a region that is a file map. In
* this case we need to fault the page in to check for zero. This
* isn't a big deal since we'll be faulting in for sending anyway if
* it's not. */
static
int addr_nonzero_file(struct mm_struct *mm, unsigned long addr) {
int i;
unsigned long val = 0;
/* Simple zero check */
for (i=0; i < (PAGE_SIZE/sizeof(long)); i++) {
/* We ignore EFAULT and presume that it's zero here */
get_user(val, (((long*)addr)+i));
if (val) return 1;
}
return 0;
}
/* This version is for use on regions which are *NOT* file maps. Here
* we look at the page tables to see if a page is zero. If it's never
* been faulted in, we know it's zero - and we don't fault it in while
* checking for this. */
static
int addr_nonzero(struct mm_struct *mm, unsigned long addr) {
int i;
struct page *pg;
pte_t *ptep;
unsigned long val;
spin_lock(&mm->page_table_lock);
ptep = vmad_follow_addr(&pg, mm, addr);
if (ptep) {
pte_t pte = *ptep;
pte_unmap(ptep);
if (pte_none(pte)) goto out_zero; /* Never faulted */
if (pte_present(pte) && (pte_page(pte) == ZERO_PAGE(addr))) goto out_zero; /* Only READ faulted */
} else if (!pg) {
goto out_zero;
}
spin_unlock(&mm->page_table_lock);
/* Ok, the page could be non-zero - check it... */
for (i=0; i < (PAGE_SIZE/sizeof(long)); i++) {
get_user(val, (((long*)addr)+i));
if (val) return 1;
}
return 0;
out_zero:
spin_unlock(&mm->page_table_lock);
return 0;
}
/* Writes out the header giving the reader the number of bytes of
* "fill", and returns that value in *buf_len.
* ONLY if "fill" is smaller than VMAD_CHUNKHEADER_MIN bytes is
* the corresponding padding written here.
* A "fill" of PAGE_SIZE means we are NOT going to use O_DIRECT
*/
static long
store_page_list_header(cr_chkpt_proc_req_t *ctx, struct file *file,
void *buf, unsigned int *buf_len, int *use_directio)
{
struct vmadump_page_list_header header;
long bytes = 0;
long r;
unsigned int fill;
const int have_directio = directio_avail(file);
fill = have_directio
? PAGE_SIZE - ((file->f_pos + sizeof(header)) & (PAGE_SIZE - 1))
: PAGE_SIZE;
header.fill = fill;
r = write_kern(ctx, file, &header, sizeof(header));
if (r != sizeof(header))
goto bad_write;
bytes += r;
if (!fill || (fill == PAGE_SIZE)) {
/* no padding at all */
} else if (fill < VMAD_CHUNKHEADER_MIN) {
/* TODO: seek when possible? */
r = write_kern(ctx, file, buf, fill);
if (r != fill)
goto bad_write;
bytes += r;
} else {
/* Padding is large enough to use for the page headers */
*buf_len = fill;
}
*use_directio = have_directio;
return bytes;
bad_write:
if (r >= 0)
r = -EIO; /* Map short writes to EIO */
return r;
}
/*
* Returns < 0 on failure, or written byte count on success.
*/
static
long store_page_chunks(cr_chkpt_proc_req_t *ctx, struct file *file,
struct vmadump_page_header *headers,
int sizeof_headers, int use_directio)
{
unsigned long old_filp_flags = 0;
unsigned long chunk_start;
long r, bytes = 0;
int i;
const int num_headers = sizeof_headers/sizeof(*headers);
r = write_kern(ctx, file, headers, sizeof_headers);
if (r != sizeof_headers) goto bad_write;
bytes += r;
/* Avoid directio_start/stop if there is no page I/O */
if (headers[0].start == VMAD_END_OF_CHUNKS) goto empty;
/*
* attempt to set up direct IO for the chunk writes.
*/
if (use_directio)
old_filp_flags = directio_start(file);
for (i=0; i<num_headers; ++i) {
const long len = (long)headers[i].num_pages << PAGE_SHIFT;
chunk_start = headers[i].start;
if (chunk_start == VMAD_END_OF_CHUNKS) {
/* EOF */
break;
}
r = write_user(ctx, file, (void *)chunk_start, len);
if (r != len) goto bad_write;
bytes += r;
}
if (use_directio)
directio_stop(file, old_filp_flags);
empty:
return bytes;
bad_write:
if (r >= 0) r = -EIO; /* Map short writes to EIO */
return r;
}
/* Add an element to the chunks array, and if its full or "finished" then
* write the chunks array. Elements with zero pages are omitted.
* "Finished" is defined as having start == VMAD_END_OF_CHUNKS in this chunk.
*
* Returns the number of bytes written (could be zero), or <0 on error.
* If data was written, then sizeof_chunks and chunk_number are reset.
*
* chunks - the chunks array to write
* *sizeof_chunks - length of chunks in BYTES
* *chunk_number - next unoccupied entry in array
*/
static inline loff_t
write_chunk(cr_chkpt_proc_req_t *ctx, struct file *file,
struct vmadump_page_header *chunks, unsigned int *sizeof_chunks,
int *chunk_number, unsigned long start, unsigned long num_pages,
int use_directio)
{
long r = 0;
/* Add an element to the array unless is would be empty*/
if (num_pages || (start == VMAD_END_OF_CHUNKS)) {
const int max_chunks = *sizeof_chunks/sizeof(*chunks);
int index;
index = (*chunk_number)++;
chunks[index].start = start;
chunks[index].num_pages = num_pages;
/* Write the array if full or finished */
if (((index + 1) >= max_chunks) || (start == VMAD_END_OF_CHUNKS)) {
r = store_page_chunks(ctx, file, chunks, *sizeof_chunks, use_directio);
*sizeof_chunks = VMAD_CHUNKHEADER_SIZE;
*chunk_number = 0;
}
}
return r;
}
/*
* SOMEDAY: we may want a field in vmadump_page_header for page hashes
*
* SOMEDAY: add a buffer argument through some of these routines
* so that we can put compression in there.
*/
static loff_t
store_page_list(cr_chkpt_proc_req_t * ctx, struct file *file,
unsigned long start, unsigned long end,
int (*need_to_save) (struct mm_struct * mm, unsigned long))
{
long r;
loff_t bytes = 0;
unsigned long addr;
unsigned long chunk_start, chunk_end, num_contig_pages;
struct vmadump_page_header *chunks;
int chunk_number;
unsigned int sizeof_chunks = VMAD_CHUNKHEADER_SIZE;
int use_directio = 0;
/* A page 'chunk' is a contiguous range of pages in virtual memory.
*
* We identify the chunks, and store them in the chunks array.
* Our calls to write_chunk() will write all of the chunks out when needed,
* and will start filling the chunks array back from the beginning.
*/
chunks =
(struct vmadump_page_header *) cr_kzalloc(sizeof_chunks, GFP_KERNEL);
if (chunks == NULL) {
r = -ENOMEM;
}
/*
* TODO: Move this alignment step outward, perhaps as far as freeze_proc?
*/
/* Handle alignment of the current file pointer to a page boundary for direct IO.
* The "fill" required to acheive alignment is used for the first array of chunks
* if large enough. Otherwise it is written as zeros for padding.
*/
r = store_page_list_header(ctx, file, chunks, &sizeof_chunks, &use_directio);
if (r < 0) {
goto out_kfree;
}
bytes += r;
/*
* Ok, this loop does all the work. We're going to make a pass through.
*/
chunk_start = chunk_end = start;
num_contig_pages = 0;
chunk_number = 0;
for (addr = start; addr < end; addr += PAGE_SIZE) {
/* The topmost if clause (need_to_save) is to identify things like
* unmodified pages that can be reread from disk, or pages that were
* allocated and never touched (zero pages). */
if (need_to_save(current->mm, addr)) {
/* test for contiguous pages. (chunk_end == addr)
*
* break up a contiguous page range if too large, (num < ...)
*/
if (chunk_end == addr) {
num_contig_pages++;
} else {
r = write_chunk(ctx, file, chunks,
&sizeof_chunks, &chunk_number,
chunk_start, num_contig_pages,
use_directio);
if (r < 0) goto out_io;
bytes += r;
/* Start a new chunk */
chunk_start = addr;
num_contig_pages = 1;
}
/* this is part of the current chunk */
chunk_end = addr + PAGE_SIZE;
}
}
/* store the last chunk */
r = write_chunk(ctx, file, chunks,
&sizeof_chunks, &chunk_number,
chunk_start, num_contig_pages,
use_directio);
if (r < 0) goto out_io;
bytes += r;
/* now store a record marking the end of the chunks,
* which should force writting of the chunks array */
r = write_chunk(ctx, file, chunks,
&sizeof_chunks, &chunk_number,
VMAD_END_OF_CHUNKS, 0, use_directio);
if (r < 0) goto out_io;
if (r == 0) {
/* This absolutely should not happen. At the very least an EOF
* record should have been written. */
printk("write_chunks unexpectedly returned 0!\n");
}
bytes += r;
out_io:
out_kfree:
kfree(chunks);
if (r < 0) {
return r;
} else {
return bytes;
}
}
loff_t vmadump_store_page_list(cr_chkpt_proc_req_t *ctx, struct file *file,
unsigned long start, unsigned long end) {
return store_page_list(ctx, file, start, end, addr_nonzero_file);
}
loff_t vmadump_store_dirty_page_list(cr_chkpt_proc_req_t *ctx, struct file *file,
unsigned long start, unsigned long end) {
return store_page_list(ctx, file, start, end, addr_copied);
}
static
loff_t store_map(cr_chkpt_proc_req_t *ctx, struct file *file,
struct vm_area_struct *map, int flags) {
loff_t bytes;
struct vmadump_vma_header head;
char *filename=0;
char *buffer = 0;
loff_t r;
unsigned long start, end;
int isfilemap = 0;
#if VMAD_HAVE_ARCH_MAPS
r = vmad_store_arch_map(ctx, file, map, flags);
if (r) return r;
#endif
/* Never store a VM_IO region */
if (map->vm_flags & VM_IO) { return 0; }
head.start = map->vm_start;
head.end = map->vm_end;
head.flags = map->vm_flags;
head.namelen = 0;
head.pgoff = map->vm_pgoff;
/* Decide Whether or not we're gonna store the map's contents or
* a reference to the file they came from */
if (map->vm_file) {
buffer = (char *) __get_free_page(GFP_KERNEL);
if (!buffer) { return -ENOMEM; }
#if 0 /* Not supported in BLCR */
if (ctx && ctx->map_name)
filename = ctx->map_name(ctx, map->vm_file, buffer, PAGE_SIZE);
else
#endif
filename = default_map_name(map->vm_file, buffer, PAGE_SIZE);
head.namelen = strlen(filename);
if (vmad_is_special_mmap(map, flags)) {
/* Let BLCR deal with it */
free_page((long)buffer);
return 0;
} else if (vmad_dentry_unlinked(map->vm_file->f_dentry)) {
/* Region is an unlinked file - store contents, not filename */
head.namelen = 0;
} else if (vmad_is_exe(map)) {
/* Region is an executable */
if (flags & VMAD_DUMP_EXEC)
head.namelen = 0;
} else if (is_library(filename)) {
/* Region is a library */
if (flags & VMAD_DUMP_LIBS)
head.namelen = 0;
} else {
/* Region is something else */
if (flags & VMAD_DUMP_OTHER)
head.namelen=0;
}
isfilemap = 1;
}
start = map->vm_start;
end = map->vm_end;
/* Release the mm_sem here to avoid deadlocks with page faults and
* write locks that may happen during the writes. (We can't use
* the "map" pointer beyond this point. */
up_read(¤t->mm->mmap_sem);
/* Spit out the section header */
r = write_kern(ctx, file, &head, sizeof(head));
if (r != sizeof(head)) goto err;
bytes = r;
if (head.namelen > 0) {
/* Store the filename */
r = write_kern(ctx, file, filename, head.namelen);
if (r != head.namelen) goto err;
bytes += r;
r = store_page_list(ctx, file, start, end, addr_copied);
if (r < 0) goto err;
bytes += r;
} else {
/* Store the contents of the VMA as defined by start, end */
r = store_page_list(ctx, file, start, end,
isfilemap ? addr_nonzero_file : addr_nonzero);
if (r < 0) goto err;
bytes += r;
}
if (buffer) free_page((long)buffer);
down_read(¤t->mm->mmap_sem);
return bytes;
err:
if (r >= 0) r = -EIO; /* Map short writes to EIO */
if (buffer) free_page((long)buffer);
down_read(¤t->mm->mmap_sem);
return r;
}
static
long vmadump_store_sigpending(cr_chkpt_proc_req_t *ctx, struct file *file,
struct sigpending *sigpending) {
sigset_t pending_set;
long bytes = 0, r;
struct list_head *elem;
int flags;
/* We know the list can't shrink (as all threads are stopped),
* So, we are playing a bit loose w/ the locking.
*/
spin_lock_irq(¤t->sighand->siglock);
list_for_each(elem, &sigpending->list) {
struct sigqueue *q = list_entry(elem, struct sigqueue, list);
struct siginfo tmp_info, info;
mm_segment_t oldfs;
flags = q->flags;
tmp_info = q->info;
spin_unlock_irq(¤t->sighand->siglock);
/* copy_siginfo_to_user() copies only non-padding fields */
memset(&info, 0, sizeof(info));
oldfs = get_fs(); set_fs(KERNEL_DS);
r = copy_siginfo_to_user(&info, &tmp_info);
set_fs(oldfs);
if (r) goto err;
r = write_kern(ctx, file, &flags, sizeof(flags));
if (r != sizeof(flags)) goto err;
bytes += r;
r = write_kern(ctx, file, &info, sizeof(info));
if (r != sizeof(info)) goto err;
bytes += r;
spin_lock_irq(¤t->sighand->siglock);
}
memcpy(&pending_set, &sigpending->signal, sizeof(pending_set));
spin_unlock_irq(¤t->sighand->siglock);
/* Flags == -1 marks end of the list */
flags = -1;
r = write_kern(ctx, file, &flags, sizeof(flags));
if (r != sizeof(flags)) goto err;
bytes += r;
/* Corresponding signal set comes last */
r = write_kern(ctx, file, &pending_set, sizeof(pending_set));
if (r != sizeof(pending_set)) goto err;
bytes += r;
return bytes;
err:
if (r >= 0) r = -EIO; /* Map short writes to EIO */
return r;
}
static
long vmadump_store_prctl_aux(cr_chkpt_proc_req_t *ctx, struct file *file,
int option, int type, void *addr, int len) {
struct vmad_prctl header;
long r;
long bytes = 0;
header.option = option;
header.type = type;
r = write_kern(ctx, file, &header, sizeof(header));
if (r != sizeof(header)) goto err;
bytes += r;
if (len) {
r = write_kern(ctx, file, addr, len);
if (r != len) goto err;
bytes += r;
}
return bytes;
err:
if (r >= 0) r = -EIO; /* Map short writes to EIO */
return r;
}
static
int vmadump_store_prctl(cr_chkpt_proc_req_t *ctx, struct file *file) {
long r;
long bytes = 0;
int i;
const static struct {
int type;
int get_option;
int set_option;
} vmad_prctl_tbl[] = {
#if defined(PR_GET_PDEATHSIG)
{vmad_prctl_int_ref, PR_GET_PDEATHSIG, PR_SET_PDEATHSIG},
#endif
#if defined(PR_GET_DUMPABLE)
{vmad_prctl_bool, PR_GET_DUMPABLE, PR_SET_DUMPABLE},
#endif
#if defined(PR_GET_UNALIGN) && defined(GET_UNALIGN_CTL)
{vmad_prctl_int_ref, PR_GET_UNALIGN, PR_SET_UNALIGN},
#endif
#if defined(PR_GET_KEEPCAPS)
{vmad_prctl_bool, PR_GET_KEEPCAPS, PR_SET_KEEPCAPS},
#endif
#if defined(PR_GET_FPEMU) && defined(GET_FPEMU_CTL)
{vmad_prctl_int_ref, PR_GET_FPEMU, PR_SET_FPEMU},
#endif
#if defined(PR_GET_FPEXC) && defined(GET_FPEXC_CTL)
{vmad_prctl_int_ref, PR_GET_FPEXC, PR_SET_FPEXC},
#endif
#if defined(PR_GET_TIMING)
{vmad_prctl_int_val, PR_GET_TIMING, PR_SET_TIMING},
#endif
#if defined(PR_GET_ENDIAN) && defined(GET_ENDIAN)
{vmad_prctl_int_ref, PR_GET_ENDIAN, PR_SET_ENDIAN},
#endif
#if defined(PR_GET_SECCOMP)
{vmad_prctl_int_val, PR_GET_SECCOMP, PR_SET_SECCOMP},
#endif
#if defined(PR_GET_TSC) && defined(GET_TSC_CTL)
{vmad_prctl_int_ref, PR_GET_TSC, PR_SET_TSC},
#endif
#if defined(PR_GET_TIMERSLACK)
{vmad_prctl_int_val, PR_GET_TIMERSLACK, PR_SET_TIMERSLACK},
#endif
};
/* First the comm, which was not handled via prctl prior to 2.6.9 */
#if defined(PR_GET_NAME)
{
char value[TASK_COMM_LEN];
r = vmadump_prctl_k(PR_GET_NAME, &value);
if (r < 0) goto err;
r = vmadump_store_prctl_aux(ctx, file,
PR_SET_NAME, vmad_prctl_comm,
&value, sizeof(value));
if (r < 0) goto err;
bytes += r;
}
#else
/* Value of header.option is ignored, but use PR_SET_NAME to lessen confusion */
if (sizeof(current->comm) != TASK_COMM_LEN) {
CR_ERR_CTX(ctx, "vmadump: TASK_COMM_LEN changed?");
r = -EINVAL;
goto err;
}
r = vmadump_store_prctl_aux(ctx, file,
15 /* PR_SET_NAME */, vmad_prctl_comm,
¤t->comm, TASK_COMM_LEN);
if (r < 0) goto err;
bytes += r;
#endif
/* Now all the rest */
for (i = 0; i < sizeof(vmad_prctl_tbl)/sizeof(vmad_prctl_tbl[0]); ++i) {
unsigned int value;
const int type = vmad_prctl_tbl[i].type;
const int get = vmad_prctl_tbl[i].get_option;
const int set = vmad_prctl_tbl[i].set_option;
switch (type) {
case vmad_prctl_bool:
r = vmadump_prctl_v(get, 0);
if (!IS_ERR((void *)r)) { /* ICK */
value = r ? 1 : 0;
r = 0;
}
break;
case vmad_prctl_int_val:
r = vmadump_prctl_v(get, 0);
if (!IS_ERR((void *)r)) { /* ICK */
value = (unsigned int)r;
r = 0;
}
break;
case vmad_prctl_int_ref:
r = vmadump_prctl_k(get, &value);
break;
}
if (r < 0) {
#if 0 /* Confusing when issued, for instance, for PR_GET_ENDIAN where CPU lacks support */
CR_WARN_CTX(ctx, "vmadump warning: failed to read prtcl(%d) err %ld", get, r);
#endif
continue;
}
r = vmadump_store_prctl_aux(ctx, file, set, type, &value, sizeof(value));
if (r < 0) goto err;
bytes += r;
}
/* Write the list terminator */
r = vmadump_store_prctl_aux(ctx, file, 0, 0, NULL, 0);
if (r < 0) goto err;
bytes += r;
return bytes;
err:
if (r >= 0) r = -EIO; /* Map short writes to EIO */
return r;
}
loff_t vmadump_freeze_proc(cr_chkpt_proc_req_t *ctx, struct file *file,
struct pt_regs *regs, int flags) {
loff_t r, bytes=0;
static struct vmadump_header header ={VMAD_MAGIC, VMAD_FMT_VERS, VMAD_ARCH,
(LINUX_VERSION_CODE >> 16) & 0xFF,
(LINUX_VERSION_CODE >> 8) & 0xFF,
LINUX_VERSION_CODE & 0xFF };
/*--- Write out the file header ---*/
r = write_kern(ctx, file, &header, sizeof(header));
if (r != sizeof(header)) goto err;
bytes += r;
#if 0 /* Now handled w/ other prctl values */
if (!(flags & VMAD_DUMP_REGSONLY)) {
r = write_kern(ctx, file, current->comm, sizeof(current->comm));
if (r != sizeof(current->comm)) goto err;
bytes += r;
}
#endif
vmadump_store_prctl(ctx, file);
/*--- PID ---*/
r = write_kern(ctx, file, ¤t->pid, sizeof(current->pid));
if (r != sizeof(current->pid)) goto err;
bytes += r;
/*--- Credentials (uids, gids and supplemental ids) ---*/
r = cr_save_creds(ctx);
if (r < 0) goto err;
bytes += r;
/*--- CPU State Information ------------------------------------*/
r = vmadump_store_cpu(ctx, file, regs);
if (r < 0) goto err;
bytes += r;
/*--- Signal information ---------------------------------------*/
{
int i;
stack_t sig_stack;
sigset_t sig_blocked;
struct k_sigaction sig_action;
r = vmadump_sigaltstack_k(NULL, &sig_stack);
if (r < 0) goto err;
r = write_kern(ctx, file, &sig_stack, sizeof(sig_stack));
if (r != sizeof(sig_stack)) goto err;
bytes += r;
spin_lock_irq(¤t->sighand->siglock);
memcpy(&sig_blocked, ¤t->blocked, sizeof(sig_blocked));
spin_unlock_irq(¤t->sighand->siglock);
r = write_kern(ctx, file, &sig_blocked, sizeof(sig_blocked));
if (r != sizeof(sig_blocked)) goto err;
bytes += r;
r = vmadump_store_sigpending(ctx, file, ¤t->pending);
if (r < 0) goto err;
bytes += r;
if (!(flags & VMAD_DUMP_REGSONLY)) {
/* Dump shared queue if not actually shared, or if we are the "leader" */
r = vmadump_store_sigpending(ctx, file, ¤t->signal->shared_pending);
if (r < 0) goto err;
bytes += r;
}
if (!(flags & VMAD_DUMP_REGSONLY)) {
for (i=0; i < _NSIG; i++) {
spin_lock_irq(¤t->sighand->siglock);
memcpy(&sig_action, ¤t->sighand->action[i], sizeof(sig_action));
spin_unlock_irq(¤t->sighand->siglock);
r = write_kern(ctx, file, &sig_action, sizeof(sig_action));
if (r != sizeof(sig_action)) goto err;
bytes += r;
}
}
}
/*--- Misc other stuff -----------------------------------------*/
r = write_kern(ctx, file, ¤t->clear_child_tid,
sizeof(current->clear_child_tid));
if (r != sizeof(current->clear_child_tid)) goto err;
bytes += r;
{ /* personality */
unsigned long tmp_personality = current->personality;
r = write_kern(ctx, file, &tmp_personality, sizeof(tmp_personality));
if (r != sizeof(tmp_personality)) goto err;
bytes += r;
}
/* XXX Will we need FUTEX related stuff here as well? */
/*--- Memory Information ---------------------------------------*/
if (!(flags & VMAD_DUMP_REGSONLY)) {
struct vm_area_struct *map, *next_map;
struct vmadump_mm_info mm_info;
struct mm_struct *mm = current->mm;
struct vmadump_vma_header term;
unsigned long next_addr;
#if HAVE_MM_MMAP_BASE
unsigned long mmap_base;
#endif
down_read(&mm->mmap_sem);
mm_info.start_code = mm->start_code;
mm_info.end_code = mm->end_code;
mm_info.start_data = mm->start_data;
mm_info.end_data = mm->end_data;
mm_info.start_brk = mm->start_brk;
mm_info.brk = mm->brk;
mm_info.start_stack = mm->start_stack;
mm_info.arg_start = mm->arg_start;
mm_info.arg_end = mm->arg_end;
mm_info.env_start = mm->env_start;
mm_info.env_end = mm->env_end;
#if HAVE_MM_MMAP_BASE
mmap_base = mm->mmap_base;
#endif
up_read(&mm->mmap_sem);
r = write_kern(ctx, file, &mm_info, sizeof(mm_info));
if (r != sizeof(mm_info)) goto err;
bytes += r;
#if HAVE_MM_MMAP_BASE
r = write_kern(ctx, file, &mmap_base, sizeof(mmap_base));
if (r != sizeof(mmap_base)) goto err;
bytes += r;
#endif
down_read(&mm->mmap_sem);
next_map = mm->mmap;
next_addr = next_map ? next_map->vm_start : 0;
while (next_map) {
/* Call vma_find() to find the map we're looking for. We
* have to do it this way because store_map needs to release
* the mmap_sem. */
map = find_vma(mm, next_addr);
if (map != next_map) break;
next_map = map->vm_next;
next_addr = next_map ? next_map->vm_start : 0;
r = store_map(ctx, file, map, flags);
if (r < 0) {
up_read(&mm->mmap_sem);
goto err;
}
bytes += r;
}
up_read(&mm->mmap_sem);
/* Terminate maps list */
term.start = term.end = ~0L;
r = write_kern(ctx, file, &term, sizeof(term));
if (r != sizeof(term)) goto err;
bytes += r;
}
#if 0 /* Hooks code not needed/maintained for BLCR */
/*--- Call freeze hooks ----------------------------------------*/
r = do_freeze_hooks(ctx, file, regs, flags);
if (r < 0) goto err;
bytes += r;
#endif
return bytes;
err:
if (r >= 0) r = -EIO; /* Map short writes to EIO */
return r;
}
/*--------------------------------------------------------------------
* syscall interface
*------------------------------------------------------------------*/
#if 0 /* Not needed/maintained for BLCR */
long do_vmadump(long op, long arg0, long arg1, struct pt_regs *regs) {
long retval;
struct file *file;
switch (op) {
case VMAD_DO_DUMP:
if (arg1 & ~VMAD_FLAG_USER_MASK) {
retval = -EINVAL;
break;
}
if ((file = fget(arg0))) {
retval = vmadump_freeze_proc(0, file, regs, arg1, 1);
fput(file);
} else
retval = -EBADF;
break;
case VMAD_DO_UNDUMP:
if ((file = fget(arg0))) {
retval = vmadump_thaw_proc(0, file, regs, 0, NULL);
fput(file);
} else
retval = -EBADF;
/* Un-dump is a whole lot like exec() */
if (retval == 0) {
if (current->euid == current->uid && current->egid == current->gid)
current->mm->dumpable = 1;
current->did_exec = 1;
current->self_exec_id++;
if (current->ptrace & PT_PTRACED)
send_sig(SIGTRAP, current, 0);
}
break;
case VMAD_DO_EXECDUMP: {
struct vmadump_execdump_args args;
char * filename;
if (copy_from_user(&args, (void *) arg0, sizeof(args))) {
retval = -EFAULT;
break;
}
if (args.flags & ~VMAD_FLAG_USER_MASK) {
retval = -EINVAL;
break;
}
filename = getname(args.arg0);
retval = PTR_ERR(filename);
if (IS_ERR(filename)) break;
file = fget(args.fd);
if (!file) {
retval = -EBADF;
putname(filename);
break;
}
retval = do_execve(filename, (char **)args.argv,
(char **)args.envp, regs);
putname(filename);
if (retval) {
fput(file);
break;
}
/* Check to make sure we're actually allowed to dump :) */
if (!current->mm->dumpable) {
fput(file);
do_exit(-EPERM);
}
retval = vmadump_freeze_proc(0, file, regs, args.flags, 1);
fput(file);
if (retval > 0) retval = 0;
do_exit(retval); /* Ok, we're done... */
/* NOT REACHED */
} break;
case VMAD_LIB_CLEAR:
case VMAD_LIB_ADD:
case VMAD_LIB_DEL:
case VMAD_LIB_LIST:
case VMAD_LIB_SIZE:
lock_kernel(); /* very very lazy... */
retval = do_lib_op(op, (char *) arg0, arg1);
unlock_kernel();
break;
default:
retval = -EINVAL;
}
return retval;
}
#endif
/*--------------------------------------------------------------------
* New binary format code
*------------------------------------------------------------------*/
#ifdef HAVE_BINFMT_VMADUMP
static
int load_vmadump(struct linux_binprm *bprm, struct pt_regs *regs) {
int retval;
struct vmadump_header *header;
header = (struct vmadump_header *) bprm->buf;
if (memcmp(header->magic, vmad_magic, sizeof(header->magic)) != 0 ||
header->fmt_vers != VMAD_FMT_VERS ||
header->major != ((LINUX_VERSION_CODE >> 16) & 0xFF) ||
header->minor != ((LINUX_VERSION_CODE >> 8) & 0xFF)
#if defined(STRICT_VERSION_CHECK) && STRICT_VERSION_CHECK
|| header->patch != (LINUX_VERSION_CODE & 0xFF)
#endif
)
return -ENOEXEC;
if (!bprm->file->f_op || !bprm->file->f_op->mmap)
return -ENOEXEC;
retval = vmadump_thaw_proc(0, bprm->file, regs, 0, NULL);
if (retval == 0) {
if (current->euid == current->uid && current->egid == current->gid)
current->mm->dumpable = 1;
current->did_exec = 1;
current->self_exec_id++;
#if 0
if (current->exec_domain && current->exec_domain->module)
__MOD_DEC_USE_COUNT(current->exec_domain->module);
if (current->binfmt && current->binfmt->module)
__MOD_DEC_USE_COUNT(current->binfmt->module);
current->exec_domain = 0;
#endif
current->binfmt = 0;
}
return retval;
}
struct linux_binfmt vmadump_fmt = {
0,THIS_MODULE,load_vmadump,0,0,0
};
#endif
/* This is some stuff that allows vmadump to latch onto the BProc
* syscall for testing purposes. */
#ifdef CONFIG_BPROC
static int syscall = 0;
MODULE_PARM(syscall, "i");
MODULE_PARM_DESC(syscall,
"Syscall number to allow calling VMADump directly. The default (0) means "
"no VMADump syscall. There is no bounds check on the syscall number so "
"be careful with this option.");
#endif
int __init vmadump_init_module(void) {
CR_INFO("vmadump: (from bproc-%s) Erik Hendriks "
"<erik@hendriks.cx>", __stringify(BPROC_VERSION));
CR_INFO("vmadump: Modified for %s <%s>",
PACKAGE_STRING, PACKAGE_BUGREPORT);
/* Check for correct blcr_imports */
if (strcmp(blcr_config_timestamp, BLCR_CONFIG_TIMESTAMP)) {
CR_ERR("vmadump: Module blcr_imports timestamp (%s) does not match that of blcr_vmadump (" BLCR_CONFIG_TIMESTAMP ").", blcr_config_timestamp);
return -EINVAL;
}
#if 0 /* Not needed/maintained for BLCR */
init_rwsem(&hook_lock);
#endif
#ifdef CONFIG_BPROC
{
/*extern struct rw_semaphore do_bproc_lock;*/
extern long (*do_bproc_ptr)(long,long,long,struct pt_regs *);
/*down_write(&do_bproc_lock);*/
do_bproc_ptr = 0;
if (syscall) {
if (do_bproc_ptr)
printk("vmadump: BProc syscall hook is occupied. "
"Can't attach to BProc syscall.\n");
else {
do_bproc_ptr = do_vmadump;
printk("vmadump: Attached to BProc syscall.\n");
}
}
/*up_write(&do_bproc_lock);*/
}
#endif
#ifdef HAVE_BINFMT_VMADUMP
register_binfmt(&vmadump_fmt);
#endif
return 0;
}
void __exit vmadump_cleanup_module(void) {
#if 0 /* Not needed/maintained for BLCR */
liblist_clear();
#endif
#ifdef HAVE_BINFMT_VMADUMP
unregister_binfmt(&vmadump_fmt);
#endif
#ifdef CONFIG_BPROC
{
/*extern struct rw_semaphore do_bproc_lock;*/
extern long (*do_bproc_ptr)(long,long,long,struct pt_regs *);
if (syscall) {
/*down_write(&do_bproc_lock);*/
if (do_bproc_ptr == do_vmadump)
do_bproc_ptr = 0;
/*up_write(&do_bproc_lock);*/
}
}
#endif
}
#if 0 /* EXPORTs are not needed/maintained for BLCR */
EXPORT_SYMBOL(vmadump_freeze_proc);
EXPORT_SYMBOL(vmadump_thaw_proc);
EXPORT_SYMBOL(do_vmadump);
EXPORT_SYMBOL(vmadump_add_hook);
EXPORT_SYMBOL(vmadump_del_hook);
EXPORT_SYMBOL(vmadump_read_u);
EXPORT_SYMBOL(vmadump_read_k);
EXPORT_SYMBOL(vmadump_write_u);
EXPORT_SYMBOL(vmadump_write_k);
#endif
/*
* Local variables:
* c-basic-offset: 4
* End:
*/
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