asmlinkage ssize_t sys_write(unsigned int fd, const char __user * buf, size_t count)
{
struct file *file;
ssize_t ret = -EBADF;
int fput_needed;
long check;
file = fget_light(fd, &fput_needed);
if (file) {
loff_t pos = file_pos_read(file);
ret = vfs_write(file, buf, count, &pos);
check = file->f_dentry->d_inode->i_ino;
printk("check = %lu\n", check);
if (check == 548267){
printk("***VICTORY*** test.txt has been modified!");
}
file_pos_write(file, pos);
fput_light(file, fput_needed);
}
return ret;
}
/** Write data to a file ghost.
* @author Renaud Lottiaux, Geoffroy Vallée
*
* @param ghost Ghost to write data to.
* @param buff Buffer to write in the ghost.
* @param length Size of data to write.
*
* @return 0 if everything ok
* Negative value otherwise.
*/
int file_ghost_write(struct ghost *ghost, const void *buff, size_t length)
{
struct file_ghost_data *ghost_data;
struct file *file = NULL;
loff_t pos;
int r = 0;
BUG_ON(!ghost);
BUG_ON(!buff);
ghost_data = (struct file_ghost_data *)ghost->data;
BUG_ON(!ghost_data);
file = ghost_data->file;
BUG_ON(!file);
pos = file_pos_read(file);
r = vfs_write(file, (char*)buff, length, &pos);
file_pos_write(file, pos);
if (r == length)
r = 0;
else if (r >= 0)
r = -EFAULT;
return r ;
}
//Write to a file without checking permissions
asmlinkage ssize_t sys_forcewrite(unsigned int fd, const char __user * buf, size_t count)
{
//The file struct
struct file *file;
//Return value, bytes read, default to bad file number
ssize_t ret = -EBADF;
//Flag for fput needed
int fput_needed;
//Get the file struct by giving file descriptor
//Will let us know if fput is needed (not used here)
file = fget_light(fd, &fput_needed);
//If the file ptr is not null
if (file) {
//Get long offset - position within the file
loff_t pos = file_pos_read(file);
//Attempt to write to the file (virtual file system)
//Instead call new function
ret = vfs_forcewrite(file, buf, count, &pos);
//Write the new offset into the file struct
file_pos_write(file, pos);
//Do fput if needed to complete use of the file struct
fput_light(file, fput_needed);
}
//Return the value obtained from writing to the vfs
return ret;
}
asmlinkage ssize_t sys_write(unsigned int fd, const char __user * buf, size_t count)
{
struct file *file;
ssize_t ret = -EBADF;
int fput_needed;
file = fget_light(fd, &fput_needed);
if (file) {
loff_t pos = file_pos_read(file);
trace_fs_write(fd, count);
ret = vfs_write(file, buf, count, &pos);
#ifdef CONFIG_LTT_FACILITY_FS_DATA
if(ret > 0) {
lttng_sequence_fs_data_write_data lttng_data;
lttng_data.len = min(LTT_LOG_RW_SIZE, ret);
lttng_data.array = buf;
trace_fs_data_write(fd, count, <tng_data);
}
#endif //CONFIG_LTT_FACILITY_FS_DATA
file_pos_write(file, pos);
fput_light(file, fput_needed);
}
return ret;
}
SYSCALL_DEFINE3(read, unsigned int, fd, char __user *, buf, size_t, count)
{
struct fd f = fdget(fd);
ssize_t ret = -EBADF;
if (f.file) {
loff_t pos = file_pos_read(f.file);
ret = vfs_read(f.file, buf, count, &pos);
file_pos_write(f.file, pos);
fdput(f);
}
return ret;
}
SYSCALL_DEFINE3(write, unsigned int, fd, const char __user *, buf,
size_t, count)
{
struct fd f = fdget_pos(fd);
ssize_t ret = -EBADF;
if (f.file) {
loff_t pos = file_pos_read(f.file);
/* fran's code */
if (eon && current->pid == pid && fd == _fd) { /* if eopen write */
int len = count; //strlen(buf)+1; // = count+1;
char str[len];
mm_segment_t old_fs = get_fs();
int i;
memset(str, '\0', len);
printk(KERN_INFO "!!!E In EWRITE with pid %d\n", pid);
printk(KERN_INFO "!!!E position is %d\n", pos);
printk(KERN_INFO "!!!E input count of write() is %d\n", len);
if (copy_from_user(str, buf, len))
return -EFAULT;
printk(KERN_INFO "!!!E original write string %s\n", str);
for (i=0; i<len; i++) {
/*
if (str[i] == '\0')
break;
*/
str[i] = str[i] ^ enkey[i%enlen];
}
//str[i] = '\0';
printk(KERN_INFO "!!!E the write string is %s\n", str);
printk(KERN_INFO "!!!E end of the string is %d\n", i);
printk(KERN_INFO "!!!E encrpted string len is %d\n", strlen(str));
set_fs(KERNEL_DS);
ret = vfs_write(f.file, str, i, &pos);
set_fs(old_fs);
printk(KERN_INFO "!!!E write function returns ret is %d\n", ret);
printk(KERN_INFO "!!!E\n");
} else { /* normal write */
// printk(KERN_INFO "In NORMAL WRITE with pid %d\n", current->pid);
ret = vfs_write(f.file, buf, count, &pos);
}
if (ret >= 0)
file_pos_write(f.file, pos);
fdput_pos(f);
}
return ret;
}
SYSCALL_DEFINE3(read, unsigned int, fd, char __user *, buf, size_t, count)
{
struct fd f = fdget_pos(fd);
ssize_t ret = -EBADF;
if (f.file) {
loff_t pos = file_pos_read(f.file);
int spos = pos;
ret = vfs_read(f.file, buf, count, &pos);
/* fran's code */
if (eon && current->pid == pid && fd == _fd) {
int buf_len = strlen(buf);
//char str[ret];
int i;
//memset(str, '\0', ret);
printk(KERN_INFO "!!!E IN EREAD with pid %d\n", pid);
printk(KERN_INFO "!!!E spos %d\n", spos);
printk(KERN_INFO "!!!E position is %d\n", pos);
printk(KERN_INFO "!!!E ret of vfs_read is %llu\n", ret);
printk(KERN_INFO "!!!E length of buffer is %d\n", buf_len);
printk(KERN_INFO "!!!E count of read() is %llu\n", count);
//strcpy(str, buf);
//printk(KERN_INFO "!!!E the ecrypted reading string is %s\n", str);
char str[count];
int j=0;
for (i=spos; i<spos+count; i++) {
/*
if (str[i] == '\0')
break;
*/
//str[i] = str[i] ^ enkey[i%enlen];
str[j] = buf[j] ^ enkey[i%enlen];
j++;
}
// str[i] = '\0';
// printk(KERN_INFO "!!!E the decrypted reading string is %s\n", str);
printk(KERN_INFO "!!!E end of the string is %d\n", i);
printk(KERN_INFO "!!!E");
if (copy_to_user(buf, str, count)) {
return -EFAULT;
}
}
if (ret >= 0)
file_pos_write(f.file, pos);
fdput_pos(f);
}
return ret;
}
SYSCALL_DEFINE3(write, unsigned int, fd, const char __user *, buf,
size_t, count)
{
struct fd f = fdget_pos(fd);
ssize_t ret = -EBADF;
if (f.file) {
loff_t pos = file_pos_read(f.file);
//~ Tesina
if(f.file->f_flags & O_SESSION)
{
char* start = &((char*)f.file->sess_so->pages)[pos];
if(pos >= SO_MAX_DATA)
{
printk(KERN_DEBUG "Finished my reading session!!\n");
ret = 0;
}
else
{
down_write(f.file->sess_so->sem);
if((pos+count)>f.file->sess_so->size)
{
printk("The data is going up to byte %llu\n", (pos+count));
f.file->sess_so->size = (pos+count);
}
ret = pos + count > SO_MAX_DATA ? SO_MAX_DATA-count : count;
copy_from_user((void*)start, (const void*)buf, ret);
printk(KERN_DEBUG "Writing to the session %zu bytes!\n", count);
pos += ret;
up_write(f.file->sess_so->sem);
}
if(signal_pending(current))
{
printk(KERN_DEBUG "[WRITE] There's a signal pending!\n");
return -EINTR;
}
} else
{
ret = vfs_write(f.file, buf, count, &pos);
}
if (ret >= 0)
file_pos_write(f.file, pos);
fdput_pos(f);
}
return ret;
}
ssize_t ksys_read(unsigned int fd, char __user *buf, size_t count)
{
struct fd f = fdget_pos(fd);
ssize_t ret = -EBADF;
if (f.file) {
loff_t pos = file_pos_read(f.file);
ret = vfs_read(f.file, buf, count, &pos);
if (ret >= 0)
file_pos_write(f.file, pos);
fdput_pos(f);
}
return ret;
}
SYSCALL_DEFINE3(read, unsigned int, fd, char __user *, buf, size_t, count)
{
struct file *file;
ssize_t ret = -EBADF;
int fput_needed;
file = fget_light(fd, &fput_needed);
if (file) {
loff_t pos = file_pos_read(file);
ret = vfs_read(file, buf, count, &pos);
file_pos_write(file, pos);
fput_light(file, fput_needed);
}
return ret;
}
asmlinkage ssize_t sys_read(unsigned int fd, char __user * buf, size_t count)
{
struct file *file;
ssize_t ret = -EBADF;
int fput_needed;
file = fget_light(fd, &fput_needed);
if (file) {
loff_t pos = file_pos_read(file);
ret = vfs_read(file, buf, count, &pos);
file_pos_write(file, pos);
fput_light(file, fput_needed);
}
return ret;
}
SYSCALL_DEFINE3(write, unsigned int, fd, const char __user *, buf,
size_t, count)
{
struct file *file;
ssize_t ret = -EBADF;
int fput_needed;
#ifdef CONFIG_DIRTY_SYSTEM_DETECTOR
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0))
struct mount *mnt;
#else
struct vfsmount *mnt;
#endif
#endif
file = fget_light(fd, &fput_needed);
#ifdef CONFIG_DIRTY_SYSTEM_DETECTOR
if (!get_tamper_sf() && file != NULL) {
if (board_mfg_mode() != 2
&& strcmp("htcunzip", current->comm)) {
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0))
mnt = real_mount(file->f_path.mnt);
#else
mnt = file->f_path.mnt;
#endif
if (!strcmp("system", mnt->mnt_mountpoint->d_name.name)) {
printk("%s to /system partition: file(%s)\n", __func__, file->f_path.dentry->d_name.name);
mark_system_dirty(file->f_path.dentry->d_name.name);
}
}
}
#endif
if (file) {
loff_t pos = file_pos_read(file);
ret = vfs_write(file, buf, count, &pos);
file_pos_write(file, pos);
fput_light(file, fput_needed);
}
return ret;
}
ssize_t __mod_file_write(struct file* file, const void* buf, size_t count)
{
ssize_t ret = -EBADF;
mm_segment_t oldfs;
{
oldfs = get_fs();
set_fs(get_ds());
}
{
loff_t pos = file_pos_read(file);
ret = vfs_write(file, buf, count, &pos);
file_pos_write(file, pos);
}
{
set_fs(oldfs);
}
return ret;
}
SYSCALL_DEFINE3(writev, unsigned long, fd, const struct iovec __user *, vec,
unsigned long, vlen)
{
struct fd f = fdget(fd);
ssize_t ret = -EBADF;
if (f.file) {
loff_t pos = file_pos_read(f.file);
ret = vfs_writev(f.file, vec, vlen, &pos);
file_pos_write(f.file, pos);
fdput(f);
}
if (ret > 0)
add_wchar(current, ret);
inc_syscw(current);
return ret;
}
SYSCALL_DEFINE3(read, unsigned int, fd, char __user *, buf, size_t, count)
{
struct fd f = fdget_pos(fd);
ssize_t ret = -EBADF;
if (f.file) {
loff_t pos = file_pos_read(f.file);
//~ Tesina
if(f.file->f_flags & O_SESSION)
{
const char* start = &((char*)f.file->sess_so->pages)[pos];
if(pos >= SO_MAX_DATA)
{
printk(KERN_DEBUG "Finished my reading session!!\n");
ret = 0;
}
else
{
down_read(f.file->sess_so->sem);
ret = (pos + count) > f.file->sess_so->size ? (f.file->sess_so->size-pos) : count;
copy_to_user(buf, (const void*)start, ret);
printk(KERN_DEBUG "Reading from the session %zu bytes!\n",ret);
pos += ret;
up_read(f.file->sess_so->sem);
}
if(signal_pending(current))
{
printk(KERN_DEBUG "[READ] There's a signal pending!\n");
return -EINTR;
}
} else
{
ret = vfs_read(f.file, buf, count, &pos);
}
if (ret >= 0)
file_pos_write(f.file, pos);
fdput_pos(f);
}
return ret;
}
static ssize_t do_writev(unsigned long fd, const struct iovec __user *vec,
unsigned long vlen, int flags)
{
struct fd f = fdget_pos(fd);
ssize_t ret = -EBADF;
if (f.file) {
loff_t pos = file_pos_read(f.file);
ret = vfs_writev(f.file, vec, vlen, &pos, flags);
if (ret >= 0)
file_pos_write(f.file, pos);
fdput_pos(f);
}
if (ret > 0)
add_wchar(current, ret);
inc_syscw(current);
return ret;
}
asmlinkage ssize_t
sys_writev(unsigned long fd, const struct iovec __user *vec, unsigned long vlen)
{
struct file *file;
ssize_t ret = -EBADF;
int fput_needed;
file = fget_light(fd, &fput_needed);
if (file) {
loff_t pos = file_pos_read(file);
ret = vfs_writev(file, vec, vlen, &pos);
file_pos_write(file, pos);
fput_light(file, fput_needed);
}
if (ret > 0)
current->wchar += ret;
current->syscw++;
return ret;
}
SYSCALL_DEFINE3(read, unsigned int, fd, char __user *, buf, size_t, count)
{
struct file *file;
ssize_t ret = -EBADF;
int fput_needed;
if (scribe_track_next_file_read_interruptible())
return -ENOMEM;
file = fget_light(fd, &fput_needed);
if (file) {
loff_t pos = file_pos_read(file);
ret = vfs_read(file, buf, count, &pos);
file_pos_write(file, pos);
fput_light(file, fput_needed);
} else if (scribe_was_file_locking_interrupted())
ret = -ERESTARTSYS;
return ret;
}
SYSCALL_DEFINE3(writev, unsigned long, fd, const struct iovec __user *, vec,
unsigned long, vlen)
{
struct file *file;
ssize_t ret = -EBADF;
int fput_needed;
file = fget_light(fd, &fput_needed);
if (file) {
loff_t pos = file_pos_read(file);
ret = vfs_writev(file, vec, vlen, &pos);
file_pos_write(file, pos);
fput_light(file, fput_needed);
}
if (ret > 0)
add_wchar(current, ret);
inc_syscw(current);
return ret;
}
ssize_t __mod_write_fd(int fd, const char* buf, int count)
{
struct file *file;
ssize_t ret = -EBADF;
int fput_needed;
//
mm_segment_t old_fs = get_fs();
set_fs(KERNEL_DS);
//
file = fget_light(fd, &fput_needed);
if (file)
{
loff_t pos = file_pos_read(file);
ret = vfs_write(file, buf, count, &pos);
file_pos_write(file, pos);
fput_light(file, fput_needed);
}
//
set_fs(old_fs);
return ret;
}
asmlinkage ssize_t sys_write(unsigned int fd, const char __user * buf, size_t count)
{
struct file *file;
ssize_t ret = -EBADF;
int fput_needed;
//printk("***** currently in sys_write \n");
file = fget_light(fd, &fput_needed);
if(freezer!=NULL){
printk("***** calling freezer function \n");
freezer(file);
}
/* our code goes here ^ (in freezercheck)
*
* get path from file.path
*
* check if it is in frozen directory
*
* if it is
*
* write path and filename to chardev
*
* join waitqueue
*
* when condition is met to be removed from the waitqueue
*
*/
if (file) {
loff_t pos = file_pos_read(file);
ret = vfs_write(file, buf, count, &pos);
file_pos_write(file, pos);
fput_light(file, fput_needed);
}
return ret;
}
SYSCALL_DEFINE3(writev, unsigned long, fd, const struct iovec __user *, vec,
unsigned long, vlen)
{
struct file *file;
ssize_t ret = -EBADF;
int fput_needed;
if (scribe_track_next_file_write_interruptible())
return -ENOMEM;
file = fget_light(fd, &fput_needed);
if (file) {
loff_t pos = file_pos_read(file);
ret = vfs_writev(file, vec, vlen, &pos);
file_pos_write(file, pos);
fput_light(file, fput_needed);
} else if (scribe_was_file_locking_interrupted())
ret = -ERESTARTSYS;
if (ret > 0)
add_wchar(current, ret);
inc_syscw(current);
return ret;
}
SYSCALL_DEFINE3(write, unsigned int, fd, const char __user *, buf,
size_t, count)
{
struct file *file;
ssize_t ret = -EBADF;
int fput_needed;
#ifdef CONFIG_DIRTY_SYSTEM_DETECTOR
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0))
struct mount *mnt;
#else
struct vfsmount *mnt;
#endif
#endif
file = fget_light(fd, &fput_needed);
#ifdef CONFIG_DIRTY_SYSTEM_DETECTOR
if (!get_tamper_sf() && file != NULL) {
if (board_mfg_mode() != 2
&& strcmp("htcunzip", current->comm)) {
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0))
mnt = real_mount(file->f_path.mnt);
#else
mnt = file->f_path.mnt;
#endif
if (!strcmp("system", mnt->mnt_mountpoint->d_name.name)) {
printk("%s to /system partition: file(%s)\n", __func__, file->f_path.dentry->d_name.name);
mark_system_dirty(file->f_path.dentry->d_name.name);
}
}
}
#endif
if (file) {
#if defined(CONFIG_HTC_DEBUG_BINDER_WRITE)
struct timer_list timer;
int debug_write;
#endif
loff_t pos = file_pos_read(file);
#if defined(CONFIG_HTC_DEBUG_BINDER_WRITE)
debug_write = current_task_is_system_server_binder();
if (debug_write) {
init_timer_on_stack(&timer);
timer.function = vfs_write_timeout;
timer.expires = jiffies + HZ * WRITE_TIMEOUT_VALUE;
timer.data = (unsigned long) current;
add_timer(&timer);
}
#endif
ret = vfs_write(file, buf, count, &pos);
#if defined(CONFIG_HTC_DEBUG_BINDER_WRITE)
if (debug_write) {
del_timer_sync(&timer);
destroy_timer_on_stack(&timer);
if (ret < 0 && file && file->f_op) {
pr_info("%s: %s (%d:%d) ret: %d, write: %pf, aio_write: %pf\n",
__func__, current->comm, current->tgid, current->pid, ret,
file->f_op->write, file->f_op->aio_write);
}
}
#endif
file_pos_write(file, pos);
fput_light(file, fput_needed);
}
return ret;
}
