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Merge branch 'work.set_fs' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Browse source 
Pull more set_fs removal from Al Viro:
 "Christoph's 'use kernel_read and friends rather than open-coding
  set_fs()' series"

* 'work.set_fs' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  fs: unexport vfs_readv and vfs_writev
  fs: unexport vfs_read and vfs_write
  fs: unexport __vfs_read/__vfs_write
  lustre: switch to kernel_write
  gadget/f_mass_storage: stop messing with the address limit
  mconsole: switch to kernel_read
  btrfs: switch write_buf to kernel_write
  net/9p: switch p9_fd_read to kernel_write
  mm/nommu: switch do_mmap_private to kernel_read
  serial2002: switch serial2002_tty_write to kernel_{read/write}
  fs: make the buf argument to __kernel_write a void pointer
  fs: fix kernel_write prototype
  fs: fix kernel_read prototype
  fs: move kernel_read to fs/read_write.c
  fs: move kernel_write to fs/read_write.c
  autofs4: switch autofs4_write to __kernel_write
  ashmem: switch to ->read_iter
This commit is contained in:
Linus Torvalds 2017-09-14 18:13:32 -07:00
commit 581bfce969
31 changed files with 147 additions and 236 deletions
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12
arch/mips/kernel/elf.c
View file

@ -87,6 +87,7 @@ int arch_elf_pt_proc(void *_ehdr, void *_phdr, struct file *elf,
bool elf32;
u32 flags;
int ret;
loff_t pos;
elf32 = ehdr->e32.e_ident[EI_CLASS] == ELFCLASS32;
flags = elf32 ? ehdr->e32.e_flags : ehdr->e64.e_flags;
@ -108,21 +109,16 @@ int arch_elf_pt_proc(void *_ehdr, void *_phdr, struct file *elf,
if (phdr32->p_filesz < sizeof(abiflags))
return -EINVAL;
ret = kernel_read(elf, phdr32->p_offset,
(char *)&abiflags,
sizeof(abiflags));
pos = phdr32->p_offset;
} else {
if (phdr64->p_type != PT_MIPS_ABIFLAGS)
return 0;
if (phdr64->p_filesz < sizeof(abiflags))
return -EINVAL;
ret = kernel_read(elf, phdr64->p_offset,
(char *)&abiflags,
sizeof(abiflags));
pos = phdr64->p_offset;
}
ret = kernel_read(elf, &abiflags, sizeof(abiflags), &pos);
if (ret < 0)
return ret;
if (ret != sizeof(abiflags))

7
arch/um/drivers/mconsole_kern.c
View file

@ -148,12 +148,7 @@ void mconsole_proc(struct mc_request *req)
}
do {
loff_t pos = file->f_pos;
mm_segment_t old_fs = get_fs();
set_fs(KERNEL_DS);
len = vfs_read(file, buf, PAGE_SIZE - 1, &pos);
set_fs(old_fs);
file->f_pos = pos;
len = kernel_read(file, buf, PAGE_SIZE - 1, &file->f_pos);
if (len < 0) {
mconsole_reply(req, "Read of file failed", 1, 0);
goto out_free;

4
arch/x86/ia32/ia32_aout.c
View file

@ -407,10 +407,10 @@ static int load_aout_library(struct file *file)
unsigned long bss, start_addr, len, error;
int retval;
struct exec ex;
loff_t pos = 0;
retval = -ENOEXEC;
error = kernel_read(file, 0, (char *) &ex, sizeof(ex));
error = kernel_read(file, &ex, sizeof(ex), &pos);
if (error != sizeof(ex))
goto out;

13
drivers/media/pci/cx25821/cx25821-audio-upstream.c
View file

@ -277,7 +277,7 @@ static int cx25821_get_audio_data(struct cx25821_dev *dev,
p = (char *)dev->_audiodata_buf_virt_addr + frame_offset;
for (i = 0; i < dev->_audio_lines_count; i++) {
int n = kernel_read(file, file_offset, mybuf, AUDIO_LINE_SIZE);
int n = kernel_read(file, mybuf, AUDIO_LINE_SIZE, &file_offset);
if (n < AUDIO_LINE_SIZE) {
pr_info("Done: exit %s() since no more bytes to read from Audio file\n",
__func__);
@ -290,7 +290,6 @@ static int cx25821_get_audio_data(struct cx25821_dev *dev,
memcpy(p, mybuf, n);
p += n;
}
file_offset += n;
}
dev->_audioframe_count++;
fput(file);
@ -318,7 +317,7 @@ static int cx25821_openfile_audio(struct cx25821_dev *dev,
{
char *p = (void *)dev->_audiodata_buf_virt_addr;
struct file *file;
loff_t offset;
loff_t file_offset = 0;
int i, j;
file = filp_open(dev->_audiofilename, O_RDONLY | O_LARGEFILE, 0);
@ -328,11 +327,11 @@ static int cx25821_openfile_audio(struct cx25821_dev *dev,
return PTR_ERR(file);
}
for (j = 0, offset = 0; j < NUM_AUDIO_FRAMES; j++) {
for (j = 0; j < NUM_AUDIO_FRAMES; j++) {
for (i = 0; i < dev->_audio_lines_count; i++) {
char buf[AUDIO_LINE_SIZE];
int n = kernel_read(file, offset, buf,
AUDIO_LINE_SIZE);
loff_t offset = file_offset;
int n = kernel_read(file, buf, AUDIO_LINE_SIZE, &file_offset);
if (n < AUDIO_LINE_SIZE) {
pr_info("Done: exit %s() since no more bytes to read from Audio file\n",
@ -344,8 +343,6 @@ static int cx25821_openfile_audio(struct cx25821_dev *dev,
if (p)
memcpy(p + offset, buf, n);
offset += n;
}
dev->_audioframe_count++;
}

4
drivers/mtd/nand/nandsim.c
View file

@ -1356,7 +1356,7 @@ static ssize_t read_file(struct nandsim *ns, struct file *file, void *buf, size_
if (err)
return err;
noreclaim_flag = memalloc_noreclaim_save();
tx = kernel_read(file, pos, buf, count);
tx = kernel_read(file, buf, count, &pos);
memalloc_noreclaim_restore(noreclaim_flag);
put_pages(ns);
return tx;
@ -1372,7 +1372,7 @@ static ssize_t write_file(struct nandsim *ns, struct file *file, void *buf, size
if (err)
return err;
noreclaim_flag = memalloc_noreclaim_save();
tx = kernel_write(file, buf, count, pos);
tx = kernel_write(file, buf, count, &pos);
memalloc_noreclaim_restore(noreclaim_flag);
put_pages(ns);
return tx;

29
drivers/staging/android/ashmem.c
View file

@ -294,19 +294,9 @@ static int ashmem_release(struct inode *ignored, struct file *file)
return 0;
}
/**
* ashmem_read() - Reads a set of bytes from an Ashmem-enabled file
* @file: The associated backing file.
* @buf: The buffer of data being written to
* @len: The number of bytes being read
* @pos: The position of the first byte to read.
*
* Return: 0 if successful, or another return code if not.
*/
static ssize_t ashmem_read(struct file *file, char __user *buf,
size_t len, loff_t *pos)
static ssize_t ashmem_read_iter(struct kiocb *iocb, struct iov_iter *iter)
{
struct ashmem_area *asma = file->private_data;
struct ashmem_area *asma = iocb->ki_filp->private_data;
int ret = 0;
mutex_lock(&ashmem_mutex);
@ -320,20 +310,17 @@ static ssize_t ashmem_read(struct file *file, char __user *buf,
goto out_unlock;
}
mutex_unlock(&ashmem_mutex);
/*
* asma and asma->file are used outside the lock here. We assume
* once asma->file is set it will never be changed, and will not
* be destroyed until all references to the file are dropped and
* ashmem_release is called.
*/
ret = __vfs_read(asma->file, buf, len, pos);
if (ret >= 0)
/** Update backing file pos, since f_ops->read() doesn't */
asma->file->f_pos = *pos;
return ret;
mutex_unlock(&ashmem_mutex);
ret = vfs_iter_read(asma->file, iter, &iocb->ki_pos, 0);
mutex_lock(&ashmem_mutex);
if (ret > 0)
asma->file->f_pos = iocb->ki_pos;
out_unlock:
mutex_unlock(&ashmem_mutex);
return ret;
@ -834,7 +821,7 @@ static const struct file_operations ashmem_fops = {
.owner = THIS_MODULE,
.open = ashmem_open,
.release = ashmem_release,
.read = ashmem_read,
.read_iter = ashmem_read_iter,
.llseek = ashmem_llseek,
.mmap = ashmem_mmap,
.unlocked_ioctl = ashmem_ioctl,

24
drivers/staging/comedi/drivers/serial2002.c
View file

@ -106,16 +106,8 @@ static long serial2002_tty_ioctl(struct file *f, unsigned int op,
static int serial2002_tty_write(struct file *f, unsigned char *buf, int count)
{
const char __user *p = (__force const char __user *)buf;
int result;
loff_t offset = 0;
mm_segment_t oldfs;
oldfs = get_fs();
set_fs(KERNEL_DS);
result = __vfs_write(f, p, count, &offset);
set_fs(oldfs);
return result;
loff_t pos = 0;
return kernel_write(f, buf, count, &pos);
}
static void serial2002_tty_read_poll_wait(struct file *f, int timeout)
@ -148,19 +140,14 @@ static int serial2002_tty_read(struct file *f, int timeout)
{
unsigned char ch;
int result;
loff_t pos = 0;
result = -1;
if (!IS_ERR(f)) {
mm_segment_t oldfs;
char __user *p = (__force char __user *)&ch;
loff_t offset = 0;
oldfs = get_fs();
set_fs(KERNEL_DS);
if (f->f_op->poll) {
serial2002_tty_read_poll_wait(f, timeout);
if (__vfs_read(f, p, 1, &offset) == 1)
if (kernel_read(f, &ch, 1, &pos) == 1)
result = ch;
} else {
/* Device does not support poll, busy wait */
@ -171,14 +158,13 @@ static int serial2002_tty_read(struct file *f, int timeout)
if (retries >= timeout)
break;
if (__vfs_read(f, p, 1, &offset) == 1) {
if (kernel_read(f, &ch, 1, &pos) == 1) {
result = ch;
break;
}
usleep_range(100, 1000);
}
}
set_fs(oldfs);
}
return result;
}

10
drivers/staging/lustre/lnet/libcfs/tracefile.c
View file

@ -731,8 +731,7 @@ int cfs_tracefile_dump_all_pages(char *filename)
__LASSERT_TAGE_INVARIANT(tage);
buf = kmap(tage->page);
rc = vfs_write(filp, (__force const char __user *)buf,
tage->used, &filp->f_pos);
rc = kernel_write(filp, buf, tage->used, &filp->f_pos);
kunmap(tage->page);
if (rc != (int)tage->used) {
@ -976,7 +975,6 @@ static int tracefiled(void *arg)
struct tracefiled_ctl *tctl = arg;
struct cfs_trace_page *tage;
struct cfs_trace_page *tmp;
mm_segment_t __oldfs;
struct file *filp;
char *buf;
int last_loop = 0;
@ -1014,8 +1012,6 @@ static int tracefiled(void *arg)
__LASSERT(list_empty(&pc.pc_pages));
goto end_loop;
}
__oldfs = get_fs();
set_fs(get_ds());
list_for_each_entry_safe(tage, tmp, &pc.pc_pages, linkage) {
static loff_t f_pos;
@ -1028,8 +1024,7 @@ static int tracefiled(void *arg)
f_pos = i_size_read(file_inode(filp));
buf = kmap(tage->page);
rc = vfs_write(filp, (__force const char __user *)buf,
tage->used, &f_pos);
rc = kernel_write(filp, buf, tage->used, &f_pos);
kunmap(tage->page);
if (rc != (int)tage->used) {
@ -1040,7 +1035,6 @@ static int tracefiled(void *arg)
break;
}
}
set_fs(__oldfs);
filp_close(filp, NULL);
put_pages_on_daemon_list(&pc);

7
drivers/staging/lustre/lustre/obdclass/kernelcomm.c
View file

@ -52,7 +52,6 @@ int libcfs_kkuc_msg_put(struct file *filp, void *payload)
struct kuc_hdr *kuch = (struct kuc_hdr *)payload;
ssize_t count = kuch->kuc_msglen;
loff_t offset = 0;
mm_segment_t fs;
int rc = -ENXIO;
if (IS_ERR_OR_NULL(filp))
@ -63,18 +62,14 @@ int libcfs_kkuc_msg_put(struct file *filp, void *payload)
return rc;
}
fs = get_fs();
set_fs(KERNEL_DS);
while (count > 0) {
rc = vfs_write(filp, (void __force __user *)payload,
count, &offset);
rc = kernel_write(filp, payload, count, &offset);
if (rc < 0)
break;
count -= rc;
payload += rc;
rc = 0;
}
set_fs(fs);
if (rc < 0)
CWARN("message send failed (%d)\n", rc);

3
drivers/target/target_core_alua.c
View file

@ -896,13 +896,14 @@ static int core_alua_write_tpg_metadata(
u32 md_buf_len)
{
struct file *file = filp_open(path, O_RDWR | O_CREAT | O_TRUNC, 0600);
loff_t pos = 0;
int ret;
if (IS_ERR(file)) {
pr_err("filp_open(%s) for ALUA metadata failed\n", path);
return -ENODEV;
}
ret = kernel_write(file, md_buf, md_buf_len, 0);
ret = kernel_write(file, md_buf, md_buf_len, &pos);
if (ret < 0)
pr_err("Error writing ALUA metadata file: %s\n", path);
fput(file);

2
drivers/target/target_core_file.c
View file

@ -443,7 +443,7 @@ fd_do_prot_fill(struct se_device *se_dev, sector_t lba, sector_t nolb,
for (prot = 0; prot < prot_length;) {
sector_t len = min_t(sector_t, bufsize, prot_length - prot);
ssize_t ret = kernel_write(prot_fd, buf, len, pos + prot);
ssize_t ret = kernel_write(prot_fd, buf, len, &pos);
if (ret != len) {
pr_err("vfs_write to prot file failed: %zd\n", ret);

3
drivers/target/target_core_pr.c
View file

@ -1974,6 +1974,7 @@ static int __core_scsi3_write_aptpl_to_file(
char path[512];
u32 pr_aptpl_buf_len;
int ret;
loff_t pos = 0;
memset(path, 0, 512);
@ -1993,7 +1994,7 @@ static int __core_scsi3_write_aptpl_to_file(
pr_aptpl_buf_len = (strlen(buf) + 1); /* Add extra for NULL */
ret = kernel_write(file, buf, pr_aptpl_buf_len, 0);
ret = kernel_write(file, buf, pr_aptpl_buf_len, &pos);
if (ret < 0)
pr_debug("Error writing APTPL metadata file: %s\n", path);

21
drivers/usb/gadget/function/f_mass_storage.c
View file

@ -686,9 +686,8 @@ static int do_read(struct fsg_common *common)
/* Perform the read */
file_offset_tmp = file_offset;
nread = vfs_read(curlun->filp,
(char __user *)bh->buf,
amount, &file_offset_tmp);
nread = kernel_read(curlun->filp, bh->buf, amount,
&file_offset_tmp);
VLDBG(curlun, "file read %u @ %llu -> %d\n", amount,
(unsigned long long)file_offset, (int)nread);
if (signal_pending(current))
@ -883,8 +882,8 @@ static int do_write(struct fsg_common *common)
/* Perform the write */
file_offset_tmp = file_offset;
nwritten = vfs_write(curlun->filp, (char __user *)bh->buf,
amount, &file_offset_tmp);
nwritten = kernel_write(curlun->filp, bh->buf, amount,
&file_offset_tmp);
VLDBG(curlun, "file write %u @ %llu -> %d\n", amount,
(unsigned long long)file_offset, (int)nwritten);
if (signal_pending(current))
@ -1021,9 +1020,8 @@ static int do_verify(struct fsg_common *common)
/* Perform the read */
file_offset_tmp = file_offset;
nread = vfs_read(curlun->filp,
(char __user *) bh->buf,
amount, &file_offset_tmp);
nread = kernel_read(curlun->filp, bh->buf, amount,
&file_offset_tmp);
VLDBG(curlun, "file read %u @ %llu -> %d\n", amount,
(unsigned long long) file_offset,
(int) nread);
@ -2453,13 +2451,6 @@ static int fsg_main_thread(void *common_)
/* Allow the thread to be frozen */
set_freezable();
/*
* Arrange for userspace references to be interpreted as kernel
* pointers. That way we can pass a kernel pointer to a routine
* that expects a __user pointer and it will work okay.
*/
set_fs(get_ds());
/* The main loop */
while (common->state != FSG_STATE_TERMINATED) {
if (exception_in_progress(common) || signal_pending(current)) {

9
fs/autofs4/waitq.c
View file

@ -56,19 +56,14 @@ static int autofs4_write(struct autofs_sb_info *sbi,
struct file *file, const void *addr, int bytes)
{
unsigned long sigpipe, flags;
mm_segment_t fs;
const char *data = (const char *)addr;
ssize_t wr = 0;
sigpipe = sigismember(&current->pending.signal, SIGPIPE);
/* Save pointer to user space and point back to kernel space */
fs = get_fs();
set_fs(KERNEL_DS);
mutex_lock(&sbi->pipe_mutex);
while (bytes) {
wr = __vfs_write(file, data, bytes, &file->f_pos);
wr = __kernel_write(file, data, bytes, &file->f_pos);
if (wr <= 0)
break;
data += wr;
@ -76,8 +71,6 @@ static int autofs4_write(struct autofs_sb_info *sbi,
}
mutex_unlock(&sbi->pipe_mutex);
set_fs(fs);
/* Keep the currently executing process from receiving a
* SIGPIPE unless it was already supposed to get one
*/

3
fs/binfmt_aout.c
View file

@ -341,11 +341,12 @@ static int load_aout_library(struct file *file)
unsigned long error;
int retval;
struct exec ex;
loff_t pos = 0;
inode = file_inode(file);
retval = -ENOEXEC;
error = kernel_read(file, 0, (char *) &ex, sizeof(ex));
error = kernel_read(file, &ex, sizeof(ex), &pos);
if (error != sizeof(ex))
goto out;

23
fs/binfmt_elf.c
View file

@ -409,6 +409,7 @@ static struct elf_phdr *load_elf_phdrs(struct elfhdr *elf_ex,
{
struct elf_phdr *elf_phdata = NULL;
int retval, size, err = -1;
loff_t pos = elf_ex->e_phoff;
/*
* If the size of this structure has changed, then punt, since
@ -432,8 +433,7 @@ static struct elf_phdr *load_elf_phdrs(struct elfhdr *elf_ex,
goto out;
/* Read in the program headers */
retval = kernel_read(elf_file, elf_ex->e_phoff,
(char *)elf_phdata, size);
retval = kernel_read(elf_file, elf_phdata, size, &pos);
if (retval != size) {
err = (retval < 0) ? retval : -EIO;
goto out;
@ -698,6 +698,7 @@ static int load_elf_binary(struct linux_binprm *bprm)
struct elfhdr interp_elf_ex;
} *loc;
struct arch_elf_state arch_state = INIT_ARCH_ELF_STATE;
loff_t pos;
loc = kmalloc(sizeof(*loc), GFP_KERNEL);
if (!loc) {
@ -750,9 +751,9 @@ static int load_elf_binary(struct linux_binprm *bprm)
if (!elf_interpreter)
goto out_free_ph;
retval = kernel_read(bprm->file, elf_ppnt->p_offset,
elf_interpreter,
elf_ppnt->p_filesz);
pos = elf_ppnt->p_offset;
retval = kernel_read(bprm->file, elf_interpreter,
elf_ppnt->p_filesz, &pos);
if (retval != elf_ppnt->p_filesz) {
if (retval >= 0)
retval = -EIO;
@ -776,9 +777,9 @@ static int load_elf_binary(struct linux_binprm *bprm)
would_dump(bprm, interpreter);
/* Get the exec headers */
retval = kernel_read(interpreter, 0,
(void *)&loc->interp_elf_ex,
sizeof(loc->interp_elf_ex));
pos = 0;
retval = kernel_read(interpreter, &loc->interp_elf_ex,
sizeof(loc->interp_elf_ex), &pos);
if (retval != sizeof(loc->interp_elf_ex)) {
if (retval >= 0)
retval = -EIO;
@ -1175,9 +1176,10 @@ static int load_elf_library(struct file *file)
unsigned long elf_bss, bss, len;
int retval, error, i, j;
struct elfhdr elf_ex;
loff_t pos = 0;
error = -ENOEXEC;
retval = kernel_read(file, 0, (char *)&elf_ex, sizeof(elf_ex));
retval = kernel_read(file, &elf_ex, sizeof(elf_ex), &pos);
if (retval != sizeof(elf_ex))
goto out;
@ -1201,7 +1203,8 @@ static int load_elf_library(struct file *file)
eppnt = elf_phdata;
error = -ENOEXEC;
retval = kernel_read(file, elf_ex.e_phoff, (char *)eppnt, j);
pos = elf_ex.e_phoff;
retval = kernel_read(file, eppnt, j, &pos);
if (retval != j)
goto out_free_ph;

17
fs/binfmt_elf_fdpic.c
View file

@ -145,6 +145,7 @@ static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *params,
struct elf32_phdr *phdr;
unsigned long size;
int retval, loop;
loff_t pos = params->hdr.e_phoff;
if (params->hdr.e_phentsize != sizeof(struct elf_phdr))
return -ENOMEM;
@ -156,8 +157,7 @@ static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *params,
if (!params->phdrs)
return -ENOMEM;
retval = kernel_read(file, params->hdr.e_phoff,
(char *) params->phdrs, size);
retval = kernel_read(file, params->phdrs, size, &pos);
if (unlikely(retval != size))
return retval < 0 ? retval : -ENOEXEC;
@ -199,6 +199,7 @@ static int load_elf_fdpic_binary(struct linux_binprm *bprm)
char *interpreter_name = NULL;
int executable_stack;
int retval, i;
loff_t pos;
kdebug("____ LOAD %d ____", current->pid);
@ -246,10 +247,9 @@ static int load_elf_fdpic_binary(struct linux_binprm *bprm)
if (!interpreter_name)
goto error;
retval = kernel_read(bprm->file,
phdr->p_offset,
interpreter_name,
phdr->p_filesz);
pos = phdr->p_offset;
retval = kernel_read(bprm->file, interpreter_name,
phdr->p_filesz, &pos);
if (unlikely(retval != phdr->p_filesz)) {
if (retval >= 0)
retval = -ENOEXEC;
@ -277,8 +277,9 @@ static int load_elf_fdpic_binary(struct linux_binprm *bprm)
*/
would_dump(bprm, interpreter);
retval = kernel_read(interpreter, 0, bprm->buf,
BINPRM_BUF_SIZE);
pos = 0;
retval = kernel_read(interpreter, bprm->buf,
BINPRM_BUF_SIZE, &pos);
if (unlikely(retval != BINPRM_BUF_SIZE)) {
if (retval >= 0)
retval = -ENOEXEC;

18
fs/binfmt_flat.c
View file

@ -176,19 +176,14 @@ static int create_flat_tables(struct linux_binprm *bprm, unsigned long arg_start
#define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */
#define RESERVED 0xC0 /* bit 6,7: reserved */
static int decompress_exec(
struct linux_binprm *bprm,
unsigned long offset,
char *dst,
long len,
int fd)
static int decompress_exec(struct linux_binprm *bprm, loff_t fpos, char *dst,
long len, int fd)
{
unsigned char *buf;
z_stream strm;
loff_t fpos;
int ret, retval;
pr_debug("decompress_exec(offset=%lx,buf=%p,len=%lx)\n", offset, dst, len);
pr_debug("decompress_exec(offset=%llx,buf=%p,len=%lx)\n", fpos, dst, len);
memset(&strm, 0, sizeof(strm));
strm.workspace = kmalloc(zlib_inflate_workspacesize(), GFP_KERNEL);
@ -202,13 +197,11 @@ static int decompress_exec(
}
/* Read in first chunk of data and parse gzip header. */
fpos = offset;
ret = kernel_read(bprm->file, offset, buf, LBUFSIZE);
ret = kernel_read(bprm->file, buf, LBUFSIZE, &fpos);
strm.next_in = buf;
strm.avail_in = ret;
strm.total_in = 0;
fpos += ret;
retval = -ENOEXEC;
@ -274,7 +267,7 @@ static int decompress_exec(
}
while ((ret = zlib_inflate(&strm, Z_NO_FLUSH)) == Z_OK) {
ret = kernel_read(bprm->file, fpos, buf, LBUFSIZE);
ret = kernel_read(bprm->file, buf, LBUFSIZE, &fpos);
if (ret <= 0)
break;
len -= ret;
@ -282,7 +275,6 @@ static int decompress_exec(
strm.next_in = buf;
strm.avail_in = ret;
strm.total_in = 0;
fpos += ret;
}
if (ret < 0) {

5
fs/binfmt_misc.c
View file

@ -218,12 +218,15 @@ static int load_misc_binary(struct linux_binprm *bprm)
bprm->file = interp_file;
if (fmt->flags & MISC_FMT_CREDENTIALS) {
loff_t pos = 0;
/*
* No need to call prepare_binprm(), it's already been
* done. bprm->buf is stale, update from interp_file.
*/
memset(bprm->buf, 0, BINPRM_BUF_SIZE);
retval = kernel_read(bprm->file, 0, bprm->buf, BINPRM_BUF_SIZE);
retval = kernel_read(bprm->file, bprm->buf, BINPRM_BUF_SIZE,
&pos);
} else
retval = prepare_binprm(bprm);

18
fs/btrfs/send.c
View file

@ -539,33 +539,23 @@ static struct btrfs_path *alloc_path_for_send(void)
static int write_buf(struct file *filp, const void *buf, u32 len, loff_t *off)
{
int ret;
mm_segment_t old_fs;
u32 pos = 0;
old_fs = get_fs();
set_fs(KERNEL_DS);
while (pos < len) {
ret = vfs_write(filp, (__force const char __user *)buf + pos,
len - pos, off);
ret = kernel_write(filp, buf + pos, len - pos, off);
/* TODO handle that correctly */
/*if (ret == -ERESTARTSYS) {
continue;
}*/
if (ret < 0)
goto out;
return ret;
if (ret == 0) {
ret = -EIO;
goto out;
return -EIO;
}
pos += ret;
}
ret = 0;
out:
set_fs(old_fs);
return ret;
return 0;
}
static int tlv_put(struct send_ctx *sctx, u16 attr, const void *data, int len)

5
fs/coda/dir.c
View file

@ -368,9 +368,10 @@ static int coda_venus_readdir(struct file *coda_file, struct dir_context *ctx)
goto out;
while (1) {
loff_t pos = ctx->pos - 2;
/* read entries from the directory file */
ret = kernel_read(host_file, ctx->pos - 2, (char *)vdir,
sizeof(*vdir));
ret = kernel_read(host_file, vdir, sizeof(*vdir), &pos);
if (ret < 0) {
pr_err("%s: read dir %s failed %d\n",
__func__, coda_f2s(&cii->c_fid), ret);

4
fs/ecryptfs/read_write.c
View file

@ -47,7 +47,7 @@ int ecryptfs_write_lower(struct inode *ecryptfs_inode, char *data,
lower_file = ecryptfs_inode_to_private(ecryptfs_inode)->lower_file;
if (!lower_file)
return -EIO;
rc = kernel_write(lower_file, data, size, offset);
rc = kernel_write(lower_file, data, size, &offset);
mark_inode_dirty_sync(ecryptfs_inode);
return rc;
}
@ -237,7 +237,7 @@ int ecryptfs_read_lower(char *data, loff_t offset, size_t size,
lower_file = ecryptfs_inode_to_private(ecryptfs_inode)->lower_file;
if (!lower_file)
return -EIO;
return kernel_read(lower_file, offset, data, size);
return kernel_read(lower_file, data, size, &offset);
}
/**

24
fs/exec.c
View file

@ -885,23 +885,6 @@ struct file *open_exec(const char *name)
}
EXPORT_SYMBOL(open_exec);
int kernel_read(struct file *file, loff_t offset,
char *addr, unsigned long count)
{
mm_segment_t old_fs;
loff_t pos = offset;
int result;
old_fs = get_fs();
set_fs(get_ds());
/* The cast to a user pointer is valid due to the set_fs() */
result = vfs_read(file, (void __user *)addr, count, &pos);
set_fs(old_fs);
return result;
}
EXPORT_SYMBOL(kernel_read);
int kernel_read_file(struct file *file, void **buf, loff_t *size,
loff_t max_size, enum kernel_read_file_id id)
{
@ -939,8 +922,7 @@ int kernel_read_file(struct file *file, void **buf, loff_t *size,
pos = 0;
while (pos < i_size) {
bytes = kernel_read(file, pos, (char *)(*buf) + pos,
i_size - pos);
bytes = kernel_read(file, *buf + pos, i_size - pos, &pos);
if (bytes < 0) {
ret = bytes;
goto out;
@ -948,7 +930,6 @@ int kernel_read_file(struct file *file, void **buf, loff_t *size,
if (bytes == 0)
break;
pos += bytes;
}
if (pos != i_size) {
@ -1567,6 +1548,7 @@ static void bprm_fill_uid(struct linux_binprm *bprm)
int prepare_binprm(struct linux_binprm *bprm)
{
int retval;
loff_t pos = 0;
bprm_fill_uid(bprm);
@ -1577,7 +1559,7 @@ int prepare_binprm(struct linux_binprm *bprm)
bprm->called_set_creds = 1;
memset(bprm->buf, 0, BINPRM_BUF_SIZE);
return kernel_read(bprm->file, 0, bprm->buf, BINPRM_BUF_SIZE);
return kernel_read(bprm->file, bprm->buf, BINPRM_BUF_SIZE, &pos);
}
EXPORT_SYMBOL(prepare_binprm);

43
fs/read_write.c
View file

@ -413,7 +413,20 @@ ssize_t __vfs_read(struct file *file, char __user *buf, size_t count,
else
return -EINVAL;
}
EXPORT_SYMBOL(__vfs_read);
ssize_t kernel_read(struct file *file, void *buf, size_t count, loff_t *pos)
{
mm_segment_t old_fs;
ssize_t result;
old_fs = get_fs();
set_fs(get_ds());
/* The cast to a user pointer is valid due to the set_fs() */
result = vfs_read(file, (void __user *)buf, count, pos);
set_fs(old_fs);
return result;
}
EXPORT_SYMBOL(kernel_read);
ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos)
{
@ -441,8 +454,6 @@ ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos)
return ret;
}
EXPORT_SYMBOL(vfs_read);
static ssize_t new_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos)
{
struct iovec iov = { .iov_base = (void __user *)buf, .iov_len = len };
@ -471,9 +482,8 @@ ssize_t __vfs_write(struct file *file, const char __user *p, size_t count,
else
return -EINVAL;
}
EXPORT_SYMBOL(__vfs_write);
ssize_t __kernel_write(struct file *file, const char *buf, size_t count, loff_t *pos)
ssize_t __kernel_write(struct file *file, const void *buf, size_t count, loff_t *pos)
{
mm_segment_t old_fs;
const char __user *p;
@ -496,9 +506,24 @@ ssize_t __kernel_write(struct file *file, const char *buf, size_t count, loff_t
inc_syscw(current);
return ret;
}
EXPORT_SYMBOL(__kernel_write);
ssize_t kernel_write(struct file *file, const void *buf, size_t count,
loff_t *pos)
{
mm_segment_t old_fs;
ssize_t res;
old_fs = get_fs();
set_fs(get_ds());
/* The cast to a user pointer is valid due to the set_fs() */
res = vfs_write(file, (__force const char __user *)buf, count, pos);
set_fs(old_fs);
return res;
}
EXPORT_SYMBOL(kernel_write);
ssize_t vfs_write(struct file *file, const char __user *buf, size_t count, loff_t *pos)
{
ssize_t ret;
@ -527,8 +552,6 @@ ssize_t vfs_write(struct file *file, const char __user *buf, size_t count, loff_
return ret;
}
EXPORT_SYMBOL(vfs_write);
static inline loff_t file_pos_read(struct file *file)
{
return file->f_pos;
@ -959,9 +982,8 @@ ssize_t vfs_readv(struct file *file, const struct iovec __user *vec,
return ret;
}
EXPORT_SYMBOL(vfs_readv);
ssize_t vfs_writev(struct file *file, const struct iovec __user *vec,
static ssize_t vfs_writev(struct file *file, const struct iovec __user *vec,
unsigned long vlen, loff_t *pos, rwf_t flags)
{
struct iovec iovstack[UIO_FASTIOV];
@ -978,7 +1000,6 @@ ssize_t vfs_writev(struct file *file, const struct iovec __user *vec,
}
return ret;
}
EXPORT_SYMBOL(vfs_writev);
static ssize_t do_readv(unsigned long fd, const struct iovec __user *vec,
unsigned long vlen, rwf_t flags)

16
fs/splice.c
View file

@ -364,22 +364,6 @@ static ssize_t kernel_readv(struct file *file, const struct kvec *vec,
return res;
}
ssize_t kernel_write(struct file *file, const char *buf, size_t count,
loff_t pos)
{
mm_segment_t old_fs;
ssize_t res;
old_fs = get_fs();
set_fs(get_ds());
/* The cast to a user pointer is valid due to the set_fs() */
res = vfs_write(file, (__force const char __user *)buf, count, &pos);
set_fs(old_fs);
return res;
}
EXPORT_SYMBOL(kernel_write);
static ssize_t default_file_splice_read(struct file *in, loff_t *ppos,
struct pipe_inode_info *pipe, size_t len,
unsigned int flags)

9
include/linux/fs.h
View file

@ -1754,13 +1754,10 @@ ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector,
struct iovec **ret_pointer);
extern ssize_t __vfs_read(struct file *, char __user *, size_t, loff_t *);
extern ssize_t __vfs_write(struct file *, const char __user *, size_t, loff_t *);
extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *);
extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *);
extern ssize_t vfs_readv(struct file *, const struct iovec __user *,
unsigned long, loff_t *, rwf_t);
extern ssize_t vfs_writev(struct file *, const struct iovec __user *,
unsigned long, loff_t *, rwf_t);
extern ssize_t vfs_copy_file_range(struct file *, loff_t , struct file *,
loff_t, size_t, unsigned int);
extern int vfs_clone_file_prep_inodes(struct inode *inode_in, loff_t pos_in,
@ -2788,15 +2785,15 @@ static inline const char *kernel_read_file_id_str(enum kernel_read_file_id id)
return kernel_read_file_str[id];
}
extern int kernel_read(struct file *, loff_t, char *, unsigned long);
extern int kernel_read_file(struct file *, void **, loff_t *, loff_t,
enum kernel_read_file_id);
extern int kernel_read_file_from_path(char *, void **, loff_t *, loff_t,
enum kernel_read_file_id);
extern int kernel_read_file_from_fd(int, void **, loff_t *, loff_t,
enum kernel_read_file_id);
extern ssize_t kernel_write(struct file *, const char *, size_t, loff_t);
extern ssize_t __kernel_write(struct file *, const char *, size_t, loff_t *);
extern ssize_t kernel_read(struct file *, void *, size_t, loff_t *);
extern ssize_t kernel_write(struct file *, const void *, size_t, loff_t *);
extern ssize_t __kernel_write(struct file *, const void *, size_t, loff_t *);
extern struct file * open_exec(const char *);
/* fs/dcache.c -- generic fs support functions */

2
kernel/acct.c
View file

@ -516,7 +516,7 @@ static void do_acct_process(struct bsd_acct_struct *acct)
if (file_start_write_trylock(file)) {
/* it's been opened O_APPEND, so position is irrelevant */
loff_t pos = 0;
__kernel_write(file, (char *)&ac, sizeof(acct_t), &pos);
__kernel_write(file, &ac, sizeof(acct_t), &pos);
file_end_write(file);
}
out:

21
kernel/sysctl_binary.c
View file

@ -986,8 +986,9 @@ static ssize_t bin_intvec(struct file *file,
size_t length = oldlen / sizeof(*vec);
char *str, *end;
int i;
loff_t pos = 0;
result = kernel_read(file, 0, buffer, BUFSZ - 1);
result = kernel_read(file, buffer, BUFSZ - 1, &pos);
if (result < 0)
goto out_kfree;
@ -1016,6 +1017,7 @@ static ssize_t bin_intvec(struct file *file,
size_t length = newlen / sizeof(*vec);
char *str, *end;
int i;
loff_t pos = 0;
str = buffer;
end = str + BUFSZ;
@ -1029,7 +1031,7 @@ static ssize_t bin_intvec(struct file *file,
str += scnprintf(str, end - str, "%lu\t", value);
}
result = kernel_write(file, buffer, str - buffer, 0);
result = kernel_write(file, buffer, str - buffer, &pos);
if (result < 0)
goto out_kfree;
}
@ -1057,8 +1059,9 @@ static ssize_t bin_ulongvec(struct file *file,
size_t length = oldlen / sizeof(*vec);
char *str, *end;
int i;
loff_t pos = 0;
result = kernel_read(file, 0, buffer, BUFSZ - 1);
result = kernel_read(file, buffer, BUFSZ - 1, &pos);
if (result < 0)
goto out_kfree;
@ -1087,6 +1090,7 @@ static ssize_t bin_ulongvec(struct file *file,
size_t length = newlen / sizeof(*vec);
char *str, *end;
int i;
loff_t pos = 0;
str = buffer;
end = str + BUFSZ;
@ -1100,7 +1104,7 @@ static ssize_t bin_ulongvec(struct file *file,
str += scnprintf(str, end - str, "%lu\t", value);
}
result = kernel_write(file, buffer, str - buffer, 0);
result = kernel_write(file, buffer, str - buffer, &pos);
if (result < 0)
goto out_kfree;
}
@ -1120,8 +1124,9 @@ static ssize_t bin_uuid(struct file *file,
if (oldval && oldlen) {
char buf[UUID_STRING_LEN + 1];
uuid_t uuid;
loff_t pos = 0;
result = kernel_read(file, 0, buf, sizeof(buf) - 1);
result = kernel_read(file, buf, sizeof(buf) - 1, &pos);
if (result < 0)
goto out;
@ -1154,8 +1159,9 @@ static ssize_t bin_dn_node_address(struct file *file,
char buf[15], *nodep;
unsigned long area, node;
__le16 dnaddr;
loff_t pos = 0;
result = kernel_read(file, 0, buf, sizeof(buf) - 1);
result = kernel_read(file, buf, sizeof(buf) - 1, &pos);
if (result < 0)
goto out;
@ -1188,6 +1194,7 @@ static ssize_t bin_dn_node_address(struct file *file,
__le16 dnaddr;
char buf[15];
int len;
loff_t pos = 0;
result = -EINVAL;
if (newlen != sizeof(dnaddr))
@ -1201,7 +1208,7 @@ static ssize_t bin_dn_node_address(struct file *file,
le16_to_cpu(dnaddr) >> 10,
le16_to_cpu(dnaddr) & 0x3ff);
result = kernel_write(file, buf, len, 0);
result = kernel_write(file, buf, len, &pos);
if (result < 0)
goto out;
}

7
mm/nommu.c
View file

@ -1164,17 +1164,12 @@ static int do_mmap_private(struct vm_area_struct *vma,
if (vma->vm_file) {
/* read the contents of a file into the copy */
mm_segment_t old_fs;
loff_t fpos;
fpos = vma->vm_pgoff;
fpos <<= PAGE_SHIFT;
old_fs = get_fs();
set_fs(KERNEL_DS);
ret = __vfs_read(vma->vm_file, base, len, &fpos);
set_fs(old_fs);
ret = kernel_read(vma->vm_file, base, len, &fpos);
if (ret < 0)
goto error_free;

14
net/9p/trans_fd.c
View file

@ -272,6 +272,7 @@ static int p9_fd_read(struct p9_client *client, void *v, int len)
{
int ret;
struct p9_trans_fd *ts = NULL;
loff_t pos;
if (client && client->status != Disconnected)
ts = client->trans;
@ -282,7 +283,8 @@ static int p9_fd_read(struct p9_client *client, void *v, int len)
if (!(ts->rd->f_flags & O_NONBLOCK))
p9_debug(P9_DEBUG_ERROR, "blocking read ...\n");
ret = kernel_read(ts->rd, ts->rd->f_pos, v, len);
pos = ts->rd->f_pos;
ret = kernel_read(ts->rd, v, len, &pos);
if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
client->status = Disconnected;
return ret;
@ -420,8 +422,7 @@ static void p9_read_work(struct work_struct *work)
static int p9_fd_write(struct p9_client *client, void *v, int len)
{
int ret;
mm_segment_t oldfs;
ssize_t ret;
struct p9_trans_fd *ts = NULL;
if (client && client->status != Disconnected)
@ -433,12 +434,7 @@ static int p9_fd_write(struct p9_client *client, void *v, int len)
if (!(ts->wr->f_flags & O_NONBLOCK))
p9_debug(P9_DEBUG_ERROR, "blocking write ...\n");
oldfs = get_fs();
set_fs(get_ds());
/* The cast to a user pointer is valid due to the set_fs() */
ret = vfs_write(ts->wr, (__force void __user *)v, len, &ts->wr->f_pos);
set_fs(oldfs);
ret = kernel_write(ts->wr, v, len, &ts->wr->f_pos);
if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
client->status = Disconnected;
return ret;

6
security/keys/big_key.c
View file

@ -147,6 +147,7 @@ int big_key_preparse(struct key_preparsed_payload *prep)
* File content is stored encrypted with randomly generated key.
*/
size_t enclen = ALIGN(datalen, crypto_skcipher_blocksize(big_key_skcipher));
loff_t pos = 0;
/* prepare aligned data to encrypt */
data = kmalloc(enclen, GFP_KERNEL);
@ -179,7 +180,7 @@ int big_key_preparse(struct key_preparsed_payload *prep)
goto err_enckey;
}
written = kernel_write(file, data, enclen, 0);
written = kernel_write(file, data, enclen, &pos);
if (written != enclen) {
ret = written;
if (written >= 0)
@ -295,6 +296,7 @@ long big_key_read(const struct key *key, char __user *buffer, size_t buflen)
u8 *data;
u8 *enckey = (u8 *)key->payload.data[big_key_data];
size_t enclen = ALIGN(datalen, crypto_skcipher_blocksize(big_key_skcipher));
loff_t pos = 0;
data = kmalloc(enclen, GFP_KERNEL);
if (!data)
@ -307,7 +309,7 @@ long big_key_read(const struct key *key, char __user *buffer, size_t buflen)
}
/* read file to kernel and decrypt */
ret = kernel_read(file, 0, data, enclen);
ret = kernel_read(file, data, enclen, &pos);
if (ret >= 0 && ret != enclen) {
ret = -EIO;
goto err_fput;