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fuse fixes for 5.12-rc4

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Merge tag 'fuse-fixes-5.12-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse

Pull fuse fixes from Miklos Szeredi:
 "Fix a deadlock and a couple of other bugs"

* tag 'fuse-fixes-5.12-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse:
  fuse: 32-bit user space ioctl compat for fuse device
  virtiofs: Fail dax mount if device does not support it
  fuse: fix live lock in fuse_iget()
This commit is contained in:
Linus Torvalds 2021-03-16 10:29:45 -07:00
commit 1df27313f5
4 changed files with 27 additions and 12 deletions
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26
fs/fuse/dev.c
View File

@ -2229,19 +2229,21 @@ static int fuse_device_clone(struct fuse_conn *fc, struct file *new)
static long fuse_dev_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
int err = -ENOTTY;
int res;
int oldfd;
struct fuse_dev *fud = NULL;
if (cmd == FUSE_DEV_IOC_CLONE) {
int oldfd;
if (_IOC_TYPE(cmd) != FUSE_DEV_IOC_MAGIC)
return -ENOTTY;
err = -EFAULT;
if (!get_user(oldfd, (__u32 __user *) arg)) {
switch (_IOC_NR(cmd)) {
case _IOC_NR(FUSE_DEV_IOC_CLONE):
res = -EFAULT;
if (!get_user(oldfd, (__u32 __user *)arg)) {
struct file *old = fget(oldfd);
err = -EINVAL;
res = -EINVAL;
if (old) {
struct fuse_dev *fud = NULL;
/*
* Check against file->f_op because CUSE
* uses the same ioctl handler.
@ -2252,14 +2254,18 @@ static long fuse_dev_ioctl(struct file *file, unsigned int cmd,
if (fud) {
mutex_lock(&fuse_mutex);
err = fuse_device_clone(fud->fc, file);
res = fuse_device_clone(fud->fc, file);
mutex_unlock(&fuse_mutex);
}
fput(old);
}
}
break;
default:
res = -ENOTTY;
break;
}
return err;
return res;
}
const struct file_operations fuse_dev_operations = {

1
fs/fuse/fuse_i.h
View File

@ -863,6 +863,7 @@ static inline u64 fuse_get_attr_version(struct fuse_conn *fc)
static inline void fuse_make_bad(struct inode *inode)
{
remove_inode_hash(inode);
set_bit(FUSE_I_BAD, &get_fuse_inode(inode)->state);
}

9
fs/fuse/virtio_fs.c
View File

@ -1324,8 +1324,15 @@ static int virtio_fs_fill_super(struct super_block *sb, struct fs_context *fsc)
/* virtiofs allocates and installs its own fuse devices */
ctx->fudptr = NULL;
if (ctx->dax)
if (ctx->dax) {
if (!fs->dax_dev) {
err = -EINVAL;
pr_err("virtio-fs: dax can't be enabled as filesystem"
" device does not support it.\n");
goto err_free_fuse_devs;
}
ctx->dax_dev = fs->dax_dev;
}
err = fuse_fill_super_common(sb, ctx);
if (err < 0)
goto err_free_fuse_devs;

3
include/uapi/linux/fuse.h
View File

@ -903,7 +903,8 @@ struct fuse_notify_retrieve_in {
};
/* Device ioctls: */
#define FUSE_DEV_IOC_CLONE _IOR(229, 0, uint32_t)
#define FUSE_DEV_IOC_MAGIC 229
#define FUSE_DEV_IOC_CLONE _IOR(FUSE_DEV_IOC_MAGIC, 0, uint32_t)
struct fuse_lseek_in {
uint64_t fh;