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eCryptfs: Handle ioctl calls with unlocked and compat functions

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Lower filesystems that only implemented unlocked_ioctl weren't being
passed ioctl calls because eCryptfs only checked for
lower_file->f_op->ioctl and returned -ENOTTY if it was NULL.

eCryptfs shouldn't implement ioctl(), since it doesn't require the BKL.
This patch introduces ecryptfs_unlocked_ioctl() and
ecryptfs_compat_ioctl(), which passes the calls on to the lower file
system.

https://bugs.launchpad.net/ecryptfs/+bug/469664

Reported-by: James Dupin <james.dupin@gmail.com>
Cc: stable@kernel.org
Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
This commit is contained in:
Tyler Hicks 2009-11-03 11:45:11 -06:00
parent a1275c3b21
commit c43f7b8fb0
1 changed files with 35 additions and 21 deletions
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56
fs/ecryptfs/file.c
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@ -292,12 +292,40 @@ static int ecryptfs_fasync(int fd, struct file *file, int flag)
return rc;
}
static int ecryptfs_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg);
static long
ecryptfs_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
struct file *lower_file = NULL;
long rc = -ENOTTY;
if (ecryptfs_file_to_private(file))
lower_file = ecryptfs_file_to_lower(file);
if (lower_file && lower_file->f_op && lower_file->f_op->unlocked_ioctl)
rc = lower_file->f_op->unlocked_ioctl(lower_file, cmd, arg);
return rc;
}
#ifdef CONFIG_COMPAT
static long
ecryptfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
struct file *lower_file = NULL;
long rc = -ENOIOCTLCMD;
if (ecryptfs_file_to_private(file))
lower_file = ecryptfs_file_to_lower(file);
if (lower_file && lower_file->f_op && lower_file->f_op->compat_ioctl)
rc = lower_file->f_op->compat_ioctl(lower_file, cmd, arg);
return rc;
}
#endif
const struct file_operations ecryptfs_dir_fops = {
.readdir = ecryptfs_readdir,
.ioctl = ecryptfs_ioctl,
.unlocked_ioctl = ecryptfs_unlocked_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = ecryptfs_compat_ioctl,
#endif
.open = ecryptfs_open,
.flush = ecryptfs_flush,
.release = ecryptfs_release,
@ -313,7 +341,10 @@ const struct file_operations ecryptfs_main_fops = {
.write = do_sync_write,
.aio_write = generic_file_aio_write,
.readdir = ecryptfs_readdir,
.ioctl = ecryptfs_ioctl,
.unlocked_ioctl = ecryptfs_unlocked_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = ecryptfs_compat_ioctl,
#endif
.mmap = generic_file_mmap,
.open = ecryptfs_open,
.flush = ecryptfs_flush,
@ -322,20 +353,3 @@ const struct file_operations ecryptfs_main_fops = {
.fasync = ecryptfs_fasync,
.splice_read = generic_file_splice_read,
};
static int
ecryptfs_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
unsigned long arg)
{
int rc = 0;
struct file *lower_file = NULL;
if (ecryptfs_file_to_private(file))
lower_file = ecryptfs_file_to_lower(file);
if (lower_file && lower_file->f_op && lower_file->f_op->ioctl)
rc = lower_file->f_op->ioctl(ecryptfs_inode_to_lower(inode),
lower_file, cmd, arg);
else
rc = -ENOTTY;
return rc;
}