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author | Tyler Hicks <tyhicks@linux.vnet.ibm.com> | 2009-11-03 11:45:11 -0600 |
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committer | Tyler Hicks <tyhicks@linux.vnet.ibm.com> | 2010-08-09 10:33:04 -0500 |
commit | c43f7b8fb03be8bcc579bfc4e6ab70eac887ab55 (patch) | |
tree | ec4f169d9260b78ef93e39c554fc32532b399b18 | |
parent | a1275c3b21e433888994f7b979cd1129d384ec9c (diff) | |
download | linux-3.10-c43f7b8fb03be8bcc579bfc4e6ab70eac887ab55.tar.gz linux-3.10-c43f7b8fb03be8bcc579bfc4e6ab70eac887ab55.tar.bz2 linux-3.10-c43f7b8fb03be8bcc579bfc4e6ab70eac887ab55.zip |
eCryptfs: Handle ioctl calls with unlocked and compat functions
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>
-rw-r--r-- | fs/ecryptfs/file.c | 56 |
1 files changed, 35 insertions, 21 deletions
diff --git a/fs/ecryptfs/file.c b/fs/ecryptfs/file.c index e8fcf4e2ed7..6e4f84cf73e 100644 --- a/fs/ecryptfs/file.c +++ b/fs/ecryptfs/file.c @@ -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; -} |