linux/fs/ecryptfs
Tyler Hicks 8dc6780587 eCryptfs: Gracefully refuse miscdev file ops on inherited/passed files
File operations on /dev/ecryptfs would BUG() when the operations were
performed by processes other than the process that originally opened the
file. This could happen with open files inherited after fork() or file
descriptors passed through IPC mechanisms. Rather than calling BUG(), an
error code can be safely returned in most situations.

In ecryptfs_miscdev_release(), eCryptfs still needs to handle the
release even if the last file reference is being held by a process that
didn't originally open the file. ecryptfs_find_daemon_by_euid() will not
be successful, so a pointer to the daemon is stored in the file's
private_data. The private_data pointer is initialized when the miscdev
file is opened and only used when the file is released.

https://launchpad.net/bugs/994247

Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
Reported-by: Sasha Levin <levinsasha928@gmail.com>
Tested-by: Sasha Levin <levinsasha928@gmail.com>
2012-07-06 15:51:12 -05:00
..
Kconfig eCryptfs: fix compile error 2011-08-09 13:42:46 -05:00
Makefile eCryptfs: remove netlink transport 2008-10-16 11:21:39 -07:00
crypto.c eCryptfs: Improve statfs reporting 2012-02-16 16:06:21 -06:00
debug.c eCryptfs: update comment and debug statement 2007-10-16 09:43:11 -07:00
dentry.c eCryptfs: Handle NULL nameidata pointers 2011-02-21 14:45:57 -06:00
ecryptfs_kernel.h eCryptfs: Improve statfs reporting 2012-02-16 16:06:21 -06:00
file.c switch touch_atime to struct path 2012-03-20 21:29:41 -04:00
inode.c get rid of pointless allocations and copying in ecryptfs_follow_link() 2012-05-29 23:28:40 -04:00
keystore.c eCryptfs: Improve statfs reporting 2012-02-16 16:06:21 -06:00
kthread.c eCryptfs: Properly check for O_RDONLY flag before doing privileged open 2012-07-03 16:34:09 -07:00
main.c ecryptfs: make register_filesystem() the last potential failure exit 2012-03-20 21:29:49 -04:00
messaging.c userns: Use cred->user_ns instead of cred->user->user_ns 2012-04-07 16:55:51 -07:00
miscdev.c eCryptfs: Gracefully refuse miscdev file ops on inherited/passed files 2012-07-06 15:51:12 -05:00
mmap.c ecryptfs: remove the second argument of k[un]map_atomic() 2012-02-16 16:06:27 -06:00
read_write.c ecryptfs: remove the second argument of k[un]map_atomic() 2012-02-16 16:06:27 -06:00
super.c vfs: Rename end_writeback() to clear_inode() 2012-05-06 13:43:41 +08:00