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Tyler Hicks 9c2d205664 eCryptfs: Prevent lower dentry from going negative during unlink ... When calling vfs_unlink() on the lower dentry, d_delete() turns the dentry into a negative dentry when the d_count is 1. This eventually caused a NULL pointer deref when a read() or write() was done and the negative dentry's d_inode was dereferenced in ecryptfs_read_update_atime() or ecryptfs_getxattr(). Placing mutt's tmpdir in an eCryptfs mount is what initially triggered the oops and I was able to reproduce it with the following sequence: open("/tmp/upper/foo", O_RDWR|O_CREAT|O_EXCL|O_NOFOLLOW, 0600) = 3 link("/tmp/upper/foo", "/tmp/upper/bar") = 0 unlink("/tmp/upper/foo") = 0 open("/tmp/upper/bar", O_RDWR|O_CREAT|O_NOFOLLOW, 0600) = 4 unlink("/tmp/upper/bar") = 0 write(4, "eCryptfs test\n"..., 14 <unfinished ...> +++ killed by SIGKILL +++ https://bugs.launchpad.net/ecryptfs/+bug/387073 Reported-by: Loïc Minier <loic.minier@canonical.com> Cc: Serge Hallyn <serue@us.ibm.com> Cc: Dave Kleikamp <shaggy@linux.vnet.ibm.com> Cc: ecryptfs-devel@lists.launchpad.net Cc: stable <stable@kernel.org> Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>		16 years ago
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Kconfig	ecryptfs: improved dependency checking and reporting	16 years ago
Makefile	eCryptfs: remove netlink transport	17 years ago
crypto.c	eCryptfs: Propagate vfs_read and vfs_write return codes	16 years ago
debug.c	…
dentry.c	constify dentry_operations: ecryptfs	16 years ago
ecryptfs_kernel.h	const: mark remaining address_space_operations const	16 years ago
file.c	eCryptfs: Fix data types (int/size_t)	16 years ago
inode.c	eCryptfs: Prevent lower dentry from going negative during unlink	16 years ago
keystore.c	eCryptfs: Validate global auth tok keys	16 years ago
kthread.c	eCryptfs: Check for O_RDONLY lower inodes when opening lower files	16 years ago
main.c	eCryptfs: Check for O_RDONLY lower inodes when opening lower files	16 years ago
messaging.c	eCryptfs: NULL pointer dereference in ecryptfs_send_miscdev()	16 years ago
miscdev.c	eCryptfs: NULL pointer dereference in ecryptfs_send_miscdev()	16 years ago
mmap.c	eCryptfs: Propagate vfs_read and vfs_write return codes	16 years ago
read_write.c	eCryptfs: Propagate vfs_read and vfs_write return codes	16 years ago
super.c	ecryptfs: Remove unneeded locking that triggers lockdep false positives	16 years ago