From e10f281bca03f45bdec91e67645c394eaec2f8f6 Mon Sep 17 00:00:00 2001 From: Michael Halcrow Date: Wed, 27 Jun 2007 14:09:44 -0700 Subject: [PATCH] eCryptfs: initialize crypt_stat in setattr Recent changes in eCryptfs have made it possible to get to ecryptfs_setattr() with an uninitialized crypt_stat struct. This results in a wide and colorful variety of unpleasantries. This patch properly initializes the crypt_stat structure in ecryptfs_setattr() when it is necessary to do so. Signed-off-by: Michael Halcrow Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/ecryptfs/inode.c | 47 ++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 46 insertions(+), 1 deletion(-) diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c index 0981ae35ea16..83e94fedd4e9 100644 --- a/fs/ecryptfs/inode.c +++ b/fs/ecryptfs/inode.c @@ -894,9 +894,54 @@ static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) struct ecryptfs_crypt_stat *crypt_stat; crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; - lower_dentry = ecryptfs_dentry_to_lower(dentry); + if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) + ecryptfs_init_crypt_stat(crypt_stat); inode = dentry->d_inode; lower_inode = ecryptfs_inode_to_lower(inode); + lower_dentry = ecryptfs_dentry_to_lower(dentry); + mutex_lock(&crypt_stat->cs_mutex); + if (S_ISDIR(dentry->d_inode->i_mode)) + crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); + else if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) + || !(crypt_stat->flags & ECRYPTFS_KEY_VALID)) { + struct vfsmount *lower_mnt; + struct file *lower_file = NULL; + struct ecryptfs_mount_crypt_stat *mount_crypt_stat; + int lower_flags; + + lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry); + lower_flags = O_RDONLY; + if ((rc = ecryptfs_open_lower_file(&lower_file, lower_dentry, + lower_mnt, lower_flags))) { + printk(KERN_ERR + "Error opening lower file; rc = [%d]\n", rc); + mutex_unlock(&crypt_stat->cs_mutex); + goto out; + } + mount_crypt_stat = &ecryptfs_superblock_to_private( + dentry->d_sb)->mount_crypt_stat; + if ((rc = ecryptfs_read_metadata(dentry, lower_file))) { + if (!(mount_crypt_stat->flags + & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { + rc = -EIO; + printk(KERN_WARNING "Attempt to read file that " + "is not in a valid eCryptfs format, " + "and plaintext passthrough mode is not " + "enabled; returning -EIO\n"); + + mutex_unlock(&crypt_stat->cs_mutex); + fput(lower_file); + goto out; + } + rc = 0; + crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); + mutex_unlock(&crypt_stat->cs_mutex); + fput(lower_file); + goto out; + } + fput(lower_file); + } + mutex_unlock(&crypt_stat->cs_mutex); if (ia->ia_valid & ATTR_SIZE) { ecryptfs_printk(KERN_DEBUG, "ia->ia_valid = [0x%x] ATTR_SIZE" " = [0x%x]\n", -- 2.20.1