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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 <mhalcrow@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Michael Halcrow 2007-06-27 14:09:44 -07:00 committed by Linus Torvalds
parent 240e2df5c7
commit e10f281bca
1 changed files with 46 additions and 1 deletions
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47
fs/ecryptfs/inode.c
View File

@ -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",