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path: root/fs/ecryptfs/inode.c
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Diffstat (limited to 'fs/ecryptfs/inode.c')
-rw-r--r--fs/ecryptfs/inode.c130
1 files changed, 68 insertions, 62 deletions
diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c
index 4a430ab4115..e2d4418affa 100644
--- a/fs/ecryptfs/inode.c
+++ b/fs/ecryptfs/inode.c
@@ -31,6 +31,7 @@
#include <linux/mount.h>
#include <linux/crypto.h>
#include <linux/fs_stack.h>
+#include <linux/slab.h>
#include <asm/unaligned.h>
#include "ecryptfs_kernel.h"
@@ -323,6 +324,7 @@ int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry,
rc = ecryptfs_read_and_validate_header_region(page_virt,
ecryptfs_dentry->d_inode);
if (rc) {
+ memset(page_virt, 0, PAGE_CACHE_SIZE);
rc = ecryptfs_read_and_validate_xattr_region(page_virt,
ecryptfs_dentry);
if (rc) {
@@ -335,7 +337,7 @@ int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry,
ecryptfs_dentry->d_sb)->mount_crypt_stat;
if (mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED) {
if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR)
- file_size = (crypt_stat->num_header_bytes_at_front
+ file_size = (crypt_stat->metadata_size
+ i_size_read(lower_dentry->d_inode));
else
file_size = i_size_read(lower_dentry->d_inode);
@@ -387,9 +389,9 @@ static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
if (IS_ERR(lower_dentry)) {
rc = PTR_ERR(lower_dentry);
- printk(KERN_ERR "%s: lookup_one_len() returned [%d] on "
- "lower_dentry = [%s]\n", __func__, rc,
- ecryptfs_dentry->d_name.name);
+ ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
+ "[%d] on lower_dentry = [%s]\n", __func__, rc,
+ encrypted_and_encoded_name);
goto out_d_drop;
}
if (lower_dentry->d_inode)
@@ -416,9 +418,9 @@ static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
if (IS_ERR(lower_dentry)) {
rc = PTR_ERR(lower_dentry);
- printk(KERN_ERR "%s: lookup_one_len() returned [%d] on "
- "lower_dentry = [%s]\n", __func__, rc,
- encrypted_and_encoded_name);
+ ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
+ "[%d] on lower_dentry = [%s]\n", __func__, rc,
+ encrypted_and_encoded_name);
goto out_d_drop;
}
lookup_and_interpose:
@@ -455,8 +457,8 @@ static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir,
rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb, 0);
if (rc)
goto out_lock;
- fsstack_copy_attr_times(dir, lower_new_dentry->d_inode);
- fsstack_copy_inode_size(dir, lower_new_dentry->d_inode);
+ fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
+ fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
old_dentry->d_inode->i_nlink =
ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink;
i_size_write(new_dentry->d_inode, file_size_save);
@@ -647,38 +649,17 @@ out_lock:
return rc;
}
-static int
-ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz)
+static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf,
+ size_t *bufsiz)
{
+ struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
char *lower_buf;
- size_t lower_bufsiz;
- struct dentry *lower_dentry;
- struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
- char *plaintext_name;
- size_t plaintext_name_size;
+ size_t lower_bufsiz = PATH_MAX;
mm_segment_t old_fs;
int rc;
- lower_dentry = ecryptfs_dentry_to_lower(dentry);
- if (!lower_dentry->d_inode->i_op->readlink) {
- rc = -EINVAL;
- goto out;
- }
- mount_crypt_stat = &ecryptfs_superblock_to_private(
- dentry->d_sb)->mount_crypt_stat;
- /*
- * If the lower filename is encrypted, it will result in a significantly
- * longer name. If needed, truncate the name after decode and decrypt.
- */
- if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)
- lower_bufsiz = PATH_MAX;
- else
- lower_bufsiz = bufsiz;
- /* Released in this function */
lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL);
- if (lower_buf == NULL) {
- printk(KERN_ERR "%s: Out of memory whilst attempting to "
- "kmalloc [%zd] bytes\n", __func__, lower_bufsiz);
+ if (!lower_buf) {
rc = -ENOMEM;
goto out;
}
@@ -688,29 +669,31 @@ ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz)
(char __user *)lower_buf,
lower_bufsiz);
set_fs(old_fs);
- if (rc >= 0) {
- rc = ecryptfs_decode_and_decrypt_filename(&plaintext_name,
- &plaintext_name_size,
- dentry, lower_buf,
- rc);
- if (rc) {
- printk(KERN_ERR "%s: Error attempting to decode and "
- "decrypt filename; rc = [%d]\n", __func__,
- rc);
- goto out_free_lower_buf;
- }
- /* Check for bufsiz <= 0 done in sys_readlinkat() */
- rc = copy_to_user(buf, plaintext_name,
- min((size_t) bufsiz, plaintext_name_size));
- if (rc)
- rc = -EFAULT;
- else
- rc = plaintext_name_size;
- kfree(plaintext_name);
- fsstack_copy_attr_atime(dentry->d_inode, lower_dentry->d_inode);
- }
-out_free_lower_buf:
+ if (rc < 0)
+ goto out;
+ lower_bufsiz = rc;
+ rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry,
+ lower_buf, lower_bufsiz);
+out:
kfree(lower_buf);
+ return rc;
+}
+
+static int
+ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz)
+{
+ char *kbuf;
+ size_t kbufsiz, copied;
+ int rc;
+
+ rc = ecryptfs_readlink_lower(dentry, &kbuf, &kbufsiz);
+ if (rc)
+ goto out;
+ copied = min_t(size_t, bufsiz, kbufsiz);
+ rc = copy_to_user(buf, kbuf, copied) ? -EFAULT : copied;
+ kfree(kbuf);
+ fsstack_copy_attr_atime(dentry->d_inode,
+ ecryptfs_dentry_to_lower(dentry)->d_inode);
out:
return rc;
}
@@ -768,7 +751,7 @@ upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat,
{
loff_t lower_size;
- lower_size = crypt_stat->num_header_bytes_at_front;
+ lower_size = ecryptfs_lower_header_size(crypt_stat);
if (upper_size != 0) {
loff_t num_extents;
@@ -1015,6 +998,28 @@ out:
return rc;
}
+int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry,
+ struct kstat *stat)
+{
+ struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
+ int rc = 0;
+
+ mount_crypt_stat = &ecryptfs_superblock_to_private(
+ dentry->d_sb)->mount_crypt_stat;
+ generic_fillattr(dentry->d_inode, stat);
+ if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) {
+ char *target;
+ size_t targetsiz;
+
+ rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz);
+ if (!rc) {
+ kfree(target);
+ stat->size = targetsiz;
+ }
+ }
+ return rc;
+}
+
int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
struct kstat *stat)
{
@@ -1039,7 +1044,7 @@ ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
lower_dentry = ecryptfs_dentry_to_lower(dentry);
if (!lower_dentry->d_inode->i_op->setxattr) {
- rc = -ENOSYS;
+ rc = -EOPNOTSUPP;
goto out;
}
mutex_lock(&lower_dentry->d_inode->i_mutex);
@@ -1057,7 +1062,7 @@ ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name,
int rc = 0;
if (!lower_dentry->d_inode->i_op->getxattr) {
- rc = -ENOSYS;
+ rc = -EOPNOTSUPP;
goto out;
}
mutex_lock(&lower_dentry->d_inode->i_mutex);
@@ -1084,7 +1089,7 @@ ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size)
lower_dentry = ecryptfs_dentry_to_lower(dentry);
if (!lower_dentry->d_inode->i_op->listxattr) {
- rc = -ENOSYS;
+ rc = -EOPNOTSUPP;
goto out;
}
mutex_lock(&lower_dentry->d_inode->i_mutex);
@@ -1101,7 +1106,7 @@ static int ecryptfs_removexattr(struct dentry *dentry, const char *name)
lower_dentry = ecryptfs_dentry_to_lower(dentry);
if (!lower_dentry->d_inode->i_op->removexattr) {
- rc = -ENOSYS;
+ rc = -EOPNOTSUPP;
goto out;
}
mutex_lock(&lower_dentry->d_inode->i_mutex);
@@ -1132,6 +1137,7 @@ const struct inode_operations ecryptfs_symlink_iops = {
.put_link = ecryptfs_put_link,
.permission = ecryptfs_permission,
.setattr = ecryptfs_setattr,
+ .getattr = ecryptfs_getattr_link,
.setxattr = ecryptfs_setxattr,
.getxattr = ecryptfs_getxattr,
.listxattr = ecryptfs_listxattr,
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-23 12:02:50 +0000