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-rw-r--r--fs/ecryptfs/main.c166
1 files changed, 81 insertions, 85 deletions
diff --git a/fs/ecryptfs/main.c b/fs/ecryptfs/main.c
index 760983d0f25e..cbd4e18adb20 100644
--- a/fs/ecryptfs/main.c
+++ b/fs/ecryptfs/main.c
@@ -281,7 +281,7 @@ static void ecryptfs_init_mount_crypt_stat(
*
* Returns zero on success; non-zero on error
*/
-static int ecryptfs_parse_options(struct super_block *sb, char *options)
+static int ecryptfs_parse_options(struct ecryptfs_sb_info *sbi, char *options)
{
char *p;
int rc = 0;
@@ -293,7 +293,7 @@ static int ecryptfs_parse_options(struct super_block *sb, char *options)
int fn_cipher_key_bytes;
int fn_cipher_key_bytes_set = 0;
struct ecryptfs_mount_crypt_stat *mount_crypt_stat =
- &ecryptfs_superblock_to_private(sb)->mount_crypt_stat;
+ &sbi->mount_crypt_stat;
substring_t args[MAX_OPT_ARGS];
int token;
char *sig_src;
@@ -483,68 +483,7 @@ out:
}
struct kmem_cache *ecryptfs_sb_info_cache;
-
-/**
- * ecryptfs_fill_super
- * @sb: The ecryptfs super block
- * @raw_data: The options passed to mount
- * @silent: Not used but required by function prototype
- *
- * Sets up what we can of the sb, rest is done in ecryptfs_read_super
- *
- * Returns zero on success; non-zero otherwise
- */
-static int
-ecryptfs_fill_super(struct super_block *sb, void *raw_data, int silent)
-{
- struct ecryptfs_sb_info *esi;
- int rc = 0;
-
- /* Released in ecryptfs_put_super() */
- ecryptfs_set_superblock_private(sb,
- kmem_cache_zalloc(ecryptfs_sb_info_cache,
- GFP_KERNEL));
- esi = ecryptfs_superblock_to_private(sb);
- if (!esi) {
- ecryptfs_printk(KERN_WARNING, "Out of memory\n");
- rc = -ENOMEM;
- goto out;
- }
-
- rc = bdi_setup_and_register(&esi->bdi, "ecryptfs", BDI_CAP_MAP_COPY);
- if (rc)
- goto out;
-
- sb->s_bdi = &esi->bdi;
- sb->s_op = &ecryptfs_sops;
- /* Released through deactivate_super(sb) from get_sb_nodev */
- sb->s_root = d_alloc(NULL, &(const struct qstr) {
- .hash = 0,.name = "/",.len = 1});
- if (!sb->s_root) {
- ecryptfs_printk(KERN_ERR, "d_alloc failed\n");
- rc = -ENOMEM;
- goto out;
- }
- sb->s_root->d_op = &ecryptfs_dops;
- sb->s_root->d_sb = sb;
- sb->s_root->d_parent = sb->s_root;
- /* Released in d_release when dput(sb->s_root) is called */
- /* through deactivate_super(sb) from get_sb_nodev() */
- ecryptfs_set_dentry_private(sb->s_root,
- kmem_cache_zalloc(ecryptfs_dentry_info_cache,
- GFP_KERNEL));
- if (!ecryptfs_dentry_to_private(sb->s_root)) {
- ecryptfs_printk(KERN_ERR,
- "dentry_info_cache alloc failed\n");
- rc = -ENOMEM;
- goto out;
- }
- rc = 0;
-out:
- /* Should be able to rely on deactivate_super called from
- * get_sb_nodev */
- return rc;
-}
+static struct file_system_type ecryptfs_fs_type;
/**
* ecryptfs_read_super
@@ -565,6 +504,13 @@ static int ecryptfs_read_super(struct super_block *sb, const char *dev_name)
ecryptfs_printk(KERN_WARNING, "path_lookup() failed\n");
goto out;
}
+ if (path.dentry->d_sb->s_type == &ecryptfs_fs_type) {
+ rc = -EINVAL;
+ printk(KERN_ERR "Mount on filesystem of type "
+ "eCryptfs explicitly disallowed due to "
+ "known incompatibilities\n");
+ goto out_free;
+ }
ecryptfs_set_superblock_lower(sb, path.dentry->d_sb);
sb->s_maxbytes = path.dentry->d_sb->s_maxbytes;
sb->s_blocksize = path.dentry->d_sb->s_blocksize;
@@ -588,11 +534,8 @@ out:
* @dev_name: The path to mount over
* @raw_data: The options passed into the kernel
*
- * The whole ecryptfs_get_sb process is broken into 4 functions:
+ * The whole ecryptfs_get_sb process is broken into 3 functions:
* ecryptfs_parse_options(): handle options passed to ecryptfs, if any
- * ecryptfs_fill_super(): used by get_sb_nodev, fills out the super_block
- * with as much information as it can before needing
- * the lower filesystem.
* ecryptfs_read_super(): this accesses the lower filesystem and uses
* ecryptfs_interpose to perform most of the linking
* ecryptfs_interpose(): links the lower filesystem into ecryptfs (inode.c)
@@ -601,30 +544,78 @@ static int ecryptfs_get_sb(struct file_system_type *fs_type, int flags,
const char *dev_name, void *raw_data,
struct vfsmount *mnt)
{
+ struct super_block *s;
+ struct ecryptfs_sb_info *sbi;
+ struct ecryptfs_dentry_info *root_info;
+ const char *err = "Getting sb failed";
int rc;
- struct super_block *sb;
- rc = get_sb_nodev(fs_type, flags, raw_data, ecryptfs_fill_super, mnt);
- if (rc < 0) {
- printk(KERN_ERR "Getting sb failed; rc = [%d]\n", rc);
+ sbi = kmem_cache_zalloc(ecryptfs_sb_info_cache, GFP_KERNEL);
+ if (!sbi) {
+ rc = -ENOMEM;
goto out;
}
- sb = mnt->mnt_sb;
- rc = ecryptfs_parse_options(sb, raw_data);
+
+ rc = ecryptfs_parse_options(sbi, raw_data);
if (rc) {
- printk(KERN_ERR "Error parsing options; rc = [%d]\n", rc);
- goto out_abort;
+ err = "Error parsing options";
+ goto out;
+ }
+
+ s = sget(fs_type, NULL, set_anon_super, NULL);
+ if (IS_ERR(s)) {
+ rc = PTR_ERR(s);
+ goto out;
}
- rc = ecryptfs_read_super(sb, dev_name);
+
+ s->s_flags = flags;
+ rc = bdi_setup_and_register(&sbi->bdi, "ecryptfs", BDI_CAP_MAP_COPY);
if (rc) {
- printk(KERN_ERR "Reading sb failed; rc = [%d]\n", rc);
- goto out_abort;
+ deactivate_locked_super(s);
+ goto out;
}
- goto out;
-out_abort:
- dput(sb->s_root); /* aka mnt->mnt_root, as set by get_sb_nodev() */
- deactivate_locked_super(sb);
+
+ ecryptfs_set_superblock_private(s, sbi);
+ s->s_bdi = &sbi->bdi;
+
+ /* ->kill_sb() will take care of sbi after that point */
+ sbi = NULL;
+ s->s_op = &ecryptfs_sops;
+
+ rc = -ENOMEM;
+ s->s_root = d_alloc(NULL, &(const struct qstr) {
+ .hash = 0,.name = "/",.len = 1});
+ if (!s->s_root) {
+ deactivate_locked_super(s);
+ goto out;
+ }
+ s->s_root->d_op = &ecryptfs_dops;
+ s->s_root->d_sb = s;
+ s->s_root->d_parent = s->s_root;
+
+ root_info = kmem_cache_zalloc(ecryptfs_dentry_info_cache, GFP_KERNEL);
+ if (!root_info) {
+ deactivate_locked_super(s);
+ goto out;
+ }
+ /* ->kill_sb() will take care of root_info */
+ ecryptfs_set_dentry_private(s->s_root, root_info);
+ s->s_flags |= MS_ACTIVE;
+ rc = ecryptfs_read_super(s, dev_name);
+ if (rc) {
+ deactivate_locked_super(s);
+ err = "Reading sb failed";
+ goto out;
+ }
+ simple_set_mnt(mnt, s);
+ return 0;
+
out:
+ if (sbi) {
+ ecryptfs_destroy_mount_crypt_stat(&sbi->mount_crypt_stat);
+ kmem_cache_free(ecryptfs_sb_info_cache, sbi);
+ }
+ printk(KERN_ERR "%s; rc = [%d]\n", err, rc);
return rc;
}
@@ -633,11 +624,16 @@ out:
* @sb: The ecryptfs super block
*
* Used to bring the superblock down and free the private data.
- * Private data is free'd in ecryptfs_put_super()
*/
static void ecryptfs_kill_block_super(struct super_block *sb)
{
- generic_shutdown_super(sb);
+ struct ecryptfs_sb_info *sb_info = ecryptfs_superblock_to_private(sb);
+ kill_anon_super(sb);
+ if (!sb_info)
+ return;
+ ecryptfs_destroy_mount_crypt_stat(&sb_info->mount_crypt_stat);
+ bdi_destroy(&sb_info->bdi);
+ kmem_cache_free(ecryptfs_sb_info_cache, sb_info);
}
static struct file_system_type ecryptfs_fs_type = {
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-21 11:49:41 +0100