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authorLinus Torvalds <torvalds@linux-foundation.org>2018-02-04 19:43:12 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2018-02-04 19:43:12 +0100
commit3462ac57033e79a87dbae2497773f22b9c536fbc (patch)
tree08d0b98ac665ad0cd0e85bde0342fd2650424db5 /fs/ext4
parentMerge tag 'usercopy-v4.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/g... (diff)
parentfscrypt: fix build with pre-4.6 gcc versions (diff)
downloadlinux-3462ac57033e79a87dbae2497773f22b9c536fbc.tar.xz
linux-3462ac57033e79a87dbae2497773f22b9c536fbc.zip
Merge tag 'fscrypt_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/fscrypt
Pull fscrypt updates from Ted Ts'o: "Refactor support for encrypted symlinks to move common code to fscrypt" Ted also points out about the merge: "This makes the f2fs symlink code use the fscrypt_encrypt_symlink() from the fscrypt tree. This will end up dropping the kzalloc() -> f2fs_kzalloc() change, which means the fscrypt-specific allocation won't get tested by f2fs's kmalloc error injection system; which is fine" * tag 'fscrypt_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/fscrypt: (26 commits) fscrypt: fix build with pre-4.6 gcc versions fscrypt: remove 'ci' parameter from fscrypt_put_encryption_info() fscrypt: document symlink length restriction fscrypt: fix up fscrypt_fname_encrypted_size() for internal use fscrypt: define fscrypt_fname_alloc_buffer() to be for presented names fscrypt: calculate NUL-padding length in one place only fscrypt: move fscrypt_symlink_data to fscrypt_private.h fscrypt: remove fscrypt_fname_usr_to_disk() ubifs: switch to fscrypt_get_symlink() ubifs: switch to fscrypt ->symlink() helper functions ubifs: free the encrypted symlink target f2fs: switch to fscrypt_get_symlink() f2fs: switch to fscrypt ->symlink() helper functions ext4: switch to fscrypt_get_symlink() ext4: switch to fscrypt ->symlink() helper functions fscrypt: new helper function - fscrypt_get_symlink() fscrypt: new helper functions for ->symlink() fscrypt: trim down fscrypt.h includes fscrypt: move fscrypt_is_dot_dotdot() to fs/crypto/fname.c fscrypt: move fscrypt_valid_enc_modes() to fscrypt_private.h ...
Diffstat (limited to 'fs/ext4')
-rw-r--r--fs/ext4/namei.c58
-rw-r--r--fs/ext4/super.c4
-rw-r--r--fs/ext4/symlink.c43
3 files changed, 22 insertions, 83 deletions
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 9aa1deb1a525..b1f21e3a0763 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -3057,39 +3057,19 @@ static int ext4_symlink(struct inode *dir,
struct inode *inode;
int err, len = strlen(symname);
int credits;
- bool encryption_required;
struct fscrypt_str disk_link;
- struct fscrypt_symlink_data *sd = NULL;
if (unlikely(ext4_forced_shutdown(EXT4_SB(dir->i_sb))))
return -EIO;
- disk_link.len = len + 1;
- disk_link.name = (char *) symname;
-
- encryption_required = (ext4_encrypted_inode(dir) ||
- DUMMY_ENCRYPTION_ENABLED(EXT4_SB(dir->i_sb)));
- if (encryption_required) {
- err = fscrypt_get_encryption_info(dir);
- if (err)
- return err;
- if (!fscrypt_has_encryption_key(dir))
- return -ENOKEY;
- disk_link.len = (fscrypt_fname_encrypted_size(dir, len) +
- sizeof(struct fscrypt_symlink_data));
- sd = kzalloc(disk_link.len, GFP_KERNEL);
- if (!sd)
- return -ENOMEM;
- }
-
- if (disk_link.len > dir->i_sb->s_blocksize) {
- err = -ENAMETOOLONG;
- goto err_free_sd;
- }
+ err = fscrypt_prepare_symlink(dir, symname, len, dir->i_sb->s_blocksize,
+ &disk_link);
+ if (err)
+ return err;
err = dquot_initialize(dir);
if (err)
- goto err_free_sd;
+ return err;
if ((disk_link.len > EXT4_N_BLOCKS * 4)) {
/*
@@ -3118,27 +3098,18 @@ static int ext4_symlink(struct inode *dir,
if (IS_ERR(inode)) {
if (handle)
ext4_journal_stop(handle);
- err = PTR_ERR(inode);
- goto err_free_sd;
+ return PTR_ERR(inode);
}
- if (encryption_required) {
- struct qstr istr;
- struct fscrypt_str ostr =
- FSTR_INIT(sd->encrypted_path, disk_link.len);
-
- istr.name = (const unsigned char *) symname;
- istr.len = len;
- err = fscrypt_fname_usr_to_disk(inode, &istr, &ostr);
+ if (IS_ENCRYPTED(inode)) {
+ err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link);
if (err)
goto err_drop_inode;
- sd->len = cpu_to_le16(ostr.len);
- disk_link.name = (char *) sd;
inode->i_op = &ext4_encrypted_symlink_inode_operations;
}
if ((disk_link.len > EXT4_N_BLOCKS * 4)) {
- if (!encryption_required)
+ if (!IS_ENCRYPTED(inode))
inode->i_op = &ext4_symlink_inode_operations;
inode_nohighmem(inode);
ext4_set_aops(inode);
@@ -3180,7 +3151,7 @@ static int ext4_symlink(struct inode *dir,
} else {
/* clear the extent format for fast symlink */
ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
- if (!encryption_required) {
+ if (!IS_ENCRYPTED(inode)) {
inode->i_op = &ext4_fast_symlink_inode_operations;
inode->i_link = (char *)&EXT4_I(inode)->i_data;
}
@@ -3195,16 +3166,17 @@ static int ext4_symlink(struct inode *dir,
if (handle)
ext4_journal_stop(handle);
- kfree(sd);
- return err;
+ goto out_free_encrypted_link;
+
err_drop_inode:
if (handle)
ext4_journal_stop(handle);
clear_nlink(inode);
unlock_new_inode(inode);
iput(inode);
-err_free_sd:
- kfree(sd);
+out_free_encrypted_link:
+ if (disk_link.name != (unsigned char *)symname)
+ kfree(disk_link.name);
return err;
}
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 899e6faf3381..421222ec3509 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1073,9 +1073,7 @@ void ext4_clear_inode(struct inode *inode)
jbd2_free_inode(EXT4_I(inode)->jinode);
EXT4_I(inode)->jinode = NULL;
}
-#ifdef CONFIG_EXT4_FS_ENCRYPTION
- fscrypt_put_encryption_info(inode, NULL);
-#endif
+ fscrypt_put_encryption_info(inode);
}
static struct inode *ext4_nfs_get_inode(struct super_block *sb,
diff --git a/fs/ext4/symlink.c b/fs/ext4/symlink.c
index a2006c9af1d9..dd05af983092 100644
--- a/fs/ext4/symlink.c
+++ b/fs/ext4/symlink.c
@@ -28,59 +28,28 @@ static const char *ext4_encrypted_get_link(struct dentry *dentry,
struct delayed_call *done)
{
struct page *cpage = NULL;
- char *caddr, *paddr = NULL;
- struct fscrypt_str cstr, pstr;
- struct fscrypt_symlink_data *sd;
- int res;
- u32 max_size = inode->i_sb->s_blocksize;
+ const void *caddr;
+ unsigned int max_size;
+ const char *paddr;
if (!dentry)
return ERR_PTR(-ECHILD);
- res = fscrypt_get_encryption_info(inode);
- if (res)
- return ERR_PTR(res);
-
if (ext4_inode_is_fast_symlink(inode)) {
- caddr = (char *) EXT4_I(inode)->i_data;
+ caddr = EXT4_I(inode)->i_data;
max_size = sizeof(EXT4_I(inode)->i_data);
} else {
cpage = read_mapping_page(inode->i_mapping, 0, NULL);
if (IS_ERR(cpage))
return ERR_CAST(cpage);
caddr = page_address(cpage);
+ max_size = inode->i_sb->s_blocksize;
}
- /* Symlink is encrypted */
- sd = (struct fscrypt_symlink_data *)caddr;
- cstr.name = sd->encrypted_path;
- cstr.len = le16_to_cpu(sd->len);
- if ((cstr.len + sizeof(struct fscrypt_symlink_data) - 1) > max_size) {
- /* Symlink data on the disk is corrupted */
- res = -EFSCORRUPTED;
- goto errout;
- }
-
- res = fscrypt_fname_alloc_buffer(inode, cstr.len, &pstr);
- if (res)
- goto errout;
- paddr = pstr.name;
-
- res = fscrypt_fname_disk_to_usr(inode, 0, 0, &cstr, &pstr);
- if (res)
- goto errout;
-
- /* Null-terminate the name */
- paddr[pstr.len] = '\0';
+ paddr = fscrypt_get_symlink(inode, caddr, max_size, done);
if (cpage)
put_page(cpage);
- set_delayed_call(done, kfree_link, paddr);
return paddr;
-errout:
- if (cpage)
- put_page(cpage);
- kfree(paddr);
- return ERR_PTR(res);
}
const struct inode_operations ext4_encrypted_symlink_inode_operations = {