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f2fs crypto: handle unexpected lack of encryption keys 

This patch syncs f2fs with commit abdd438b26 ("ext4 crypto: handle
unexpected lack of encryption keys") from ext4.

Fix up attempts by users to try to write to a file when they don't
have access to the encryption key.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2016-02-14 18:58:35 +08:00 committed by Jaegeuk Kim
parent ed3360abbc
commit ae10866864
2 changed files with 7 additions and 2 deletions
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3
fs/f2fs/crypto_policy.c
View File

@ -192,7 +192,8 @@ int f2fs_inherit_context(struct inode *parent, struct inode *child,
return res;
ci = F2FS_I(parent)->i_crypt_info;
BUG_ON(ci == NULL);
if (ci == NULL)
return -ENOKEY;
ctx.format = F2FS_ENCRYPTION_CONTEXT_FORMAT_V1;

6
fs/f2fs/file.c
View File

@ -424,6 +424,8 @@ static int f2fs_file_mmap(struct file *file, struct vm_area_struct *vma)
err = f2fs_get_encryption_info(inode);
if (err)
return 0;
if (!f2fs_encrypted_inode(inode))
return -ENOKEY;
}
/* we don't need to use inline_data strictly */
@ -443,7 +445,9 @@ static int f2fs_file_open(struct inode *inode, struct file *filp)
if (!ret && f2fs_encrypted_inode(inode)) {
ret = f2fs_get_encryption_info(inode);
if (ret)
ret = -EACCES;
return -EACCES;
if (!f2fs_encrypted_inode(inode))
return -ENOKEY;
}
return ret;
}