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authorTheodore Ts'o <tytso@mit.edu>2015-05-31 20:35:39 +0300
committerTheodore Ts'o <tytso@mit.edu>2015-05-31 20:35:39 +0300
commitabdd438b26b409eaccf9c847fcf9c3ab52f1959e (patch)
tree4473a3667ab265065f0ce81b49d76e8c095b19d2 /fs
parent4d3c4e5b8cae3bb45ba933a22670504239958aa1 (diff)
downloadlinux-abdd438b26b409eaccf9c847fcf9c3ab52f1959e.tar.xz
ext4 crypto: handle unexpected lack of encryption keys
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>
Diffstat (limited to 'fs')
-rw-r--r--fs/ext4/crypto.c3
-rw-r--r--fs/ext4/crypto_policy.c3
-rw-r--r--fs/ext4/file.c17
3 files changed, 14 insertions, 9 deletions
diff --git a/fs/ext4/crypto.c b/fs/ext4/crypto.c
index 1c9a8c499369..efcb7c04d172 100644
--- a/fs/ext4/crypto.c
+++ b/fs/ext4/crypto.c
@@ -104,7 +104,8 @@ struct ext4_crypto_ctx *ext4_get_crypto_ctx(struct inode *inode)
unsigned long flags;
struct ext4_crypt_info *ci = EXT4_I(inode)->i_crypt_info;
- BUG_ON(ci == NULL);
+ if (ci == NULL)
+ return ERR_PTR(-ENOKEY);
/*
* We first try getting the ctx from a free list because in
diff --git a/fs/ext4/crypto_policy.c b/fs/ext4/crypto_policy.c
index a1d434d0dea8..02c4e5df7afb 100644
--- a/fs/ext4/crypto_policy.c
+++ b/fs/ext4/crypto_policy.c
@@ -183,7 +183,8 @@ int ext4_inherit_context(struct inode *parent, struct inode *child)
if (res < 0)
return res;
ci = EXT4_I(parent)->i_crypt_info;
- BUG_ON(ci == NULL);
+ if (ci == NULL)
+ return -ENOKEY;
ctx.format = EXT4_ENCRYPTION_CONTEXT_FORMAT_V1;
if (DUMMY_ENCRYPTION_ENABLED(EXT4_SB(parent->i_sb))) {
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 875ca6b95a4b..ac517f15741c 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -226,6 +226,8 @@ static int ext4_file_mmap(struct file *file, struct vm_area_struct *vma)
int err = ext4_get_encryption_info(inode);
if (err)
return 0;
+ if (ext4_encryption_info(inode) == NULL)
+ return -ENOKEY;
}
file_accessed(file);
if (IS_DAX(file_inode(file))) {
@@ -278,6 +280,13 @@ static int ext4_file_open(struct inode * inode, struct file * filp)
ext4_journal_stop(handle);
}
}
+ if (ext4_encrypted_inode(inode)) {
+ ret = ext4_get_encryption_info(inode);
+ if (ret)
+ return -EACCES;
+ if (ext4_encryption_info(inode) == NULL)
+ return -ENOKEY;
+ }
/*
* Set up the jbd2_inode if we are opening the inode for
* writing and the journal is present
@@ -287,13 +296,7 @@ static int ext4_file_open(struct inode * inode, struct file * filp)
if (ret < 0)
return ret;
}
- ret = dquot_file_open(inode, filp);
- if (!ret && ext4_encrypted_inode(inode)) {
- ret = ext4_get_encryption_info(inode);
- if (ret)
- ret = -EACCES;
- }
- return ret;
+ return dquot_file_open(inode, filp);
}
/*