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authorEric Biggers <ebiggers@google.com>2017-01-05 13:51:18 -0800
committerTheodore Ts'o <tytso@mit.edu>2017-01-08 01:03:41 -0500
commita5d431eff2e0bb22156897435aa277ddc96074f7 (patch)
tree21fc94db3331336db3fd7bce15820907d6da5261 /fs/crypto
parentf099d616dd689d27b08dec95d0b6f1f302cf8ec4 (diff)
downloadlinux-a5d431eff2e0bb22156897435aa277ddc96074f7.tar.bz2
fscrypt: make fscrypt_operations.key_prefix a string
There was an unnecessary amount of complexity around requesting the filesystem-specific key prefix. It was unclear why; perhaps it was envisioned that different instances of the same filesystem type could use different key prefixes, or that key prefixes could be binary. However, neither of those things were implemented or really make sense at all. So simplify the code by making key_prefix a const char *. Signed-off-by: Eric Biggers <ebiggers@google.com> Reviewed-by: Richard Weinberger <richard@nod.at> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/crypto')
-rw-r--r--fs/crypto/keyinfo.c31
1 files changed, 11 insertions, 20 deletions
diff --git a/fs/crypto/keyinfo.c b/fs/crypto/keyinfo.c
index 80f145c8d550..eeb6fd67ea17 100644
--- a/fs/crypto/keyinfo.c
+++ b/fs/crypto/keyinfo.c
@@ -77,26 +77,22 @@ out:
static int validate_user_key(struct fscrypt_info *crypt_info,
struct fscrypt_context *ctx, u8 *raw_key,
- u8 *prefix, int prefix_size)
+ const char *prefix)
{
- u8 *full_key_descriptor;
+ char *description;
struct key *keyring_key;
struct fscrypt_key *master_key;
const struct user_key_payload *ukp;
- int full_key_len = prefix_size + (FS_KEY_DESCRIPTOR_SIZE * 2) + 1;
int res;
- full_key_descriptor = kmalloc(full_key_len, GFP_NOFS);
- if (!full_key_descriptor)
+ description = kasprintf(GFP_NOFS, "%s%*phN", prefix,
+ FS_KEY_DESCRIPTOR_SIZE,
+ ctx->master_key_descriptor);
+ if (!description)
return -ENOMEM;
- memcpy(full_key_descriptor, prefix, prefix_size);
- sprintf(full_key_descriptor + prefix_size,
- "%*phN", FS_KEY_DESCRIPTOR_SIZE,
- ctx->master_key_descriptor);
- full_key_descriptor[full_key_len - 1] = '\0';
- keyring_key = request_key(&key_type_logon, full_key_descriptor, NULL);
- kfree(full_key_descriptor);
+ keyring_key = request_key(&key_type_logon, description, NULL);
+ kfree(description);
if (IS_ERR(keyring_key))
return PTR_ERR(keyring_key);
@@ -251,15 +247,10 @@ retry:
if (!raw_key)
goto out;
- res = validate_user_key(crypt_info, &ctx, raw_key,
- FS_KEY_DESC_PREFIX, FS_KEY_DESC_PREFIX_SIZE);
+ res = validate_user_key(crypt_info, &ctx, raw_key, FS_KEY_DESC_PREFIX);
if (res && inode->i_sb->s_cop->key_prefix) {
- u8 *prefix = NULL;
- int prefix_size, res2;
-
- prefix_size = inode->i_sb->s_cop->key_prefix(inode, &prefix);
- res2 = validate_user_key(crypt_info, &ctx, raw_key,
- prefix, prefix_size);
+ int res2 = validate_user_key(crypt_info, &ctx, raw_key,
+ inode->i_sb->s_cop->key_prefix);
if (res2) {
if (res2 == -ENOKEY)
res = -ENOKEY;