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fscrypt: make fscrypt_set_test_dummy_encryption() take a 'const char *'

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fscrypt_set_test_dummy_encryption() requires that the optional argument
to the test_dummy_encryption mount option be specified as a substring_t.
That doesn't work well with filesystems that use the new mount API,
since the new way of parsing mount options doesn't use substring_t.

Make it take the argument as a 'const char *' instead.

Instead of moving the match_strdup() into the callers in ext4 and f2fs,
make them just use arg->from directly.  Since the pattern is
"test_dummy_encryption=%s", the argument will be null-terminated.

Acked-by: Jeff Layton <jlayton@kernel.org>
Link: https://lore.kernel.org/r/20200917041136.178600-14-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>
This commit is contained in:
Eric Biggers 2020-09-16 21:11:36 -07:00
parent ac4acb1f4b
commit c8c868abc9
4 changed files with 9 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
fs/crypto/policy.c
View File

@ -697,8 +697,7 @@ EXPORT_SYMBOL_GPL(fscrypt_set_context);
/**
* fscrypt_set_test_dummy_encryption() - handle '-o test_dummy_encryption'
* @sb: the filesystem on which test_dummy_encryption is being specified
* @arg: the argument to the test_dummy_encryption option.
* If no argument was specified, then @arg->from == NULL.
* @arg: the argument to the test_dummy_encryption option. May be NULL.
* @dummy_policy: the filesystem's current dummy policy (input/output, see
* below)
*
@ -712,29 +711,23 @@ EXPORT_SYMBOL_GPL(fscrypt_set_context);
* -EEXIST if a different dummy policy is already set;
* or another -errno value.
*/
int fscrypt_set_test_dummy_encryption(struct super_block *sb,
const substring_t *arg,
int fscrypt_set_test_dummy_encryption(struct super_block *sb, const char *arg,
struct fscrypt_dummy_policy *dummy_policy)
{
const char *argstr = "v2";
const char *argstr_to_free = NULL;
struct fscrypt_key_specifier key_spec = { 0 };
int version;
union fscrypt_policy *policy = NULL;
int err;
if (arg->from) {
argstr = argstr_to_free = match_strdup(arg);
if (!argstr)
return -ENOMEM;
}
if (!arg)
arg = "v2";
if (!strcmp(argstr, "v1")) {
if (!strcmp(arg, "v1")) {
version = FSCRYPT_POLICY_V1;
key_spec.type = FSCRYPT_KEY_SPEC_TYPE_DESCRIPTOR;
memset(key_spec.u.descriptor, 0x42,
FSCRYPT_KEY_DESCRIPTOR_SIZE);
} else if (!strcmp(argstr, "v2")) {
} else if (!strcmp(arg, "v2")) {
version = FSCRYPT_POLICY_V2;
key_spec.type = FSCRYPT_KEY_SPEC_TYPE_IDENTIFIER;
/* key_spec.u.identifier gets filled in when adding the key */
@ -785,7 +778,6 @@ int fscrypt_set_test_dummy_encryption(struct super_block *sb,
err = 0;
out:
kfree(policy);
kfree(argstr_to_free);
return err;
}
EXPORT_SYMBOL_GPL(fscrypt_set_test_dummy_encryption);

2
fs/ext4/super.c
View File

@ -1892,7 +1892,7 @@ static int ext4_set_test_dummy_encryption(struct super_block *sb,
"Can't set test_dummy_encryption on remount");
return -1;
}
err = fscrypt_set_test_dummy_encryption(sb, arg,
err = fscrypt_set_test_dummy_encryption(sb, arg->from,
&sbi->s_dummy_enc_policy);
if (err) {
if (err == -EEXIST)

2
fs/f2fs/super.c
View File

@ -438,7 +438,7 @@ static int f2fs_set_test_dummy_encryption(struct super_block *sb,
return -EINVAL;
}
err = fscrypt_set_test_dummy_encryption(
sb, arg, &F2FS_OPTION(sbi).dummy_enc_policy);
sb, arg->from, &F2FS_OPTION(sbi).dummy_enc_policy);
if (err) {
if (err == -EEXIST)
f2fs_warn(sbi,

5
include/linux/fscrypt.h
View File

@ -15,7 +15,6 @@
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/parser.h>
#include <linux/slab.h>
#include <uapi/linux/fscrypt.h>
@ -153,9 +152,7 @@ struct fscrypt_dummy_policy {
const union fscrypt_policy *policy;
};
int fscrypt_set_test_dummy_encryption(
struct super_block *sb,
const substring_t *arg,
int fscrypt_set_test_dummy_encryption(struct super_block *sb, const char *arg,
struct fscrypt_dummy_policy *dummy_policy);
void fscrypt_show_test_dummy_encryption(struct seq_file *seq, char sep,
struct super_block *sb);