mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-13 08:46:45 +07:00
6eb61d587f
This allows us to have more context in ubifs_assert() and take different actions depending on the configuration. Signed-off-by: Richard Weinberger <richard@nod.at>
86 lines
2.3 KiB
C
86 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include "ubifs.h"
|
|
|
|
static int ubifs_crypt_get_context(struct inode *inode, void *ctx, size_t len)
|
|
{
|
|
return ubifs_xattr_get(inode, UBIFS_XATTR_NAME_ENCRYPTION_CONTEXT,
|
|
ctx, len);
|
|
}
|
|
|
|
static int ubifs_crypt_set_context(struct inode *inode, const void *ctx,
|
|
size_t len, void *fs_data)
|
|
{
|
|
/*
|
|
* Creating an encryption context is done unlocked since we
|
|
* operate on a new inode which is not visible to other users
|
|
* at this point. So, no need to check whether inode is locked.
|
|
*/
|
|
return ubifs_xattr_set(inode, UBIFS_XATTR_NAME_ENCRYPTION_CONTEXT,
|
|
ctx, len, 0, false);
|
|
}
|
|
|
|
static bool ubifs_crypt_empty_dir(struct inode *inode)
|
|
{
|
|
return ubifs_check_dir_empty(inode) == 0;
|
|
}
|
|
|
|
int ubifs_encrypt(const struct inode *inode, struct ubifs_data_node *dn,
|
|
unsigned int in_len, unsigned int *out_len, int block)
|
|
{
|
|
struct ubifs_info *c = inode->i_sb->s_fs_info;
|
|
void *p = &dn->data;
|
|
struct page *ret;
|
|
unsigned int pad_len = round_up(in_len, UBIFS_CIPHER_BLOCK_SIZE);
|
|
|
|
ubifs_assert(c, pad_len <= *out_len);
|
|
dn->compr_size = cpu_to_le16(in_len);
|
|
|
|
/* pad to full block cipher length */
|
|
if (pad_len != in_len)
|
|
memset(p + in_len, 0, pad_len - in_len);
|
|
|
|
ret = fscrypt_encrypt_page(inode, virt_to_page(&dn->data), pad_len,
|
|
offset_in_page(&dn->data), block, GFP_NOFS);
|
|
if (IS_ERR(ret)) {
|
|
ubifs_err(c, "fscrypt_encrypt_page failed: %ld", PTR_ERR(ret));
|
|
return PTR_ERR(ret);
|
|
}
|
|
*out_len = pad_len;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int ubifs_decrypt(const struct inode *inode, struct ubifs_data_node *dn,
|
|
unsigned int *out_len, int block)
|
|
{
|
|
struct ubifs_info *c = inode->i_sb->s_fs_info;
|
|
int err;
|
|
unsigned int clen = le16_to_cpu(dn->compr_size);
|
|
unsigned int dlen = *out_len;
|
|
|
|
if (clen <= 0 || clen > UBIFS_BLOCK_SIZE || clen > dlen) {
|
|
ubifs_err(c, "bad compr_size: %i", clen);
|
|
return -EINVAL;
|
|
}
|
|
|
|
ubifs_assert(c, dlen <= UBIFS_BLOCK_SIZE);
|
|
err = fscrypt_decrypt_page(inode, virt_to_page(&dn->data), dlen,
|
|
offset_in_page(&dn->data), block);
|
|
if (err) {
|
|
ubifs_err(c, "fscrypt_decrypt_page failed: %i", err);
|
|
return err;
|
|
}
|
|
*out_len = clen;
|
|
|
|
return 0;
|
|
}
|
|
|
|
const struct fscrypt_operations ubifs_crypt_operations = {
|
|
.flags = FS_CFLG_OWN_PAGES,
|
|
.key_prefix = "ubifs:",
|
|
.get_context = ubifs_crypt_get_context,
|
|
.set_context = ubifs_crypt_set_context,
|
|
.empty_dir = ubifs_crypt_empty_dir,
|
|
.max_namelen = UBIFS_MAX_NLEN,
|
|
};
|