mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-24 21:24:00 +08:00
5d26a105b5
This prefixes all crypto module loading with "crypto-" so we never run the risk of exposing module auto-loading to userspace via a crypto API, as demonstrated by Mathias Krause: https://lkml.org/lkml/2013/3/4/70 Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
111 lines
2.6 KiB
C
111 lines
2.6 KiB
C
/*
|
|
* Cryptographic API.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License version 2 as published by
|
|
* the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
|
* more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along with
|
|
* this program; if not, write to the Free Software Foundation, Inc., 51
|
|
* Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/crypto.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/lzo.h>
|
|
|
|
struct lzo_ctx {
|
|
void *lzo_comp_mem;
|
|
};
|
|
|
|
static int lzo_init(struct crypto_tfm *tfm)
|
|
{
|
|
struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);
|
|
|
|
ctx->lzo_comp_mem = kmalloc(LZO1X_MEM_COMPRESS,
|
|
GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
|
|
if (!ctx->lzo_comp_mem)
|
|
ctx->lzo_comp_mem = vmalloc(LZO1X_MEM_COMPRESS);
|
|
if (!ctx->lzo_comp_mem)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void lzo_exit(struct crypto_tfm *tfm)
|
|
{
|
|
struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);
|
|
|
|
kvfree(ctx->lzo_comp_mem);
|
|
}
|
|
|
|
static int lzo_compress(struct crypto_tfm *tfm, const u8 *src,
|
|
unsigned int slen, u8 *dst, unsigned int *dlen)
|
|
{
|
|
struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);
|
|
size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */
|
|
int err;
|
|
|
|
err = lzo1x_1_compress(src, slen, dst, &tmp_len, ctx->lzo_comp_mem);
|
|
|
|
if (err != LZO_E_OK)
|
|
return -EINVAL;
|
|
|
|
*dlen = tmp_len;
|
|
return 0;
|
|
}
|
|
|
|
static int lzo_decompress(struct crypto_tfm *tfm, const u8 *src,
|
|
unsigned int slen, u8 *dst, unsigned int *dlen)
|
|
{
|
|
int err;
|
|
size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */
|
|
|
|
err = lzo1x_decompress_safe(src, slen, dst, &tmp_len);
|
|
|
|
if (err != LZO_E_OK)
|
|
return -EINVAL;
|
|
|
|
*dlen = tmp_len;
|
|
return 0;
|
|
|
|
}
|
|
|
|
static struct crypto_alg alg = {
|
|
.cra_name = "lzo",
|
|
.cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
|
|
.cra_ctxsize = sizeof(struct lzo_ctx),
|
|
.cra_module = THIS_MODULE,
|
|
.cra_init = lzo_init,
|
|
.cra_exit = lzo_exit,
|
|
.cra_u = { .compress = {
|
|
.coa_compress = lzo_compress,
|
|
.coa_decompress = lzo_decompress } }
|
|
};
|
|
|
|
static int __init lzo_mod_init(void)
|
|
{
|
|
return crypto_register_alg(&alg);
|
|
}
|
|
|
|
static void __exit lzo_mod_fini(void)
|
|
{
|
|
crypto_unregister_alg(&alg);
|
|
}
|
|
|
|
module_init(lzo_mod_init);
|
|
module_exit(lzo_mod_fini);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("LZO Compression Algorithm");
|
|
MODULE_ALIAS_CRYPTO("lzo");
|