mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
![Sebastian Siewior](/assets/img/avatar_default.png)
setkey() in {cipher,blkcipher,ablkcipher,hash}.c does not respect the requested alignment by the algorithm. This patch fixes it. The extra memory is allocated by kmalloc() with GFP_ATOMIC flag. Signed-off-by: Sebastian Siewior <linux-crypto@ml.breakpoint.cc> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
494 lines
13 KiB
C
494 lines
13 KiB
C
/*
|
|
* Block chaining cipher operations.
|
|
*
|
|
* Generic encrypt/decrypt wrapper for ciphers, handles operations across
|
|
* multiple page boundaries by using temporary blocks. In user context,
|
|
* the kernel is given a chance to schedule us once per page.
|
|
*
|
|
* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the Free
|
|
* Software Foundation; either version 2 of the License, or (at your option)
|
|
* any later version.
|
|
*
|
|
*/
|
|
|
|
#include <linux/crypto.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/hardirq.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/scatterlist.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/string.h>
|
|
|
|
#include "internal.h"
|
|
#include "scatterwalk.h"
|
|
|
|
enum {
|
|
BLKCIPHER_WALK_PHYS = 1 << 0,
|
|
BLKCIPHER_WALK_SLOW = 1 << 1,
|
|
BLKCIPHER_WALK_COPY = 1 << 2,
|
|
BLKCIPHER_WALK_DIFF = 1 << 3,
|
|
};
|
|
|
|
static int blkcipher_walk_next(struct blkcipher_desc *desc,
|
|
struct blkcipher_walk *walk);
|
|
static int blkcipher_walk_first(struct blkcipher_desc *desc,
|
|
struct blkcipher_walk *walk);
|
|
|
|
static inline void blkcipher_map_src(struct blkcipher_walk *walk)
|
|
{
|
|
walk->src.virt.addr = scatterwalk_map(&walk->in, 0);
|
|
}
|
|
|
|
static inline void blkcipher_map_dst(struct blkcipher_walk *walk)
|
|
{
|
|
walk->dst.virt.addr = scatterwalk_map(&walk->out, 1);
|
|
}
|
|
|
|
static inline void blkcipher_unmap_src(struct blkcipher_walk *walk)
|
|
{
|
|
scatterwalk_unmap(walk->src.virt.addr, 0);
|
|
}
|
|
|
|
static inline void blkcipher_unmap_dst(struct blkcipher_walk *walk)
|
|
{
|
|
scatterwalk_unmap(walk->dst.virt.addr, 1);
|
|
}
|
|
|
|
static inline u8 *blkcipher_get_spot(u8 *start, unsigned int len)
|
|
{
|
|
if (offset_in_page(start + len) < len)
|
|
return (u8 *)((unsigned long)(start + len) & PAGE_MASK);
|
|
return start;
|
|
}
|
|
|
|
static inline unsigned int blkcipher_done_slow(struct crypto_blkcipher *tfm,
|
|
struct blkcipher_walk *walk,
|
|
unsigned int bsize)
|
|
{
|
|
u8 *addr;
|
|
unsigned int alignmask = crypto_blkcipher_alignmask(tfm);
|
|
|
|
addr = (u8 *)ALIGN((unsigned long)walk->buffer, alignmask + 1);
|
|
addr = blkcipher_get_spot(addr, bsize);
|
|
scatterwalk_copychunks(addr, &walk->out, bsize, 1);
|
|
return bsize;
|
|
}
|
|
|
|
static inline unsigned int blkcipher_done_fast(struct blkcipher_walk *walk,
|
|
unsigned int n)
|
|
{
|
|
n = walk->nbytes - n;
|
|
|
|
if (walk->flags & BLKCIPHER_WALK_COPY) {
|
|
blkcipher_map_dst(walk);
|
|
memcpy(walk->dst.virt.addr, walk->page, n);
|
|
blkcipher_unmap_dst(walk);
|
|
} else if (!(walk->flags & BLKCIPHER_WALK_PHYS)) {
|
|
blkcipher_unmap_src(walk);
|
|
if (walk->flags & BLKCIPHER_WALK_DIFF)
|
|
blkcipher_unmap_dst(walk);
|
|
}
|
|
|
|
scatterwalk_advance(&walk->in, n);
|
|
scatterwalk_advance(&walk->out, n);
|
|
|
|
return n;
|
|
}
|
|
|
|
int blkcipher_walk_done(struct blkcipher_desc *desc,
|
|
struct blkcipher_walk *walk, int err)
|
|
{
|
|
struct crypto_blkcipher *tfm = desc->tfm;
|
|
unsigned int nbytes = 0;
|
|
|
|
if (likely(err >= 0)) {
|
|
unsigned int bsize = crypto_blkcipher_blocksize(tfm);
|
|
unsigned int n;
|
|
|
|
if (likely(!(walk->flags & BLKCIPHER_WALK_SLOW)))
|
|
n = blkcipher_done_fast(walk, err);
|
|
else
|
|
n = blkcipher_done_slow(tfm, walk, bsize);
|
|
|
|
nbytes = walk->total - n;
|
|
err = 0;
|
|
}
|
|
|
|
scatterwalk_done(&walk->in, 0, nbytes);
|
|
scatterwalk_done(&walk->out, 1, nbytes);
|
|
|
|
walk->total = nbytes;
|
|
walk->nbytes = nbytes;
|
|
|
|
if (nbytes) {
|
|
crypto_yield(desc->flags);
|
|
return blkcipher_walk_next(desc, walk);
|
|
}
|
|
|
|
if (walk->iv != desc->info)
|
|
memcpy(desc->info, walk->iv, crypto_blkcipher_ivsize(tfm));
|
|
if (walk->buffer != walk->page)
|
|
kfree(walk->buffer);
|
|
if (walk->page)
|
|
free_page((unsigned long)walk->page);
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(blkcipher_walk_done);
|
|
|
|
static inline int blkcipher_next_slow(struct blkcipher_desc *desc,
|
|
struct blkcipher_walk *walk,
|
|
unsigned int bsize,
|
|
unsigned int alignmask)
|
|
{
|
|
unsigned int n;
|
|
|
|
if (walk->buffer)
|
|
goto ok;
|
|
|
|
walk->buffer = walk->page;
|
|
if (walk->buffer)
|
|
goto ok;
|
|
|
|
n = bsize * 2 + (alignmask & ~(crypto_tfm_ctx_alignment() - 1));
|
|
walk->buffer = kmalloc(n, GFP_ATOMIC);
|
|
if (!walk->buffer)
|
|
return blkcipher_walk_done(desc, walk, -ENOMEM);
|
|
|
|
ok:
|
|
walk->dst.virt.addr = (u8 *)ALIGN((unsigned long)walk->buffer,
|
|
alignmask + 1);
|
|
walk->dst.virt.addr = blkcipher_get_spot(walk->dst.virt.addr, bsize);
|
|
walk->src.virt.addr = blkcipher_get_spot(walk->dst.virt.addr + bsize,
|
|
bsize);
|
|
|
|
scatterwalk_copychunks(walk->src.virt.addr, &walk->in, bsize, 0);
|
|
|
|
walk->nbytes = bsize;
|
|
walk->flags |= BLKCIPHER_WALK_SLOW;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int blkcipher_next_copy(struct blkcipher_walk *walk)
|
|
{
|
|
u8 *tmp = walk->page;
|
|
|
|
blkcipher_map_src(walk);
|
|
memcpy(tmp, walk->src.virt.addr, walk->nbytes);
|
|
blkcipher_unmap_src(walk);
|
|
|
|
walk->src.virt.addr = tmp;
|
|
walk->dst.virt.addr = tmp;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int blkcipher_next_fast(struct blkcipher_desc *desc,
|
|
struct blkcipher_walk *walk)
|
|
{
|
|
unsigned long diff;
|
|
|
|
walk->src.phys.page = scatterwalk_page(&walk->in);
|
|
walk->src.phys.offset = offset_in_page(walk->in.offset);
|
|
walk->dst.phys.page = scatterwalk_page(&walk->out);
|
|
walk->dst.phys.offset = offset_in_page(walk->out.offset);
|
|
|
|
if (walk->flags & BLKCIPHER_WALK_PHYS)
|
|
return 0;
|
|
|
|
diff = walk->src.phys.offset - walk->dst.phys.offset;
|
|
diff |= walk->src.virt.page - walk->dst.virt.page;
|
|
|
|
blkcipher_map_src(walk);
|
|
walk->dst.virt.addr = walk->src.virt.addr;
|
|
|
|
if (diff) {
|
|
walk->flags |= BLKCIPHER_WALK_DIFF;
|
|
blkcipher_map_dst(walk);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int blkcipher_walk_next(struct blkcipher_desc *desc,
|
|
struct blkcipher_walk *walk)
|
|
{
|
|
struct crypto_blkcipher *tfm = desc->tfm;
|
|
unsigned int alignmask = crypto_blkcipher_alignmask(tfm);
|
|
unsigned int bsize = crypto_blkcipher_blocksize(tfm);
|
|
unsigned int n;
|
|
int err;
|
|
|
|
n = walk->total;
|
|
if (unlikely(n < bsize)) {
|
|
desc->flags |= CRYPTO_TFM_RES_BAD_BLOCK_LEN;
|
|
return blkcipher_walk_done(desc, walk, -EINVAL);
|
|
}
|
|
|
|
walk->flags &= ~(BLKCIPHER_WALK_SLOW | BLKCIPHER_WALK_COPY |
|
|
BLKCIPHER_WALK_DIFF);
|
|
if (!scatterwalk_aligned(&walk->in, alignmask) ||
|
|
!scatterwalk_aligned(&walk->out, alignmask)) {
|
|
walk->flags |= BLKCIPHER_WALK_COPY;
|
|
if (!walk->page) {
|
|
walk->page = (void *)__get_free_page(GFP_ATOMIC);
|
|
if (!walk->page)
|
|
n = 0;
|
|
}
|
|
}
|
|
|
|
n = scatterwalk_clamp(&walk->in, n);
|
|
n = scatterwalk_clamp(&walk->out, n);
|
|
|
|
if (unlikely(n < bsize)) {
|
|
err = blkcipher_next_slow(desc, walk, bsize, alignmask);
|
|
goto set_phys_lowmem;
|
|
}
|
|
|
|
walk->nbytes = n;
|
|
if (walk->flags & BLKCIPHER_WALK_COPY) {
|
|
err = blkcipher_next_copy(walk);
|
|
goto set_phys_lowmem;
|
|
}
|
|
|
|
return blkcipher_next_fast(desc, walk);
|
|
|
|
set_phys_lowmem:
|
|
if (walk->flags & BLKCIPHER_WALK_PHYS) {
|
|
walk->src.phys.page = virt_to_page(walk->src.virt.addr);
|
|
walk->dst.phys.page = virt_to_page(walk->dst.virt.addr);
|
|
walk->src.phys.offset &= PAGE_SIZE - 1;
|
|
walk->dst.phys.offset &= PAGE_SIZE - 1;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static inline int blkcipher_copy_iv(struct blkcipher_walk *walk,
|
|
struct crypto_blkcipher *tfm,
|
|
unsigned int alignmask)
|
|
{
|
|
unsigned bs = crypto_blkcipher_blocksize(tfm);
|
|
unsigned int ivsize = crypto_blkcipher_ivsize(tfm);
|
|
unsigned int size = bs * 2 + ivsize + max(bs, ivsize) - (alignmask + 1);
|
|
u8 *iv;
|
|
|
|
size += alignmask & ~(crypto_tfm_ctx_alignment() - 1);
|
|
walk->buffer = kmalloc(size, GFP_ATOMIC);
|
|
if (!walk->buffer)
|
|
return -ENOMEM;
|
|
|
|
iv = (u8 *)ALIGN((unsigned long)walk->buffer, alignmask + 1);
|
|
iv = blkcipher_get_spot(iv, bs) + bs;
|
|
iv = blkcipher_get_spot(iv, bs) + bs;
|
|
iv = blkcipher_get_spot(iv, ivsize);
|
|
|
|
walk->iv = memcpy(iv, walk->iv, ivsize);
|
|
return 0;
|
|
}
|
|
|
|
int blkcipher_walk_virt(struct blkcipher_desc *desc,
|
|
struct blkcipher_walk *walk)
|
|
{
|
|
walk->flags &= ~BLKCIPHER_WALK_PHYS;
|
|
return blkcipher_walk_first(desc, walk);
|
|
}
|
|
EXPORT_SYMBOL_GPL(blkcipher_walk_virt);
|
|
|
|
int blkcipher_walk_phys(struct blkcipher_desc *desc,
|
|
struct blkcipher_walk *walk)
|
|
{
|
|
walk->flags |= BLKCIPHER_WALK_PHYS;
|
|
return blkcipher_walk_first(desc, walk);
|
|
}
|
|
EXPORT_SYMBOL_GPL(blkcipher_walk_phys);
|
|
|
|
static int blkcipher_walk_first(struct blkcipher_desc *desc,
|
|
struct blkcipher_walk *walk)
|
|
{
|
|
struct crypto_blkcipher *tfm = desc->tfm;
|
|
unsigned int alignmask = crypto_blkcipher_alignmask(tfm);
|
|
|
|
if (WARN_ON_ONCE(in_irq()))
|
|
return -EDEADLK;
|
|
|
|
walk->nbytes = walk->total;
|
|
if (unlikely(!walk->total))
|
|
return 0;
|
|
|
|
walk->buffer = NULL;
|
|
walk->iv = desc->info;
|
|
if (unlikely(((unsigned long)walk->iv & alignmask))) {
|
|
int err = blkcipher_copy_iv(walk, tfm, alignmask);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
scatterwalk_start(&walk->in, walk->in.sg);
|
|
scatterwalk_start(&walk->out, walk->out.sg);
|
|
walk->page = NULL;
|
|
|
|
return blkcipher_walk_next(desc, walk);
|
|
}
|
|
|
|
static int setkey_unaligned(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
|
|
{
|
|
struct blkcipher_alg *cipher = &tfm->__crt_alg->cra_blkcipher;
|
|
unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
|
|
int ret;
|
|
u8 *buffer, *alignbuffer;
|
|
unsigned long absize;
|
|
|
|
absize = keylen + alignmask;
|
|
buffer = kmalloc(absize, GFP_ATOMIC);
|
|
if (!buffer)
|
|
return -ENOMEM;
|
|
|
|
alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
|
|
memcpy(alignbuffer, key, keylen);
|
|
ret = cipher->setkey(tfm, alignbuffer, keylen);
|
|
memset(alignbuffer, 0, absize);
|
|
kfree(buffer);
|
|
return ret;
|
|
}
|
|
|
|
static int setkey(struct crypto_tfm *tfm, const u8 *key,
|
|
unsigned int keylen)
|
|
{
|
|
struct blkcipher_alg *cipher = &tfm->__crt_alg->cra_blkcipher;
|
|
unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
|
|
|
|
if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) {
|
|
tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
|
|
return -EINVAL;
|
|
}
|
|
|
|
if ((unsigned long)key & alignmask)
|
|
return setkey_unaligned(tfm, key, keylen);
|
|
|
|
return cipher->setkey(tfm, key, keylen);
|
|
}
|
|
|
|
static int async_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
|
|
unsigned int keylen)
|
|
{
|
|
return setkey(crypto_ablkcipher_tfm(tfm), key, keylen);
|
|
}
|
|
|
|
static int async_encrypt(struct ablkcipher_request *req)
|
|
{
|
|
struct crypto_tfm *tfm = req->base.tfm;
|
|
struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
|
|
struct blkcipher_desc desc = {
|
|
.tfm = __crypto_blkcipher_cast(tfm),
|
|
.info = req->info,
|
|
.flags = req->base.flags,
|
|
};
|
|
|
|
|
|
return alg->encrypt(&desc, req->dst, req->src, req->nbytes);
|
|
}
|
|
|
|
static int async_decrypt(struct ablkcipher_request *req)
|
|
{
|
|
struct crypto_tfm *tfm = req->base.tfm;
|
|
struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
|
|
struct blkcipher_desc desc = {
|
|
.tfm = __crypto_blkcipher_cast(tfm),
|
|
.info = req->info,
|
|
.flags = req->base.flags,
|
|
};
|
|
|
|
return alg->decrypt(&desc, req->dst, req->src, req->nbytes);
|
|
}
|
|
|
|
static unsigned int crypto_blkcipher_ctxsize(struct crypto_alg *alg, u32 type,
|
|
u32 mask)
|
|
{
|
|
struct blkcipher_alg *cipher = &alg->cra_blkcipher;
|
|
unsigned int len = alg->cra_ctxsize;
|
|
|
|
type ^= CRYPTO_ALG_ASYNC;
|
|
mask &= CRYPTO_ALG_ASYNC;
|
|
if ((type & mask) && cipher->ivsize) {
|
|
len = ALIGN(len, (unsigned long)alg->cra_alignmask + 1);
|
|
len += cipher->ivsize;
|
|
}
|
|
|
|
return len;
|
|
}
|
|
|
|
static int crypto_init_blkcipher_ops_async(struct crypto_tfm *tfm)
|
|
{
|
|
struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
|
|
struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
|
|
|
|
crt->setkey = async_setkey;
|
|
crt->encrypt = async_encrypt;
|
|
crt->decrypt = async_decrypt;
|
|
crt->ivsize = alg->ivsize;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int crypto_init_blkcipher_ops_sync(struct crypto_tfm *tfm)
|
|
{
|
|
struct blkcipher_tfm *crt = &tfm->crt_blkcipher;
|
|
struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
|
|
unsigned long align = crypto_tfm_alg_alignmask(tfm) + 1;
|
|
unsigned long addr;
|
|
|
|
crt->setkey = setkey;
|
|
crt->encrypt = alg->encrypt;
|
|
crt->decrypt = alg->decrypt;
|
|
|
|
addr = (unsigned long)crypto_tfm_ctx(tfm);
|
|
addr = ALIGN(addr, align);
|
|
addr += ALIGN(tfm->__crt_alg->cra_ctxsize, align);
|
|
crt->iv = (void *)addr;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int crypto_init_blkcipher_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
|
|
{
|
|
struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
|
|
|
|
if (alg->ivsize > PAGE_SIZE / 8)
|
|
return -EINVAL;
|
|
|
|
type ^= CRYPTO_ALG_ASYNC;
|
|
mask &= CRYPTO_ALG_ASYNC;
|
|
if (type & mask)
|
|
return crypto_init_blkcipher_ops_sync(tfm);
|
|
else
|
|
return crypto_init_blkcipher_ops_async(tfm);
|
|
}
|
|
|
|
static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg)
|
|
__attribute__ ((unused));
|
|
static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg)
|
|
{
|
|
seq_printf(m, "type : blkcipher\n");
|
|
seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
|
|
seq_printf(m, "min keysize : %u\n", alg->cra_blkcipher.min_keysize);
|
|
seq_printf(m, "max keysize : %u\n", alg->cra_blkcipher.max_keysize);
|
|
seq_printf(m, "ivsize : %u\n", alg->cra_blkcipher.ivsize);
|
|
}
|
|
|
|
const struct crypto_type crypto_blkcipher_type = {
|
|
.ctxsize = crypto_blkcipher_ctxsize,
|
|
.init = crypto_init_blkcipher_ops,
|
|
#ifdef CONFIG_PROC_FS
|
|
.show = crypto_blkcipher_show,
|
|
#endif
|
|
};
|
|
EXPORT_SYMBOL_GPL(crypto_blkcipher_type);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("Generic block chaining cipher type");
|