linux-stable/crypto/cipher.c
Peter Zijlstra cdd30ebb1b module: Convert symbol namespace to string literal
Clean up the existing export namespace code along the same lines of
commit 33def8498f ("treewide: Convert macro and uses of __section(foo)
to __section("foo")") and for the same reason, it is not desired for the
namespace argument to be a macro expansion itself.

Scripted using

  git grep -l -e MODULE_IMPORT_NS -e EXPORT_SYMBOL_NS | while read file;
  do
    awk -i inplace '
      /^#define EXPORT_SYMBOL_NS/ {
        gsub(/__stringify\(ns\)/, "ns");
        print;
        next;
      }
      /^#define MODULE_IMPORT_NS/ {
        gsub(/__stringify\(ns\)/, "ns");
        print;
        next;
      }
      /MODULE_IMPORT_NS/ {
        $0 = gensub(/MODULE_IMPORT_NS\(([^)]*)\)/, "MODULE_IMPORT_NS(\"\\1\")", "g");
      }
      /EXPORT_SYMBOL_NS/ {
        if ($0 ~ /(EXPORT_SYMBOL_NS[^(]*)\(([^,]+),/) {
  	if ($0 !~ /(EXPORT_SYMBOL_NS[^(]*)\(([^,]+), ([^)]+)\)/ &&
  	    $0 !~ /(EXPORT_SYMBOL_NS[^(]*)\(\)/ &&
  	    $0 !~ /^my/) {
  	  getline line;
  	  gsub(/[[:space:]]*\\$/, "");
  	  gsub(/[[:space:]]/, "", line);
  	  $0 = $0 " " line;
  	}

  	$0 = gensub(/(EXPORT_SYMBOL_NS[^(]*)\(([^,]+), ([^)]+)\)/,
  		    "\\1(\\2, \"\\3\")", "g");
        }
      }
      { print }' $file;
  done

Requested-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://mail.google.com/mail/u/2/#inbox/FMfcgzQXKWgMmjdFwwdsfgxzKpVHWPlc
Acked-by: Greg KH <gregkh@linuxfoundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2024-12-02 11:34:44 -08:00

120 lines
3.2 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Cryptographic API.
*
* Single-block cipher operations.
*
* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
* Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au>
*/
#include <crypto/algapi.h>
#include <crypto/internal/cipher.h>
#include <linux/kernel.h>
#include <linux/crypto.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/string.h>
#include "internal.h"
static int setkey_unaligned(struct crypto_cipher *tfm, const u8 *key,
unsigned int keylen)
{
struct cipher_alg *cia = crypto_cipher_alg(tfm);
unsigned long alignmask = crypto_cipher_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 = cia->cia_setkey(crypto_cipher_tfm(tfm), alignbuffer, keylen);
kfree_sensitive(buffer);
return ret;
}
int crypto_cipher_setkey(struct crypto_cipher *tfm,
const u8 *key, unsigned int keylen)
{
struct cipher_alg *cia = crypto_cipher_alg(tfm);
unsigned long alignmask = crypto_cipher_alignmask(tfm);
if (keylen < cia->cia_min_keysize || keylen > cia->cia_max_keysize)
return -EINVAL;
if ((unsigned long)key & alignmask)
return setkey_unaligned(tfm, key, keylen);
return cia->cia_setkey(crypto_cipher_tfm(tfm), key, keylen);
}
EXPORT_SYMBOL_NS_GPL(crypto_cipher_setkey, "CRYPTO_INTERNAL");
static inline void cipher_crypt_one(struct crypto_cipher *tfm,
u8 *dst, const u8 *src, bool enc)
{
unsigned long alignmask = crypto_cipher_alignmask(tfm);
struct cipher_alg *cia = crypto_cipher_alg(tfm);
void (*fn)(struct crypto_tfm *, u8 *, const u8 *) =
enc ? cia->cia_encrypt : cia->cia_decrypt;
if (unlikely(((unsigned long)dst | (unsigned long)src) & alignmask)) {
unsigned int bs = crypto_cipher_blocksize(tfm);
u8 buffer[MAX_CIPHER_BLOCKSIZE + MAX_CIPHER_ALIGNMASK];
u8 *tmp = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
memcpy(tmp, src, bs);
fn(crypto_cipher_tfm(tfm), tmp, tmp);
memcpy(dst, tmp, bs);
} else {
fn(crypto_cipher_tfm(tfm), dst, src);
}
}
void crypto_cipher_encrypt_one(struct crypto_cipher *tfm,
u8 *dst, const u8 *src)
{
cipher_crypt_one(tfm, dst, src, true);
}
EXPORT_SYMBOL_NS_GPL(crypto_cipher_encrypt_one, "CRYPTO_INTERNAL");
void crypto_cipher_decrypt_one(struct crypto_cipher *tfm,
u8 *dst, const u8 *src)
{
cipher_crypt_one(tfm, dst, src, false);
}
EXPORT_SYMBOL_NS_GPL(crypto_cipher_decrypt_one, "CRYPTO_INTERNAL");
struct crypto_cipher *crypto_clone_cipher(struct crypto_cipher *cipher)
{
struct crypto_tfm *tfm = crypto_cipher_tfm(cipher);
struct crypto_alg *alg = tfm->__crt_alg;
struct crypto_cipher *ncipher;
struct crypto_tfm *ntfm;
if (alg->cra_init)
return ERR_PTR(-ENOSYS);
if (unlikely(!crypto_mod_get(alg)))
return ERR_PTR(-ESTALE);
ntfm = __crypto_alloc_tfmgfp(alg, CRYPTO_ALG_TYPE_CIPHER,
CRYPTO_ALG_TYPE_MASK, GFP_ATOMIC);
if (IS_ERR(ntfm)) {
crypto_mod_put(alg);
return ERR_CAST(ntfm);
}
ntfm->crt_flags = tfm->crt_flags;
ncipher = __crypto_cipher_cast(ntfm);
return ncipher;
}
EXPORT_SYMBOL_GPL(crypto_clone_cipher);