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crypto: vmx - Remove VLA usage of skcipher
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In the quest to remove all stack VLA usage from the kernel[1], this
replaces struct crypto_skcipher and SKCIPHER_REQUEST_ON_STACK() usage
with struct crypto_sync_skcipher and SYNC_SKCIPHER_REQUEST_ON_STACK(),
which uses a fixed stack size.

[1] https://lkml.kernel.org/r/CA+55aFzCG-zNmZwX4A2FQpadafLfEzK6CC=qPXydAacU1RqZWA@mail.gmail.com

Cc: "Leonidas S. Barbosa" <[email protected]>
Cc: Paulo Flabiano Smorigo <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Michael Ellerman <[email protected]>
Cc: [email protected]
Signed-off-by: Kees Cook <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>
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kees authored and herbertx committed Sep 28, 2018
1 parent 7f28615 commit 5c52564
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Showing 3 changed files with 29 additions and 29 deletions.
22 changes: 11 additions & 11 deletions drivers/crypto/vmx/aes_cbc.c
Original file line number Diff line number Diff line change
Expand Up @@ -32,19 +32,19 @@
#include "aesp8-ppc.h"

struct p8_aes_cbc_ctx {
struct crypto_skcipher *fallback;
struct crypto_sync_skcipher *fallback;
struct aes_key enc_key;
struct aes_key dec_key;
};

static int p8_aes_cbc_init(struct crypto_tfm *tfm)
{
const char *alg = crypto_tfm_alg_name(tfm);
struct crypto_skcipher *fallback;
struct crypto_sync_skcipher *fallback;
struct p8_aes_cbc_ctx *ctx = crypto_tfm_ctx(tfm);

fallback = crypto_alloc_skcipher(alg, 0,
CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK);
fallback = crypto_alloc_sync_skcipher(alg, 0,
CRYPTO_ALG_NEED_FALLBACK);

if (IS_ERR(fallback)) {
printk(KERN_ERR
Expand All @@ -53,7 +53,7 @@ static int p8_aes_cbc_init(struct crypto_tfm *tfm)
return PTR_ERR(fallback);
}

crypto_skcipher_set_flags(
crypto_sync_skcipher_set_flags(
fallback,
crypto_skcipher_get_flags((struct crypto_skcipher *)tfm));
ctx->fallback = fallback;
Expand All @@ -66,7 +66,7 @@ static void p8_aes_cbc_exit(struct crypto_tfm *tfm)
struct p8_aes_cbc_ctx *ctx = crypto_tfm_ctx(tfm);

if (ctx->fallback) {
crypto_free_skcipher(ctx->fallback);
crypto_free_sync_skcipher(ctx->fallback);
ctx->fallback = NULL;
}
}
Expand All @@ -86,7 +86,7 @@ static int p8_aes_cbc_setkey(struct crypto_tfm *tfm, const u8 *key,
pagefault_enable();
preempt_enable();

ret += crypto_skcipher_setkey(ctx->fallback, key, keylen);
ret += crypto_sync_skcipher_setkey(ctx->fallback, key, keylen);
return ret;
}

Expand All @@ -100,8 +100,8 @@ static int p8_aes_cbc_encrypt(struct blkcipher_desc *desc,
crypto_tfm_ctx(crypto_blkcipher_tfm(desc->tfm));

if (in_interrupt()) {
SKCIPHER_REQUEST_ON_STACK(req, ctx->fallback);
skcipher_request_set_tfm(req, ctx->fallback);
SYNC_SKCIPHER_REQUEST_ON_STACK(req, ctx->fallback);
skcipher_request_set_sync_tfm(req, ctx->fallback);
skcipher_request_set_callback(req, desc->flags, NULL, NULL);
skcipher_request_set_crypt(req, src, dst, nbytes, desc->info);
ret = crypto_skcipher_encrypt(req);
Expand Down Expand Up @@ -139,8 +139,8 @@ static int p8_aes_cbc_decrypt(struct blkcipher_desc *desc,
crypto_tfm_ctx(crypto_blkcipher_tfm(desc->tfm));

if (in_interrupt()) {
SKCIPHER_REQUEST_ON_STACK(req, ctx->fallback);
skcipher_request_set_tfm(req, ctx->fallback);
SYNC_SKCIPHER_REQUEST_ON_STACK(req, ctx->fallback);
skcipher_request_set_sync_tfm(req, ctx->fallback);
skcipher_request_set_callback(req, desc->flags, NULL, NULL);
skcipher_request_set_crypt(req, src, dst, nbytes, desc->info);
ret = crypto_skcipher_decrypt(req);
Expand Down
18 changes: 9 additions & 9 deletions drivers/crypto/vmx/aes_ctr.c
Original file line number Diff line number Diff line change
Expand Up @@ -32,26 +32,26 @@
#include "aesp8-ppc.h"

struct p8_aes_ctr_ctx {
struct crypto_skcipher *fallback;
struct crypto_sync_skcipher *fallback;
struct aes_key enc_key;
};

static int p8_aes_ctr_init(struct crypto_tfm *tfm)
{
const char *alg = crypto_tfm_alg_name(tfm);
struct crypto_skcipher *fallback;
struct crypto_sync_skcipher *fallback;
struct p8_aes_ctr_ctx *ctx = crypto_tfm_ctx(tfm);

fallback = crypto_alloc_skcipher(alg, 0,
CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK);
fallback = crypto_alloc_sync_skcipher(alg, 0,
CRYPTO_ALG_NEED_FALLBACK);
if (IS_ERR(fallback)) {
printk(KERN_ERR
"Failed to allocate transformation for '%s': %ld\n",
alg, PTR_ERR(fallback));
return PTR_ERR(fallback);
}

crypto_skcipher_set_flags(
crypto_sync_skcipher_set_flags(
fallback,
crypto_skcipher_get_flags((struct crypto_skcipher *)tfm));
ctx->fallback = fallback;
Expand All @@ -64,7 +64,7 @@ static void p8_aes_ctr_exit(struct crypto_tfm *tfm)
struct p8_aes_ctr_ctx *ctx = crypto_tfm_ctx(tfm);

if (ctx->fallback) {
crypto_free_skcipher(ctx->fallback);
crypto_free_sync_skcipher(ctx->fallback);
ctx->fallback = NULL;
}
}
Expand All @@ -83,7 +83,7 @@ static int p8_aes_ctr_setkey(struct crypto_tfm *tfm, const u8 *key,
pagefault_enable();
preempt_enable();

ret += crypto_skcipher_setkey(ctx->fallback, key, keylen);
ret += crypto_sync_skcipher_setkey(ctx->fallback, key, keylen);
return ret;
}

Expand Down Expand Up @@ -119,8 +119,8 @@ static int p8_aes_ctr_crypt(struct blkcipher_desc *desc,
crypto_tfm_ctx(crypto_blkcipher_tfm(desc->tfm));

if (in_interrupt()) {
SKCIPHER_REQUEST_ON_STACK(req, ctx->fallback);
skcipher_request_set_tfm(req, ctx->fallback);
SYNC_SKCIPHER_REQUEST_ON_STACK(req, ctx->fallback);
skcipher_request_set_sync_tfm(req, ctx->fallback);
skcipher_request_set_callback(req, desc->flags, NULL, NULL);
skcipher_request_set_crypt(req, src, dst, nbytes, desc->info);
ret = crypto_skcipher_encrypt(req);
Expand Down
18 changes: 9 additions & 9 deletions drivers/crypto/vmx/aes_xts.c
Original file line number Diff line number Diff line change
Expand Up @@ -33,7 +33,7 @@
#include "aesp8-ppc.h"

struct p8_aes_xts_ctx {
struct crypto_skcipher *fallback;
struct crypto_sync_skcipher *fallback;
struct aes_key enc_key;
struct aes_key dec_key;
struct aes_key tweak_key;
Expand All @@ -42,19 +42,19 @@ struct p8_aes_xts_ctx {
static int p8_aes_xts_init(struct crypto_tfm *tfm)
{
const char *alg = crypto_tfm_alg_name(tfm);
struct crypto_skcipher *fallback;
struct crypto_sync_skcipher *fallback;
struct p8_aes_xts_ctx *ctx = crypto_tfm_ctx(tfm);

fallback = crypto_alloc_skcipher(alg, 0,
CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK);
fallback = crypto_alloc_sync_skcipher(alg, 0,
CRYPTO_ALG_NEED_FALLBACK);
if (IS_ERR(fallback)) {
printk(KERN_ERR
"Failed to allocate transformation for '%s': %ld\n",
alg, PTR_ERR(fallback));
return PTR_ERR(fallback);
}

crypto_skcipher_set_flags(
crypto_sync_skcipher_set_flags(
fallback,
crypto_skcipher_get_flags((struct crypto_skcipher *)tfm));
ctx->fallback = fallback;
Expand All @@ -67,7 +67,7 @@ static void p8_aes_xts_exit(struct crypto_tfm *tfm)
struct p8_aes_xts_ctx *ctx = crypto_tfm_ctx(tfm);

if (ctx->fallback) {
crypto_free_skcipher(ctx->fallback);
crypto_free_sync_skcipher(ctx->fallback);
ctx->fallback = NULL;
}
}
Expand All @@ -92,7 +92,7 @@ static int p8_aes_xts_setkey(struct crypto_tfm *tfm, const u8 *key,
pagefault_enable();
preempt_enable();

ret += crypto_skcipher_setkey(ctx->fallback, key, keylen);
ret += crypto_sync_skcipher_setkey(ctx->fallback, key, keylen);
return ret;
}

Expand All @@ -109,8 +109,8 @@ static int p8_aes_xts_crypt(struct blkcipher_desc *desc,
crypto_tfm_ctx(crypto_blkcipher_tfm(desc->tfm));

if (in_interrupt()) {
SKCIPHER_REQUEST_ON_STACK(req, ctx->fallback);
skcipher_request_set_tfm(req, ctx->fallback);
SYNC_SKCIPHER_REQUEST_ON_STACK(req, ctx->fallback);
skcipher_request_set_sync_tfm(req, ctx->fallback);
skcipher_request_set_callback(req, desc->flags, NULL, NULL);
skcipher_request_set_crypt(req, src, dst, nbytes, desc->info);
ret = enc? crypto_skcipher_encrypt(req) : crypto_skcipher_decrypt(req);
Expand Down

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