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Subject[PATCH crypto-next 06/23] x86/fpu: Remove VLA usage of skcipher
Date
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: x86@kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
---
arch/x86/crypto/fpu.c | 30 ++++++++++++++++--------------
1 file changed, 16 insertions(+), 14 deletions(-)

diff --git a/arch/x86/crypto/fpu.c b/arch/x86/crypto/fpu.c
index 406680476c52..be9b3766f241 100644
--- a/arch/x86/crypto/fpu.c
+++ b/arch/x86/crypto/fpu.c
@@ -20,21 +20,23 @@
#include <asm/fpu/api.h>

struct crypto_fpu_ctx {
- struct crypto_skcipher *child;
+ struct crypto_sync_skcipher *child;
};

static int crypto_fpu_setkey(struct crypto_skcipher *parent, const u8 *key,
unsigned int keylen)
{
struct crypto_fpu_ctx *ctx = crypto_skcipher_ctx(parent);
- struct crypto_skcipher *child = ctx->child;
+ struct crypto_sync_skcipher *child = ctx->child;
int err;

- crypto_skcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
- crypto_skcipher_set_flags(child, crypto_skcipher_get_flags(parent) &
+ crypto_sync_skcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
+ crypto_sync_skcipher_set_flags(child,
+ crypto_skcipher_get_flags(parent) &
CRYPTO_TFM_REQ_MASK);
- err = crypto_skcipher_setkey(child, key, keylen);
- crypto_skcipher_set_flags(parent, crypto_skcipher_get_flags(child) &
+ err = crypto_sync_skcipher_setkey(child, key, keylen);
+ crypto_skcipher_set_flags(parent,
+ crypto_sync_skcipher_get_flags(child) &
CRYPTO_TFM_RES_MASK);
return err;
}
@@ -43,11 +45,11 @@ static int crypto_fpu_encrypt(struct skcipher_request *req)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct crypto_fpu_ctx *ctx = crypto_skcipher_ctx(tfm);
- struct crypto_skcipher *child = ctx->child;
- SKCIPHER_REQUEST_ON_STACK(subreq, child);
+ struct crypto_sync_skcipher *child = ctx->child;
+ SYNC_SKCIPHER_REQUEST_ON_STACK(subreq, child);
int err;

- skcipher_request_set_tfm(subreq, child);
+ skcipher_request_set_sync_tfm(subreq, child);
skcipher_request_set_callback(subreq, 0, NULL, NULL);
skcipher_request_set_crypt(subreq, req->src, req->dst, req->cryptlen,
req->iv);
@@ -64,11 +66,11 @@ static int crypto_fpu_decrypt(struct skcipher_request *req)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct crypto_fpu_ctx *ctx = crypto_skcipher_ctx(tfm);
- struct crypto_skcipher *child = ctx->child;
- SKCIPHER_REQUEST_ON_STACK(subreq, child);
+ struct crypto_sync_skcipher *child = ctx->child;
+ SYNC_SKCIPHER_REQUEST_ON_STACK(subreq, child);
int err;

- skcipher_request_set_tfm(subreq, child);
+ skcipher_request_set_sync_tfm(subreq, child);
skcipher_request_set_callback(subreq, 0, NULL, NULL);
skcipher_request_set_crypt(subreq, req->src, req->dst, req->cryptlen,
req->iv);
@@ -93,7 +95,7 @@ static int crypto_fpu_init_tfm(struct crypto_skcipher *tfm)
if (IS_ERR(cipher))
return PTR_ERR(cipher);

- ctx->child = cipher;
+ ctx->child = (struct crypto_sync_skcipher *)cipher;

return 0;
}
@@ -102,7 +104,7 @@ static void crypto_fpu_exit_tfm(struct crypto_skcipher *tfm)
{
struct crypto_fpu_ctx *ctx = crypto_skcipher_ctx(tfm);

- crypto_free_skcipher(ctx->child);
+ crypto_free_sync_skcipher(ctx->child);
}

static void crypto_fpu_free(struct skcipher_instance *inst)
--
2.17.1
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