crypto: xts - use 'spawn' for underlying single-block cipher

Since commit adad556efcdd ("crypto: api - Fix built-in testing
dependency failures"), the following warning appears when booting an
x86_64 kernel that is configured with
CONFIG_CRYPTO_MANAGER_EXTRA_TESTS=y and CONFIG_CRYPTO_AES_NI_INTEL=y,
even when CONFIG_CRYPTO_XTS=y and CONFIG_CRYPTO_AES=y:

    alg: skcipher: skipping comparison tests for xts-aes-aesni because xts(ecb(aes-generic)) is unavailable

This is caused by an issue in the xts template where it allocates an
"aes" single-block cipher without declaring a dependency on it via the
crypto_spawn mechanism.  This issue was exposed by the above commit
because it reversed the order that the algorithms are tested in.

Specifically, when "xts(ecb(aes-generic))" is instantiated and tested
during the comparison tests for "xts-aes-aesni", the "xts" template
allocates an "aes" crypto_cipher for encrypting tweaks.  This resolves
to "aes-aesni".  (Getting "aes-aesni" instead of "aes-generic" here is a
bit weird, but it's apparently intended.)  Due to the above-mentioned
commit, the testing of "aes-aesni", and the finalization of its
registration, now happens at this point instead of before.  At the end
of that, crypto_remove_spawns() unregisters all algorithm instances that
depend on a lower-priority "aes" implementation such as "aes-generic"
but that do not depend on "aes-aesni".  However, because "xts" does not
use the crypto_spawn mechanism for its "aes", its dependency on
"aes-aesni" is not recognized by crypto_remove_spawns().  Thus,
crypto_remove_spawns() unexpectedly unregisters "xts(ecb(aes-generic))".

Fix this issue by making the "xts" template use the crypto_spawn
mechanism for its "aes" dependency, like what other templates do.

Note, this fix could be applied as far back as commit f1c131b45410
("crypto: xts - Convert to skcipher").  However, the issue only got
exposed by the much more recent changes to how the crypto API runs the
self-tests, so there should be no need to backport this to very old
kernels.  Also, an alternative fix would be to flip the list iteration
order in crypto_start_tests() to restore the original testing order.
I'm thinking we should do that too, since the original order seems more
natural, but it shouldn't be relied on for correctness.

Fixes: adad556efcdd ("crypto: api - Fix built-in testing dependency failures")
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/crypto/xts.c b/crypto/xts.c
index 9237b143336729d5404bd6d67616d8b1376ea0f6..672e1a3f0b0c933f6d1bd54fb597ab68ac02f50a 100644 (file)
--- a/crypto/xts.c
+++ b/crypto/xts.c
@@ -28,7 +28,7 @@ struct xts_tfm_ctx {
 
 struct xts_instance_ctx {
        struct crypto_skcipher_spawn spawn;
-       char name[CRYPTO_MAX_ALG_NAME];
+       struct crypto_cipher_spawn tweak_spawn;
 };
 
 struct xts_request_ctx {
@@ -306,7 +306,7 @@ static int xts_init_tfm(struct crypto_skcipher *tfm)
 
        ctx->child = child;
 
-       tweak = crypto_alloc_cipher(ictx->name, 0, 0);
+       tweak = crypto_spawn_cipher(&ictx->tweak_spawn);
        if (IS_ERR(tweak)) {
                crypto_free_skcipher(ctx->child);
                return PTR_ERR(tweak);
@@ -333,12 +333,14 @@ static void xts_free_instance(struct skcipher_instance *inst)
        struct xts_instance_ctx *ictx = skcipher_instance_ctx(inst);
 
        crypto_drop_skcipher(&ictx->spawn);
+       crypto_drop_cipher(&ictx->tweak_spawn);
        kfree(inst);
 }
 
 static int xts_create(struct crypto_template *tmpl, struct rtattr **tb)
 {
        struct skcipher_alg_common *alg;
+       char name[CRYPTO_MAX_ALG_NAME];
        struct skcipher_instance *inst;
        struct xts_instance_ctx *ctx;
        const char *cipher_name;
@@ -363,13 +365,13 @@ static int xts_create(struct crypto_template *tmpl, struct rtattr **tb)
                                   cipher_name, 0, mask);
        if (err == -ENOENT) {
                err = -ENAMETOOLONG;
-               if (snprintf(ctx->name, CRYPTO_MAX_ALG_NAME, "ecb(%s)",
+               if (snprintf(name, CRYPTO_MAX_ALG_NAME, "ecb(%s)",
                             cipher_name) >= CRYPTO_MAX_ALG_NAME)
                        goto err_free_inst;
 
                err = crypto_grab_skcipher(&ctx->spawn,
                                           skcipher_crypto_instance(inst),
-                                          ctx->name, 0, mask);
+                                          name, 0, mask);
        }
 
        if (err)
@@ -398,23 +400,28 @@ static int xts_create(struct crypto_template *tmpl, struct rtattr **tb)
        if (!strncmp(cipher_name, "ecb(", 4)) {
                int len;
 
-               len = strscpy(ctx->name, cipher_name + 4, sizeof(ctx->name));
+               len = strscpy(name, cipher_name + 4, sizeof(name));
                if (len < 2)
                        goto err_free_inst;
 
-               if (ctx->name[len - 1] != ')')
+               if (name[len - 1] != ')')
                        goto err_free_inst;
 
-               ctx->name[len - 1] = 0;
+               name[len - 1] = 0;
 
                if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
-                            "xts(%s)", ctx->name) >= CRYPTO_MAX_ALG_NAME) {
+                            "xts(%s)", name) >= CRYPTO_MAX_ALG_NAME) {
                        err = -ENAMETOOLONG;
                        goto err_free_inst;
                }
        } else
                goto err_free_inst;
 
+       err = crypto_grab_cipher(&ctx->tweak_spawn,
+                                skcipher_crypto_instance(inst), name, 0, mask);
+       if (err)
+               goto err_free_inst;
+
        inst->alg.base.cra_priority = alg->base.cra_priority;
        inst->alg.base.cra_blocksize = XTS_BLOCK_SIZE;
        inst->alg.base.cra_alignmask = alg->base.cra_alignmask |