From a791fc62a5749a8511cfdaf60e89923dc7648531 Mon Sep 17 00:00:00 2001 From: Herbert Xu Date: Wed, 11 Dec 2019 10:50:11 +0800 Subject: [PATCH] crypto: api - fix unexpectedly getting generic implementation commit 2bbb3375d967155bccc86a5887d4a6e29c56b683 upstream. When CONFIG_CRYPTO_MANAGER_EXTRA_TESTS=y, the first lookup of an algorithm that needs to be instantiated using a template will always get the generic implementation, even when an accelerated one is available. This happens because the extra self-tests for the accelerated implementation allocate the generic implementation for comparison purposes, and then crypto_alg_tested() for the generic implementation "fulfills" the original request (i.e. sets crypto_larval::adult). This patch fixes this by only fulfilling the original request if we are currently the best outstanding larval as judged by the priority. If we're not the best then we will ask all waiters on that larval request to retry the lookup. Note that this patch introduces a behaviour change when the module providing the new algorithm is unregistered during the process. Previously we would have failed with ENOENT, after the patch we will instead redo the lookup. Fixes: 9a8a6b3f0950 ("crypto: testmgr - fuzz hashes against...") Fixes: d435e10e67be ("crypto: testmgr - fuzz skciphers against...") Fixes: 40153b10d91c ("crypto: testmgr - fuzz AEADs against...") Reported-by: Eric Biggers Signed-off-by: Herbert Xu Reviewed-by: Eric Biggers Signed-off-by: Herbert Xu Signed-off-by: Greg Kroah-Hartman --- crypto/algapi.c | 24 +++++++++++++++++++++--- crypto/api.c | 4 +++- 2 files changed, 24 insertions(+), 4 deletions(-) diff --git a/crypto/algapi.c b/crypto/algapi.c index b860889ec99d..5167a4f6f0ed 100644 --- a/crypto/algapi.c +++ b/crypto/algapi.c @@ -257,6 +257,7 @@ void crypto_alg_tested(const char *name, int err) struct crypto_alg *alg; struct crypto_alg *q; LIST_HEAD(list); + bool best; down_write(&crypto_alg_sem); list_for_each_entry(q, &crypto_alg_list, cra_list) { @@ -280,6 +281,21 @@ void crypto_alg_tested(const char *name, int err) alg->cra_flags |= CRYPTO_ALG_TESTED; + /* Only satisfy larval waiters if we are the best. */ + best = true; + list_for_each_entry(q, &crypto_alg_list, cra_list) { + if (crypto_is_moribund(q) || !crypto_is_larval(q)) + continue; + + if (strcmp(alg->cra_name, q->cra_name)) + continue; + + if (q->cra_priority > alg->cra_priority) { + best = false; + break; + } + } + list_for_each_entry(q, &crypto_alg_list, cra_list) { if (q == alg) continue; @@ -303,10 +319,12 @@ void crypto_alg_tested(const char *name, int err) continue; if ((q->cra_flags ^ alg->cra_flags) & larval->mask) continue; - if (!crypto_mod_get(alg)) - continue; - larval->adult = alg; + if (best && crypto_mod_get(alg)) + larval->adult = alg; + else + larval->adult = ERR_PTR(-EAGAIN); + continue; } diff --git a/crypto/api.c b/crypto/api.c index d8ba54142620..9f99d0e70384 100644 --- a/crypto/api.c +++ b/crypto/api.c @@ -97,7 +97,7 @@ static void crypto_larval_destroy(struct crypto_alg *alg) struct crypto_larval *larval = (void *)alg; BUG_ON(!crypto_is_larval(alg)); - if (larval->adult) + if (!IS_ERR_OR_NULL(larval->adult)) crypto_mod_put(larval->adult); kfree(larval); } @@ -178,6 +178,8 @@ static struct crypto_alg *crypto_larval_wait(struct crypto_alg *alg) alg = ERR_PTR(-ETIMEDOUT); else if (!alg) alg = ERR_PTR(-ENOENT); + else if (IS_ERR(alg)) + ; else if (crypto_is_test_larval(larval) && !(alg->cra_flags & CRYPTO_ALG_TESTED)) alg = ERR_PTR(-EAGAIN);