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crypto: api - Fix larval relookup type and mask

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When the lookup is retried after instance construction, it uses
the type and mask from the larval, which may not match the values
used by the caller.  For example, if the caller is requesting for
a !NEEDS_FALLBACK algorithm, it may end up getting an algorithm
that needs fallbacks.

Fix this by making the caller supply the type/mask and using that
for the lookup.

Reported-by: Coiby Xu <coxu@redhat.com>
Fixes: 96ad595520 ("crypto: api - Remove instance larval fulfilment")
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2025-02-14 10:31:25 +08:00
parent 70c4a5c213
commit 7505436e29
1 changed files with 7 additions and 10 deletions
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17
crypto/api.c
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@ -36,7 +36,8 @@ EXPORT_SYMBOL_GPL(crypto_chain);
DEFINE_STATIC_KEY_FALSE(__crypto_boot_test_finished);
#endif
static struct crypto_alg *crypto_larval_wait(struct crypto_alg *alg);
static struct crypto_alg *crypto_larval_wait(struct crypto_alg *alg,
u32 type, u32 mask);
static struct crypto_alg *crypto_alg_lookup(const char *name, u32 type,
u32 mask);
@ -145,7 +146,7 @@ static struct crypto_alg *crypto_larval_add(const char *name, u32 type,
if (alg != &larval->alg) {
kfree(larval);
if (crypto_is_larval(alg))
alg = crypto_larval_wait(alg);
alg = crypto_larval_wait(alg, type, mask);
}
return alg;
@ -197,7 +198,8 @@ static void crypto_start_test(struct crypto_larval *larval)
crypto_schedule_test(larval);
}
static struct crypto_alg *crypto_larval_wait(struct crypto_alg *alg)
static struct crypto_alg *crypto_larval_wait(struct crypto_alg *alg,
u32 type, u32 mask)
{
struct crypto_larval *larval;
long time_left;
@ -219,12 +221,7 @@ again:
crypto_larval_kill(larval);
alg = ERR_PTR(-ETIMEDOUT);
} else if (!alg) {
u32 type;
u32 mask;
alg = &larval->alg;
type = alg->cra_flags & ~(CRYPTO_ALG_LARVAL | CRYPTO_ALG_DEAD);
mask = larval->mask;
alg = crypto_alg_lookup(alg->cra_name, type, mask) ?:
ERR_PTR(-EAGAIN);
} else if (IS_ERR(alg))
@ -304,7 +301,7 @@ static struct crypto_alg *crypto_larval_lookup(const char *name, u32 type,
}
if (!IS_ERR_OR_NULL(alg) && crypto_is_larval(alg))
alg = crypto_larval_wait(alg);
alg = crypto_larval_wait(alg, type, mask);
else if (alg)
;
else if (!(mask & CRYPTO_ALG_TESTED))
@ -352,7 +349,7 @@ struct crypto_alg *crypto_alg_mod_lookup(const char *name, u32 type, u32 mask)
ok = crypto_probing_notify(CRYPTO_MSG_ALG_REQUEST, larval);
if (ok == NOTIFY_STOP)
alg = crypto_larval_wait(larval);
alg = crypto_larval_wait(larval, type, mask);
else {
crypto_mod_put(larval);
alg = ERR_PTR(-ENOENT);