2008-08-18 07:02:08

by Christian Hohnstaedt

[permalink] [raw]
Subject: [PATCH] crypto: fix larval lookup


crypto_alg_mod_lookup() runs in a timeout (60s) for unknown algos.

crypto_larval_error() doesn't find the larval and thus doesn't
finish crypto_larval_wait, because
the larval->mask has the CRYPTO_ALG_TESTED bit set, while
crypto_alg_lookup() is called without that bit in the mask
and the mask comparison in __crypto_alg_lookup fails.

Since larvals itself never get tested, it seems ok to
reset that bit.

Signed-off-by: Christian Hohnstaedt <[email protected]>
---
crypto/api.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/crypto/api.c b/crypto/api.c
index cd232d4..0a4012e 100644
--- a/crypto/api.c
+++ b/crypto/api.c
@@ -118,7 +118,7 @@ struct crypto_larval *crypto_larval_alloc(const char *name, u32 type, u32 mask)
if (!larval)
return ERR_PTR(-ENOMEM);

- larval->mask = mask;
+ larval->mask = mask & ~CRYPTO_ALG_TESTED;
larval->alg.cra_flags = CRYPTO_ALG_LARVAL | type;
larval->alg.cra_priority = -1;
larval->alg.cra_destroy = crypto_larval_destroy;
--
1.5.6.3



2008-08-19 05:05:48

by Herbert Xu

[permalink] [raw]
Subject: Re: [PATCH] crypto: fix larval lookup

Christian Hohnstaedt <[email protected]> wrote:
>
> crypto_alg_mod_lookup() runs in a timeout (60s) for unknown algos.
>
> crypto_larval_error() doesn't find the larval and thus doesn't
> finish crypto_larval_wait, because
> the larval->mask has the CRYPTO_ALG_TESTED bit set, while
> crypto_alg_lookup() is called without that bit in the mask
> and the mask comparison in __crypto_alg_lookup fails.
>
> Since larvals itself never get tested, it seems ok to
> reset that bit.
>
> Signed-off-by: Christian Hohnstaedt <[email protected]>

Thanks for catching this! However, we do want to keep the TESTED
bit in case someone specifically requests for an untested algorithm.

So I'm going to fix it as follows, by using the original type
and mask for error propagation.

Cheers,
--
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <[email protected]r.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
--
diff --git a/crypto/algboss.c b/crypto/algboss.c
index a635784..d6dc18f 100644
--- a/crypto/algboss.c
+++ b/crypto/algboss.c
@@ -45,6 +45,9 @@ struct cryptomgr_param {

char larval[CRYPTO_MAX_ALG_NAME];
char template[CRYPTO_MAX_ALG_NAME];
+
+ u32 otype;
+ u32 omask;
};

struct crypto_test_param {
@@ -82,8 +85,7 @@ out:
module_put_and_exit(0);

err:
- crypto_larval_error(param->larval, param->type.data.type,
- param->type.data.mask);
+ crypto_larval_error(param->larval, param->otype, param->omask);
goto out;
}

@@ -179,6 +181,9 @@ static int cryptomgr_schedule_probe(struct crypto_larval *larval)
param->type.data.mask = larval->mask & ~CRYPTO_ALG_TESTED;
param->tb[0] = &param->type.attr;

+ param->otype = larval->alg.cra_flags;
+ param->omask = larval->mask;
+
memcpy(param->larval, larval->alg.cra_name, CRYPTO_MAX_ALG_NAME);

thread = kthread_run(cryptomgr_probe, param, "cryptomgr_probe");