linux-kernel - [PATCH 1/3] dm integrity: do not filter algos with CRYPTO_ALG_ALLOCATES

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Message-Id: <20230705164009.58351-2-giovanni.cabiddu@intel.com>
Date:   Wed,  5 Jul 2023 17:40:07 +0100
From:   Giovanni Cabiddu <giovanni.cabiddu@...el.com>
To:     herbert@...dor.apana.org.au, agk@...hat.com, snitzer@...nel.org
Cc:     linux-crypto@...r.kernel.org, dm-devel@...hat.com,
        linux-kernel@...r.kernel.org, qat-linux@...el.com,
        heinzm@...hat.com, meenakshi.aggarwal@....com, ebiggers@...nel.org,
        horia.geanta@....com, V.Sethi@....com, pankaj.gupta@....com,
        gaurav.jain@....com, davem@...emloft.net, iuliana.prodan@....com,
        Giovanni Cabiddu <giovanni.cabiddu@...el.com>,
        Fiona Trahe <fiona.trahe@...el.com>
Subject: [PATCH 1/3] dm integrity: do not filter algos with CRYPTO_ALG_ALLOCATES_MEMORY

The flag CRYPTO_ALG_ALLOCATES_MEMORY indicates that an algorithm might
allocate memory in the datapath and therefore sleep.
Dm-integrity is filtering out implementations of skcipher algorithms
that have this flag set. However, in the same function it does
allocations with GFP_KERNEL.
As dm-integrity is re-entrant and capable of handling sleeps that could
occur during allocations with GFP_KERNEL, then it is also capable of
using skcipher algorithm implementations that have
CRYPTO_ALG_ALLOCATES_MEMORY set.

Remove the filtering of skcipher implementations with the flag
CRYPTO_ALG_ALLOCATES_MEMORY set.

Suggested-by: Herbert Xu <herbert@...dor.apana.org.au>
Link: https://lore.kernel.org/linux-crypto/ZILvtASXQKLG43y9@gondor.apana.org.au/
Signed-off-by: Giovanni Cabiddu <giovanni.cabiddu@...el.com>
Reviewed-by: Fiona Trahe <fiona.trahe@...el.com>
---
 drivers/md/dm-integrity.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/md/dm-integrity.c b/drivers/md/dm-integrity.c
index 31838b13ea54..a1013eff01b4 100644
--- a/drivers/md/dm-integrity.c
+++ b/drivers/md/dm-integrity.c
@@ -3785,7 +3785,7 @@ static int create_journal(struct dm_integrity_c *ic, char **error)
 		struct journal_completion comp;
 
 		comp.ic = ic;
-		ic->journal_crypt = crypto_alloc_skcipher(ic->journal_crypt_alg.alg_string, 0, CRYPTO_ALG_ALLOCATES_MEMORY);
+		ic->journal_crypt = crypto_alloc_skcipher(ic->journal_crypt_alg.alg_string, 0, 0);
 		if (IS_ERR(ic->journal_crypt)) {
 			*error = "Invalid journal cipher";
 			r = PTR_ERR(ic->journal_crypt);
-- 
2.40.1