linux-kernel - Re: [PATCH] crypto: testmgr - reduce stack usage in fuzzers

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Message-ID: <20190617140435.qjzcouaqzepaicf4@gondor.apana.org.au>
Date:   Mon, 17 Jun 2019 22:04:36 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Arnd Bergmann <arnd@...db.de>, Kees Cook <keescook@...omium.org>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Biggers <ebiggers@...gle.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Vitaly Chikunov <vt@...linux.org>,
        Gilad Ben-Yossef <gilad@...yossef.com>,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] crypto: testmgr - reduce stack usage in fuzzers

On Mon, Jun 17, 2019 at 03:23:02PM +0200, Arnd Bergmann wrote:
> On arm32, we get warnings about high stack usage in some of the functions:
> 
> crypto/testmgr.c:2269:12: error: stack frame size of 1032 bytes in function 'alg_test_aead' [-Werror,-Wframe-larger-than=]
> static int alg_test_aead(const struct alg_test_desc *desc, const char *driver,
>            ^
> crypto/testmgr.c:1693:12: error: stack frame size of 1312 bytes in function '__alg_test_hash' [-Werror,-Wframe-larger-than=]
> static int __alg_test_hash(const struct hash_testvec *vecs,
>            ^
> 
> On of the larger objects on the stack here is struct testvec_config, so
> change that to dynamic allocation.
> 
> Fixes: 40153b10d91c ("crypto: testmgr - fuzz AEADs against their generic implementation")
> Fixes: d435e10e67be ("crypto: testmgr - fuzz skciphers against their generic implementation")
> Fixes: 9a8a6b3f0950 ("crypto: testmgr - fuzz hashes against their generic implementation")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
> I only compile-tested this, and it's not completely trivial, so please
> review carefully.

These structures are not meant to be that big.  I suspect something
has gone awry with the recent security conversions.

Kees?
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt