Messages in this thread | | | From | Kees Cook <> | Date | Tue, 26 Jun 2018 09:45:09 -0700 | Subject | Re: [PATCH v2 11/11] crypto: skcipher: Remove VLA usage for SKCIPHER_REQUEST_ON_STACK |
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On Tue, Jun 26, 2018 at 2:20 AM, Herbert Xu <herbert@gondor.apana.org.au> wrote: > On Mon, Jun 25, 2018 at 02:10:26PM -0700, Kees Cook wrote: >> In the quest to remove all stack VLA usage from the kernel[1], this >> caps the skcipher request size similar to other limits and adds a >> sanity check at registration. In a manual review of the callers of >> crypto_skcipher_set_reqsize(), the largest was 384: >> >> 4 sun4i_cipher_req_ctx >> 6 safexcel_cipher_req >> 8 cryptd_skcipher_request_ctx >> 80 cipher_req_ctx >> 80 skcipher_request >> 96 crypto_rfc3686_req_ctx >> 104 nitrox_kcrypt_request >> 144 mv_cesa_skcipher_std_req >> 384 rctx >> >> [1] https://lkml.kernel.org/r/CA+55aFzCG-zNmZwX4A2FQpadafLfEzK6CC=qPXydAacU1RqZWA@mail.gmail.com >> >> Cc: Herbert Xu <herbert@gondor.apana.org.au> >> Cc: "David S. Miller" <davem@davemloft.net> >> Cc: linux-crypto@vger.kernel.org >> Signed-off-by: Kees Cook <keescook@chromium.org> > > This has the same issue as the ahash reqsize patch.
Which are likely to be wrapped together? Should I take this to 512 or something else?
-Kees
-- Kees Cook Pixel Security
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