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Message-Id: <20180717042150.37761-7-keescook@chromium.org>
Date: Mon, 16 Jul 2018 21:21:45 -0700
From: Kees Cook <keescook@...omium.org>
To: Herbert Xu <herbert@...dor.apana.org.au>
Cc: Kees Cook <keescook@...omium.org>, Arnd Bergmann <arnd@...db.de>,
Eric Biggers <ebiggers@...gle.com>,
"Gustavo A. R. Silva" <gustavo@...eddedor.com>,
Alasdair Kergon <agk@...hat.com>,
Giovanni Cabiddu <giovanni.cabiddu@...el.com>,
Lars Persson <larper@...s.com>,
Mike Snitzer <snitzer@...hat.com>,
Rabin Vincent <rabinv@...s.com>,
Tim Chen <tim.c.chen@...ux.intel.com>,
linux-crypto@...r.kernel.org, qat-linux@...el.com,
dm-devel@...hat.com, linux-kernel@...r.kernel.org
Subject: [PATCH v5 06/11] dm verity fec: Remove VLA usage
In the quest to remove all stack VLA usage from the kernel[1], this
uses the newly defined max digest size macro. Also adds a sanity-check
at use-time.
[1] https://lkml.kernel.org/r/CA+55aFzCG-zNmZwX4A2FQpadafLfEzK6CC=qPXydAacU1RqZWA@mail.gmail.com
Signed-off-by: Kees Cook <keescook@...omium.org>
---
drivers/md/dm-verity-fec.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/md/dm-verity-fec.c b/drivers/md/dm-verity-fec.c
index 684af08d0747..fe5cfd1a5fa5 100644
--- a/drivers/md/dm-verity-fec.c
+++ b/drivers/md/dm-verity-fec.c
@@ -212,12 +212,15 @@ static int fec_read_bufs(struct dm_verity *v, struct dm_verity_io *io,
struct dm_verity_fec_io *fio = fec_io(io);
u64 block, ileaved;
u8 *bbuf, *rs_block;
- u8 want_digest[v->digest_size];
+ u8 want_digest[AHASH_MAX_DIGESTSIZE];
unsigned n, k;
if (neras)
*neras = 0;
+ if (WARN_ON(v->digest_size > sizeof(want_digest)))
+ return -EINVAL;
+
/*
* read each of the rsn data blocks that are part of the RS block, and
* interleave contents to available bufs
--
2.17.1
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