From: "Jason A. Donenfeld" <Jason@zx2c4.com>
To: linux-crypto@vger.kernel.org
Cc: "Jason A. Donenfeld" <Jason@zx2c4.com>,
Ard Biesheuvel <ardb@kernel.org>,
stable@vger.kernel.org
Subject: [PATCH stable] crypto: chacha20poly1305 - prevent integer overflow on large input
Date: Thu, 6 Feb 2020 12:42:01 +0100 [thread overview]
Message-ID: <20200206114201.25438-1-Jason@zx2c4.com> (raw)
This code assigns src_len (size_t) to sl (int), which causes problems
when src_len is very large. Probably nobody in the kernel should be
passing this much data to chacha20poly1305 all in one go anyway, so I
don't think we need to change the algorithm or introduce larger types
or anything. But we should at least error out early in this case and
print a warning so that we get reports if this does happen and can look
into why anybody is possibly passing it that much data or if they're
accidently passing -1 or similar.
Fixes: d95312a3ccc0 ("crypto: lib/chacha20poly1305 - reimplement crypt_from_sg() routine")
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: stable@vger.kernel.org # 5.5+
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
---
lib/crypto/chacha20poly1305.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/lib/crypto/chacha20poly1305.c b/lib/crypto/chacha20poly1305.c
index 6d83cafebc69..ad0699ce702f 100644
--- a/lib/crypto/chacha20poly1305.c
+++ b/lib/crypto/chacha20poly1305.c
@@ -235,6 +235,9 @@ bool chacha20poly1305_crypt_sg_inplace(struct scatterlist *src,
__le64 lens[2];
} b __aligned(16);
+ if (WARN_ON(src_len > INT_MAX))
+ return false;
+
chacha_load_key(b.k, key);
b.iv[0] = 0;
--
2.25.0
next reply other threads:[~2020-02-06 11:42 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-06 11:42 Jason A. Donenfeld [this message]
2020-02-06 11:47 ` [PATCH stable] crypto: chacha20poly1305 - prevent integer overflow on large input Ard Biesheuvel
2020-02-14 6:50 ` Herbert Xu
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