From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6BF5676C9C; Tue, 20 Feb 2024 21:10:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708463441; cv=none; b=BsdXUqy1dfnZg6gS+Hg3CxUkBPNCSlK7g3wEmcUoT8bCgj1NeFUpwoNrbmKBaGktm+7HWZts1jSJKxcH7h/t1khFJ/5pvCsrm4fHmRroSWZRPWfmZatGrur5BVIPcLcTmPxe1IUxAZw8gGWwagz5o/QmRJrLhiwi5sTjuYXxhEg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708463441; c=relaxed/simple; bh=h4qldOsU8rgMcmufj72MBxNuxfRjlvjEqmft738DEIw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=PEl9QORmLNPmITknlLoVj0izSRw9De3kEcxk7O/Gwk360mFjzsnHQrx6B7q3q5JGS6peDLFdBS3Isym69y0GqZekgSS7exfq+kqmHaNiu8KOLQGu1BC5WzAJX1nj6mxqF9o0g/3E9aTuCUDG/E2okcPgT7I8VN5H8vbe2lT+YRU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=oy5hLYcu; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="oy5hLYcu" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 79140C43390; Tue, 20 Feb 2024 21:10:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1708463441; bh=h4qldOsU8rgMcmufj72MBxNuxfRjlvjEqmft738DEIw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=oy5hLYcua2+TVRXsji0gxr18E24HABsW2SB0J8P+pZi9WvmnFUTXijmdOp/m1hOb6 XYLrJ03YwPjkA5qkul6ThFwHtxJwI3XXLN2FDE+ev7vxyDwh6iuHZo0Z8rFGkRYMUd 024uI0t5+dBu3EmpVt3OEhvec2yeG17c9Zo6mEfo= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Sabrina Dubroca , Jakub Kicinski , Simon Horman , "David S. Miller" , Sasha Levin Subject: [PATCH 6.6 044/331] net: tls: fix use-after-free with partial reads and async decrypt Date: Tue, 20 Feb 2024 21:52:40 +0100 Message-ID: <20240220205638.993712405@linuxfoundation.org> X-Mailer: git-send-email 2.43.2 In-Reply-To: <20240220205637.572693592@linuxfoundation.org> References: <20240220205637.572693592@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Sabrina Dubroca [ Upstream commit 32b55c5ff9103b8508c1e04bfa5a08c64e7a925f ] tls_decrypt_sg doesn't take a reference on the pages from clear_skb, so the put_page() in tls_decrypt_done releases them, and we trigger a use-after-free in process_rx_list when we try to read from the partially-read skb. Fixes: fd31f3996af2 ("tls: rx: decrypt into a fresh skb") Signed-off-by: Sabrina Dubroca Signed-off-by: Jakub Kicinski Reviewed-by: Simon Horman Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- net/tls/tls_sw.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c index c32fce6f3563..2af8b0873da6 100644 --- a/net/tls/tls_sw.c +++ b/net/tls/tls_sw.c @@ -63,6 +63,7 @@ struct tls_decrypt_ctx { u8 iv[MAX_IV_SIZE]; u8 aad[TLS_MAX_AAD_SIZE]; u8 tail; + bool free_sgout; struct scatterlist sg[]; }; @@ -187,7 +188,6 @@ static void tls_decrypt_done(void *data, int err) struct aead_request *aead_req = data; struct crypto_aead *aead = crypto_aead_reqtfm(aead_req); struct scatterlist *sgout = aead_req->dst; - struct scatterlist *sgin = aead_req->src; struct tls_sw_context_rx *ctx; struct tls_decrypt_ctx *dctx; struct tls_context *tls_ctx; @@ -224,7 +224,7 @@ static void tls_decrypt_done(void *data, int err) } /* Free the destination pages if skb was not decrypted inplace */ - if (sgout != sgin) { + if (dctx->free_sgout) { /* Skip the first S/G entry as it points to AAD */ for_each_sg(sg_next(sgout), sg, UINT_MAX, pages) { if (!sg) @@ -1583,6 +1583,7 @@ static int tls_decrypt_sg(struct sock *sk, struct iov_iter *out_iov, } else if (out_sg) { memcpy(sgout, out_sg, n_sgout * sizeof(*sgout)); } + dctx->free_sgout = !!pages; /* Prepare and submit AEAD request */ err = tls_do_decryption(sk, sgin, sgout, dctx->iv, -- 2.43.0