From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 C049322CBE6; Mon, 17 Aug 2026 14:26:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786976794; cv=none; b=bGHs4+EfzBKIc5oEmWVAIyuC4qKc2t4rwOPRwiaFLMgLeTzGPTIRPaQ/9fAK00lpjY9Ng+CfqKAaNEGfAJx3UxMq/HzqQaSAGQaqm4mKMLOOSI8EKKri0Kh0KdU36mQa+IcwyaDhRuUh+IJerFKAOzksCaqp40mbKJODxCDoQXU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786976794; c=relaxed/simple; bh=g6Ybi29dgwoM6UfQYvMDQYcGW9xy0YI7ODrLkfr01x0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=TK3AT+4pV68Z9Vl+Jbc/75zQTCpSrO73BgNIIYoaC7XQFlery6FyblOnVgKNA/GTkfU10MwvQ7Q0HgWa5vhH1dGtnwSn/xO43oTAmt/7TmmLrJ8F2mXy/yD0KUFSRNgeKJvfZhf6NhTOepL44k60m0r5Q6rZZMG23LbHjSPyEEQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Q9OOt+12; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="Q9OOt+12" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2E76E1F000E9; Mon, 17 Aug 2026 14:26:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1786976793; bh=5dRuo0r1VVXd8Obpms3Of7GHwEWU8hMeGQVhC6Alqys=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=Q9OOt+12dLIFAxwENojH6irbxla7q31EmpfdDHg7mm5cMAz9GbiqcvC2WJ/VO+aNC VojhBr9g08GcubnyNOVXsV4uGe3v2Dc9dcjYd5lIWj/73mmL1l2RDxup/C83AQAK+S QYuT1wu04L9g0S/HX1PQ8TcG2CKvcw4Zq5PhpfYg= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Yuan Tan , Xin Liu , Zihan Xi , Ren Wei , Xin Long , Paolo Abeni , Sasha Levin Subject: [PATCH 5.15 057/456] sctp: fix auth_hmacs array size in struct sctp_cookie Date: Mon, 17 Aug 2026 15:27:27 +0200 Message-ID: <20260817132542.273298289@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260817132539.792407575@linuxfoundation.org> References: <20260817132539.792407575@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Xin Long [ Upstream commit e0b5252a59383b77d1b8dbeda00b7184dd95f4d3 ] The auth_hmacs array in struct sctp_cookie is supposed to store a complete SCTP_AUTH_HMAC_ALGO parameter, which consists of a struct sctp_paramhdr followed by N HMAC identifiers. However, the array size was calculated using an extra 2 bytes instead of sizeof(struct sctp_paramhdr), which is 4 bytes. When four HMAC identifiers are configured, the HMAC-ALGO parameter stored in the endpoint is larger than the auth_hmacs buffer in the cookie. As a result, sctp_association_init() copies beyond the end of auth_hmacs when initializing the association, corrupting the adjacent auth_chunks field. This can lead to an invalid HMAC identifier being accepted and later cause an out-of-bounds read in sctp_auth_get_hmac(). Fix the array size calculation by including the full SCTP parameter header size. Fixes: 1f485649f529 ("[SCTP]: Implement SCTP-AUTH internals") Reported-by: Yuan Tan Reported-by: Xin Liu Reported-by: Zihan Xi Reported-by: Ren Wei Signed-off-by: Xin Long Link: https://patch.msgid.link/634a0de0d5de29532915e6d47c92a0cbc206e03f.1783707155.git.lucien.xin@gmail.com Signed-off-by: Paolo Abeni Signed-off-by: Sasha Levin --- include/net/sctp/structs.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h index b73eadf644b3ec..c9a811a3248fb1 100644 --- a/include/net/sctp/structs.h +++ b/include/net/sctp/structs.h @@ -322,7 +322,8 @@ struct sctp_cookie { __u8 auth_random[sizeof(struct sctp_paramhdr) + SCTP_AUTH_RANDOM_LENGTH]; - __u8 auth_hmacs[SCTP_AUTH_NUM_HMACS * sizeof(__u16) + 2]; + __u8 auth_hmacs[sizeof(struct sctp_paramhdr) + + SCTP_AUTH_NUM_HMACS * sizeof(__u16)]; __u8 auth_chunks[sizeof(struct sctp_paramhdr) + SCTP_AUTH_MAX_CHUNKS]; /* This is a shim for my peer's INIT packet, followed by -- 2.53.0