From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793971437; b=gNw5KOx1Ehnw73IniwnJlOu06BUPVwvAjqhGDmUbRdDDs1wZrpTa1a7x2KTc/Ykx7eIc 5bGWkTXTmonseuTYyv/lqHF+dAva89OGKuQ5iGtk9pAJWtPMDN4SwswnTiecWsMTEIJ71 0QGzDK178LJLS3w8IaX5cZHZVrq+Hi2KhLim2WWpxj+qNGMFRNKEjeQnP3IYqoMsZguJj fpr/X9R3BVWm+lZKlm9gMnK1bNF9xaVsVaFSw10ybn20tRrSBI9XVirdUNicVayDKxCnS grvIIojPEDurKLHz2TxCRAAtPk+Cmpg/ldwq7FR5R4yplcRD1p9d5mO/HQE1t+OS/0w== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793971437; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:MIME-Version:Content-Type: Content-Transfer-Encoding; bh=yT1MMikX41hpCPzVOrm6lII/X4LsjhWGt6txQHra6u4=; b=WseTAcHpY7KY6tIPEvkyorEKEsGL4K8csrjQQUkC+y11AfiQR/qOMHQUNv/hgqVmQodV 2TEGa9Lj/k0G7IqXaD5CKDHXPVzo2YitDwNBFoHHNuoNysdqCCSkCwAqu+iHcwNOn7egA Q3NNb0qtOrKyasN1wgsGp0HBmPOaH67TkyP98IxJxbtxCrQpoY/AYlvl5kiWk5xMST0R5 xZDXHumo/wX3HWTYGxILaIdoOBQsR0R4DSa2xBfbMjmwQTb7GiSLI4TMlrnulxuVqQ598 9+pL/49qmcKDvgt53w5FIgKR3crfqjNOoClXAW3SS75EnT7Bfz+yMu/Tvf4gaEIx76Q== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=CWtVLB6G; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3E76D606A331 for ; Fri, 6 Nov 2026 13:23:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=CWtVLB6G Received: by smtp.kernel.org (Postfix) with ESMTPSA id 59CA81F008A6; Fri, 6 Nov 2026 13:23:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793971436; bh=yT1MMikX41hpCPzVOrm6lII/X4LsjhWGt6txQHra6u4=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=CWtVLB6GVA5rYU4excEXjtqR3qkAThErMr65JqifMcIWFgqfTje2+LswWN/kgAgJw mBbTc2VObxpIwqQfKuSgXxBHRCuldj2DT4DoQtgyY2Ypdj0zg58ZE0kpihJhdaZ3Tk MNxv5WI5kBotxuqzZLbcCrppAo1kKNLeL4hBFypp37T43UEB7C3SMnAcmqiPmPL/0O AgypNfyGDwI4ZuiJcGUYuAei3ftf4O9gBKGzi+lUo/Ia0rA7BzGO9ig1HvNoaaUeiR VTOuHAdy8V9VFrOg2XVPlCTeaQxhy/LQq0YmYxGPTJ6Rt4p4jOVWL3ZtEYm/TCv1AA f4sJyjabnwXUw== From: Sasha Levin To: stable@vger.kernel.org Cc: =?UTF-8?q?J=C3=A9r=C3=A9my=20Jean?= , Chuck Lever , Sasha Levin Subject: [PATCH 5.15.y] SUNRPC: fix oversized GSS proxy token copy Date: Fri, 6 Nov 2026 08:23:55 -0500 Message-ID: <20261106132301.15748-1-sashal@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <2026110400-mop-submersed-f16f@gregkh> References: <2026110400-mop-submersed-f16f@gregkh> X-Mailing-List: stable@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Jérémy Jean [ Upstream commit 62319c2534b603b416fa2aa2f3ef18c311f75010 ] gss_read_proxy_verf() allocates one page per token chunk, but it copies the entire linear head of an RPC request into in_token->pages[0]. A UDP datagram can leave more than PAGE_SIZE bytes in the linear head, so a large RPCSEC_GSS INIT token overwrites following pages. Copy the linear head in page-sized chunks before switching to the request page array. The linear head itself can span multiple pages. Fixes: 5866efa8cbfb ("SUNRPC: Fix svcauth_gss_proxy_init()") Cc: stable@vger.kernel.org Signed-off-by: Jérémy Jean Assisted-by: Codex:gpt-5 Link: https://patch.msgid.link/20260910125120.3798995-1-Jeremy.Jean@oss.cyber.gouv.fr Signed-off-by: Chuck Lever [ sashal: adapted xdr stream pointer and length access to argv->iov_base and argv->iov_len ] Signed-off-by: Sasha Levin --- net/sunrpc/auth_gss/svcauth_gss.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/net/sunrpc/auth_gss/svcauth_gss.c b/net/sunrpc/auth_gss/svcauth_gss.c index 8beca18863907..0468b9f0163fb 100644 --- a/net/sunrpc/auth_gss/svcauth_gss.c +++ b/net/sunrpc/auth_gss/svcauth_gss.c @@ -1185,10 +1185,11 @@ static int gss_read_proxy_verf(struct svc_rqst *rqstp, } length = min_t(unsigned int, inlen, argv->iov_len); - if (length) - memcpy(page_address(in_token->pages[0]), argv->iov_base, length); + for (to_offs = 0; to_offs < length; to_offs += PAGE_SIZE) + memcpy(page_address(in_token->pages[to_offs >> PAGE_SHIFT]), + (char *)argv->iov_base + to_offs, + min_t(unsigned int, length - to_offs, PAGE_SIZE)); inlen -= length; - to_offs = length; from_offs = rqstp->rq_arg.page_base; while (inlen) { -- 2.53.0