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=1794061742; b=QDJmWVdCKZ/pfFFE2bVJ1gC4l0YF1dLyCjcHaZ5qRcH5ukzR9iVwl9IZkECuAdUxudMJ YL/iVGRnbnOY0JAX5Wmbfy4Fl4ihnr+r0gkyfi/y+BHAzP7j8zhrJHK0FHjyls1Y0YATi zwiP9XDlawot98CvmTMJrks4qz52M+hO/TDJ0lC6Fl3JJqqMzcevWp5oy8AMnwDsDYdgh 7hOjccFF+aqS9+SrpI/nXaYWe2Qpb4jPagDg28FJlZRMQ4Gv8x50FeOHy1lyQ1CUPLPLI WNJO3fizd1WY44/WHwlEKy2aRwMe9advEYtZtk9G3Zl8l1JWZhgonMgKBMZ3Zco27gg== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794061742; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:User-Agent:X-stable:X-Patchwork-Hint: MIME-Version:Content-Type:Content-Transfer-Encoding; bh=s6yGTVRqdEFp0W0vs24ekBrICiHKQfIlC6sYTU3JFLs=; b=apjxCg1qoO94E9pcvVEV7JIX2irYTby6fvws36iurg+/tIpF7O14QLq8v1zTkUaRnUB7 HkjRZQAJsKGzgilYxo/jGzQ+3Ur4PF48oiRZVzwtpBF8qwr7cA5oh8qZN+h5wbtrMxIAM fwD/QMRWmkf5xrFIZdX/ZvdILjD3QG1TDfqcKCOeCZBa48gn6JyblR8Eu0HWajLQJHF6V vKkWnaMIsOapopsNT4KKXIsNtlhbGBFUV4N364hLGAZEHbs1u48TZBiOqFOSNHzdSvSr3 Eyx0BAT4RU8HqU/t+S7k8B6fjUVjB982+VLWoQE+4IIZZDfigHpJMSRSAxPXK5WV/FQ== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=VvZ+nJsq; 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 A7F31606A326; Sat, 7 Nov 2026 14:29:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=VvZ+nJsq Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4D56C1F0089F; Sat, 7 Nov 2026 14:29:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1794061741; bh=s6yGTVRqdEFp0W0vs24ekBrICiHKQfIlC6sYTU3JFLs=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=VvZ+nJsqnSTCD0eqh9IucYq7rLQH33IjqwMW7BaavWjmeBLJOXy6hu4ut7YeAx9Yp JXqPhUB0/HDLSPPVuc+eXyPXqm6IB3DL661WifbnU9P2Nu4Pcyc8nwb20rSvo7SlsO IvJb4MdYZAQhZQb+yN9pI2q34Xm68/7/C+cr1jNY= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, =?UTF-8?q?J=C3=A9r=C3=A9my=20Jean?= , Chuck Lever Subject: [PATCH 6.12 0781/1536] SUNRPC: fix oversized GSS proxy token copy Date: Sat, 7 Nov 2026 08:46:37 -0500 Message-ID: <20261107135019.474443249@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261107134957.653319350@linuxfoundation.org> References: <20261107134957.653319350@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore 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 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jérémy Jean commit 62319c2534b603b416fa2aa2f3ef18c311f75010 upstream. 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 Signed-off-by: Greg Kroah-Hartman --- net/sunrpc/auth_gss/svcauth_gss.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) --- a/net/sunrpc/auth_gss/svcauth_gss.c +++ b/net/sunrpc/auth_gss/svcauth_gss.c @@ -1085,10 +1085,11 @@ static int gss_read_proxy_verf(struct sv } length = min_t(unsigned int, inlen, (char *)xdr->end - (char *)xdr->p); - if (length) - memcpy(page_address(in_token->pages[0]), xdr->p, length); + for (to_offs = 0; to_offs < length; to_offs += PAGE_SIZE) + memcpy(page_address(in_token->pages[to_offs >> PAGE_SHIFT]), + (char *)xdr->p + 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) {