From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id CDE00CDD552 for ; Thu, 19 Sep 2024 12:45:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=dKpH+tlU423xOURAFjrKZyJAMssXrMwBVe1nv9ITqEw=; b=z9mwbA3CD2OoG6h76FxTmZkDTG SGrBP/4+Fqot7wvPPbqHWEP8UZB2oBa4cRc25DI3CM6zm5wwAFu1MgzE59LET9jlmJVRCNWm+wIbH n9WN9+JO+ZOl61MH8TCy9DW+R2xSkx/x0b2l3M89pHCRyNvO2ykgVSO6eELCtM1BWphqFFOjIb8cP dA3APlmDZ8WBn/76V5M5pQDV7elsAUYoKgMDmKokhraTXQgr44hlhs1CNOxdTtUxuMKvSio5wIgRX h2pCK0ZdA/Wc46ck5KB2I+JGKpSG0KUIYXpQo3hmv4GW8JZKxK17HsQvehCw8EWNSG7lenuogZUq8 NXHb8ENA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1srGXb-0000000AGro-1fFL; Thu, 19 Sep 2024 12:45:47 +0000 Received: from s3.sipsolutions.net ([2a01:4f8:242:246e::2] helo=sipsolutions.net) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1srGXY-0000000AGq7-0rjQ for linux-um@lists.infradead.org; Thu, 19 Sep 2024 12:45:45 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sipsolutions.net; s=mail; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From:Content-Type:Sender :Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From:Resent-To: Resent-Cc:Resent-Message-ID; bh=dKpH+tlU423xOURAFjrKZyJAMssXrMwBVe1nv9ITqEw=; t=1726749944; x=1727959544; b=LmANmG1bZs1ZwCnVCQuo3y5KrJLeEslA+GuoN/F4IpKzWPE /D/jqLALo6kYqzP2evyYQ9hxeghCqsZuYwC74JVwzM439L+nxLnOPDNFTx1uhvAVJNNwwk+4KQIW3 MqZr+zhdfCRGhdRAfBPz3tmBHve56n7Tt6hmhIhedDGzoUbXYIfaGaN9lCMZsQJO8tNe91nnvUFS4 //hXKU8manvk3OUiEKhDmv7VOwsDiyqUpSvxou535isOCJCAj6qnqXBdmtGJtEiT3i6hOLb48MUwo 5QFFOP+VPsNdz3ipsCByLO78oN943xUZfZAB+zAgw4zRvrf+OHI35W8gsgR+1bLA==; Received: by sipsolutions.net with esmtpsa (TLS1.3:ECDHE_X25519__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim 4.97) (envelope-from ) id 1srGXW-000000047AZ-0G6r; Thu, 19 Sep 2024 14:45:42 +0200 From: Benjamin Berg To: linux-um@lists.infradead.org Cc: Benjamin Berg Subject: [PATCH v9 05/10] um: Add compile time assert that stub fits on a page Date: Thu, 19 Sep 2024 14:45:06 +0200 Message-ID: <20240919124511.282088-6-benjamin@sipsolutions.net> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240919124511.282088-1-benjamin@sipsolutions.net> References: <20240919124511.282088-1-benjamin@sipsolutions.net> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240919_054544_328815_7BC61EAD X-CRM114-Status: UNSURE ( 8.63 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-um@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-um" Errors-To: linux-um-bounces+linux-um=archiver.kernel.org@lists.infradead.org From: Benjamin Berg The code assumes that the stub code can fit into a single page. This is unlikely to ever change, but add a link time assert instead so that there will be no hard to debug error. Signed-off-by: Benjamin Berg --- arch/um/kernel/dyn.lds.S | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/um/kernel/dyn.lds.S b/arch/um/kernel/dyn.lds.S index 3385d653ebd0..dc9d9a68af55 100644 --- a/arch/um/kernel/dyn.lds.S +++ b/arch/um/kernel/dyn.lds.S @@ -178,3 +178,6 @@ SECTIONS DISCARDS } + +ASSERT(__syscall_stub_end - __syscall_stub_start <= PAGE_SIZE, + "STUB code must not be larger than one page"); -- 2.46.0