From patchwork Tue Mar 26 19:50:00 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zev Weiss X-Patchwork-Id: 1916337 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=bewilderbeest.net header.i=@bewilderbeest.net header.a=rsa-sha256 header.s=thorn header.b=I/BHBtDb; dkim-atps=neutral Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org (client-ip=2404:9400:2:0:216:3eff:fee1:b9f1; helo=lists.ozlabs.org; envelope-from=openbmc-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org; receiver=patchwork.ozlabs.org) Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2404:9400:2:0:216:3eff:fee1:b9f1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (secp384r1)) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4V40mW6pKzz1yWr for ; Wed, 27 Mar 2024 06:51:23 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=bewilderbeest.net header.i=@bewilderbeest.net header.a=rsa-sha256 header.s=thorn header.b=I/BHBtDb; dkim-atps=neutral Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4V40mW5lhyz3dwG for ; Wed, 27 Mar 2024 06:51:23 +1100 (AEDT) X-Original-To: openbmc@lists.ozlabs.org Delivered-To: openbmc@lists.ozlabs.org Authentication-Results: lists.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=bewilderbeest.net header.i=@bewilderbeest.net header.a=rsa-sha256 header.s=thorn header.b=I/BHBtDb; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=bewilderbeest.net (client-ip=2605:2700:0:5::4713:9cab; helo=thorn.bewilderbeest.net; envelope-from=zev@bewilderbeest.net; receiver=lists.ozlabs.org) Received: from thorn.bewilderbeest.net (thorn.bewilderbeest.net [IPv6:2605:2700:0:5::4713:9cab]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4V40lD4y00z30hY for ; Wed, 27 Mar 2024 06:50:16 +1100 (AEDT) Received: from hatter.bewilderbeest.net (unknown [IPv6:2602:61:712b:6300::2]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: zev) by thorn.bewilderbeest.net (Postfix) with ESMTPSA id 4012D42EC; Tue, 26 Mar 2024 12:50:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bewilderbeest.net; s=thorn; t=1711482612; bh=VXZG6nn8qlp/LBRiKMMU2fq4sMy01iM3iFcQ8cFjjb4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=I/BHBtDbpiLpjOFuQsYSRTw8kEBQdDesYYlRBGXEg3JWGYo2BV2Bxi5ZSEt3N9JlC TAjJYwjHRIJMErNwsxxCznTJe9320cdPdjQqBMPjr9LE0kYbEo66tX4wUkIUXKnnUP 5SbhqmG9oILcn3GiqzlVYtREbC1p8Heq5msx5p8A= From: Zev Weiss To: Andrew Jeffery , Joel Stanley Subject: [PATCH linux dev-6.6 2/2] ARM: prctl: Reject PR_SET_MDWE on pre-ARMv6 Date: Tue, 26 Mar 2024 12:50:00 -0700 Message-ID: <20240326194959.10777-6-zev@bewilderbeest.net> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240326194959.10777-4-zev@bewilderbeest.net> References: <20240326194959.10777-4-zev@bewilderbeest.net> MIME-Version: 1.0 X-BeenThere: openbmc@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Development list for OpenBMC List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: openbmc@lists.ozlabs.org Errors-To: openbmc-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "openbmc" On v5 and lower CPUs we can't provide MDWE protection, so ensure we fail any attempt to enable it via prctl(PR_SET_MDWE). Previously such an attempt would misleadingly succeed, leading to any subsequent mmap(PROT_READ|PROT_WRITE) or execve() failing unconditionally (the latter somewhat violently via force_fatal_sig(SIGSEGV) due to READ_IMPLIES_EXEC). Signed-off-by: Zev Weiss Cc: # v6.3+ --- arch/arm/include/asm/mman.h | 14 ++++++++++++++ 1 file changed, 14 insertions(+) create mode 100644 arch/arm/include/asm/mman.h diff --git a/arch/arm/include/asm/mman.h b/arch/arm/include/asm/mman.h new file mode 100644 index 000000000000..2189e507c8e0 --- /dev/null +++ b/arch/arm/include/asm/mman.h @@ -0,0 +1,14 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __ASM_MMAN_H__ +#define __ASM_MMAN_H__ + +#include +#include + +static inline bool arch_memory_deny_write_exec_supported(void) +{ + return cpu_architecture() >= CPU_ARCH_ARMv6; +} +#define arch_memory_deny_write_exec_supported arch_memory_deny_write_exec_supported + +#endif /* __ASM_MMAN_H__ */