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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E16CDC00140 for ; Mon, 15 Aug 2022 20:17:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241913AbiHOURv (ORCPT ); Mon, 15 Aug 2022 16:17:51 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33324 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1347013AbiHOUMq (ORCPT ); Mon, 15 Aug 2022 16:12:46 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 14A2289934; Mon, 15 Aug 2022 11:58:46 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 7AAAEB810A2; Mon, 15 Aug 2022 18:58:44 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D3349C433D7; Mon, 15 Aug 2022 18:58:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1660589923; bh=qFEqlYR364zAMF8tGKZfx7jNJoYRaN3R5KeD+djXNmA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PENRnJYZmvBDnx18ONxylWX75ngg04y8xxyg4dj/P8fETtMFR5Pj8RGUHRiyExz0S 9fpdRwt8jHJKsZDg5ZbVWdy/pI2VN2w550lfCgpXY0mfWb/QW+VqEjqLASIPdFHqrQ 9tvYc1UGn5q0bGN+1OmehnR9oUOf7hdstBm5CHNI= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Johannes Berg , Anton Ivanov , "Jason A. Donenfeld" Subject: [PATCH 5.18 0091/1095] um: seed rng using host OS rng Date: Mon, 15 Aug 2022 19:51:30 +0200 Message-Id: <20220815180433.291146539@linuxfoundation.org> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20220815180429.240518113@linuxfoundation.org> References: <20220815180429.240518113@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Jason A. Donenfeld commit 0b9ba6135d7f18b82f3d8bebb55ded725ba88e0e upstream. UML generally does not provide access to special CPU instructions like RDRAND, and execution tends to be rather deterministic, with no real hardware interrupts, making good randomness really very hard, if not all together impossible. Not only is this a security eyebrow raiser, but it's also quite annoying when trying to do various pieces of UML-based automation that takes a long time to boot, if ever. Fix this by trivially calling getrandom() in the host and using that seed as "bootloader randomness", which initializes the rng immediately at UML boot. The old behavior can be restored the same way as on any other arch, by way of CONFIG_TRUST_BOOTLOADER_RANDOMNESS=n or random.trust_bootloader=0. So seen from that perspective, this just makes UML act like other archs, which is positive in its own right. Additionally, wire up arch_get_random_{int,long}() in the same way, so that reseeds can also make use of the host RNG, controllable by CONFIG_TRUST_CPU_RANDOMNESS and random.trust_cpu, per usual. Cc: stable@vger.kernel.org Acked-by: Johannes Berg Acked-By: Anton Ivanov Signed-off-by: Jason A. Donenfeld Signed-off-by: Greg Kroah-Hartman --- arch/um/include/asm/archrandom.h | 30 ++++++++++++++++++++++++++++++ arch/um/include/shared/os.h | 7 +++++++ arch/um/kernel/um_arch.c | 8 ++++++++ arch/um/os-Linux/util.c | 6 ++++++ 4 files changed, 51 insertions(+) create mode 100644 arch/um/include/asm/archrandom.h --- /dev/null +++ b/arch/um/include/asm/archrandom.h @@ -0,0 +1,30 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __ASM_UM_ARCHRANDOM_H__ +#define __ASM_UM_ARCHRANDOM_H__ + +#include + +/* This is from , but better not to #include that in a global header here. */ +ssize_t os_getrandom(void *buf, size_t len, unsigned int flags); + +static inline bool __must_check arch_get_random_long(unsigned long *v) +{ + return os_getrandom(v, sizeof(*v), 0) == sizeof(*v); +} + +static inline bool __must_check arch_get_random_int(unsigned int *v) +{ + return os_getrandom(v, sizeof(*v), 0) == sizeof(*v); +} + +static inline bool __must_check arch_get_random_seed_long(unsigned long *v) +{ + return false; +} + +static inline bool __must_check arch_get_random_seed_int(unsigned int *v) +{ + return false; +} + +#endif --- a/arch/um/include/shared/os.h +++ b/arch/um/include/shared/os.h @@ -11,6 +11,12 @@ #include #include #include +/* This is to get size_t */ +#ifndef __UM_HOST__ +#include +#else +#include +#endif #define CATCH_EINTR(expr) while ((errno = 0, ((expr) < 0)) && (errno == EINTR)) @@ -243,6 +249,7 @@ extern void stack_protections(unsigned l extern int raw(int fd); extern void setup_machinename(char *machine_out); extern void setup_hostinfo(char *buf, int len); +extern ssize_t os_getrandom(void *buf, size_t len, unsigned int flags); extern void os_dump_core(void) __attribute__ ((noreturn)); extern void um_early_printk(const char *s, unsigned int n); extern void os_fix_helper_signals(void); --- a/arch/um/kernel/um_arch.c +++ b/arch/um/kernel/um_arch.c @@ -16,6 +16,7 @@ #include #include #include +#include #include #include @@ -406,6 +407,8 @@ int __init __weak read_initrd(void) void __init setup_arch(char **cmdline_p) { + u8 rng_seed[32]; + stack_protections((unsigned long) &init_thread_info); setup_physmem(uml_physmem, uml_reserved, physmem_size, highmem); mem_total_pages(physmem_size, iomem_size, highmem); @@ -416,6 +419,11 @@ void __init setup_arch(char **cmdline_p) strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE); *cmdline_p = command_line; setup_hostinfo(host_info, sizeof host_info); + + if (os_getrandom(rng_seed, sizeof(rng_seed), 0) == sizeof(rng_seed)) { + add_bootloader_randomness(rng_seed, sizeof(rng_seed)); + memzero_explicit(rng_seed, sizeof(rng_seed)); + } } void __init check_bugs(void) --- a/arch/um/os-Linux/util.c +++ b/arch/um/os-Linux/util.c @@ -14,6 +14,7 @@ #include #include #include +#include #include #include @@ -96,6 +97,11 @@ static inline void __attribute__ ((noret exit(127); } +ssize_t os_getrandom(void *buf, size_t len, unsigned int flags) +{ + return getrandom(buf, len, flags); +} + /* * UML helper threads must not handle SIGWINCH/INT/TERM */