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This patch makes general preparations to enable this feature on different supported architectures: - Added CONFIG_HAS_STACK_PROTECTOR option so each architecture can enable this feature individually - Added user-selectable CONFIG_STACK_PROTECTOR option - Implemented code that sets up random stack canary and a basic handler for stack protector failures Stack guard value is initialized in two phases: 1. Pre-defined randomly-selected value. 2. Own implementation linear congruent random number generator. It relies on get_cycles() being available very early. If get_cycles() returns zero, it would leave pre-defined value from the previous step. boot_stack_chk_guard_setup() is declared as inline, so it can be called from C code. Of course, in this case, caller should ensure that stack protection code will not be reached. It is possible to call the same function from ASM code by introducing simple trampoline in stack-protector.c, but right now there is no use case for such trampoline. Signed-off-by: Volodymyr Babchuk --- Changes in v7: - declared boot_stack_chk_guard_setup as always_inline - moved `#ifdef CONFIG_STACK_PROTECTOR` inside the function Changes in v6: - boot_stack_chk_guard_setup() moved to stack-protector.h - Removed Andrew's r-b tag Changes in v5: - Fixed indentation - Added stack-protector.h --- xen/Makefile | 4 ++++ xen/common/Kconfig | 15 ++++++++++++ xen/common/Makefile | 1 + xen/common/stack-protector.c | 21 +++++++++++++++++ xen/include/xen/stack-protector.h | 39 +++++++++++++++++++++++++++++++ 5 files changed, 80 insertions(+) create mode 100644 xen/common/stack-protector.c create mode 100644 xen/include/xen/stack-protector.h diff --git a/xen/Makefile b/xen/Makefile index 58fafab33d..8fc4e042ff 100644 --- a/xen/Makefile +++ b/xen/Makefile @@ -435,7 +435,11 @@ else CFLAGS_UBSAN := endif +ifeq ($(CONFIG_STACK_PROTECTOR),y) +CFLAGS += -fstack-protector +else CFLAGS += -fno-stack-protector +endif ifeq ($(CONFIG_LTO),y) CFLAGS += -flto diff --git a/xen/common/Kconfig b/xen/common/Kconfig index a6aa2c5c14..2f6c74f11e 100644 --- a/xen/common/Kconfig +++ b/xen/common/Kconfig @@ -83,6 +83,9 @@ config HAS_PMAP config HAS_SCHED_GRANULARITY bool +config HAS_STACK_PROTECTOR + bool + config HAS_UBSAN bool @@ -216,6 +219,18 @@ config SPECULATIVE_HARDEN_LOCK endmenu +menu "Other hardening" + +config STACK_PROTECTOR + bool "Stack protector" + depends on HAS_STACK_PROTECTOR + help + Enable the Stack Protector compiler hardening option. This inserts a + canary value in the stack frame of functions, and performs an integrity + check on function exit. + +endmenu + config DIT_DEFAULT bool "Data Independent Timing default" depends on HAS_DIT diff --git a/xen/common/Makefile b/xen/common/Makefile index ac23120d7d..92c49127c9 100644 --- a/xen/common/Makefile +++ b/xen/common/Makefile @@ -46,6 +46,7 @@ obj-y += shutdown.o obj-y += softirq.o obj-y += smp.o obj-y += spinlock.o +obj-$(CONFIG_STACK_PROTECTOR) += stack-protector.o obj-y += stop_machine.o obj-y += symbols.o obj-y += tasklet.o diff --git a/xen/common/stack-protector.c b/xen/common/stack-protector.c new file mode 100644 index 0000000000..9089294d30 --- /dev/null +++ b/xen/common/stack-protector.c @@ -0,0 +1,21 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +#include +#include +#include +#include + +/* + * Initial value is chosen by a fair dice roll. + * It will be updated during boot process. + */ +#if BITS_PER_LONG == 32 +unsigned long __ro_after_init __stack_chk_guard = 0xdd2cc927UL; +#else +unsigned long __ro_after_init __stack_chk_guard = 0x2d853605a4d9a09cUL; +#endif + +void asmlinkage __stack_chk_fail(void) +{ + dump_execution_state(); + panic("Stack Protector integrity violation identified\n"); +} diff --git a/xen/include/xen/stack-protector.h b/xen/include/xen/stack-protector.h new file mode 100644 index 0000000000..c76c601399 --- /dev/null +++ b/xen/include/xen/stack-protector.h @@ -0,0 +1,39 @@ +#ifndef __XEN_STACK_PROTECTOR_H__ +#define __XEN_STACK_PROTECTOR_H__ + +extern unsigned long __stack_chk_guard; + +/* + * This function should be called from a C function that escapes stack + * canary tracking (by calling reset_stack_and_jump() for example). + */ +static always_inline void boot_stack_chk_guard_setup(void) +{ +#ifdef CONFIG_STACK_PROTECTOR + + /* + * Linear congruent generator (X_n+1 = X_n * a + c). + * + * Constant is taken from "Tables Of Linear Congruential + * Generators Of Different Sizes And Good Lattice Structure" by + * Pierre L’Ecuyer. + */ +#if BITS_PER_LONG == 32 + const unsigned long a = 2891336453UL; +#else + const unsigned long a = 2862933555777941757UL; +#endif + const unsigned long c = 1; + + unsigned long cycles = get_cycles(); + + /* Use the initial value if we can't generate random one */ + if ( !cycles ) + return; + + __stack_chk_guard = cycles * a + c; + +#endif /* CONFIG_STACK_PROTECTOR */ +} + +#endif /* __XEN_STACK_PROTECTOR_H__ */ From patchwork Tue Mar 18 02:34:16 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Volodymyr Babchuk X-Patchwork-Id: 14020201 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 lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (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 B9CA0C35FF9 for ; Tue, 18 Mar 2025 02:34:51 +0000 (UTC) Received: from list by lists.xenproject.org with outflank-mailman.918403.1323118 (Exim 4.92) (envelope-from ) id 1tuMmm-0005OJ-Ve; 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Initialize stack protector magic value very early, at the very beginning of start_xen() function. We want to do this early because prior to that boot_stack_chk_guard_setup() call, default stack protector guard value is used. While it is fine for general development and testing, it does not provide highest security level, because potential attacker will know the default value and can alter a payload, so correct stack guard value will be placed in the correct position. Apart from that argument, boot_stack_chk_guard_setup() should be called prior to enabling secondary CPUs to avoid race with them. Signed-off-by: Volodymyr Babchuk Acked-by: Julien Grall --- Changes in v6: - Expanded the commit message - Added Julien's A-b tag Changes in v5: - Call boot_stack_chk_guard_setup() from start_xen() instead of early ASM --- xen/arch/arm/Kconfig | 1 + xen/arch/arm/setup.c | 3 +++ 2 files changed, 4 insertions(+) diff --git a/xen/arch/arm/Kconfig b/xen/arch/arm/Kconfig index ffdff1f0a3..5d6870c817 100644 --- a/xen/arch/arm/Kconfig +++ b/xen/arch/arm/Kconfig @@ -15,6 +15,7 @@ config ARM select GENERIC_UART_INIT select HAS_ALTERNATIVE if HAS_VMAP select HAS_DEVICE_TREE + select HAS_STACK_PROTECTOR select HAS_UBSAN config ARCH_DEFCONFIG diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c index ffcae900d7..fa11e6be9f 100644 --- a/xen/arch/arm/setup.c +++ b/xen/arch/arm/setup.c @@ -30,6 +30,7 @@ #include #include #include +#include #include #include #include @@ -306,6 +307,8 @@ void asmlinkage __init start_xen(unsigned long fdt_paddr) struct domain *d; int rc, i; + boot_stack_chk_guard_setup(); 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Signed-off-by: Volodymyr Babchuk Acked-by: Oleksii Kurochko --- Changes in v7: - Moved the change to v4.21 - Added Oleksii's acked-by tag Changes in v6: - Dropped Andrew's R-b tag because there is little chance that this series will be included in 4.20, so this patch should be reworked for 4.21 --- CHANGELOG.md | 2 ++ 1 file changed, 2 insertions(+) diff --git a/CHANGELOG.md b/CHANGELOG.md index 7201c484f8..9605f670f6 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -12,6 +12,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/) - On x86: - Option to attempt to fixup p2m page-faults on PVH dom0. - Resizable BARs is supported for PVH dom0. + - On Arm: + - Ability to enable stack protector ### Removed