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Peter Anvin" , Thomas Gleixner , Ingo Molnar , linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-api@vger.kernel.org, Arnd Bergmann , Andy Lutomirski , Balbir Singh , Borislav Petkov , Cyrill Gorcunov , Dave Hansen , Eugene Syromiatnikov , Florian Weimer , "H.J. Lu" , Jann Horn , Jonathan Corbet , Kees Cook , Mike Kravetz , Nadav Amit , Oleg Nesterov , Pavel Machek , Peter Zijlstra , Randy Dunlap , "Ravi V. Shankar" , Vedvyas Shanbhogue , Dave Martin , Weijiang Yang , Pengfei Xu , Haitao Huang Cc: Yu-cheng Yu Subject: [PATCH v24 2/9] x86/cet/ibt: Add user-mode Indirect Branch Tracking support Date: Thu, 1 Apr 2021 15:13:56 -0700 Message-Id: <20210401221403.32253-3-yu-cheng.yu@intel.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20210401221403.32253-1-yu-cheng.yu@intel.com> References: <20210401221403.32253-1-yu-cheng.yu@intel.com> MIME-Version: 1.0 Received-SPF: none (intel.com>: No applicable sender policy available) receiver=imf05; identity=mailfrom; envelope-from=""; helo=mga07.intel.com; client-ip=134.134.136.100 X-HE-DKIM-Result: none/none X-HE-Tag: 1617315261-485863 Content-Transfer-Encoding: quoted-printable Received-SPF: none (intel.com>: No applicable sender policy available) receiver=imf12; identity=mailfrom; envelope-from=""; helo=smtprelay.hostedemail.com; client-ip=216.40.44.141 X-HE-DKIM-Result: none/none X-HE-Tag: 1617315261-602061 X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: C221BC0007C1 X-Stat-Signature: bf38nm94m4gbfgi3eypxct7d18635tzy Received-SPF: none (intel.com>: No applicable sender policy available) receiver=imf14; identity=mailfrom; envelope-from=""; helo=smtprelay.hostedemail.com; client-ip=216.40.44.129 X-HE-DKIM-Result: none/none X-HE-Tag: 1617315261-27755 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Introduce user-mode Indirect Branch Tracking (IBT) support. Add routines for the setup/disable of IBT. Signed-off-by: Yu-cheng Yu Cc: Kees Cook --- v24: - Move IBT routines to a separate ibt.c, update related areas accordingly= . arch/x86/include/asm/cet.h | 9 ++++++ arch/x86/kernel/Makefile | 1 + arch/x86/kernel/ibt.c | 57 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 67 insertions(+) create mode 100644 arch/x86/kernel/ibt.c diff --git a/arch/x86/include/asm/cet.h b/arch/x86/include/asm/cet.h index 26124820d46f..b3df306699b4 100644 --- a/arch/x86/include/asm/cet.h +++ b/arch/x86/include/asm/cet.h @@ -15,6 +15,7 @@ struct cet_status { unsigned long shstk_base; unsigned long shstk_size; unsigned int locked:1; + unsigned int ibt_enabled:1; }; =20 #ifdef CONFIG_X86_SHADOW_STACK @@ -41,6 +42,14 @@ static inline int shstk_check_rstor_token(bool ia32, u= nsigned long token_addr, unsigned long *new_ssp) { return 0; } #endif =20 +#ifdef CONFIG_X86_IBT +int ibt_setup(void); +void ibt_disable(void); +#else +static inline int ibt_setup(void) { return 0; } +static inline void ibt_disable(void) {} +#endif + #ifdef CONFIG_X86_CET int prctl_cet(int option, u64 arg2); #else diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile index 868cb3aac618..9653e422d0f3 100644 --- a/arch/x86/kernel/Makefile +++ b/arch/x86/kernel/Makefile @@ -152,6 +152,7 @@ obj-$(CONFIG_UNWINDER_GUESS) +=3D unwind_guess.o obj-$(CONFIG_AMD_MEM_ENCRYPT) +=3D sev-es.o obj-$(CONFIG_X86_SHADOW_STACK) +=3D shstk.o obj-$(CONFIG_X86_CET) +=3D cet_prctl.o +obj-$(CONFIG_X86_IBT) +=3D ibt.o =20 ### # 64 bit specific files diff --git a/arch/x86/kernel/ibt.c b/arch/x86/kernel/ibt.c new file mode 100644 index 000000000000..d2cef1a0345b --- /dev/null +++ b/arch/x86/kernel/ibt.c @@ -0,0 +1,57 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * ibt.c - Intel Indirect Branch Tracking support + * + * Copyright (c) 2021, Intel Corporation. + * Yu-cheng Yu + */ + +#include +#include +#include +#include +#include +#include + +static void start_update_msrs(void) +{ + fpregs_lock(); + if (test_thread_flag(TIF_NEED_FPU_LOAD)) + __fpregs_load_activate(); +} + +static void end_update_msrs(void) +{ + fpregs_unlock(); +} + +int ibt_setup(void) +{ + u64 msr_val; + + if (!cpu_feature_enabled(X86_FEATURE_IBT)) + return -EOPNOTSUPP; + + start_update_msrs(); + rdmsrl(MSR_IA32_U_CET, msr_val); + msr_val |=3D (CET_ENDBR_EN | CET_NO_TRACK_EN); + wrmsrl(MSR_IA32_U_CET, msr_val); + end_update_msrs(); + current->thread.cet.ibt_enabled =3D 1; + return 0; +} + +void ibt_disable(void) +{ + u64 msr_val; + + if (!cpu_feature_enabled(X86_FEATURE_IBT)) + return; + + start_update_msrs(); + rdmsrl(MSR_IA32_U_CET, msr_val); + msr_val &=3D ~CET_ENDBR_EN; + wrmsrl(MSR_IA32_U_CET, msr_val); + end_update_msrs(); + current->thread.cet.ibt_enabled =3D 0; +} --=20 2.21.0