From: Yu-cheng Yu <yu-cheng.yu@intel.com>
To: x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
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 <arnd@arndb.de>,
Andy Lutomirski <luto@kernel.org>,
Balbir Singh <bsingharora@gmail.com>,
Borislav Petkov <bp@alien8.de>,
Cyrill Gorcunov <gorcunov@gmail.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
Eugene Syromiatnikov <esyr@redhat.com>,
Florian Weimer <fweimer@redhat.com>,
"H.J. Lu" <hjl.tools@gmail.com>, Jann Horn <jannh@google.com>,
Jonathan Corbet <corbet@lwn.net>,
Kees Cook <keescook@chromium.org>,
Mike Kravetz <mike.kravetz@oracle.com>,
Nadav Amit <nadav.amit@gmail.com>,
Oleg Nesterov <oleg@redhat.com>, Pavel Machek <pavel@ucw.cz>,
Peter Zijlstra <peterz@infradead.org>,
Randy Dunlap <rdunlap@infradead.org>,
"Ravi V. Shankar" <ravi.v.shankar@intel.com>,
Vedvyas Shanbhogue <vedvyas.shanbhogue@intel.com>,
Dave Martin <Dave.Martin@arm.com>,
Weijiang Yang <weijiang.yang@intel.com>,
Pengfei Xu <pengfei.xu@intel.com>,
Haitao Huang <haitao.huang@intel.com>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Subject: [PATCH v25 6/9] x86/vdso: Insert endbr32/endbr64 to vDSO
Date: Thu, 15 Apr 2021 15:17:31 -0700 [thread overview]
Message-ID: <20210415221734.32628-7-yu-cheng.yu@intel.com> (raw)
In-Reply-To: <20210415221734.32628-1-yu-cheng.yu@intel.com>
From: "H.J. Lu" <hjl.tools@gmail.com>
When Indirect Branch Tracking (IBT) is enabled, vDSO functions may be
called indirectly, and must have ENDBR32 or ENDBR64 as the first
instruction. The compiler must support -fcf-protection=branch so that it
can be used to compile vDSO.
Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
Signed-off-by: Yu-cheng Yu <yu-cheng.yu@intel.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Kees Cook <keescook@chromium.org>
---
v24:
- Replace CONFIG_X86_CET with CONFIG_X86_IBT to reflect splitting of shadow
stack and ibt.
arch/x86/entry/vdso/Makefile | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/x86/entry/vdso/Makefile b/arch/x86/entry/vdso/Makefile
index 05c4abc2fdfd..a773a5f03b63 100644
--- a/arch/x86/entry/vdso/Makefile
+++ b/arch/x86/entry/vdso/Makefile
@@ -93,6 +93,10 @@ endif
$(vobjs): KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_LTO) $(GCC_PLUGINS_CFLAGS) $(RETPOLINE_CFLAGS),$(KBUILD_CFLAGS)) $(CFL)
+ifdef CONFIG_X86_IBT
+$(vobjs) $(vobjs32): KBUILD_CFLAGS += -fcf-protection=branch
+endif
+
#
# vDSO code runs in userspace and -pg doesn't help with profiling anyway.
#
--
2.21.0
next prev parent reply other threads:[~2021-04-15 22:19 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-15 22:17 [PATCH v25 0/9] Control-flow Enforcement: Indirect Branch Tracking Yu-cheng Yu
2021-04-15 22:17 ` [PATCH v25 1/9] x86/cet/ibt: Add Kconfig option for " Yu-cheng Yu
2021-04-15 22:17 ` [PATCH v25 2/9] x86/cet/ibt: Add user-mode Indirect Branch Tracking support Yu-cheng Yu
2021-04-15 22:17 ` [PATCH v25 3/9] x86/cet/ibt: Handle signals for Indirect Branch Tracking Yu-cheng Yu
2021-04-15 22:17 ` [PATCH v25 4/9] x86/cet/ibt: Update ELF header parsing " Yu-cheng Yu
2021-04-15 22:17 ` [PATCH v25 5/9] x86/cet/ibt: Update arch_prctl functions " Yu-cheng Yu
2021-04-15 22:17 ` Yu-cheng Yu [this message]
2021-04-15 22:17 ` [PATCH v25 7/9] x86/vdso: Introduce ENDBR macro Yu-cheng Yu
2021-04-15 22:17 ` [PATCH v25 8/9] x86/vdso/32: Add ENDBR to __kernel_vsyscall entry point Yu-cheng Yu
2021-04-15 22:17 ` [PATCH v25 9/9] x86/vdso: Add ENDBR to __vdso_sgx_enter_enclave Yu-cheng Yu
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