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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 , Jarkko Sakkinen Subject: [PATCH v23 9/9] x86/vdso: Add ENDBR to __vdso_sgx_enter_enclave Date: Tue, 16 Mar 2021 08:13:19 -0700 Message-Id: <20210316151320.6123-10-yu-cheng.yu@intel.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20210316151320.6123-1-yu-cheng.yu@intel.com> References: <20210316151320.6123-1-yu-cheng.yu@intel.com> MIME-Version: 1.0 X-Stat-Signature: joikcpqqe7sbm1yuhkzhdu5qzhdwrikx X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 2337EE005F27 Received-SPF: none (intel.com>: No applicable sender policy available) receiver=imf21; identity=mailfrom; envelope-from=""; helo=mga01.intel.com; client-ip=192.55.52.88 X-HE-DKIM-Result: none/none X-HE-Tag: 1615907621-665228 Content-Transfer-Encoding: quoted-printable 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: ENDBR is a special new instruction for the Indirect Branch Tracking (IBT) component of CET. IBT prevents attacks by ensuring that (most) indirect branches and function calls may only land at ENDBR instructions. Branche= s that don't follow the rules will result in control flow (#CF) exceptions. ENDBR is a noop when IBT is unsupported or disabled. Most ENDBR instructions are inserted automatically by the compiler, but branch targets written in assembly must have ENDBR added manually. Add ENDBR to __vdso_sgx_enter_enclave() branch targets. Signed-off-by: Yu-cheng Yu Cc: Andy Lutomirski Cc: Borislav Petkov Cc: Dave Hansen Cc: Jarkko Sakkinen Cc: Peter Zijlstra --- arch/x86/entry/vdso/vsgx.S | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/x86/entry/vdso/vsgx.S b/arch/x86/entry/vdso/vsgx.S index 86a0e94f68df..1baa9b49053e 100644 --- a/arch/x86/entry/vdso/vsgx.S +++ b/arch/x86/entry/vdso/vsgx.S @@ -6,6 +6,7 @@ #include =20 #include "extable.h" +#include "../calling.h" =20 /* Relative to %rbp. */ #define SGX_ENCLAVE_OFFSET_OF_RUN 16 @@ -27,6 +28,7 @@ SYM_FUNC_START(__vdso_sgx_enter_enclave) /* Prolog */ .cfi_startproc + ENDBR push %rbp .cfi_adjust_cfa_offset 8 .cfi_rel_offset %rbp, 0 @@ -62,6 +64,7 @@ SYM_FUNC_START(__vdso_sgx_enter_enclave) .Lasync_exit_pointer: .Lenclu_eenter_eresume: enclu + ENDBR =20 /* EEXIT jumps here unless the enclave is doing something fancy. */ mov SGX_ENCLAVE_OFFSET_OF_RUN(%rbp), %rbx @@ -91,6 +94,7 @@ SYM_FUNC_START(__vdso_sgx_enter_enclave) jmp .Lout =20 .Lhandle_exception: + ENDBR mov SGX_ENCLAVE_OFFSET_OF_RUN(%rbp), %rbx =20 /* Set the exception info. */ --=20 2.21.0