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Date: Mon, 24 Aug 2020 17:26:44 -0700 From: Yu-cheng Yu <yu-cheng.yu@...el.com> To: x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org, linux-mm@...ck.org, linux-arch@...r.kernel.org, linux-api@...r.kernel.org, Arnd Bergmann <arnd@...db.de>, Andy Lutomirski <luto@...nel.org>, Balbir Singh <bsingharora@...il.com>, Borislav Petkov <bp@...en8.de>, Cyrill Gorcunov <gorcunov@...il.com>, Dave Hansen <dave.hansen@...ux.intel.com>, Eugene Syromiatnikov <esyr@...hat.com>, Florian Weimer <fweimer@...hat.com>, "H.J. Lu" <hjl.tools@...il.com>, Jann Horn <jannh@...gle.com>, Jonathan Corbet <corbet@....net>, Kees Cook <keescook@...omium.org>, Mike Kravetz <mike.kravetz@...cle.com>, Nadav Amit <nadav.amit@...il.com>, Oleg Nesterov <oleg@...hat.com>, Pavel Machek <pavel@....cz>, Peter Zijlstra <peterz@...radead.org>, Randy Dunlap <rdunlap@...radead.org>, "Ravi V. Shankar" <ravi.v.shankar@...el.com>, Vedvyas Shanbhogue <vedvyas.shanbhogue@...el.com>, Dave Martin <Dave.Martin@....com>, Weijiang Yang <weijiang.yang@...el.com> Cc: Yu-cheng Yu <yu-cheng.yu@...el.com> Subject: [PATCH v11 9/9] x86: Disallow vsyscall emulation when CET is enabled From: "H.J. Lu" <hjl.tools@...il.com> Emulation of the legacy vsyscall page is required by some programs built before 2013. Newer programs after 2013 don't use it. Disallow vsyscall emulation when Control-flow Enforcement (CET) is enabled to enhance security. Signed-off-by: H.J. Lu <hjl.tools@...il.com> Signed-off-by: Yu-cheng Yu <yu-cheng.yu@...el.com> --- arch/x86/Kconfig | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 5bd6d6a10047..bbc68ecfae2b 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1210,7 +1210,7 @@ config X86_ESPFIX64 config X86_VSYSCALL_EMULATION bool "Enable vsyscall emulation" if EXPERT default y - depends on X86_64 + depends on X86_64 && !X86_INTEL_CET help This enables emulation of the legacy vsyscall page. Disabling it is roughly equivalent to booting with vsyscall=none, except @@ -1225,6 +1225,8 @@ config X86_VSYSCALL_EMULATION Disabling this option saves about 7K of kernel size and possibly 4K of additional runtime pagetable memory. + This option is disabled when Intel CET is enabled. + config X86_IOPL_IOPERM bool "IOPERM and IOPL Emulation" default y @@ -2361,7 +2363,7 @@ config COMPAT_VDSO choice prompt "vsyscall table for legacy applications" - depends on X86_64 + depends on X86_64 && !X86_INTEL_CET default LEGACY_VSYSCALL_XONLY help Legacy user code that does not know how to find the vDSO expects @@ -2378,6 +2380,8 @@ choice If unsure, select "Emulate execution only". + This option is not enabled when Intel CET is enabled. + config LEGACY_VSYSCALL_EMULATE bool "Full emulation" help -- 2.21.0
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