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Date: Fri, 23 Dec 2016 17:37:44 -0800 From: Ricardo Neri <ricardo.neri-calderon@...ux.intel.com> To: Ingo Molnar <mingo@...hat.com>, Thomas Gleixner <tglx@...utronix.de>, Borislav Petkov <bp@...e.de>, Andy Lutomirski <luto@...nel.org>, Peter Zijlstra <peterz@...radead.org> Cc: linux-kernel@...r.kernel.org, x86@...nel.org, <linux-msdos@...r.kernel.org>, <wine-devel@...ehq.org>, Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>, Andrew Morton <akpm@...ux-foundation.org>, "H . Peter Anvin" <hpa@...or.com>, Brian Gerst <brgerst@...il.com>, Chen Yucong <slaoub@...il.com>, Chris Metcalf <cmetcalf@...lanox.com>, Dave Hansen <dave.hansen@...ux.intel.com>, Fenghua Yu <fenghua.yu@...el.com>, Huang Rui <ray.huang@....com>, Jiri Slaby <jslaby@...e.cz>, Jonathan Corbet <corbet@....net>, "Michael S . Tsirkin" <mst@...hat.com>, Paul Gortmaker <paul.gortmaker@...driver.com>, "Ravi V . Shankar" <ravi.v.shankar@...el.com>, Shuah Khan <shuah@...nel.org>, Vlastimil Babka <vbabka@...e.cz>, Tony Luck <tony.luck@...el.com>, Paolo Bonzini <pbonzini@...hat.com>, "Liang Z . Li" <liang.z.li@...el.com>, Alexandre Julliard <julliard@...ehq.org>, Stas Sergeev <stsp@...t.ru> Subject: [v2 6/7] x86/traps: Fixup general protection faults caused by UMIP If the User-Mode Instruction Prevention CPU feature is available and enabled, a general protection fault will be issued if the instructions sgdt, sldt, sidt, str or smsw are executed from user-mode context (CPL > 0). If the fault was caused by any of the instructions protected by UMIP, fixup_umip_exceptino will emulate dummy results for these instructions. Cc: Andy Lutomirski <luto@...nel.org> Cc: Andrew Morton <akpm@...ux-foundation.org> Cc: H. Peter Anvin <hpa@...or.com> Cc: Borislav Petkov <bp@...e.de> Cc: Brian Gerst <brgerst@...il.com> Cc: Chen Yucong <slaoub@...il.com> Cc: Chris Metcalf <cmetcalf@...lanox.com> Cc: Dave Hansen <dave.hansen@...ux.intel.com> Cc: Fenghua Yu <fenghua.yu@...el.com> Cc: Huang Rui <ray.huang@....com> Cc: Jiri Slaby <jslaby@...e.cz> Cc: Jonathan Corbet <corbet@....net> Cc: Michael S. Tsirkin <mst@...hat.com> Cc: Paul Gortmaker <paul.gortmaker@...driver.com> Cc: Peter Zijlstra <peterz@...radead.org> Cc: Ravi V. Shankar <ravi.v.shankar@...el.com> Cc: Shuah Khan <shuah@...nel.org> Cc: Vlastimil Babka <vbabka@...e.cz> Cc: Tony Luck <tony.luck@...el.com> Cc: Paolo Bonzini <pbonzini@...hat.com> Cc: Liang Z. Li <liang.z.li@...el.com> Cc: Alexandre Julliard <julliard@...ehq.org> Cc: Stas Sergeev <stsp@...t.ru> Cc: x86@...nel.org Cc: linux-msdos@...r.kernel.org Signed-off-by: Ricardo Neri <ricardo.neri-calderon@...ux.intel.com> --- arch/x86/kernel/traps.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c index bf0c6d0..5044fb3 100644 --- a/arch/x86/kernel/traps.c +++ b/arch/x86/kernel/traps.c @@ -64,6 +64,7 @@ #include <asm/trace/mpx.h> #include <asm/mpx.h> #include <asm/vm86.h> +#include <asm/umip.h> #ifdef CONFIG_X86_64 #include <asm/x86_init.h> @@ -491,6 +492,9 @@ do_general_protection(struct pt_regs *regs, long error_code) RCU_LOCKDEP_WARN(!rcu_is_watching(), "entry code didn't wake RCU"); cond_local_irq_enable(regs); + if (user_mode(regs) && !fixup_umip_exception(regs)) + return; + if (v8086_mode(regs)) { local_irq_enable(); handle_vm86_fault((struct kernel_vm86_regs *) regs, error_code); -- 2.9.3
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