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* [PATCH v1 0/1][UDK branches][CVE-2017-5715] Stuff RSB before RSM
@ 2018-11-16  1:37 Hao Wu
  2018-11-16  1:37 ` [PATCH v1 1/1] UefiCpuPkg: [CVE-2017-5715] " Hao Wu
  0 siblings, 1 reply; 3+ messages in thread
From: Hao Wu @ 2018-11-16  1:37 UTC (permalink / raw)
  To: edk2-devel; +Cc: Hao Wu, Jiewen Yao, Laszlo Ersek, Michael D Kinney, Eric Dong

The series aims to mitigate the Branch Target Injection (CVE-2017-5715)
issues for 'RSM' instructions. Moreover, this series focuses on the UDK
branches where .NASM file is not added for a module.

Patch 1/1 will be applied on the below UDK branches:
UDK2015

A more detailed explanation of the purpose of commit is under the
'Branch target injection mitigation' section of the below link:
https://software.intel.com/security-software-guidance/insights/host-firmware-speculative-execution-side-channel-mitigation

Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Eric Dong <eric.dong@intel.com>

Hao Wu (1):
  UefiCpuPkg: [CVE-2017-5715] Stuff RSB before RSM

 UefiCpuPkg/Include/StuffRsbAsm.inc          | 60 ++++++++++++++++++++
 UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/SmiEntry.asm |  5 +-
 UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/SmmInit.asm  |  5 +-
 UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmiEntry.asm  |  5 +-
 UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmmInit.asm   |  5 +-
 5 files changed, 76 insertions(+), 4 deletions(-)
 create mode 100644 UefiCpuPkg/Include/StuffRsbAsm.inc

-- 
2.12.0.windows.1



^ permalink raw reply	[flat|nested] 3+ messages in thread

* [PATCH v1 1/1] UefiCpuPkg: [CVE-2017-5715] Stuff RSB before RSM
  2018-11-16  1:37 [PATCH v1 0/1][UDK branches][CVE-2017-5715] Stuff RSB before RSM Hao Wu
@ 2018-11-16  1:37 ` Hao Wu
  2018-11-19  2:00   ` Dong, Eric
  0 siblings, 1 reply; 3+ messages in thread
From: Hao Wu @ 2018-11-16  1:37 UTC (permalink / raw)
  To: edk2-devel; +Cc: Hao Wu, Jiewen Yao, Laszlo Ersek, Michael D Kinney, Eric Dong

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1093

Return Stack Buffer (RSB) is used to predict the target of RET
instructions. When the RSB underflows, some processors may fall back to
using branch predictors. This might impact software using the retpoline
mitigation strategy on those processors.

This commit will add RSB stuffing logic before returning from SMM (the RSM
instruction) to avoid interfering with non-SMM usage of the retpoline
technique.

After the stuffing, RSB entries will contain a trap like:

SpecTrap:
    pause
    lfence
    jmp     SpecTrap

A more detailed explanation of the purpose of commit is under the
'Branch target injection mitigation' section of the below link:
https://software.intel.com/security-software-guidance/insights/host-firmware-speculative-execution-side-channel-mitigation

This commit introduces a .INC file that contains the RSB logic and it can
be included by .ASM files. This file is placed at directory
'UefiCpuPkg/Include/'.

Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Hao Wu <hao.a.wu@intel.com>
---
 UefiCpuPkg/Include/StuffRsbAsm.inc          | 60 ++++++++++++++++++++
 UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/SmiEntry.asm |  5 +-
 UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/SmmInit.asm  |  5 +-
 UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmiEntry.asm  |  5 +-
 UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmmInit.asm   |  5 +-
 5 files changed, 76 insertions(+), 4 deletions(-)

diff --git a/UefiCpuPkg/Include/StuffRsbAsm.inc b/UefiCpuPkg/Include/StuffRsbAsm.inc
new file mode 100644
index 0000000000..daaaaf36ad
--- /dev/null
+++ b/UefiCpuPkg/Include/StuffRsbAsm.inc
@@ -0,0 +1,60 @@
+;------------------------------------------------------------------------------ ;
+; Copyright (c) 2018, Intel Corporation. All rights reserved.<BR>
+; This program and the accompanying materials
+; are licensed and made available under the terms and conditions of the BSD License
+; which accompanies this distribution.  The full text of the license may be found at
+; http://opensource.org/licenses/bsd-license.php.
+;
+; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+;
+; Module Name:
+;
+;   StuffRsbAsm.inc
+;
+; Abstract:
+;
+;   This file provides macro definitions for stuffing the Return Stack Buffer (RSB)
+;   for .ASM files.
+;
+;-------------------------------------------------------------------------------
+
+RSB_STUFF_ENTRIES    Equ    20h
+
+;
+; parameters:
+; @param 1: register to use as counter (e.g. IA32:eax, X64:rax)
+; @param 2: stack pointer to restore   (IA32:esp, X64:rsp)
+; @param 3: the size of a stack frame  (IA32:4, X64:8)
+;
+StuffRsb     MACRO   Reg, StackPointer, Size
+             local   Unroll1, Unroll2, SpecTrap1, SpecTrap2, StuffLoop
+             mov     Reg, RSB_STUFF_ENTRIES / 2
+Unroll1:
+             call    Unroll2
+SpecTrap1:
+             pause
+             lfence
+             jmp     SpecTrap1
+Unroll2:
+             call    StuffLoop
+SpecTrap2:
+             pause
+             lfence
+             jmp     SpecTrap2
+StuffLoop:
+             dec     Reg
+             jnz     Unroll1
+             add     StackPointer, RSB_STUFF_ENTRIES * Size ; Restore the stack pointer
+             ENDM
+
+;
+; RSB stuffing macros for IA32 and X64
+;
+StuffRsb32   MACRO
+             StuffRsb    eax, esp, 4
+             ENDM
+
+StuffRsb64   MACRO
+             StuffRsb    rax, rsp, 8
+             ENDM
diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/SmiEntry.asm b/UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/SmiEntry.asm
index ac1a9b48dd..ea906d6434 100644
--- a/UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/SmiEntry.asm
+++ b/UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/SmiEntry.asm
@@ -1,5 +1,5 @@
 ;------------------------------------------------------------------------------ ;
-; Copyright (c) 2009 - 2015, Intel Corporation. All rights reserved.<BR>
+; Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>
 ; This program and the accompanying materials
 ; are licensed and made available under the terms and conditions of the BSD License
 ; which accompanies this distribution.  The full text of the license may be found at
@@ -22,6 +22,8 @@
     .model  flat,C
     .xmm
 
+INCLUDE    StuffRsbAsm.inc
+
 DSC_OFFSET    EQU     0fb00h
 DSC_GDTPTR    EQU     30h
 DSC_GDTSIZ    EQU     38h
@@ -169,6 +171,7 @@ _SmiHandler PROC
     call    eax
     pop     ecx
 
+    StuffRsb32
     rsm
 _SmiHandler ENDP
 
diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/SmmInit.asm b/UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/SmmInit.asm
index 9ba2aebe69..a606bde749 100644
--- a/UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/SmmInit.asm
+++ b/UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/SmmInit.asm
@@ -1,5 +1,5 @@
 ;------------------------------------------------------------------------------ ;
-; Copyright (c) 2009 - 2015, Intel Corporation. All rights reserved.<BR>
+; Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>
 ; This program and the accompanying materials
 ; are licensed and made available under the terms and conditions of the BSD License
 ; which accompanies this distribution.  The full text of the license may be found at
@@ -22,6 +22,8 @@
     .xmm
     .model  flat,C
 
+INCLUDE    StuffRsbAsm.inc
+
 SmmInitHandler  PROTO   C
 
 EXTERNDEF   C   gSmmCr0:DWORD
@@ -70,6 +72,7 @@ gSmmJmpAddr LABEL   QWORD
     DB      0bch                        ; mov esp, imm32
 gSmmInitStack  DD ?
     call    SmmInitHandler
+    StuffRsb32
     rsm
 SmmStartup  ENDP
 
diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmiEntry.asm b/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmiEntry.asm
index 094cf2c3da..a4063cb0dc 100644
--- a/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmiEntry.asm
+++ b/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmiEntry.asm
@@ -1,5 +1,5 @@
 ;------------------------------------------------------------------------------ ;
-; Copyright (c) 2009 - 2015, Intel Corporation. All rights reserved.<BR>
+; Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>
 ; This program and the accompanying materials
 ; are licensed and made available under the terms and conditions of the BSD License
 ; which accompanies this distribution.  The full text of the license may be found at
@@ -18,6 +18,8 @@
 ;
 ;-------------------------------------------------------------------------------
 
+INCLUDE    StuffRsbAsm.inc
+
 ;
 ; Variables referenced by C code
 ;
@@ -189,6 +191,7 @@ _SmiHandler:
     DB      48h                         ; FXRSTOR64
     fxrstor [rsp]
 
+    StuffRsb64
     rsm
 
 gcSmiHandlerSize    DW      $ - _SmiEntryPoint
diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmmInit.asm b/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmmInit.asm
index 9182f0293a..2301a208d6 100644
--- a/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmmInit.asm
+++ b/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmmInit.asm
@@ -1,5 +1,5 @@
 ;------------------------------------------------------------------------------ ;
-; Copyright (c) 2009 - 2015, Intel Corporation. All rights reserved.<BR>
+; Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>
 ; This program and the accompanying materials
 ; are licensed and made available under the terms and conditions of the BSD License
 ; which accompanies this distribution.  The full text of the license may be found at
@@ -18,6 +18,8 @@
 ;
 ;-------------------------------------------------------------------------------
 
+INCLUDE    StuffRsbAsm.inc
+
 EXTERNDEF   SmmInitHandler:PROC
 EXTERNDEF   gSmmCr0:DWORD
 EXTERNDEF   gSmmCr3:DWORD
@@ -88,6 +90,7 @@ gSmmInitStack   DQ      ?
     movdqa  xmm4, [rsp + 40h]
     movdqa  xmm5, [rsp + 50h]
 
+    StuffRsb64
     rsm
 SmmStartup  ENDP
 
-- 
2.12.0.windows.1



^ permalink raw reply related	[flat|nested] 3+ messages in thread

* Re: [PATCH v1 1/1] UefiCpuPkg: [CVE-2017-5715] Stuff RSB before RSM
  2018-11-16  1:37 ` [PATCH v1 1/1] UefiCpuPkg: [CVE-2017-5715] " Hao Wu
@ 2018-11-19  2:00   ` Dong, Eric
  0 siblings, 0 replies; 3+ messages in thread
From: Dong, Eric @ 2018-11-19  2:00 UTC (permalink / raw)
  To: Wu, Hao A, edk2-devel@lists.01.org
  Cc: Yao, Jiewen, Laszlo Ersek, Kinney, Michael D

Reviewed-by: Eric Dong <eric.dong@intel.com>

> -----Original Message-----
> From: Wu, Hao A
> Sent: Friday, November 16, 2018 9:37 AM
> To: edk2-devel@lists.01.org
> Cc: Wu, Hao A <hao.a.wu@intel.com>; Yao, Jiewen <jiewen.yao@intel.com>;
> Laszlo Ersek <lersek@redhat.com>; Kinney, Michael D
> <michael.d.kinney@intel.com>; Dong, Eric <eric.dong@intel.com>
> Subject: [PATCH v1 1/1] UefiCpuPkg: [CVE-2017-5715] Stuff RSB before RSM
> 
> REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1093
> 
> Return Stack Buffer (RSB) is used to predict the target of RET
> instructions. When the RSB underflows, some processors may fall back to
> using branch predictors. This might impact software using the retpoline
> mitigation strategy on those processors.
> 
> This commit will add RSB stuffing logic before returning from SMM (the RSM
> instruction) to avoid interfering with non-SMM usage of the retpoline
> technique.
> 
> After the stuffing, RSB entries will contain a trap like:
> 
> SpecTrap:
>     pause
>     lfence
>     jmp     SpecTrap
> 
> A more detailed explanation of the purpose of commit is under the
> 'Branch target injection mitigation' section of the below link:
> https://software.intel.com/security-software-guidance/insights/host-
> firmware-speculative-execution-side-channel-mitigation
> 
> This commit introduces a .INC file that contains the RSB logic and it can
> be included by .ASM files. This file is placed at directory
> 'UefiCpuPkg/Include/'.
> 
> Cc: Jiewen Yao <jiewen.yao@intel.com>
> Cc: Laszlo Ersek <lersek@redhat.com>
> Cc: Michael D Kinney <michael.d.kinney@intel.com>
> Cc: Eric Dong <eric.dong@intel.com>
> Contributed-under: TianoCore Contribution Agreement 1.1
> Signed-off-by: Hao Wu <hao.a.wu@intel.com>
> ---
>  UefiCpuPkg/Include/StuffRsbAsm.inc          | 60 ++++++++++++++++++++
>  UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/SmiEntry.asm |  5 +-
>  UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/SmmInit.asm  |  5 +-
>  UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmiEntry.asm  |  5 +-
>  UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmmInit.asm   |  5 +-
>  5 files changed, 76 insertions(+), 4 deletions(-)
> 
> diff --git a/UefiCpuPkg/Include/StuffRsbAsm.inc
> b/UefiCpuPkg/Include/StuffRsbAsm.inc
> new file mode 100644
> index 0000000000..daaaaf36ad
> --- /dev/null
> +++ b/UefiCpuPkg/Include/StuffRsbAsm.inc
> @@ -0,0 +1,60 @@
> +;------------------------------------------------------------------------------ ;
> +; Copyright (c) 2018, Intel Corporation. All rights reserved.<BR>
> +; This program and the accompanying materials
> +; are licensed and made available under the terms and conditions of the BSD
> License
> +; which accompanies this distribution.  The full text of the license may be
> found at
> +; http://opensource.org/licenses/bsd-license.php.
> +;
> +; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS"
> BASIS,
> +; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER
> EXPRESS OR IMPLIED.
> +;
> +; Module Name:
> +;
> +;   StuffRsbAsm.inc
> +;
> +; Abstract:
> +;
> +;   This file provides macro definitions for stuffing the Return Stack Buffer
> (RSB)
> +;   for .ASM files.
> +;
> +;-------------------------------------------------------------------------------
> +
> +RSB_STUFF_ENTRIES    Equ    20h
> +
> +;
> +; parameters:
> +; @param 1: register to use as counter (e.g. IA32:eax, X64:rax)
> +; @param 2: stack pointer to restore   (IA32:esp, X64:rsp)
> +; @param 3: the size of a stack frame  (IA32:4, X64:8)
> +;
> +StuffRsb     MACRO   Reg, StackPointer, Size
> +             local   Unroll1, Unroll2, SpecTrap1, SpecTrap2, StuffLoop
> +             mov     Reg, RSB_STUFF_ENTRIES / 2
> +Unroll1:
> +             call    Unroll2
> +SpecTrap1:
> +             pause
> +             lfence
> +             jmp     SpecTrap1
> +Unroll2:
> +             call    StuffLoop
> +SpecTrap2:
> +             pause
> +             lfence
> +             jmp     SpecTrap2
> +StuffLoop:
> +             dec     Reg
> +             jnz     Unroll1
> +             add     StackPointer, RSB_STUFF_ENTRIES * Size ; Restore the stack
> pointer
> +             ENDM
> +
> +;
> +; RSB stuffing macros for IA32 and X64
> +;
> +StuffRsb32   MACRO
> +             StuffRsb    eax, esp, 4
> +             ENDM
> +
> +StuffRsb64   MACRO
> +             StuffRsb    rax, rsp, 8
> +             ENDM
> diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/SmiEntry.asm
> b/UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/SmiEntry.asm
> index ac1a9b48dd..ea906d6434 100644
> --- a/UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/SmiEntry.asm
> +++ b/UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/SmiEntry.asm
> @@ -1,5 +1,5 @@
>  ;------------------------------------------------------------------------------ ;
> -; Copyright (c) 2009 - 2015, Intel Corporation. All rights reserved.<BR>
> +; Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>
>  ; This program and the accompanying materials
>  ; are licensed and made available under the terms and conditions of the BSD
> License
>  ; which accompanies this distribution.  The full text of the license may be
> found at
> @@ -22,6 +22,8 @@
>      .model  flat,C
>      .xmm
> 
> +INCLUDE    StuffRsbAsm.inc
> +
>  DSC_OFFSET    EQU     0fb00h
>  DSC_GDTPTR    EQU     30h
>  DSC_GDTSIZ    EQU     38h
> @@ -169,6 +171,7 @@ _SmiHandler PROC
>      call    eax
>      pop     ecx
> 
> +    StuffRsb32
>      rsm
>  _SmiHandler ENDP
> 
> diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/SmmInit.asm
> b/UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/SmmInit.asm
> index 9ba2aebe69..a606bde749 100644
> --- a/UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/SmmInit.asm
> +++ b/UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/SmmInit.asm
> @@ -1,5 +1,5 @@
>  ;------------------------------------------------------------------------------ ;
> -; Copyright (c) 2009 - 2015, Intel Corporation. All rights reserved.<BR>
> +; Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>
>  ; This program and the accompanying materials
>  ; are licensed and made available under the terms and conditions of the BSD
> License
>  ; which accompanies this distribution.  The full text of the license may be
> found at
> @@ -22,6 +22,8 @@
>      .xmm
>      .model  flat,C
> 
> +INCLUDE    StuffRsbAsm.inc
> +
>  SmmInitHandler  PROTO   C
> 
>  EXTERNDEF   C   gSmmCr0:DWORD
> @@ -70,6 +72,7 @@ gSmmJmpAddr LABEL   QWORD
>      DB      0bch                        ; mov esp, imm32
>  gSmmInitStack  DD ?
>      call    SmmInitHandler
> +    StuffRsb32
>      rsm
>  SmmStartup  ENDP
> 
> diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmiEntry.asm
> b/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmiEntry.asm
> index 094cf2c3da..a4063cb0dc 100644
> --- a/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmiEntry.asm
> +++ b/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmiEntry.asm
> @@ -1,5 +1,5 @@
>  ;------------------------------------------------------------------------------ ;
> -; Copyright (c) 2009 - 2015, Intel Corporation. All rights reserved.<BR>
> +; Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>
>  ; This program and the accompanying materials
>  ; are licensed and made available under the terms and conditions of the BSD
> License
>  ; which accompanies this distribution.  The full text of the license may be
> found at
> @@ -18,6 +18,8 @@
>  ;
>  ;-------------------------------------------------------------------------------
> 
> +INCLUDE    StuffRsbAsm.inc
> +
>  ;
>  ; Variables referenced by C code
>  ;
> @@ -189,6 +191,7 @@ _SmiHandler:
>      DB      48h                         ; FXRSTOR64
>      fxrstor [rsp]
> 
> +    StuffRsb64
>      rsm
> 
>  gcSmiHandlerSize    DW      $ - _SmiEntryPoint
> diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmmInit.asm
> b/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmmInit.asm
> index 9182f0293a..2301a208d6 100644
> --- a/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmmInit.asm
> +++ b/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmmInit.asm
> @@ -1,5 +1,5 @@
>  ;------------------------------------------------------------------------------ ;
> -; Copyright (c) 2009 - 2015, Intel Corporation. All rights reserved.<BR>
> +; Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>
>  ; This program and the accompanying materials
>  ; are licensed and made available under the terms and conditions of the BSD
> License
>  ; which accompanies this distribution.  The full text of the license may be
> found at
> @@ -18,6 +18,8 @@
>  ;
>  ;-------------------------------------------------------------------------------
> 
> +INCLUDE    StuffRsbAsm.inc
> +
>  EXTERNDEF   SmmInitHandler:PROC
>  EXTERNDEF   gSmmCr0:DWORD
>  EXTERNDEF   gSmmCr3:DWORD
> @@ -88,6 +90,7 @@ gSmmInitStack   DQ      ?
>      movdqa  xmm4, [rsp + 40h]
>      movdqa  xmm5, [rsp + 50h]
> 
> +    StuffRsb64
>      rsm
>  SmmStartup  ENDP
> 
> --
> 2.12.0.windows.1



^ permalink raw reply	[flat|nested] 3+ messages in thread

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2018-11-19  2:00   ` Dong, Eric

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