From mboxrd@z Thu Jan 1 00:00:00 1970 From: Yu-cheng Yu Subject: [PATCH v8 27/27] x86/cet/shstk: Add Shadow Stack instructions to opcode map Date: Tue, 13 Aug 2019 13:52:25 -0700 Message-ID: <20190813205225.12032-28-yu-cheng.yu@intel.com> References: <20190813205225.12032-1-yu-cheng.yu@intel.com> Return-path: In-Reply-To: <20190813205225.12032-1-yu-cheng.yu@intel.com> Sender: linux-kernel-owner@vger.kernel.org To: x86@kernel.org, "H. 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 Cc: Yu-cheng Yu List-Id: linux-api@vger.kernel.org Add the following shadow stack management instructions. INCSSP: Increment shadow stack pointer by the steps specified. RDSSP: Read SSP register into a GPR. SAVEPREVSSP: Use "prev ssp" token at top of current shadow stack to create a "restore token" on previous shadow stack. RSTORSSP: Restore from a "restore token" pointed by a GPR to SSP. WRSS: Write to kernel-mode shadow stack (kernel-mode instruction). WRUSS: Write to user-mode shadow stack (kernel-mode instruction). SETSSBSY: Verify the "supervisor token" pointed by IA32_PL0_SSP MSR, if valid, set the token to busy, and set SSP to the value of IA32_PL0_SSP MSR. CLRSSBSY: Verify the "supervisor token" pointed by a GPR, if valid, clear the busy bit from the token. Signed-off-by: Yu-cheng Yu --- arch/x86/lib/x86-opcode-map.txt | 26 +++++++++++++------ tools/objtool/arch/x86/lib/x86-opcode-map.txt | 26 +++++++++++++------ 2 files changed, 36 insertions(+), 16 deletions(-) diff --git a/arch/x86/lib/x86-opcode-map.txt b/arch/x86/lib/x86-opcode-map.txt index e0b85930dd77..c5e825d44766 100644 --- a/arch/x86/lib/x86-opcode-map.txt +++ b/arch/x86/lib/x86-opcode-map.txt @@ -366,7 +366,7 @@ AVXcode: 1 1b: BNDCN Gv,Ev (F2) | BNDMOV Ev,Gv (66) | BNDMK Gv,Ev (F3) | BNDSTX Ev,Gv 1c: 1d: -1e: +1e: RDSSP Rd (F3),REX.W 1f: NOP Ev # 0x0f 0x20-0x2f 20: MOV Rd,Cd @@ -610,7 +610,17 @@ fe: paddd Pq,Qq | vpaddd Vx,Hx,Wx (66),(v1) ff: UD0 EndTable -Table: 3-byte opcode 1 (0x0f 0x38) +Table: 3-byte opcode 1 (0x0f 0x01) +Referrer: +AVXcode: +# Skip 0x00-0xe7 +e8: SETSSBSY (f3) +e9: +ea: SAVEPREVSSP (f3) +# Skip 0xeb-0xff +EndTable + +Table: 3-byte opcode 2 (0x0f 0x38) Referrer: 3-byte escape 1 AVXcode: 2 # 0x0f 0x38 0x00-0x0f @@ -789,12 +799,12 @@ f0: MOVBE Gy,My | MOVBE Gw,Mw (66) | CRC32 Gd,Eb (F2) | CRC32 Gd,Eb (66&F2) f1: MOVBE My,Gy | MOVBE Mw,Gw (66) | CRC32 Gd,Ey (F2) | CRC32 Gd,Ew (66&F2) f2: ANDN Gy,By,Ey (v) f3: Grp17 (1A) -f5: BZHI Gy,Ey,By (v) | PEXT Gy,By,Ey (F3),(v) | PDEP Gy,By,Ey (F2),(v) -f6: ADCX Gy,Ey (66) | ADOX Gy,Ey (F3) | MULX By,Gy,rDX,Ey (F2),(v) +f5: BZHI Gy,Ey,By (v) | PEXT Gy,By,Ey (F3),(v) | PDEP Gy,By,Ey (F2),(v) | WRUSS Pq,Qq (66),REX.W +f6: ADCX Gy,Ey (66) | ADOX Gy,Ey (F3) | MULX By,Gy,rDX,Ey (F2),(v) | WRSS Pq,Qq (66),REX.W f7: BEXTR Gy,Ey,By (v) | SHLX Gy,Ey,By (66),(v) | SARX Gy,Ey,By (F3),(v) | SHRX Gy,Ey,By (F2),(v) EndTable -Table: 3-byte opcode 2 (0x0f 0x3a) +Table: 3-byte opcode 3 (0x0f 0x3a) Referrer: 3-byte escape 2 AVXcode: 3 # 0x0f 0x3a 0x00-0xff @@ -948,7 +958,7 @@ GrpTable: Grp7 2: LGDT Ms | XGETBV (000),(11B) | XSETBV (001),(11B) | VMFUNC (100),(11B) | XEND (101)(11B) | XTEST (110)(11B) 3: LIDT Ms 4: SMSW Mw/Rv -5: rdpkru (110),(11B) | wrpkru (111),(11B) +5: rdpkru (110),(11B) | wrpkru (111),(11B) | RSTORSSP Mq (F3) 6: LMSW Ew 7: INVLPG Mb | SWAPGS (o64),(000),(11B) | RDTSCP (001),(11B) EndTable @@ -1019,8 +1029,8 @@ GrpTable: Grp15 2: vldmxcsr Md (v1) | WRFSBASE Ry (F3),(11B) 3: vstmxcsr Md (v1) | WRGSBASE Ry (F3),(11B) 4: XSAVE | ptwrite Ey (F3),(11B) -5: XRSTOR | lfence (11B) -6: XSAVEOPT | clwb (66) | mfence (11B) +5: XRSTOR | lfence (11B) | INCSSP Rd (F3),REX.W +6: XSAVEOPT | clwb (66) | mfence (11B) | CLRSSBSY Mq (F3) 7: clflush | clflushopt (66) | sfence (11B) EndTable diff --git a/tools/objtool/arch/x86/lib/x86-opcode-map.txt b/tools/objtool/arch/x86/lib/x86-opcode-map.txt index e0b85930dd77..c5e825d44766 100644 --- a/tools/objtool/arch/x86/lib/x86-opcode-map.txt +++ b/tools/objtool/arch/x86/lib/x86-opcode-map.txt @@ -366,7 +366,7 @@ AVXcode: 1 1b: BNDCN Gv,Ev (F2) | BNDMOV Ev,Gv (66) | BNDMK Gv,Ev (F3) | BNDSTX Ev,Gv 1c: 1d: -1e: +1e: RDSSP Rd (F3),REX.W 1f: NOP Ev # 0x0f 0x20-0x2f 20: MOV Rd,Cd @@ -610,7 +610,17 @@ fe: paddd Pq,Qq | vpaddd Vx,Hx,Wx (66),(v1) ff: UD0 EndTable -Table: 3-byte opcode 1 (0x0f 0x38) +Table: 3-byte opcode 1 (0x0f 0x01) +Referrer: +AVXcode: +# Skip 0x00-0xe7 +e8: SETSSBSY (f3) +e9: +ea: SAVEPREVSSP (f3) +# Skip 0xeb-0xff +EndTable + +Table: 3-byte opcode 2 (0x0f 0x38) Referrer: 3-byte escape 1 AVXcode: 2 # 0x0f 0x38 0x00-0x0f @@ -789,12 +799,12 @@ f0: MOVBE Gy,My | MOVBE Gw,Mw (66) | CRC32 Gd,Eb (F2) | CRC32 Gd,Eb (66&F2) f1: MOVBE My,Gy | MOVBE Mw,Gw (66) | CRC32 Gd,Ey (F2) | CRC32 Gd,Ew (66&F2) f2: ANDN Gy,By,Ey (v) f3: Grp17 (1A) -f5: BZHI Gy,Ey,By (v) | PEXT Gy,By,Ey (F3),(v) | PDEP Gy,By,Ey (F2),(v) -f6: ADCX Gy,Ey (66) | ADOX Gy,Ey (F3) | MULX By,Gy,rDX,Ey (F2),(v) +f5: BZHI Gy,Ey,By (v) | PEXT Gy,By,Ey (F3),(v) | PDEP Gy,By,Ey (F2),(v) | WRUSS Pq,Qq (66),REX.W +f6: ADCX Gy,Ey (66) | ADOX Gy,Ey (F3) | MULX By,Gy,rDX,Ey (F2),(v) | WRSS Pq,Qq (66),REX.W f7: BEXTR Gy,Ey,By (v) | SHLX Gy,Ey,By (66),(v) | SARX Gy,Ey,By (F3),(v) | SHRX Gy,Ey,By (F2),(v) EndTable -Table: 3-byte opcode 2 (0x0f 0x3a) +Table: 3-byte opcode 3 (0x0f 0x3a) Referrer: 3-byte escape 2 AVXcode: 3 # 0x0f 0x3a 0x00-0xff @@ -948,7 +958,7 @@ GrpTable: Grp7 2: LGDT Ms | XGETBV (000),(11B) | XSETBV (001),(11B) | VMFUNC (100),(11B) | XEND (101)(11B) | XTEST (110)(11B) 3: LIDT Ms 4: SMSW Mw/Rv -5: rdpkru (110),(11B) | wrpkru (111),(11B) +5: rdpkru (110),(11B) | wrpkru (111),(11B) | RSTORSSP Mq (F3) 6: LMSW Ew 7: INVLPG Mb | SWAPGS (o64),(000),(11B) | RDTSCP (001),(11B) EndTable @@ -1019,8 +1029,8 @@ GrpTable: Grp15 2: vldmxcsr Md (v1) | WRFSBASE Ry (F3),(11B) 3: vstmxcsr Md (v1) | WRGSBASE Ry (F3),(11B) 4: XSAVE | ptwrite Ey (F3),(11B) -5: XRSTOR | lfence (11B) -6: XSAVEOPT | clwb (66) | mfence (11B) +5: XRSTOR | lfence (11B) | INCSSP Rd (F3),REX.W +6: XSAVEOPT | clwb (66) | mfence (11B) | CLRSSBSY Mq (F3) 7: clflush | clflushopt (66) | sfence (11B) EndTable -- 2.17.1