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Peter Anvin" , Paolo Bonzini , =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , Arnaldo Carvalho de Melo , Mark Rutland , Alexander Shishkin , Jiri Olsa , Namhyung Kim , Sasha Levin , , Subject: [PATCH 1/4] x86/asm: Allow to pass macros to __ASM_FORM() Date: Tue, 10 May 2022 13:30:30 +0000 Message-ID: <20220510133036.46767-2-mheyne@amazon.de> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220510133036.46767-1-mheyne@amazon.de> References: <20220510133036.46767-1-mheyne@amazon.de> MIME-Version: 1.0 Precedence: Bulk Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @amazon.de) X-ZM-MESSAGEID: 1652189520331100001 Content-Type: text/plain; charset="utf-8" From: Masami Hiramatsu commit f7919fd943abf0c77aed4441ea9897a323d132f5 upstream Use __stringify() at __ASM_FORM() so that user can pass code including macros to __ASM_FORM(). Signed-off-by: Masami Hiramatsu Signed-off-by: Peter Zijlstra (Intel) Cc: Juergen Gross Cc: x86@kernel.org Cc: Boris Ostrovsky Cc: Ingo Molnar Cc: Stefano Stabellini Cc: Andrew Cooper Cc: Borislav Petkov Cc: xen-devel@lists.xenproject.org Cc: Randy Dunlap Cc: Josh Poimboeuf Link: https://lkml.kernel.org/r/156777562873.25081.2288083344657460959.stgi= t@devnote2 Signed-off-by: Maximilian Heyne Cc: stable@vger.kernel.org # 5.4.x --- arch/x86/include/asm/asm.h | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/arch/x86/include/asm/asm.h b/arch/x86/include/asm/asm.h index 3ff577c0b102..1b563f9167ea 100644 --- a/arch/x86/include/asm/asm.h +++ b/arch/x86/include/asm/asm.h @@ -7,9 +7,11 @@ # define __ASM_FORM_RAW(x) x # define __ASM_FORM_COMMA(x) x, #else -# define __ASM_FORM(x) " " #x " " -# define __ASM_FORM_RAW(x) #x -# define __ASM_FORM_COMMA(x) " " #x "," +#include + +# define __ASM_FORM(x) " " __stringify(x) " " +# define __ASM_FORM_RAW(x) __stringify(x) +# define __ASM_FORM_COMMA(x) " " __stringify(x) "," #endif =20 #ifndef __x86_64__ --=20 2.32.0 Amazon Development Center Germany GmbH Krausenstr. 38 10117 Berlin Geschaeftsfuehrung: Christian Schlaeger, Jonathan Weiss Eingetragen am Amtsgericht Charlottenburg unter HRB 149173 B Sitz: Berlin Ust-ID: DE 289 237 879 From nobody Sun Apr 28 10:45:49 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; 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d="scan'208";a="196877995" From: Maximilian Heyne To: CC: Masami Hiramatsu , Peter Zijlstra , Juergen Gross , , Ingo Molnar , Boris Ostrovsky , Andrew Cooper , Stefano Stabellini , Borislav Petkov , , Randy Dunlap , Josh Poimboeuf , Maximilian Heyne , , Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , Paolo Bonzini , =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , Arnaldo Carvalho de Melo , Mark Rutland , Alexander Shishkin , Jiri Olsa , Namhyung Kim , Sasha Levin , , Subject: [PATCH 2/4] x86: xen: kvm: Gather the definition of emulate prefixes Date: Tue, 10 May 2022 13:30:31 +0000 Message-ID: <20220510133036.46767-3-mheyne@amazon.de> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220510133036.46767-1-mheyne@amazon.de> References: <20220510133036.46767-1-mheyne@amazon.de> MIME-Version: 1.0 Precedence: Bulk Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @amazon.de) X-ZM-MESSAGEID: 1652189534370100001 Content-Type: text/plain; charset="utf-8" From: Masami Hiramatsu commit b3dc0695fa40c3b280230fb6fb7fb7a94ce28bf4 upstream Gather the emulate prefixes, which forcibly make the following instruction emulated on virtualization, in one place. Suggested-by: Peter Zijlstra Signed-off-by: Masami Hiramatsu Signed-off-by: Peter Zijlstra (Intel) Cc: Juergen Gross Cc: x86@kernel.org Cc: Ingo Molnar Cc: Boris Ostrovsky Cc: Andrew Cooper Cc: Stefano Stabellini Cc: Borislav Petkov Cc: xen-devel@lists.xenproject.org Cc: Randy Dunlap Cc: Josh Poimboeuf Link: https://lkml.kernel.org/r/156777563917.25081.7286628561790289995.stgi= t@devnote2 Signed-off-by: Maximilian Heyne Cc: stable@vger.kernel.org # 5.4.x --- arch/x86/include/asm/emulate_prefix.h | 14 ++++++++++++++ arch/x86/include/asm/xen/interface.h | 11 ++++------- arch/x86/kvm/x86.c | 4 +++- 3 files changed, 21 insertions(+), 8 deletions(-) create mode 100644 arch/x86/include/asm/emulate_prefix.h diff --git a/arch/x86/include/asm/emulate_prefix.h b/arch/x86/include/asm/e= mulate_prefix.h new file mode 100644 index 000000000000..70f5b98a5286 --- /dev/null +++ b/arch/x86/include/asm/emulate_prefix.h @@ -0,0 +1,14 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_X86_EMULATE_PREFIX_H +#define _ASM_X86_EMULATE_PREFIX_H + +/* + * Virt escape sequences to trigger instruction emulation; + * ideally these would decode to 'whole' instruction and not destroy + * the instruction stream; sadly this is not true for the 'kvm' one :/ + */ + +#define __XEN_EMULATE_PREFIX 0x0f,0x0b,0x78,0x65,0x6e /* ud2 ; .ascii "x= en" */ +#define __KVM_EMULATE_PREFIX 0x0f,0x0b,0x6b,0x76,0x6d /* ud2 ; .ascii "kv= m" */ + +#endif diff --git a/arch/x86/include/asm/xen/interface.h b/arch/x86/include/asm/xe= n/interface.h index 62ca03ef5c65..9139b3e86316 100644 --- a/arch/x86/include/asm/xen/interface.h +++ b/arch/x86/include/asm/xen/interface.h @@ -379,12 +379,9 @@ struct xen_pmu_arch { * Prefix forces emulation of some non-trapping instructions. * Currently only CPUID. */ -#ifdef __ASSEMBLY__ -#define XEN_EMULATE_PREFIX .byte 0x0f,0x0b,0x78,0x65,0x6e ; -#define XEN_CPUID XEN_EMULATE_PREFIX cpuid -#else -#define XEN_EMULATE_PREFIX ".byte 0x0f,0x0b,0x78,0x65,0x6e ; " -#define XEN_CPUID XEN_EMULATE_PREFIX "cpuid" -#endif +#include + +#define XEN_EMULATE_PREFIX __ASM_FORM(.byte __XEN_EMULATE_PREFIX ;) +#define XEN_CPUID XEN_EMULATE_PREFIX __ASM_FORM(cpuid) =20 #endif /* _ASM_X86_XEN_INTERFACE_H */ diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 1f7dfa5aa42d..6dd77e426889 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -68,6 +68,7 @@ #include #include #include +#include #include =20 #define CREATE_TRACE_POINTS @@ -5583,6 +5584,7 @@ EXPORT_SYMBOL_GPL(kvm_write_guest_virt_system); =20 int handle_ud(struct kvm_vcpu *vcpu) { + static const char kvm_emulate_prefix[] =3D { __KVM_EMULATE_PREFIX }; int emul_type =3D EMULTYPE_TRAP_UD; char sig[5]; /* ud2; .ascii "kvm" */ struct x86_exception e; @@ -5590,7 +5592,7 @@ int handle_ud(struct kvm_vcpu *vcpu) if (force_emulation_prefix && kvm_read_guest_virt(vcpu, kvm_get_linear_rip(vcpu), sig, sizeof(sig), &e) =3D=3D 0 && - memcmp(sig, "\xf\xbkvm", sizeof(sig)) =3D=3D 0) { + memcmp(sig, kvm_emulate_prefix, sizeof(sig)) =3D=3D 0) { kvm_rip_write(vcpu, kvm_rip_read(vcpu) + sizeof(sig)); emul_type =3D EMULTYPE_TRAP_UD_FORCED; } --=20 2.32.0 Amazon Development Center Germany GmbH Krausenstr. 38 10117 Berlin Geschaeftsfuehrung: Christian Schlaeger, Jonathan Weiss Eingetragen am Amtsgericht Charlottenburg unter HRB 149173 B Sitz: Berlin Ust-ID: DE 289 237 879 From nobody Sun Apr 28 10:45:49 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; 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d="scan'208";a="193949666" From: Maximilian Heyne To: CC: Masami Hiramatsu , Peter Zijlstra , Josh Poimboeuf , Juergen Gross , , Boris Ostrovsky , Ingo Molnar , Stefano Stabellini , Andrew Cooper , Borislav Petkov , , Randy Dunlap , Maximilian Heyne , , Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , Paolo Bonzini , =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , Arnaldo Carvalho de Melo , Mark Rutland , Alexander Shishkin , Jiri Olsa , Namhyung Kim , Sasha Levin , , Subject: [PATCH 3/4] x86: xen: insn: Decode Xen and KVM emulate-prefix signature Date: Tue, 10 May 2022 13:30:32 +0000 Message-ID: <20220510133036.46767-4-mheyne@amazon.de> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220510133036.46767-1-mheyne@amazon.de> References: <20220510133036.46767-1-mheyne@amazon.de> MIME-Version: 1.0 Precedence: Bulk Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @amazon.de) X-ZM-MESSAGEID: 1652189528140100001 Content-Type: text/plain; charset="utf-8" From: Masami Hiramatsu commit 4d65adfcd1196818659d3bd9b42dccab291e1751 upstream Decode Xen and KVM's emulate-prefix signature by x86 insn decoder. It is called "prefix" but actually not x86 instruction prefix, so this adds insn.emulate_prefix_size field instead of reusing insn.prefixes. If x86 decoder finds a special sequence of instructions of XEN_EMULATE_PREFIX and 'ud2a; .ascii "kvm"', it just counts the length, set insn.emulate_prefix_size and fold it with the next instruction. In other words, the signature and the next instruction is treated as a single instruction. Signed-off-by: Masami Hiramatsu Signed-off-by: Peter Zijlstra (Intel) Acked-by: Josh Poimboeuf Cc: Juergen Gross Cc: x86@kernel.org Cc: Boris Ostrovsky Cc: Ingo Molnar Cc: Stefano Stabellini Cc: Andrew Cooper Cc: Borislav Petkov Cc: xen-devel@lists.xenproject.org Cc: Randy Dunlap Link: https://lkml.kernel.org/r/156777564986.25081.4964537658500952557.stgi= t@devnote2 [mheyne: resolved contextual conflict in tools/objtools/sync-check.sh] Signed-off-by: Maximilian Heyne Cc: stable@vger.kernel.org # 5.4.x --- arch/x86/include/asm/insn.h | 6 ++++ arch/x86/lib/insn.c | 34 +++++++++++++++++++++ tools/arch/x86/include/asm/emulate_prefix.h | 14 +++++++++ tools/arch/x86/include/asm/insn.h | 6 ++++ tools/arch/x86/lib/insn.c | 34 +++++++++++++++++++++ tools/objtool/sync-check.sh | 3 +- tools/perf/check-headers.sh | 3 +- 7 files changed, 98 insertions(+), 2 deletions(-) create mode 100644 tools/arch/x86/include/asm/emulate_prefix.h diff --git a/arch/x86/include/asm/insn.h b/arch/x86/include/asm/insn.h index a51ffeea6d87..a8c3d284fa46 100644 --- a/arch/x86/include/asm/insn.h +++ b/arch/x86/include/asm/insn.h @@ -45,6 +45,7 @@ struct insn { struct insn_field immediate2; /* for 64bit imm or seg16 */ }; =20 + int emulate_prefix_size; insn_attr_t attr; unsigned char opnd_bytes; unsigned char addr_bytes; @@ -128,6 +129,11 @@ static inline int insn_is_evex(struct insn *insn) return (insn->vex_prefix.nbytes =3D=3D 4); } =20 +static inline int insn_has_emulate_prefix(struct insn *insn) +{ + return !!insn->emulate_prefix_size; +} + /* Ensure this instruction is decoded completely */ static inline int insn_complete(struct insn *insn) { diff --git a/arch/x86/lib/insn.c b/arch/x86/lib/insn.c index 0b5862ba6a75..404279563891 100644 --- a/arch/x86/lib/insn.c +++ b/arch/x86/lib/insn.c @@ -13,6 +13,8 @@ #include #include =20 +#include + /* Verify next sizeof(t) bytes can be on the same instruction */ #define validate_next(t, insn, n) \ ((insn)->next_byte + sizeof(t) + n <=3D (insn)->end_kaddr) @@ -58,6 +60,36 @@ void insn_init(struct insn *insn, const void *kaddr, int= buf_len, int x86_64) insn->addr_bytes =3D 4; } =20 +static const insn_byte_t xen_prefix[] =3D { __XEN_EMULATE_PREFIX }; +static const insn_byte_t kvm_prefix[] =3D { __KVM_EMULATE_PREFIX }; + +static int __insn_get_emulate_prefix(struct insn *insn, + const insn_byte_t *prefix, size_t len) +{ + size_t i; + + for (i =3D 0; i < len; i++) { + if (peek_nbyte_next(insn_byte_t, insn, i) !=3D prefix[i]) + goto err_out; + } + + insn->emulate_prefix_size =3D len; + insn->next_byte +=3D len; + + return 1; + +err_out: + return 0; +} + +static void insn_get_emulate_prefix(struct insn *insn) +{ + if (__insn_get_emulate_prefix(insn, xen_prefix, sizeof(xen_prefix))) + return; + + __insn_get_emulate_prefix(insn, kvm_prefix, sizeof(kvm_prefix)); +} + /** * insn_get_prefixes - scan x86 instruction prefix bytes * @insn: &struct insn containing instruction @@ -76,6 +108,8 @@ void insn_get_prefixes(struct insn *insn) if (prefixes->got) return; =20 + insn_get_emulate_prefix(insn); + nb =3D 0; lb =3D 0; b =3D peek_next(insn_byte_t, insn); diff --git a/tools/arch/x86/include/asm/emulate_prefix.h b/tools/arch/x86/i= nclude/asm/emulate_prefix.h new file mode 100644 index 000000000000..70f5b98a5286 --- /dev/null +++ b/tools/arch/x86/include/asm/emulate_prefix.h @@ -0,0 +1,14 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_X86_EMULATE_PREFIX_H +#define _ASM_X86_EMULATE_PREFIX_H + +/* + * Virt escape sequences to trigger instruction emulation; + * ideally these would decode to 'whole' instruction and not destroy + * the instruction stream; sadly this is not true for the 'kvm' one :/ + */ + +#define __XEN_EMULATE_PREFIX 0x0f,0x0b,0x78,0x65,0x6e /* ud2 ; .ascii "x= en" */ +#define __KVM_EMULATE_PREFIX 0x0f,0x0b,0x6b,0x76,0x6d /* ud2 ; .ascii "kv= m" */ + +#endif diff --git a/tools/arch/x86/include/asm/insn.h b/tools/arch/x86/include/asm= /insn.h index d7f0ae8f3c44..52c6262e6bfd 100644 --- a/tools/arch/x86/include/asm/insn.h +++ b/tools/arch/x86/include/asm/insn.h @@ -45,6 +45,7 @@ struct insn { struct insn_field immediate2; /* for 64bit imm or seg16 */ }; =20 + int emulate_prefix_size; insn_attr_t attr; unsigned char opnd_bytes; unsigned char addr_bytes; @@ -128,6 +129,11 @@ static inline int insn_is_evex(struct insn *insn) return (insn->vex_prefix.nbytes =3D=3D 4); } =20 +static inline int insn_has_emulate_prefix(struct insn *insn) +{ + return !!insn->emulate_prefix_size; +} + /* Ensure this instruction is decoded completely */ static inline int insn_complete(struct insn *insn) { diff --git a/tools/arch/x86/lib/insn.c b/tools/arch/x86/lib/insn.c index 79e048f1d902..0151dfc6da61 100644 --- a/tools/arch/x86/lib/insn.c +++ b/tools/arch/x86/lib/insn.c @@ -13,6 +13,8 @@ #include "../include/asm/inat.h" #include "../include/asm/insn.h" =20 +#include "../include/asm/emulate_prefix.h" + /* Verify next sizeof(t) bytes can be on the same instruction */ #define validate_next(t, insn, n) \ ((insn)->next_byte + sizeof(t) + n <=3D (insn)->end_kaddr) @@ -58,6 +60,36 @@ void insn_init(struct insn *insn, const void *kaddr, int= buf_len, int x86_64) insn->addr_bytes =3D 4; } =20 +static const insn_byte_t xen_prefix[] =3D { __XEN_EMULATE_PREFIX }; +static const insn_byte_t kvm_prefix[] =3D { __KVM_EMULATE_PREFIX }; + +static int __insn_get_emulate_prefix(struct insn *insn, + const insn_byte_t *prefix, size_t len) +{ + size_t i; + + for (i =3D 0; i < len; i++) { + if (peek_nbyte_next(insn_byte_t, insn, i) !=3D prefix[i]) + goto err_out; + } + + insn->emulate_prefix_size =3D len; + insn->next_byte +=3D len; + + return 1; + +err_out: + return 0; +} + +static void insn_get_emulate_prefix(struct insn *insn) +{ + if (__insn_get_emulate_prefix(insn, xen_prefix, sizeof(xen_prefix))) + return; + + __insn_get_emulate_prefix(insn, kvm_prefix, sizeof(kvm_prefix)); +} + /** * insn_get_prefixes - scan x86 instruction prefix bytes * @insn: &struct insn containing instruction @@ -76,6 +108,8 @@ void insn_get_prefixes(struct insn *insn) if (prefixes->got) return; =20 + insn_get_emulate_prefix(insn); + nb =3D 0; lb =3D 0; b =3D peek_next(insn_byte_t, insn); diff --git a/tools/objtool/sync-check.sh b/tools/objtool/sync-check.sh index c3ae1e8ae119..2a1261bfbb62 100755 --- a/tools/objtool/sync-check.sh +++ b/tools/objtool/sync-check.sh @@ -4,6 +4,7 @@ FILES=3D' arch/x86/include/asm/inat_types.h arch/x86/include/asm/orc_types.h +arch/x86/include/asm/emulate_prefix.h arch/x86/lib/x86-opcode-map.txt arch/x86/tools/gen-insn-attr-x86.awk ' @@ -46,4 +47,4 @@ done check arch/x86/include/asm/inat.h '-I "^#include [\"<]\(asm/\)*inat_ty= pes.h[\">]"' check arch/x86/include/asm/insn.h '-I "^#include [\"<]\(asm/\)*inat.h[= \">]"' check arch/x86/lib/inat.c '-I "^#include [\"<]\(../include/\)*= asm/insn.h[\">]"' -check arch/x86/lib/insn.c '-I "^#include [\"<]\(../include/\)*= asm/in\(at\|sn\).h[\">]"' +check arch/x86/lib/insn.c '-I "^#include [\"<]\(../include/\)*= asm/in\(at\|sn\).h[\">]" -I "^#include [\"<]\(../include/\)*asm/emulate_pre= fix.h[\">]"' diff --git a/tools/perf/check-headers.sh b/tools/perf/check-headers.sh index cea13cb987d0..499235a41162 100755 --- a/tools/perf/check-headers.sh +++ b/tools/perf/check-headers.sh @@ -28,6 +28,7 @@ arch/x86/include/asm/disabled-features.h arch/x86/include/asm/required-features.h arch/x86/include/asm/cpufeatures.h arch/x86/include/asm/inat_types.h +arch/x86/include/asm/emulate_prefix.h arch/x86/include/uapi/asm/prctl.h arch/x86/lib/x86-opcode-map.txt arch/x86/tools/gen-insn-attr-x86.awk @@ -116,7 +117,7 @@ check lib/ctype.c '-I "^EXPORT_SYMBOL" -I "^#inc= lude " -B check arch/x86/include/asm/inat.h '-I "^#include [\"<]\(asm/\)*inat_ty= pes.h[\">]"' check arch/x86/include/asm/insn.h '-I "^#include [\"<]\(asm/\)*inat.h[= \">]"' check arch/x86/lib/inat.c '-I "^#include [\"<]\(../include/\)*asm/in= sn.h[\">]"' -check arch/x86/lib/insn.c '-I "^#include [\"<]\(../include/\)*asm/in= \(at\|sn\).h[\">]"' +check arch/x86/lib/insn.c '-I "^#include [\"<]\(../include/\)*= asm/in\(at\|sn\).h[\">]" -I "^#include [\"<]\(../include/\)*asm/emulate_pre= fix.h[\">]"' =20 # diff non-symmetric files check_2 tools/perf/arch/x86/entry/syscalls/syscall_64.tbl arch/x86/entry/s= yscalls/syscall_64.tbl --=20 2.32.0 Amazon Development Center Germany GmbH Krausenstr. 38 10117 Berlin Geschaeftsfuehrung: Christian Schlaeger, Jonathan Weiss Eingetragen am Amtsgericht Charlottenburg unter HRB 149173 B Sitz: Berlin Ust-ID: DE 289 237 879 From nobody Sun Apr 28 10:45:49 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; 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d="scan'208";a="87035422" From: Maximilian Heyne To: CC: Masami Hiramatsu , Peter Zijlstra , Juergen Gross , , Boris Ostrovsky , Ingo Molnar , Stefano Stabellini , Andrew Cooper , Borislav Petkov , , Randy Dunlap , Josh Poimboeuf , Maximilian Heyne , , Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , Paolo Bonzini , =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , Arnaldo Carvalho de Melo , Mark Rutland , Alexander Shishkin , Jiri Olsa , Namhyung Kim , Sasha Levin , , Subject: [PATCH 4/4] x86: kprobes: Prohibit probing on instruction which has emulate prefix Date: Tue, 10 May 2022 13:30:33 +0000 Message-ID: <20220510133036.46767-5-mheyne@amazon.de> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220510133036.46767-1-mheyne@amazon.de> References: <20220510133036.46767-1-mheyne@amazon.de> MIME-Version: 1.0 Precedence: Bulk Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @amazon.de) X-ZM-MESSAGEID: 1652189568392100001 Content-Type: text/plain; charset="utf-8" From: Masami Hiramatsu commit 004e8dce9c5595697951f7cd0e9f66b35c92265e upstream Prohibit probing on instruction which has XEN_EMULATE_PREFIX or KVM's emulate prefix. Since that prefix is a marker for Xen and KVM, if we modify the marker by kprobe's int3, that doesn't work as expected. Signed-off-by: Masami Hiramatsu Signed-off-by: Peter Zijlstra (Intel) Cc: Juergen Gross Cc: x86@kernel.org Cc: Boris Ostrovsky Cc: Ingo Molnar Cc: Stefano Stabellini Cc: Andrew Cooper Cc: Borislav Petkov Cc: xen-devel@lists.xenproject.org Cc: Randy Dunlap Cc: Josh Poimboeuf Link: https://lkml.kernel.org/r/156777566048.25081.6296162369492175325.stgi= t@devnote2 Signed-off-by: Maximilian Heyne Cc: stable@vger.kernel.org # 5.4.x --- arch/x86/kernel/kprobes/core.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/x86/kernel/kprobes/core.c b/arch/x86/kernel/kprobes/core.c index c205d77d57da..3700dc94847c 100644 --- a/arch/x86/kernel/kprobes/core.c +++ b/arch/x86/kernel/kprobes/core.c @@ -358,6 +358,10 @@ int __copy_instruction(u8 *dest, u8 *src, u8 *real, st= ruct insn *insn) kernel_insn_init(insn, dest, MAX_INSN_SIZE); insn_get_length(insn); =20 + /* We can not probe force emulate prefixed instruction */ + if (insn_has_emulate_prefix(insn)) + return 0; + /* Another subsystem puts a breakpoint, failed to recover */ if (insn->opcode.bytes[0] =3D=3D BREAKPOINT_INSTRUCTION) return 0; --=20 2.32.0 Amazon Development Center Germany GmbH Krausenstr. 38 10117 Berlin Geschaeftsfuehrung: Christian Schlaeger, Jonathan Weiss Eingetragen am Amtsgericht Charlottenburg unter HRB 149173 B Sitz: Berlin Ust-ID: DE 289 237 879