From: Borislav Petkov <bp@suse.de> To: Ricardo Neri <ricardo.neri-calderon@linux.intel.com> Cc: Ingo Molnar <mingo@redhat.com>, Thomas Gleixner <tglx@linutronix.de>, "H. Peter Anvin" <hpa@zytor.com>, Andy Lutomirski <luto@kernel.org>, Peter Zijlstra <peterz@infradead.org>, Andrew Morton <akpm@linux-foundation.org>, Brian Gerst <brgerst@gmail.com>, Chris Metcalf <cmetcalf@mellanox.com>, Dave Hansen <dave.hansen@linux.intel.com>, Paolo Bonzini <pbonzini@redhat.com>, Masami Hiramatsu <mhiramat@kernel.org>, Huang Rui <ray.huang@amd.com>, Jiri Slaby <jslaby@suse.cz>, Jonathan Corbet <corbet@lwn.net>, "Michael S. Tsirkin" <mst@redhat.com>, Paul Gortmaker <paul.gortmaker@windriver.com>, Vlastimil Babka <vbabka@suse.cz>, Chen Yucong <slaoub@gmail.com>, Alexandre Julliard <julliard@winehq.org>, Stas Sergeev <stsp@list.ru>, Fenghua Yu <fenghua.yu@intel.com>, "Ravi V. Shankar" <ravi.v.shankar@intel.com>, Shuah Khan <shuah@kernel.org>, linux-kernel@vger.kernel.org, x86@kernel.org, linux-msdos@vger.kernel.org, wine-devel@winehq.org, Adam Buchbinder <adam.buchbinder@gmail.com>, Colin Ian King <colin.king@canonical.com>, Lorenzo Stoakes <lstoakes@gmail.com>, Qiaowei Ren <qiaowei.ren@intel.com>, Arnaldo Carvalho de Melo <acme@redhat.com>, Adrian Hunter <adrian.hunter@intel.com>, Kees Cook <keescook@chromium.org>, Thomas Garnier <thgarnie@google.com>, Dmitry Vyukov <dvyukov@google.com> Subject: Re: [PATCH v7 08/26] x86/insn-eval: Add a utility function to get register offsets Date: Mon, 29 May 2017 19:16:25 +0200 [thread overview] Message-ID: <20170529171624.ai7cni33lpddaoed@pd.tnic> (raw) In-Reply-To: <20170505181724.55000-9-ricardo.neri-calderon@linux.intel.com> On Fri, May 05, 2017 at 11:17:06AM -0700, Ricardo Neri wrote: > The function get_reg_offset() returns the offset to the register the > argument specifies as indicated in an enumeration of type offset. Callers > of this function would need the definition of such enumeration. This is > not needed. Instead, add helper functions for this purpose. These functions > are useful in cases when, for instance, the caller needs to decide whether > the operand is a register or a memory location by looking at the rm part > of the ModRM byte. As of now, this is the only helper function that is > needed. > > Cc: Dave Hansen <dave.hansen@linux.intel.com> > Cc: Adam Buchbinder <adam.buchbinder@gmail.com> > Cc: Colin Ian King <colin.king@canonical.com> > Cc: Lorenzo Stoakes <lstoakes@gmail.com> > Cc: Qiaowei Ren <qiaowei.ren@intel.com> > Cc: Arnaldo Carvalho de Melo <acme@redhat.com> > Cc: Masami Hiramatsu <mhiramat@kernel.org> > Cc: Adrian Hunter <adrian.hunter@intel.com> > Cc: Kees Cook <keescook@chromium.org> > Cc: Thomas Garnier <thgarnie@google.com> > Cc: Peter Zijlstra <peterz@infradead.org> > Cc: Borislav Petkov <bp@suse.de> > Cc: Dmitry Vyukov <dvyukov@google.com> > Cc: Ravi V. Shankar <ravi.v.shankar@intel.com> > Cc: x86@kernel.org > Signed-off-by: Ricardo Neri <ricardo.neri-calderon@linux.intel.com> > --- > arch/x86/include/asm/insn-eval.h | 1 + > arch/x86/lib/insn-eval.c | 15 +++++++++++++++ > 2 files changed, 16 insertions(+) > > diff --git a/arch/x86/include/asm/insn-eval.h b/arch/x86/include/asm/insn-eval.h > index 5cab1b1..7e8c963 100644 > --- a/arch/x86/include/asm/insn-eval.h > +++ b/arch/x86/include/asm/insn-eval.h > @@ -12,5 +12,6 @@ > #include <asm/ptrace.h> > > void __user *insn_get_addr_ref(struct insn *insn, struct pt_regs *regs); > +int insn_get_modrm_rm_off(struct insn *insn, struct pt_regs *regs); > > #endif /* _ASM_X86_INSN_EVAL_H */ > diff --git a/arch/x86/lib/insn-eval.c b/arch/x86/lib/insn-eval.c > index 182e2ae..8b16761 100644 > --- a/arch/x86/lib/insn-eval.c > +++ b/arch/x86/lib/insn-eval.c > @@ -97,6 +97,21 @@ static int get_reg_offset(struct insn *insn, struct pt_regs *regs, > return regoff[regno]; > } > > +/** > + * insn_get_reg_offset_modrm_rm() - Obtain register in r/m part of ModRM byte That name needs to be synced with the function name below. > + * @insn: Instruction structure containing the ModRM byte > + * @regs: Structure with register values as seen when entering kernel mode > + * > + * Return: The register indicated by the r/m part of the ModRM byte. The > + * register is obtained as an offset from the base of pt_regs. In specific > + * cases, the returned value can be -EDOM to indicate that the particular value > + * of ModRM does not refer to a register and shall be ignored. > + */ > +int insn_get_modrm_rm_off(struct insn *insn, struct pt_regs *regs) ^^^^^^^^^^^^^^^^^^^^ -- Regards/Gruss, Boris. SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg) --
WARNING: multiple messages have this Message-ID (diff)
From: Borislav Petkov <bp@suse.de> To: Ricardo Neri <ricardo.neri-calderon@linux.intel.com> Cc: Ingo Molnar <mingo@redhat.com>, Thomas Gleixner <tglx@linutronix.de>, "H. Peter Anvin" <hpa@zytor.com>, Andy Lutomirski <luto@kernel.org>, Peter Zijlstra <peterz@infradead.org>, Andrew Morton <akpm@linux-foundation.org>, Brian Gerst <brgerst@gmail.com>, Chris Metcalf <cmetcalf@mellanox.com>, Dave Hansen <dave.hansen@linux.intel.com>, Paolo Bonzini <pbonzini@redhat.com>, Masami Hiramatsu <mhiramat@kernel.org>, Huang Rui <ray.huang@amd.com>, Jiri Slaby <jslaby@suse.cz>, Jonathan Corbet <corbet@lwn.net>, "Michael S. Tsirkin" <mst@redhat.com>, Paul Gortmaker <paul.gortmaker@windriver.com>, Vlastimil Babka <vbabka@suse.cz>, Chen Yucong <slaoub@gmail.com>, Alexandre Julliard <julliard@winehq.org>, Stas Sergeev <stsp@list.ru>, Fenghua Yu <fenghua.yu> Subject: Re: [PATCH v7 08/26] x86/insn-eval: Add a utility function to get register offsets Date: Mon, 29 May 2017 19:16:25 +0200 [thread overview] Message-ID: <20170529171624.ai7cni33lpddaoed@pd.tnic> (raw) In-Reply-To: <20170505181724.55000-9-ricardo.neri-calderon@linux.intel.com> On Fri, May 05, 2017 at 11:17:06AM -0700, Ricardo Neri wrote: > The function get_reg_offset() returns the offset to the register the > argument specifies as indicated in an enumeration of type offset. Callers > of this function would need the definition of such enumeration. This is > not needed. Instead, add helper functions for this purpose. These functions > are useful in cases when, for instance, the caller needs to decide whether > the operand is a register or a memory location by looking at the rm part > of the ModRM byte. As of now, this is the only helper function that is > needed. > > Cc: Dave Hansen <dave.hansen@linux.intel.com> > Cc: Adam Buchbinder <adam.buchbinder@gmail.com> > Cc: Colin Ian King <colin.king@canonical.com> > Cc: Lorenzo Stoakes <lstoakes@gmail.com> > Cc: Qiaowei Ren <qiaowei.ren@intel.com> > Cc: Arnaldo Carvalho de Melo <acme@redhat.com> > Cc: Masami Hiramatsu <mhiramat@kernel.org> > Cc: Adrian Hunter <adrian.hunter@intel.com> > Cc: Kees Cook <keescook@chromium.org> > Cc: Thomas Garnier <thgarnie@google.com> > Cc: Peter Zijlstra <peterz@infradead.org> > Cc: Borislav Petkov <bp@suse.de> > Cc: Dmitry Vyukov <dvyukov@google.com> > Cc: Ravi V. Shankar <ravi.v.shankar@intel.com> > Cc: x86@kernel.org > Signed-off-by: Ricardo Neri <ricardo.neri-calderon@linux.intel.com> > --- > arch/x86/include/asm/insn-eval.h | 1 + > arch/x86/lib/insn-eval.c | 15 +++++++++++++++ > 2 files changed, 16 insertions(+) > > diff --git a/arch/x86/include/asm/insn-eval.h b/arch/x86/include/asm/insn-eval.h > index 5cab1b1..7e8c963 100644 > --- a/arch/x86/include/asm/insn-eval.h > +++ b/arch/x86/include/asm/insn-eval.h > @@ -12,5 +12,6 @@ > #include <asm/ptrace.h> > > void __user *insn_get_addr_ref(struct insn *insn, struct pt_regs *regs); > +int insn_get_modrm_rm_off(struct insn *insn, struct pt_regs *regs); > > #endif /* _ASM_X86_INSN_EVAL_H */ > diff --git a/arch/x86/lib/insn-eval.c b/arch/x86/lib/insn-eval.c > index 182e2ae..8b16761 100644 > --- a/arch/x86/lib/insn-eval.c > +++ b/arch/x86/lib/insn-eval.c > @@ -97,6 +97,21 @@ static int get_reg_offset(struct insn *insn, struct pt_regs *regs, > return regoff[regno]; > } > > +/** > + * insn_get_reg_offset_modrm_rm() - Obtain register in r/m part of ModRM byte That name needs to be synced with the function name below. > + * @insn: Instruction structure containing the ModRM byte > + * @regs: Structure with register values as seen when entering kernel mode > + * > + * Return: The register indicated by the r/m part of the ModRM byte. The > + * register is obtained as an offset from the base of pt_regs. In specific > + * cases, the returned value can be -EDOM to indicate that the particular value > + * of ModRM does not refer to a register and shall be ignored. > + */ > +int insn_get_modrm_rm_off(struct insn *insn, struct pt_regs *regs) ^^^^^^^^^^^^^^^^^^^^ -- Regards/Gruss, Boris. SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg) --
next prev parent reply other threads:[~2017-05-29 17:16 UTC|newest] Thread overview: 164+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-05-05 18:16 [PATCH v7 00/26] x86: Enable User-Mode Instruction Prevention Ricardo Neri 2017-05-05 18:16 ` Ricardo Neri 2017-05-05 18:16 ` [PATCH v7 01/26] ptrace,x86: Make user_64bit_mode() available to 32-bit builds Ricardo Neri 2017-05-05 18:16 ` Ricardo Neri 2017-05-21 14:19 ` Borislav Petkov 2017-05-21 14:19 ` Borislav Petkov 2017-05-05 18:17 ` [PATCH v7 02/26] x86/mm: Relocate page fault error codes to traps.h Ricardo Neri 2017-05-05 18:17 ` Ricardo Neri 2017-05-21 14:23 ` Borislav Petkov 2017-05-21 14:23 ` Borislav Petkov 2017-05-27 3:40 ` Ricardo Neri 2017-05-27 3:40 ` Ricardo Neri 2017-05-27 10:13 ` Borislav Petkov 2017-05-27 10:13 ` Borislav Petkov 2017-06-01 3:09 ` Ricardo Neri 2017-06-01 3:09 ` Ricardo Neri 2017-05-05 18:17 ` [PATCH v7 03/26] x86/mpx: Use signed variables to compute effective addresses Ricardo Neri 2017-05-05 18:17 ` Ricardo Neri 2017-05-05 18:17 ` [PATCH v7 04/26] x86/mpx: Do not use SIB.index if its value is 100b and ModRM.mod is not 11b Ricardo Neri 2017-05-05 18:17 ` Ricardo Neri 2017-05-24 13:37 ` Borislav Petkov 2017-05-24 13:37 ` Borislav Petkov 2017-05-27 3:36 ` Ricardo Neri 2017-05-27 3:36 ` Ricardo Neri 2017-05-05 18:17 ` [PATCH v7 05/26] x86/mpx: Do not use SIB.base if its value is 101b and ModRM.mod = 0 Ricardo Neri 2017-05-05 18:17 ` Ricardo Neri 2017-05-29 13:07 ` Borislav Petkov 2017-05-29 13:07 ` Borislav Petkov 2017-06-06 6:08 ` Ricardo Neri 2017-06-06 6:08 ` Ricardo Neri 2017-05-05 18:17 ` [PATCH v7 06/26] x86/mpx, x86/insn: Relocate insn util functions to a new insn-eval file Ricardo Neri 2017-05-05 18:17 ` Ricardo Neri 2017-05-05 18:17 ` [PATCH v7 07/26] x86/insn-eval: Do not BUG on invalid register type Ricardo Neri 2017-05-05 18:17 ` Ricardo Neri 2017-05-29 16:37 ` Borislav Petkov 2017-05-29 16:37 ` Borislav Petkov 2017-06-06 6:06 ` Ricardo Neri 2017-06-06 6:06 ` Ricardo Neri 2017-06-06 11:58 ` Borislav Petkov 2017-06-06 11:58 ` Borislav Petkov 2017-06-07 0:28 ` Ricardo Neri 2017-06-07 0:28 ` Ricardo Neri 2017-06-07 12:21 ` Borislav Petkov 2017-06-07 12:21 ` Borislav Petkov 2017-06-07 18:54 ` Stas Sergeev 2017-06-27 19:03 ` Ricardo Neri 2017-05-05 18:17 ` [PATCH v7 08/26] x86/insn-eval: Add a utility function to get register offsets Ricardo Neri 2017-05-05 18:17 ` Ricardo Neri 2017-05-29 17:16 ` Borislav Petkov [this message] 2017-05-29 17:16 ` Borislav Petkov 2017-06-06 6:02 ` Ricardo Neri 2017-06-06 6:02 ` Ricardo Neri 2017-05-05 18:17 ` [PATCH v7 09/26] x86/insn-eval: Add utility function to identify string instructions Ricardo Neri 2017-05-05 18:17 ` Ricardo Neri 2017-05-29 21:48 ` Borislav Petkov 2017-05-29 21:48 ` Borislav Petkov 2017-06-06 6:01 ` Ricardo Neri 2017-06-06 6:01 ` Ricardo Neri 2017-06-06 12:04 ` Borislav Petkov 2017-06-06 12:04 ` Borislav Petkov 2017-05-05 18:17 ` [PATCH v7 10/26] x86/insn-eval: Add utility functions to get segment selector Ricardo Neri 2017-05-05 18:17 ` Ricardo Neri 2017-05-30 10:35 ` Borislav Petkov 2017-05-30 10:35 ` Borislav Petkov 2017-06-15 18:37 ` Ricardo Neri 2017-06-15 18:37 ` Ricardo Neri 2017-06-15 19:04 ` Ricardo Neri 2017-06-15 19:04 ` Ricardo Neri 2017-06-19 15:29 ` Borislav Petkov 2017-06-19 15:29 ` Borislav Petkov 2017-06-19 15:37 ` Borislav Petkov 2017-06-19 15:37 ` Borislav Petkov 2017-05-05 18:17 ` [PATCH v7 11/26] x86/insn-eval: Add utility function to get segment descriptor Ricardo Neri 2017-05-05 18:17 ` Ricardo Neri 2017-05-05 18:17 ` [PATCH v7 12/26] x86/insn-eval: Add utility functions to get segment descriptor base address and limit Ricardo Neri 2017-05-05 18:17 ` Ricardo Neri 2017-05-31 16:58 ` Borislav Petkov 2017-05-31 16:58 ` Borislav Petkov 2017-06-03 17:23 ` Ricardo Neri 2017-06-03 17:23 ` Ricardo Neri 2017-05-05 18:17 ` [PATCH v7 13/26] x86/insn-eval: Add function to get default params of code segment Ricardo Neri 2017-05-05 18:17 ` Ricardo Neri 2017-06-07 12:59 ` Borislav Petkov 2017-06-07 12:59 ` Borislav Petkov 2017-06-15 19:24 ` Ricardo Neri 2017-06-15 19:24 ` Ricardo Neri 2017-06-19 17:11 ` Borislav Petkov 2017-06-19 17:11 ` Borislav Petkov 2017-05-05 18:17 ` [PATCH v7 14/26] x86/insn-eval: Indicate a 32-bit displacement if ModRM.mod is 0 and ModRM.rm is 5 Ricardo Neri 2017-05-05 18:17 ` Ricardo Neri 2017-06-07 13:15 ` Borislav Petkov 2017-06-07 13:15 ` Borislav Petkov 2017-06-15 19:36 ` Ricardo Neri 2017-06-15 19:36 ` Ricardo Neri 2017-05-05 18:17 ` [PATCH v7 15/26] x86/insn-eval: Incorporate segment base and limit in linear address computation Ricardo Neri 2017-05-05 18:17 ` Ricardo Neri 2017-05-05 18:17 ` [PATCH v7 16/26] x86/insn-eval: Support both signed 32-bit and 64-bit effective addresses Ricardo Neri 2017-05-05 18:17 ` Ricardo Neri 2017-06-07 15:48 ` Borislav Petkov 2017-06-07 15:48 ` Borislav Petkov 2017-07-25 23:48 ` Ricardo Neri 2017-07-25 23:48 ` Ricardo Neri 2017-07-27 13:26 ` Borislav Petkov 2017-07-27 13:26 ` Borislav Petkov 2017-07-28 2:04 ` Ricardo Neri 2017-07-28 2:04 ` Ricardo Neri 2017-07-28 6:50 ` Borislav Petkov 2017-07-28 6:50 ` Borislav Petkov 2017-06-07 15:49 ` Borislav Petkov 2017-06-07 15:49 ` Borislav Petkov 2017-06-15 19:58 ` Ricardo Neri 2017-06-15 19:58 ` Ricardo Neri 2017-05-05 18:17 ` [PATCH v7 17/26] x86/insn-eval: Handle 32-bit address encodings in virtual-8086 mode Ricardo Neri 2017-05-05 18:17 ` Ricardo Neri 2017-05-05 18:17 ` [PATCH v7 18/26] x86/insn-eval: Add support to resolve 16-bit addressing encodings Ricardo Neri 2017-05-05 18:17 ` Ricardo Neri 2017-06-07 16:28 ` Borislav Petkov 2017-06-07 16:28 ` Borislav Petkov 2017-06-15 21:50 ` Ricardo Neri 2017-06-15 21:50 ` Ricardo Neri 2017-05-05 18:17 ` [PATCH v7 19/26] x86/insn-eval: Add wrapper function for 16-bit and 32-bit address encodings Ricardo Neri 2017-05-05 18:17 ` Ricardo Neri 2017-05-05 18:17 ` [PATCH v7 20/26] x86/cpufeature: Add User-Mode Instruction Prevention definitions Ricardo Neri 2017-05-05 18:17 ` Ricardo Neri 2017-05-06 9:04 ` Paolo Bonzini 2017-05-06 9:04 ` Paolo Bonzini 2017-05-11 3:23 ` Ricardo Neri 2017-05-11 3:23 ` Ricardo Neri 2017-06-07 18:24 ` Borislav Petkov 2017-06-07 18:24 ` Borislav Petkov 2017-05-05 18:17 ` [PATCH v7 21/26] x86: Add emulation code for UMIP instructions Ricardo Neri 2017-05-05 18:17 ` Ricardo Neri 2017-06-08 18:38 ` Borislav Petkov 2017-06-08 18:38 ` Borislav Petkov 2017-06-17 1:34 ` Ricardo Neri 2017-06-17 1:34 ` Ricardo Neri 2017-05-05 18:17 ` [PATCH v7 22/26] x86/umip: Force a page fault when unable to copy emulated result to user Ricardo Neri 2017-05-05 18:17 ` Ricardo Neri 2017-06-09 11:02 ` Borislav Petkov 2017-06-09 11:02 ` Borislav Petkov 2017-07-25 23:50 ` Ricardo Neri 2017-07-25 23:50 ` Ricardo Neri 2017-05-05 18:17 ` [PATCH v7 23/26] x86/traps: Fixup general protection faults caused by UMIP Ricardo Neri 2017-05-05 18:17 ` Ricardo Neri 2017-06-09 13:02 ` Borislav Petkov 2017-06-09 13:02 ` Borislav Petkov 2017-07-25 23:51 ` Ricardo Neri 2017-07-25 23:51 ` Ricardo Neri 2017-05-05 18:17 ` [PATCH v7 24/26] x86: Enable User-Mode Instruction Prevention Ricardo Neri 2017-05-05 18:17 ` Ricardo Neri 2017-06-09 16:10 ` Borislav Petkov 2017-06-09 16:10 ` Borislav Petkov 2017-07-26 0:44 ` Ricardo Neri 2017-07-26 0:44 ` Ricardo Neri 2017-07-27 13:57 ` Borislav Petkov 2017-07-27 13:57 ` Borislav Petkov 2017-05-05 18:17 ` [PATCH v7 25/26] selftests/x86: Add tests for " Ricardo Neri 2017-05-05 18:17 ` Ricardo Neri 2017-05-05 18:17 ` [PATCH v7 26/26] selftests/x86: Add tests for instruction str and sldt Ricardo Neri 2017-05-05 18:17 ` Ricardo Neri 2017-05-17 18:42 ` [PATCH v7 00/26] x86: Enable User-Mode Instruction Prevention Ricardo Neri 2017-05-17 18:42 ` Ricardo Neri 2017-05-27 3:49 ` Neri, Ricardo 2017-05-27 3:49 ` Neri, Ricardo
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