From: Yu-cheng Yu <yu-cheng.yu@intel.com>
To: Ingo Molnar <mingo@kernel.org>
Cc: x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
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 <arnd@arndb.de>,
Andy Lutomirski <luto@amacapital.net>,
Balbir Singh <bsingharora@gmail.com>,
Cyrill Gorcunov <gorcunov@gmail.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
Florian Weimer <fweimer@redhat.com>,
"H.J. Lu" <hjl.tools@gmail.com>, Jann Horn <jannh@google.com>,
Jonathan Corbet <corbet@lwn.net>,
Kees Cook <keescook@chromiun.org>,
Mike Kravetz <mike.kravetz@oracle.com>,
Nadav Amit <nadav.amit@gmail.com>,
Oleg Nesterov <oleg@redhat.com>, Pavel Machek <pavel@ucw.cz>,
Peter Zijlstra <peterz@infradead.org>,
"Ravi V. Shankar" <ravi.v.shankar@intel.com>,
Vedvyas Shanbhogue <vedvyas.shanbhogue@intel.com>
Subject: Re: [RFC PATCH v2 25/27] x86/cet: Add PTRACE interface for CET
Date: Wed, 11 Jul 2018 08:40:38 -0700 [thread overview]
Message-ID: <1531323638.13297.24.camel@intel.com> (raw)
In-Reply-To: <20180711102035.GB8574@gmail.com>
On Wed, 2018-07-11 at 12:20 +0200, Ingo Molnar wrote:
> * Yu-cheng Yu <yu-cheng.yu@intel.com> wrote:
>
> >
> > Add PTRACE interface for CET MSRs.
> Please *always* describe new ABIs in the changelog, in a precise,
> well-documented
> way.
Ok!
> >
> > diff --git a/arch/x86/kernel/ptrace.c b/arch/x86/kernel/ptrace.c
> > index e2ee403865eb..ac2bc3a18427 100644
> > --- a/arch/x86/kernel/ptrace.c
> > +++ b/arch/x86/kernel/ptrace.c
> > @@ -49,7 +49,9 @@ enum x86_regset {
> > REGSET_IOPERM64 = REGSET_XFP,
> > REGSET_XSTATE,
> > REGSET_TLS,
> > + REGSET_CET64 = REGSET_TLS,
> > REGSET_IOPERM32,
> > + REGSET_CET32,
> > };
> Why does REGSET_CET64 alias on REGSET_TLS?
In x86_64_regsets[], there is no [REGSET_TLS]. The core dump code
cannot handle holes in the array.
>
> >
> > struct pt_regs_offset {
> > @@ -1276,6 +1278,13 @@ static struct user_regset x86_64_regsets[]
> > __ro_after_init = {
> > .size = sizeof(long), .align = sizeof(long),
> > .active = ioperm_active, .get = ioperm_get
> > },
> > + [REGSET_CET64] = {
> > + .core_note_type = NT_X86_CET,
> > + .n = sizeof(struct cet_user_state) / sizeof(u64),
> > + .size = sizeof(u64), .align = sizeof(u64),
> > + .active = cetregs_active, .get = cetregs_get,
> > + .set = cetregs_set
> > + },
> Ok, could we first please make this part of the regset code more
> readable and
> start the series with a standalone clean-up patch that changes these
> initializers
> to something more readable:
>
> [REGSET_CET64] = {
> .core_note_type = NT_X86_CET,
> .n = sizeof(struct cet_user_state) /
> sizeof(u64),
> .size = sizeof(u64),
> .align = sizeof(u64),
> .active = cetregs_active,
> .get = cetregs_get,
> .set = cetregs_set
> },
>
> ? (I'm demonstrating the cleanup based on REGSET_CET64, but this
> should be done on
> every other entry first.)
>
I will fix it.
>
> >
> > --- a/include/uapi/linux/elf.h
> > +++ b/include/uapi/linux/elf.h
> > @@ -401,6 +401,7 @@ typedef struct elf64_shdr {
> > #define NT_386_TLS 0x200 /* i386 TLS slots
> > (struct user_desc) */
> > #define NT_386_IOPERM 0x201 /* x86 io
> > permission bitmap (1=deny) */
> > #define NT_X86_XSTATE 0x202 /* x86 extended
> > state using xsave */
> > +#define NT_X86_CET 0x203 /* x86 cet state */
> Acronyms in comments should be in capital letters.
>
> Also, I think I asked this before: why does "Control Flow
> Enforcement" abbreviate
> to "CET" (which is a well-known acronym for "Central European Time"),
> not to CFE?
>
I don't know if I can change that, will find out.
Thanks,
Yu-cheng
next prev parent reply other threads:[~2018-07-11 15:44 UTC|newest]
Thread overview: 123+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-10 22:26 [RFC PATCH v2 00/27] Control Flow Enforcement (CET) Yu-cheng Yu
2018-07-10 22:26 ` [RFC PATCH v2 01/27] x86/cpufeatures: Add CPUIDs for Control-flow Enforcement Technology (CET) Yu-cheng Yu
2018-07-10 22:26 ` [RFC PATCH v2 02/27] x86/fpu/xstate: Change some names to separate XSAVES system and user states Yu-cheng Yu
2018-07-10 22:26 ` [RFC PATCH v2 03/27] x86/fpu/xstate: Enable XSAVES system states Yu-cheng Yu
2018-07-10 22:26 ` [RFC PATCH v2 04/27] x86/fpu/xstate: Add XSAVES system states for shadow stack Yu-cheng Yu
2018-07-10 22:26 ` [RFC PATCH v2 05/27] Documentation/x86: Add CET description Yu-cheng Yu
2018-07-11 8:27 ` Pavel Machek
2018-07-11 15:25 ` Yu-cheng Yu
2018-07-11 9:57 ` Florian Weimer
2018-07-11 13:47 ` H.J. Lu
2018-07-11 14:53 ` Yu-cheng Yu
2018-07-10 22:26 ` [RFC PATCH v2 06/27] x86/cet: Control protection exception handler Yu-cheng Yu
2018-07-10 22:26 ` [RFC PATCH v2 07/27] x86/cet/shstk: Add Kconfig option for user-mode shadow stack Yu-cheng Yu
2018-07-10 22:26 ` [RFC PATCH v2 08/27] mm: Introduce VM_SHSTK for shadow stack memory Yu-cheng Yu
2018-07-11 8:34 ` Peter Zijlstra
2018-07-11 16:15 ` Yu-cheng Yu
2018-07-10 22:26 ` [RFC PATCH v2 09/27] x86/mm: Change _PAGE_DIRTY to _PAGE_DIRTY_HW Yu-cheng Yu
2018-07-10 22:26 ` [RFC PATCH v2 10/27] x86/mm: Introduce _PAGE_DIRTY_SW Yu-cheng Yu
2018-07-11 8:45 ` Peter Zijlstra
2018-07-11 9:21 ` Peter Zijlstra
2018-07-10 22:26 ` [RFC PATCH v2 11/27] x86/mm: Modify ptep_set_wrprotect and pmdp_set_wrprotect for _PAGE_DIRTY_SW Yu-cheng Yu
2018-07-10 22:44 ` Dave Hansen
2018-07-10 23:23 ` Nadav Amit
2018-07-10 23:52 ` Dave Hansen
2018-07-11 8:48 ` Peter Zijlstra
2018-07-10 22:26 ` [RFC PATCH v2 12/27] x86/mm: Shadow stack page fault error checking Yu-cheng Yu
2018-07-10 22:52 ` Dave Hansen
2018-07-11 17:28 ` Yu-cheng Yu
2018-07-10 23:24 ` Dave Hansen
2018-07-10 22:26 ` [RFC PATCH v2 13/27] mm: Handle shadow stack page fault Yu-cheng Yu
2018-07-10 23:06 ` Dave Hansen
2018-07-11 9:06 ` Peter Zijlstra
2018-08-14 21:28 ` Yu-cheng Yu
2018-07-10 22:26 ` [RFC PATCH v2 14/27] mm: Handle THP/HugeTLB " Yu-cheng Yu
2018-07-10 23:08 ` Dave Hansen
2018-07-11 9:10 ` Peter Zijlstra
2018-07-11 16:11 ` Yu-cheng Yu
2018-07-20 14:20 ` Dave Hansen
2018-07-20 14:58 ` Yu-cheng Yu
2018-07-10 22:26 ` [RFC PATCH v2 15/27] mm/mprotect: Prevent mprotect from changing shadow stack Yu-cheng Yu
2018-07-10 23:10 ` Dave Hansen
2018-07-11 9:12 ` Peter Zijlstra
2018-07-11 16:07 ` Yu-cheng Yu
2018-07-11 16:22 ` Dave Hansen
2018-07-10 22:26 ` [RFC PATCH v2 16/27] mm: Modify can_follow_write_pte/pmd for " Yu-cheng Yu
2018-07-10 23:37 ` Dave Hansen
2018-07-11 17:05 ` Yu-cheng Yu
2018-07-13 18:26 ` Dave Hansen
2018-07-17 23:03 ` Yu-cheng Yu
2018-07-17 23:11 ` Dave Hansen
2018-07-17 23:15 ` Dave Hansen
2018-07-18 20:14 ` Yu-cheng Yu
2018-07-18 21:45 ` Dave Hansen
2018-07-18 23:10 ` Yu-cheng Yu
2018-07-19 0:06 ` Dave Hansen
2018-07-19 17:06 ` Yu-cheng Yu
2018-07-19 19:31 ` Dave Hansen
2018-07-11 9:29 ` Peter Zijlstra
2018-07-17 23:00 ` Yu-cheng Yu
2018-07-10 22:26 ` [RFC PATCH v2 17/27] x86/cet/shstk: User-mode shadow stack support Yu-cheng Yu
2018-07-10 23:40 ` Dave Hansen
2018-07-11 9:34 ` Peter Zijlstra
2018-07-11 15:45 ` Yu-cheng Yu
2018-07-11 9:36 ` Peter Zijlstra
2018-07-11 21:10 ` Jann Horn
2018-07-11 21:34 ` Andy Lutomirski
2018-07-11 21:51 ` Jann Horn
2018-07-11 22:21 ` Andy Lutomirski
2018-07-13 18:03 ` Yu-cheng Yu
2018-07-10 22:26 ` [RFC PATCH v2 18/27] x86/cet/shstk: Introduce WRUSS instruction Yu-cheng Yu
2018-07-10 23:48 ` Dave Hansen
2018-07-12 22:59 ` Yu-cheng Yu
2018-07-12 23:49 ` Dave Hansen
2018-07-13 1:50 ` Dave Hansen
2018-07-13 2:21 ` Andy Lutomirski
2018-07-13 4:16 ` Dave Hansen
2018-07-13 4:18 ` Dave Hansen
2018-07-13 17:39 ` Yu-cheng Yu
2018-07-13 5:55 ` Andy Lutomirski
2018-07-11 9:44 ` Peter Zijlstra
2018-07-11 15:06 ` Yu-cheng Yu
2018-07-11 15:30 ` Peter Zijlstra
2018-07-11 9:45 ` Peter Zijlstra
2018-07-11 14:58 ` Yu-cheng Yu
2018-07-11 15:27 ` Peter Zijlstra
2018-07-11 15:41 ` Yu-cheng Yu
2018-07-13 12:12 ` Dave Hansen
2018-07-13 17:37 ` Yu-cheng Yu
2018-07-10 22:26 ` [RFC PATCH v2 19/27] x86/cet/shstk: Signal handling for shadow stack Yu-cheng Yu
2018-07-10 22:26 ` [RFC PATCH v2 20/27] x86/cet/shstk: ELF header parsing of CET Yu-cheng Yu
2018-07-11 11:12 ` Florian Weimer
2018-07-11 19:37 ` Jann Horn
2018-07-11 20:53 ` Yu-cheng Yu
2018-07-10 22:26 ` [RFC PATCH v2 21/27] x86/cet/ibt: Add Kconfig option for user-mode Indirect Branch Tracking Yu-cheng Yu
2018-07-10 22:26 ` [RFC PATCH v2 22/27] x86/cet/ibt: User-mode indirect branch tracking support Yu-cheng Yu
2018-07-11 0:11 ` Dave Hansen
2018-07-11 22:10 ` Yu-cheng Yu
2018-07-11 22:40 ` Dave Hansen
2018-07-11 23:00 ` Yu-cheng Yu
2018-07-11 23:16 ` Dave Hansen
2018-07-13 17:56 ` Yu-cheng Yu
2018-07-13 18:05 ` Dave Hansen
2018-07-11 21:07 ` Jann Horn
2018-07-10 22:26 ` [RFC PATCH v2 23/27] mm/mmap: Add IBT bitmap size to address space limit check Yu-cheng Yu
2018-07-10 23:57 ` Dave Hansen
2018-07-11 16:56 ` Yu-cheng Yu
2018-07-10 22:26 ` [RFC PATCH v2 24/27] x86: Insert endbr32/endbr64 to vDSO Yu-cheng Yu
2018-07-10 22:26 ` [RFC PATCH v2 25/27] x86/cet: Add PTRACE interface for CET Yu-cheng Yu
2018-07-11 10:20 ` Ingo Molnar
2018-07-11 15:40 ` Yu-cheng Yu [this message]
2018-07-12 14:03 ` Ingo Molnar
2018-07-12 22:37 ` Yu-cheng Yu
2018-07-12 23:08 ` Thomas Gleixner
2018-07-13 16:07 ` Yu-cheng Yu
2018-07-13 6:28 ` Pavel Machek
2018-07-13 13:33 ` Ingo Molnar
2018-07-14 6:27 ` Pavel Machek
2018-07-10 22:26 ` [RFC PATCH v2 26/27] x86/cet/shstk: Handle thread shadow stack Yu-cheng Yu
2018-07-10 22:26 ` [RFC PATCH v2 27/27] x86/cet: Add arch_prctl functions for CET Yu-cheng Yu
2018-07-11 12:19 ` Florian Weimer
2018-07-11 21:02 ` Yu-cheng Yu
2018-07-11 19:45 ` Jann Horn
2018-07-11 20:55 ` Yu-cheng Yu
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