From: Segher Boessenkool <segher@kernel.crashing.org>
To: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
Cc: Nick Desaulniers <ndesaulniers@google.com>,
Alexandre Chartre <alexandre.chartre@oracle.com>,
kbuild-all@lists.01.org,
clang-built-linux <clang-built-linux@googlegroups.com>,
linux-toolchains@vger.kernel.org,
kernel test robot <lkp@intel.com>,
Arvind Sankar <nivedita@alum.mit.edu>,
Ard Biesheuvel <ardb@kernel.org>
Subject: Re: [RFC][PATCH 21/24] x86/entry: Disable stack-protector for IST entry C handlers
Date: Fri, 13 Nov 2020 18:26:24 -0600 [thread overview]
Message-ID: <20201114002624.GX2672@gate.crashing.org> (raw)
In-Reply-To: <CANiq72nKMd_BOOowqowLAn0PZ5tu7X8G=8OrpG34qYHGLDGw6Q@mail.gmail.com>
On Sat, Nov 14, 2020 at 01:01:42AM +0100, Miguel Ojeda wrote:
> On Sat, Nov 14, 2020 at 12:48 AM Segher Boessenkool
> <segher@kernel.crashing.org> wrote:
> >
> > Like *all* GCC extensions.
>
> They might not be standard, but they may be portable enough for the
> compilers we care about.
Sure, they may be portable enough for some specific purpose :-)
But you cannot limit yourself to the greatest common denominator: the
kernel wants to use many features only available on newer compiler
versions, too; this is no different.
Segher
next prev parent reply other threads:[~2020-11-14 0:31 UTC|newest]
Thread overview: 69+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-09 14:44 [RFC][PATCH 00/24] x86/pti: Defer CR3 switch to C code Alexandre Chartre
2020-11-09 14:44 ` [RFC][PATCH 01/24] x86/syscall: Add wrapper for invoking syscall function Alexandre Chartre
2020-11-09 14:44 ` [RFC][PATCH 02/24] x86/entry: Update asm_call_on_stack to support more function arguments Alexandre Chartre
2020-11-09 14:44 ` [RFC][PATCH 03/24] x86/entry: Consolidate IST entry from userspace Alexandre Chartre
2020-11-09 14:44 ` [RFC][PATCH 04/24] x86/sev-es: Define a setup stack function for the VC idtentry Alexandre Chartre
2020-11-09 14:44 ` [RFC][PATCH 05/24] x86/entry: Implement ret_from_fork body with C code Alexandre Chartre
2020-11-10 16:24 ` kernel test robot
2020-11-15 21:26 ` kernel test robot
2020-11-15 21:34 ` kernel test robot
2020-11-09 14:44 ` [RFC][PATCH 06/24] x86/pti: Provide C variants of PTI switch CR3 macros Alexandre Chartre
2020-11-09 14:44 ` [RFC][PATCH 07/24] x86/entry: Fill ESPFIX stack using C code Alexandre Chartre
2020-11-10 16:52 ` kernel test robot
2020-11-09 14:44 ` [RFC][PATCH 08/24] x86/entry: Add C version of SWAPGS and SWAPGS_UNSAFE_STACK Alexandre Chartre
2020-11-09 19:55 ` Alexandre Chartre
2020-11-09 14:44 ` [RFC][PATCH 09/24] x86/entry: Add C version of paranoid_entry/exit Alexandre Chartre
2020-11-10 18:40 ` kernel test robot
2020-11-09 14:44 ` [RFC][PATCH 10/24] x86/pti: Introduce per-task PTI trampoline stack Alexandre Chartre
2020-11-09 14:44 ` [RFC][PATCH 11/24] x86/pti: Function to clone page-table entries from a specified mm Alexandre Chartre
2020-11-09 14:44 ` [RFC][PATCH 12/24] x86/pti: Function to map per-cpu page-table entry Alexandre Chartre
2020-11-09 14:44 ` [RFC][PATCH 13/24] x86/pti: Extend PTI user mappings Alexandre Chartre
2020-11-09 19:56 ` Alexandre Chartre
2020-11-10 23:39 ` Andy Lutomirski
2020-11-11 8:55 ` Alexandre Chartre
2020-11-13 8:48 ` kernel test robot
2020-11-09 14:44 ` [RFC][PATCH 14/24] x86/pti: Use PTI stack instead of trampoline stack Alexandre Chartre
2020-11-09 14:44 ` [RFC][PATCH 15/24] x86/pti: Execute syscall functions on the kernel stack Alexandre Chartre
2020-11-09 14:44 ` [RFC][PATCH 16/24] x86/pti: Execute IDT handlers " Alexandre Chartre
2020-11-09 14:44 ` [RFC][PATCH 17/24] x86/pti: Execute IDT handlers with error code " Alexandre Chartre
2020-11-09 14:44 ` [RFC][PATCH 18/24] x86/pti: Execute system vector handlers " Alexandre Chartre
2020-11-09 14:44 ` [RFC][PATCH 19/24] x86/pti: Execute page fault handler " Alexandre Chartre
2020-11-09 14:44 ` [RFC][PATCH 20/24] x86/pti: Execute NMI " Alexandre Chartre
2020-11-09 14:44 ` [RFC][PATCH 21/24] x86/entry: Disable stack-protector for IST entry C handlers Alexandre Chartre
2020-11-13 7:58 ` kernel test robot
2020-11-13 18:59 ` Nick Desaulniers
2020-11-13 18:59 ` Nick Desaulniers
2020-11-13 19:39 ` Alexandre Chartre
2020-11-13 19:39 ` Alexandre Chartre
2020-11-13 19:45 ` Nick Desaulniers
2020-11-13 19:45 ` Nick Desaulniers
2020-11-13 23:47 ` Segher Boessenkool
2020-11-14 0:01 ` Miguel Ojeda
2020-11-14 0:01 ` Miguel Ojeda
2020-11-14 0:26 ` Segher Boessenkool [this message]
2020-11-14 1:58 ` Miguel Ojeda
2020-11-14 1:58 ` Miguel Ojeda
2020-11-14 10:20 ` Ard Biesheuvel
2020-11-14 10:20 ` Ard Biesheuvel
2020-11-25 19:56 ` Kees Cook
2020-11-25 19:56 ` Kees Cook
2020-11-25 23:00 ` Segher Boessenkool
2020-11-26 6:40 ` Ard Biesheuvel
2020-11-26 6:40 ` Ard Biesheuvel
2020-11-26 20:22 ` Segher Boessenkool
2020-11-26 21:05 ` Arvind Sankar
2020-11-26 21:05 ` Arvind Sankar
2020-11-26 22:00 ` Ard Biesheuvel
2020-11-26 22:00 ` Ard Biesheuvel
2020-11-14 0:11 ` Nick Desaulniers
2020-11-14 0:11 ` Nick Desaulniers
2020-11-14 0:43 ` Segher Boessenkool
2020-11-14 0:48 ` Nick Desaulniers
2020-11-14 0:48 ` Nick Desaulniers
2020-11-09 14:44 ` [RFC][PATCH 22/24] x86/entry: Defer paranoid entry/exit to C code Alexandre Chartre
2020-11-15 22:51 ` kernel test robot
2020-11-09 14:44 ` [RFC][PATCH 23/24] x86/entry: Remove paranoid_entry and paranoid_exit Alexandre Chartre
2020-11-09 14:44 ` [RFC][PATCH 24/24] x86/pti: Defer CR3 switch to C code for non-IST and syscall entries Alexandre Chartre
2020-11-09 19:35 ` [RFC][PATCH 00/24] x86/pti: Defer CR3 switch to C code Dave Hansen
2020-11-09 19:53 ` Alexandre Chartre
-- strict thread matches above, loose matches on Subject: below --
2020-11-09 11:22 Alexandre Chartre
2020-11-09 11:23 ` [RFC][PATCH 21/24] x86/entry: Disable stack-protector for IST entry C handlers Alexandre Chartre
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