From: David Laight <david.laight.linux@gmail.com>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Sohil Mehta <sohil.mehta@intel.com>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Andy Lutomirski <luto@kernel.org>,
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Subject: Re: [PATCHv8 14/17] x86/traps: Handle LASS thrown #SS
Date: Sun, 6 Jul 2025 10:22:13 +0100 [thread overview]
Message-ID: <20250706102213.4ab365d7@pumpkin> (raw)
In-Reply-To: <4DE45AFD-C1E0-4FB8-BE01-44A72C5C6E1E@zytor.com>
On Tue, 01 Jul 2025 19:06:10 -0700
"H. Peter Anvin" <hpa@zytor.com> wrote:
...
> Note: for a FRED system, ERETU can generate #SS for a non-canonical user space
> RSP even in the absence of LASS, so if that is not currently handled that is an active bug.
Is that a fault in kernel space, or a fault in user space.
Some of the traps for 'iret' happen after the transition to user space,
so the kernel doesn't have to handle them as special cases.
(I simplified (and fixed) one version of that code.)
David
next prev parent reply other threads:[~2025-07-06 9:22 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-07-01 9:58 [PATCHv8 00/17] x86: Enable Linear Address Space Separation support Kirill A. Shutemov
2025-07-01 9:58 ` [PATCHv8 01/17] x86/cpu: Enumerate the LASS feature bits Kirill A. Shutemov
2025-07-01 9:58 ` [PATCHv8 02/17] x86/asm: Introduce inline memcpy and memset Kirill A. Shutemov
2025-07-03 8:44 ` David Laight
2025-07-03 10:39 ` Kirill A. Shutemov
2025-07-03 12:15 ` David Laight
2025-07-03 13:33 ` Vegard Nossum
2025-07-03 16:52 ` David Laight
2025-07-03 14:10 ` Kirill A. Shutemov
2025-07-03 17:02 ` David Laight
2025-07-03 17:13 ` Dave Hansen
2025-07-04 9:04 ` Kirill A. Shutemov
2025-07-06 9:13 ` David Laight
2025-07-07 8:02 ` Kirill A. Shutemov
2025-07-07 9:33 ` David Laight
2025-07-01 9:58 ` [PATCHv8 03/17] x86/alternatives: Disable LASS when patching kernel alternatives Kirill A. Shutemov
2025-07-01 18:44 ` Sohil Mehta
2025-07-01 9:58 ` [PATCHv8 04/17] x86/cpu: Defer CR pinning setup until after EFI initialization Kirill A. Shutemov
2025-07-01 19:03 ` Sohil Mehta
2025-07-02 9:47 ` Kirill A. Shutemov
2025-07-01 23:10 ` Dave Hansen
2025-07-02 10:05 ` Kirill A. Shutemov
2025-07-04 12:23 ` Kirill A. Shutemov
2025-07-01 9:58 ` [PATCHv8 05/17] efi: Disable LASS around set_virtual_address_map() EFI call Kirill A. Shutemov
2025-07-01 9:58 ` [PATCHv8 06/17] x86/vsyscall: Do not require X86_PF_INSTR to emulate vsyscall Kirill A. Shutemov
2025-07-01 9:58 ` [PATCHv8 07/17] x86/vsyscall: Reorganize the #PF emulation code Kirill A. Shutemov
2025-07-01 9:58 ` [PATCHv8 08/17] x86/traps: Consolidate user fixups in exc_general_protection() Kirill A. Shutemov
2025-07-01 9:58 ` [PATCHv8 09/17] x86/vsyscall: Add vsyscall emulation for #GP Kirill A. Shutemov
2025-07-01 9:58 ` [PATCHv8 10/17] x86/vsyscall: Disable LASS if vsyscall mode is set to EMULATE Kirill A. Shutemov
2025-07-01 9:58 ` [PATCHv8 11/17] x86/cpu: Set LASS CR4 bit as pinning sensitive Kirill A. Shutemov
2025-07-01 22:51 ` Sohil Mehta
2025-07-01 9:58 ` [PATCHv8 12/17] x86/traps: Communicate a LASS violation in #GP message Kirill A. Shutemov
2025-07-02 0:36 ` Sohil Mehta
2025-07-02 10:10 ` Kirill A. Shutemov
2025-07-01 9:58 ` [PATCHv8 13/17] x86/traps: Generalize #GP address decode and hint code Kirill A. Shutemov
2025-07-02 0:54 ` Sohil Mehta
2025-07-01 9:58 ` [PATCHv8 14/17] x86/traps: Handle LASS thrown #SS Kirill A. Shutemov
2025-07-02 1:35 ` Sohil Mehta
2025-07-02 2:00 ` H. Peter Anvin
2025-07-02 2:06 ` H. Peter Anvin
2025-07-02 10:17 ` Kirill A. Shutemov
2025-07-02 14:37 ` H. Peter Anvin
2025-07-02 14:47 ` Kirill A. Shutemov
2025-07-02 17:10 ` H. Peter Anvin
2025-07-02 23:42 ` Andrew Cooper
2025-07-03 0:44 ` H. Peter Anvin
2025-07-06 9:22 ` David Laight [this message]
2025-07-06 15:07 ` H. Peter Anvin
2025-07-02 13:27 ` Kirill A. Shutemov
2025-07-02 17:56 ` Sohil Mehta
2025-07-03 10:40 ` Kirill A. Shutemov
2025-07-02 20:05 ` Sohil Mehta
2025-07-03 11:31 ` Kirill A. Shutemov
2025-07-03 20:12 ` Sohil Mehta
2025-07-04 9:23 ` Kirill A. Shutemov
2025-07-01 9:58 ` [PATCHv8 15/17] x86/cpu: Make LAM depend on LASS Kirill A. Shutemov
2025-07-01 23:03 ` Sohil Mehta
2025-07-01 9:58 ` [PATCHv8 16/17] x86/cpu: Enable LASS during CPU initialization Kirill A. Shutemov
2025-07-01 9:58 ` [PATCHv8 17/17] x86: Re-enable Linear Address Masking Kirill A. Shutemov
2025-07-01 23:13 ` Sohil Mehta
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