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From: Gerd Hoffmann <kraxel@redhat.com>
To: Borislav Petkov <bp@alien8.de>
Cc: Evgeniy Baskov <baskov@ispras.ru>,
	Ard Biesheuvel <ardb@kernel.org>,
	Andy Lutomirski <luto@kernel.org>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Ingo Molnar <mingo@redhat.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Alexey Khoroshilov <khoroshilov@ispras.ru>,
	Peter Jones <pjones@redhat.com>,
	"Limonciello, Mario" <mario.limonciello@amd.com>,
	joeyli <jlee@suse.com>,
	lvc-project@linuxtesting.org, x86@kernel.org,
	linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-hardening@vger.kernel.org
Subject: Re: [PATCH v5 02/27] x86/build: Remove RWX sections and align on 4KB
Date: Thu, 6 Apr 2023 13:42:00 +0200	[thread overview]
Message-ID: <x244aglrxdjgudpkp5uwnbsft5vorgvmztqlnrwdiiobyj5srx@3ewfdpiuatkq> (raw)
In-Reply-To: <20230405174059.GEZC2yq9WiXFsICyEy@fat_crate.local>

  Hi,

> > Currently paging is disabled in x86_32 in compressed kernel, so
> > protection is not applied anyways, but .init code was incorrectly
> > placed in non-executable ".data" segment. This should not change
> > anything meaningful in memory layout now, but might be required in case
> > memory protection will also be implemented in compressed kernel for
> > x86_32.
> 
> I highly doubt that - no one cares about 32-bit x86 anymore.

Indeed.  ia32 edk2 runs without paging even in latest tianocore/edk2,
and I don't expect that to change until ia32 support gets removed.

take care,
  Gerd


  reply	other threads:[~2023-04-06 11:58 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-03-14 10:13 [PATCH v5 00/27] x86_64: Improvements at compressed kernel stage Evgeniy Baskov
2023-03-14 10:13 ` [PATCH v5 01/27] x86/boot: Align vmlinuz sections on page size Evgeniy Baskov
2023-04-05 17:13   ` Borislav Petkov
2023-04-08 15:03     ` Evgeniy Baskov
2023-03-14 10:13 ` [PATCH v5 02/27] x86/build: Remove RWX sections and align on 4KB Evgeniy Baskov
2023-04-05 17:40   ` Borislav Petkov
2023-04-06 11:42     ` Gerd Hoffmann [this message]
2023-04-08 15:05     ` Evgeniy Baskov
2023-03-14 10:13 ` [PATCH v5 03/27] x86/boot: Set cr0 to known state in trampoline Evgeniy Baskov
2023-04-05 17:54   ` Borislav Petkov
2023-04-08 15:09     ` Evgeniy Baskov
2023-03-14 10:13 ` [PATCH v5 04/27] x86/boot: Increase boot page table size Evgeniy Baskov
2023-03-14 10:13 ` [PATCH v5 05/27] x86/boot: Support 4KB pages for identity mapping Evgeniy Baskov
2023-03-14 10:13 ` [PATCH v5 06/27] x86/boot: Setup memory protection for bzImage code Evgeniy Baskov
2023-03-14 10:13 ` [PATCH v5 07/27] x86/build: Check W^X of vmlinux during build Evgeniy Baskov
2023-03-14 10:13 ` [PATCH v5 08/27] x86/boot: Map memory explicitly Evgeniy Baskov
2023-03-14 10:13 ` [PATCH v5 09/27] x86/boot: Remove mapping from page fault handler Evgeniy Baskov
2023-03-14 20:33   ` Andy Lutomirski
2023-03-15 13:25     ` Evgeniy Baskov
2023-03-14 10:13 ` [PATCH v5 10/27] efi/libstub: Move helper function to related file Evgeniy Baskov
2023-03-14 10:13 ` [PATCH v5 11/27] x86/boot: Make console interface more abstract Evgeniy Baskov
2023-03-14 10:13 ` [PATCH v5 12/27] x86/boot: Make kernel_add_identity_map() a pointer Evgeniy Baskov
2023-03-14 10:13 ` [PATCH v5 13/27] x86/boot: Split trampoline and pt init code Evgeniy Baskov
2023-03-14 10:13 ` [PATCH v5 14/27] x86/boot: Add EFI kernel extraction interface Evgeniy Baskov
2023-03-14 10:13 ` [PATCH v5 15/27] efi/x86: Support extracting kernel from libstub Evgeniy Baskov
2023-03-14 10:13 ` [PATCH v5 16/27] x86/boot: Reduce lower limit of physical KASLR Evgeniy Baskov
2023-03-14 10:13 ` [PATCH v5 17/27] x86: decompressor: Remove the 'bugger off' message Evgeniy Baskov
2023-03-14 10:13 ` [PATCH v5 18/27] tools/include: Add simplified version of pe.h Evgeniy Baskov
2023-03-14 10:13 ` [PATCH v5 19/27] x86/build: Cleanup tools/build.c Evgeniy Baskov
2023-03-14 10:13 ` [PATCH v5 20/27] efi: x86: Use private copy of struct setup_header Evgeniy Baskov
2023-03-14 10:13 ` [PATCH v5 21/27] x86/build: Add SETUP_HEADER_OFFSET constant Evgeniy Baskov
2023-03-14 10:13 ` [PATCH v5 22/27] x86/build: set type_of_loader for EFISTUB Evgeniy Baskov
2023-03-14 10:13 ` [PATCH v5 23/27] efi/libstub: Don't set ramdisk_image/ramdisk_size Evgeniy Baskov
2023-03-14 10:13 ` [PATCH v5 24/27] x86/build: Make generated PE more spec compliant Evgeniy Baskov
2023-03-14 10:13 ` [PATCH v5 25/27] efi/libstub: Use memory attribute protocol Evgeniy Baskov
2023-03-14 10:13 ` [PATCH v5 26/27] efi/libstub: make memory protection warnings include newlines Evgeniy Baskov
2023-03-14 10:13 ` [PATCH v5 27/27] efi/x86: don't try to set page attributes on 0-sized regions Evgeniy Baskov
2023-03-14 21:23 ` [PATCH v5 00/27] x86_64: Improvements at compressed kernel stage Andy Lutomirski
2023-03-14 23:20   ` Andy Lutomirski
2023-03-15  9:04     ` Gerd Hoffmann
2023-03-15 17:57     ` Peter Jones
2023-04-05 16:17       ` Borislav Petkov
2023-03-15 13:25   ` Evgeniy Baskov

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