linux-kernel - [PATCH][RESEND] x86/mm: Harden copy_from_kernel_nofault

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Message-ID: <20250407091054.198057-1-snishika@redhat.com>
Date: Mon,  7 Apr 2025 18:10:52 +0900
From: Seiji Nishikawa <snishika@...hat.com>
To: dave.hansen@...ux.intel.com,
	luto@...nel.org,
	peterz@...radead.org
Cc: linux-kernel@...r.kernel.org,
	snishika@...hat.com
Subject: [PATCH][RESEND] x86/mm: Harden copy_from_kernel_nofault_allowed() to prevent false MCEs'

Hello,

I’m following up on the patch I submitted on February 5th:
 https://lore.kernel.org/lkml/20250205065336.440890-1-snishika@redhat.com

It’s been over 8 weeks, and I haven’t received any feedback. Just wanted to check whether this was overlooked, or if any comments or suggestions are pending.

The patch not only covers addresses within the VSYSCALL_ADDR + PAGE_SIZE range as before, but also includes misaligned addresses from the 4 pages below it, to catch misaligned or speculative accesses that might otherwise bypass the existing check.

If this approach seems inappropriate or there’s a preferred alternative, I’d really appreciate your guidance.

Thanks in advance for your time and feedback.

Best regards,  
Seiji Nishikawa