linux-kernel - Re: [PATCH v3] powerpc, mm: Fix mprotect on book3s 32-bit

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <176388153643.266380.17169073097404532999.b4-ty@linux.ibm.com>
Date: Sun, 23 Nov 2025 12:38:42 +0530
From: Madhavan Srinivasan <maddy@...ux.ibm.com>
To: Michael Ellerman <mpe@...erman.id.au>, Nicholas Piggin <npiggin@...il.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Nadav Amit <nadav.amit@...il.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Ritesh Harjani <ritesh.list@...il.com>,
        Dave Vasilevsky <dave@...ilevsky.ca>
Cc: linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v3] powerpc, mm: Fix mprotect on book3s 32-bit

On Sun, 16 Nov 2025 01:40:46 -0500, Dave Vasilevsky wrote:
> On 32-bit book3s with hash-MMUs, tlb_flush() was a no-op. This was
> unnoticed because all uses until recently were for unmaps, and thus
> handled by __tlb_remove_tlb_entry().
> 
> After commit 4a18419f71cd ("mm/mprotect: use mmu_gather") in kernel 5.19,
> tlb_gather_mmu() started being used for mprotect as well. This caused
> mprotect to simply not work on these machines:
> 
> [...]

Applied to powerpc/next.

[1/1] powerpc, mm: Fix mprotect on book3s 32-bit
      https://git.kernel.org/powerpc/c/78fc63ffa7813e33681839bb33826c24195f0eb7

cheers