From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CD9983E9589; Mon, 13 Jul 2026 11:40:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783942817; cv=none; b=qzanJowMou2S46gQd+mygO3utQ0Qgnn7nEQ+K/5K4f1KUj+vwIpZfG2H47wPfr1rJGqdoO2pR77uX+VSlCxE4LBRqigkR5HC2LGIY9wjfoWMzZAQ2893Zcu8ZlC0o5U1hNidZuPB9KYGChOx0DmS3dueaS3FZg5bWVWNyYRgV9Y= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783942817; c=relaxed/simple; bh=5G0pdP3C+y8EI2GvrAKyQZ37vcepjzGADhYTGQ8PJ6E=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=Xvab+H8KLJI799tZYjGd+5/fRe9gRQngIQXtI0ga5DG/1ZHMDf76beb7p8+F/7sn4HHlD/+eUL823Ivf4VOLMdj5nuyBCYAvidVL/32GXyNGk4cV3nPeVWjx1Fx85enMbpXXBpG8OyKrg5yeRTiOoin439MMr2YnrkjWf0g28Hg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=dZGRJauI; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="dZGRJauI" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7A9A41F000E9; Mon, 13 Jul 2026 11:40:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1783942816; bh=OCUhcyiwWTmu8QeEJQt1vja0HsbAMaRlJMAEe2Y7DeE=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=dZGRJauIXmFXIXVKASyA43gR9V2NS35VztGQ8qQBxwH8LNdZxq9XD4tytbLxkdY0n B8D/j/tVmRYXiqNFMDWprsqF4C8N/3yT0IGtZC0WViv0Hy5j2DtOrzlO3v1SVEqURF aKZlD64LLIeCcBPb97NqITp5YwBE8GPonzWR8Y7HP1uRC8V2ZwNcmgO6zQst2vzSDQ bUw4pXb9RBEtnyNT00GtkuXO5eCdq/PnU4JxH6o+9qa25c+6C4tJXsww2lKsULk5ei hMUFiw2xJMIXnlL/MOUBqO9VvQPb3J30DdctzBG7xOoUEJCM66BlhH5cq7Hi7LCGwd xEpAPa9EOjiJw== Date: Mon, 13 Jul 2026 12:40:08 +0100 From: Will Deacon To: Lorenzo Stoakes Cc: Andrew Morton , Suren Baghdasaryan , "Liam R. Howlett" , Vlastimil Babka , Shakeel Butt , David Hildenbrand , Mike Rapoport , Michal Hocko , Uladzislau Rezki , Toshi Kani , Dave Hansen , Andy Lutomirski , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, "H. Peter Anvin" , Kiryl Shutsemau , Catalin Marinas , Dev Jain , Ryan Roberts , David Carlier , linux-mm@kvack.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, linux-arm-kernel@lists.infradead.org, stable@vger.kernel.org Subject: Re: [PATCH mm-hotfixes v2 4/4] arm64: remove redundant concurrent ptdump UAF mitigation Message-ID: References: <20260712-series-vmap-race-fix-v2-0-ad134cc3a12a@kernel.org> <20260712-series-vmap-race-fix-v2-4-ad134cc3a12a@kernel.org> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260712-series-vmap-race-fix-v2-4-ad134cc3a12a@kernel.org> On Sun, Jul 12, 2026 at 11:42:27AM +0100, Lorenzo Stoakes wrote: > This partially reverts commit fa93b45fd397 ("arm64: Enable vmalloc-huge > with ptdump"), retaining vmalloc-huge support but eliminating the now > redundant mitigation against a race between huge vmap page table freeing > and ptdump, as this issue has now been fixed at core. > > We also simultaneously remove the arm64 if-deffery when acquiring the mmap > read lock upon vmap huge page table promotion as it is no longer required. > > Note that this patch relies on the preceding vmalloc patch, and should not > be backported alone. > > Fixes: fa93b45fd397 ("arm64: Enable vmalloc-huge with ptdump") > Cc: stable@vger.kernel.org > Reviewed-by: Dev Jain > Acked-by: Mike Rapoport (Microsoft) > Signed-off-by: Lorenzo Stoakes > --- > arch/arm64/include/asm/ptdump.h | 2 -- > arch/arm64/mm/mmu.c | 43 ++++------------------------------------- > arch/arm64/mm/ptdump.c | 11 ++--------- > mm/vmalloc.c | 15 +++----------- > 4 files changed, 9 insertions(+), 62 deletions(-) Acked-by: Will Deacon Will