From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=95.215.58.71 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794394248; b=eGQ8DRS/UehMU3OshKlv9DoNwLxtobyN8CDBWglkRTf7JGk4+vQ13n8pN+wCwOAIlVA7 JVE0KCkJWFFjt2cZwVqcn9XEk2+eIf0MQR+FM6KSBF7Lfs7/ql49NZNRcCWvRbnwN/Yy9 62i1iZwmmgOxmuA3a8TfvAykdljdMjfbtPr0TLUlNS8UMLDAiSt1UWBQc0KqK9vqVzYRX Pb2WZhtrjm41ZukhtHcCPZG2LHMH1+QFQpWC1oBnU271JFrYPVSKMsw6OSdWony89ujDc JGNBPUQDQqs/Yc5ZBxwP93kRmrZPojE66UxwLcTmIFwIuCSn/HcTWaX7AoA4O1NZE+g== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794394248; h=DMARC-Filter:X-Envelope-To:DKIM-Signature:X-Envelope-To:Received: X-Mizu-Trace-ID:X-Migadu-Flow:From:To:Cc:Subject:Date:Message-ID: X-Mailer:In-Reply-To:References:MIME-Version:Content-Type: Content-Transfer-Encoding; bh=j/Qyg1UyMf8yIhlGF9VG32ssBLq84ZvPcoVqm2IS3x8=; b=AgUJwsAOO8lbzUnf08tFpd+GPFvYJNGle0klkdXa6/FUGLFQgy6XmaBtaNfZyZR6Ob8d HqaVx+nAi1oftN62RYHf4m0w7EegDXfxIaNuIW5MvxkX/4zxJztrkM0RxvnYllaZYKYbT RlTFVhD7rQyVWBbx8fVA8pL1V9HD1TMr0bSwmdTy5zQo4dS27kC3XLHEgkGMFy9vD8PfS J0rzRZwzKUXfWovUgLquQAfxGKfbOqz33nFAaOFKB8mmJiHFWHZLU6/FGCbSPQZoeIyhk A0rHSvuvDMNKPEyRCrzDMolgffOURvg7Hoh0TyYunOmFD3zGMWy9y20hkIGa5tn3wpA== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=ORypB0v0; arc=none smtp.remote-ip=95.215.58.71 Received: from mta1.migadu.com (out-71.mta1.migadu.com [95.215.58.71]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7D5F5606A326 for ; Wed, 11 Nov 2026 10:50:47 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 7D5F5606A326 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=ORypB0v0 X-Envelope-To: stable@vger.kernel.org DKIM-Signature: a=rsa-sha256; bh=UfTczrnCMjiFHwHorGJcb8GhQ4eklNGiv8MK9V3Ny84=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1794394245; v=1; x=1794999045; b=ORypB0v001MkwS8fumOipnttyLz+lRBx00dG86O5RCypz+ePzNLYrRRg6VHpu7RCavrAh5kG e+CQjUt7KFxO8Vm8qI+Coe9MtUkedf513wHWQzyrYJmqsiX/gZYbW/0MQQrWYBoqjQHfOq/q9XF LejYt9rK4T+zqhLRaps6Bhsc= X-Envelope-To: stable@vger.kernel.org Received: by smtp.migadu.com with ESMTPS id 4dd8d3a39f7a78f4; Wed, 11 Nov 2026 10:50:45 +0000 X-Mizu-Trace-ID: 4dd8d3a39f7a78f4 X-Migadu-Flow: FLOW_OUT From: Lance Yang To: stable@vger.kernel.org, sashal@kernel.org Cc: Andrea Arcangeli , Hugh Dickins , Jason Gunthorpe , John Hubbard , "Matthew Wilcox (Oracle)" , Shuah Khan , Vlastimil Babka , Mel Gorman , Xu Xin , Chengming Zhou , "Liam R. Howlett" , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , =?UTF-8?q?J=C3=A9r=C3=B4me=20Glisse?= , Peter Xu , Bobby Powers , Brian Geffon , Denis Plotnikov , Doug Gilbert , Johannes Weiner , Martin Cracauer , Marty McFadden , Maya Gokhale , Pavel Emelyanov , Rik van Riel , Shaohua Li , James Houghton , Jonathan Corbet , Paolo Bonzini , Sean Christopherson , SJ Park , Zi Yan , Mohammed EL Kadiri , David Hildenbrand Subject: [PATCH 6.1.y 0/3] mm/ksm: fix userfaultfd protection on 6.1 Date: Wed, 11 Nov 2026 18:50:31 +0800 Message-ID: <20261111105034.51632-1-lance.yang@linux.dev> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20261109201707-failed-6.1-990d6c2194a9@kernel.org> References: <20261109201707-failed-6.1-990d6c2194a9@kernel.org> X-Mailing-List: stable@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Hi Sasha, Could we take David's two KSM patches first for 6.1.y? Both cherry-pick cleanly. 6.1 already has FAULT_FLAG_UNSHARE, but KSM still breaks COW with a fake write fault. Patch 2 needs patch 1, and patch 3 needs both. Thanks, Lance Cc: Andrea Arcangeli Cc: Hugh Dickins Cc: Jason Gunthorpe Cc: John Hubbard Cc: Matthew Wilcox (Oracle) Cc: Shuah Khan Cc: Vlastimil Babka Cc: Mel Gorman Cc: Xu Xin Cc: Chengming Zhou Cc: Liam R. Howlett Cc: Mike Rapoport Cc: Suren Baghdasaryan Cc: Michal Hocko Cc: Jérôme Glisse Cc: Peter Xu Cc: Bobby Powers Cc: Brian Geffon Cc: Denis Plotnikov Cc: Doug Gilbert Cc: Johannes Weiner Cc: Martin Cracauer Cc: Marty McFadden Cc: Maya Gokhale Cc: Pavel Emelyanov Cc: Rik van Riel Cc: Shaohua Li Cc: James Houghton Cc: Jonathan Corbet Cc: Paolo Bonzini Cc: Sean Christopherson Cc: SJ Park Cc: Zi Yan Cc: Mohammed EL Kadiri Cc: David Hildenbrand David Hildenbrand (2): mm/ksm: simplify break_ksm() to not rely on VM_FAULT_WRITE mm/ksm: fix KSM COW breaking with userfaultfd-wp via FAULT_FLAG_UNSHARE Lance Yang (1): mm/ksm: fix userfaultfd protection during merge and unmerge mm/ksm.c | 39 +++++++++++++++++++++------------------ 1 file changed, 21 insertions(+), 18 deletions(-) -- 2.49.0