From nobody Wed Dec 24 12:20:59 2025 Received: from mail-m49197.qiye.163.com (mail-m49197.qiye.163.com [45.254.49.197]) (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 E181A1B940 for ; Fri, 26 Jan 2024 13:22:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.254.49.197 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706275384; cv=none; b=nXQBNXajGqLuMzdzI815GgBTXxnMo2WbL0qj7qyMTOwRoAgN1vr7065MXYj6rGD9BJCAxTvUjB9SDH9RtT0QgvxXa4dTuUiHucAtdpHAaJ5XfH6SGQ9KPtwyfM6MDC7FrDFXWS1D3M+F0M/BErTKubuPCs+PtRRQJ7PC9rIpxKA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706275384; c=relaxed/simple; bh=iHHNC/KB9/++EkjfGa817hv7W5M7/4V/utIeoP4fako=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=tCVsQ7Aow3xACOBpCsal+5s5aX7kgKJaxMcf9dAthDaD94LglBvwyIAv4D8+3N9oBXQvnQmPzNyg3TrCa5+rQkJ9dmPm059u+MzhD5cMF4SQWr0ko6MPxNVXF4R3+JXRLdjTiGQZb8Lg7HPSGf+8xp8lp68s3T2koQ1Tjm2IZb0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=ustc.edu; spf=pass smtp.mailfrom=ustc.edu; arc=none smtp.client-ip=45.254.49.197 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=ustc.edu Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=ustc.edu Received: from localhost.localdomain (unknown [61.151.228.146]) by smtp.qiye.163.com (Hmail) with ESMTPA id 84CB97E011A; Fri, 26 Jan 2024 21:22:44 +0800 (CST) From: Chunsheng Luo To: akpm@linux-foundation.org Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Chunsheng Luo Subject: [PATCH] mempolicy: check home_node is in the nodes of policy Date: Fri, 26 Jan 2024 08:22:40 -0500 Message-ID: <20240126132240.24518-1-luochunsheng@ustc.edu> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-HM-Spam-Status: e1kfGhgUHx5ZQUpXWQgPGg8OCBgUHx5ZQUlOS1dZFg8aDwILHllBWSg2Ly tZV1koWUFITzdXWS1ZQUlXWQ8JGhUIEh9ZQVlDQk0YVkpPShlMTE4YTUhOSFUTARMWGhIXJBQOD1 lXWRgSC1lBWU1KVUpOSlVJSUNVSk9NWVdZFhoPEhUdFFlBWU9LSFVKSktISkNVSktLVUtZBg++ X-HM-Tid: 0a8d45efdf7703a2kunm84cb97e011a X-HM-MType: 10 X-HM-Sender-Digest: e1kMHhlZQR0aFwgeV1kSHx4VD1lBWUc6Mz46TBw5LjMKNg0QLREjHQ8V PzgaFEpVSlVKTEtNSUxOSE1OSk9LVTMWGhIXVRcOFBgTDhUIEx4VHDsOCA8YVR4fDkVZV1kSC1lB WU1KVUpOSlVJSUNVSk9NWVdZCAFZQUpPQkI3Bg++ Content-Type: text/plain; charset="utf-8" set_mempolicy_home_node should be used after setting the memory policy. If the home_node isn't in the nodes of policy, we should return failure to avoid misunderstanding. Signed-off-by: Chunsheng Luo --- mm/mempolicy.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 10a590ee1c89..9282be2ae18e 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -1536,6 +1536,12 @@ SYSCALL_DEFINE4(set_mempolicy_home_node, unsigned lo= ng, start, unsigned long, le err =3D -EOPNOTSUPP; break; } + + if (!node_isset(home_node, old->nodes)) { + err =3D -EINVAL; + break; + } + new =3D mpol_dup(old); if (IS_ERR(new)) { err =3D PTR_ERR(new); --=20 2.43.0