From nobody Fri Dec 19 19:56:49 2025 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (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 AEBBB1BE251 for ; Sun, 30 Mar 2025 12:17:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1743337062; cv=none; b=QeXLyKp+dC+XD+Kf2mzYYrAYxNLhXbC+0dc1F2+1zimjWj9ODuTp1Uc69tswP/VmhRTDT5Iwu3LJPYvijAAahSbVSkK1tpXCcIlAdwyM67mAi/bwiLHJgUiRLO7Z0hI/cX8RRJBlfUWXBZr9FN47+lNLnD1eDVxX5m5A+16t3Jw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1743337062; c=relaxed/simple; bh=Ng+GNrybUdI+BpZ9b0iCGTWyUpXKBhvvQS92NmSnUkM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-type; b=fyftU0UCMP9kY0ecAdGwL+IedXXfu3/IWH9g5SrMM30pF1J3R2cWaB1LmYkdIf6+xT+58/iX7L9iab+taVtcIph1JhMkxdy8o6Zd9LzeQnSNIosOD6oakgkZpcLR0GL2fOeMFygvvGjoM/7OsAABX3BejsEXLitArh6pIiC0REM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=b6RLiTQz; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="b6RLiTQz" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1743337059; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=0G+7enjJ3hUuHc8nn+ZMKDLjMZiATmJ3BHld8fzSZf8=; b=b6RLiTQz+MLGUMzHB1mQfKDhOShYRsK6a0vOEvkdfewN7t63f9KrkPpzqDQmUPBgdCg2rd wUxzqAv9hLNAlJrwIrwsO6eBIAQvFueHnlIfR1VuPj7JJu8V3VkYo8o9LWgd0UAT8PgPBj 4VrTmsJpg6WmxFsMwMSONT3FOK6vbRU= Received: from mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-554-fhcRkH7YOYeKvg-myRGkUg-1; Sun, 30 Mar 2025 08:17:36 -0400 X-MC-Unique: fhcRkH7YOYeKvg-myRGkUg-1 X-Mimecast-MFC-AGG-ID: fhcRkH7YOYeKvg-myRGkUg_1743337055 Received: from mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.111]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 0173E18004A9; Sun, 30 Mar 2025 12:17:35 +0000 (UTC) Received: from MiWiFi-R3L-srv.redhat.com (unknown [10.72.112.17]) by mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 2BD13180094A; Sun, 30 Mar 2025 12:17:31 +0000 (UTC) From: Baoquan He To: akpm@linux-foundation.org Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Baoquan He Subject: [PATCH 2/7] mm/gup: check if both GUP_GET and GUP_PIN are set in __get_user_pages() earlier Date: Sun, 30 Mar 2025 20:17:12 +0800 Message-ID: <20250330121718.175815-3-bhe@redhat.com> In-Reply-To: <20250330121718.175815-1-bhe@redhat.com> References: <20250330121718.175815-1-bhe@redhat.com> 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-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.111 Content-Type: text/plain; charset="utf-8" In __get_user_pages(), it will traverse page table and take a reference to the page the given user address corresponds to if GUP_GET or GUP_PIN is et. However, it's not supported both GUP_GET and GUP_PIN are set. This check should be done earlier, but not doing it till entering into follow_page_pte() and failed. Here move the checking to the beginning of __get_user_pages(). Signed-off-by: Baoquan He --- mm/gup.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/mm/gup.c b/mm/gup.c index 73777b1de679..8788105daee8 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -847,11 +847,6 @@ static struct page *follow_page_pte(struct vm_area_str= uct *vma, pte_t *ptep, pte; int ret; =20 - /* FOLL_GET and FOLL_PIN are mutually exclusive. */ - if (WARN_ON_ONCE((flags & (FOLL_PIN | FOLL_GET)) =3D=3D - (FOLL_PIN | FOLL_GET))) - return ERR_PTR(-EINVAL); - ptep =3D pte_offset_map_lock(mm, pmd, address, &ptl); if (!ptep) return no_page_table(vma, flags, address); @@ -1434,6 +1429,11 @@ static long __get_user_pages(struct mm_struct *mm, =20 VM_BUG_ON(!!pages !=3D !!(gup_flags & (FOLL_GET | FOLL_PIN))); =20 + /* FOLL_GET and FOLL_PIN are mutually exclusive. */ + if (WARN_ON_ONCE((flags & (FOLL_PIN | FOLL_GET)) =3D=3D + (FOLL_PIN | FOLL_GET))) + return ERR_PTR(-EINVAL); + do { struct page *page; unsigned int page_increm; --=20 2.41.0