From patchwork Tue May 7 19:55:09 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Audra Mitchell X-Patchwork-Id: 13657694 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (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 2E44116E869 for ; Tue, 7 May 2024 19:55:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715111722; cv=none; b=tzdnEN1pjxNsNQen1VwSFjG/O6f8TeOPAzLgA7RLT/breOR4YBVZ7VAs6lbR8uBiqx7cvKx16QW8CkndkSUawEElMzc6GPLmcBMTDRjNhUHcGJbTDts/hIbo1pByFu0aaR7LjMOGg7EhCdLzP/XixRpgjgASoHExyJvTsKg5UKM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715111722; c=relaxed/simple; bh=a0wY0qoFOsxghYv4yN8+yu9MTxt8hu8AS20FIolS/uU=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=SOsI7ebJTxI4if3fPCXPaP9DIv/lmrojJvQwRxYolf4AYMI8IcBAMBwh+uzDOnj9ZCToCZUGnH3IPLdamsxWAjeRk9EZEqkz0gMfTk+DID0RcZcREsjtcVWQjNnHjeChyet/f1g/XRHkpAQS+Vqw/u5NUXihVIduDzKfqGzbiLY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none 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=CgeUslUg; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none 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="CgeUslUg" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1715111719; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=qlhwsbkKKVd2ohQ0kuBs8V/ScuJpgv65EhyU0mX2mEQ=; b=CgeUslUgf9ItBqGZOF46n0bgbqSpIiUg+n9kQmG5AqFfC+swUomEeT1vbjwfklS0owqhMj fxvBUAopnE8SjCXIsZDsr0M/pxtvdKWBH6tMYz2kFOLHMb5ijpUR7qirseJS7wHb4KiKTr 6X5HffJRxUSQSIXOj+86aIWTjFBmocY= Received: from mimecast-mx02.redhat.com (mx-ext.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-567-BSvfzLQPO9mBz_2vPSWUpg-1; Tue, 07 May 2024 15:55:16 -0400 X-MC-Unique: BSvfzLQPO9mBz_2vPSWUpg-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.rdu2.redhat.com [10.11.54.4]) (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 mimecast-mx02.redhat.com (Postfix) with ESMTPS id 6BBCD1C031BB; Tue, 7 May 2024 19:55:15 +0000 (UTC) Received: from fedora.redhat.com (unknown [10.22.18.45]) by smtp.corp.redhat.com (Postfix) with ESMTP id 21C3820B96E0; Tue, 7 May 2024 19:55:15 +0000 (UTC) From: Audra Mitchell To: viro@zeniv.linux.org.uk Cc: brauner@kernel.org, jack@suse.cz, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, akpm@linux-foundation.org, shuah@kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org, raquini@redhat.com Subject: [PATCH 1/2] Fix userfaultfd_api to return EINVAL as expected Date: Tue, 7 May 2024 15:55:09 -0400 Message-ID: <20240507195510.283744-1-audra@redhat.com> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.4 Currently if we request a feature that is not set in the Kernel config we fail silently and return the available features. However, the documentation indicates we should return an EINVAL. We need to fix this issue since we can end up with a Kernel warning should a program request the feature UFFD_FEATURE_WP_UNPOPULATED on a kernel with the config not set with this feature. Signed-off-by: Audra Mitchell --- fs/userfaultfd.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c index 60dcfafdc11a..17210558de79 100644 --- a/fs/userfaultfd.c +++ b/fs/userfaultfd.c @@ -2073,6 +2073,11 @@ static int userfaultfd_api(struct userfaultfd_ctx *ctx, uffdio_api.features &= ~UFFD_FEATURE_WP_UNPOPULATED; uffdio_api.features &= ~UFFD_FEATURE_WP_ASYNC; #endif + + ret = -EINVAL; + if (features & ~uffdio_api.features) + goto err_out; + uffdio_api.ioctls = UFFD_API_IOCTLS; ret = -EFAULT; if (copy_to_user(buf, &uffdio_api, sizeof(uffdio_api)))