From patchwork Mon May 16 18:26:57 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eugene Syromiatnikov X-Patchwork-Id: 12851336 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id CEE53C433F5 for ; Mon, 16 May 2022 18:27:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344747AbiEPS1S (ORCPT ); Mon, 16 May 2022 14:27:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44116 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229692AbiEPS1S (ORCPT ); Mon, 16 May 2022 14:27:18 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id EDA6D3DA64 for ; Mon, 16 May 2022 11:27:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1652725636; 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; bh=id00oVYTmyhqPqdSLuA7jfzPXEfe8AjRZdJymH4RAy0=; b=XGKI4KMCU82ymnvnqyw2x4IfJLKH2WsmkGtdQQTmYiW8LpqhX2XO9pZ4DMIhzR1UB6bPOt SBRtauWabedmbHyBTjPtnU3c8sjfJdRcq3cyKxUqltK1y+D2JSzrhzHd6VqR+lnR/1LSjm bb+FWqbYO107w0a6zqspTDHVBm8if2A= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-29-hkLDBe64NLOiL3uXQ0xXTA-1; Mon, 16 May 2022 14:27:12 -0400 X-MC-Unique: hkLDBe64NLOiL3uXQ0xXTA-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.rdu2.redhat.com [10.11.54.7]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 6B4561DC245E; Mon, 16 May 2022 18:27:04 +0000 (UTC) Received: from asgard.redhat.com (unknown [10.36.110.3]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 02FC4155F652; Mon, 16 May 2022 18:26:59 +0000 (UTC) Date: Mon, 16 May 2022 20:26:57 +0200 From: Eugene Syromiatnikov To: Jiri Olsa , Masami Hiramatsu , Steven Rostedt , Ingo Molnar , Alexei Starovoitov , Daniel Borkmann Cc: Andrii Nakryiko , Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , netdev@vger.kernel.org, bpf@vger.kernel.org, linux-kernel@vger.kernel.org, Shuah Khan , linux-kselftest@vger.kernel.org Subject: [PATCH bpf 0/4] Fix 32-bit arch and compat support for the kprobe_multi attach type Message-ID: <20220516182657.GA28596@asgard.redhat.com> MIME-Version: 1.0 Content-Disposition: inline User-Agent: Mutt/1.5.23 (2014-03-12) X-Scanned-By: MIMEDefang 2.85 on 10.11.54.7 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org As suggested in [1], the kprobe_multi interface is to be fixed for 32-bit architectures and compat, rather then disabled. As it turned out, there are a couple of additional problems that are to be addressed: - the absence of size overflow checks, leading to possible out-of-bounds writes (addressed by the first patch); - the assumption that long has the same size as u64, which would make cookies arrays size calculation incorrect on 32-bit architectures (addressed by the second patch); - the addrs array passing API, that is incompatible with compat and has to be changed (addressed in the fourth patch): those are kernel addresses and not user ones (as was incorrectly stated in [2]); this change is only semantical for 64-bit user/kernelspace, so it shouldn't impact ABI there, at least. [1] https://lore.kernel.org/lkml/CAADnVQ+2gwhcMht4PuDnDOFKY68Wsq8QFz4Y69NBX_TLaSexQQ@mail.gmail.com/ [2] https://lore.kernel.org/lkml/20220510184155.GA8295@asgard.redhat.com/ Eugene Syromiatnikov (4): bpf_trace: check size for overflow in bpf_kprobe_multi_link_attach bpf_trace: support 32-bit kernels in bpf_kprobe_multi_link_attach bpf_trace: handle compat in kprobe_multi_resolve_syms bpf_trace: pass array of u64 values in kprobe_multi.addrs kernel/trace/bpf_trace.c | 63 ++++++++++++++++------ tools/lib/bpf/bpf.h | 2 +- tools/lib/bpf/libbpf.c | 8 +-- tools/lib/bpf/libbpf.h | 2 +- .../testing/selftests/bpf/prog_tests/bpf_cookie.c | 2 +- .../selftests/bpf/prog_tests/kprobe_multi_test.c | 2 +- 6 files changed, 54 insertions(+), 25 deletions(-)