From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sasha Levin Subject: [PATCH AUTOSEL 4.18 10/59] bpf: fix bpf_prog_get_info_by_fd to return 0 func_lens for unpriv Date: Wed, 14 Nov 2018 17:22:42 -0500 Message-ID: <20181114222335.99339-10-sashal@kernel.org> References: <20181114222335.99339-1-sashal@kernel.org> Cc: Daniel Borkmann , Sandipan Das , Song Liu , Alexei Starovoitov , Sasha Levin , netdev@vger.kernel.org To: stable@vger.kernel.org, linux-kernel@vger.kernel.org Return-path: Received: from mail.kernel.org ([198.145.29.99]:36000 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726457AbeKOI3M (ORCPT ); Thu, 15 Nov 2018 03:29:12 -0500 In-Reply-To: <20181114222335.99339-1-sashal@kernel.org> Sender: netdev-owner@vger.kernel.org List-ID: From: Daniel Borkmann [ Upstream commit 28c2fae726bf5003cd209b0d5910a642af98316f ] While dbecd7388476 ("bpf: get kernel symbol addresses via syscall") zeroed info.nr_jited_ksyms in bpf_prog_get_info_by_fd() for queries from unprivileged users, commit 815581c11cc2 ("bpf: get JITed image lengths of functions via syscall") forgot about doing so and therefore returns the #elems of the user set up buffer which is incorrect. It also needs to indicate a info.nr_jited_func_lens of zero. Fixes: 815581c11cc2 ("bpf: get JITed image lengths of functions via syscall") Signed-off-by: Daniel Borkmann Cc: Sandipan Das Cc: Song Liu Signed-off-by: Alexei Starovoitov Signed-off-by: Sasha Levin --- kernel/bpf/syscall.c | 1 + 1 file changed, 1 insertion(+) diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index a31a1ba0f8ea..482215292b0f 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -1896,6 +1896,7 @@ static int bpf_prog_get_info_by_fd(struct bpf_prog *prog, info.jited_prog_len = 0; info.xlated_prog_len = 0; info.nr_jited_ksyms = 0; + info.nr_jited_func_lens = 0; goto done; } -- 2.17.1