From owner-dev-commits-src-branches@freebsd.org Sun Mar 28 00:25:27 2021 Return-Path: Delivered-To: dev-commits-src-branches@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 879B35ADE42; Sun, 28 Mar 2021 00:25:27 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4F7Gh72Jq8z4tY3; Sun, 28 Mar 2021 00:25:27 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org (gitrepo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:5]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 2D13F161FF; Sun, 28 Mar 2021 00:25:27 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org ([127.0.1.44]) by gitrepo.freebsd.org (8.16.1/8.16.1) with ESMTP id 12S0PRkW093421; Sun, 28 Mar 2021 00:25:27 GMT (envelope-from git@gitrepo.freebsd.org) Received: (from git@localhost) by gitrepo.freebsd.org (8.16.1/8.16.1/Submit) id 12S0PREl093420; Sun, 28 Mar 2021 00:25:27 GMT (envelope-from git) Date: Sun, 28 Mar 2021 00:25:27 GMT Message-Id: <202103280025.12S0PREl093420@gitrepo.freebsd.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org From: Mark Johnston Subject: git: c7d10e7ec872 - stable/13 - accept_filter: Fix filter parameter handling MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: markj X-Git-Repository: src X-Git-Refname: refs/heads/stable/13 X-Git-Reftype: branch X-Git-Commit: c7d10e7ec872070a40bbddc3158b1997c1df09af Auto-Submitted: auto-generated X-BeenThere: dev-commits-src-branches@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Commits to the stable branches of the FreeBSD src repository List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 28 Mar 2021 00:25:27 -0000 The branch stable/13 has been updated by markj: URL: https://cgit.FreeBSD.org/src/commit/?id=c7d10e7ec872070a40bbddc3158b1997c1df09af commit c7d10e7ec872070a40bbddc3158b1997c1df09af Author: Mark Johnston AuthorDate: 2021-03-25 21:55:20 +0000 Commit: Mark Johnston CommitDate: 2021-03-28 00:24:15 +0000 accept_filter: Fix filter parameter handling For filters which implement accf_create, the setsockopt(2) handler caches the filter name in the socket, but it also incorrectly frees the buffer containing the copy, leaving a dangling pointer. Note that no accept filters provided in the base system are susceptible to this, as they don't implement accf_create. Reported by: Alexey Kulaev Discussed with: emaste Security: kernel use-after-free MFC after: 3 days Sponsored by: The FreeBSD Foundation (cherry picked from commit 653a437c04440495cd8e7712c7cf39444f26f1ee) --- sys/kern/uipc_accf.c | 1 + 1 file changed, 1 insertion(+) diff --git a/sys/kern/uipc_accf.c b/sys/kern/uipc_accf.c index debf4b2deeb1..3ca64dd21e25 100644 --- a/sys/kern/uipc_accf.c +++ b/sys/kern/uipc_accf.c @@ -299,6 +299,7 @@ accept_filt_setopt(struct socket *so, struct sockopt *sopt) so->sol_accept_filter = afp; so->sol_accept_filter_arg = accept_filter_arg; so->sol_accept_filter_str = accept_filter_str; + accept_filter_str = NULL; so->so_options |= SO_ACCEPTFILTER; out: SOCK_UNLOCK(so);