From owner-svn-src-all@FreeBSD.ORG Mon Nov 24 09:31:39 2014 Return-Path: Delivered-To: svn-src-all@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 1F2ED329; Mon, 24 Nov 2014 09:31:39 +0000 (UTC) Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:1900:2254:2068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id E682885A; Mon, 24 Nov 2014 09:31:38 +0000 (UTC) Received: from svn.freebsd.org ([127.0.1.70]) by svn.freebsd.org (8.14.9/8.14.9) with ESMTP id sAO9Vcwb039949; Mon, 24 Nov 2014 09:31:38 GMT (envelope-from brueffer@FreeBSD.org) Received: (from brueffer@localhost) by svn.freebsd.org (8.14.9/8.14.9/Submit) id sAO9VcRS039948; Mon, 24 Nov 2014 09:31:38 GMT (envelope-from brueffer@FreeBSD.org) Message-Id: <201411240931.sAO9VcRS039948@svn.freebsd.org> X-Authentication-Warning: svn.freebsd.org: brueffer set sender to brueffer@FreeBSD.org using -f From: Christian Brueffer Date: Mon, 24 Nov 2014 09:31:38 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r274960 - head/usr.bin/elfdump X-SVN-Group: head MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 24 Nov 2014 09:31:39 -0000 Author: brueffer Date: Mon Nov 24 09:31:38 2014 New Revision: 274960 URL: https://svnweb.freebsd.org/changeset/base/274960 Log: Limit descriptors and enter capability mode. Differential: D1009 Reviewed by: jonathan, pjd MFC after: 2 weeks Relnotes: yes Modified: head/usr.bin/elfdump/elfdump.c Modified: head/usr.bin/elfdump/elfdump.c ============================================================================== --- head/usr.bin/elfdump/elfdump.c Mon Nov 24 09:16:19 2014 (r274959) +++ head/usr.bin/elfdump/elfdump.c Mon Nov 24 09:31:38 2014 (r274960) @@ -29,12 +29,15 @@ __FBSDID("$FreeBSD$"); #include + +#include #include #include #include #include #include #include +#include #include #include #include @@ -467,6 +470,7 @@ elf_get_shstrndx(Elf32_Ehdr *e, void *sh int main(int ac, char **av) { + cap_rights_t rights; u_int64_t phoff; u_int64_t shoff; u_int64_t phentsize; @@ -527,6 +531,9 @@ main(int ac, char **av) case 'w': if ((out = fopen(optarg, "w")) == NULL) err(1, "%s", optarg); + cap_rights_init(&rights, CAP_FSTAT, CAP_WRITE); + if (cap_rights_limit(fileno(out), &rights) < 0 && errno != ENOSYS) + err(1, "unable to limit rights for %s", optarg); break; case '?': default: @@ -539,6 +546,17 @@ main(int ac, char **av) if ((fd = open(*av, O_RDONLY)) < 0 || fstat(fd, &sb) < 0) err(1, "%s", *av); + cap_rights_init(&rights, CAP_MMAP_R); + if (cap_rights_limit(fd, &rights) < 0 && errno != ENOSYS) + err(1, "unable to limit rights for %s", *av); + close(STDIN_FILENO); + cap_rights_init(&rights, CAP_WRITE); + if (cap_rights_limit(STDOUT_FILENO, &rights) < 0 && errno != ENOSYS) + err(1, "unable to limit rights for stdout"); + if (cap_rights_limit(STDERR_FILENO, &rights) < 0 && errno != ENOSYS) + err(1, "unable to limit rights for stderr"); + if (cap_enter() < 0 && errno != ENOSYS) + err(1, "unable to enter capability mode"); e = mmap(NULL, sb.st_size, PROT_READ, MAP_SHARED, fd, 0); if (e == MAP_FAILED) err(1, NULL);