From owner-svn-src-head@freebsd.org Fri Oct 26 20:55:02 2018 Return-Path: Delivered-To: svn-src-head@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id A19B910884E7; Fri, 26 Oct 2018 20:55:02 +0000 (UTC) (envelope-from cem@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 5688A8742B; Fri, 26 Oct 2018 20:55:02 +0000 (UTC) (envelope-from cem@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 33B3C261FC; Fri, 26 Oct 2018 20:55:02 +0000 (UTC) (envelope-from cem@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id w9QKt1or086235; Fri, 26 Oct 2018 20:55:01 GMT (envelope-from cem@FreeBSD.org) Received: (from cem@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id w9QKt1mg086234; Fri, 26 Oct 2018 20:55:01 GMT (envelope-from cem@FreeBSD.org) Message-Id: <201810262055.w9QKt1mg086234@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: cem set sender to cem@FreeBSD.org using -f From: Conrad Meyer Date: Fri, 26 Oct 2018 20:55:01 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r339788 - head/sys/dev/random X-SVN-Group: head X-SVN-Commit-Author: cem X-SVN-Commit-Paths: head/sys/dev/random X-SVN-Commit-Revision: 339788 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Oct 2018 20:55:02 -0000 Author: cem Date: Fri Oct 26 20:55:01 2018 New Revision: 339788 URL: https://svnweb.freebsd.org/changeset/base/339788 Log: Fortuna: fix a correctness issue in reseed (fortuna_pre_read) 'i' counts the number of pools included in the array 's'. Passing 'i+1' to reseed_internal() as the number of blocks in 's' is a bogus overrun of the initialized portion of 's' -- technically UB. I found this via code inspection, referencing ยง9.5.2 "Pools" of the Fortuna chapter, but I would expect Coverity to notice the same issue. Unfortunately, it doesn't appear to. Reviewed by: markm Approved by: secteam (gordon) Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D16985 Modified: head/sys/dev/random/fortuna.c Modified: head/sys/dev/random/fortuna.c ============================================================================== --- head/sys/dev/random/fortuna.c Fri Oct 26 20:53:01 2018 (r339787) +++ head/sys/dev/random/fortuna.c Fri Oct 26 20:55:01 2018 (r339788) @@ -408,7 +408,7 @@ random_fortuna_pre_read(void) SDT_PROBE2(random, fortuna, event_processor, debug, fortuna_state.fs_reseedcount, fortuna_state.fs_pool); #endif /* FS&K */ - random_fortuna_reseed_internal(s, i < RANDOM_FORTUNA_NPOOLS ? i + 1 : RANDOM_FORTUNA_NPOOLS); + random_fortuna_reseed_internal(s, i); /* Clean up and secure */ explicit_bzero(s, sizeof(s)); explicit_bzero(temp, sizeof(temp));