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Mon, 25 Jul 2022 15:00:30 GMT (envelope-from git) Date: Mon, 25 Jul 2022 15:00:30 GMT Message-Id: <202207251500.26PF0Uht011319@gitrepo.freebsd.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org From: Ed Maste Subject: git: 5f7ae464db5b - stable/12 - blacklistd: Handle 0 sized messages List-Id: Commits to the stable branches of the FreeBSD src repository List-Archive: https://lists.freebsd.org/archives/dev-commits-src-branches List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-dev-commits-src-branches@freebsd.org X-BeenThere: dev-commits-src-branches@freebsd.org MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: emaste X-Git-Repository: src X-Git-Refname: refs/heads/stable/12 X-Git-Reftype: branch X-Git-Commit: 5f7ae464db5bd1527a844c228afc269cedb6822c Auto-Submitted: auto-generated ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; 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mx1.freebsd.org; none X-ThisMailContainsUnwantedMimeParts: N The branch stable/12 has been updated by emaste: URL: https://cgit.FreeBSD.org/src/commit/?id=5f7ae464db5bd1527a844c228afc269cedb6822c commit 5f7ae464db5bd1527a844c228afc269cedb6822c Author: Ed Maste AuthorDate: 2022-07-18 00:43:52 +0000 Commit: Ed Maste CommitDate: 2022-07-25 15:00:11 +0000 blacklistd: Handle 0 sized messages Patch obtained from https://github.com/zoulasc/blocklist commit ada75856bc6fcabbdd25ffbe08fbad5cf2a2c08a PR: 264599 MFC after: 1 week (cherry picked from commit b1e81e6ddee42efb0f0d49cfc6cebb48d52e3f08) --- contrib/blacklist/lib/bl.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/contrib/blacklist/lib/bl.c b/contrib/blacklist/lib/bl.c index 9f93b91f4c8f..ab2bd7c43ebe 100644 --- a/contrib/blacklist/lib/bl.c +++ b/contrib/blacklist/lib/bl.c @@ -434,6 +434,7 @@ bl_recv(bl_t b) } ub; int got; ssize_t rlen; + size_t rem; bl_info_t *bi = &b->b_info; got = 0; @@ -504,10 +505,12 @@ bl_recv(bl_t b) return NULL; } - if ((size_t)rlen <= sizeof(ub.bl)) { + rem = (size_t)rlen; + if (rem < sizeof(ub.bl)) { bl_log(b->b_fun, LOG_ERR, "message too short %zd", rlen); return NULL; } + rem -= sizeof(ub.bl); if (ub.bl.bl_version != BL_VERSION) { bl_log(b->b_fun, LOG_ERR, "bad version %d", ub.bl.bl_version); @@ -521,7 +524,10 @@ bl_recv(bl_t b) bi->bi_uid = -1; bi->bi_gid = -1; #endif - strlcpy(bi->bi_msg, ub.bl.bl_data, MIN(sizeof(bi->bi_msg), - ((size_t)rlen - sizeof(ub.bl) + 1))); + rem = MIN(sizeof(bi->bi_msg), rem); + if (rem == 0) + bi->bi_msg[0] = '\0'; + else + strlcpy(bi->bi_msg, ub.bl.bl_data, rem); return bi; }