From owner-svn-src-all@freebsd.org Wed Dec 11 15:52:30 2019 Return-Path: Delivered-To: svn-src-all@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 555861D9781; Wed, 11 Dec 2019 15:52:30 +0000 (UTC) (envelope-from avg@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) server-signature RSA-PSS (4096 bits) client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 47Y1f61W0wz4GQ5; Wed, 11 Dec 2019 15:52:30 +0000 (UTC) (envelope-from avg@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 2F226D9CF; Wed, 11 Dec 2019 15:52:30 +0000 (UTC) (envelope-from avg@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id xBBFqUVB009117; Wed, 11 Dec 2019 15:52:30 GMT (envelope-from avg@FreeBSD.org) Received: (from avg@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id xBBFqUq9009116; Wed, 11 Dec 2019 15:52:30 GMT (envelope-from avg@FreeBSD.org) Message-Id: <201912111552.xBBFqUq9009116@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: avg set sender to avg@FreeBSD.org using -f From: Andriy Gapon Date: Wed, 11 Dec 2019 15:52:30 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r355611 - head/sys/kern X-SVN-Group: head X-SVN-Commit-Author: avg X-SVN-Commit-Paths: head/sys/kern X-SVN-Commit-Revision: 355611 X-SVN-Commit-Repository: base 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: 2.1.29 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: Wed, 11 Dec 2019 15:52:30 -0000 Author: avg Date: Wed Dec 11 15:52:29 2019 New Revision: 355611 URL: https://svnweb.freebsd.org/changeset/base/355611 Log: add a sanity check to the system call registration code A system call number should be at least reserved. We do not expect an attempt to register a fixed number system call when nothing at all is known about it. MFC after: 3 weeks Sponsored by: Panzura Modified: head/sys/kern/kern_syscalls.c Modified: head/sys/kern/kern_syscalls.c ============================================================================== --- head/sys/kern/kern_syscalls.c Wed Dec 11 15:15:21 2019 (r355610) +++ head/sys/kern/kern_syscalls.c Wed Dec 11 15:52:29 2019 (r355611) @@ -120,11 +120,14 @@ kern_syscall_register(struct sysent *sysents, int *off if (i == SYS_MAXSYSCALL) return (ENFILE); *offset = i; - } else if (*offset < 0 || *offset >= SYS_MAXSYSCALL) + } else if (*offset < 0 || *offset >= SYS_MAXSYSCALL) { return (EINVAL); - else if (sysents[*offset].sy_call != (sy_call_t *)lkmnosys && - sysents[*offset].sy_call != (sy_call_t *)lkmressys) + } else if (sysents[*offset].sy_call != (sy_call_t *)lkmnosys && + sysents[*offset].sy_call != (sy_call_t *)lkmressys) { + KASSERT(sysents[*offset].sy_call != NULL, + ("undefined syscall %d", *offset)); return (EEXIST); + } KASSERT(sysents[*offset].sy_thrcnt == SY_THR_ABSENT, ("dynamic syscall is not protected"));