Date: Sun, 23 Feb 2020 03:13:40 +0000 (UTC) From: Kyle Evans <kevans@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-12@freebsd.org Subject: svn commit: r358255 - in stable: 11/usr.sbin/cron/cron 11/usr.sbin/cron/lib 12/usr.sbin/cron/cron 12/usr.sbin/cron/lib Message-ID: <202002230313.01N3Dex8071796@repo.freebsd.org>
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Author: kevans Date: Sun Feb 23 03:13:38 2020 New Revision: 358255 URL: https://svnweb.freebsd.org/changeset/base/358255 Log: MFC r357714-r357715: cron(8): rip out some legacy bits r357714: cron(8): convert vfork() usage to fork() vfork() is error-prone, and the usage here definitely grew to not be clearly OK given vfork-semantics; e.g. setusercontext(3) within the child. Rip out vfork() and the rest of the references to it. fork is heavier, but it's unclear that the difference will be all that obvious. Reported by: Andrew Gierth and sigsys@gmail.com r357715: cron(8): rip out do_univ This was an old Dynix hack, the function is a NOP on FreeBSD. We have no need to retain this; Dynix was discontinued long ago. Modified: stable/12/usr.sbin/cron/cron/compat.h stable/12/usr.sbin/cron/cron/do_command.c stable/12/usr.sbin/cron/cron/externs.h stable/12/usr.sbin/cron/cron/popen.c stable/12/usr.sbin/cron/lib/compat.c Directory Properties: stable/12/ (props changed) Changes in other areas also in this revision: Modified: stable/11/usr.sbin/cron/cron/compat.h stable/11/usr.sbin/cron/cron/do_command.c stable/11/usr.sbin/cron/cron/externs.h stable/11/usr.sbin/cron/cron/popen.c stable/11/usr.sbin/cron/lib/compat.c Directory Properties: stable/11/ (props changed) Modified: stable/12/usr.sbin/cron/cron/compat.h ============================================================================== --- stable/12/usr.sbin/cron/cron/compat.h Sat Feb 22 23:36:10 2020 (r358254) +++ stable/12/usr.sbin/cron/cron/compat.h Sun Feb 23 03:13:38 2020 (r358255) @@ -76,10 +76,6 @@ /*****************************************************************/ -#if !defined(BSD) && !defined(HPUX) && !defined(CONVEX) && !defined(__linux) -# define NEED_VFORK -#endif - #if (!defined(BSD) || (BSD < 198902)) && !defined(__linux) && \ !defined(IRIX) && !defined(NeXT) && !defined(HPUX) # define NEED_STRCASECMP Modified: stable/12/usr.sbin/cron/cron/do_command.c ============================================================================== --- stable/12/usr.sbin/cron/cron/do_command.c Sat Feb 22 23:36:10 2020 (r358254) +++ stable/12/usr.sbin/cron/cron/do_command.c Sun Feb 23 03:13:38 2020 (r358255) @@ -38,8 +38,7 @@ static const char rcsid[] = #endif -static void child_process(entry *, user *), - do_univ(user *); +static void child_process(entry *, user *); static WAIT_T wait_on_child(PID_T, const char *); @@ -56,9 +55,6 @@ do_command(e, u) /* fork to become asynchronous -- parent process is done immediately, * and continues to run the normal cron code, which means return to * tick(). the child and grandchild don't leave this function, alive. - * - * vfork() is unsuitable, since we have much to do, and the parent - * needs to be able to run off and fork other processes. */ switch ((pid = fork())) { case -1: @@ -220,13 +216,13 @@ child_process(e, u) /* fork again, this time so we can exec the user's command. */ - switch (jobpid = vfork()) { + switch (jobpid = fork()) { case -1: - log_it("CRON",getpid(),"error","can't vfork"); + log_it("CRON",getpid(),"error","can't fork"); exit(ERROR_EXIT); /*NOTREACHED*/ case 0: - Debug(DPROC, ("[%d] grandchild process Vfork()'ed\n", + Debug(DPROC, ("[%d] grandchild process fork()'ed\n", getpid())) if (e->uid == ROOT_UID) @@ -279,12 +275,6 @@ child_process(e, u) close(stdin_pipe[READ_PIPE]); close(stdout_pipe[WRITE_PIPE]); - /* set our login universe. Do this in the grandchild - * so that the child can invoke /usr/lib/sendmail - * without surprises. - */ - do_univ(u); - # if defined(LOGIN_CAP) /* Set user's entire context, but skip the environment * as cron provides a separate interface for this @@ -311,24 +301,24 @@ child_process(e, u) if (setgid(e->gid) != 0) { log_it(usernm, getpid(), "error", "setgid failed"); - exit(ERROR_EXIT); + _exit(ERROR_EXIT); } # if defined(BSD) if (initgroups(usernm, e->gid) != 0) { log_it(usernm, getpid(), "error", "initgroups failed"); - exit(ERROR_EXIT); + _exit(ERROR_EXIT); } # endif if (setlogin(usernm) != 0) { log_it(usernm, getpid(), "error", "setlogin failed"); - exit(ERROR_EXIT); + _exit(ERROR_EXIT); } if (setuid(e->uid) != 0) { log_it(usernm, getpid(), "error", "setuid failed"); - exit(ERROR_EXIT); + _exit(ERROR_EXIT); } /* we aren't root after this..*/ #if defined(LOGIN_CAP) @@ -626,42 +616,4 @@ wait_on_child(PID_T childpid, const char *name) { Debug(DPROC, ("\n")) return waiter; -} - - -static void -do_univ(u) - user *u; -{ -#if defined(sequent) -/* Dynix (Sequent) hack to put the user associated with - * the passed user structure into the ATT universe if - * necessary. We have to dig the gecos info out of - * the user's password entry to see if the magic - * "universe(att)" string is present. - */ - - struct passwd *p; - char *s; - int i; - - p = getpwuid(u->uid); - (void) endpwent(); - - if (p == NULL) - return; - - s = p->pw_gecos; - - for (i = 0; i < 4; i++) - { - if ((s = strchr(s, ',')) == NULL) - return; - s++; - } - if (strcmp(s, "universe(att)")) - return; - - (void) universe(U_ATT); -#endif } Modified: stable/12/usr.sbin/cron/cron/externs.h ============================================================================== --- stable/12/usr.sbin/cron/cron/externs.h Sat Feb 22 23:36:10 2020 (r358254) +++ stable/12/usr.sbin/cron/cron/externs.h Sun Feb 23 03:13:38 2020 (r358255) @@ -141,7 +141,3 @@ extern int getdtablesize(void); #ifdef NEED_SETENV extern int setenv(char *, char *, int); #endif - -#ifdef NEED_VFORK -extern PID_T vfork(void); -#endif Modified: stable/12/usr.sbin/cron/cron/popen.c ============================================================================== --- stable/12/usr.sbin/cron/cron/popen.c Sat Feb 22 23:36:10 2020 (r358254) +++ stable/12/usr.sbin/cron/cron/popen.c Sun Feb 23 03:13:38 2020 (r358255) @@ -112,7 +112,7 @@ cron_popen(program, type, e, pidptr) #endif iop = NULL; - switch(pid = vfork()) { + switch(pid = fork()) { case -1: /* error */ (void)close(pdes[0]); (void)close(pdes[1]); Modified: stable/12/usr.sbin/cron/lib/compat.c ============================================================================== --- stable/12/usr.sbin/cron/lib/compat.c Sat Feb 22 23:36:10 2020 (r358254) +++ stable/12/usr.sbin/cron/lib/compat.c Sun Feb 23 03:13:38 2020 (r358255) @@ -35,18 +35,6 @@ static char rcsid[] = "$FreeBSD$"; #include <paths.h> -/* the code does not depend on any of vfork's - * side-effects; it just uses it as a quick - * fork-and-exec. - */ -#ifdef NEED_VFORK -PID_T -vfork() { - return (fork()); -} -#endif - - #ifdef NEED_STRDUP char * strdup(str)
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