diff options
| -rw-r--r-- | Config.in | 10 | ||||
| -rw-r--r-- | init/init.c | 29 | ||||
| -rw-r--r-- | libbb/xfuncs.c | 7 | ||||
| -rw-r--r-- | scripts/defconfig | 1 | ||||
| -rw-r--r-- | shell/ash.c | 4 |
5 files changed, 39 insertions, 12 deletions
@@ -231,6 +231,14 @@ config SELINUX Most people will leave this set to 'N'. +config FEATURE_EXEC_PREFER_APPLETS + bool "exec prefers applets" + default n + help + This is an experimental option which directs applets about to + call 'exec' to try and find an applicable busybox applet before + searching the executable path for a binary or symlink to execute. + config BUSYBOX_EXEC_PATH string "Path to BusyBox executable" default "/proc/self/exe" @@ -439,7 +447,7 @@ config INSTALL_APPLET_HARDLINKS config INSTALL_APPLET_DONT bool prompt "not installed" - depends on FEATURE_INSTALLER || FEATURE_SH_STANDALONE_SHELL + depends on FEATURE_INSTALLER || FEATURE_SH_STANDALONE_SHELL || FEATURE_EXEC_PREFER_APPLETS help Do not install applet links. Useful when using the -install feature or a standalone shell for rescue pruposes. diff --git a/init/init.c b/init/init.c index 6fc68af..7694b44 100644 --- a/init/init.c +++ b/init/init.c @@ -389,6 +389,7 @@ static pid_t run(const struct init_action *a) #include CUSTOMIZED_BANNER #endif "\nPlease press Enter to activate this console. "; + char *prog; /* Block sigchild while forking. */ sigemptyset(&nmask); @@ -560,7 +561,10 @@ static pid_t run(const struct init_action *a) /* Now run it. The new program will take over this PID, * so nothing further in init.c should be run. */ - execv(cmdpath, cmd); + prog = cmdpath; + if (ENABLE_FEATURE_EXEC_PREFER_APPLETS && find_applet_by_name(prog)) + prog = CONFIG_BUSYBOX_EXEC_PATH; + execvp(prog, cmd); /* We're still here? Some error happened. */ message(LOG | CONSOLE, "Bummer, cannot run '%s': %m", cmdpath); @@ -678,6 +682,7 @@ static void exec_signal(int sig ATTRIBUTE_UNUSED) { struct init_action *a, *tmp; sigset_t unblock_signals; + char *prog; for (a = init_action_list; a; a = tmp) { tmp = a->next; @@ -713,7 +718,10 @@ static void exec_signal(int sig ATTRIBUTE_UNUSED) dup(0); messageD(CONSOLE | LOG, "Trying to re-exec %s", a->command); - execl(a->command, a->command, NULL); + prog = a->command; + if (ENABLE_FEATURE_EXEC_PREFER_APPLETS && find_applet_by_name(prog)) + prog = CONFIG_BUSYBOX_EXEC_PATH; + execlp(prog, a->command, NULL); message(CONSOLE | LOG, "exec of '%s' failed: %m", a->command); @@ -852,13 +860,13 @@ static void parse_inittab(void) /* No inittab file -- set up some default behavior */ #endif /* Reboot on Ctrl-Alt-Del */ - new_init_action(CTRLALTDEL, "/sbin/reboot", ""); + new_init_action(CTRLALTDEL, "reboot", ""); /* Umount all filesystems on halt/reboot */ - new_init_action(SHUTDOWN, "/bin/umount -a -r", ""); + new_init_action(SHUTDOWN, "umount -a -r", ""); /* Swapoff on halt/reboot */ - if(ENABLE_SWAPONOFF) new_init_action(SHUTDOWN, "/sbin/swapoff -a", ""); + if(ENABLE_SWAPONOFF) new_init_action(SHUTDOWN, "swapoff -a", ""); /* Prepare to restart init when a HUP is received */ - new_init_action(RESTART, "/sbin/init", ""); + new_init_action(RESTART, "init", ""); /* Askfirst shell on tty1-4 */ new_init_action(ASKFIRST, bb_default_login_shell, ""); new_init_action(ASKFIRST, bb_default_login_shell, VC_2); @@ -1039,9 +1047,9 @@ int init_main(int argc, char **argv) { message(CONSOLE,"Low memory: forcing swapon."); /* swapon -a requires /proc typically */ - new_init_action(SYSINIT, "/bin/mount -t proc proc /proc", ""); + new_init_action(SYSINIT, "mount -t proc proc /proc", ""); /* Try to turn on swap */ - new_init_action(SYSINIT, "/sbin/swapon -a", ""); + new_init_action(SYSINIT, "swapon -a", ""); run_actions(SYSINIT); /* wait and removing */ } } @@ -1068,7 +1076,10 @@ int init_main(int argc, char **argv) putenv("SELINUX_INIT=YES"); if (selinux_init_load_policy(&enforce) == 0) { - execv(argv[0], argv); + char *prog = argv[0]; + if (ENABLE_FEATURE_EXEC_PREFER_APPLETS && find_applet_by_name(prog)) + prog = CONFIG_BUSYBOX_EXEC_PATH; + execvp(prog, argv); } else if (enforce > 0) { /* SELinux in enforcing mode but load_policy failed */ /* At this point, we probably can't open /dev/console, so log() won't work */ diff --git a/libbb/xfuncs.c b/libbb/xfuncs.c index 240ac5d..4252e76 100644 --- a/libbb/xfuncs.c +++ b/libbb/xfuncs.c @@ -183,14 +183,17 @@ pid_t spawn(char **argv) /* Why static? */ static int failed; pid_t pid; - void *app = ENABLE_FEATURE_SH_STANDALONE_SHELL ? find_applet_by_name(argv[0]) : 0; + char *prog; // Be nice to nommu machines. failed = 0; pid = vfork(); if (pid < 0) return pid; if (!pid) { - execvp(app ? CONFIG_BUSYBOX_EXEC_PATH : *argv, argv); + prog = argv[0]; + if (ENABLE_FEATURE_EXEC_PREFER_APPLETS && find_applet_by_name(prog)) + prog = CONFIG_BUSYBOX_EXEC_PATH; + execvp(prog, argv); // We're sharing a stack with blocked parent, let parent know we failed // and then exit to unblock parent (but don't run atexit() stuff, which diff --git a/scripts/defconfig b/scripts/defconfig index 2c82ed4..fc43deb 100644 --- a/scripts/defconfig +++ b/scripts/defconfig @@ -27,6 +27,7 @@ CONFIG_FEATURE_SYSLOG=y CONFIG_FEATURE_SUID_CONFIG=y CONFIG_FEATURE_SUID_CONFIG_QUIET=y # CONFIG_SELINUX is not set +#CONFIG_FEATURE_EXEC_PREFER_APPLETS is not set CONFIG_BUSYBOX_EXEC_PATH="/proc/self/exe" # diff --git a/shell/ash.c b/shell/ash.c index 8ef8c46..2db3302 100644 --- a/shell/ash.c +++ b/shell/ash.c @@ -6528,6 +6528,10 @@ setjobctl(int on) int ofd; ofd = fd = open(_PATH_TTY, O_RDWR); if (fd < 0) { + /* BTW, bash will try to open(ttyname(0)) if open("/dev/tty") fails. + * That sometimes helps to acquire controlling tty. + * Obviously, a workaround for bugs when someone + * failed to provide a controlling tty to bash! :) */ fd += 3; while (!isatty(fd) && --fd >= 0) ; |