main: fix the case where user has "halt" as login shell. Closes 9986

halt::0:0::/:/sbin/halt

function                                             old     new   delta
run_applet_and_exit                                  748     751      +3
run_applet_no_and_exit                               467     459      -8

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

5 files changed, 11 insertions, 7 deletions

diff --git a/include/libbb.h b/include/libbb.h
index 1c9de3af0..0317c7d6a 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -1117,7 +1117,7 @@ int spawn_and_wait(char **argv) FAST_FUNC;
 int run_nofork_applet(int applet_no, char **argv) FAST_FUNC;
 #ifndef BUILD_INDIVIDUAL
 extern int find_applet_by_name(const char *name) FAST_FUNC;
-extern void run_applet_no_and_exit(int a, char **argv) NORETURN FAST_FUNC;
+extern void run_applet_no_and_exit(int a, const char *name, char **argv) NORETURN FAST_FUNC;
 #endif
 
 /* Helpers for daemonization.
diff --git a/libbb/appletlib.c b/libbb/appletlib.c
index 2dea2b43a..df6584978 100644
--- a/libbb/appletlib.c
+++ b/libbb/appletlib.c
@@ -877,13 +877,17 @@ static int busybox_main(char **argv)
 # endif
 
 # if NUM_APPLETS > 0
-void FAST_FUNC run_applet_no_and_exit(int applet_no, char **argv)
+void FAST_FUNC run_applet_no_and_exit(int applet_no, const char *name, char **argv)
 {
         int argc = string_array_len(argv);
 
         /* Reinit some shared global data */
         xfunc_error_retval = EXIT_FAILURE;
-        applet_name = bb_get_last_path_component_nostrip(argv[0]);
+        /*
+         * We do not use argv[0]: do not want to repeat massaging of
+         * "-/sbin/halt" -> "halt", for example.
+         */
+        applet_name = name;
 
         /* Special case. POSIX says "test --help"
          * should be no different from e.g. "test --foo".
@@ -927,7 +931,7 @@ static NORETURN void run_applet_and_exit(const char *name, char **argv)
         {
                 int applet = find_applet_by_name(name);
                 if (applet >= 0)
-                        run_applet_no_and_exit(applet, argv);
+                        run_applet_no_and_exit(applet, name, argv);
         }
 #  endif
 
diff --git a/libbb/vfork_daemon_rexec.c b/libbb/vfork_daemon_rexec.c
index 2695f99ee..576534ee5 100644
--- a/libbb/vfork_daemon_rexec.c
+++ b/libbb/vfork_daemon_rexec.c
@@ -180,7 +180,7 @@ int FAST_FUNC spawn_and_wait(char **argv)
                          * as of yet (and that should probably always stay true).
                          */
                         /* xfunc_error_retval and applet_name are init by: */
-                        run_applet_no_and_exit(a, argv);
+                        run_applet_no_and_exit(a, argv[0], argv);
                 }
 # endif
         }
diff --git a/shell/ash.c b/shell/ash.c
index b7635a823..8c2098dd9 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -7717,7 +7717,7 @@ tryexec(IF_FEATURE_SH_STANDALONE(int applet_no,) char *cmd, char **argv, char **
                         clearenv();
                         while (*envp)
                                 putenv(*envp++);
-                        run_applet_no_and_exit(applet_no, argv);
+                        run_applet_no_and_exit(applet_no, cmd, argv);
                 }
                 /* re-exec ourselves with the new arguments */
                 execve(bb_busybox_exec_path, argv, envp);
diff --git a/shell/hush.c b/shell/hush.c
index 4ba6b3fdd..cf6d8cd9f 100644
--- a/shell/hush.c
+++ b/shell/hush.c
@@ -7063,7 +7063,7 @@ static NOINLINE void pseudo_exec_argv(nommu_save_t *nommu_save,
                                 /* Do not leak open fds from opened script files etc */
                                 close_all_FILE_list();
                                 debug_printf_exec("running applet '%s'\n", argv[0]);
-                                run_applet_no_and_exit(a, argv);
+                                run_applet_no_and_exit(a, argv[0], argv);
                         }
 # endif
                         /* Re-exec ourselves */