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--- lk_usermodehelper [2019/02/14 15:05] – [kernel/umh.c] rpjday
+++ lk_usermodehelper [2019/02/14 15:18] (current) – [init/do_mounts_initrd.c] rpjday
@@ Line 267: / Line 267: @@
 out:
         return -ENOMEM;
+}
+</code>
+==== drivers/video/fbdev/uvesafb.c ====
+<code>
+static char v86d_path[PATH_MAX] = "/sbin/v86d";
+...
+static int uvesafb_helper_start(void)
+{
+        char *envp[] = {
+                "HOME=/",
+                "PATH=/sbin:/bin",
+                NULL,
+        };
+        char *argv[] = {
+                v86d_path,
+                NULL,
+        };
+        return call_usermodehelper(v86d_path, argv, envp, UMH_WAIT_PROC);
+}
+</code>
+==== drivers/macintosh/windfarm_core.c ====
+<code>
+static int wf_critical_overtemp(void)
+{
+        static char const critical_overtemp_path[] = "/sbin/critical_overtemp";
+        char *argv[] = { (char *)critical_overtemp_path, NULL };
+        static char *envp[] = { "HOME=/",
+                                "TERM=linux",
+                                "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
+                                NULL };
+        return call_usermodehelper(critical_overtemp_path,
+                                   argv, envp, UMH_WAIT_EXEC);
+}
+</code>
+==== init/do_mounts_initrd.c ====
+<code>
+static void __init handle_initrd(void)
+{
+        struct subprocess_info *info;
+        static char *argv[] = { "linuxrc", NULL, };
+        extern char *envp_init[];
+        int error;
+        real_root_dev = new_encode_dev(ROOT_DEV);
+        create_dev("/dev/root.old", Root_RAM0);
+        /* mount initrd on rootfs' /root */
+        mount_block_root("/dev/root.old", root_mountflags & ~MS_RDONLY);
+        ksys_mkdir("/old", 0700);
+        ksys_chdir("/old");
+        /*
+         * In case that a resume from disk is carried out by linuxrc or one of
+         * its children, we need to tell the freezer not to wait for us.
+         */
+        current->flags |= PF_FREEZER_SKIP;
+        info = call_usermodehelper_setup("/linuxrc", argv, envp_init,
+                                         GFP_KERNEL, init_linuxrc, NULL, NULL);
+        if (!info)
+                return;
+        call_usermodehelper_exec(info, UMH_WAIT_PROC);
+        ...
+</code>
+==== kernel/reboot.c ====
+<code>
+char poweroff_cmd[POWEROFF_CMD_PATH_LEN] = "/sbin/poweroff";
+static const char reboot_cmd[] = "/sbin/reboot";
+static int run_cmd(const char *cmd)
+{
+        char **argv;
+        static char *envp[] = {
+                "HOME=/",
+                "PATH=/sbin:/bin:/usr/sbin:/usr/bin",
+                NULL
+        };
+        int ret;
+        argv = argv_split(GFP_KERNEL, cmd, NULL);
+        if (argv) {
+                ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_EXEC);
+                argv_free(argv);
+        } else {
+                ret = -ENOMEM;
+        }
+        return ret;
 }
 </code>