diff options
Diffstat (limited to 'lib/kobject_uevent.c')
| -rw-r--r-- | lib/kobject_uevent.c | 37 |
1 files changed, 36 insertions, 1 deletions
diff --git a/lib/kobject_uevent.c b/lib/kobject_uevent.c index 03b427e2707e..78e16b95d210 100644 --- a/lib/kobject_uevent.c +++ b/lib/kobject_uevent.c @@ -433,8 +433,23 @@ static void zap_modalias_env(struct kobj_uevent_env *env) len = strlen(env->envp[i]) + 1; if (i != env->envp_idx - 1) { + /* @env->envp[] contains pointers to @env->buf[] + * with @env->buflen chars, and we are removing + * variable MODALIAS here pointed by @env->envp[i] + * with length @len as shown below: + * + * 0 @env->buf[] @env->buflen + * --------------------------------------------- + * ^ ^ ^ ^ + * | |-> @len <-| target block | + * @env->envp[0] @env->envp[i] @env->envp[i + 1] + * + * so the "target block" indicated above is moved + * backward by @len, and its right size is + * @env->buflen - (@env->envp[i + 1] - @env->envp[0]). + */ memmove(env->envp[i], env->envp[i + 1], - env->buflen - len); + env->buflen - (env->envp[i + 1] - env->envp[0])); for (j = i; j < env->envp_idx - 1; j++) env->envp[j] = env->envp[j + 1] - len; @@ -811,3 +826,23 @@ static int __init kobject_uevent_init(void) postcore_initcall(kobject_uevent_init); #endif + +#ifdef CONFIG_UEVENT_HELPER +static const struct ctl_table uevent_helper_sysctl_table[] = { + { + .procname = "hotplug", + .data = &uevent_helper, + .maxlen = UEVENT_HELPER_PATH_LEN, + .mode = 0644, + .proc_handler = proc_dostring, + }, +}; + +static int __init init_uevent_helper_sysctl(void) +{ + register_sysctl_init("kernel", uevent_helper_sysctl_table); + return 0; +} + +postcore_initcall(init_uevent_helper_sysctl); +#endif |