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-rw-r--r--init/main.c81
1 files changed, 73 insertions, 8 deletions
diff --git a/init/main.c b/init/main.c
index 48655ceb66f4..17d47bcdf573 100644
--- a/init/main.c
+++ b/init/main.c
@@ -77,6 +77,7 @@
#include <linux/sched_clock.h>
#include <linux/context_tracking.h>
#include <linux/random.h>
+#include <linux/list.h>
#include <asm/io.h>
#include <asm/bugs.h>
@@ -203,13 +204,13 @@ EXPORT_SYMBOL(loops_per_jiffy);
static int __init debug_kernel(char *str)
{
- console_loglevel = 10;
+ console_loglevel = CONSOLE_LOGLEVEL_DEBUG;
return 0;
}
static int __init quiet_kernel(char *str)
{
- console_loglevel = 4;
+ console_loglevel = CONSOLE_LOGLEVEL_QUIET;
return 0;
}
@@ -379,7 +380,7 @@ static noinline void __init_refok rest_init(void)
* the init task will end up wanting to create kthreads, which, if
* we schedule it before we create kthreadd, will OOPS.
*/
- kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND);
+ kernel_thread(kernel_init, NULL, CLONE_FS);
numa_default_policy();
pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES);
rcu_read_lock();
@@ -507,7 +508,6 @@ asmlinkage __visible void __init start_kernel(void)
page_address_init();
pr_notice("%s", linux_banner);
setup_arch(&command_line);
- mm_init_owner(&init_mm, &init_task);
mm_init_cpumask(&init_mm);
setup_command_line(command_line);
setup_nr_cpu_ids();
@@ -629,9 +629,7 @@ asmlinkage __visible void __init start_kernel(void)
signals_init();
/* rootfs populating might need page-writeback */
page_writeback_init();
-#ifdef CONFIG_PROC_FS
proc_root_init();
-#endif
cgroup_init();
cpuset_init();
taskstats_init_early();
@@ -666,19 +664,83 @@ static void __init do_ctors(void)
bool initcall_debug;
core_param(initcall_debug, initcall_debug, bool, 0644);
+#ifdef CONFIG_KALLSYMS
+struct blacklist_entry {
+ struct list_head next;
+ char *buf;
+};
+
+static __initdata_or_module LIST_HEAD(blacklisted_initcalls);
+
+static int __init initcall_blacklist(char *str)
+{
+ char *str_entry;
+ struct blacklist_entry *entry;
+
+ /* str argument is a comma-separated list of functions */
+ do {
+ str_entry = strsep(&str, ",");
+ if (str_entry) {
+ pr_debug("blacklisting initcall %s\n", str_entry);
+ entry = alloc_bootmem(sizeof(*entry));
+ entry->buf = alloc_bootmem(strlen(str_entry) + 1);
+ strcpy(entry->buf, str_entry);
+ list_add(&entry->next, &blacklisted_initcalls);
+ }
+ } while (str_entry);
+
+ return 0;
+}
+
+static bool __init_or_module initcall_blacklisted(initcall_t fn)
+{
+ struct list_head *tmp;
+ struct blacklist_entry *entry;
+ char *fn_name;
+
+ fn_name = kasprintf(GFP_KERNEL, "%pf", fn);
+ if (!fn_name)
+ return false;
+
+ list_for_each(tmp, &blacklisted_initcalls) {
+ entry = list_entry(tmp, struct blacklist_entry, next);
+ if (!strcmp(fn_name, entry->buf)) {
+ pr_debug("initcall %s blacklisted\n", fn_name);
+ kfree(fn_name);
+ return true;
+ }
+ }
+
+ kfree(fn_name);
+ return false;
+}
+#else
+static int __init initcall_blacklist(char *str)
+{
+ pr_warn("initcall_blacklist requires CONFIG_KALLSYMS\n");
+ return 0;
+}
+
+static bool __init_or_module initcall_blacklisted(initcall_t fn)
+{
+ return false;
+}
+#endif
+__setup("initcall_blacklist=", initcall_blacklist);
+
static int __init_or_module do_one_initcall_debug(initcall_t fn)
{
ktime_t calltime, delta, rettime;
unsigned long long duration;
int ret;
- pr_debug("calling %pF @ %i\n", fn, task_pid_nr(current));
+ printk(KERN_DEBUG "calling %pF @ %i\n", fn, task_pid_nr(current));
calltime = ktime_get();
ret = fn();
rettime = ktime_get();
delta = ktime_sub(rettime, calltime);
duration = (unsigned long long) ktime_to_ns(delta) >> 10;
- pr_debug("initcall %pF returned %d after %lld usecs\n",
+ printk(KERN_DEBUG "initcall %pF returned %d after %lld usecs\n",
fn, ret, duration);
return ret;
@@ -690,6 +752,9 @@ int __init_or_module do_one_initcall(initcall_t fn)
int ret;
char msgbuf[64];
+ if (initcall_blacklisted(fn))
+ return -EPERM;
+
if (initcall_debug)
ret = do_one_initcall_debug(fn);
else