Linux-libre 4.6.2-gnu

2 files changed, 52 insertions, 31 deletions

diff --git a/init/Kconfig b/init/Kconfig
index 0d6bb5cf4..f7da6c96e 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -328,8 +328,9 @@ config CROSS_MEMORY_ATTACH
 	  See the man page for more details.
 
 config FHANDLE
-	bool "open by fhandle syscalls"
+	bool "open by fhandle syscalls" if EXPERT
 	select EXPORTFS
+	default y
 	help
 	  If you say Y here, a user level program will be able to map
 	  file names to handle and then later use the handle for
@@ -1107,10 +1108,10 @@ config CGROUP_PIDS
 	  is fairly trivial to reach PID exhaustion before you reach even a
 	  conservative kmemcg limit. As a result, it is possible to grind a
 	  system to halt without being limited by other cgroup policies. The
-	  PIDs cgroup subsystem is designed to stop this from happening.
+	  PIDs controller is designed to stop this from happening.
 
 	  It should be noted that organisational operations (such as attaching
-	  to a cgroup hierarchy will *not* be blocked by the PIDs subsystem),
+	  to a cgroup hierarchy will *not* be blocked by the PIDs controller),
 	  since the PIDs limit only affects a process's ability to fork, not to
 	  attach to a cgroup.
 
@@ -1505,6 +1506,28 @@ config KALLSYMS_ALL
 
 	   Say N unless you really need all symbols.
 
+config KALLSYMS_ABSOLUTE_PERCPU
+	bool
+	default X86_64 && SMP
+
+config KALLSYMS_BASE_RELATIVE
+	bool
+	depends on KALLSYMS
+	default !IA64 && !(TILE && 64BIT)
+	help
+	  Instead of emitting them as absolute values in the native word size,
+	  emit the symbol references in the kallsyms table as 32-bit entries,
+	  each containing a relative value in the range [base, base + U32_MAX]
+	  or, when KALLSYMS_ABSOLUTE_PERCPU is in effect, each containing either
+	  an absolute value in the range [0, S32_MAX] or a relative value in the
+	  range [base, base + S32_MAX], where base is the lowest relative symbol
+	  address encountered in the image.
+
+	  On 64-bit builds, this reduces the size of the address table by 50%,
+	  but more importantly, it results in entries whose values are build
+	  time constants, and no relocation pass is required at runtime to fix
+	  up the entries based on the runtime load address of the kernel.
+
 config PRINTK
 	default y
 	bool "Enable support for printk" if EXPERT
@@ -1843,9 +1866,9 @@ config SYSTEM_DATA_VERIFICATION
 	select SYSTEM_TRUSTED_KEYRING
 	select KEYS
 	select CRYPTO
+	select CRYPTO_RSA
 	select ASYMMETRIC_KEY_TYPE
 	select ASYMMETRIC_PUBLIC_KEY_SUBTYPE
-	select PUBLIC_KEY_ALGO_RSA
 	select ASN1
 	select OID_REGISTRY
 	select X509_CERTIFICATE_PARSER
diff --git a/init/main.c b/init/main.c
index 055106098..31f9f4da5 100644
--- a/init/main.c
+++ b/init/main.c
@@ -93,9 +93,6 @@ static int kernel_init(void *);
 extern void init_IRQ(void);
 extern void fork_init(void);
 extern void radix_tree_init(void);
-#ifndef CONFIG_DEBUG_RODATA
-static inline void mark_rodata_ro(void) { }
-#endif
 
 /*
  * Debug helper: via this flag we know that we are in 'early bootup code'
@@ -388,7 +385,6 @@ static noinline void __init_refok rest_init(void)
 	int pid;
 
 	rcu_scheduler_starting();
-	smpboot_thread_init();
 	/*
 	 * We need to spawn init first so that it obtains pid 1, however
 	 * the init task will end up wanting to create kthreads, which, if
@@ -452,20 +448,6 @@ void __init parse_early_param(void)
 	done = 1;
 }
 
-/*
- *	Activate the first processor.
- */
-
-static void __init boot_cpu_init(void)
-{
-	int cpu = smp_processor_id();
-	/* Mark the boot cpu "present", "online" etc for SMP and UP case */
-	set_cpu_online(cpu, true);
-	set_cpu_active(cpu, true);
-	set_cpu_present(cpu, true);
-	set_cpu_possible(cpu, true);
-}
-
 void __init __weak smp_setup_processor_id(void)
 {
 }
@@ -499,11 +481,6 @@ asmlinkage __visible void __init start_kernel(void)
 	char *command_line;
 	char *after_dashes;
 
-	/*
-	 * Need to run as early as possible, to initialize the
-	 * lockdep hash:
-	 */
-	lockdep_init();
 	set_task_stack_end_magic(&init_task);
 	smp_setup_processor_id();
 	debug_objects_early_init();
@@ -530,6 +507,7 @@ asmlinkage __visible void __init start_kernel(void)
 	setup_command_line(command_line);
 	setup_nr_cpu_ids();
 	setup_per_cpu_areas();
+	boot_cpu_state_init();
 	smp_prepare_boot_cpu();	/* arch-specific boot-cpu hooks */
 
 	build_all_zonelists(NULL, NULL);
@@ -727,7 +705,6 @@ static int __init initcall_blacklist(char *str)
 
 static bool __init_or_module initcall_blacklisted(initcall_t fn)
 {
-	struct list_head *tmp;
 	struct blacklist_entry *entry;
 	char *fn_name;
 
@@ -735,8 +712,7 @@ static bool __init_or_module initcall_blacklisted(initcall_t fn)
 	if (!fn_name)
 		return false;
 
-	list_for_each(tmp, &blacklisted_initcalls) {
-		entry = list_entry(tmp, struct blacklist_entry, next);
+	list_for_each_entry(entry, &blacklisted_initcalls, next) {
 		if (!strcmp(fn_name, entry->buf)) {
 			pr_debug("initcall %s blacklisted\n", fn_name);
 			kfree(fn_name);
@@ -928,6 +904,28 @@ static int try_to_run_init_process(const char *init_filename)
 
 static noinline void __init kernel_init_freeable(void);
 
+#ifdef CONFIG_DEBUG_RODATA
+static bool rodata_enabled = true;
+static int __init set_debug_rodata(char *str)
+{
+	return strtobool(str, &rodata_enabled);
+}
+__setup("rodata=", set_debug_rodata);
+
+static void mark_readonly(void)
+{
+	if (rodata_enabled)
+		mark_rodata_ro();
+	else
+		pr_info("Kernel memory protection disabled.\n");
+}
+#else
+static inline void mark_readonly(void)
+{
+	pr_warn("This architecture does not have kernel memory protection.\n");
+}
+#endif
+
 static int __ref kernel_init(void *unused)
 {
 	int ret;
@@ -936,7 +934,7 @@ static int __ref kernel_init(void *unused)
 	/* need to finish all async __init code before freeing the memory */
 	async_synchronize_full();
 	free_initmem();
-	mark_rodata_ro();
+	mark_readonly();
 	system_state = SYSTEM_RUNNING;
 	numa_default_policy();