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-rw-r--r--init/main.c296
1 files changed, 269 insertions, 27 deletions
diff --git a/init/main.c b/init/main.c
index da1bc0b60a7d..ee4947af823f 100644
--- a/init/main.c
+++ b/init/main.c
@@ -28,6 +28,7 @@
#include <linux/initrd.h>
#include <linux/memblock.h>
#include <linux/acpi.h>
+#include <linux/bootconfig.h>
#include <linux/console.h>
#include <linux/nmi.h>
#include <linux/percpu.h>
@@ -63,7 +64,7 @@
#include <linux/lockdep.h>
#include <linux/kmemleak.h>
#include <linux/pid_namespace.h>
-#include <linux/device.h>
+#include <linux/device/driver.h>
#include <linux/kthread.h>
#include <linux/sched.h>
#include <linux/sched/init.h>
@@ -136,8 +137,19 @@ char __initdata boot_command_line[COMMAND_LINE_SIZE];
char *saved_command_line;
/* Command line for parameter parsing */
static char *static_command_line;
-/* Command line for per-initcall parameter parsing */
-static char *initcall_command_line;
+/* Untouched extra command line */
+static char *extra_command_line;
+/* Extra init arguments */
+static char *extra_init_args;
+
+#ifdef CONFIG_BOOT_CONFIG
+/* Is bootconfig on command line? */
+static bool bootconfig_found;
+static bool initargs_found;
+#else
+# define bootconfig_found false
+# define initargs_found false
+#endif
static char *execute_command;
static char *ramdisk_execute_command;
@@ -245,10 +257,178 @@ static int __init loglevel(char *str)
early_param("loglevel", loglevel);
-/* Change NUL term back to "=", to make "param" the whole string. */
-static int __init repair_env_string(char *param, char *val,
+#ifdef CONFIG_BOOT_CONFIG
+
+char xbc_namebuf[XBC_KEYLEN_MAX] __initdata;
+
+#define rest(dst, end) ((end) > (dst) ? (end) - (dst) : 0)
+
+static int __init xbc_snprint_cmdline(char *buf, size_t size,
+ struct xbc_node *root)
+{
+ struct xbc_node *knode, *vnode;
+ char *end = buf + size;
+ const char *val;
+ int ret;
+
+ xbc_node_for_each_key_value(root, knode, val) {
+ ret = xbc_node_compose_key_after(root, knode,
+ xbc_namebuf, XBC_KEYLEN_MAX);
+ if (ret < 0)
+ return ret;
+
+ vnode = xbc_node_get_child(knode);
+ if (!vnode) {
+ ret = snprintf(buf, rest(buf, end), "%s ", xbc_namebuf);
+ if (ret < 0)
+ return ret;
+ buf += ret;
+ continue;
+ }
+ xbc_array_for_each_value(vnode, val) {
+ ret = snprintf(buf, rest(buf, end), "%s=\"%s\" ",
+ xbc_namebuf, val);
+ if (ret < 0)
+ return ret;
+ buf += ret;
+ }
+ }
+
+ return buf - (end - size);
+}
+#undef rest
+
+/* Make an extra command line under given key word */
+static char * __init xbc_make_cmdline(const char *key)
+{
+ struct xbc_node *root;
+ char *new_cmdline;
+ int ret, len = 0;
+
+ root = xbc_find_node(key);
+ if (!root)
+ return NULL;
+
+ /* Count required buffer size */
+ len = xbc_snprint_cmdline(NULL, 0, root);
+ if (len <= 0)
+ return NULL;
+
+ new_cmdline = memblock_alloc(len + 1, SMP_CACHE_BYTES);
+ if (!new_cmdline) {
+ pr_err("Failed to allocate memory for extra kernel cmdline.\n");
+ return NULL;
+ }
+
+ ret = xbc_snprint_cmdline(new_cmdline, len + 1, root);
+ if (ret < 0 || ret > len) {
+ pr_err("Failed to print extra kernel cmdline.\n");
+ return NULL;
+ }
+
+ return new_cmdline;
+}
+
+static u32 boot_config_checksum(unsigned char *p, u32 size)
+{
+ u32 ret = 0;
+
+ while (size--)
+ ret += *p++;
+
+ return ret;
+}
+
+static int __init bootconfig_params(char *param, char *val,
const char *unused, void *arg)
{
+ if (strcmp(param, "bootconfig") == 0) {
+ bootconfig_found = true;
+ } else if (strcmp(param, "--") == 0) {
+ initargs_found = true;
+ }
+ return 0;
+}
+
+static void __init setup_boot_config(const char *cmdline)
+{
+ static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata;
+ u32 size, csum;
+ char *data, *copy;
+ u32 *hdr;
+ int ret;
+
+ strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE);
+ parse_args("bootconfig", tmp_cmdline, NULL, 0, 0, 0, NULL,
+ bootconfig_params);
+
+ if (!bootconfig_found)
+ return;
+
+ if (!initrd_end)
+ goto not_found;
+
+ data = (char *)initrd_end - BOOTCONFIG_MAGIC_LEN;
+ if (memcmp(data, BOOTCONFIG_MAGIC, BOOTCONFIG_MAGIC_LEN))
+ goto not_found;
+
+ hdr = (u32 *)(data - 8);
+ size = hdr[0];
+ csum = hdr[1];
+
+ if (size >= XBC_DATA_MAX) {
+ pr_err("bootconfig size %d greater than max size %d\n",
+ size, XBC_DATA_MAX);
+ return;
+ }
+
+ data = ((void *)hdr) - size;
+ if ((unsigned long)data < initrd_start)
+ goto not_found;
+
+ if (boot_config_checksum((unsigned char *)data, size) != csum) {
+ pr_err("bootconfig checksum failed\n");
+ return;
+ }
+
+ copy = memblock_alloc(size + 1, SMP_CACHE_BYTES);
+ if (!copy) {
+ pr_err("Failed to allocate memory for bootconfig\n");
+ return;
+ }
+
+ memcpy(copy, data, size);
+ copy[size] = '\0';
+
+ ret = xbc_init(copy);
+ if (ret < 0)
+ pr_err("Failed to parse bootconfig\n");
+ else {
+ pr_info("Load bootconfig: %d bytes %d nodes\n", size, ret);
+ /* keys starting with "kernel." are passed via cmdline */
+ extra_command_line = xbc_make_cmdline("kernel");
+ /* Also, "init." keys are init arguments */
+ extra_init_args = xbc_make_cmdline("init");
+ }
+ return;
+not_found:
+ pr_err("'bootconfig' found on command line, but no bootconfig found\n");
+}
+#else
+#define setup_boot_config(cmdline) do { } while (0)
+
+static int __init warn_bootconfig(char *str)
+{
+ pr_warn("WARNING: 'bootconfig' found on the kernel command line but CONFIG_BOOTCONFIG is not set.\n");
+ return 0;
+}
+early_param("bootconfig", warn_bootconfig);
+
+#endif
+
+/* Change NUL term back to "=", to make "param" the whole string. */
+static void __init repair_env_string(char *param, char *val)
+{
if (val) {
/* param=val or param="val"? */
if (val == param+strlen(param)+1)
@@ -256,11 +436,9 @@ static int __init repair_env_string(char *param, char *val,
else if (val == param+strlen(param)+2) {
val[-2] = '=';
memmove(val-1, val, strlen(val)+1);
- val--;
} else
BUG();
}
- return 0;
}
/* Anything after -- gets handed straight to init. */
@@ -272,7 +450,7 @@ static int __init set_init_arg(char *param, char *val,
if (panic_later)
return 0;
- repair_env_string(param, val, unused, NULL);
+ repair_env_string(param, val);
for (i = 0; argv_init[i]; i++) {
if (i == MAX_INIT_ARGS) {
@@ -292,14 +470,16 @@ static int __init set_init_arg(char *param, char *val,
static int __init unknown_bootoption(char *param, char *val,
const char *unused, void *arg)
{
- repair_env_string(param, val, unused, NULL);
+ size_t len = strlen(param);
+
+ repair_env_string(param, val);
/* Handle obsolete-style parameters */
if (obsolete_checksetup(param))
return 0;
/* Unused module parameter. */
- if (strchr(param, '.') && (!val || strchr(param, '.') < val))
+ if (strnchr(param, len, '.'))
return 0;
if (panic_later)
@@ -313,7 +493,7 @@ static int __init unknown_bootoption(char *param, char *val,
panic_later = "env";
panic_param = param;
}
- if (!strncmp(param, envp_init[i], val - param))
+ if (!strncmp(param, envp_init[i], len+1))
break;
}
envp_init[i] = param;
@@ -374,22 +554,51 @@ static inline void smp_prepare_cpus(unsigned int maxcpus) { }
*/
static void __init setup_command_line(char *command_line)
{
- size_t len = strlen(boot_command_line) + 1;
+ size_t len, xlen = 0, ilen = 0;
- saved_command_line = memblock_alloc(len, SMP_CACHE_BYTES);
- if (!saved_command_line)
- panic("%s: Failed to allocate %zu bytes\n", __func__, len);
+ if (extra_command_line)
+ xlen = strlen(extra_command_line);
+ if (extra_init_args)
+ ilen = strlen(extra_init_args) + 4; /* for " -- " */
- initcall_command_line = memblock_alloc(len, SMP_CACHE_BYTES);
- if (!initcall_command_line)
- panic("%s: Failed to allocate %zu bytes\n", __func__, len);
+ len = xlen + strlen(boot_command_line) + 1;
+
+ saved_command_line = memblock_alloc(len + ilen, SMP_CACHE_BYTES);
+ if (!saved_command_line)
+ panic("%s: Failed to allocate %zu bytes\n", __func__, len + ilen);
static_command_line = memblock_alloc(len, SMP_CACHE_BYTES);
if (!static_command_line)
panic("%s: Failed to allocate %zu bytes\n", __func__, len);
- strcpy(saved_command_line, boot_command_line);
- strcpy(static_command_line, command_line);
+ if (xlen) {
+ /*
+ * We have to put extra_command_line before boot command
+ * lines because there could be dashes (separator of init
+ * command line) in the command lines.
+ */
+ strcpy(saved_command_line, extra_command_line);
+ strcpy(static_command_line, extra_command_line);
+ }
+ strcpy(saved_command_line + xlen, boot_command_line);
+ strcpy(static_command_line + xlen, command_line);
+
+ if (ilen) {
+ /*
+ * Append supplemental init boot args to saved_command_line
+ * so that user can check what command line options passed
+ * to init.
+ */
+ len = strlen(saved_command_line);
+ if (initargs_found) {
+ saved_command_line[len++] = ' ';
+ } else {
+ strcpy(saved_command_line + len, " -- ");
+ len += 4;
+ }
+
+ strcpy(saved_command_line + len, extra_init_args);
+ }
}
/*
@@ -596,6 +805,7 @@ asmlinkage __visible void __init start_kernel(void)
pr_notice("%s", linux_banner);
early_security_init();
setup_arch(&command_line);
+ setup_boot_config(command_line);
setup_command_line(command_line);
setup_nr_cpu_ids();
setup_per_cpu_areas();
@@ -605,7 +815,7 @@ asmlinkage __visible void __init start_kernel(void)
build_all_zonelists(NULL);
page_alloc_init();
- pr_notice("Kernel command line: %s\n", boot_command_line);
+ pr_notice("Kernel command line: %s\n", saved_command_line);
/* parameters may set static keys */
jump_label_init();
parse_early_param();
@@ -616,6 +826,9 @@ asmlinkage __visible void __init start_kernel(void)
if (!IS_ERR_OR_NULL(after_dashes))
parse_args("Setting init args", after_dashes, NULL, 0, -1, -1,
NULL, set_init_arg);
+ if (extra_init_args)
+ parse_args("Setting extra init args", extra_init_args,
+ NULL, 0, -1, -1, NULL, set_init_arg);
/*
* These use large bootmem allocations and must precede
@@ -991,16 +1204,21 @@ static const char *initcall_level_names[] __initdata = {
"late",
};
-static void __init do_initcall_level(int level)
+static int __init ignore_unknown_bootoption(char *param, char *val,
+ const char *unused, void *arg)
+{
+ return 0;
+}
+
+static void __init do_initcall_level(int level, char *command_line)
{
initcall_entry_t *fn;
- strcpy(initcall_command_line, saved_command_line);
parse_args(initcall_level_names[level],
- initcall_command_line, __start___param,
+ command_line, __start___param,
__stop___param - __start___param,
level, level,
- NULL, &repair_env_string);
+ NULL, ignore_unknown_bootoption);
trace_initcall_level(initcall_level_names[level]);
for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++)
@@ -1010,9 +1228,20 @@ static void __init do_initcall_level(int level)
static void __init do_initcalls(void)
{
int level;
+ size_t len = strlen(saved_command_line) + 1;
+ char *command_line;
- for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++)
- do_initcall_level(level);
+ command_line = kzalloc(len, GFP_KERNEL);
+ if (!command_line)
+ panic("%s: Failed to allocate %zu bytes\n", __func__, len);
+
+ for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++) {
+ /* Parser modifies command_line, restore it each time */
+ strcpy(command_line, saved_command_line);
+ do_initcall_level(level, command_line);
+ }
+
+ kfree(command_line);
}
/*
@@ -1043,8 +1272,16 @@ static void __init do_pre_smp_initcalls(void)
static int run_init_process(const char *init_filename)
{
+ const char *const *p;
+
argv_init[0] = init_filename;
pr_info("Run %s as init process\n", init_filename);
+ pr_debug(" with arguments:\n");
+ for (p = argv_init; *p; p++)
+ pr_debug(" %s\n", *p);
+ pr_debug(" with environment:\n");
+ for (p = envp_init; *p; p++)
+ pr_debug(" %s\n", *p);
return do_execve(getname_kernel(init_filename),
(const char __user *const __user *)argv_init,
(const char __user *const __user *)envp_init);
@@ -1091,6 +1328,11 @@ static void mark_readonly(void)
} else
pr_info("Kernel memory protection disabled.\n");
}
+#elif defined(CONFIG_ARCH_HAS_STRICT_KERNEL_RWX)
+static inline void mark_readonly(void)
+{
+ pr_warn("Kernel memory protection not selected by kernel config.\n");
+}
#else
static inline void mark_readonly(void)
{