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Diffstat (limited to 'init')
-rw-r--r--init/Kconfig14
-rw-r--r--init/main.c229
2 files changed, 226 insertions, 17 deletions
diff --git a/init/Kconfig b/init/Kconfig
index 24b23d843df1..cfee56c151f1 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1224,6 +1224,20 @@ source "usr/Kconfig"
endif
+config BOOT_CONFIG
+ bool "Boot config support"
+ depends on BLK_DEV_INITRD
+ select LIBXBC
+ default y
+ help
+ Extra boot config allows system admin to pass a config file as
+ complemental extension of kernel cmdline when booting.
+ The boot config file must be attached at the end of initramfs
+ with checksum and size.
+ See <file:Documentation/admin-guide/bootconfig.rst> for details.
+
+ If unsure, say Y.
+
choice
prompt "Compiler optimization level"
default CC_OPTIMIZE_FOR_PERFORMANCE
diff --git a/init/main.c b/init/main.c
index d8c7e86c2d28..cc0ee4873419 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>
@@ -136,8 +137,10 @@ 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;
static char *execute_command;
static char *ramdisk_execute_command;
@@ -245,6 +248,156 @@ static int __init loglevel(char *str)
early_param("loglevel", loglevel);
+#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;
+ char c = '\"';
+ 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);
+ ret = snprintf(buf, rest(buf, end), "%s%c", xbc_namebuf,
+ vnode ? '=' : ' ');
+ if (ret < 0)
+ return ret;
+ buf += ret;
+ if (!vnode)
+ continue;
+
+ c = '\"';
+ xbc_array_for_each_value(vnode, val) {
+ ret = snprintf(buf, rest(buf, end), "%c%s", c, val);
+ if (ret < 0)
+ return ret;
+ buf += ret;
+ c = ',';
+ }
+ if (rest(buf, end) > 2)
+ strcpy(buf, "\" ");
+ buf += 2;
+ }
+
+ 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;
+}
+
+u32 boot_config_checksum(unsigned char *p, u32 size)
+{
+ u32 ret = 0;
+
+ while (size--)
+ ret += *p++;
+
+ return ret;
+}
+
+static void __init setup_boot_config(const char *cmdline)
+{
+ u32 size, csum;
+ char *data, *copy;
+ const char *p;
+ u32 *hdr;
+ int ret;
+
+ p = strstr(cmdline, "bootconfig");
+ if (!p || (p != cmdline && !isspace(*(p-1))) ||
+ (p[10] && !isspace(p[10])))
+ return;
+
+ if (!initrd_end)
+ goto not_found;
+
+ hdr = (u32 *)(initrd_end - 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)
+#endif
+
/* Change NUL term back to "=", to make "param" the whole string. */
static void __init repair_env_string(char *param, char *val)
{
@@ -373,22 +526,50 @@ 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 (!strstr(boot_command_line, " -- ")) {
+ strcpy(saved_command_line + len, " -- ");
+ len += 4;
+ } else
+ saved_command_line[len++] = ' ';
+
+ strcpy(saved_command_line + len, extra_init_args);
+ }
}
/*
@@ -595,6 +776,7 @@ 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();
@@ -604,7 +786,7 @@ 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();
@@ -615,6 +797,9 @@ 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
@@ -996,13 +1181,12 @@ static int __init ignore_unknown_bootoption(char *param, char *val,
return 0;
}
-static void __init do_initcall_level(int level)
+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, ignore_unknown_bootoption);
@@ -1015,9 +1199,20 @@ 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;
+
+ 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);
+ }
- for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++)
- do_initcall_level(level);
+ kfree(command_line);
}
/*