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2.0.21
libfwupdplugin/fu-kernel.c
448 строк
11 KB
Richard Hughes
Add fu_path_build() to avoid an extra alloc when building a known path
19 ноя 2025, 11:06
19 ноя 2025, 11:06
d1ea543
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/* * Copyright 2017 Richard Hughes <richard@hughsie.com> * * SPDX-License-Identifier: LGPL-2.1-or-later */ #define G_LOG_DOMAIN "FuCommon" #include "config.h" #include <errno.h> #include <glib/gstdio.h> #ifdef HAVE_UTSNAME_H #include <sys/utsname.h> #endif #include "fu-input-stream.h" #include "fu-kernel.h" #include "fu-path.h" #include "fu-string.h" #include "fu-version-common.h" /** * fu_kernel_locked_down: * * Determines if kernel lockdown in effect * * Since: 1.8.2 **/ gboolean fu_kernel_locked_down(void) { #ifdef __linux__ gsize len = 0; g_autofree gchar *fname = fu_path_build(FU_PATH_KIND_SYSFSDIR_SECURITY, "lockdown", NULL); g_autofree gchar *data = NULL; g_auto(GStrv) options = NULL; if (!g_file_test(fname, G_FILE_TEST_EXISTS)) return FALSE; if (!g_file_get_contents(fname, &data, &len, NULL)) return FALSE; if (len < 1) return FALSE; options = g_strsplit(data, " ", -1); for (guint i = 0; options[i] != NULL; i++) { if (g_strcmp0(options[i], "[none]") == 0) return FALSE; } return TRUE; #else return FALSE; #endif } /** * fu_kernel_check_version: * @minimum_kernel: (not nullable): The minimum kernel version to check against * @error: (nullable): optional return location for an error * * Determines if the system is running at least a certain required kernel version * * Since: 1.8.2 **/ gboolean fu_kernel_check_version(const gchar *minimum_kernel, GError **error) { #ifdef HAVE_UTSNAME_H struct utsname name_tmp = {0}; g_return_val_if_fail(error == NULL || *error == NULL, FALSE); g_return_val_if_fail(minimum_kernel != NULL, FALSE); if (uname(&name_tmp) < 0) { g_set_error_literal(error, FWUPD_ERROR, FWUPD_ERROR_INTERNAL, "failed to read kernel version"); return FALSE; } if (fu_version_compare(name_tmp.release, minimum_kernel, FWUPD_VERSION_FORMAT_TRIPLET) < 0) { g_set_error(error, FWUPD_ERROR, FWUPD_ERROR_INTERNAL, "kernel %s doesn't meet minimum %s", name_tmp.release, minimum_kernel); return FALSE; } return TRUE; #else g_set_error_literal(error, FWUPD_ERROR, FWUPD_ERROR_INTERNAL, "platform doesn't support checking for minimum Linux kernel"); return FALSE; #endif } typedef struct { GHashTable *hash; GHashTable *values; } FuKernelConfigHelper; static gboolean fu_kernel_parse_config_line_cb(GString *token, guint token_idx, gpointer user_data, GError **error) { g_auto(GStrv) kv = NULL; FuKernelConfigHelper *helper = (FuKernelConfigHelper *)user_data; GRefString *value; if (token->len == 0) return TRUE; if (token->str[0] == '#') return TRUE; kv = g_strsplit(token->str, "=", 2); if (g_strv_length(kv) != 2) { g_set_error(error, FWUPD_ERROR, FWUPD_ERROR_INVALID_DATA, "invalid format for '%s'", token->str); return FALSE; } value = g_hash_table_lookup(helper->values, kv[1]); if (value != NULL) { g_hash_table_insert(helper->hash, g_strdup(kv[0]), g_ref_string_acquire(value)); } else { g_hash_table_insert(helper->hash, g_strdup(kv[0]), g_ref_string_new(kv[1])); } return TRUE; } /** * fu_kernel_parse_config: * @buf: (not nullable): cmdline to parse * @bufsz: size of @bufsz * * Parses all the kernel options into a hash table. Commented out options are not included. * * Returns: (transfer container) (element-type utf8 utf8): config keys * * Since: 1.9.6 **/ GHashTable * fu_kernel_parse_config(const gchar *buf, gsize bufsz, GError **error) { g_autoptr(GHashTable) hash = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, (GDestroyNotify)g_ref_string_release); g_autoptr(GHashTable) values = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, (GDestroyNotify)g_ref_string_release); FuKernelConfigHelper helper = {.hash = hash, .values = values}; const gchar *value_keys[] = {"y", "m", "0", NULL}; g_return_val_if_fail(buf != NULL, NULL); g_return_val_if_fail(error == NULL || *error == NULL, NULL); /* add 99.9% of the most common keys to avoid thousands of small allocations */ for (guint i = 0; value_keys[i] != NULL; i++) { g_hash_table_insert(values, (gpointer)value_keys[i], g_ref_string_new(value_keys[i])); } if (!fu_strsplit_full(buf, bufsz, "\n", fu_kernel_parse_config_line_cb, &helper, error)) return NULL; return g_steal_pointer(&hash); } #ifdef __linux__ static gchar * fu_kernel_get_config_path(GError **error) { #ifdef HAVE_UTSNAME_H struct utsname name_tmp; g_autofree gchar *config_fn = NULL; memset(&name_tmp, 0, sizeof(struct utsname)); if (uname(&name_tmp) < 0) { g_set_error_literal(error, FWUPD_ERROR, FWUPD_ERROR_INTERNAL, "failed to read kernel version"); return NULL; } config_fn = g_strdup_printf("config-%s", name_tmp.release); return fu_path_build(FU_PATH_KIND_HOSTFS_BOOT, config_fn, NULL); #else g_set_error_literal(error, FWUPD_ERROR, FWUPD_ERROR_INTERNAL, "platform does not support uname"); return NULL; #endif } #endif /** * fu_kernel_get_config: * @error: (nullable): optional return location for an error * * Loads all the kernel options into a hash table. Commented out options are not included. * * Returns: (transfer container) (element-type utf8 utf8): options from the kernel * * Since: 1.8.5 **/ GHashTable * fu_kernel_get_config(GError **error) { #ifdef __linux__ gsize bufsz = 0; g_autofree gchar *buf = NULL; g_autofree gchar *fn = NULL; g_autofree gchar *config_fngz = fu_path_build(FU_PATH_KIND_PROCFS, "config.gz", NULL); g_return_val_if_fail(error == NULL || *error == NULL, NULL); /* try /proc/config.gz -- which will only work with CONFIG_IKCONFIG */ if (g_file_test(config_fngz, G_FILE_TEST_EXISTS)) { g_autoptr(GBytes) payload = NULL; g_autoptr(GConverter) conv = NULL; g_autoptr(GFile) file = g_file_new_for_path(config_fngz); g_autoptr(GInputStream) istream1 = NULL; g_autoptr(GInputStream) istream2 = NULL; istream1 = G_INPUT_STREAM(g_file_read(file, NULL, error)); if (istream1 == NULL) return NULL; conv = G_CONVERTER(g_zlib_decompressor_new(G_ZLIB_COMPRESSOR_FORMAT_GZIP)); istream2 = g_converter_input_stream_new(istream1, conv); payload = fu_input_stream_read_bytes(istream2, 0, G_MAXSIZE, NULL, error); if (payload == NULL) return NULL; return fu_kernel_parse_config(g_bytes_get_data(payload, NULL), g_bytes_get_size(payload), error); } /* fall back to /boot/config-$(uname -r) */ fn = fu_kernel_get_config_path(error); if (fn == NULL) return NULL; if (!g_file_get_contents(fn, &buf, &bufsz, error)) return NULL; return fu_kernel_parse_config(buf, bufsz, error); #else g_set_error_literal(error, FWUPD_ERROR, FWUPD_ERROR_INTERNAL, "platform does not support getting the kernel config"); return NULL; #endif } /** * fu_kernel_parse_cmdline: * @buf: (not nullable): cmdline to parse * @bufsz: size of @bufsz * * Parses all the kernel key/values into a hash table, respecting double quotes when required. * * Returns: (transfer container) (element-type utf8 utf8): keys from the cmdline * * Since: 1.9.1 **/ GHashTable * fu_kernel_parse_cmdline(const gchar *buf, gsize bufsz) { gboolean is_escape = FALSE; g_autoptr(GHashTable) hash = NULL; g_autoptr(GString) acc = g_string_new(NULL); g_return_val_if_fail(buf != NULL, NULL); hash = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, g_free); if (bufsz == 0) return g_steal_pointer(&hash); for (gsize i = 0; i < bufsz; i++) { if (!is_escape && (buf[i] == ' ' || buf[i] == '\n') && acc->len > 0) { g_auto(GStrv) kv = g_strsplit(acc->str, "=", 2); g_hash_table_insert(hash, g_strdup(kv[0]), g_strdup(kv[1])); g_string_set_size(acc, 0); continue; } if (buf[i] == '"') { is_escape = !is_escape; continue; } g_string_append_c(acc, buf[i]); } if (acc->len > 0) { g_auto(GStrv) kv = g_strsplit(acc->str, "=", 2); g_hash_table_insert(hash, g_strdup(kv[0]), g_strdup(kv[1])); } /* success */ return g_steal_pointer(&hash); } /** * fu_kernel_get_cmdline: * @error: (nullable): optional return location for an error * * Loads all the kernel /proc/cmdline key/values into a hash table. * * Returns: (transfer container) (element-type utf8 utf8): keys from the kernel command line * * Since: 1.8.5 **/ GHashTable * fu_kernel_get_cmdline(GError **error) { #ifdef __linux__ gsize bufsz = 0; g_autofree gchar *buf = NULL; g_return_val_if_fail(error == NULL || *error == NULL, NULL); if (!g_file_get_contents("/proc/cmdline", &buf, &bufsz, error)) return NULL; return fu_kernel_parse_cmdline(buf, bufsz); #else g_set_error_literal(error, FWUPD_ERROR, FWUPD_ERROR_INTERNAL, "platform does not support getting the kernel cmdline"); return NULL; #endif } gboolean fu_kernel_check_cmdline_mutable(GError **error) { g_autofree gchar *grubby_path = NULL; g_auto(GStrv) config_files = g_new0(gchar *, 3); /* not found */ grubby_path = fu_path_find_program("grubby", error); if (grubby_path == NULL) return FALSE; /* check all the config files are writable */ config_files[0] = fu_path_build(FU_PATH_KIND_HOSTFS_BOOT, "grub2", "grub.cfg", NULL); config_files[1] = fu_path_build(FU_PATH_KIND_SYSCONFDIR, "grub.cfg", NULL); for (guint i = 0; config_files[i] != NULL; i++) { g_autoptr(GFile) file = g_file_new_for_path(config_files[i]); g_autoptr(GFileInfo) info = NULL; g_autoptr(GError) error_local = NULL; if (!g_file_query_exists(file, NULL)) continue; info = g_file_query_info(file, G_FILE_ATTRIBUTE_ACCESS_CAN_WRITE, G_FILE_QUERY_INFO_NONE, NULL, &error_local); if (info == NULL) { g_warning("failed to get info for %s: %s", config_files[i], error_local->message); continue; } if (!g_file_info_get_attribute_boolean(info, G_FILE_ATTRIBUTE_ACCESS_CAN_WRITE)) { g_set_error(error, FWUPD_ERROR, FWUPD_ERROR_NOT_SUPPORTED, "%s is not writable", config_files[i]); return FALSE; } } /* success */ return TRUE; } static gboolean fu_kernel_set_commandline(const gchar *arg, gboolean enable, GError **error) { g_autofree gchar *output = NULL; g_autofree gchar *arg_string = NULL; g_autofree gchar *grubby_path = NULL; const gchar *argv_grubby[] = {"", "--update-kernel=DEFAULT", "", NULL}; grubby_path = fu_path_find_program("grubby", error); if (grubby_path == NULL) { g_prefix_error_literal(error, "failed to find grubby: "); return FALSE; } if (enable) arg_string = g_strdup_printf("--args=%s", arg); else arg_string = g_strdup_printf("--remove-args=%s", arg); argv_grubby[0] = grubby_path; argv_grubby[2] = arg_string; return g_spawn_sync(NULL, (gchar **)argv_grubby, NULL, G_SPAWN_DEFAULT, NULL, NULL, &output, NULL, NULL, error); } /** * fu_kernel_add_cmdline_arg: * @arg: (not nullable): key to set * @error: (nullable): optional return location for an error * * Add a kernel command line argument. * * Returns: %TRUE if successful * * Since: 1.9.5 **/ gboolean fu_kernel_add_cmdline_arg(const gchar *arg, GError **error) { return fu_kernel_set_commandline(arg, TRUE, error); } /** * fu_kernel_remove_cmdline_arg: * @arg: (not nullable): key to set * @error: (nullable): optional return location for an error * * Remove a kernel command line argument. * * Returns: %TRUE if successful * * Since: 1.9.5 **/ gboolean fu_kernel_remove_cmdline_arg(const gchar *arg, GError **error) { return fu_kernel_set_commandline(arg, FALSE, error); }