efi: various cleanups

6 files changed, 116 insertions, 51 deletions

diff --git a/src/boot/boot-efi.c b/src/boot/boot-efi.c
index 32cb973cf6..ac5f9c12a7 100644
--- a/src/boot/boot-efi.c
+++ b/src/boot/boot-efi.c
@@ -66,7 +66,7 @@ static int get_boot_entries(struct boot_info *info) {
                 memset(e, 0, sizeof(struct boot_info_entry));
                 e->order = -1;
 
-                err = efi_get_boot_option(id, NULL, &e->title, &e->part_uuid, &e->path, &e->data, &e->data_size);
+                err = efi_get_boot_option(id, &e->title, &e->part_uuid, &e->path);
                 if (err < 0)
                         break;
                 e->id = id;
@@ -103,11 +103,13 @@ static int find_active_entry(struct boot_info *info) {
 
 static int get_boot_order(struct boot_info *info) {
         size_t i, k;
-        int err;
+        int r;
 
-        err = efi_get_boot_order(&info->fw_entries_order, &info->fw_entries_order_count);
-        if (err < 0)
-                return err;
+        r = efi_get_boot_order(&info->fw_entries_order);
+        if (r < 0)
+                return r;
+
+        info->fw_entries_order_count = r;
 
         for (i = 0; i < info->fw_entries_order_count; i++) {
                 for (k = 0; k < info->fw_entries_count; k++) {
@@ -142,9 +144,9 @@ static int entry_cmp(const void *a, const void *b) {
 int boot_info_query(struct boot_info *info) {
         char str[64];
         char buf[64];
-        char *loader_active;
+        char *loader_active = NULL;
 
-        info->loader = efi_get_variable_string(EFI_VENDOR_LOADER, "LoaderInfo");
+        efi_get_variable_string(EFI_VENDOR_LOADER, "LoaderInfo", &info->loader);
 
         get_boot_entries(info);
         if (info->fw_entries_count > 0) {
@@ -153,19 +155,20 @@ int boot_info_query(struct boot_info *info) {
                 find_active_entry(info);
         }
 
-        info->fw_type = efi_get_variable_string(EFI_VENDOR_LOADER, "LoaderFirmwareType");
-        info->fw_info = efi_get_variable_string(EFI_VENDOR_LOADER, "LoaderFirmwareInfo");
-        info->loader_image_path = efi_get_variable_string(EFI_VENDOR_LOADER, "LoaderImageIdentifier");
+        efi_get_variable_string(EFI_VENDOR_LOADER, "LoaderFirmwareType", &info->fw_type);
+        efi_get_variable_string(EFI_VENDOR_LOADER, "LoaderFirmwareInfo", &info->fw_info);
+        efi_get_variable_string(EFI_VENDOR_LOADER, "LoaderImageIdentifier", &info->loader_image_path);
         efi_get_loader_device_part_uuid(&info->loader_part_uuid);
 
         boot_loader_read_entries(info);
-        loader_active = efi_get_variable_string(EFI_VENDOR_LOADER, "LoaderEntrySelected");
+        efi_get_variable_string(EFI_VENDOR_LOADER, "LoaderEntrySelected", &loader_active);
         if (loader_active) {
                 boot_loader_find_active_entry(info, loader_active);
                 free(loader_active);
         }
 
         snprintf(str, sizeof(str), "LoaderEntryOptions-%s", sd_id128_to_string(info->machine_id, buf));
-        info->loader_options_added = efi_get_variable_string(EFI_VENDOR_LOADER, str);
+        efi_get_variable_string(EFI_VENDOR_LOADER, str, &info->loader_options_added);
+
         return 0;
 }
diff --git a/src/boot/boot.h b/src/boot/boot.h
index 90e45ccd68..febee123d5 100644
--- a/src/boot/boot.h
+++ b/src/boot/boot.h
@@ -38,8 +38,6 @@ struct boot_info_entry {
         char *title;
         sd_id128_t part_uuid;
         char *path;
-        char *data;
-        size_t data_size;
 };
 
 struct boot_info {
diff --git a/src/core/mount-setup.c b/src/core/mount-setup.c
index 5b32474bbe..2cd0b60ba7 100644
--- a/src/core/mount-setup.c
+++ b/src/core/mount-setup.c
@@ -78,7 +78,7 @@ static const MountPoint mount_table[] = {
         { "securityfs", "/sys/kernel/security",      "securityfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV,
           NULL,       MNT_NONE },
         { "efivarfs",   "/sys/firmware/efi/efivars", "efivarfs",   NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV,
-          is_efiboot, MNT_NONE },
+          is_efi_boot, MNT_NONE },
         { "tmpfs",      "/dev/shm",                  "tmpfs",      "mode=1777", MS_NOSUID|MS_NODEV|MS_STRICTATIME,
           NULL,       MNT_FATAL|MNT_IN_CONTAINER },
         { "devpts",     "/dev/pts",                  "devpts",     "mode=620,gid=" STRINGIFY(TTY_GID), MS_NOSUID|MS_NOEXEC,
diff --git a/src/efi-boot-generator/efi-boot-generator.c b/src/efi-boot-generator/efi-boot-generator.c
index 1319c71201..88fa220d2f 100644
--- a/src/efi-boot-generator/efi-boot-generator.c
+++ b/src/efi-boot-generator/efi-boot-generator.c
@@ -49,7 +49,7 @@ int main(int argc, char *argv[]) {
 
         umask(0022);
 
-        if (!is_efiboot())
+        if (!is_efi_boot())
                 return EXIT_SUCCESS;
 
         if (dir_is_empty("/boot") <= 0)
diff --git a/src/shared/efivars.c b/src/shared/efivars.c
index e16c61029b..3e59ee5e7d 100644
--- a/src/shared/efivars.c
+++ b/src/shared/efivars.c
@@ -27,11 +27,17 @@
 #include "utf8.h"
 #include "efivars.h"
 
-bool is_efiboot(void) {
+bool is_efi_boot(void) {
         return access("/sys/firmware/efi", F_OK) >= 0;
 }
 
-int efi_get_variable(sd_id128_t vendor, const char *name, uint32_t *attribute, void **value, size_t *size) {
+int efi_get_variable(
+                sd_id128_t vendor,
+                const char *name,
+                uint32_t *attribute,
+                void **value,
+                size_t *size) {
+
         _cleanup_close_ int fd = -1;
         _cleanup_free_ char *p = NULL;
         uint32_t a;
@@ -61,7 +67,7 @@ int efi_get_variable(sd_id128_t vendor, const char *name, uint32_t *attribute, v
 
         n = read(fd, &a, sizeof(a));
         if (n < 0)
-                return (int) n;
+                return -errno;
         if (n != sizeof(a))
                 return -EIO;
 
@@ -92,15 +98,22 @@ int efi_get_variable(sd_id128_t vendor, const char *name, uint32_t *attribute, v
         return 0;
 }
 
-char *efi_get_variable_string(sd_id128_t vendor, const char *name) {
+int efi_get_variable_string(sd_id128_t vendor, const char *name, char **p) {
         _cleanup_free_ void *s = NULL;
         size_t ss;
-        int err;
+        int r;
+        char *x;
 
-        err = efi_get_variable(vendor, name, NULL, &s, &ss);
-        if (err < 0)
-                return NULL;
-        return utf16_to_utf8(s, ss);
+        r = efi_get_variable(vendor, name, NULL, &s, &ss);
+        if (r < 0)
+                return r;
+
+        x = utf16_to_utf8(s, ss);
+        if (!x)
+                return -ENOMEM;
+
+        *p = x;
+        return 0;
 }
 
 static size_t utf16_size(const uint16_t *s) {
@@ -108,6 +121,7 @@ static size_t utf16_size(const uint16_t *s) {
 
         while (s[l] > 0)
                 l++;
+
         return (l+1) * sizeof(uint16_t);
 }
 
@@ -131,7 +145,12 @@ static void efi_guid_to_id128(const void *guid, sd_id128_t *id128) {
         memcpy(&id128->bytes[8], uuid->u4, sizeof(uuid->u4));
 }
 
-int efi_get_boot_option(uint32_t id, uint32_t *attributes, char **title, sd_id128_t *part_uuid, char **path, char **data, size_t *data_size) {
+int efi_get_boot_option(
+                uint16_t id,
+                char **title,
+                sd_id128_t *part_uuid,
+                char **path) {
+
         struct boot_option {
                 uint32_t attr;
                 uint16_t path_len;
@@ -157,23 +176,20 @@ int efi_get_boot_option(uint32_t id, uint32_t *attributes, char **title, sd_id12
                 };
         } _packed_;
 
-        char boot_id[32];
-        _cleanup_free_ char *buf = NULL;
+        char boot_id[9];
+        _cleanup_free_ uint8_t *buf = NULL;
         size_t l;
         struct boot_option *header;
         size_t title_size;
         char *s = NULL;
         char *p = NULL;
         sd_id128_t p_uuid = SD_ID128_NULL;
-        char *d = NULL;
-        size_t d_size = 0;
         int err;
 
         snprintf(boot_id, sizeof(boot_id), "Boot%04X", id);
         err = efi_get_variable(EFI_VENDOR_GLOBAL, boot_id, NULL, (void **)&buf, &l);
         if (err < 0)
                 return err;
-
         if (l < sizeof(struct boot_option))
                 return -ENOENT;
 
@@ -189,7 +205,7 @@ int efi_get_boot_option(uint32_t id, uint32_t *attributes, char **title, sd_id12
         }
 
         if (header->path_len > 0) {
-                char *dbuf;
+                uint8_t *dbuf;
                 size_t dnext;
 
                 dbuf = buf + offsetof(struct boot_option, title) + title_size;
@@ -233,45 +249,92 @@ int efi_get_boot_option(uint32_t id, uint32_t *attributes, char **title, sd_id12
                 }
         }
 
-        *title = s;
+        if (title)
+                *title = s;
         if (part_uuid)
                 *part_uuid = p_uuid;
         if (path)
                 *path = p;
-        if (data)
-                *data = d;
-        if (data_size)
-                *data_size = d_size;
+
         return 0;
 err:
         free(s);
         free(p);
-        free(d);
         return err;
 }
 
-int efi_get_boot_order(uint16_t **order, size_t *count) {
+int efi_get_boot_order(uint16_t **order) {
         void *buf;
         size_t l;
-        int err;
+        int r;
 
-        err = efi_get_variable(EFI_VENDOR_GLOBAL, "BootOrder", NULL, &buf, &l);
-        if (err < 0)
-                return err;
+        r = efi_get_variable(EFI_VENDOR_GLOBAL, "BootOrder", NULL, &buf, &l);
+        if (r < 0)
+                return r;
 
-        if (l == 0) {
+        if (l <= 0) {
                 free(buf);
                 return -ENOENT;
         }
 
-        if ((l % sizeof(uint16_t) > 0)) {
+        if ((l % sizeof(uint16_t) > 0) ||
+            (l / sizeof(uint16_t) > INT_MAX)) {
                 free(buf);
                 return -EINVAL;
         }
 
         *order = buf;
-        *count = l / sizeof(uint16_t);
-        return 0;
+        return (int) (l / sizeof(uint16_t));
+}
+
+int efi_get_boot_options(uint16_t **options) {
+        _cleanup_closedir_ DIR *dir = NULL;
+        struct dirent *de;
+        uint16_t *list = NULL;
+        int count = 0;
+
+        assert(options);
+
+        dir = opendir("/sys/firmware/efi/efivars/");
+        if (!dir)
+                return -errno;
+
+        while ((de = readdir(dir))) {
+                size_t n;
+                int a, b, c, d;
+                uint16_t *t;
+
+                if (strncmp(de->d_name, "Boot", 4) != 0)
+                        continue;
+
+                n = strlen(de->d_name);
+                if (n != 45)
+                        continue;
+
+                if (strcmp(de->d_name + 8, "-8be4df61-93ca-11d2-aa0d-00e098032b8c") != 0)
+                        continue;
+
+                a = de->d_name[4];
+                b = de->d_name[5];
+                c = de->d_name[6];
+                d = de->d_name[7];
+
+                if (!isdigit(a) || !isdigit(b) || !isdigit(c) || !isdigit(d))
+                        continue;
+
+                t = realloc(list, (count + 1) * sizeof(uint16_t));
+                if (!t) {
+                        free(list);
+                        return -ENOMEM;
+                }
+
+                list = t;
+                list[count ++] = (a - '0') * 1000 + (b - '0') * 100 + (c - '0') * 10 + (d - '0');
+
+        }
+
+        *options = list;
+        return count;
 }
 
 static int read_usec(sd_id128_t vendor, const char *name, usec_t *u) {
diff --git a/src/shared/efivars.h b/src/shared/efivars.h
index d54cc433b2..380e038f69 100644
--- a/src/shared/efivars.h
+++ b/src/shared/efivars.h
@@ -31,13 +31,14 @@
 #define EFI_VENDOR_LOADER SD_ID128_MAKE(4a,67,b0,82,0a,4c,41,cf,b6,c7,44,0b,29,bb,8c,4f)
 #define EFI_VENDOR_GLOBAL SD_ID128_MAKE(8b,e4,df,61,93,ca,11,d2,aa,0d,00,e0,98,03,2b,8c)
 
-bool is_efiboot(void);
+bool is_efi_boot(void);
 
 int efi_get_variable(sd_id128_t vendor, const char *name, uint32_t *attribute, void **value, size_t *size);
-char *efi_get_variable_string(sd_id128_t vendor, const char *name);
+int efi_get_variable_string(sd_id128_t vendor, const char *name, char **p);
 
-int efi_get_boot_option(uint32_t nr, uint32_t *attributes, char **title, sd_id128_t *partuuid, char **path, char **data, size_t *data_size);
-int efi_get_boot_order(uint16_t **order, size_t *count);
+int efi_get_boot_option(uint16_t nr, char **title, sd_id128_t *partuuid, char **path);
+int efi_get_boot_order(uint16_t **order);
+int efi_get_boot_options(uint16_t **options);
 
 int efi_get_boot_timestamps(const dual_timestamp *n, dual_timestamp *firmware, dual_timestamp *loader);