diff options
Diffstat (limited to 'src/shared/efivars.c')
| -rw-r--r-- | src/shared/efivars.c | 125 |
1 files changed, 33 insertions, 92 deletions
diff --git a/src/shared/efivars.c b/src/shared/efivars.c index c6b45d214b..40c4270f5e 100644 --- a/src/shared/efivars.c +++ b/src/shared/efivars.c @@ -169,10 +169,9 @@ int efi_set_variable( struct var { uint32_t attr; char buf[]; - } _packed_ *buf = NULL; - char *p = NULL; - int fd = -1; - int r; + } _packed_ * _cleanup_free_ buf = NULL; + _cleanup_free_ char *p = NULL; + _cleanup_close_ int fd = -1; assert(name); @@ -182,42 +181,23 @@ int efi_set_variable( return -ENOMEM; if (size == 0) { - r = unlink(p); - goto finish; + if (unlink(p) < 0) + return -errno; + return 0; } fd = open(p, O_WRONLY|O_CREAT|O_NOCTTY|O_CLOEXEC, 0644); - if (fd < 0) { - r = -errno; - goto finish; - } + if (fd < 0) + return -errno; buf = malloc(sizeof(uint32_t) + size); - if (!buf) { - r = -errno; - goto finish; - } + if (!buf) + return -ENOMEM; buf->attr = EFI_VARIABLE_NON_VOLATILE|EFI_VARIABLE_BOOTSERVICE_ACCESS|EFI_VARIABLE_RUNTIME_ACCESS; memcpy(buf->buf, value, size); - r = write(fd, buf, sizeof(uint32_t) + size); - if (r < 0) { - r = -errno; - goto finish; - } - - if ((size_t)r != sizeof(uint32_t) + size) { - r = -EIO; - goto finish; - } - -finish: - if (fd >= 0) - close(fd); - free(buf); - free(p); - return r; + return loop_write(fd, buf, sizeof(uint32_t) + size, false); } int efi_get_variable_string(sd_id128_t vendor, const char *name, char **p) { @@ -273,42 +253,17 @@ int efi_get_boot_option( sd_id128_t *part_uuid, char **path, bool *active) { - struct boot_option { - uint32_t attr; - uint16_t path_len; - uint16_t title[]; - } _packed_; - - struct drive_path { - uint32_t part_nr; - uint64_t part_start; - uint64_t part_size; - char signature[16]; - uint8_t mbr_type; - uint8_t signature_type; - } _packed_; - - struct device_path { - uint8_t type; - uint8_t sub_type; - uint16_t length; - union { - uint16_t path[0]; - struct drive_path drive; - }; - } _packed_; 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; + _cleanup_free_ char *s = NULL, *p = NULL; sd_id128_t p_uuid = SD_ID128_NULL; int err; - snprintf(boot_id, sizeof(boot_id), "Boot%04X", id); + xsprintf(boot_id, "Boot%04X", id); err = efi_get_variable(EFI_VENDOR_GLOBAL, boot_id, NULL, (void **)&buf, &l); if (err < 0) return err; @@ -322,10 +277,8 @@ int efi_get_boot_option( if (title) { s = utf16_to_utf8(header->title, title_size); - if (!s) { - err = -ENOMEM; - goto err; - } + if (!s) + return -ENOMEM; } if (header->path_len > 0) { @@ -375,20 +328,20 @@ int efi_get_boot_option( } } - if (title) + if (title) { *title = s; + s = NULL; + } if (part_uuid) *part_uuid = p_uuid; - if (path) + if (path) { *path = p; + p = NULL; + } if (active) *active = !!header->attr & LOAD_OPTION_ACTIVE; return 0; -err: - free(s); - free(p); - return err; } static void to_utf16(uint16_t *dest, const char *src) { @@ -439,13 +392,12 @@ int efi_add_boot_option(uint16_t id, const char *title, uint32_t part, uint64_t pstart, uint64_t psize, sd_id128_t part_uuid, const char *path) { char boot_id[9]; - char *buf; size_t size; size_t title_len; size_t path_len; struct boot_option *option; struct device_path *devicep; - int err; + _cleanup_free_ char *buf = NULL; title_len = (strlen(title)+1) * 2; path_len = (strlen(path)+1) * 2; @@ -453,10 +405,8 @@ int efi_add_boot_option(uint16_t id, const char *title, buf = calloc(sizeof(struct boot_option) + title_len + sizeof(struct drive_path) + sizeof(struct device_path) + path_len, 1); - if (!buf) { - err = -ENOMEM; - goto finish; - } + if (!buf) + return -ENOMEM; /* header */ option = (struct boot_option *)buf; @@ -496,18 +446,14 @@ int efi_add_boot_option(uint16_t id, const char *title, devicep->length = offsetof(struct device_path, path); size += devicep->length; - snprintf(boot_id, sizeof(boot_id), "Boot%04X", id); - err = efi_set_variable(EFI_VENDOR_GLOBAL, boot_id, buf, size); - -finish: - free(buf); - return err; + xsprintf(boot_id, "Boot%04X", id); + return efi_set_variable(EFI_VENDOR_GLOBAL, boot_id, buf, size); } int efi_remove_boot_option(uint16_t id) { char boot_id[9]; - snprintf(boot_id, sizeof(boot_id), "Boot%04X", id); + xsprintf(boot_id, "Boot%04X", id); return efi_set_variable(EFI_VENDOR_GLOBAL, boot_id, NULL, 0); } @@ -563,8 +509,8 @@ static int cmp_uint16(const void *_a, const void *_b) { int efi_get_boot_options(uint16_t **options) { _cleanup_closedir_ DIR *dir = NULL; struct dirent *de; - uint16_t *list = NULL; - int count = 0, r; + _cleanup_free_ uint16_t *list = NULL; + int count = 0; assert(options); @@ -572,7 +518,7 @@ int efi_get_boot_options(uint16_t **options) { if (!dir) return -errno; - FOREACH_DIRENT(de, dir, r = -errno; goto fail) { + FOREACH_DIRENT(de, dir, return -errno) { int id; uint16_t *t; @@ -590,10 +536,8 @@ int efi_get_boot_options(uint16_t **options) { continue; t = realloc(list, (count + 1) * sizeof(uint16_t)); - if (!t) { - r = -ENOMEM; - goto fail; - } + if (!t) + return -ENOMEM; list = t; list[count ++] = id; @@ -602,11 +546,8 @@ int efi_get_boot_options(uint16_t **options) { qsort_safe(list, count, sizeof(uint16_t), cmp_uint16); *options = list; + list = NULL; return count; - -fail: - free(list); - return r; } static int read_usec(sd_id128_t vendor, const char *name, usec_t *u) { |