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Author: h908714124

lib/kernel_efivars.c

@@ -19,54 +19,54 @@
 static char* kernel_efi_path = NULL;
 
 void kernel_variable_init(void) {
-	char fname[] = "/tmp/efi.XXXXXX";
-	char cmdline[256];
-	int fd, ret;
-	struct stat st;
-	char *buf;
+  char fname[] = "/tmp/efi.XXXXXX";
+  char cmdline[256];
+  int fd, ret;
+  struct stat st;
+  char *buf;
 
-	if (kernel_efi_path)
-		return;
-	mkstemp(fname);
-	snprintf(cmdline, sizeof(cmdline), "mount -l > %s", fname);
-	ret = system(cmdline);
-	if (WEXITSTATUS(ret) != 0)
-		/* hopefully stderr said what was wrong */
-		exit(1);
-	fd = open(fname, O_RDONLY);
-	unlink(fname);
-	if (fd < 0) {
-		fprintf(stderr, "Failed to open output of %s\n", cmdline);
-		exit(1);
-	}
-	if (fstat(fd, &st) < 0) {
-		perror("stat failed");
-		exit(1);
-	}
-	if (st.st_size == 0) {
-		fprintf(stderr, "No efivarfs filesystem is mounted\n");
-		exit(1);
-	}
-	buf = malloc(st.st_size);
-	read(fd, buf, st.st_size);
-	close(fd);
+  if (kernel_efi_path)
+    return;
+  mkstemp(fname);
+  snprintf(cmdline, sizeof(cmdline), "mount -l > %s", fname);
+  ret = system(cmdline);
+  if (WEXITSTATUS(ret) != 0)
+    /* hopefully stderr said what was wrong */
+    exit(1);
+  fd = open(fname, O_RDONLY);
+  unlink(fname);
+  if (fd < 0) {
+    fprintf(stderr, "Failed to open output of %s\n", cmdline);
+    exit(1);
+  }
+  if (fstat(fd, &st) < 0) {
+    perror("stat failed");
+    exit(1);
+  }
+  if (st.st_size == 0) {
+    fprintf(stderr, "No efivarfs filesystem is mounted\n");
+    exit(1);
+  }
+  buf = malloc(st.st_size);
+  read(fd, buf, st.st_size);
+  close(fd);
 
-	char *ptr = buf;
-	char path[512], type[512];
-	while (ptr < buf + st.st_size) {
-		int count;
+  char *ptr = buf;
+  char path[512], type[512];
+  while (ptr < buf + st.st_size) {
+    int count;
 
-		sscanf(ptr, "%*s on %s type %s %*[^\n]\n%n", path, type, &count);
-		ptr += count;
-		if (strcmp(type, "efivarfs") == 0)
-			break;
-	}
-	if (strcmp(type, "efivarfs") != 0) {
-		fprintf(stderr, "No efivarfs filesystem is mounted\n");
-		exit(1);
-	}
-	kernel_efi_path = malloc(strlen(path) + 1);
-	strcpy(kernel_efi_path, path);
+    sscanf(ptr, "%*s on %s type %s %*[^\n]\n%n", path, type, &count);
+    ptr += count;
+    if (strcmp(type, "efivarfs") == 0)
+      break;
+  }
+  if (strcmp(type, "efivarfs") != 0) {
+    fprintf(stderr, "No efivarfs filesystem is mounted\n");
+    exit(1);
+  }
+  kernel_efi_path = malloc(strlen(path) + 1);
+  strcpy(kernel_efi_path, path);
 }
 
 int set_variable(
@@ -75,24 +75,25 @@ int set_variable(
     uint32_t attributes,
     uint32_t size,
     void* buf) {
-	if (!kernel_efi_path)
-		return -EINVAL;
+  if (!kernel_efi_path)
+    return -EINVAL;
 
-	int varfs_len = strlen(var) + 48 + strlen(kernel_efi_path);
-	char* varfs = malloc(varfs_len);
-	char* newbuf = malloc(size + sizeof(attributes));
-	snprintf(varfs, varfs_len, "%s/%s-%s", kernel_efi_path,
-		 var, guid_to_str(guid));
-	int fd = open(varfs, O_RDWR|O_CREAT|O_TRUNC, 0644);
-	free(varfs);
-	if (fd < 0)
-		return errno;
-	memcpy(newbuf, &attributes, sizeof(attributes));
-	memcpy(newbuf + sizeof(attributes), buf, size);
-	
-	if (write(fd, newbuf, size + sizeof(attributes)) != size + sizeof(attributes))
-		return errno;
+  int varfs_len = strlen(var) + 48 + strlen(kernel_efi_path);
+  char* varfs = malloc(varfs_len);
+  char* newbuf = malloc(size + sizeof(attributes));
+  snprintf(varfs, varfs_len, "%s/%s-%s", kernel_efi_path,
+     var, guid_to_str(guid));
+  int fd = open(varfs, O_RDWR|O_CREAT|O_TRUNC, 0644);
+  free(varfs);
+  if (fd < 0)
+    return errno;
+  memcpy(newbuf, &attributes, sizeof(attributes));
+  memcpy(newbuf + sizeof(attributes), buf, size);
+  
+  ssize_t result = write(fd, newbuf, size + sizeof(attributes));
+  if (result != size + sizeof(attributes))
+    return errno;
 
-	close(fd);
-	return 0;
+  close(fd);
+  return 0;
 }