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Disallow writes to readonly file

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Sparchatus 2022-05-31 09:59:12 +00:00
parent 1ed8746541
commit 5843870c1d
1 changed files with 5 additions and 0 deletions
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5
lib/fs/fat32.c
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@ -1526,6 +1526,11 @@ static errval_t _fat32_fwrite(struct fat32 *fat32, struct fat32_handle *file_han
err = fat32_read_directory_entry(fat32, file_handle->directory_entry_ref, &directory_entry);
if (err_is_fail(err)) return err;
// check if the directory entry is readonly
if (directory_entry.attributes & FAT32_ATTR_READ_ONLY) {
return FS_ERR_WRITE;
}
// if the current position in the file is past the end we need to increase the file size accordingly
if (file_handle->byte_offset >= directory_entry.file_size || file_handle->current_cluster == 0) {
// debug_printf("Invalid current cluster %u, updating it: %u (%lu)\n", file_handle->current_cluster, file_handle->first_cluster, file_handle->byte_offset);