wm: teppich

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envfs: add checks for length of files and file names

--- a/fs/envfs.c

+++ b/fs/envfs.c

@@ -90,6 +90,13 @@

 	if(envfs->state != READY)

 		envfs_init();

+	if(strlen(name) > NAME_MAX)

+		return NAME_TOO_LONG;

+

+	for(int i = 0 ; i < strlen(name) ; i++)

+		if(!isalpha(name[i]))

+			return INVALID_FILENAME;

+

 	f = envfs_create(name);

 	f->buf = malloc(strlen(buf));

 	strncpy(f->buf, buf, strlen(buf));