+ check a possible buffer overflow when creating a temp file,
submitted by Christoph Mallon
+ remove stale struct definitions
+ clarify the use of dflag and remove useless checks
MFC after: 3 days
there was still one overflow possible. strlcpy is faster anyway
because it doesn't unexpectedly zero the entire length of the string
when copying short strings....
so dest[MAXPATHLEN] falls outside the buffer. This bug corrupted
arenas[0] defined in libc's malloc.c on PowerPC when kldxref is shared,
which triggered a delayed SIGSERV.
that immediately follows the only call to it. maketempfile() uses
mkstemp(), so the temporary file has already been opened and using
fopen() again just opens the file twice. This also fixes the invalid
mode used on the fopen().
While here, assign NULL to fxref after fclose() because we test for
fxref being !NULL to determine if we have the (temporary) hints file
open.
on variables read out of raw kld files. Unlike other platforms the value
will be in an Elf_Rela, not in the data section of the elf file.
Submitted by: Hartmut Brandt <brandt@fokus.gmd.de>
PR: 46730
Tested on: alpha (obrien), i386, sparc64
