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EXEC (func 0x4b): fix: do not crash if exMinAlloc == 0xffff 

Some ancient NE programs set exMinAlloc to 0xffff to signify
that they should not be run as normal MZ programs at all:

00000000  4d 5a 40 00 01 00 00 00  04 00 ff ff ff ff 00 00
00000010  00 00 00 00 00 00 00 00  40 00 00 00 00 00 00 00
00000020  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00
00000030  00 00 00 00 00 00 00 00  00 00 00 00 40 00 00 00
00000040  4e 45 04 00 9b 00 07 00  00 00 00 00 06 40 02 00
...

The kernel should reject these programs, rather than try to
run them (and crash the system).
This commit is contained in:
Tee-Kiah Chia 2019-11-06 00:15:57 +08:00 committed by Kenneth J Davis
parent 9d5abfe25a
commit 6f9648672e
1 changed files with 6 additions and 0 deletions
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6
kernel/task.c
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@ -587,6 +587,12 @@ COUNT DosExeLoader(BYTE FAR * namep, exec_blk * exp, COUNT mode, COUNT fd)
image_size += sizeof(psp) / 16; /* TE 03/20/01 */
exe_size = image_size + ExeHeader.exMinAlloc;
/* Some ancient NE programs set exMinAlloc to 0xffff to signify
that they should not be run as normal MZ programs at all. Check
for this and similar conditions. -- 2019/11/05 tkchia */
if (exe_size < image_size)
return DE_NOMEM;
/* Clone the environement and create a memory arena */
if (mode & 0x80)
{