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COMMAND.COM的破解.(有关DIR /S/A的BUG.)

王朝other·作者佚名  2006-01-08
窄屏简体版  字體: |||超大  

I know what you are thinking, "what does this have to

do with Windows?".

You may be aware of a "bug" in Command.com's "Dir/s"

(Directory Search for a file/s) which skips Hidden

sub-directories (common in "Windows" (95/98)). The "bug"

is not setting the proper attribute to include hidden directories.

I have modified "Command.com" for MS Dos 6.0 to 7.1 on 5

computers.

If you have a Hex Editor, enter the Search string (without quotes)

"8B D4 B9 10 00 B4 4E CD 21 72 2C E8 ".

Replace the 10 with 16. Also verify that the 4th byte past E8 is

also a 10 and replace that with 16 too. NOTE: if the 2nd 10

is Not present (SHOULD BE) at the 4th pos/byte past E8, then abort

the modification.

VERIFY PROPER FIX: (Note: Original Command.com will have ".BAK")

Use Dos's file compare (FC) for binary files and type (without

quotes) "FC/B COMMAND.BAK COMMAND.COM".

Dos V6.2 Command.com:

00003BD3: 10 16

00003BDF: 10 16

Dos V7.1 Command.com:

0000A2D6: 10 16

0000A2E2: 10 16

Use this fixed version of Command.com and replace the other/s

in other directories, then RESTART your PC. NOTE: If you don't

replace others, you may get a system halt with a "invalid

command.com" message due to a mismatch (checksum of the first

Command.com installed during startup does not match a reloaded

Command.com).

Disassembled: (Note: I do NOT have a full Command.com disassemble)

8BD4 MOV DX,SP

B91000 MOV CX,0010h ;Bug ( "Plain" Directory, but not hidden

(or one with "System" Attr set))

B44E MOV AH,4Eh ;Find first (sub-directory)

CD21 INT 21h

722C JB 3D07h ;JB if NOT found. NOTE: 3D07h depends where you

disassemble, but 72 2C is constant

E8FBFD CALL 3AD9h ;(3AD9h Dos 6.2 which is different in Dos 7.1)

B91000 MOV CX,0010h ;Bug part 2

MOV AH,4Fh ;Find next (sub-directory)

INT 21h

John Augustine

 
 
 
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