Hi!
18-Авг-2006 11:26 [EMAIL PROTECTED] (Eric Auer) wrote to
freedos-devel@lists.sourceforge.net:
EA> I hope you also like my kernel patch for it...
EA> [... QuickBASIC frees a block, resizes another block to the max after
EA> finding the max size with resize to -1 size, then frees the first
EA> block again, which fails on FreeDOS as free invalidates the block ...]
EA> I would suggest the following patch for kernel 2036 (stable) -->
EA> +#if 0 /* this disturbs QB 4.x double-free... */
EA> q->m_type = 'K'; /* Invalidate the magic number */
EA> +#else
EA> + q->m_type = MCB_NORMAL; /* make QB 4.x happy... */
EA> + q->m_psp = FREE_PSP; /* leave MCB as "valid but free" */
EA> +#endif
First, not need to re-add header. Second, there should be added check,
that "segment points to block in chain", in DosMemChange(), to make
fool-prof.
EA> At least compiling the whole updated 2036 kernel under the
EA> updated 2036 kernel itself worked just fine... Well, after I
EA> removed the TSR instance of Quarterdeck MFT (now freeware)
EA> from RAM, that is, otherwise NASM ran out of memory ;-) .
? You wish to say, that with your patch there now not enough memory for
NASM after unloading MFT?
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