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Subjectioperm bitmap stuff for 2.4
[ let's see if three is the charm, the two previous attempts didnt make 
it to the list... ]

Hi people,


Is the ioperm patch necessary in 2.4 also? The fix by Brian Gerst was
commited to the 2.5 branch
(http://marc.theaimsgroup.com/?l=bk-commits-head&m=105275597307968&w=2)
some days ago, and as of yesterday vendors are starting to ship a similar
fix to their kernels, so I suppose it is indeed necessary. What about the
attached patch? It applies to both 2.4.20 and .21-rc2, please review.


(Please forgive me if this has been discussed before, I did a quick
search of the lkml archives and couldnt find anything relevant to 2.4)



Cheers,

Nuno
--- linux-2.4.20-gw3/arch/i386/kernel/ioport.c 2003-05-16 23:42:47.000000000 +0100
+++ linux-2.4.20-gw4/arch/i386/kernel/ioport.c 2003-05-16 23:42:49.000000000 +0100
@@ -72,17 +72,18 @@
*/
memset(t->io_bitmap,0xff,(IO_BITMAP_SIZE+1)*4);
t->ioperm = 1;
- /*
- * this activates it in the TSS
- */
- tss->bitmap = IO_BITMAP_OFFSET;
}

/*
* do it in the per-thread copy and in the TSS ...
*/
set_bitmap(t->io_bitmap, from, num, !turn_on);
- set_bitmap(tss->io_bitmap, from, num, !turn_on);
+ if (tss->bitmap == IO_BITMAP_OFFSET) { /* already active? */
+ set_bitmap(tss->io_bitmap, from, num, !turn_on);
+ } else {
+ memcpy(tss->io_bitmap, t->io_bitmap, IO_BITMAP_SIZE);
+ tss->bitmap = IO_BITMAP_OFFSET; /* Activate it in the TSS */
+ }

return 0;
}
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