Messages in this thread | | | Date | Wed, 2 Feb 2011 15:38:58 +0200 | From | Gleb Natapov <> | Subject | Re: [PATCH] Fix EDD3.0 data verification. |
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On Wed, Feb 02, 2011 at 11:30:36AM -0200, Henrique de Moraes Holschuh wrote: > On Wed, 02 Feb 2011, Gleb Natapov wrote: > > Check for nonzero path in edd_has_edd30() has no sense. First, it looks > > at the wrong memory. Device path starts at offset 30 of the info->params > > structure which is at offset 8 from the beginning of info structure, but > > code looks at info + 4 instead. This was correct when code was introduced, > > but around v2.6.4 three more fields were added to edd_info structure > > (commit 66b61a5c in history.git). Second, even if it will check correct > > memory it will always succeed since at offset 30 (params->key) there will > > be non-zero values otherwise previous check would fail. > > Hmm, would that be a reason for boot lockups on some systems ? I've > seen that happen on Intel D875PBZ and Debian stable (2.6.26). We > dropped EDD support then. > Unlikely. Edd module is not loaded by default and the code that the patch changes works on in-memory data that was read from BIOS during boot. It is theoretically possible that BIOS, that works according to phoenix spec, will do something bad when int13_48 is called with buffer bigger then 66 bytes, but my patch does not fix that.
-- Gleb.
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