Messages in this thread | | | Subject | Re: PROBLEM: x86 alignment check bug | From | Alan Cox <> | Date | Wed, 08 Sep 2004 14:26:35 +0100 |
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On Mer, 2004-09-08 at 00:51, Zachary Amsden wrote: > Exception reporting for alignment check violations on x86 is broken > (unfortunately, rather badly, and rather hard to fix). Look at the trap > function which fills in the si_addr field during an unaligned memory > access, 2.6.8.1-mm4+, arch/i386/kernel/traps.c, Line 522:
So it fills in a value with random data that should be zero. Ok thats hardly "badly".
> Clearly, this is not correct. Considering how difficult the fix is (the > kernel must disassemble the faulting instruction and use register > information to determine the faulting address)
It would be a nice extension although it would break other OS's if it used %cr2 for this since they use it for thread id.
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