* [BUG] crypto: sun4i-ss: Random data corruption
@ 2016-03-13 12:40 Corentin LABBE
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From: Corentin LABBE @ 2016-03-13 12:40 UTC (permalink / raw)
To: linux-arm-kernel
Hello
I had some report of random data corruption of people using cryptsetup with my sun4i-ss driver (via AF_ALG).
Even if it is hard to hit, I could confirm it by continuously moving files on a LUKS encrypted FS and comparing hash of it before and after.
The corruption is always when deciphering the end of 512bytes sector and always of a length multiple of 4.
The only way of removing this random corruption is to transform all spinlock_bh by spinlock_irqsave.
In fact this problem is extremely similar to another bug that I have encountered (https://lkml.org/lkml/2015/10/11/47)
The only difference is that I do not need to remove SG_MITER_ATOMIC for removing the issue.
So my question remains nearly the same than on my first problem: Why disabling irq remove this data corruption ?
Any help/suggestions will be really appreciated since I doesn't understand why this fix works.
Regards
LABBE Corentin
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2016-03-13 12:40 [BUG] crypto: sun4i-ss: Random data corruption Corentin LABBE
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