[Xen-devel] arm: Missing memset in setup_frametable_mappings

[vikrams@xxxxxxxxxxxxxx]

Hello Ian, Stefano,
I believe there is a bug in setup_frametable_mappings() where the function
allocates pages for pagetables via alloc_boot_pages() but does not zero them
out. This results in a crash on Qualcomm systems when prefetching is enabled
since the processor is free to prefetch a location for which it finds a
'valid'
translation in the page tables, but actually holds uninitialized memory.

A memset to 0 of the variable 'second' for the nr_second pages that were
allocated fixes the problem.

I didn't see a fix in master branch but may have missed a bug report on the
mailing list.

Thanks,
Vikram
Qualcomm Technologies Inc, on behalf of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux
Foundation Collaborative Project



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