Re: [PATCH] ARM: fault: Implement copy_from_kernel_nofault_allowed()
From: Mark Brown
Date: Tue Jan 23 2024 - 14:07:19 EST
On Mon, Jan 22, 2024 at 05:12:38PM -0800, Kees Cook wrote:
> Under PAN emulation when dumping backtraces from things like the
> LKDTM EXEC_USERSPACE test[1], a double fault (which would hang a CPU)
> would happen because of dump_instr() attempting to read a userspace
> address. Make sure copy_from_kernel_nofault() does not attempt this
> any more.
This appears to fix the original issue:
https://lava.sirena.org.uk/scheduler/job/497571
(though so did your earlier patch) so:
Tested-by: Mark Brown <broonie@xxxxxxxxxx>
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