Re: [PATCH v4 2/7] powerpc/32s: Fix bad_kuap_fault()

[Michael Ellerman]

On Fri, 2020-01-24 at 11:54:40 UTC, Christophe Leroy wrote:
> At the moment, bad_kuap_fault() reports a fault only if a bad access
> to userspace occurred while access to userspace was not granted.
> 
> But if a fault occurs for a write outside the allowed userspace
> segment(s) that have been unlocked, bad_kuap_fault() fails to
> detect it and the kernel loops forever in do_page_fault().
> 
> Fix it by checking that the accessed address is within the allowed
> range.
> 
> Fixes: a68c31fc01ef ("powerpc/32s: Implement Kernel Userspace Access Protection")
> Cc: stable@xxxxxxxxxxxxxxx # v5.2+
> Signed-off-by: Christophe Leroy <christophe.leroy@xxxxxx>
> Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
> Link: https://lore.kernel.org/r/1e07c7de4ffdd9cda35d1ffe8258af75579d3e91.1579715466.git.christophe.leroy@xxxxxx

Patches 2-7 applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/6ec20aa2e510b6297906c45f009aa08b2d97269a

cheers