Re: [PATCH v4 1/6] powerpc/book3s64/kuap: Improve error reporting with KUAP

[Michael Ellerman]

On Wed, 9 Dec 2020 05:29:20 +0000 (UTC), Christophe Leroy wrote:
> This partially reverts commit eb232b162446 ("powerpc/book3s64/kuap: Improve
> error reporting with KUAP") and update the fault handler to print
> 
> [   55.022514] Kernel attempted to access user page (7e6725b70000) - exploit attempt? (uid: 0)
> [   55.022528] BUG: Unable to handle kernel data access on read at 0x7e6725b70000
> [   55.022533] Faulting instruction address: 0xc000000000e8b9bc
> [   55.022540] Oops: Kernel access of bad area, sig: 11 [#1]
> ....
> 
> [...]

Patches 2-6 applied to powerpc/next.

[2/6] powerpc/mm: sanity_check_fault() should work for all, not only BOOK3S
      https://git.kernel.org/powerpc/c/7ceb40027e19567a0a066e3b380cc034cdd9a124
[3/6] powerpc/fault: Unnest definition of page_fault_is_write() and page_fault_is_bad()
      https://git.kernel.org/powerpc/c/5250d026d241febfaf226d26cabe528fc478e225
[4/6] powerpc/mm: Move the WARN() out of bad_kuap_fault()
      https://git.kernel.org/powerpc/c/3dc12dfe74300febc568c3b530c0f9bee01f2821
[5/6] powerpc/fault: Avoid heavy search_exception_tables() verification
      https://git.kernel.org/powerpc/c/cbd7e6ca0210db05c315a27bb5db5a482f2772ce
[6/6] powerpc/fault: Perform exception fixup in do_page_fault()
      https://git.kernel.org/powerpc/c/5f1888a077069988218805534f56b983b6d5710c

cheers