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

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Date:   Tue, 15 Dec 2020 21:58:05 +1100 (AEDT)
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Paul Mackerras <paulus@...ba.org>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Michael Ellerman <mpe@...erman.id.au>, npiggin@...il.com,
        aneesh.kumar@...ux.ibm.com,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v4 1/6] powerpc/book3s64/kuap: Improve error reporting with KUAP

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