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Subject: Re: [PATCH v7 00/11] KASAN for powerpc/32
From:   Christophe Leroy <christophe.leroy@c-s.fr>
To:     Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Paul Mackerras <paulus@samba.org>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Nicholas Piggin <npiggin@gmail.com>,
        "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
        Andrey Ryabinin <aryabinin@virtuozzo.com>,
        Alexander Potapenko <glider@google.com>,
        Dmitry Vyukov <dvyukov@google.com>,
        Daniel Axtens <dja@axtens.net>
Cc:     linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org,
        linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com
References: <cover.1551098214.git.christophe.leroy@c-s.fr>
Message-ID: <9134d1df-01d4-b498-a25c-3b29aa855c70@c-s.fr>
Date:   Mon, 25 Feb 2019 19:24:53 +0100
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Le 25/02/2019 à 14:48, Christophe Leroy a écrit :
> This series adds KASAN support to powerpc/32

Looks like only half of defconfigs build ok.

I hope I have now fixes everything. Will run on kisskb tonight and send 
out v8 tomorrow if everything is OK.

Christophe

> 
> Tested on nohash/32 (8xx) and book3s/32 (mpc832x ie 603).
> Boot tested on qemu mac99
> 
> Changes in v7:
> - split in several smaller patches
> - prom_init now has its own string functions
> - full deactivation of powerpc-optimised string functions when KASAN is active
> - shadow area now at a fixed place on very top of kernel virtual space.
> - Early static hash table for hash book3s/32.
> - Full support of both inline and outline instrumentation for both hash and nohash ppc32
> - Earlier full activation of kasan.
> 
> Changes in v6:
> - Fixed oops on module loading (due to access to RO shadow zero area).
> - Added support for hash book3s/32, thanks to Daniel's patch to differ KASAN activation.
> - Reworked handling of optimised string functions (dedicated patch for it)
> - Reordered some files to ease adding of book3e/64 support.
> 
> Changes in v5:
> - Added KASAN_SHADOW_OFFSET in Makefile, otherwise we fallback to KASAN_MINIMAL
> and some stuff like stack instrumentation is not performed
> - Moved calls to kasan_early_init() in head.S because stack instrumentation
> in machine_init was performed before the call to kasan_early_init()
> - Mapping kasan_early_shadow_page RW in kasan_early_init() and
> remaping RO later in kasan_init()
> - Allocating a big memblock() for shadow area, falling back to PAGE_SIZE blocks in case of failure.
> 
> Changes in v4:
> - Comments from Andrey (DISABLE_BRANCH_PROFILING, Activation of reports)
> - Proper initialisation of shadow area in kasan_init()
> - Panic in case Hash table is required.
> - Added comments in patch one to explain why *t = *s becomes memcpy(t, s, ...)
> - Call of kasan_init_tags()
> 
> Changes in v3:
> - Removed the printk() in kasan_early_init() to avoid build failure (see https://github.com/linuxppc/issues/issues/218)
> - Added necessary changes in asm/book3s/32/pgtable.h to get it work on powerpc 603 family
> - Added a few KASAN_SANITIZE_xxx.o := n to successfully boot on powerpc 603 family
> 
> Changes in v2:
> - Rebased.
> - Using __set_pte_at() to build the early table.
> - Worked around and got rid of the patch adding asm/page.h in asm/pgtable-types.h
>      ==> might be fixed independently but not needed for this serie.
> 
> Christophe Leroy (11):
>    powerpc/32: Move early_init() in a separate file
>    powerpc: prepare string/mem functions for KASAN
>    powerpc/prom_init: don't use string functions from lib/
>    powerpc/mm: don't use direct assignation during early boot.
>    powerpc/32: use memset() instead of memset_io() to zero BSS
>    powerpc/32: make KVIRT_TOP dependant on FIXMAP_START
>    powerpc/32: prepare shadow area for KASAN
>    powerpc: disable KASAN instrumentation on early/critical files.
>    powerpc/32: Add KASAN support
>    powerpc/32s: move hash code patching out of MMU_init_hw()
>    powerpc/32s: set up an early static hash table for KASAN.
> 
>   arch/powerpc/Kconfig                         |   6 +
>   arch/powerpc/include/asm/book3s/32/pgtable.h |   2 +-
>   arch/powerpc/include/asm/fixmap.h            |   5 +
>   arch/powerpc/include/asm/kasan.h             |  39 +++++
>   arch/powerpc/include/asm/nohash/32/pgtable.h |   2 +-
>   arch/powerpc/include/asm/string.h            |  32 +++-
>   arch/powerpc/kernel/Makefile                 |  14 +-
>   arch/powerpc/kernel/cputable.c               |  13 +-
>   arch/powerpc/kernel/early_32.c               |  36 +++++
>   arch/powerpc/kernel/head_32.S                |  46 ++++--
>   arch/powerpc/kernel/head_40x.S               |   3 +
>   arch/powerpc/kernel/head_44x.S               |   3 +
>   arch/powerpc/kernel/head_8xx.S               |   3 +
>   arch/powerpc/kernel/head_fsl_booke.S         |   3 +
>   arch/powerpc/kernel/prom_init.c              | 213 +++++++++++++++++++++------
>   arch/powerpc/kernel/prom_init_check.sh       |  12 +-
>   arch/powerpc/kernel/setup-common.c           |   3 +
>   arch/powerpc/kernel/setup_32.c               |  28 ----
>   arch/powerpc/lib/Makefile                    |  19 ++-
>   arch/powerpc/lib/copy_32.S                   |  15 +-
>   arch/powerpc/lib/mem_64.S                    |  10 +-
>   arch/powerpc/lib/memcpy_64.S                 |   4 +-
>   arch/powerpc/mm/Makefile                     |   7 +
>   arch/powerpc/mm/init_32.c                    |   1 +
>   arch/powerpc/mm/kasan/Makefile               |   5 +
>   arch/powerpc/mm/kasan/kasan_init_32.c        | 177 ++++++++++++++++++++++
>   arch/powerpc/mm/mem.c                        |   4 +
>   arch/powerpc/mm/mmu_decl.h                   |   2 +
>   arch/powerpc/mm/ppc_mmu_32.c                 |  34 +++--
>   arch/powerpc/mm/ptdump/ptdump.c              |   8 +
>   arch/powerpc/platforms/powermac/Makefile     |   6 +
>   arch/powerpc/purgatory/Makefile              |   3 +
>   arch/powerpc/xmon/Makefile                   |   1 +
>   33 files changed, 640 insertions(+), 119 deletions(-)
>   create mode 100644 arch/powerpc/include/asm/kasan.h
>   create mode 100644 arch/powerpc/kernel/early_32.c
>   create mode 100644 arch/powerpc/mm/kasan/Makefile
>   create mode 100644 arch/powerpc/mm/kasan/kasan_init_32.c
>