linux-kernel - [PATCH 00/13] kmsan: Enable on powerpc

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Message-Id: <20231214055539.9420-1-nicholas@linux.ibm.com>
Date:   Thu, 14 Dec 2023 05:55:26 +0000
From:   Nicholas Miehlbradt <nicholas@...ux.ibm.com>
To:     glider@...gle.com, elver@...gle.com, dvyukov@...gle.com,
        akpm@...ux-foundation.org, mpe@...erman.id.au, npiggin@...il.com,
        christophe.leroy@...roup.eu
Cc:     linux-mm@...ck.org, kasan-dev@...glegroups.com, iii@...ux.ibm.com,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        Nicholas Miehlbradt <nicholas@...ux.ibm.com>
Subject: [PATCH 00/13] kmsan: Enable on powerpc

This series provides the minimal support for Kernal Memory Sanitizer on 
powerpc pseries le guests. Kernal Memory Sanitizer is a tool which detects
uses of uninitialized memory. Currently KMSAN is clang only.

The clang support for powerpc has not yet been merged, the pull request can
be found here [1].

In addition to this series, there are a number of changes required in
generic kmsan code. These changes are already on mailing lists as part of
the series implementing KMSAN for s390 [2]. This series is intended to be
rebased on top of the s390 series.

In addition, I found a bug in the rtc driver used on powerpc. I have sent
a fix to this in a seperate series [3].

With this series and the two series mentioned above, I can successfully
boot pseries le defconfig without KMSAN warnings. I have not tested other
powerpc platforms.

[1] https://github.com/llvm/llvm-project/pull/73611
[2] https://lore.kernel.org/linux-mm/20231121220155.1217090-1-iii@linux.ibm.com/
[3] https://lore.kernel.org/linux-rtc/20231129073647.2624497-1-nicholas@linux.ibm.com/

Nicholas Miehlbradt (13):
  kmsan: Export kmsan_handle_dma
  hvc: Fix use of uninitialized array in udbg_hvc_putc
  powerpc: Disable KMSAN santitization for prom_init, vdso and purgatory
  powerpc: Disable CONFIG_DCACHE_WORD_ACCESS when KMSAN is enabled
  powerpc: Unpoison buffers populated by hcalls
  powerpc/pseries/nvram: Unpoison buffer populated by rtas_call
  powerpc/kprobes: Unpoison instruction in kprobe struct
  powerpc: Unpoison pt_regs
  powerpc: Disable KMSAN checks on functions which walk the stack
  powerpc: Define KMSAN metadata address ranges for vmalloc and ioremap
  powerpc: Implement architecture specific KMSAN interface
  powerpc/string: Add KMSAN support
  powerpc: Enable KMSAN on powerpc

 arch/powerpc/Kconfig                          |  3 +-
 arch/powerpc/include/asm/book3s/64/pgtable.h  | 42 +++++++++++++++
 arch/powerpc/include/asm/interrupt.h          |  2 +
 arch/powerpc/include/asm/kmsan.h              | 51 +++++++++++++++++++
 arch/powerpc/include/asm/string.h             | 18 ++++++-
 arch/powerpc/kernel/Makefile                  |  2 +
 arch/powerpc/kernel/irq_64.c                  |  2 +
 arch/powerpc/kernel/kprobes.c                 |  2 +
 arch/powerpc/kernel/module.c                  |  2 +-
 arch/powerpc/kernel/process.c                 |  6 +--
 arch/powerpc/kernel/stacktrace.c              | 10 ++--
 arch/powerpc/kernel/vdso/Makefile             |  1 +
 arch/powerpc/lib/Makefile                     |  2 +
 arch/powerpc/lib/mem_64.S                     |  5 +-
 arch/powerpc/lib/memcpy_64.S                  |  2 +
 arch/powerpc/perf/callchain.c                 |  2 +-
 arch/powerpc/platforms/pseries/hvconsole.c    |  2 +
 arch/powerpc/platforms/pseries/nvram.c        |  4 ++
 arch/powerpc/purgatory/Makefile               |  1 +
 arch/powerpc/sysdev/xive/spapr.c              |  3 ++
 drivers/tty/hvc/hvc_vio.c                     |  2 +-
 mm/kmsan/hooks.c                              |  1 +
 .../selftests/powerpc/copyloops/asm/kmsan.h   |  0
 .../powerpc/copyloops/linux/export.h          |  1 +
 24 files changed, 152 insertions(+), 14 deletions(-)
 create mode 100644 arch/powerpc/include/asm/kmsan.h
 create mode 100644 tools/testing/selftests/powerpc/copyloops/asm/kmsan.h

-- 
2.40.1