v1: https://lore.kernel.org/lkml/20231115203401.2495875-1-iii@xxxxxxxxxxxxx/ v1 -> v2: Add comments, sort #includes, introduce memset_no_sanitize_memory() and use it to avoid unpoisoning of redzones, change vmalloc alignment to _REGION3_SIZE, add R-bs (Alexander P.). Fix building [PATCH 28/33] s390/string: Add KMSAN support with FORTIFY_SOURCE. Reported-by: kernel test robot <lkp@xxxxxxxxx> Closes: https://lore.kernel.org/oe-kbuild-all/202311170550.bSBo44ix-lkp@xxxxxxxxx/ Hi, This series provides the minimal support for Kernel Memory Sanitizer on s390. Kernel Memory Sanitizer is clang-only instrumentation for finding accesses to uninitialized memory. The clang support for s390 has already been merged [1]. With this series, I can successfully boot s390 defconfig and debug_defconfig with kmsan.panic=1. The tool found one real s390-specific bug (fixed in master). Best regards, Ilya [1] https://reviews.llvm.org/D148596 Ilya Leoshkevich (33): ftrace: Unpoison ftrace_regs in ftrace_ops_list_func() kmsan: Make the tests compatible with kmsan.panic=1 kmsan: Disable KMSAN when DEFERRED_STRUCT_PAGE_INIT is enabled kmsan: Increase the maximum store size to 4096 kmsan: Fix is_bad_asm_addr() on arches with overlapping address spaces kmsan: Fix kmsan_copy_to_user() on arches with overlapping address spaces kmsan: Remove a useless assignment from kmsan_vmap_pages_range_noflush() kmsan: Remove an x86-specific #include from kmsan.h kmsan: Introduce kmsan_memmove_metadata() kmsan: Expose kmsan_get_metadata() kmsan: Export panic_on_kmsan kmsan: Allow disabling KMSAN checks for the current task kmsan: Introduce memset_no_sanitize_memory() kmsan: Support SLAB_POISON kmsan: Use ALIGN_DOWN() in kmsan_get_metadata() mm: slub: Let KMSAN access metadata mm: kfence: Disable KMSAN when checking the canary lib/string: Add KMSAN support to strlcpy() and strlcat() lib/zlib: Unpoison DFLTCC output buffers kmsan: Accept ranges starting with 0 on s390 s390: Turn off KMSAN for boot, vdso and purgatory s390: Use a larger stack for KMSAN s390/boot: Add the KMSAN runtime stub s390/checksum: Add a KMSAN check s390/cpacf: Unpoison the results of cpacf_trng() s390/ftrace: Unpoison ftrace_regs in kprobe_ftrace_handler() s390/mm: Define KMSAN metadata for vmalloc and modules s390/string: Add KMSAN support s390/traps: Unpoison the kernel_stack_overflow()'s pt_regs s390/uaccess: Add KMSAN support to put_user() and get_user() s390/unwind: Disable KMSAN checks s390: Implement the architecture-specific kmsan functions kmsan: Enable on s390 Documentation/dev-tools/kmsan.rst | 4 +- arch/s390/Kconfig | 1 + arch/s390/Makefile | 2 +- arch/s390/boot/Makefile | 3 + arch/s390/boot/kmsan.c | 6 ++ arch/s390/boot/startup.c | 8 ++ arch/s390/boot/string.c | 16 ++++ arch/s390/include/asm/checksum.h | 2 + arch/s390/include/asm/cpacf.h | 2 + arch/s390/include/asm/kmsan.h | 36 +++++++++ arch/s390/include/asm/pgtable.h | 10 +++ arch/s390/include/asm/string.h | 20 +++-- arch/s390/include/asm/thread_info.h | 2 +- arch/s390/include/asm/uaccess.h | 110 ++++++++++++++++++++-------- arch/s390/kernel/ftrace.c | 1 + arch/s390/kernel/traps.c | 6 ++ arch/s390/kernel/unwind_bc.c | 4 + arch/s390/kernel/vdso32/Makefile | 3 +- arch/s390/kernel/vdso64/Makefile | 3 +- arch/s390/purgatory/Makefile | 2 + include/linux/kmsan-checks.h | 26 +++++++ include/linux/kmsan.h | 23 ++++++ include/linux/kmsan_types.h | 2 +- kernel/trace/ftrace.c | 1 + lib/string.c | 6 ++ lib/zlib_dfltcc/dfltcc.h | 1 + lib/zlib_dfltcc/dfltcc_util.h | 23 ++++++ mm/Kconfig | 1 + mm/kfence/core.c | 5 +- mm/kmsan/core.c | 2 +- mm/kmsan/hooks.c | 30 +++++++- mm/kmsan/init.c | 5 +- mm/kmsan/instrumentation.c | 11 +-- mm/kmsan/kmsan.h | 9 +-- mm/kmsan/kmsan_test.c | 5 ++ mm/kmsan/report.c | 7 +- mm/kmsan/shadow.c | 9 +-- mm/slub.c | 12 ++- 38 files changed, 345 insertions(+), 74 deletions(-) create mode 100644 arch/s390/boot/kmsan.c create mode 100644 arch/s390/include/asm/kmsan.h -- 2.41.0
