v3: https://lore.kernel.org/lkml/20231213233605.661251-1-iii@xxxxxxxxxxxxx/ v3 -> v4: Rebase. Elaborate why ftrace_ops_list_func() change is needed on x64_64 (Steven). Add a comment to the DFLTCC patch (Alexander P.). Simplify diag224(); Improve __arch_local_irq_attributes style; Use IS_ENABLED(CONFIG_KMSAN) for vmalloc area (Heiko). Align vmalloc area on _SEGMENT_SIZE (Alexander G.). v2: https://lore.kernel.org/lkml/20231121220155.1217090-1-iii@xxxxxxxxxxxxx/ v2 -> v3: Drop kmsan_memmove_metadata() and strlcpy() patches; Remove kmsan_get_metadata() stub; Move kmsan_enable_current() and kmsan_disable_current() to include/linux/kmsan.h, explain why a counter is needed; Drop the memset_no_sanitize_memory() patch; Use __memset() in the SLAB_POISON patch; Add kmsan-checks.h to the DFLTCC patch; Add recursion check to the arch_kmsan_get_meta_or_null() patch (Alexander P.). Fix inline + __no_kmsan_checks issues. New patch for s390/irqflags, that resolves a lockdep warning. New patch for s390/diag, that resolves a false positive when running on an LPAR. New patch for STCCTM, same as above. New patch for check_bytes_and_report() that resolves a false positive that occurs even on Intel. 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 (35): 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: Expose kmsan_get_metadata() kmsan: Export panic_on_kmsan kmsan: Allow disabling KMSAN checks for the current task kmsan: Support SLAB_POISON kmsan: Use ALIGN_DOWN() in kmsan_get_metadata() kmsan: Do not round up pg_data_t size mm: slub: Let KMSAN access metadata mm: slub: Unpoison the memchr_inv() return value mm: kfence: Disable KMSAN when checking the canary lib/zlib: Unpoison DFLTCC output buffers kmsan: Accept ranges starting with 0 on s390 s390/boot: Turn off KMSAN 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/cpumf: Unpoison STCCTM output buffer s390/diag: Unpoison diag224() output buffer s390/ftrace: Unpoison ftrace_regs in kprobe_ftrace_handler() s390/irqflags: Do not instrument arch_local_irq_*() with KMSAN 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 | 7 ++ arch/s390/boot/string.c | 16 ++++ arch/s390/include/asm/checksum.h | 2 + arch/s390/include/asm/cpacf.h | 3 + arch/s390/include/asm/cpu_mf.h | 6 ++ arch/s390/include/asm/irqflags.h | 17 ++++- arch/s390/include/asm/kmsan.h | 43 +++++++++++ arch/s390/include/asm/pgtable.h | 8 ++ arch/s390/include/asm/string.h | 20 +++-- arch/s390/include/asm/thread_info.h | 2 +- arch/s390/include/asm/uaccess.h | 111 ++++++++++++++++++++-------- arch/s390/kernel/diag.c | 10 ++- arch/s390/kernel/ftrace.c | 2 + arch/s390/kernel/traps.c | 6 ++ arch/s390/kernel/unwind_bc.c | 4 + drivers/s390/char/sclp.c | 2 +- include/linux/kmsan.h | 33 +++++++++ include/linux/kmsan_types.h | 2 +- kernel/trace/ftrace.c | 1 + lib/zlib_dfltcc/dfltcc.h | 1 + lib/zlib_dfltcc/dfltcc_util.h | 28 +++++++ mm/Kconfig | 1 + mm/kfence/core.c | 11 ++- mm/kmsan/core.c | 1 - mm/kmsan/hooks.c | 23 ++++-- mm/kmsan/init.c | 7 +- mm/kmsan/instrumentation.c | 11 +-- mm/kmsan/kmsan.h | 9 +-- mm/kmsan/kmsan_test.c | 5 ++ mm/kmsan/report.c | 8 +- mm/kmsan/shadow.c | 9 +-- mm/slub.c | 17 ++++- tools/objtool/check.c | 2 + 38 files changed, 361 insertions(+), 83 deletions(-) create mode 100644 arch/s390/boot/kmsan.c create mode 100644 arch/s390/include/asm/kmsan.h -- 2.45.1
