From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 944D94685 for ; Thu, 20 Jun 2024 00:58:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718845109; cv=none; b=K3gOvEjpWhDtsmXvdo67mFIVZj/tOx5YVn8pn/fnf6oQolx0UwtEs1Z1mVs++7vwXYlvo+4OxtCDxaVNXjlJMQMw6yqJMBEmmSTofEy0MszzMDtNVsguIddGQAkiD3A9HEmg5Y6tqKgHQwFD694krMbJKetrT7072JseHR15InI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718845109; c=relaxed/simple; bh=T7/gOSN7KrfuH99gevkCt+xBzl+wHWvIc4UriV7wYwg=; h=Date:To:From:Subject:Message-Id; b=fYPKq0QD39iUdwLjXsK2Vs9AzrbmWFrnNte3M9zqxZA39w8+tW/HdPSAGrH6zU7tm2xif2iTNBlKEb8HuXYzsN2F67vUSdYwAXXvEIVGY44chT0rCIzka1ZAYZG+mjOCy0+oadKoScRy8bNS+MlKRabyerGS82DvND78I7gV3+4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=ENf0YHCr; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="ENf0YHCr" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 615A6C2BBFC; Thu, 20 Jun 2024 00:58:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1718845109; bh=T7/gOSN7KrfuH99gevkCt+xBzl+wHWvIc4UriV7wYwg=; h=Date:To:From:Subject:From; b=ENf0YHCrmPOucQHJEq4pI+2G8BKm6SN+HfZmKpndVxZ5vb9Ar748JkcgPK0qwT414 8k0U7j52LJ0AMMYQHvhRzopHgJe9AlAWStVSB1yGS/5PB8jV0xPNdIVDT0dVWC9Frm QiFc4eTGio/Soc7lPR1ebvcScjPYErwfghjSKVYE= Date: Wed, 19 Jun 2024 17:58:28 -0700 To: mm-commits@vger.kernel.org,vbabka@suse.cz,svens@linux.ibm.com,rostedt@goodmis.org,roman.gushchin@linux.dev,rientjes@google.com,penberg@kernel.org,mhiramat@kernel.org,mark.rutland@arm.com,kasan-dev@googlegroups.com,iamjoonsoo.kim@lge.com,hca@linux.ibm.com,gor@linux.ibm.com,glider@google.com,elver@google.com,dvyukov@google.com,cl@linux.com,borntraeger@linux.ibm.com,agordeev@linux.ibm.com,42.hyeyoo@gmail.com,iii@linux.ibm.com,akpm@linux-foundation.org From: Andrew Morton Subject: + kmsan-expose-kmsan_get_metadata.patch added to mm-unstable branch Message-Id: <20240620005829.615A6C2BBFC@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: kmsan: expose kmsan_get_metadata() has been added to the -mm mm-unstable branch. Its filename is kmsan-expose-kmsan_get_metadata.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/kmsan-expose-kmsan_get_metadata.patch This patch will later appear in the mm-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via the mm-everything branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there every 2-3 working days ------------------------------------------------------ From: Ilya Leoshkevich Subject: kmsan: expose kmsan_get_metadata() Date: Wed, 19 Jun 2024 17:43:44 +0200 Each s390 CPU has lowcore pages associated with it. Each CPU sees its own lowcore at virtual address 0 through a hardware mechanism called prefixing. Additionally, all lowcores are mapped to non-0 virtual addresses stored in the lowcore_ptr[] array. When lowcore is accessed through virtual address 0, one needs to resolve metadata for lowcore_ptr[raw_smp_processor_id()]. Expose kmsan_get_metadata() to make it possible to do this from the arch code. Link: https://lkml.kernel.org/r/20240619154530.163232-10-iii@linux.ibm.com Signed-off-by: Ilya Leoshkevich Reviewed-by: Alexander Potapenko Cc: Alexander Gordeev Cc: Christian Borntraeger Cc: Christoph Lameter Cc: David Rientjes Cc: Dmitry Vyukov Cc: Heiko Carstens Cc: Hyeonggon Yoo <42.hyeyoo@gmail.com> Cc: Joonsoo Kim Cc: Cc: Marco Elver Cc: Mark Rutland Cc: Masami Hiramatsu (Google) Cc: Pekka Enberg Cc: Roman Gushchin Cc: Steven Rostedt (Google) Cc: Sven Schnelle Cc: Vasily Gorbik Cc: Vlastimil Babka Signed-off-by: Andrew Morton --- include/linux/kmsan.h | 9 +++++++++ mm/kmsan/instrumentation.c | 1 + mm/kmsan/kmsan.h | 1 - 3 files changed, 10 insertions(+), 1 deletion(-) --- a/include/linux/kmsan.h~kmsan-expose-kmsan_get_metadata +++ a/include/linux/kmsan.h @@ -230,6 +230,15 @@ void kmsan_handle_urb(const struct urb * */ void kmsan_unpoison_entry_regs(const struct pt_regs *regs); +/** + * kmsan_get_metadata() - Return a pointer to KMSAN shadow or origins. + * @addr: kernel address. + * @is_origin: whether to return origins or shadow. + * + * Return NULL if metadata cannot be found. + */ +void *kmsan_get_metadata(void *addr, bool is_origin); + #else static inline void kmsan_init_shadow(void) --- a/mm/kmsan/instrumentation.c~kmsan-expose-kmsan_get_metadata +++ a/mm/kmsan/instrumentation.c @@ -14,6 +14,7 @@ #include "kmsan.h" #include +#include #include #include #include --- a/mm/kmsan/kmsan.h~kmsan-expose-kmsan_get_metadata +++ a/mm/kmsan/kmsan.h @@ -66,7 +66,6 @@ struct shadow_origin_ptr { struct shadow_origin_ptr kmsan_get_shadow_origin_ptr(void *addr, u64 size, bool store); -void *kmsan_get_metadata(void *addr, bool is_origin); void __init kmsan_init_alloc_meta_for_range(void *start, void *end); enum kmsan_bug_reason { _ Patches currently in -mm which might be from iii@linux.ibm.com are ftrace-unpoison-ftrace_regs-in-ftrace_ops_list_func.patch kmsan-make-the-tests-compatible-with-kmsanpanic=1.patch kmsan-disable-kmsan-when-deferred_struct_page_init-is-enabled.patch kmsan-increase-the-maximum-store-size-to-4096.patch kmsan-fix-is_bad_asm_addr-on-arches-with-overlapping-address-spaces.patch kmsan-fix-kmsan_copy_to_user-on-arches-with-overlapping-address-spaces.patch kmsan-remove-a-useless-assignment-from-kmsan_vmap_pages_range_noflush.patch kmsan-remove-an-x86-specific-include-from-kmsanh.patch kmsan-expose-kmsan_get_metadata.patch kmsan-export-panic_on_kmsan.patch kmsan-allow-disabling-kmsan-checks-for-the-current-task.patch kmsan-introduce-memset_no_sanitize_memory.patch kmsan-support-slab_poison.patch kmsan-use-align_down-in-kmsan_get_metadata.patch kmsan-do-not-round-up-pg_data_t-size.patch mm-slub-let-kmsan-access-metadata.patch mm-slub-disable-kmsan-when-checking-the-padding-bytes.patch mm-kfence-disable-kmsan-when-checking-the-canary.patch lib-zlib-unpoison-dfltcc-output-buffers.patch kmsan-accept-ranges-starting-with-0-on-s390.patch s390-boot-turn-off-kmsan.patch s390-use-a-larger-stack-for-kmsan.patch s390-boot-add-the-kmsan-runtime-stub.patch s390-checksum-add-a-kmsan-check.patch s390-cpacf-unpoison-the-results-of-cpacf_trng.patch s390-cpumf-unpoison-stcctm-output-buffer.patch s390-diag-unpoison-diag224-output-buffer.patch s390-ftrace-unpoison-ftrace_regs-in-kprobe_ftrace_handler.patch s390-irqflags-do-not-instrument-arch_local_irq_-with-kmsan.patch s390-mm-define-kmsan-metadata-for-vmalloc-and-modules.patch s390-string-add-kmsan-support.patch s390-traps-unpoison-the-kernel_stack_overflows-pt_regs.patch s390-uaccess-add-kmsan-support-to-put_user-and-get_user.patch s390-uaccess-add-the-missing-linux-instrumentedh-include.patch s390-unwind-disable-kmsan-checks.patch s390-kmsan-implement-the-architecture-specific-functions.patch kmsan-enable-on-s390.patch