+ kasan-simplify-kasan_find_first_bad_addr-call-sites.patch added to -mm tree

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: kasan: simplify kasan_find_first_bad_addr call sites
has been added to the -mm tree.  Its filename is
     kasan-simplify-kasan_find_first_bad_addr-call-sites.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/kasan-simplify-kasan_find_first_bad_addr-call-sites.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/kasan-simplify-kasan_find_first_bad_addr-call-sites.patch

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 and is updated
there every 3-4 working days

------------------------------------------------------
From: Andrey Konovalov <andreyknvl@google.com>
Subject: kasan: simplify kasan_find_first_bad_addr call sites

Move the addr_has_metadata() check into kasan_find_first_bad_addr().

Link: https://lkml.kernel.org/r/a49576f7a23283d786ba61579cb0c5057e8f0b9b.1646237226.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Marco Elver <elver@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/kasan/report.c         |    5 +----
 mm/kasan/report_generic.c |    4 ++++
 mm/kasan/report_hw_tags.c |    1 +
 mm/kasan/report_sw_tags.c |    4 ++++
 4 files changed, 10 insertions(+), 4 deletions(-)

--- a/mm/kasan/report.c~kasan-simplify-kasan_find_first_bad_addr-call-sites
+++ a/mm/kasan/report.c
@@ -444,10 +444,7 @@ static void __kasan_report(void *addr, s
 	start_report(&flags, true);
 
 	info.access_addr = addr;
-	if (addr_has_metadata(addr))
-		info.first_bad_addr = kasan_find_first_bad_addr(addr, size);
-	else
-		info.first_bad_addr = addr;
+	info.first_bad_addr = kasan_find_first_bad_addr(addr, size);
 	info.access_size = size;
 	info.is_write = is_write;
 	info.ip = ip;
--- a/mm/kasan/report_generic.c~kasan-simplify-kasan_find_first_bad_addr-call-sites
+++ a/mm/kasan/report_generic.c
@@ -34,8 +34,12 @@ void *kasan_find_first_bad_addr(void *ad
 {
 	void *p = addr;
 
+	if (!addr_has_metadata(p))
+		return p;
+
 	while (p < addr + size && !(*(u8 *)kasan_mem_to_shadow(p)))
 		p += KASAN_GRANULE_SIZE;
+
 	return p;
 }
 
--- a/mm/kasan/report_hw_tags.c~kasan-simplify-kasan_find_first_bad_addr-call-sites
+++ a/mm/kasan/report_hw_tags.c
@@ -17,6 +17,7 @@
 
 void *kasan_find_first_bad_addr(void *addr, size_t size)
 {
+	/* Return the same value regardless of whether addr_has_metadata(). */
 	return kasan_reset_tag(addr);
 }
 
--- a/mm/kasan/report_sw_tags.c~kasan-simplify-kasan_find_first_bad_addr-call-sites
+++ a/mm/kasan/report_sw_tags.c
@@ -35,8 +35,12 @@ void *kasan_find_first_bad_addr(void *ad
 	void *p = kasan_reset_tag(addr);
 	void *end = p + size;
 
+	if (!addr_has_metadata(p))
+		return p;
+
 	while (p < end && tag == *(u8 *)kasan_mem_to_shadow(p))
 		p += KASAN_GRANULE_SIZE;
+
 	return p;
 }
 
_

Patches currently in -mm which might be from andreyknvl@google.com are

kasan-page_alloc-deduplicate-should_skip_kasan_poison.patch
kasan-page_alloc-move-tag_clear_highpage-out-of-kernel_init_free_pages.patch
kasan-page_alloc-merge-kasan_free_pages-into-free_pages_prepare.patch
kasan-page_alloc-simplify-kasan_poison_pages-call-site.patch
kasan-page_alloc-init-memory-of-skipped-pages-on-free.patch
kasan-drop-skip_kasan_poison-variable-in-free_pages_prepare.patch
mm-clarify-__gfp_zerotags-comment.patch
kasan-only-apply-__gfp_zerotags-when-memory-is-zeroed.patch
kasan-page_alloc-refactor-init-checks-in-post_alloc_hook.patch
kasan-page_alloc-merge-kasan_alloc_pages-into-post_alloc_hook.patch
kasan-page_alloc-combine-tag_clear_highpage-calls-in-post_alloc_hook.patch
kasan-page_alloc-move-setpageskipkasanpoison-in-post_alloc_hook.patch
kasan-page_alloc-move-kernel_init_free_pages-in-post_alloc_hook.patch
kasan-page_alloc-rework-kasan_unpoison_pages-call-site.patch
kasan-clean-up-metadata-byte-definitions.patch
kasan-define-kasan_vmalloc_invalid-for-sw_tags.patch
kasan-x86-arm64-s390-rename-functions-for-modules-shadow.patch
kasan-vmalloc-drop-outdated-vm_kasan-comment.patch
kasan-reorder-vmalloc-hooks.patch
kasan-add-wrappers-for-vmalloc-hooks.patch
kasan-vmalloc-reset-tags-in-vmalloc-functions.patch
kasan-fork-reset-pointer-tags-of-vmapped-stacks.patch
kasan-arm64-reset-pointer-tags-of-vmapped-stacks.patch
kasan-fork-reset-pointer-tags-of-vmapped-stacks-fix.patch
kasan-vmalloc-add-vmalloc-tagging-for-sw_tags.patch
kasan-vmalloc-arm64-mark-vmalloc-mappings-as-pgprot_tagged.patch
kasan-vmalloc-unpoison-vm_alloc-pages-after-mapping.patch
kasan-mm-only-define-___gfp_skip_kasan_poison-with-hw_tags.patch
kasan-page_alloc-allow-skipping-unpoisoning-for-hw_tags.patch
kasan-page_alloc-allow-skipping-memory-init-for-hw_tags.patch
kasan-vmalloc-add-vmalloc-tagging-for-hw_tags.patch
kasan-vmalloc-only-tag-normal-vmalloc-allocations.patch
kasan-arm64-dont-tag-executable-vmalloc-allocations.patch
kasan-mark-kasan_arg_stacktrace-as-__initdata.patch
kasan-clean-up-feature-flags-for-hw_tags-mode.patch
kasan-add-kasanvmalloc-command-line-flag.patch
kasan-allow-enabling-kasan_vmalloc-and-sw-hw_tags.patch
arm64-select-kasan_vmalloc-for-sw-hw_tags-modes.patch
kasan-documentation-updates.patch
kasan-improve-vmalloc-tests.patch
kasan-improve-vmalloc-tests-fix-2.patch
kasan-improve-vmalloc-tests-fix-3.patch
kasan-test-support-async-again-and-asymm-modes-for-hw_tags.patch
kasan-print-virtual-mapping-info-in-reports.patch
kasan-drop-addr-check-from-describe_object_addr.patch
kasan-more-line-breaks-in-reports.patch
kasan-rearrange-stack-frame-info-in-reports.patch
kasan-improve-stack-frame-info-in-reports.patch
kasan-print-basic-stack-frame-info-for-sw_tags.patch
kasan-simplify-async-check-in-end_report.patch
kasan-simplify-kasan_update_kunit_status-and-call-sites.patch
kasan-check-config_kasan_kunit_test-instead-of-config_kunit.patch
kasan-move-update_kunit_status-to-start_report.patch
kasan-move-disable_trace_on_warning-to-start_report.patch
kasan-split-out-print_report-from-__kasan_report.patch
kasan-simplify-kasan_find_first_bad_addr-call-sites.patch
kasan-restructure-kasan_report.patch
kasan-merge-__kasan_report-into-kasan_report.patch
kasan-call-print_report-from-kasan_report_invalid_free.patch
kasan-move-and-simplify-kasan_report_async.patch
kasan-rename-kasan_access_info-to-kasan_report_info.patch
kasan-add-comment-about-uaccess-regions-to-kasan_report.patch
kasan-respect-kasan_bit_reported-in-all-reporting-routines.patch
kasan-reorder-reporting-functions.patch
kasan-move-and-hide-kasan_save_enable-restore_multi_shot.patch
kasan-disable-lockdep-when-printing-reports.patch