The patch titled
Subject: kasan: simplify kasan_find_first_bad_addr call sites
has been removed from the -mm tree. Its filename was
kasan-simplify-kasan_find_first_bad_addr-call-sites.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
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@xxxxxxxxxx
Signed-off-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Cc: Alexander Potapenko <glider@xxxxxxxxxx>
Cc: Andrey Ryabinin <ryabinin.a.a@xxxxxxxxx>
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: Marco Elver <elver@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
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
@@ -36,8 +36,12 @@ 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@xxxxxxxxxx are
stacktrace-add-interface-based-on-shadow-call-stack.patch
arm64-scs-save-scs_sp-values-per-cpu-when-switching-stacks.patch
arm64-implement-stack_trace_save_shadow.patch
kasan-use-stack_trace_save_shadow.patch
