The patch titled
Subject: kasan, arm64: only use kasan_depth for software modes
has been added to the -mm tree. Its filename is
kasan-arm64-only-use-kasan_depth-for-software-modes.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/kasan-arm64-only-use-kasan_depth-for-software-modes.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/kasan-arm64-only-use-kasan_depth-for-software-modes.patch
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------------------------------------------------------
From: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Subject: kasan, arm64: only use kasan_depth for software modes
This is a preparatory commit for the upcoming addition of a new hardware
tag-based (MTE-based) KASAN mode.
Hardware tag-based KASAN won't use kasan_depth. Only define and use it
when one of the software KASAN modes are enabled.
No functional changes for software modes.
Link: https://lkml.kernel.org/r/91b3defa17748a61d1432929a80890043ca8dcda.1605046192.git.andreyknvl@xxxxxxxxxx
Signed-off-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@xxxxxxx>
Reviewed-by: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Alexander Potapenko <glider@xxxxxxxxxx>
Cc: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
Cc: Branislav Rankov <Branislav.Rankov@xxxxxxx>
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: Evgenii Stepanov <eugenis@xxxxxxxxxx>
Cc: Kevin Brodsky <kevin.brodsky@xxxxxxx>
Cc: Marco Elver <elver@xxxxxxxxxx>
Cc: Vasily Gorbik <gor@xxxxxxxxxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/arm64/mm/kasan_init.c | 11 ++++++++---
include/linux/kasan.h | 18 +++++++++---------
include/linux/sched.h | 2 +-
init/init_task.c | 2 +-
mm/kasan/common.c | 2 ++
mm/kasan/report.c | 2 ++
6 files changed, 23 insertions(+), 14 deletions(-)
--- a/arch/arm64/mm/kasan_init.c~kasan-arm64-only-use-kasan_depth-for-software-modes
+++ a/arch/arm64/mm/kasan_init.c
@@ -273,17 +273,22 @@ static void __init kasan_init_shadow(voi
cpu_replace_ttbr1(lm_alias(swapper_pg_dir));
}
+static void __init kasan_init_depth(void)
+{
+ init_task.kasan_depth = 0;
+}
+
#else /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS) */
static inline void __init kasan_init_shadow(void) { }
+static inline void __init kasan_init_depth(void) { }
+
#endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
void __init kasan_init(void)
{
kasan_init_shadow();
-
- /* At this point kasan is fully initialized. Enable error messages */
- init_task.kasan_depth = 0;
+ kasan_init_depth();
pr_info("KernelAddressSanitizer initialized\n");
}
--- a/include/linux/kasan.h~kasan-arm64-only-use-kasan_depth-for-software-modes
+++ a/include/linux/kasan.h
@@ -51,6 +51,12 @@ static inline void *kasan_mem_to_shadow(
int kasan_add_zero_shadow(void *start, unsigned long size);
void kasan_remove_zero_shadow(void *start, unsigned long size);
+/* Enable reporting bugs after kasan_disable_current() */
+extern void kasan_enable_current(void);
+
+/* Disable reporting bugs for current task */
+extern void kasan_disable_current(void);
+
#else /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
static inline int kasan_add_zero_shadow(void *start, unsigned long size)
@@ -61,16 +67,13 @@ static inline void kasan_remove_zero_sha
unsigned long size)
{}
+static inline void kasan_enable_current(void) {}
+static inline void kasan_disable_current(void) {}
+
#endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
#ifdef CONFIG_KASAN
-/* Enable reporting bugs after kasan_disable_current() */
-extern void kasan_enable_current(void);
-
-/* Disable reporting bugs for current task */
-extern void kasan_disable_current(void);
-
void kasan_unpoison_memory(const void *address, size_t size);
void kasan_unpoison_task_stack(struct task_struct *task);
@@ -121,9 +124,6 @@ static inline void kasan_unpoison_memory
static inline void kasan_unpoison_task_stack(struct task_struct *task) {}
-static inline void kasan_enable_current(void) {}
-static inline void kasan_disable_current(void) {}
-
static inline void kasan_alloc_pages(struct page *page, unsigned int order) {}
static inline void kasan_free_pages(struct page *page, unsigned int order) {}
--- a/include/linux/sched.h~kasan-arm64-only-use-kasan_depth-for-software-modes
+++ a/include/linux/sched.h
@@ -1198,7 +1198,7 @@ struct task_struct {
u64 timer_slack_ns;
u64 default_timer_slack_ns;
-#ifdef CONFIG_KASAN
+#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
unsigned int kasan_depth;
#endif
--- a/init/init_task.c~kasan-arm64-only-use-kasan_depth-for-software-modes
+++ a/init/init_task.c
@@ -176,7 +176,7 @@ struct task_struct init_task
.numa_group = NULL,
.numa_faults = NULL,
#endif
-#ifdef CONFIG_KASAN
+#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
.kasan_depth = 1,
#endif
#ifdef CONFIG_KCSAN
--- a/mm/kasan/common.c~kasan-arm64-only-use-kasan_depth-for-software-modes
+++ a/mm/kasan/common.c
@@ -47,6 +47,7 @@ void kasan_set_track(struct kasan_track
track->stack = kasan_save_stack(flags);
}
+#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
void kasan_enable_current(void)
{
current->kasan_depth++;
@@ -56,6 +57,7 @@ void kasan_disable_current(void)
{
current->kasan_depth--;
}
+#endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
static void __kasan_unpoison_stack(struct task_struct *task, const void *sp)
{
--- a/mm/kasan/report.c~kasan-arm64-only-use-kasan_depth-for-software-modes
+++ a/mm/kasan/report.c
@@ -292,8 +292,10 @@ static void print_shadow_for_address(con
static bool report_enabled(void)
{
+#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
if (current->kasan_depth)
return false;
+#endif
if (test_bit(KASAN_BIT_MULTI_SHOT, &kasan_flags))
return true;
return !test_and_set_bit(KASAN_BIT_REPORTED, &kasan_flags);
_
Patches currently in -mm which might be from andreyknvl@xxxxxxxxxx are
kasan-drop-unnecessary-gpl-text-from-comment-headers.patch
kasan-kasan_vmalloc-depends-on-kasan_generic.patch
kasan-group-vmalloc-code.patch
s390-kasan-include-asm-pageh-from-asm-kasanh.patch
kasan-shadow-declarations-only-for-software-modes.patch
kasan-rename-unpoison_shadow-to-unpoison_memory.patch
kasan-rename-kasan_shadow_-to-kasan_granule_.patch
kasan-only-build-initc-for-software-modes.patch
kasan-split-out-shadowc-from-commonc.patch
kasan-define-kasan_granule_page.patch
kasan-rename-report-and-tags-files.patch
kasan-dont-duplicate-config-dependencies.patch
kasan-hide-invalid-free-check-implementation.patch
kasan-decode-stack-frame-only-with-kasan_stack_enable.patch
kasan-arm64-only-init-shadow-for-software-modes.patch
kasan-arm64-only-use-kasan_depth-for-software-modes.patch
kasan-arm64-move-initialization-message.patch
kasan-arm64-rename-kasan_init_tags-and-mark-as-__init.patch
kasan-rename-addr_has_shadow-to-addr_has_metadata.patch
kasan-rename-print_shadow_for_address-to-print_memory_metadata.patch
kasan-kasan_non_canonical_hook-only-for-software-modes.patch
kasan-rename-shadow-layout-macros-to-meta.patch
kasan-separate-metadata_fetch_row-for-each-mode.patch
kasan-arm64-dont-allow-sw_tags-with-arm64_mte.patch
kasan-introduce-config_kasan_hw_tags.patch
arm64-kasan-align-allocations-for-hw_tags.patch
arm64-kasan-add-arch-layer-for-memory-tagging-helpers.patch
kasan-define-kasan_granule_size-for-hw_tags.patch
kasan-x86-s390-update-undef-config_kasan.patch
kasan-arm64-expand-config_kasan-checks.patch
kasan-arm64-implement-hw_tags-runtime.patch
kasan-arm64-print-report-from-tag-fault-handler.patch
kasan-mm-reset-tags-when-accessing-metadata.patch
kasan-arm64-enable-config_kasan_hw_tags.patch
kasan-add-documentation-for-hardware-tag-based-mode.patch
