From: Vincenzo Frascino <vincenzo.frascino@arm.com>
To: linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>, Dmitry Vyukov <dvyukov@google.com>,
Andrey Ryabinin <aryabinin@virtuozzo.com>,
Alexander Potapenko <glider@google.com>,
Marco Elver <elver@google.com>,
Evgenii Stepanov <eugenis@google.com>,
Branislav Rankov <Branislav.Rankov@arm.com>,
Andrey Konovalov <andreyknvl@google.com>
Subject: [PATCH v4 3/5] kasan: Add report for async mode
Date: Mon, 18 Jan 2021 18:30:31 +0000 [thread overview]
Message-ID: <20210118183033.41764-4-vincenzo.frascino@arm.com> (raw)
In-Reply-To: <20210118183033.41764-1-vincenzo.frascino@arm.com>
KASAN provides an asynchronous mode of execution.
Add reporting functionality for this mode.
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
---
include/linux/kasan.h | 3 +++
mm/kasan/report.c | 16 ++++++++++++++--
2 files changed, 17 insertions(+), 2 deletions(-)
diff --git a/include/linux/kasan.h b/include/linux/kasan.h
index fe1ae73ff8b5..8f43836ccdac 100644
--- a/include/linux/kasan.h
+++ b/include/linux/kasan.h
@@ -336,6 +336,9 @@ static inline void *kasan_reset_tag(const void *addr)
bool kasan_report(unsigned long addr, size_t size,
bool is_write, unsigned long ip);
+bool kasan_report_async(unsigned long addr, size_t size,
+ bool is_write, unsigned long ip);
+
#else /* CONFIG_KASAN_SW_TAGS || CONFIG_KASAN_HW_TAGS */
static inline void *kasan_reset_tag(const void *addr)
diff --git a/mm/kasan/report.c b/mm/kasan/report.c
index c0fb21797550..946016ead6a9 100644
--- a/mm/kasan/report.c
+++ b/mm/kasan/report.c
@@ -388,11 +388,11 @@ static void __kasan_report(unsigned long addr, size_t size, bool is_write,
start_report(&flags);
print_error_description(&info);
- if (addr_has_metadata(untagged_addr))
+ if (addr_has_metadata(untagged_addr) && (untagged_addr != 0))
print_tags(get_tag(tagged_addr), info.first_bad_addr);
pr_err("\n");
- if (addr_has_metadata(untagged_addr)) {
+ if (addr_has_metadata(untagged_addr) && (untagged_addr != 0)) {
print_address_description(untagged_addr, get_tag(tagged_addr));
pr_err("\n");
print_memory_metadata(info.first_bad_addr);
@@ -419,6 +419,18 @@ bool kasan_report(unsigned long addr, size_t size, bool is_write,
return ret;
}
+bool kasan_report_async(unsigned long addr, size_t size,
+ bool is_write, unsigned long ip)
+{
+ pr_info("==================================================================\n");
+ pr_info("KASAN: set in asynchronous mode\n");
+ pr_info("KASAN: some information might not be accurate\n");
+ pr_info("KASAN: fault address is ignored\n");
+ pr_info("KASAN: write/read distinction is ignored\n");
+
+ return kasan_report(addr, size, is_write, ip);
+}
+
#ifdef CONFIG_KASAN_INLINE
/*
* With CONFIG_KASAN_INLINE, accesses to bogus pointers (outside the high
--
2.30.0
next prev parent reply other threads:[~2021-01-18 18:33 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-18 18:30 [PATCH v4 0/5] arm64: ARMv8.5-A: MTE: Add async mode support Vincenzo Frascino
2021-01-18 18:30 ` [PATCH v4 1/5] arm64: mte: Add asynchronous " Vincenzo Frascino
2021-01-19 12:57 ` Catalin Marinas
2021-01-19 18:10 ` Andrey Konovalov
2021-01-18 18:30 ` [PATCH v4 2/5] kasan: Add KASAN mode kernel parameter Vincenzo Frascino
2021-01-19 18:10 ` Andrey Konovalov
2021-01-20 14:45 ` Vincenzo Frascino
2021-01-21 16:45 ` Vincenzo Frascino
2021-01-18 18:30 ` Vincenzo Frascino [this message]
2021-01-19 13:04 ` [PATCH v4 3/5] kasan: Add report for async mode Catalin Marinas
2021-01-19 14:23 ` Vincenzo Frascino
2021-01-19 14:46 ` Mark Rutland
2021-01-19 15:05 ` Vincenzo Frascino
2021-01-19 18:12 ` Andrey Konovalov
2021-01-20 14:46 ` Vincenzo Frascino
2021-01-18 18:30 ` [PATCH v4 4/5] arm64: mte: Enable async tag check fault Vincenzo Frascino
2021-01-19 14:34 ` Catalin Marinas
2021-01-19 14:45 ` Vincenzo Frascino
2021-01-18 18:30 ` [PATCH v4 5/5] arm64: mte: Inline mte_assign_mem_tag_range() Vincenzo Frascino
2021-01-19 14:45 ` Catalin Marinas
2021-01-19 15:48 ` Vincenzo Frascino
2021-01-19 18:12 ` Andrey Konovalov
2021-01-19 19:00 ` Catalin Marinas
2021-01-19 19:34 ` Andrey Konovalov
2021-01-19 18:09 ` [PATCH v4 0/5] arm64: ARMv8.5-A: MTE: Add async mode support Andrey Konovalov
2021-01-21 11:35 ` Vincenzo Frascino
2021-01-21 12:25 ` Andrey Konovalov
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