This is a note to let you know that I've just added the patch titled
mm/kasan: add API to check memory regions
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mm-kasan-add-api-to-check-memory-regions.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Thu Oct 22 03:56:50 PM CEST 2020
From: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
Date: Fri, 20 May 2016 16:59:28 -0700
Subject: mm/kasan: add API to check memory regions
From: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
commit 64f8ebaf115bcddc4aaa902f981c57ba6506bc42 upstream.
Memory access coded in an assembly won't be seen by KASAN as a compiler
can instrument only C code. Add kasan_check_[read,write]() API which is
going to be used to check a certain memory range.
Link: http://lkml.kernel.org/r/1462538722-1574-3-git-send-email-aryabinin@xxxxxxxxxxxxx
Signed-off-by: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
Acked-by: Alexander Potapenko <glider@xxxxxxxxxx>
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
[bwh: Backported to 4.4: drop change in MAINTAINERS]
Signed-off-by: Ben Hutchings <ben.hutchings@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
include/linux/kasan-checks.h | 12 ++++++++++++
mm/kasan/kasan.c | 12 ++++++++++++
2 files changed, 24 insertions(+)
create mode 100644 include/linux/kasan-checks.h
--- /dev/null
+++ b/include/linux/kasan-checks.h
@@ -0,0 +1,12 @@
+#ifndef _LINUX_KASAN_CHECKS_H
+#define _LINUX_KASAN_CHECKS_H
+
+#ifdef CONFIG_KASAN
+void kasan_check_read(const void *p, unsigned int size);
+void kasan_check_write(const void *p, unsigned int size);
+#else
+static inline void kasan_check_read(const void *p, unsigned int size) { }
+static inline void kasan_check_write(const void *p, unsigned int size) { }
+#endif
+
+#endif
--- a/mm/kasan/kasan.c
+++ b/mm/kasan/kasan.c
@@ -278,6 +278,18 @@ static void check_memory_region(unsigned
check_memory_region_inline(addr, size, write, ret_ip);
}
+void kasan_check_read(const void *p, unsigned int size)
+{
+ check_memory_region((unsigned long)p, size, false, _RET_IP_);
+}
+EXPORT_SYMBOL(kasan_check_read);
+
+void kasan_check_write(const void *p, unsigned int size)
+{
+ check_memory_region((unsigned long)p, size, true, _RET_IP_);
+}
+EXPORT_SYMBOL(kasan_check_write);
+
#undef memset
void *memset(void *addr, int c, size_t len)
{
Patches currently in stable-queue which might be from aryabinin@xxxxxxxxxxxxx are
queue-4.4/x86-mm-ptdump-fix-soft-lockup-in-page-table-walker.patch
queue-4.4/mm-kasan-add-api-to-check-memory-regions.patch
queue-4.4/compiler.h-add-read_word_at_a_time-function.patch
queue-4.4/compiler.h-kasan-avoid-duplicating-__read_once_size_nocheck.patch
queue-4.4/mm-kasan-print-name-of-mem-caller-in-report.patch
queue-4.4/lib-strscpy-shut-up-kasan-false-positives-in-strscpy.patch
