[merged] kasan-support-alloca-poisoning.patch removed from -mm tree

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



The patch titled
     Subject: kasan: support alloca() poisoning
has been removed from the -mm tree.  Its filename was
     kasan-support-alloca-poisoning.patch

This patch was dropped because it was merged into mainline or a subsystem tree

------------------------------------------------------
From: Paul Lawrence <paullawrence@xxxxxxxxxx>
Subject: kasan: support alloca() poisoning

clang's AddressSanitizer implementation adds redzones on either side of
alloca()ed buffers.  These redzones are 32-byte aligned and at least 32
bytes long.

__asan_alloca_poison() is passed the size and address of the allocated
buffer, *excluding* the redzones on either side.  The left redzone will
always be to the immediate left of this buffer; but AddressSanitizer may
need to add padding between the end of the buffer and the right redzone. 
If there are any 8-byte chunks inside this padding, we should poison those
too.

__asan_allocas_unpoison() is just passed the top and bottom of the dynamic
stack area, so unpoisoning is simpler.

Link: http://lkml.kernel.org/r/20171204191735.132544-4-paullawrence@xxxxxxxxxx
Signed-off-by: Greg Hackmann <ghackmann@xxxxxxxxxx>
Signed-off-by: Paul Lawrence <paullawrence@xxxxxxxxxx>
Acked-by: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
Cc: Alexander Potapenko <glider@xxxxxxxxxx>
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>
Cc: Matthias Kaehlcke <mka@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 mm/kasan/kasan.c       |   34 ++++++++++++++++++++++++++++++++++
 mm/kasan/kasan.h       |    8 ++++++++
 mm/kasan/report.c      |    4 ++++
 scripts/Makefile.kasan |    3 ++-
 4 files changed, 48 insertions(+), 1 deletion(-)

diff -puN mm/kasan/kasan.c~kasan-support-alloca-poisoning mm/kasan/kasan.c
--- a/mm/kasan/kasan.c~kasan-support-alloca-poisoning
+++ a/mm/kasan/kasan.c
@@ -736,6 +736,40 @@ void __asan_unpoison_stack_memory(const
 }
 EXPORT_SYMBOL(__asan_unpoison_stack_memory);
 
+/* Emitted by compiler to poison alloca()ed objects. */
+void __asan_alloca_poison(unsigned long addr, size_t size)
+{
+	size_t rounded_up_size = round_up(size, KASAN_SHADOW_SCALE_SIZE);
+	size_t padding_size = round_up(size, KASAN_ALLOCA_REDZONE_SIZE) -
+			rounded_up_size;
+	size_t rounded_down_size = round_down(size, KASAN_SHADOW_SCALE_SIZE);
+
+	const void *left_redzone = (const void *)(addr -
+			KASAN_ALLOCA_REDZONE_SIZE);
+	const void *right_redzone = (const void *)(addr + rounded_up_size);
+
+	WARN_ON(!IS_ALIGNED(addr, KASAN_ALLOCA_REDZONE_SIZE));
+
+	kasan_unpoison_shadow((const void *)(addr + rounded_down_size),
+			      size - rounded_down_size);
+	kasan_poison_shadow(left_redzone, KASAN_ALLOCA_REDZONE_SIZE,
+			KASAN_ALLOCA_LEFT);
+	kasan_poison_shadow(right_redzone,
+			padding_size + KASAN_ALLOCA_REDZONE_SIZE,
+			KASAN_ALLOCA_RIGHT);
+}
+EXPORT_SYMBOL(__asan_alloca_poison);
+
+/* Emitted by compiler to unpoison alloca()ed areas when the stack unwinds. */
+void __asan_allocas_unpoison(const void *stack_top, const void *stack_bottom)
+{
+	if (unlikely(!stack_top || stack_top > stack_bottom))
+		return;
+
+	kasan_unpoison_shadow(stack_top, stack_bottom - stack_top);
+}
+EXPORT_SYMBOL(__asan_allocas_unpoison);
+
 #ifdef CONFIG_MEMORY_HOTPLUG
 static int __meminit kasan_mem_notifier(struct notifier_block *nb,
 			unsigned long action, void *data)
diff -puN mm/kasan/kasan.h~kasan-support-alloca-poisoning mm/kasan/kasan.h
--- a/mm/kasan/kasan.h~kasan-support-alloca-poisoning
+++ a/mm/kasan/kasan.h
@@ -24,6 +24,14 @@
 #define KASAN_STACK_PARTIAL     0xF4
 #define KASAN_USE_AFTER_SCOPE   0xF8
 
+/*
+ * alloca redzone shadow values
+ */
+#define KASAN_ALLOCA_LEFT	0xCA
+#define KASAN_ALLOCA_RIGHT	0xCB
+
+#define KASAN_ALLOCA_REDZONE_SIZE	32
+
 /* Don't break randconfig/all*config builds */
 #ifndef KASAN_ABI_VERSION
 #define KASAN_ABI_VERSION 1
diff -puN mm/kasan/report.c~kasan-support-alloca-poisoning mm/kasan/report.c
--- a/mm/kasan/report.c~kasan-support-alloca-poisoning
+++ a/mm/kasan/report.c
@@ -102,6 +102,10 @@ static const char *get_shadow_bug_type(s
 	case KASAN_USE_AFTER_SCOPE:
 		bug_type = "use-after-scope";
 		break;
+	case KASAN_ALLOCA_LEFT:
+	case KASAN_ALLOCA_RIGHT:
+		bug_type = "alloca-out-of-bounds";
+		break;
 	}
 
 	return bug_type;
diff -puN scripts/Makefile.kasan~kasan-support-alloca-poisoning scripts/Makefile.kasan
--- a/scripts/Makefile.kasan~kasan-support-alloca-poisoning
+++ a/scripts/Makefile.kasan
@@ -32,7 +32,8 @@ else
 	$(call cc-param,asan-globals=1) \
 	$(call cc-param,asan-instrumentation-with-call-threshold=$(call_threshold)) \
 	$(call cc-param,asan-stack=1) \
-	$(call cc-param,asan-use-after-scope=1)
+	$(call cc-param,asan-use-after-scope=1) \
+	$(call cc-param,asan-instrument-allocas=1)
    endif
 
 endif
_

Patches currently in -mm which might be from paullawrence@xxxxxxxxxx are


--
To unsubscribe from this list: send the line "unsubscribe mm-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [Kernel Archive]     [IETF Annouce]     [DCCP]     [Netdev]     [Networking]     [Security]     [Bugtraq]     [Yosemite]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Linux SCSI]

  Powered by Linux