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authorPaul Lawrence <paullawrence@google.com>2018-02-07 02:36:11 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2018-02-07 05:32:42 +0300
commit342061ee4ef3d80001d1ae494378f3979c861dba (patch)
tree0441486ae0c2df8e8edad38a70aa62515235eb02 /scripts
parent1a69e7ce8391a8bc808baf04e06d88ab4024ca47 (diff)
downloadlinux-342061ee4ef3d80001d1ae494378f3979c861dba.tar.xz
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@google.com Signed-off-by: Greg Hackmann <ghackmann@google.com> Signed-off-by: Paul Lawrence <paullawrence@google.com> Acked-by: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Alexander Potapenko <glider@google.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Masahiro Yamada <yamada.masahiro@socionext.com> Cc: Matthias Kaehlcke <mka@chromium.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'scripts')
-rw-r--r--scripts/Makefile.kasan3
1 files changed, 2 insertions, 1 deletions
diff --git a/scripts/Makefile.kasan b/scripts/Makefile.kasan
index ab85095c3a75..3fb382c69ff6 100644
--- a/scripts/Makefile.kasan
+++ b/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