80a9201a59
For KASAN builds: - switch SLUB allocator to using stackdepot instead of storing the allocation/deallocation stacks in the objects; - change the freelist hook so that parts of the freelist can be put into the quarantine. [aryabinin@virtuozzo.com: fixes] Link: http://lkml.kernel.org/r/1468601423-28676-1-git-send-email-aryabinin@virtuozzo.com Link: http://lkml.kernel.org/r/1468347165-41906-3-git-send-email-glider@google.com Signed-off-by: Alexander Potapenko <glider@google.com> Cc: Andrey Konovalov <adech.fo@gmail.com> Cc: Christoph Lameter <cl@linux.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Steven Rostedt (Red Hat) <rostedt@goodmis.org> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Kostya Serebryany <kcc@google.com> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Kuthonuzo Luruo <kuthonuzo.luruo@hpe.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
57 lines
1.8 KiB
Plaintext
57 lines
1.8 KiB
Plaintext
config HAVE_ARCH_KASAN
|
|
bool
|
|
|
|
if HAVE_ARCH_KASAN
|
|
|
|
config KASAN
|
|
bool "KASan: runtime memory debugger"
|
|
depends on SLUB || (SLAB && !DEBUG_SLAB)
|
|
select CONSTRUCTORS
|
|
select STACKDEPOT
|
|
help
|
|
Enables kernel address sanitizer - runtime memory debugger,
|
|
designed to find out-of-bounds accesses and use-after-free bugs.
|
|
This is strictly a debugging feature and it requires a gcc version
|
|
of 4.9.2 or later. Detection of out of bounds accesses to stack or
|
|
global variables requires gcc 5.0 or later.
|
|
This feature consumes about 1/8 of available memory and brings about
|
|
~x3 performance slowdown.
|
|
For better error detection enable CONFIG_STACKTRACE.
|
|
Currently CONFIG_KASAN doesn't work with CONFIG_DEBUG_SLAB
|
|
(the resulting kernel does not boot).
|
|
|
|
choice
|
|
prompt "Instrumentation type"
|
|
depends on KASAN
|
|
default KASAN_OUTLINE
|
|
|
|
config KASAN_OUTLINE
|
|
bool "Outline instrumentation"
|
|
help
|
|
Before every memory access compiler insert function call
|
|
__asan_load*/__asan_store*. These functions performs check
|
|
of shadow memory. This is slower than inline instrumentation,
|
|
however it doesn't bloat size of kernel's .text section so
|
|
much as inline does.
|
|
|
|
config KASAN_INLINE
|
|
bool "Inline instrumentation"
|
|
help
|
|
Compiler directly inserts code checking shadow memory before
|
|
memory accesses. This is faster than outline (in some workloads
|
|
it gives about x2 boost over outline instrumentation), but
|
|
make kernel's .text size much bigger.
|
|
This requires a gcc version of 5.0 or later.
|
|
|
|
endchoice
|
|
|
|
config TEST_KASAN
|
|
tristate "Module for testing kasan for bug detection"
|
|
depends on m && KASAN
|
|
help
|
|
This is a test module doing various nasty things like
|
|
out of bounds accesses, use after free. It is useful for testing
|
|
kernel debugging features like kernel address sanitizer.
|
|
|
|
endif
|