Re: android adeb KASAN_SHADOW_SCALE_SHIFT


Yonghong Song
 

Unfortunately, the value is defined in Makefile,

```
ifeq ($(CONFIG_KASAN_SW_TAGS), y)
KASAN_SHADOW_SCALE_SHIFT := 4
else ifeq ($(CONFIG_KASAN_GENERIC), y)
KASAN_SHADOW_SCALE_SHIFT := 3
endif

KBUILD_CFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
KBUILD_CPPFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
KBUILD_AFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
```

We could add something above in helpers.h e.g.,
```
#if defined(__aarch64__)
#if defined(CONFIG_KASAN_SW_TAGS)
#define KASAN_SHADOW_SCALE_SHIFT 4
#elif defined(CONFIG_KASAN_GENERIC)
#define KASAN_SHADOW_SCALE_SHIFT 3
#endif
#endif
```

You can also add the above code to the tool itself.

On Wed, Feb 10, 2021 at 10:18 AM katrina lulz
<anotherworkqueue@...> wrote:

Hi *,
I managed to setup adeb on a pixel4 with custom kernel compiled as suggested by adeb's README.
The setup is working fine for some BCC tools, as vfsstat but a few as opensnoop and the trace command return the following error:

In file included from ./arch/arm64/include/asm/thread_info.h:13:
./arch/arm64/include/asm/memory.h:136:24: error: use of undeclared identifier 'KASAN_SHADOW_SCALE_SHIFT'
return kimage_vaddr - KIMAGE_VADDR;

I verified by the config.gz on the device that IKHEADERS and the other BPF related configs are correctly enabled.
Any ideas on how to fix the above error?

thanks,
best.

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