Dear Martin Liška
Thanks for your research. I have resolved this problem by pass a ddrsize
paramters when build and cacluate the offset used by -fasan-shadow-offset
according that parameter.
Thanks!
B.R.
tao.z...@amlogic.com
Address： Building E5, 2555 Xiupu Road, Pudong District, Shanghai, China
公司地址：上海市浦东新区秀浦路2555号漕河泾康桥商务绿洲E5栋
发件人： Martin Liška
发送时间： 2022-11-26 00:23
收件人： tao.z...@amlogic.com; gcc
抄送： Jakub Jelinek
主题： Re: About -fasan-shadow-offset option
[ EXTERNAL EMAIL ]
On 11/16/22 10:01, tao.z...@amlogic.com wrote:
> Dear gcc:
>
Hello.
Based on quick discussion with Jakub, we believe fasan-shadow-symbol=xxxx would
be a non-trivial amount of work
and we rather suggest doing a per-system build with investigated
-fasan-shadow-offset.
Cheers,
Martin
> I am developing a address sanitiser tools for u-boot. Basically refers
> compile options from kernel side. But there is a problem that I must set
> -fasan-shadow-offset with a pre-calculated value. Otherwise GCC compiler will
> use 0x1000000000 as default value for shadow offset and caused boot failed
> because this value is too large.
> The problem is uboot do not have a fixed memory layout as kernel.
> Basically it will relocate to end of DDR size and running at that memory
> space. Usually memory map for uboot is virt=phys and there are lots of
> drivers do not do address translate for dma based on this mapping. But ddr
> size are different on each platform. So it's hard to handle shadow offset at
> this scenario.
> My point is that can gcc add an option like -fasan-shadow-symbol=xxxx,
> here xxxx is a global variable and implementors can configure it's value
> based on platforms ddr size/malloc buffer size during initialize stage and
> this variable can be used for shadow address calculation during runtime. This
> may be more fitable compared than a fixed value during compile stage. And is
> there any other options to help my problem?
> Waiting for your response asap.
> Thanks.
>
>
>
> Thanks!
> B.R.
> tao.z...@amlogic.com
>
> Address： Building E5, 2555 Xiupu Road, Pudong District, Shanghai, China
> 公司地址：上海市浦东新区秀浦路2555号漕河泾康桥商务绿洲E5栋
>
