CONFIG_RELOCATABLE and CONFIG_KASAN cannot be enabled at the same time
on ppce500 fsl_booke. All functions called before kasan_early_init()
should be disabled with kasan check. When CONFIG_RELOCATABLE is enabled
on ppce500 fsl_booke, relocate_init() is called before kasan_early_init()
which triggers kasan check and results in boot failure.
Call trace and functions which triggers kasan check(*):
- _start
- set_ivor
- relocate_init(*)
- early_get_first_memblock_info(*)
- of_scan_flat_dt(*)
...
- kasan_early_init
Potential solutions could be 1. implement relocate_init and all its children
function in a seperate file or 2. introduce a global vairable in KASAN, only
enable KASAN check when init is done.
Disable KASAN when RELOCATABLE is selected on fsl_booke for now until
it is supported.
Signed-off-by: Lexi Shao <[email protected]>
---
arch/powerpc/Kconfig | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 3e56c9c2f16e..14f3da63c088 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -171,7 +171,7 @@ config PPC
select HAVE_ARCH_AUDITSYSCALL
select HAVE_ARCH_HUGE_VMAP if PPC_BOOK3S_64 && PPC_RADIX_MMU
select HAVE_ARCH_JUMP_LABEL
- select HAVE_ARCH_KASAN if PPC32
+ select HAVE_ARCH_KASAN if PPC32 && !(RELOCATABLE && FSL_BOOKE)
select HAVE_ARCH_KGDB
select HAVE_ARCH_MMAP_RND_BITS
select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
--
2.12.3
Le 29/11/2019 à 08:04, Lexi Shao a écrit :
> CONFIG_RELOCATABLE and CONFIG_KASAN cannot be enabled at the same time
> on ppce500 fsl_booke. All functions called before kasan_early_init()
> should be disabled with kasan check. When CONFIG_RELOCATABLE is enabled
> on ppce500 fsl_booke, relocate_init() is called before kasan_early_init()
> which triggers kasan check and results in boot failure.
> Call trace and functions which triggers kasan check(*):
> - _start
> - set_ivor
> - relocate_init(*)
> - early_get_first_memblock_info(*)
> - of_scan_flat_dt(*)
> ...
> - kasan_early_init
>
> Potential solutions could be 1. implement relocate_init and all its children
> function in a seperate file or 2. introduce a global vairable in KASAN, only
> enable KASAN check when init is done.
Solution 1 seems uneasy. of_scan_flat_dt() and children are general
functions that can't be set aside.
Solution 2 would destroy performance, and would anyway not work with
inline instrumentation.
Have you tried moving the call to kasan_early_init() before the call of
relocate_init() ?
On other PPC32, kasan_early_init() is the first thing done after
activating the MMU. But AFAIU, MMU is always active on BOOKE though.
Christophe
>
> Disable KASAN when RELOCATABLE is selected on fsl_booke for now until
> it is supported.
>
> Signed-off-by: Lexi Shao <[email protected]>
> ---
> arch/powerpc/Kconfig | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
> index 3e56c9c2f16e..14f3da63c088 100644
> --- a/arch/powerpc/Kconfig
> +++ b/arch/powerpc/Kconfig
> @@ -171,7 +171,7 @@ config PPC
> select HAVE_ARCH_AUDITSYSCALL
> select HAVE_ARCH_HUGE_VMAP if PPC_BOOK3S_64 && PPC_RADIX_MMU
> select HAVE_ARCH_JUMP_LABEL
> - select HAVE_ARCH_KASAN if PPC32
> + select HAVE_ARCH_KASAN if PPC32 && !(RELOCATABLE && FSL_BOOKE)
> select HAVE_ARCH_KGDB
> select HAVE_ARCH_MMAP_RND_BITS
> select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
>
Le 29/11/2019 à 08:46, Christophe Leroy a écrit :
>
>
> Le 29/11/2019 à 08:04, Lexi Shao a écrit :
>> CONFIG_RELOCATABLE and CONFIG_KASAN cannot be enabled at the same time
>> on ppce500 fsl_booke. All functions called before kasan_early_init()
>> should be disabled with kasan check. When CONFIG_RELOCATABLE is enabled
>> on ppce500 fsl_booke, relocate_init() is called before kasan_early_init()
>> which triggers kasan check and results in boot failure.
>> Call trace and functions which triggers kasan check(*):
>> - _start
>> - set_ivor
>> - relocate_init(*)
>> - early_get_first_memblock_info(*)
>> - of_scan_flat_dt(*)
>> ...
>> - kasan_early_init
>>
>> Potential solutions could be 1. implement relocate_init and all its
>> children
>> function in a seperate file or 2. introduce a global vairable in
>> KASAN, only
>> enable KASAN check when init is done.
>
> Solution 1 seems uneasy. of_scan_flat_dt() and children are general
> functions that can't be set aside.
> Solution 2 would destroy performance, and would anyway not work with
> inline instrumentation.
>
> Have you tried moving the call to kasan_early_init() before the call of
> relocate_init() ?
I just tried it with QEMU, it works. I'll send a patch out soon.
Christophe
> On other PPC32, kasan_early_init() is the first thing done after
> activating the MMU. But AFAIU, MMU is always active on BOOKE though.
>
> Christophe
>
>>
>> Disable KASAN when RELOCATABLE is selected on fsl_booke for now until
>> it is supported.
>>
>> Signed-off-by: Lexi Shao <[email protected]>
>> ---
>> arch/powerpc/Kconfig | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
>> index 3e56c9c2f16e..14f3da63c088 100644
>> --- a/arch/powerpc/Kconfig
>> +++ b/arch/powerpc/Kconfig
>> @@ -171,7 +171,7 @@ config PPC
>> select HAVE_ARCH_AUDITSYSCALL
>> select HAVE_ARCH_HUGE_VMAP if PPC_BOOK3S_64 && PPC_RADIX_MMU
>> select HAVE_ARCH_JUMP_LABEL
>> - select HAVE_ARCH_KASAN if PPC32
>> + select HAVE_ARCH_KASAN if PPC32 && !(RELOCATABLE &&
>> FSL_BOOKE)
>> select HAVE_ARCH_KGDB
>> select HAVE_ARCH_MMAP_RND_BITS
>> select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
>>
>Le 29/11/2019 à 08:46, Christophe Leroy a écrit :
>>
>>
>> Le 29/11/2019 à 08:04, Lexi Shao a écrit :
>>> CONFIG_RELOCATABLE and CONFIG_KASAN cannot be enabled at the same
>>> time on ppce500 fsl_booke. All functions called before
>>> kasan_early_init() should be disabled with kasan check. When
>>> CONFIG_RELOCATABLE is enabled on ppce500 fsl_booke, relocate_init()
>>> is called before kasan_early_init() which triggers kasan check and results in boot failure.
>>> Call trace and functions which triggers kasan check(*):
>>> - _start
>>> - set_ivor
>>> - relocate_init(*)
>>> - early_get_first_memblock_info(*)
>>> - of_scan_flat_dt(*)
>>> ...
>>> - kasan_early_init
>>>
>>> Potential solutions could be 1. implement relocate_init and all its
>>> children function in a seperate file or 2. introduce a global
>>> vairable in KASAN, only enable KASAN check when init is done.
>>
>> Solution 1 seems uneasy. of_scan_flat_dt() and children are general
>> functions that can't be set aside.
>> Solution 2 would destroy performance, and would anyway not work with
>> inline instrumentation.
>>
>> Have you tried moving the call to kasan_early_init() before the call
>> of
>> relocate_init() ?
>
>I just tried it with QEMU, it works. I'll send a patch out soon.
>
Yes I tried but couldn't get it to work on a P1010. There might be conflict
somewhere else with my kernel config. Will keep on debugging.
Thanks for the prompt reply and trying it out on qemu.
Lexi
>
>
>> On other PPC32, kasan_early_init() is the first thing done after
>> activating the MMU. But AFAIU, MMU is always active on BOOKE though.
>>
>> Christophe
>>
>>>
>>> Disable KASAN when RELOCATABLE is selected on fsl_booke for now until
>>> it is supported.
>>>
>>> Signed-off-by: Lexi Shao <[email protected]>
>>> ---
>>> arch/powerpc/Kconfig | 2 +-
>>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index
>>> 3e56c9c2f16e..14f3da63c088 100644
>>> --- a/arch/powerpc/Kconfig
>>> +++ b/arch/powerpc/Kconfig
>>> @@ -171,7 +171,7 @@ config PPC
>>> select HAVE_ARCH_AUDITSYSCALL
>>> select HAVE_ARCH_HUGE_VMAP if PPC_BOOK3S_64 &&
>>> PPC_RADIX_MMU
>>> select HAVE_ARCH_JUMP_LABEL
>>> - select HAVE_ARCH_KASAN if PPC32
>>> + select HAVE_ARCH_KASAN if PPC32 && !(RELOCATABLE &&
>>> FSL_BOOKE)
>>> select HAVE_ARCH_KGDB
>>> select HAVE_ARCH_MMAP_RND_BITS
>>> select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
>>>