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SubjectRe: linux-next: Tree for Aug 22 (evm)
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Hi,

On Mon, Aug 22, 2011 at 3:53 PM, Randy Dunlap <rdunlap@xenotime.net> wrote:
> On Mon, 22 Aug 2011 14:53:04 +1000 Stephen Rothwell wrote:
>
>> Hi all,
>>
>> [The kernel.org mirroring is a bit low today]
>
> (on x86_64:)
>
> When CONFIG_EVM=y, CONFIG_CRYPTO_HASH2=m, CONFIG_TRUSTED_KEYS=m,
> CONFIG_ENCRYPTED_KEYS=m, the build fails with:
>
> (.text+0x378aa): undefined reference to `key_type_encrypted'
> evm_crypto.c:(.text+0x37992): undefined reference to `crypto_alloc_shash'
> evm_crypto.c:(.text+0x37a24): undefined reference to `crypto_shash_setkey'
> evm_crypto.c:(.text+0x37ad9): undefined reference to `crypto_shash_update'
> evm_crypto.c:(.text+0x37aeb): undefined reference to `crypto_shash_final'
> (.text+0x37b4b): undefined reference to `crypto_shash_update'
> (.text+0x37c61): undefined reference to `crypto_shash_update'
> (.text+0x37cb9): undefined reference to `crypto_shash_update'
>
> even though EVM (Kconfig) selects ENCRYPTED_KEYS and TRUSTED_KEYS..
> and even after I add "select CRYPTO_HASH2".
>
> Is this because EVM is bool and kconfig is confused about 'select's
> when a bool is selecting tristates?  Shouldn't the tristates become
> 'y' instead of 'm' if they are selected by a bool that is 'y'?
>
hum, I'd say that it should:

% cat Kconfig
config MOD
bool
default y
option modules

config B
tristate "B"
default m

config A
tristate "A"
default y
select B

% make alldefconfig
scripts/kconfig/conf --alldefconfig Kconfig
#
# configuration written to .config
#

% cat .config
#
# Automatically generated file; DO NOT EDIT.
# Linux Kernel Configuration
#
CONFIG_MOD=y
CONFIG_B=y
CONFIG_A=y

now, if A defaults to 'm', we have:

% cat .config
#
# Automatically generated file; DO NOT EDIT.
# Linux Kernel Configuration
#
CONFIG_MOD=y
CONFIG_B=m
CONFIG_A=m

Could you please produce a reduced testcase showing the problem ?

Thanks,
- Arnaud

>
> xconfig shows these symbol values:
>
> Symbol: EVM [=y]
> Type : boolean
> Prompt: EVM support
> Defined at security/integrity/evm/Kconfig:1
> Depends on: SECURITY [=y] && KEYS [=y] && TCG_TPM [=m]
> Location:
> -> Security options
> Selects: CRYPTO_HMAC [=m] && CRYPTO_MD5 [=m] && CRYPTO_SHA1 [=m] && CRYPTO_HASH2 [=m] && ENCRYPTED_KEYS [=m] && TRUSTED_KEYS [=m]
>
>
> Hm, changing TCG_TPM to =y also changes TRUSTED_KEYS and ENCRYPTED_KEYS and
> lots of CRYPTO_ symbols from =m to =y.  There must be some kind of min/max
> symbol checking that is confused?
>
> ---
> ~Randy
> *** Remember to use Documentation/SubmitChecklist when testing your code ***
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