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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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