linux-kernel - Re: [PATCH] IMA: allow/fix UML builds

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Date:   Tue, 14 Mar 2023 14:28:29 -0400
From:   Mimi Zohar <zohar@...ux.ibm.com>
To:     Randy Dunlap <rdunlap@...radead.org>, linux-kernel@...r.kernel.org
Cc:     Dmitry Kasatkin <dmitry.kasatkin@...il.com>,
        linux-integrity@...r.kernel.org,
        Fabio Estevam <festevam@...il.com>,
        Rajiv Andrade <srajiv@...ux.vnet.ibm.com>,
        Richard Weinberger <richard@....at>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        Johannes Berg <johannes@...solutions.net>,
        linux-um@...ts.infradead.org
Subject: Re: [PATCH] IMA: allow/fix UML builds

On Thu, 2023-02-23 at 19:27 -0800, Randy Dunlap wrote:
> UML supports HAS_IOMEM since 0bbadafdc49d (um: allow disabling
> NO_IOMEM).
> 
> Current IMA build on UML fails on allmodconfig (with TCG_TPM=m):
> 
> ld: security/integrity/ima/ima_queue.o: in function `ima_add_template_entry':
> ima_queue.c:(.text+0x2d9): undefined reference to `tpm_pcr_extend'
> ld: security/integrity/ima/ima_init.o: in function `ima_init':
> ima_init.c:(.init.text+0x43f): undefined reference to `tpm_default_chip'
> ld: security/integrity/ima/ima_crypto.o: in function `ima_calc_boot_aggregate_tfm':
> ima_crypto.c:(.text+0x1044): undefined reference to `tpm_pcr_read'
> ld: ima_crypto.c:(.text+0x10d8): undefined reference to `tpm_pcr_read'
> 
> Modify the IMA Kconfig entry so that it selects TCG_TPM if HAS_IOMEM
> is set, regardless of the UML Kconfig setting.
> This updates TCG_TPM from =m to =y and fixes the linker errors.
> 
> Fixes: f4a0391dfa91 ("ima: fix Kconfig dependencies")
> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>

Indicating this resolves a commit which was upstreamed in linux-3.4,
while the fix for that commit 0bbadafdc49d ("um: allow disabling
NO_IOMEM") was upstreamed only in linux-5.14, leaves out an important
detail.

Is the proper way of indicating this disconnect by adding to the fixes
line the kernel?
Fixes: f4a0391dfa91 ("ima: fix Kconfig dependencies") # v5.14+

-- 
thanks,

Mimi