Hello David,
On 03.06.22 15:28, david.safford@xxxxxxxxx wrote:
> When creating (sealing) a new trusted key, migratable
> trusted keys have the FIXED_TPM and FIXED_PERM attributes
> set, and non-migratable keys don't. This is backwards, and
> also causes creation to fail when creating a migratable key
> under a migratable parent. (The TPM thinks you are trying to
> seal a non-migratable blob under a migratable parent.)
>
> The following simple patch fixes the logic, and has been
> tested for all four combinations of migratable and non-migratable
> trusted keys and parent storage keys. With this logic, you will
> get a proper failure if you try to create a non-migratable
> trusted key under a migratable parent storage key, and all other
> combinations work correctly.
>
> david safford
Thanks for your patch. It looks sensible, but needs some work to
be aligned to the kernel patch guidelines, documented here:
Documentation/process/submitting-patches.rst
What I noticed in particular:
- Your Signed-off-by is missing
- Your patch title needs alignment to others in the revision history,
you could change it e.g. "KEYS: trusted: tpm2: Fix migratable logic"
- The To:/Cc: list is incomplete. Patches to this file are normally
merged via Jarkko's tree. get_maintainers.pl will produce a full list
of people and mailing lists to copy.
Looking forward to your v2.
Cheers,
Ahmad
> ---
> security/keys/trusted-keys/trusted_tpm2.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/security/keys/trusted-keys/trusted_tpm2.c b/security/keys/trusted-keys/trusted_tpm2.c
> index 0165da386289..2b2c8eb258d5 100644
> --- a/security/keys/trusted-keys/trusted_tpm2.c
> +++ b/security/keys/trusted-keys/trusted_tpm2.c
> @@ -283,8 +283,8 @@ int tpm2_seal_trusted(struct tpm_chip *chip,
> /* key properties */
> flags = 0;
> flags |= options->policydigest_len ? 0 : TPM2_OA_USER_WITH_AUTH;
> - flags |= payload->migratable ? (TPM2_OA_FIXED_TPM |
> - TPM2_OA_FIXED_PARENT) : 0;
> + flags |= payload->migratable ? 0 : (TPM2_OA_FIXED_TPM |
> + TPM2_OA_FIXED_PARENT);
> tpm_buf_append_u32(&buf, flags);
>
> /* policy */
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