On Thu Nov 7, 2024 at 1:40 AM EET, Jarkko Sakkinen wrote: > On Thu Nov 7, 2024 at 1:22 AM EET, Jarkko Sakkinen wrote: > > > I'm a bit confused here. It's TPM2_PCR_Extend we have the trouble with > > > (as Mimi says in her email that you quoted) not TPM2_GetRandom. > > > > > > The random number generator reseed occurs in a kernel thread that fires > > > about once a minute, so it doesn't show up in really any of the boot > > > timings. Plus even with sessions added, what there now isn't a > > > significant overhead even to the running kernel given it's asynchronous > > > and called infrequently. > > > > Ah, right then we need the boot flag, and my earlier comments to the > > parameter apply. I've never used IMA so I don't actually even know in > > detail how it is using TPM. > > > > Now that I did some seek I mixed this up with the report: > > > > https://chaos.social/@gromit/113345582873908273 > > > > Anyway concerning this issue and patch, my earlier comments still apply. > > Makes me wonder tho why do we then export tpm_get_random() in the first > place? HWRNG does not needed that export, and the code does not have any > of the mentioned features. I mean specifically the code for tpm_get_random() and tpm2_get_random(). BR, Jarkko
