Bug#1043585: Update on this issue

[Martin Johnson <martin.d.johnson@outlook.com>]

Hi Salvatore,

Ah, I see what you mean for the links, its an unfortunate copy paste 
error, I apologize about the duplicated links.

For clarification, it really should have been this one:

https://bugzilla.kernel.org/show_bug.cgi?id=217796

and this:

https://bugzilla.kernel.org/show_bug.cgi?id=217799

Both are issues related to the patch which also is breaking the emulated 
TPM.

Glad that all this info is helping to get this issue resolved :-)

Kind Regards,

Martin.

On 17/08/2023 19:32, Salvatore Bonaccorso wrote:
> Hi Martin,
>
> On Thu, Aug 17, 2023 at 05:10:44PM +0100, Martin Johnson wrote:
> > Hi Salvadore,
> >
> > Thanks for getting in contact regarding this issue,
> >
> > Yes I did mean to reference the two bugzilla entries, since it seems to be
> > the same patch that's causing issues with the emulated TPM, at least turning
> > off the mitigation the same way they do fixes the problem for me also with
> > the swtpm function.
> Still confused as the two links were the same, twice
> https://bugzilla.kernel.org/show_bug.cgi?id=217796
>
> > I did try to apply "x86/retpoline: Don't clobber RFLAGS during
> > srso_safe_ret()" patch as suggested, unfortunately it is incompatible with
> > the 6.1.38 Debian kernel source:
> >
> > --- I omitted some lines as there is a ton of text ---
> >
> > Applying patch 0052-Linux-6.1.33-rt11-REBASE.patch
> > Now at patch 0052-Linux-6.1.33-rt11-REBASE.patch
> > make[2]: Leaving directory
> > '/home/martin/opt/kernel/debian_test/linux-6.1.38'
> > make[1]: Leaving directory
> > '/home/martin/opt/kernel/debian_test/linux-6.1.38'
> > Importing patch /home/martin/opt/kernel/debian_test/patch.patch (stored as
> > debian/patches/test/patch.patch)
> > Applying patch debian/patches/test/patch.patch
> > patching file arch/x86/lib/retpoline.S
> > Hunk #1 FAILED at 164.
> > Hunk #2 FAILED at 239.
> > Hunk #3 FAILED at 252.
> > 3 out of 3 hunks FAILED -- rejects in file arch/x86/lib/retpoline.S
> > Patch debian/patches/test/patch.patch does not apply (enforce with -f)
> Okay this needs adjustment for 6.1.y.
>
> Thanks for confirming the issue beeing present as well in 6.4.11
> upstream and fixed with cherry-picking the commit, this is helpful.
>
> Regards,
> Salvatore