Messages in this thread | | | From | tedheadster <> | Date | Tue, 6 Feb 2018 15:45:35 -0500 | Subject | Re: [BUG] x86 : i486 reporting to be vulnerable to Meltdown/Spectre_V1/Spectre_V2 |
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On Tue, Feb 6, 2018 at 2:24 PM, tedheadster <tedheadster@gmail.com> wrote: > On Tue, Feb 6, 2018 at 2:17 PM, David Woodhouse <dwmw2@infradead.org> wrote: >> On Tue, 2018-02-06 at 11:13 -0800, Guenter Roeck wrote: >>> On Tue, Feb 06, 2018 at 07:10:27PM +0000, David Woodhouse wrote: >>> > >>> > >>> > >>> > On Tue, 2018-02-06 at 11:02 -0800, Greg Kroah-Hartman wrote: >>> > > >>> > > . >>> > > > >>> > > > >>> > > > David >>> > > > I believe I got the patch(es) you mention in in the stable 4.15.1 kernel: >>> > > > >>> > > > Pull x86/pti updates from Thomas Gleixner: "Another set of melted >>> > > > spectrum related changes" >>> > > > (commit 6304672b7f0a5c010002e63a075160856dc4f88d). >>> > > > >>> > > > Unfortunately, the symptoms I reported remain on at least the i486 and i686. >>> > > Can you try 4.15.2-rc1? Or how about Linus's kernel tree now? There >>> > > was a lot of spectrum patches merged just this week that were not in >>> > > 4.15.1. >>> > No, for the 486 it *should* have worked. The interesting commit >>> > is fec9434a12 ("x86/pti: Do not enable PTI on CPUs which are not >>> > vulnerable to Meltdown") which is indeed pulled in with the merge >>> > commit that Matthew mentions. >>> > >>> I disagree. >>> >>> $ git describe >>> v4.15.1-61-g7ab5513e4cbc >>> $ git log --oneline v4.15.1.. | grep Melt >>> 3472b3689bab x86/pti: Do not enable PTI on CPUs which are not vulnerable to Meltdown >> >> Ah right, for 4.15.1 perhaps yes. I was looking at Matthew's 'commit >> 6304672b7f0a5c010002e63a075160856dc4f88d' which isn't in 4.15.1 at all; >> that's the commit in Linus' tree where he pulled in the fix. So *that* >> one should have had it. >
Okay, I did a 'git pull' from Linus' tree and rebuilt. I _believe_ I have the correct patches from this information:
localhost /usr/src/linux # git log | grep "Do not enable PTI on CPUs which are not vulnerable to Meltdown" Fixes: fec9434a12f3 ("x86/pti: Do not enable PTI on CPUs which are not vulnerable to Meltdown") x86/pti: Do not enable PTI on CPUs which are not vulnerable to Meltdown x86/pti: Do not enable PTI on CPUs which are not vulnerable to Meltdown
localhost /usr/src/linux # git log | grep -A8 6304672b7f0a5c010002e63a075160856dc4f88d commit 6304672b7f0a5c010002e63a075160856dc4f88d Merge: 942633523cde 64e16720ea08 Author: Linus Torvalds <torvalds@linux-foundation.org> Date: Mon Jan 29 19:08:02 2018 -0800
Merge branch 'x86-pti-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86/pti updates from Thomas Gleixner: "Another set of melted spectrum related changes:
If that is correct (and I might be wrong), then I am up to date and I am still getting the following in /proc/cpuinfo on my Pentium 4M i686:
bugs : cpu_meltdown spectre_v1 spectre_v2
- Matthew
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