** Tags added: kernel-daily-bug
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https://bugs.launchpad.net/bugs/1790688
Title:
x86/pti: 32-bit x86 systems support already available.
Status in linux package in Ubuntu:
Triaged
Bug description:
Hello.
This is a very good news: 'PTI' support for x86-32 architecture is
available. Linux kernel v4.19 release candidate, finally have Kernel
Page-Table Isolation ('PTI', previously known as 'KAISER') support. As
we know, 'PTI' provides protection against attack, known as the
"Meltdown" (CVE-2017-5754), that breaks isolation between user
applications and the operating system etc. However, this protection -
needed for "Meltdown" mitigation - wasn't available on 32-bit x86
systems. Until now.
So, I would like to ask a question: are there any plans to backport
Kernel Page-Table Isolation patches for Linux kernels available in
"Trusty"/14.04, "Xenial"/16.04 and "Bionic"/18.04 releases etc.? I'm
asking, because it seems, that pretty much no developers run 32-bit
any more. However, there still are many 32-bit users out there.
For more informations about how 'PTI' was implemented, created for 32
bit x86 architecture, please check - for example - commit
'7757d607c6b31' ("x86/pti: Allow CONFIG_PAGE_TABLE_ISOLATION for
x86_32") and these messages on lkml mailing list and lwn.net website
(which contains summary of the first half of the 4.19 kernel merge
window):
✗ http://lkml.iu.edu/hypermail/linux/kernel/1807.2/02790.html ('PTI' on
x86-32; PATCH v.8)
✗ https://lwn.net/Articles/762566/ (See "Architecture-specific" changes)
I would like to send a big "Thank You" to Mr Joerg Roedel (and Others,
of course) for his amazing work - a whole raft of measures and patches
to make this possible - to enable 'PTI' mitigation on x86-32
architecture etc.
Thanks, best regards.
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