** Summary changed:
- x86/pti: 32-Bit x86 systems support already available.
+ x86/pti: 32-bit x86 systems support already available.
** Description changed:
Hello.
- Linux kernel v4.19 release candidate [1], finally have kernel page-table
- isolation ('PTI', previously known as 'KAISER') support for x86_32
- architecture. 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, kernel page-
- table isolation wasn't available on 32-Bit x86 systems. Until now.
+ 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 mean
- x86_32 bit architecture, of course. 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.
+ 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 implementing on 32-Bit x86
- architecture, plase check - for example - commit '7757d607c6b31'
- ("x86/pti: Allow CONFIG_PAGE_TABLE_ISOLATION for x86_32"). Here are
- messages about 'PTI' support (PATCH v7, v8) for x86_32 [1]. Next, 'PTI'
- fixes for x86-32 [2] and more patches related to 'x86/mm/pti' [3]. There
- is also a short report for the first half of the 4.19 kernel merge
- window [4].
+ 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):
- I'm sorry for such a long message, but I'm very happy that 'PTI' support
- is already available for x86_32 architecture and I hope, that it will be
- backported to all Ubuntu LTS releases etc.
+ ✗ 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.
- ______________________
-
- [1] http://lkml.iu.edu/hypermail/linux/kernel/1807.1/03578.html (please see
every next patches etc.)
- http://lkml.iu.edu/hypermail/linux/kernel/1807.1/03181.html
- http://lkml.iu.edu/hypermail/linux/kernel/1807.2/02790.html
- [2] http://lkml.iu.edu/hypermail/linux/kernel/1808.0/05516.html
- [3] http://lkml.iu.edu/hypermail/linux/kernel/1807.1/03161.html
- [4] https://lwn.net/Articles/762566/ (See "Architecture-specific" changes)
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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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