Funny.
This is exactly a selling item for SLES. Reloading the kernel without rebooting.
From: "Patrick O'Callaghan" <pocallaghan@gmail.commailto:pocallaghan@gmail.com> Date: Saturday, 26 September 2020 at 10:42:34 To: "users@lists.fedoraproject.org" <users@lists.fedoraproject.orgmailto:users@lists.fedoraproject.org> Subject: Re: Reload kernel?
On Sat, 2020-09-26 at 00:38 -0700, ToddAndMargo via users wrote:
Hi All,
Is there a way to reload or restart the kernel without having to reboot?
No.
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On 2020-09-27 04:47, Patrick O'Callaghan wrote:
On Sat, 2020-09-26 at 18:31 +0000, J.Witvliet--- via users wrote:
This is exactly a selling item for SLES. Reloading the kernel without rebooting.
A reference would be useful.
Probably this. https://www.suse.com/products/live-patching/
On Sun, 2020-09-27 at 06:55 +0800, Ed Greshko wrote:
On 2020-09-27 04:47, Patrick O'Callaghan wrote:
On Sat, 2020-09-26 at 18:31 +0000, J.Witvliet--- via users wrote:
This is exactly a selling item for SLES. Reloading the kernel without rebooting.
A reference would be useful.
Probably this. https://www.suse.com/products/live-patching/
Thanks Ed. I was unaware of this. Do you know if SUSE have submitted this upstream?
poc
On 2020-09-27 18:19, Patrick O'Callaghan wrote:
On Sun, 2020-09-27 at 06:55 +0800, Ed Greshko wrote:
On 2020-09-27 04:47, Patrick O'Callaghan wrote:
On Sat, 2020-09-26 at 18:31 +0000, J.Witvliet--- via users wrote:
This is exactly a selling item for SLES. Reloading the kernel without rebooting.
A reference would be useful.
Probably this. https://www.suse.com/products/live-patching/
Thanks Ed. I was unaware of this. Do you know if SUSE have submitted this upstream?
No idea. It is called a "subscription offering" in their literature. I think that means it is an additional cost over the SLES price. And the patch targets appear to be security patches. Not general bug fixes.
On Saturday, September 26, 2020 4:47:10 PM EDT Patrick O'Callaghan wrote:
On Sat, 2020-09-26 at 18:31 +0000, J.Witvliet--- via users wrote:
This is exactly a selling item for SLES. Reloading the kernel without rebooting.
A reference would be useful.
https://lwn.net/Articles/775264/ leads to this reference, https://lwn.net/Kernel/Index/#Live_patching
Live patching Ksplice: kernel patches without reboots (April 29, 2008) Ksplice and kreplace (November 24, 2008) Followups: performance counters, ksplice, and fsnotify (December 17, 2008) The initial kGraft submission (April 30, 2014) The first kpatch submission (May 7, 2014) A rough patch for live patching (February 25, 2015) Compile-time stack validation (September 30, 2015) Topics in live kernel patching (November 14, 2016) Live patching for CPU vulnerabilities (December 20, 2018)
On Sun, 2020-09-27 at 11:54 -0400, Garry T. Williams wrote:
On Saturday, September 26, 2020 4:47:10 PM EDT Patrick O'Callaghan wrote:
On Sat, 2020-09-26 at 18:31 +0000, J.Witvliet--- via users wrote:
This is exactly a selling item for SLES. Reloading the kernel without rebooting.
A reference would be useful.
https://lwn.net/Articles/775264/ leads to this reference, https://lwn.net/Kernel/Index/#Live_patching
Live patching Ksplice: kernel patches without reboots (April 29, 2008) Ksplice and kreplace (November 24, 2008) Followups: performance counters, ksplice, and fsnotify (December 17, 2008) The initial kGraft submission (April 30, 2014) The first kpatch submission (May 7, 2014) A rough patch for live patching (February 25, 2015) Compile-time stack validation (September 30, 2015) Topics in live kernel patching (November 14, 2016) Live patching for CPU vulnerabilities (December 20, 2018)
All very interesting (really). However it's not exactly "reloading the kernel without rebooting", but being able to dynamically patch the code of selected kernel functions *without* changing data structures. It certainly has a use case but I don't think it's what the OP was looking for.
poc
On Sun, Sep 27, 2020 at 12:56 AM Ed Greshko ed.greshko@greshko.com wrote:
On 2020-09-27 04:47, Patrick O'Callaghan wrote:
On Sat, 2020-09-26 at 18:31 +0000, J.Witvliet--- via users wrote:
This is exactly a selling item for SLES. Reloading the kernel without rebooting.
A reference would be useful.
Probably this. https://www.suse.com/products/live-patching/
Ubuntu and RHEL provide a similar service.
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Ed Greshko -
Garry T. Williams -
J.Witvliet＠mindef.nl -
Patrick O'Callaghan -
Tom H