lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Wed, 26 Jun 2019 10:20:12 -0700 From: Evan Green <evgreen@...omium.org> To: Thomas Gleixner <tglx@...utronix.de> Cc: LKML <linux-kernel@...r.kernel.org>, x86@...nel.org, Borislav Petkov <bp@...en8.de> Subject: Re: [PATCH] x86/microcode: Fix the microcode load on CPU hotplug for real On Tue, Jun 18, 2019 at 1:31 PM Thomas Gleixner <tglx@...utronix.de> wrote: > > A recent change moved the microcode loader hotplug callback into the early > startup phase, which is running with interrupts disabled. It missed that > the callbacks invoke sysfs functions which might sleep causing nice 'might > sleep' splats with proper debugging enabled. > > Split the callbacks and only load the microcode in the early startup phase > and move the sysfs handling back into the later threaded and preemptible > bringup phase where it was before. > > Fixes: 78f4e932f776 ("x86/microcode, cpuhotplug: Add a microcode loader CPU hotplug callback") > Signed-off-by: Thomas Gleixner <tglx@...utronix.de> I ran into the bug fixed by this. For 4.19: Tested-by: Evan Green <evgreen@...omium.org>
Powered by blists - more mailing lists