Entreprise française de cybersécurité depuis 2004
☎ 03 60 47 09 81 - info@securiteinfo.com
☎ 03 60 47 09 81 - info@securiteinfo.com
In the Linux kernel, the following vulnerability has been resolved:fs/proc: fix softlockup in __read_vmcore (part 2)Since commit 5cbcb62dddf5 ("fs/proc: fix softlockup in __read_vmcore") thenumber of softlockups in __read_vmcore at kdump time have gone down, butthey still happen sometimes.In a memory constrained environment like the kdump image, a softlockup isnot just a harmless message, but it can interfere with things like RCUfreeing memory, causing the crashdump to get stuck.The second loop in __read_vmcore has a lot more opportunities for naturalsleep points, like scheduling out while waiting for a data write tohappen, but apparently that is not always enough.Add a cond_resched() to the second loop in __read_vmcore to (hopefully)get rid of the softlockups.
No PoCs from references.
- https://github.com/w4zu/Debian_security