Preemptive verification: root@d05-3:~# cat /proc/version Linux version 4.10.0-29-generic (buildd@bos01-arm64-012) (gcc version 6.3.0 20170406 (Ubuntu/Linaro 6.3.0-12ubuntu2) ) #33-Ubuntu SMP Wed Jul 19 13:37:12 UTC 2017 root@d05-3:~# cat /proc/kcore > /dev/null& [1] 9206 root@d05-3:~#
(/proc/kcore is 133T on this system, so it won't complete in any reasonable time - but normally would've crashed by now). -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1702749 Title: arm64: fix crash reading /proc/kcore Status in linux package in Ubuntu: Fix Committed Status in linux source package in Zesty: Fix Committed Bug description: [Impact] Reading /proc/kcore can lead to a crash on arm64 systems. This was found to cause crashes when, e.g. annotating symbols in a perf top session. [Test Case] # cat /proc/kcore > /dev/null [Regression Risk] 2 upstream patches need to be cherry-picked to fix this. The 1st patch is a simplification to the kcore driver that impacts all architectures. Instead of re-checking at read time for vmalloc/module addresses, it just checks for a flag that was set during kcore driver init. This looks correct to me but could of course have an unnoticed bug. The second patch is arm64-specific, and regression risk has been mitigated by testing on arm64 hardware. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1702749/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
