I built a test kernel with commit 783c3b53b9506db3e05daacfe34e0287eebb09d8.
The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1777840
Can you test this kernel and see if it resolves this bug?
Note about installing test kernels:
• If the test kernel is prior to 4.15(Bionic) you need to install the
linux-image and linux-image-extra .deb packages.
• If the test kernel is 4.15(Bionic) or newer, you need to install the
linux-modules, linux-modules-extra and linux-image-unsigned .deb packages.
Thanks in advance!
** Changed in: linux (Ubuntu Bionic)
Assignee: (unassigned) => Joseph Salisbury (jsalisbury)
** Changed in: linux (Ubuntu)
Assignee: Skipper Bug Screeners (skipper-screen-team) => Joseph Salisbury
(jsalisbury)
** Changed in: linux (Ubuntu Bionic)
Status: Triaged => In Progress
** Changed in: linux (Ubuntu)
Status: Triaged => In Progress
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https://bugs.launchpad.net/bugs/1777840
Title:
uprobes: fix SIGSEGVs with setjmp/longjmp
Status in Ubuntu on IBM z Systems:
In Progress
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Bionic:
In Progress
Bug description:
Description: uprobes: fix SIGSEGVs with setjmp/longjmp
Symptom:
Setting a user space return probe on a function that does not
return because of a longjmp call may cause SIGSEGV or SIGILL.
Problem:
Userspace can do whatever it wants with its stack. Especially
stack modifications performed with longjmp cannot be handled 100%
correctly within the uprobes kernel part, which may lead to user
space observed crashed.
Solution:
Implement arch_uretprobe_is_alive() which improves the situation
a lot and works for many situations.
Upstream-ID: 783c3b53b9506db3e05daacfe34e0287eebb09d8
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu-z-systems/+bug/1777840/+subscriptions
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