Public bug reported:
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
** Affects: ubuntu-z-systems
Importance: High
Assignee: Canonical Kernel Team (canonical-kernel-team)
Status: Triaged
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: Skipper Bug Screeners (skipper-screen-team)
Status: New
** Tags: architecture-s39064 bugnameltc-169027 severity-high
targetmilestone-inin---
** Tags added: architecture-s39064 bugnameltc-169027 severity-high
targetmilestone-inin---
** Changed in: ubuntu
Assignee: (unassigned) => Skipper Bug Screeners (skipper-screen-team)
** Package changed: ubuntu => linux (Ubuntu)
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https://bugs.launchpad.net/bugs/1777840
Title:
uprobes: fix SIGSEGVs with setjmp/longjmp
Status in Ubuntu on IBM z Systems:
Triaged
Status in linux package in Ubuntu:
New
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
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