** Changed in: linux (Ubuntu)
Importance: Undecided => High
** Changed in: linux (Ubuntu)
Status: New => In Progress
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Seth Forshee (sforshee)
** Description changed:
+ SRU Justification
+
+ Impact: On s390, an incorrect pointer being copied from the kernel to
+ userspace breaks stack unwinding.
+
+ Fix: One-line change from upstream. Only needed for 4.15+.
+
+ Test Case: The glibc testsuite contains test cases, which currently fail
+ with 4.15.
+
+ Regression Potential: Minimal as this is a small, obvious bug fix for as
+ single architecture.
+
+ ---
+
As pointed out in the glibc bug[1], there's a kernel bug preventing
unwinding due to an incorrect pointer being copied to userspace. A
1-line patch[2] has been committed to Linus's tree to fix this.
I investigated, and this only affects 4.15, so we only need this applied
to bionic.
[1] https://sourceware.org/bugzilla/show_bug.cgi?id=22916
[2]
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8b09ca746a643ca452cd41a522046a96ee5a55fd
** Description changed:
SRU Justification
Impact: On s390, an incorrect pointer being copied from the kernel to
userspace breaks stack unwinding.
Fix: One-line change from upstream. Only needed for 4.15+.
Test Case: The glibc testsuite contains test cases, which currently fail
with 4.15.
- Regression Potential: Minimal as this is a small, obvious bug fix for as
+ Regression Potential: Minimal as this is a small, obvious bug fix for a
single architecture.
---
As pointed out in the glibc bug[1], there's a kernel bug preventing
unwinding due to an incorrect pointer being copied to userspace. A
1-line patch[2] has been committed to Linus's tree to fix this.
I investigated, and this only affects 4.15, so we only need this applied
to bionic.
[1] https://sourceware.org/bugzilla/show_bug.cgi?id=22916
[2]
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8b09ca746a643ca452cd41a522046a96ee5a55fd
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https://bugs.launchpad.net/bugs/1765083
Title:
Please cherrypick s390 unwind fix
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