** No longer affects: gcc-9 (Ubuntu)
** No longer affects: gcc-9 (Ubuntu Eoan)
** No longer affects: gcc-9 (Ubuntu Focal)
** No longer affects: linux (Ubuntu Focal)
** No longer affects: linux (Ubuntu Eoan)
** No longer affects: linux (Ubuntu)
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This is my replacement "minimized" losetup.c that exhibits the problem.
Simply, drop this into klibc sources
and run:
./debian/rules build; sudo ./usr/utils/static/losetup
1 Argc before find_unused_loop_devices()
0 Argc after find_unused_loop_devices()
Argc values before and after did not match.
This bug was fixed in the package klibc - 2.0.7-1ubuntu1
---
klibc (2.0.7-1ubuntu1) focal; urgency=low
* Merge from Debian unstable. Remaining changes:
* Fix FTBFS on eoan and later with new gcc
- cf-protection.patch: Disable cf-protection for syscalls stub.
* save-arg
** Tags added: patch
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https://bugs.launchpad.net/bugs/1850184
Title:
losetup -f broken in 2.0.6-1ubuntu2
Status in gcc-9 package in Ubuntu:
New
Status in klibc package i
Ah-ha. If loop0 is in use, then the test-case appropriately fails in
both unstable and eoan, which is comforting, as I didn't look forward to
figuring out why this works in Debian (it doesn't).
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** Description changed:
[Impact]
- * sudo /usr/lib/klibc/bin/losetup -vf, which appears to be missbuilt, as
main(argc) is reset to zero, after ioctl() operations in a function call, quite
unexpectadly.
-
+ * sudo /usr/lib/klibc/bin/losetup -vf, which appears to be missbuilt,
+ as main(a
The testcase here doesn't seem to be working (or, rather, failing) for
me, which makes it harder to investigate this. It passes on both sid
and eoan for me:
(sid-amd64)root@nosferatu:~# dpkg -l \*klibc\*
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Hal
** Description changed:
+ [Impact]
+
+ * sudo /usr/lib/klibc/bin/losetup -vf, which appears to be missbuilt, as
main(argc) is reset to zero, after ioctl() operations in a function call, quite
unexpectadly.
+
+ [Test Case]
+
+ * sudo /usr/lib/klibc/bin/losetup -vf
+
+should not fail
** Patch added: "save-argc.patch"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1850184/+attachment/5301773/+files/save-argc.patch
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So, I'm not sure if this is a kernel headers/assembly bug (as ioctl is
used from there), gcc-9 bug, or the combination of the two.
I'm going to save argc, and use a saved copy for now, but this needs
deeper analysis. This sounds like a retpoline mitigation.
** Also affects: klibc (Ubuntu Focal)
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