** Also affects: lxc (Ubuntu Noble)
Importance: Undecided
Status: New
** Also affects: lxc (Ubuntu Oracular)
Importance: Undecided
Status: New
** Also affects: lxc (Ubuntu Plucky)
Importance: Undecided
Assignee: Sudip Mukherjee (sudipmuk)
Status: In Progress
** Changed in: lxc (Ubuntu Noble)
Status: New => In Progress
** Changed in: lxc (Ubuntu Oracular)
Status: New => In Progress
** Changed in: lxc (Ubuntu Noble)
Assignee: (unassigned) => Sudip Mukherjee (sudipmuk)
** Changed in: lxc (Ubuntu Oracular)
Assignee: (unassigned) => Sudip Mukherjee (sudipmuk)
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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to lxc in Ubuntu.
https://bugs.launchpad.net/bugs/2081762
Title:
lxc-excecute NULL pointer dereference causes segfault when sharing
rootfs with host
Status in lxc:
Fix Released
Status in lxc package in Ubuntu:
In Progress
Status in lxc source package in Noble:
In Progress
Status in lxc source package in Oracular:
In Progress
Status in lxc source package in Plucky:
In Progress
Status in lxc package in Debian:
New
Bug description:
lsb_release -rd:
Description: Ubuntu 24.04.1 LTS
Release: 24.04
lxc-start --version: 5.0.3
Issue: lxc-execute segfaults when using a shared host rootfs due to a
NULL pointer deference.
In lxc/src/lxc/conf.c - lines 339 - 344
The call to lxc_storage_prepare detects no rootfs path and returns
without calling storage_init
In lxc/src/lxc/conf.c - lines 293 - 310
leaving rootfs->storage null.
Then dereferencing rootfs->storage->type causes a segfault.
Steps to reproduce:
1. use lxc.conf:
lxc.uts.name=lxc-test-1
lxc.net.0.type = empty
lxc.console.path = none
lxc.tty.max = 1
lxc.pty.max = 128
lxc.mount.auto = proc:rw sys cgroup
lxc.autodev = 1
2. Run:
$ sudo lxc-execute -n lxc-test-1 -f lxc.conf -l TRACE -- ls /dev
Segmentation fault
I've attached a patch as a possible fix. Running the same example above with
the patch applied runs without crashing.
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https://bugs.launchpad.net/lxc/+bug/2081762/+subscriptions
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