This bug was fixed in the package linux - 5.13.0-16.16
---------------
linux (5.13.0-16.16) impish; urgency=medium
* impish/linux: 5.13.0-16.16 -proposed tracker (LP: #1942611)
* Miscellaneous Ubuntu changes
- [Config] update toolchain in configs
* Miscellaneous upstream changes
- Revert "UBUNTU: [Config] Enable CONFIG_UBSAN_BOUNDS"
-- Andrea Righi <[email protected]> Fri, 03 Sep 2021 16:21:14
+0200
** Changed in: linux (Ubuntu Impish)
Status: In Progress => Fix Released
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https://bugs.launchpad.net/bugs/1935040
Title:
dev_forward_skb: do not scrub skb mark within the same name space
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Bionic:
Fix Released
Status in linux source package in Focal:
Fix Released
Status in linux source package in Hirsute:
Fix Released
Status in linux source package in Impish:
Fix Released
Bug description:
[Impact]
The ebpf function 'bpf_redirect' reset the mark when used with the flag
BPF_F_INGRESS.
There are two main problems with that:
- it's not consistent between legacy tunnels and ebpf;
- it's not consistent between ingress and egress.
In fact, the eBPF program can easily reset the mark, but it cannot
preserve it.
This kind of patch was already done in the past, see commit
963a88b31ddb ("tunnels: harmonize cleanup done on skb on xmit path"),
commit ea23192e8e57 ("tunnels: harmonize cleanup done on skb on rx
path") and commit 213dd74aee76 ("skbuff: Do not scrub skb mark within
the same name space").
This is fixed upstream with commit ff70202b2d1a ("dev_forward_skb: do
not scrub skb mark within the same name space").
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ff70202b2d1a
[Test Case]
Mark a packet in the POSTROUTING hook, redirect it to another
interface and display it with a netfilter log rule to check the mark.
[Regression Potential]
A user could expect that the mark is reset after a call to
bpf_redirect(BPF_F_INGRESS), but he could easily reset it in the eBPF
program himself.
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