** Changed in: linux (Ubuntu Bionic)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1830756
Title:
tuntap: correctly set SOCKWQ_ASYNC_NOSPACE
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Bionic:
Fix Committed
Bug description:
[SRU Justification]
== Impact ==
1bd4978a88ac2 ("tun: honor IFF_UP in tun_get_user()") which is part of
kernel v4.5 introduced an issue where userspace processes might not
get notified if a link comes up after initially being down. This was
fixed in the requested backport (from 4.17).
== Fix ==
Backport the requested patch to Bionic (4.15). Xenial (4.4) is not
affected and Disco and later already contain that fix.
== Risk of Regregression ==
The change only slightly modifies a very specific protocol function.
Risk should be low and limited to tuntap.
---
The upstream commit 2f3ab6221e4c ("tuntap: correctly set
SOCKWQ_ASYNC_NOSPACE") is missing.
Without this patch, userspace apps that use tuntap may be blocked.
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=2f3ab6221e4c
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