[google/syzkaller] cd152e: executor: fix up /dev/net/tun before opening it

[Florent Revest]

Branch: refs/heads/gh-readonly-queue/master/pr-6838-e0f78d931aa9b1bb82117a1bd31e0583aef94708
Home: https://github.com/google/syzkaller
Commit: cd152ea2d27f130f30f3d744e27dc398a8c463ee
https://github.com/google/syzkaller/commit/cd152ea2d27f130f30f3d744e27dc398a8c463ee
Author: Florent Revest <rev...@chromium.org>
Date: 2026-02-26 (Thu, 26 Feb 2026)

Changed paths:
M executor/common_linux.h

Log Message:
-----------
executor: fix up /dev/net/tun before opening it

We get various reports like: "SYZFAIL: tun: can't open /dev/net/tun":
https://syzkaller.appspot.com/bug?extid=17b76f12c4893fc7b67b

or like "SYZFAIL: tun: ioctl(TUNSETIFF) failed"
https://syzkaller.appspot.com/bug?extid=49461b4cd5aa62f553fc

Which look a lot like syzkaller manages to delete or replace
/dev/net/tun and from there on consistently fail to open the device and
complains with these SYZFAIL.

This is an attempt to fix up the /dev/net/tun before we open it so we
know we try to open the right file.



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[Florent Revest]

Branch: refs/heads/master