tun: no longer rely on RTNL in tun_fill_info()

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Update tun_fill_info() to read device configuration fields (flags, owner,
group, numqueues, numdisabled) locklessly using READ_ONCE().

Annotate all writes to these fields in the control paths with WRITE_ONCE()
to prevent data races, as these fields can be modified concurrently via
ioctls (TUNSETPERSIST, TUNSETOWNER, TUNSETGROUP, TUNSETIFF) or queue
attaching/detaching.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20260706163517.2415530-1-edumazet@google.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

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This commit is contained in:

Eric Dumazet 2026-07-06 16:35:17 +00:00 • committed by Paolo Abeni

parent d5d7554052

commit 23dad2d088

2 changed files with 36 additions and 32 deletions

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60

drivers/net/tun.c

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8

drivers/net/tun_vnet.h

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