net: synchronize proc_do_rss_key() with netdev_rss_key_fill()

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proc_do_rss_key() reads netdev_rss_key[] without synchronization, so a
concurrent reader of /proc/sys/net/core/netdev_rss_key can observe a
partially populated key while netdev_rss_key_fill() is initializing it.

Publish a boolean flag after an smp_wmb() once netdev_rss_key_fill() has
populated netdev_rss_key[], and pair it with an smp_rmb() in
proc_do_rss_key(), printing zero bytes until the flag is set.

Fixes: 960fb622f8 ("net: provide a per host RSS key generic infrastructure")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20260922163458.3900996-2-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Eric Dumazet 2026-09-22 16:34:55 +00:00 • committed by Jakub Kicinski

parent 42a9fb3382

commit 9396e37c48

3 changed files with 14 additions and 1 deletions

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1

net/core/dev.h

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7

net/core/sysctl_net_core.c

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7

net/ethtool/ioctl.c

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