ipvs: fix racy memcpy in proc_do_sync_threshold

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[ Upstream commit 5310760af1 ]

When two threads run proc_do_sync_threshold() in parallel,
data races could happen between the two memcpy():

Thread-1			Thread-2
memcpy(val, valp, sizeof(val));
				memcpy(valp, val, sizeof(val));

This race might mess up the (struct ctl_table *) table->data,
so we add a mutex lock to serialize them.

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Link: https://lore.kernel.org/netdev/B6988E90-0A1E-4B85-BF26-2DAF6D482433@gmail.com/
Signed-off-by: Sishuai Gong <sishuai.system@gmail.com>
Acked-by: Simon Horman <horms@kernel.org>
Acked-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Sishuai Gong 2023-08-10 15:12:42 -04:00 • committed by Greg Kroah-Hartman

parent c050b4c998

commit 6650bebaa5

1 changed files with 4 additions and 0 deletions

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net/netfilter/ipvs/ip_vs_ctl.c

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