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commit 02ca25fef2785974011e9c5beecc99b900b69fd7
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Author: Fabian Vogt <fvogt@suse.de>
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Date: Wed Jul 27 11:44:07 2022 +0200
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nscd: Fix netlink cache invalidation if epoll is used [BZ #29415]
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Processes cache network interface information such as whether IPv4 or IPv6
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are enabled. This is only checked again if the "netlink timestamp" provided
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by nscd changed, which is triggered by netlink socket activity.
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However, in the epoll handler for the netlink socket, it was missed to
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assign the new timestamp to the nscd database. The handler for plain poll
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did that properly, copy that over.
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This bug caused that e.g. processes which started before network
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configuration got unusuable addresses from getaddrinfo, like IPv6 only even
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though only IPv4 is available:
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https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/issues/1041
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It's a bit hard to reproduce, so I verified this by checking the timestamp
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on calls to __check_pf manually. Without this patch it's stuck at 1, now
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it's increasing on network changes as expected.
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Signed-off-by: Fabian Vogt <fvogt@suse.de>
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diff --git a/nscd/connections.c b/nscd/connections.c
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index 98182007646a33d5..19039bdbb210466a 100644
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--- a/nscd/connections.c
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+++ b/nscd/connections.c
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@@ -2286,7 +2286,8 @@ main_loop_epoll (int efd)
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sizeof (buf))) != -1)
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;
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- __bump_nl_timestamp ();
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+ dbs[hstdb].head->extra_data[NSCD_HST_IDX_CONF_TIMESTAMP]
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+ = __bump_nl_timestamp ();
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}
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# endif
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else
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