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Commit 34d96152 authored by Daniel Colascione's avatar Daniel Colascione Committed by Greg Kroah-Hartman
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bpf: wait for running BPF programs when updating map-in-map



commit 1ae80cf31938c8f77c37a29bbe29e7f1cd492be8 upstream.

The map-in-map frequently serves as a mechanism for atomic
snapshotting of state that a BPF program might record.  The current
implementation is dangerous to use in this way, however, since
userspace has no way of knowing when all programs that might have
retrieved the "old" value of the map may have completed.

This change ensures that map update operations on map-in-map map types
always wait for all references to the old map to drop before returning
to userspace.

Signed-off-by: default avatarDaniel Colascione <dancol@google.com>
Reviewed-by: default avatarJoel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
Signed-off-by: default avatarChenbo Feng <fengc@google.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 9a7a80fb
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