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05 April 2024, 19:05:47 UTC
Revision ceb56070359b7329b5678b5d95a376fcb24767be authored by Daniel Borkmann on 27 June 2016, 19:38:11 UTC, committed by David S. Miller on 29 June 2016, 09:42:55 UTC 
bpf, perf: delay release of BPF prog after grace period
 
Commit dead9f29ddcc ("perf: Fix race in BPF program unregister") moved
destruction of BPF program from free_event_rcu() callback to __free_event(),
which is problematic if used with tail calls: if prog A is attached as
trace event directly, but at the same time present in a tail call map used
by another trace event program elsewhere, then we need to delay destruction
via RCU grace period since it can still be in use by the program doing the
tail call (the prog first needs to be dropped from the tail call map, then
trace event with prog A attached destroyed, so we get immediate destruction).

Fixes: dead9f29ddcc ("perf: Fix race in BPF program unregister")
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Cc: Jann Horn <jann@thejh.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
1 parent 565ce8f
History
Tip revision: ceb56070359b7329b5678b5d95a376fcb24767be authored by Daniel Borkmann on 27 June 2016, 19:38:11 UTC
bpf, perf: delay release of BPF prog after grace period
Tip revision: ceb5607
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