Hello:
This patch was applied to bpf/bpf.git (master) by Andrii Nakryiko andrii@kernel.org:
On Tue, 10 Dec 2024 17:32:13 +0100 you wrote:
Uprobes always use bpf_prog_run_array_uprobe() under tasks-trace-RCU protection. But it is possible to attach a non-sleepable BPF program to a uprobe, and non-sleepable BPF programs are freed via normal RCU (see __bpf_prog_put_noref()). This leads to UAF of the bpf_prog because a normal RCU grace period does not imply a tasks-trace-RCU grace period.
Fix it by explicitly waiting for a tasks-trace-RCU grace period after removing the attachment of a bpf_prog to a perf_event.
[...]
Here is the summary with links: - bpf: Fix UAF via mismatching bpf_prog/attachment RCU flavors https://git.kernel.org/bpf/bpf/c/ef1b808e3b7c
You are awesome, thank you!