Re: [PATCH] bpf: Fix UAF via mismatching bpf_prog/attachment RCU flavors

Hello:

This patch was applied to bpf/bpf.git (master)
by Andrii Nakryiko [off-list ref]:

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!
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