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aya-ebpf: document FExit ret kernel range #1584

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Merged
tamird merged 1 commit into from
May 26, 2026
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aya-ebpf: document FExit ret kernel range #1584

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9 changes: 5 additions & 4 deletions ebpf/aya-ebpf/src/programs/fexit.rs
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Expand Up @@ -83,10 +83,11 @@ impl FExitContext {
// changing runtime semantics.
//
// See also:
// https://github.com/torvalds/linux/commit/4621202adc5b
// fixes the forward propagation variant in v6.8.
// https://github.com/torvalds/linux/commit/4bf79f9be434
// fixes a related backtracking variant in v6.12.
// https://github.com/torvalds/linux/commit/d028f87517d6775dccff4ddbca2740826f9e53f1
// fixes this verifier bug by tracking BPF_JNE "not equal" constraints.
// https://github.com/torvalds/linux/commit/9e314f5d8682e1fe6ac214fb34580a238b6fd3c4
// is also a prerequisite, because it preserves 32/64-bit bounds
// across reg_set_min_max().
let err = core::hint::black_box(err);
if err == 0 {
Ok(T::from_register(ret_val))
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