| Message ID | 20201116200113.2868539-1-kafai@fb.com |
|---|---|
| State | Superseded |
| Headers | show |
| Series | [bpf-next] bpf: Fix the irq and nmi check in bpf_sk_storage for tracing usage | expand |
Hello: This patch was applied to bpf/bpf-next.git (refs/heads/master): On Mon, 16 Nov 2020 12:01:13 -0800 you wrote: > The intention of the current check is to avoid using bpf_sk_storage > in irq and nmi. Jakub pointed out that the current check cannot > do that. For example, in_serving_softirq() returns true > if the softirq handling is interrupted by hard irq. > > Fixes: 8e4597c627fb ("bpf: Allow using bpf_sk_storage in FENTRY/FEXIT/RAW_TP") > Suggested-by: Jakub Kicinski <kuba@kernel.org> > Signed-off-by: Martin KaFai Lau <kafai@fb.com> > > [...] Here is the summary with links: - [bpf-next] bpf: Fix the irq and nmi check in bpf_sk_storage for tracing usage https://git.kernel.org/bpf/bpf-next/c/b93ef089d35c You are awesome, thank you! -- Deet-doot-dot, I am a bot. https://korg.docs.kernel.org/patchwork/pwbot.html
diff --git a/net/core/bpf_sk_storage.c b/net/core/bpf_sk_storage.c index 359908a7d3c1..a32037daa933 100644 --- a/net/core/bpf_sk_storage.c +++ b/net/core/bpf_sk_storage.c @@ -415,7 +415,7 @@ static bool bpf_sk_storage_tracing_allowed(const struct bpf_prog *prog) BPF_CALL_4(bpf_sk_storage_get_tracing, struct bpf_map *, map, struct sock *, sk, void *, value, u64, flags) { - if (!in_serving_softirq() && !in_task()) + if (in_irq() || in_nmi()) return (unsigned long)NULL; return (unsigned long)____bpf_sk_storage_get(map, sk, value, flags); @@ -424,7 +424,7 @@ BPF_CALL_4(bpf_sk_storage_get_tracing, struct bpf_map *, map, struct sock *, sk, BPF_CALL_2(bpf_sk_storage_delete_tracing, struct bpf_map *, map, struct sock *, sk) { - if (!in_serving_softirq() && !in_task()) + if (in_irq() || in_nmi()) return -EPERM; return ____bpf_sk_storage_delete(map, sk);
The intention of the current check is to avoid using bpf_sk_storage in irq and nmi. Jakub pointed out that the current check cannot do that. For example, in_serving_softirq() returns true if the softirq handling is interrupted by hard irq. Fixes: 8e4597c627fb ("bpf: Allow using bpf_sk_storage in FENTRY/FEXIT/RAW_TP") Suggested-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Martin KaFai Lau <kafai@fb.com> --- net/core/bpf_sk_storage.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)