From dcb40590e69e306030e944a39d0e4bf54247fb68 Mon Sep 17 00:00:00 2001 From: Roman Gushchin Date: Sat, 1 Dec 2018 10:39:44 -0800 Subject: [PATCH] bpf: refactor bpf_test_run() to separate own failures and test program result After commit f42ee093be29 ("bpf/test_run: support cgroup local storage") the bpf_test_run() function may fail with -ENOMEM, if it's not possible to allocate memory for a cgroup local storage. This error shouldn't be mixed with the return value of the testing program. Let's add an additional argument with a pointer where to store the testing program's result; and make bpf_test_run() return either 0 or -ENOMEM. Fixes: f42ee093be29 ("bpf/test_run: support cgroup local storage") Reported-by: Dan Carpenter Suggested-by: Alexei Starovoitov Signed-off-by: Roman Gushchin Cc: Daniel Borkmann Cc: Alexei Starovoitov Signed-off-by: Alexei Starovoitov --- net/bpf/test_run.c | 21 +++++++++++++++------ 1 file changed, 15 insertions(+), 6 deletions(-) diff --git a/net/bpf/test_run.c b/net/bpf/test_run.c index c89c22c49015..25001913d03b 100644 --- a/net/bpf/test_run.c +++ b/net/bpf/test_run.c @@ -28,12 +28,13 @@ static __always_inline u32 bpf_test_run_one(struct bpf_prog *prog, void *ctx, return ret; } -static u32 bpf_test_run(struct bpf_prog *prog, void *ctx, u32 repeat, u32 *time) +static int bpf_test_run(struct bpf_prog *prog, void *ctx, u32 repeat, u32 *ret, + u32 *time) { struct bpf_cgroup_storage *storage[MAX_BPF_CGROUP_STORAGE_TYPE] = { 0 }; enum bpf_cgroup_storage_type stype; u64 time_start, time_spent = 0; - u32 ret = 0, i; + u32 i; for_each_cgroup_storage_type(stype) { storage[stype] = bpf_cgroup_storage_alloc(prog, stype); @@ -49,7 +50,7 @@ static u32 bpf_test_run(struct bpf_prog *prog, void *ctx, u32 repeat, u32 *time) repeat = 1; time_start = ktime_get_ns(); for (i = 0; i < repeat; i++) { - ret = bpf_test_run_one(prog, ctx, storage); + *ret = bpf_test_run_one(prog, ctx, storage); if (need_resched()) { if (signal_pending(current)) break; @@ -65,7 +66,7 @@ static u32 bpf_test_run(struct bpf_prog *prog, void *ctx, u32 repeat, u32 *time) for_each_cgroup_storage_type(stype) bpf_cgroup_storage_free(storage[stype]); - return ret; + return 0; } static int bpf_test_finish(const union bpf_attr *kattr, @@ -165,7 +166,12 @@ int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr, __skb_push(skb, hh_len); if (is_direct_pkt_access) bpf_compute_data_pointers(skb); - retval = bpf_test_run(prog, skb, repeat, &duration); + ret = bpf_test_run(prog, skb, repeat, &retval, &duration); + if (ret) { + kfree_skb(skb); + kfree(sk); + return ret; + } if (!is_l2) { if (skb_headroom(skb) < hh_len) { int nhead = HH_DATA_ALIGN(hh_len - skb_headroom(skb)); @@ -212,11 +218,14 @@ int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr, rxqueue = __netif_get_rx_queue(current->nsproxy->net_ns->loopback_dev, 0); xdp.rxq = &rxqueue->xdp_rxq; - retval = bpf_test_run(prog, &xdp, repeat, &duration); + ret = bpf_test_run(prog, &xdp, repeat, &retval, &duration); + if (ret) + goto out; if (xdp.data != data + XDP_PACKET_HEADROOM + NET_IP_ALIGN || xdp.data_end != xdp.data + size) size = xdp.data_end - xdp.data; ret = bpf_test_finish(kattr, uattr, xdp.data, size, retval, duration); +out: kfree(data); return ret; }