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authorDavid S. Miller <davem@davemloft.net>2019-06-15 18:19:47 -0700
committerDavid S. Miller <davem@davemloft.net>2019-06-15 18:19:47 -0700
commit1eb4169c1e6b3c95f3a99c2c7f91b10e6c98e848 (patch)
treebc9dd11610389aadebdc4e016d5035dff7aefaeb /net
parent5db2e7c7917f40236a021959893121c4e496f609 (diff)
parent9594dc3c7e71b9f52bee1d7852eb3d4e3aea9e99 (diff)
downloadlinux-1eb4169c1e6b3c95f3a99c2c7f91b10e6c98e848.tar.bz2
Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf
Alexei Starovoitov says: ==================== pull-request: bpf 2019-06-15 The following pull-request contains BPF updates for your *net* tree. The main changes are: 1) fix stack layout of JITed x64 bpf code, from Alexei. 2) fix out of bounds memory access in bpf_sk_storage, from Arthur. 3) fix lpm trie walk, from Jonathan. 4) fix nested bpf_perf_event_output, from Matt. 5) and several other fixes. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/core/bpf_sk_storage.c3
-rw-r--r--net/core/sock.c3
-rw-r--r--net/xdp/xdp_umem.c11
3 files changed, 11 insertions, 6 deletions
diff --git a/net/core/bpf_sk_storage.c b/net/core/bpf_sk_storage.c
index cc9597a87770..d1c4e1f3be2c 100644
--- a/net/core/bpf_sk_storage.c
+++ b/net/core/bpf_sk_storage.c
@@ -633,7 +633,8 @@ static struct bpf_map *bpf_sk_storage_map_alloc(union bpf_attr *attr)
return ERR_PTR(-ENOMEM);
bpf_map_init_from_attr(&smap->map, attr);
- smap->bucket_log = ilog2(roundup_pow_of_two(num_possible_cpus()));
+ /* Use at least 2 buckets, select_bucket() is undefined behavior with 1 bucket */
+ smap->bucket_log = max_t(u32, 1, ilog2(roundup_pow_of_two(num_possible_cpus())));
nbuckets = 1U << smap->bucket_log;
smap->buckets = kvcalloc(sizeof(*smap->buckets), nbuckets,
GFP_USER | __GFP_NOWARN);
diff --git a/net/core/sock.c b/net/core/sock.c
index 7f49392579a5..af09a23e4822 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1850,6 +1850,9 @@ struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
goto out;
}
RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL);
+#ifdef CONFIG_BPF_SYSCALL
+ RCU_INIT_POINTER(newsk->sk_bpf_storage, NULL);
+#endif
newsk->sk_err = 0;
newsk->sk_err_soft = 0;
diff --git a/net/xdp/xdp_umem.c b/net/xdp/xdp_umem.c
index 2b18223e7eb8..9c6de4f114f8 100644
--- a/net/xdp/xdp_umem.c
+++ b/net/xdp/xdp_umem.c
@@ -143,6 +143,9 @@ static void xdp_umem_clear_dev(struct xdp_umem *umem)
struct netdev_bpf bpf;
int err;
+ if (!umem->dev)
+ return;
+
if (umem->zc) {
bpf.command = XDP_SETUP_XSK_UMEM;
bpf.xsk.umem = NULL;
@@ -156,11 +159,9 @@ static void xdp_umem_clear_dev(struct xdp_umem *umem)
WARN(1, "failed to disable umem!\n");
}
- if (umem->dev) {
- rtnl_lock();
- xdp_clear_umem_at_qid(umem->dev, umem->queue_id);
- rtnl_unlock();
- }
+ rtnl_lock();
+ xdp_clear_umem_at_qid(umem->dev, umem->queue_id);
+ rtnl_unlock();
if (umem->zc) {
dev_put(umem->dev);