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net: filter: let unattached filters use sock_fprog_kern

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The sk_unattached_filter_create() API is used by BPF filters that
are not directly attached or related to sockets, and are used in
team, ptp, xt_bpf, cls_bpf, etc. As such all users do their own
internal managment of obtaining filter blocks and thus already
have them in kernel memory and set up before calling into
sk_unattached_filter_create(). As a result, due to __user annotation
in sock_fprog, sparse triggers false positives (incorrect type in
assignment [different address space]) when filters are set up before
passing them to sk_unattached_filter_create(). Therefore, let
sk_unattached_filter_create() API use sock_fprog_kern to overcome
this issue.

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Acked-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Borkmann
2014-05-23 18:43:58 +02:00
committed by David S. Miller
parent 8556ce79d5
commit b1fcd35cf5
9 changed files with 18 additions and 17 deletions
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2
lib/test_bpf.c
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@@ -1472,7 +1472,7 @@ static int run_one(struct sk_filter *fp, struct bpf_test *t)
static __init int test_bpf(void)
{
struct sk_filter *fp, *fp_ext = NULL;
struct sock_fprog fprog;
struct sock_fprog_kern fprog;
int err, i, err_cnt = 0;
for (i = 0; i < ARRAY_SIZE(tests); i++) {