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authorAlexei Starovoitov <ast@fb.com>2016-11-22 16:52:08 -0800
committerDavid S. Miller <davem@davemloft.net>2016-11-24 16:04:52 -0500
commitd2b024d32d6e6f704633a8a474bd883cf9e25254 (patch)
tree94f9aacde15016c8541a2da9067d751db4ca9c71 /samples
parente3f42f8453902d1520dcdc9909731f274c6d52c1 (diff)
downloadlinux-stericsson-d2b024d32d6e6f704633a8a474bd883cf9e25254.tar.gz
samples/bpf: fix sockex2 example
since llvm commit "Do not expand UNDEF SDNode during insn selection lowering" llvm will generate code that uses uninitialized registers for cases where C code is actually uses uninitialized data. So this sockex2 example is technically broken. Fix it by initializing on the stack variable fully. Also increase verifier buffer limit, since verifier output may not fit in 64k for this sockex2 code depending on llvm version. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'samples')
-rw-r--r--samples/bpf/libbpf.h2
-rw-r--r--samples/bpf/sockex2_kern.c2
2 files changed, 2 insertions, 2 deletions
diff --git a/samples/bpf/libbpf.h b/samples/bpf/libbpf.h
index ac6edb61b64a..de96a935068d 100644
--- a/samples/bpf/libbpf.h
+++ b/samples/bpf/libbpf.h
@@ -18,7 +18,7 @@ int bpf_prog_load(enum bpf_prog_type prog_type,
int bpf_obj_pin(int fd, const char *pathname);
int bpf_obj_get(const char *pathname);
-#define LOG_BUF_SIZE 65536
+#define LOG_BUF_SIZE (256 * 1024)
extern char bpf_log_buf[LOG_BUF_SIZE];
/* ALU ops on registers, bpf_add|sub|...: dst_reg += src_reg */
diff --git a/samples/bpf/sockex2_kern.c b/samples/bpf/sockex2_kern.c
index 44e5846c988f..f58acfc92556 100644
--- a/samples/bpf/sockex2_kern.c
+++ b/samples/bpf/sockex2_kern.c
@@ -198,7 +198,7 @@ struct bpf_map_def SEC("maps") hash_map = {
SEC("socket2")
int bpf_prog2(struct __sk_buff *skb)
{
- struct bpf_flow_keys flow;
+ struct bpf_flow_keys flow = {};
struct pair *value;
u32 key;