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| author |   Wenbo Zhang <ethercflow@gmail.com> | 2020-07-10 05:20:35 -0400 |
|---|---|---|
| committer |   Daniel Borkmann <daniel@iogearbox.net> | 2020-07-10 23:25:25 +0200 |
| commit | eef8a42d6ce087d1c81c960ae0d14f955b742feb (patch) | |
| tree | cb2deede30a7bd2f068726f62d7678c319a62366 /samples | |
| parent | libbpf: Fix memory leak and optimize BTF sanitization (diff) | |
| download | wireguard-linux-eef8a42d6ce087d1c81c960ae0d14f955b742feb.tar.xz wireguard-linux-eef8a42d6ce087d1c81c960ae0d14f955b742feb.zip | |
bpf: Fix fds_example SIGSEGV error
The `BPF_LOG_BUF_SIZE`'s value is `UINT32_MAX >> 8`, so define an array
with it on stack caused an overflow.
Signed-off-by: Wenbo Zhang <ethercflow@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/20200710092035.28919-1-ethercflow@gmail.com
Diffstat (limited to 'samples')
| -rw-r--r-- | samples/bpf/fds_example.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/samples/bpf/fds_example.c b/samples/bpf/fds_example.c index d5992f787232..59f45fef5110 100644 --- a/samples/bpf/fds_example.c +++ b/samples/bpf/fds_example.c @@ -30,6 +30,8 @@ #define BPF_M_MAP 1 #define BPF_M_PROG 2 +char bpf_log_buf[BPF_LOG_BUF_SIZE]; + static void usage(void) { printf("Usage: fds_example [...]\n"); @@ -57,7 +59,6 @@ static int bpf_prog_create(const char *object) BPF_EXIT_INSN(), }; size_t insns_cnt = sizeof(insns) / sizeof(struct bpf_insn); - char bpf_log_buf[BPF_LOG_BUF_SIZE]; struct bpf_object *obj; int prog_fd; |