diff options
| author | Wenbo Zhang <ethercflow@gmail.com> | 2020-07-10 05:20:35 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-08-19 08:16:03 +0200 |
| commit | 5908a17b247ddafe19470f7413c86f277ebe7195 (patch) | |
| tree | 5c095f0888f36ec6b11a464c6282a3dac43594ac /samples | |
| parent | 4360d9b560bde62984a202cd0f372306bbe8c638 (diff) | |
bpf: Fix fds_example SIGSEGV error
[ Upstream commit eef8a42d6ce087d1c81c960ae0d14f955b742feb ]
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
Signed-off-by: Sasha Levin <sashal@kernel.org>
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 2d4b717726b6..34b3fca788e8 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; |