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bpf: Fix fds_example SIGSEGV error

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[ 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>
This commit is contained in:
Wenbo Zhang 2020-07-10 05:20:35 -04:00 committed by Greg Kroah-Hartman
parent 4360d9b560
commit 5908a17b24
1 changed files with 2 additions and 1 deletions
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3
samples/bpf/fds_example.c
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@ -30,6 +30,8 @@
#define BPF_M_MAP 1 #define BPF_M_MAP 1
#define BPF_M_PROG 2 #define BPF_M_PROG 2
char bpf_log_buf[BPF_LOG_BUF_SIZE];
static void usage(void) static void usage(void)
{ {
printf("Usage: fds_example [...]\n"); printf("Usage: fds_example [...]\n");
@ -57,7 +59,6 @@ static int bpf_prog_create(const char *object)
BPF_EXIT_INSN(), BPF_EXIT_INSN(),
}; };
size_t insns_cnt = sizeof(insns) / sizeof(struct bpf_insn); size_t insns_cnt = sizeof(insns) / sizeof(struct bpf_insn);
char bpf_log_buf[BPF_LOG_BUF_SIZE];
struct bpf_object *obj; struct bpf_object *obj;
int prog_fd; int prog_fd;