From: McCabe, Robert J <robert.mccabe@rockwellcollins.com>
Date: Fri, 19 Apr 2019 23:37:20 +0000 (-0500)
Subject: libbpf: fix BPF_LOG_BUF_SIZE off-by-one error
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=4519efa6f8ea343e43ade21b0189b0b295439202;p=linux.git

libbpf: fix BPF_LOG_BUF_SIZE off-by-one error

The BPF_PROG_LOAD condition for kernel version <= 5.1 is

   log->len_total > UINT_MAX >> 8 /* (16 * 1024 * 1024) - 1 */

Signed-off-by: McCabe, Robert J <robert.mccabe@rockwellcollins.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
---

diff --git a/tools/lib/bpf/bpf.h b/tools/lib/bpf/bpf.h
index bc30783d14033..ff2506fe6bd2f 100644
--- a/tools/lib/bpf/bpf.h
+++ b/tools/lib/bpf/bpf.h
@@ -92,7 +92,7 @@ struct bpf_load_program_attr {
 #define MAPS_RELAX_COMPAT	0x01
 
 /* Recommend log buffer size */
-#define BPF_LOG_BUF_SIZE (16 * 1024 * 1024) /* verifier maximum in kernels <= 5.1 */
+#define BPF_LOG_BUF_SIZE (UINT32_MAX >> 8) /* verifier maximum in kernels <= 5.1 */
 LIBBPF_API int
 bpf_load_program_xattr(const struct bpf_load_program_attr *load_attr,
 		       char *log_buf, size_t log_buf_sz);