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Commit 4519efa6 authored by McCabe, Robert J's avatar McCabe, Robert J Committed by Alexei Starovoitov
Browse files

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: default avatarMcCabe, Robert J <robert.mccabe@rockwellcollins.com>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent 80695946

tools/lib/bpf/bpf.h

+1 −1
Original line number Diff line number Diff line
@@ -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);