Commit c9267aa8 authored by Alexei Starovoitov's avatar Alexei Starovoitov Committed by Martin KaFai Lau
Browse files

bpf: Fix bpf_strncmp proto. 



bpf_strncmp() doesn't write into its first argument.
Make sure that the verifier knows about it.

Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
Acked-by: default avatarDavid Vernet <void@manifault.com>
Link: https://lore.kernel.org/r/20230313235845.61029-2-alexei.starovoitov@gmail.com


Signed-off-by: default avatarMartin KaFai Lau <martin.lau@kernel.org>
parent b9fe8e8d

kernel/bpf/helpers.c

+1 −1
Original line number Diff line number Diff line
@@ -571,7 +571,7 @@ static const struct bpf_func_proto bpf_strncmp_proto = { 
	.func		= bpf_strncmp,

	.gpl_only	= false,

	.ret_type	= RET_INTEGER,

	.arg1_type	= ARG_PTR_TO_MEM,

	.arg1_type	= ARG_PTR_TO_MEM | MEM_RDONLY,

	.arg2_type	= ARG_CONST_SIZE,

	.arg3_type	= ARG_PTR_TO_CONST_STR,

};