Re: [syzbot] [bpf?] KASAN: slab-out-of-bounds Read in btf_datasec_check_meta
From: Edward Adam Davis
Date: Mon Mar 11 2024 - 08:49:50 EST
please test oob in btf_datasec_check_meta
#syz test https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
index 170d017e8e4a..dda0aa0d7175 100644
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -816,6 +816,8 @@ static bool btf_name_valid_section(const struct btf *btf, u32 offset)
const char *src = btf_str_by_offset(btf, offset);
const char *src_limit;
+ if (!isprint(*src))
+ return false;
/* set a limit on identifier length */
src_limit = src + KSYM_NAME_LEN;
src++;