linux-kernel - Re: [syzbot] [bpf?] KASAN: slab-out-of-bounds Read in btf_datasec_check

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Date: Mon, 11 Mar 2024 20:44:30 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+cc32304f6487ebff9b70@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [bpf?] KASAN: slab-out-of-bounds Read in btf_datasec_check_meta

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++;