linux-kernel - Re: [syzbot] [bpf?] UBSAN: array-index-out-of-bounds in check_stack_range

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Date: Wed, 20 Mar 2024 17:40:06 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+33f4297b5f927648741a@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [bpf?] UBSAN: array-index-out-of-bounds in check_stack_range_initialized

please test oob in check_stack_range_initialized

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git master


diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 1dd3b99d1bb9..ed0878f4373a 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -7177,6 +7177,11 @@ static int check_stack_range_initialized(
 		return 0;
 	}
 
+	if (INT_MIN - access_size > max_off) {
+		verbose(env, "invalid access size\n");
+		return -EACCES;
+	}
+
 	for (i = min_off; i < max_off + access_size; i++) {
 		u8 *stype;