Re: [syzbot] Re: [syzbot] [block?] BUG: unable to handle kernel NULL pointer dereference in lo_rw_aio

[syzbot]

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Subject: Re: [syzbot] [block?] BUG: unable to handle kernel NULL pointer dereference in lo_rw_aio
Author: lizhi.xu@xxxxxxxxxxxxx

selinux policy not support read_iter

#syz test

diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c
index 47480eb2189b..2bf0d2b2f2ea 100644
--- a/security/selinux/selinuxfs.c
+++ b/security/selinux/selinuxfs.c
@@ -481,9 +481,15 @@ static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma)
 	return 0;
 }
 
+static ssize_t sel_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
+{
+	return 0;
+}
+
 static const struct file_operations sel_policy_ops = {
 	.open		= sel_open_policy,
 	.read		= sel_read_policy,
+	.read_iter	= sel_file_read_iter,
 	.mmap		= sel_mmap_policy,
 	.release	= sel_release_policy,
 	.llseek		= generic_file_llseek,