Revision fff1662cc423be00c5a7dffc6cf2332161c882d6 authored by Tobias Klauser on 04 September 2020, 23:35:46 UTC, committed by Linus Torvalds on 05 September 2020, 19:14:29 UTC
Commit 32927393dc1c ("sysctl: pass kernel pointers to ->proc_handler") changed ctl_table.proc_handler to take a kernel pointer. Adjust the signature of proc_ipc_sem_dointvec to match ctl_table.proc_handler which fixes the following sparse error/warning: ipc/ipc_sysctl.c:94:47: warning: incorrect type in argument 3 (different address spaces) ipc/ipc_sysctl.c:94:47: expected void *buffer ipc/ipc_sysctl.c:94:47: got void [noderef] __user *buffer ipc/ipc_sysctl.c:194:35: warning: incorrect type in initializer (incompatible argument 3 (different address spaces)) ipc/ipc_sysctl.c:194:35: expected int ( [usertype] *proc_handler )( ... ) ipc/ipc_sysctl.c:194:35: got int ( * )( ... ) Fixes: 32927393dc1c ("sysctl: pass kernel pointers to ->proc_handler") Signed-off-by: Tobias Klauser <tklauser@distanz.ch> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: Christoph Hellwig <hch@lst.de> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Link: https://lkml.kernel.org/r/20200825105846.5193-1-tklauser@distanz.ch Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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test_blackhole_dev.c
// SPDX-License-Identifier: GPL-2.0
/*
* This module tests the blackhole_dev that is created during the
* net subsystem initialization. The test this module performs is
* by injecting an skb into the stack with skb->dev as the
* blackhole_dev and expects kernel to behave in a sane manner
* (in other words, *not crash*)!
*
* Copyright (c) 2018, Mahesh Bandewar <maheshb@google.com>
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/printk.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/udp.h>
#include <linux/ipv6.h>
#include <net/dst.h>
#define SKB_SIZE 256
#define HEAD_SIZE (14+40+8) /* Ether + IPv6 + UDP */
#define TAIL_SIZE 32 /* random tail-room */
#define UDP_PORT 1234
static int __init test_blackholedev_init(void)
{
struct ipv6hdr *ip6h;
struct sk_buff *skb;
struct ethhdr *ethh;
struct udphdr *uh;
int data_len;
int ret;
skb = alloc_skb(SKB_SIZE, GFP_KERNEL);
if (!skb)
return -ENOMEM;
/* Reserve head-room for the headers */
skb_reserve(skb, HEAD_SIZE);
/* Add data to the skb */
data_len = SKB_SIZE - (HEAD_SIZE + TAIL_SIZE);
memset(__skb_put(skb, data_len), 0xf, data_len);
/* Add protocol data */
/* (Transport) UDP */
uh = (struct udphdr *)skb_push(skb, sizeof(struct udphdr));
skb_set_transport_header(skb, 0);
uh->source = uh->dest = htons(UDP_PORT);
uh->len = htons(data_len);
uh->check = 0;
/* (Network) IPv6 */
ip6h = (struct ipv6hdr *)skb_push(skb, sizeof(struct ipv6hdr));
skb_set_network_header(skb, 0);
ip6h->hop_limit = 32;
ip6h->payload_len = data_len + sizeof(struct udphdr);
ip6h->nexthdr = IPPROTO_UDP;
ip6h->saddr = in6addr_loopback;
ip6h->daddr = in6addr_loopback;
/* Ether */
ethh = (struct ethhdr *)skb_push(skb, sizeof(struct ethhdr));
skb_set_mac_header(skb, 0);
skb->protocol = htons(ETH_P_IPV6);
skb->pkt_type = PACKET_HOST;
skb->dev = blackhole_netdev;
/* Now attempt to send the packet */
ret = dev_queue_xmit(skb);
switch (ret) {
case NET_XMIT_SUCCESS:
pr_warn("dev_queue_xmit() returned NET_XMIT_SUCCESS\n");
break;
case NET_XMIT_DROP:
pr_warn("dev_queue_xmit() returned NET_XMIT_DROP\n");
break;
case NET_XMIT_CN:
pr_warn("dev_queue_xmit() returned NET_XMIT_CN\n");
break;
default:
pr_err("dev_queue_xmit() returned UNKNOWN(%d)\n", ret);
}
return 0;
}
static void __exit test_blackholedev_exit(void)
{
pr_warn("test_blackholedev module terminating.\n");
}
module_init(test_blackholedev_init);
module_exit(test_blackholedev_exit);
MODULE_AUTHOR("Mahesh Bandewar <maheshb@google.com>");
MODULE_LICENSE("GPL");
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