![Eric Dumazet](/assets/img/avatar_default.png)
syzbot found that ax25 routes where not properly protected against concurrent use [1]. In this particular report the bug happened while copying ax25->digipeat. Fix this problem by making sure we call ax25_get_route() while ax25_route_lock is held, so that no modification could happen while using the route. The current two ax25_get_route() callers do not sleep, so this change should be fine. Once we do that, ax25_get_route() no longer needs to grab a reference on the found route. [1] ax25_connect(): syz-executor0 uses autobind, please contact jreuter@yaina.de BUG: KASAN: use-after-free in memcpy include/linux/string.h:352 [inline] BUG: KASAN: use-after-free in kmemdup+0x42/0x60 mm/util.c:113 Read of size 66 at addr ffff888066641a80 by task syz-executor2/531 ax25_connect(): syz-executor0 uses autobind, please contact jreuter@yaina.de CPU: 1 PID: 531 Comm: syz-executor2 Not tainted 5.0.0-rc2+ #10 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1db/0x2d0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 check_memory_region_inline mm/kasan/generic.c:185 [inline] check_memory_region+0x123/0x190 mm/kasan/generic.c:191 memcpy+0x24/0x50 mm/kasan/common.c:130 memcpy include/linux/string.h:352 [inline] kmemdup+0x42/0x60 mm/util.c:113 kmemdup include/linux/string.h:425 [inline] ax25_rt_autobind+0x25d/0x750 net/ax25/ax25_route.c:424 ax25_connect.cold+0x30/0xa4 net/ax25/af_ax25.c:1224 __sys_connect+0x357/0x490 net/socket.c:1664 __do_sys_connect net/socket.c:1675 [inline] __se_sys_connect net/socket.c:1672 [inline] __x64_sys_connect+0x73/0xb0 net/socket.c:1672 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458099 Code: 6d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f870ee22c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458099 RDX: 0000000000000048 RSI: 0000000020000080 RDI: 0000000000000005 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 ax25_connect(): syz-executor4 uses autobind, please contact jreuter@yaina.de R10: 0000000000000000 R11: 0000000000000246 R12: 00007f870ee236d4 R13: 00000000004be48e R14: 00000000004ce9a8 R15: 00000000ffffffff Allocated by task 526: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_kmalloc mm/kasan/common.c:496 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:469 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:504 ax25_connect(): syz-executor5 uses autobind, please contact jreuter@yaina.de kmem_cache_alloc_trace+0x151/0x760 mm/slab.c:3609 kmalloc include/linux/slab.h:545 [inline] ax25_rt_add net/ax25/ax25_route.c:95 [inline] ax25_rt_ioctl+0x3b9/0x1270 net/ax25/ax25_route.c:233 ax25_ioctl+0x322/0x10b0 net/ax25/af_ax25.c:1763 sock_do_ioctl+0xe2/0x400 net/socket.c:950 sock_ioctl+0x32f/0x6c0 net/socket.c:1074 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0x107b/0x17d0 fs/ioctl.c:696 ksys_ioctl+0xab/0xd0 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe ax25_connect(): syz-executor5 uses autobind, please contact jreuter@yaina.de Freed by task 550: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:458 kasan_slab_free+0xe/0x10 mm/kasan/common.c:466 __cache_free mm/slab.c:3487 [inline] kfree+0xcf/0x230 mm/slab.c:3806 ax25_rt_add net/ax25/ax25_route.c:92 [inline] ax25_rt_ioctl+0x304/0x1270 net/ax25/ax25_route.c:233 ax25_ioctl+0x322/0x10b0 net/ax25/af_ax25.c:1763 sock_do_ioctl+0xe2/0x400 net/socket.c:950 sock_ioctl+0x32f/0x6c0 net/socket.c:1074 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0x107b/0x17d0 fs/ioctl.c:696 ksys_ioctl+0xab/0xd0 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff888066641a80 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 0 bytes inside of 96-byte region [ffff888066641a80, ffff888066641ae0) The buggy address belongs to the page: page:ffffea0001999040 count:1 mapcount:0 mapping:ffff88812c3f04c0 index:0x0 flags: 0x1fffc0000000200(slab) ax25_connect(): syz-executor4 uses autobind, please contact jreuter@yaina.de raw: 01fffc0000000200 ffffea0001817948 ffffea0002341dc8 ffff88812c3f04c0 raw: 0000000000000000 ffff888066641000 0000000100000020 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888066641980: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff888066641a00: 00 00 00 00 00 00 00 00 02 fc fc fc fc fc fc fc >ffff888066641a80: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff888066641b00: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff888066641b80: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Ralf Baechle <ralf@linux-mips.org> Reported-by: syzbot <syzkaller@googlegroups.com> Signed-off-by: David S. Miller <davem@davemloft.net>
489 lines
11 KiB
C
489 lines
11 KiB
C
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* Copyright (C) Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk)
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* Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
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* Copyright (C) Steven Whitehouse GW7RRM (stevew@acm.org)
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* Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de)
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* Copyright (C) Hans-Joachim Hetscher DD8NE (dd8ne@bnv-bamberg.de)
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* Copyright (C) Frederic Rible F1OAT (frible@teaser.fr)
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*/
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#include <linux/capability.h>
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/socket.h>
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#include <linux/timer.h>
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#include <linux/in.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/string.h>
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#include <linux/sockios.h>
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#include <linux/net.h>
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#include <linux/slab.h>
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#include <net/ax25.h>
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#include <linux/inet.h>
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#include <linux/netdevice.h>
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#include <linux/if_arp.h>
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#include <linux/skbuff.h>
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#include <linux/spinlock.h>
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#include <net/sock.h>
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#include <linux/uaccess.h>
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#include <linux/fcntl.h>
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#include <linux/mm.h>
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#include <linux/interrupt.h>
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#include <linux/init.h>
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#include <linux/seq_file.h>
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#include <linux/export.h>
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static ax25_route *ax25_route_list;
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DEFINE_RWLOCK(ax25_route_lock);
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void ax25_rt_device_down(struct net_device *dev)
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{
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ax25_route *s, *t, *ax25_rt;
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write_lock_bh(&ax25_route_lock);
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ax25_rt = ax25_route_list;
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while (ax25_rt != NULL) {
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s = ax25_rt;
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ax25_rt = ax25_rt->next;
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if (s->dev == dev) {
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if (ax25_route_list == s) {
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ax25_route_list = s->next;
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kfree(s->digipeat);
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kfree(s);
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} else {
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for (t = ax25_route_list; t != NULL; t = t->next) {
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if (t->next == s) {
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t->next = s->next;
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kfree(s->digipeat);
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kfree(s);
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break;
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}
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}
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}
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}
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}
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write_unlock_bh(&ax25_route_lock);
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}
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static int __must_check ax25_rt_add(struct ax25_routes_struct *route)
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{
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ax25_route *ax25_rt;
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ax25_dev *ax25_dev;
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int i;
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if ((ax25_dev = ax25_addr_ax25dev(&route->port_addr)) == NULL)
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return -EINVAL;
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if (route->digi_count > AX25_MAX_DIGIS)
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return -EINVAL;
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write_lock_bh(&ax25_route_lock);
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ax25_rt = ax25_route_list;
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while (ax25_rt != NULL) {
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if (ax25cmp(&ax25_rt->callsign, &route->dest_addr) == 0 &&
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ax25_rt->dev == ax25_dev->dev) {
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kfree(ax25_rt->digipeat);
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ax25_rt->digipeat = NULL;
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if (route->digi_count != 0) {
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if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
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write_unlock_bh(&ax25_route_lock);
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return -ENOMEM;
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}
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ax25_rt->digipeat->lastrepeat = -1;
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ax25_rt->digipeat->ndigi = route->digi_count;
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for (i = 0; i < route->digi_count; i++) {
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ax25_rt->digipeat->repeated[i] = 0;
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ax25_rt->digipeat->calls[i] = route->digi_addr[i];
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}
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}
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write_unlock_bh(&ax25_route_lock);
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return 0;
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}
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ax25_rt = ax25_rt->next;
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}
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if ((ax25_rt = kmalloc(sizeof(ax25_route), GFP_ATOMIC)) == NULL) {
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write_unlock_bh(&ax25_route_lock);
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return -ENOMEM;
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}
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refcount_set(&ax25_rt->refcount, 1);
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ax25_rt->callsign = route->dest_addr;
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ax25_rt->dev = ax25_dev->dev;
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ax25_rt->digipeat = NULL;
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ax25_rt->ip_mode = ' ';
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if (route->digi_count != 0) {
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if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
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write_unlock_bh(&ax25_route_lock);
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kfree(ax25_rt);
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return -ENOMEM;
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}
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ax25_rt->digipeat->lastrepeat = -1;
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ax25_rt->digipeat->ndigi = route->digi_count;
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for (i = 0; i < route->digi_count; i++) {
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ax25_rt->digipeat->repeated[i] = 0;
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ax25_rt->digipeat->calls[i] = route->digi_addr[i];
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}
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}
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ax25_rt->next = ax25_route_list;
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ax25_route_list = ax25_rt;
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write_unlock_bh(&ax25_route_lock);
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return 0;
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}
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void __ax25_put_route(ax25_route *ax25_rt)
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{
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kfree(ax25_rt->digipeat);
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kfree(ax25_rt);
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}
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static int ax25_rt_del(struct ax25_routes_struct *route)
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{
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ax25_route *s, *t, *ax25_rt;
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ax25_dev *ax25_dev;
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if ((ax25_dev = ax25_addr_ax25dev(&route->port_addr)) == NULL)
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return -EINVAL;
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write_lock_bh(&ax25_route_lock);
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ax25_rt = ax25_route_list;
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while (ax25_rt != NULL) {
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s = ax25_rt;
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ax25_rt = ax25_rt->next;
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if (s->dev == ax25_dev->dev &&
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ax25cmp(&route->dest_addr, &s->callsign) == 0) {
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if (ax25_route_list == s) {
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ax25_route_list = s->next;
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ax25_put_route(s);
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} else {
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for (t = ax25_route_list; t != NULL; t = t->next) {
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if (t->next == s) {
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t->next = s->next;
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ax25_put_route(s);
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break;
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}
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}
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}
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}
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}
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write_unlock_bh(&ax25_route_lock);
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return 0;
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}
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static int ax25_rt_opt(struct ax25_route_opt_struct *rt_option)
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{
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ax25_route *ax25_rt;
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ax25_dev *ax25_dev;
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int err = 0;
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if ((ax25_dev = ax25_addr_ax25dev(&rt_option->port_addr)) == NULL)
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return -EINVAL;
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write_lock_bh(&ax25_route_lock);
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ax25_rt = ax25_route_list;
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while (ax25_rt != NULL) {
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if (ax25_rt->dev == ax25_dev->dev &&
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ax25cmp(&rt_option->dest_addr, &ax25_rt->callsign) == 0) {
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switch (rt_option->cmd) {
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case AX25_SET_RT_IPMODE:
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switch (rt_option->arg) {
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case ' ':
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case 'D':
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case 'V':
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ax25_rt->ip_mode = rt_option->arg;
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break;
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default:
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err = -EINVAL;
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goto out;
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}
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break;
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default:
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err = -EINVAL;
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goto out;
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}
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}
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ax25_rt = ax25_rt->next;
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}
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out:
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write_unlock_bh(&ax25_route_lock);
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return err;
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}
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int ax25_rt_ioctl(unsigned int cmd, void __user *arg)
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{
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struct ax25_route_opt_struct rt_option;
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struct ax25_routes_struct route;
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switch (cmd) {
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case SIOCADDRT:
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if (copy_from_user(&route, arg, sizeof(route)))
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return -EFAULT;
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return ax25_rt_add(&route);
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case SIOCDELRT:
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if (copy_from_user(&route, arg, sizeof(route)))
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return -EFAULT;
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return ax25_rt_del(&route);
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case SIOCAX25OPTRT:
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if (copy_from_user(&rt_option, arg, sizeof(rt_option)))
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return -EFAULT;
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return ax25_rt_opt(&rt_option);
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default:
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return -EINVAL;
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}
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}
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#ifdef CONFIG_PROC_FS
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static void *ax25_rt_seq_start(struct seq_file *seq, loff_t *pos)
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__acquires(ax25_route_lock)
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{
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struct ax25_route *ax25_rt;
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int i = 1;
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read_lock(&ax25_route_lock);
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if (*pos == 0)
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return SEQ_START_TOKEN;
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for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) {
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if (i == *pos)
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return ax25_rt;
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++i;
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}
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return NULL;
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}
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static void *ax25_rt_seq_next(struct seq_file *seq, void *v, loff_t *pos)
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{
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++*pos;
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return (v == SEQ_START_TOKEN) ? ax25_route_list :
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((struct ax25_route *) v)->next;
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}
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static void ax25_rt_seq_stop(struct seq_file *seq, void *v)
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__releases(ax25_route_lock)
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{
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read_unlock(&ax25_route_lock);
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}
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static int ax25_rt_seq_show(struct seq_file *seq, void *v)
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{
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char buf[11];
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if (v == SEQ_START_TOKEN)
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seq_puts(seq, "callsign dev mode digipeaters\n");
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else {
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struct ax25_route *ax25_rt = v;
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const char *callsign;
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int i;
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if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0)
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callsign = "default";
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else
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callsign = ax2asc(buf, &ax25_rt->callsign);
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seq_printf(seq, "%-9s %-4s",
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callsign,
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ax25_rt->dev ? ax25_rt->dev->name : "???");
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switch (ax25_rt->ip_mode) {
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case 'V':
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seq_puts(seq, " vc");
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break;
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case 'D':
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seq_puts(seq, " dg");
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break;
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default:
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seq_puts(seq, " *");
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break;
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}
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if (ax25_rt->digipeat != NULL)
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for (i = 0; i < ax25_rt->digipeat->ndigi; i++)
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seq_printf(seq, " %s",
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ax2asc(buf, &ax25_rt->digipeat->calls[i]));
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seq_puts(seq, "\n");
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}
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return 0;
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}
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const struct seq_operations ax25_rt_seqops = {
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.start = ax25_rt_seq_start,
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.next = ax25_rt_seq_next,
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.stop = ax25_rt_seq_stop,
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.show = ax25_rt_seq_show,
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};
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#endif
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/*
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* Find AX.25 route
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*
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* Only routes with a reference count of zero can be destroyed.
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* Must be called with ax25_route_lock read locked.
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*/
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ax25_route *ax25_get_route(ax25_address *addr, struct net_device *dev)
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{
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ax25_route *ax25_spe_rt = NULL;
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ax25_route *ax25_def_rt = NULL;
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ax25_route *ax25_rt;
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/*
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* Bind to the physical interface we heard them on, or the default
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* route if none is found;
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*/
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for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) {
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if (dev == NULL) {
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if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev != NULL)
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ax25_spe_rt = ax25_rt;
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if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev != NULL)
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ax25_def_rt = ax25_rt;
|
|
} else {
|
|
if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev == dev)
|
|
ax25_spe_rt = ax25_rt;
|
|
if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev == dev)
|
|
ax25_def_rt = ax25_rt;
|
|
}
|
|
}
|
|
|
|
ax25_rt = ax25_def_rt;
|
|
if (ax25_spe_rt != NULL)
|
|
ax25_rt = ax25_spe_rt;
|
|
|
|
return ax25_rt;
|
|
}
|
|
|
|
/*
|
|
* Adjust path: If you specify a default route and want to connect
|
|
* a target on the digipeater path but w/o having a special route
|
|
* set before, the path has to be truncated from your target on.
|
|
*/
|
|
static inline void ax25_adjust_path(ax25_address *addr, ax25_digi *digipeat)
|
|
{
|
|
int k;
|
|
|
|
for (k = 0; k < digipeat->ndigi; k++) {
|
|
if (ax25cmp(addr, &digipeat->calls[k]) == 0)
|
|
break;
|
|
}
|
|
|
|
digipeat->ndigi = k;
|
|
}
|
|
|
|
|
|
/*
|
|
* Find which interface to use.
|
|
*/
|
|
int ax25_rt_autobind(ax25_cb *ax25, ax25_address *addr)
|
|
{
|
|
ax25_uid_assoc *user;
|
|
ax25_route *ax25_rt;
|
|
int err = 0;
|
|
|
|
ax25_route_lock_use();
|
|
ax25_rt = ax25_get_route(addr, NULL);
|
|
if (!ax25_rt) {
|
|
ax25_route_lock_unuse();
|
|
return -EHOSTUNREACH;
|
|
}
|
|
if ((ax25->ax25_dev = ax25_dev_ax25dev(ax25_rt->dev)) == NULL) {
|
|
err = -EHOSTUNREACH;
|
|
goto put;
|
|
}
|
|
|
|
user = ax25_findbyuid(current_euid());
|
|
if (user) {
|
|
ax25->source_addr = user->call;
|
|
ax25_uid_put(user);
|
|
} else {
|
|
if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) {
|
|
err = -EPERM;
|
|
goto put;
|
|
}
|
|
ax25->source_addr = *(ax25_address *)ax25->ax25_dev->dev->dev_addr;
|
|
}
|
|
|
|
if (ax25_rt->digipeat != NULL) {
|
|
ax25->digipeat = kmemdup(ax25_rt->digipeat, sizeof(ax25_digi),
|
|
GFP_ATOMIC);
|
|
if (ax25->digipeat == NULL) {
|
|
err = -ENOMEM;
|
|
goto put;
|
|
}
|
|
ax25_adjust_path(addr, ax25->digipeat);
|
|
}
|
|
|
|
if (ax25->sk != NULL) {
|
|
bh_lock_sock(ax25->sk);
|
|
sock_reset_flag(ax25->sk, SOCK_ZAPPED);
|
|
bh_unlock_sock(ax25->sk);
|
|
}
|
|
|
|
put:
|
|
ax25_route_lock_unuse();
|
|
return err;
|
|
}
|
|
|
|
struct sk_buff *ax25_rt_build_path(struct sk_buff *skb, ax25_address *src,
|
|
ax25_address *dest, ax25_digi *digi)
|
|
{
|
|
struct sk_buff *skbn;
|
|
unsigned char *bp;
|
|
int len;
|
|
|
|
len = digi->ndigi * AX25_ADDR_LEN;
|
|
|
|
if (skb_headroom(skb) < len) {
|
|
if ((skbn = skb_realloc_headroom(skb, len)) == NULL) {
|
|
printk(KERN_CRIT "AX.25: ax25_dg_build_path - out of memory\n");
|
|
return NULL;
|
|
}
|
|
|
|
if (skb->sk != NULL)
|
|
skb_set_owner_w(skbn, skb->sk);
|
|
|
|
consume_skb(skb);
|
|
|
|
skb = skbn;
|
|
}
|
|
|
|
bp = skb_push(skb, len);
|
|
|
|
ax25_addr_build(bp, src, dest, digi, AX25_COMMAND, AX25_MODULUS);
|
|
|
|
return skb;
|
|
}
|
|
|
|
/*
|
|
* Free all memory associated with routing structures.
|
|
*/
|
|
void __exit ax25_rt_free(void)
|
|
{
|
|
ax25_route *s, *ax25_rt = ax25_route_list;
|
|
|
|
write_lock_bh(&ax25_route_lock);
|
|
while (ax25_rt != NULL) {
|
|
s = ax25_rt;
|
|
ax25_rt = ax25_rt->next;
|
|
|
|
kfree(s->digipeat);
|
|
kfree(s);
|
|
}
|
|
write_unlock_bh(&ax25_route_lock);
|
|
}
|