kernel-5.4: backport fd16931a2f51 for chacha neon

Without this patch, the chacha block counter is not incremented on neon
rounds, resulting in incorrect calculations and corrupt packets.

This also switches to using `--no-numbered --zero-commit` so that future
diffs are smaller.

Reported-by: Hans Geiblinger <cybrnook2002@yahoo.com>
Reviewed-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
Cc: David Bauer <mail@david-bauer.net>
Cc: Petr Štetiar <ynezz@true.cz>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

1 files changed, 164 insertions, 0 deletions

diff --git a/target/linux/generic/backport-5.4/080-wireguard-0083-wireguard-allowedips-fix-use-after-free-in-root_remo.patch b/target/linux/generic/backport-5.4/080-wireguard-0083-wireguard-allowedips-fix-use-after-free-in-root_remo.patch
new file mode 100644
index 0000000000..e77ab5834a
--- /dev/null
+++ b/target/linux/generic/backport-5.4/080-wireguard-0083-wireguard-allowedips-fix-use-after-free-in-root_remo.patch
@@ -0,0 +1,164 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Eric Dumazet <edumazet@google.com>
+Date: Tue, 4 Feb 2020 22:17:25 +0100
+Subject: [PATCH] wireguard: allowedips: fix use-after-free in
+ root_remove_peer_lists
+
+commit 9981159fc3b677b357f84e069a11de5a5ec8a2a8 upstream.
+
+In the unlikely case a new node could not be allocated, we need to
+remove @newnode from @peer->allowedips_list before freeing it.
+
+syzbot reported:
+
+BUG: KASAN: use-after-free in __list_del_entry_valid+0xdc/0xf5 lib/list_debug.c:54
+Read of size 8 at addr ffff88809881a538 by task syz-executor.4/30133
+
+CPU: 0 PID: 30133 Comm: syz-executor.4 Not tainted 5.5.0-syzkaller #0
+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+0x197/0x210 lib/dump_stack.c:118
+ print_address_description.constprop.0.cold+0xd4/0x30b mm/kasan/report.c:374
+ __kasan_report.cold+0x1b/0x32 mm/kasan/report.c:506
+ kasan_report+0x12/0x20 mm/kasan/common.c:639
+ __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:135
+ __list_del_entry_valid+0xdc/0xf5 lib/list_debug.c:54
+ __list_del_entry include/linux/list.h:132 [inline]
+ list_del include/linux/list.h:146 [inline]
+ root_remove_peer_lists+0x24f/0x4b0 drivers/net/wireguard/allowedips.c:65
+ wg_allowedips_free+0x232/0x390 drivers/net/wireguard/allowedips.c:300
+ wg_peer_remove_all+0xd5/0x620 drivers/net/wireguard/peer.c:187
+ wg_set_device+0xd01/0x1350 drivers/net/wireguard/netlink.c:542
+ genl_family_rcv_msg_doit net/netlink/genetlink.c:672 [inline]
+ genl_family_rcv_msg net/netlink/genetlink.c:717 [inline]
+ genl_rcv_msg+0x67d/0xea0 net/netlink/genetlink.c:734
+ netlink_rcv_skb+0x177/0x450 net/netlink/af_netlink.c:2477
+ genl_rcv+0x29/0x40 net/netlink/genetlink.c:745
+ netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
+ netlink_unicast+0x59e/0x7e0 net/netlink/af_netlink.c:1328
+ netlink_sendmsg+0x91c/0xea0 net/netlink/af_netlink.c:1917
+ sock_sendmsg_nosec net/socket.c:652 [inline]
+ sock_sendmsg+0xd7/0x130 net/socket.c:672
+ ____sys_sendmsg+0x753/0x880 net/socket.c:2343
+ ___sys_sendmsg+0x100/0x170 net/socket.c:2397
+ __sys_sendmsg+0x105/0x1d0 net/socket.c:2430
+ __do_sys_sendmsg net/socket.c:2439 [inline]
+ __se_sys_sendmsg net/socket.c:2437 [inline]
+ __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2437
+ do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
+ entry_SYSCALL_64_after_hwframe+0x49/0xbe
+RIP: 0033:0x45b399
+Code: ad b6 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
+RSP: 002b:00007f99a9bcdc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
+RAX: ffffffffffffffda RBX: 00007f99a9bce6d4 RCX: 000000000045b399
+RDX: 0000000000000000 RSI: 0000000020001340 RDI: 0000000000000003
+RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
+R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004
+R13: 00000000000009ba R14: 00000000004cb2b8 R15: 0000000000000009
+
+Allocated by task 30103:
+ save_stack+0x23/0x90 mm/kasan/common.c:72
+ set_track mm/kasan/common.c:80 [inline]
+ __kasan_kmalloc mm/kasan/common.c:513 [inline]
+ __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:486
+ kasan_kmalloc+0x9/0x10 mm/kasan/common.c:527
+ kmem_cache_alloc_trace+0x158/0x790 mm/slab.c:3551
+ kmalloc include/linux/slab.h:556 [inline]
+ kzalloc include/linux/slab.h:670 [inline]
+ add+0x70a/0x1970 drivers/net/wireguard/allowedips.c:236
+ wg_allowedips_insert_v4+0xf6/0x160 drivers/net/wireguard/allowedips.c:320
+ set_allowedip drivers/net/wireguard/netlink.c:343 [inline]
+ set_peer+0xfb9/0x1150 drivers/net/wireguard/netlink.c:468
+ wg_set_device+0xbd4/0x1350 drivers/net/wireguard/netlink.c:591
+ genl_family_rcv_msg_doit net/netlink/genetlink.c:672 [inline]
+ genl_family_rcv_msg net/netlink/genetlink.c:717 [inline]
+ genl_rcv_msg+0x67d/0xea0 net/netlink/genetlink.c:734
+ netlink_rcv_skb+0x177/0x450 net/netlink/af_netlink.c:2477
+ genl_rcv+0x29/0x40 net/netlink/genetlink.c:745
+ netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
+ netlink_unicast+0x59e/0x7e0 net/netlink/af_netlink.c:1328
+ netlink_sendmsg+0x91c/0xea0 net/netlink/af_netlink.c:1917
+ sock_sendmsg_nosec net/socket.c:652 [inline]
+ sock_sendmsg+0xd7/0x130 net/socket.c:672
+ ____sys_sendmsg+0x753/0x880 net/socket.c:2343
+ ___sys_sendmsg+0x100/0x170 net/socket.c:2397
+ __sys_sendmsg+0x105/0x1d0 net/socket.c:2430
+ __do_sys_sendmsg net/socket.c:2439 [inline]
+ __se_sys_sendmsg net/socket.c:2437 [inline]
+ __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2437
+ do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
+ entry_SYSCALL_64_after_hwframe+0x49/0xbe
+
+Freed by task 30103:
+ save_stack+0x23/0x90 mm/kasan/common.c:72
+ set_track mm/kasan/common.c:80 [inline]
+ kasan_set_free_info mm/kasan/common.c:335 [inline]
+ __kasan_slab_free+0x102/0x150 mm/kasan/common.c:474
+ kasan_slab_free+0xe/0x10 mm/kasan/common.c:483
+ __cache_free mm/slab.c:3426 [inline]
+ kfree+0x10a/0x2c0 mm/slab.c:3757
+ add+0x12d2/0x1970 drivers/net/wireguard/allowedips.c:266
+ wg_allowedips_insert_v4+0xf6/0x160 drivers/net/wireguard/allowedips.c:320
+ set_allowedip drivers/net/wireguard/netlink.c:343 [inline]
+ set_peer+0xfb9/0x1150 drivers/net/wireguard/netlink.c:468
+ wg_set_device+0xbd4/0x1350 drivers/net/wireguard/netlink.c:591
+ genl_family_rcv_msg_doit net/netlink/genetlink.c:672 [inline]
+ genl_family_rcv_msg net/netlink/genetlink.c:717 [inline]
+ genl_rcv_msg+0x67d/0xea0 net/netlink/genetlink.c:734
+ netlink_rcv_skb+0x177/0x450 net/netlink/af_netlink.c:2477
+ genl_rcv+0x29/0x40 net/netlink/genetlink.c:745
+ netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
+ netlink_unicast+0x59e/0x7e0 net/netlink/af_netlink.c:1328
+ netlink_sendmsg+0x91c/0xea0 net/netlink/af_netlink.c:1917
+ sock_sendmsg_nosec net/socket.c:652 [inline]
+ sock_sendmsg+0xd7/0x130 net/socket.c:672
+ ____sys_sendmsg+0x753/0x880 net/socket.c:2343
+ ___sys_sendmsg+0x100/0x170 net/socket.c:2397
+ __sys_sendmsg+0x105/0x1d0 net/socket.c:2430
+ __do_sys_sendmsg net/socket.c:2439 [inline]
+ __se_sys_sendmsg net/socket.c:2437 [inline]
+ __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2437
+ do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
+ entry_SYSCALL_64_after_hwframe+0x49/0xbe
+
+The buggy address belongs to the object at ffff88809881a500
+ which belongs to the cache kmalloc-64 of size 64
+The buggy address is located 56 bytes inside of
+ 64-byte region [ffff88809881a500, ffff88809881a540)
+The buggy address belongs to the page:
+page:ffffea0002620680 refcount:1 mapcount:0 mapping:ffff8880aa400380 index:0x0
+raw: 00fffe0000000200 ffffea000250b748 ffffea000254bac8 ffff8880aa400380
+raw: 0000000000000000 ffff88809881a000 0000000100000020 0000000000000000
+page dumped because: kasan: bad access detected
+
+Memory state around the buggy address:
+ ffff88809881a400: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
+ ffff88809881a480: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
+>ffff88809881a500: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
+                                        ^
+ ffff88809881a580: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
+ ffff88809881a600: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc
+
+Fixes: e7096c131e51 ("net: WireGuard secure network tunnel")
+Signed-off-by: Eric Dumazet <edumazet@google.com>
+Reported-by: syzbot <syzkaller@googlegroups.com>
+Cc: Jason A. Donenfeld <Jason@zx2c4.com>
+Cc: wireguard@lists.zx2c4.com
+Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
+---
+ drivers/net/wireguard/allowedips.c | 1 +
+ 1 file changed, 1 insertion(+)
+
+--- a/drivers/net/wireguard/allowedips.c
++++ b/drivers/net/wireguard/allowedips.c
+@@ -263,6 +263,7 @@ static int add(struct allowedips_node __
+ 	} else {
+ 		node = kzalloc(sizeof(*node), GFP_KERNEL);
+ 		if (unlikely(!node)) {
++			list_del(&newnode->peer_list);
+ 			kfree(newnode);
+ 			return -ENOMEM;
+ 		}