[syzbot] [netfilter?] KMSAN: uninit-value in ip6table_mangle_hook (3)
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syzbot
Nov 22, 2024, 9:42:31 AM11/22/24
to core...@netfilter.org, da...@davemloft.net, dsa...@kernel.org, edum...@google.com, ho...@kernel.org, kad...@netfilter.org, ku...@kernel.org, linux-...@vger.kernel.org, net...@vger.kernel.org, netfilt...@vger.kernel.org, pab...@redhat.com, pa...@netfilter.org, syzkall...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 2e1b3cc9d7f7 Merge tag 'arm-fixes-6.12-2' of git://git.ker..
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=105e0d87980000
kernel config: https://syzkaller.appspot.com/x/.config?x=6fdf74cce377223b
dashboard link: https://syzkaller.appspot.com/bug?extid=6023ea32e206eef7920a
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=165d5d5f980000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=145e0d87980000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/08456e37db58/disk-2e1b3cc9.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/cc957f7ba80b/vmlinux-2e1b3cc9.xz
kernel image: https://storage.googleapis.com/syzbot-assets/7579fe72ed89/bzImage-2e1b3cc9.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6023ea...@syzkaller.appspotmail.com
=====================================================
BUG: KMSAN: uninit-value in ip6t_mangle_out net/ipv6/netfilter/ip6table_mangle.c:56 [inline]
BUG: KMSAN: uninit-value in ip6table_mangle_hook+0x97d/0x9c0 net/ipv6/netfilter/ip6table_mangle.c:72
ip6t_mangle_out net/ipv6/netfilter/ip6table_mangle.c:56 [inline]
ip6table_mangle_hook+0x97d/0x9c0 net/ipv6/netfilter/ip6table_mangle.c:72
nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]
nf_hook_slow+0xf4/0x400 net/netfilter/core.c:626
nf_hook include/linux/netfilter.h:269 [inline]
__ip6_local_out+0x5ac/0x640 net/ipv6/output_core.c:143
ip6_local_out+0x4c/0x210 net/ipv6/output_core.c:153
ip6tunnel_xmit+0x129/0x460 include/net/ip6_tunnel.h:161
ip6_tnl_xmit+0x341a/0x3860 net/ipv6/ip6_tunnel.c:1281
__gre6_xmit+0x14b9/0x1550 net/ipv6/ip6_gre.c:815
ip6gre_xmit_ipv4 net/ipv6/ip6_gre.c:839 [inline]
ip6gre_tunnel_xmit+0x18f7/0x2030 net/ipv6/ip6_gre.c:922
__netdev_start_xmit include/linux/netdevice.h:4928 [inline]
netdev_start_xmit include/linux/netdevice.h:4937 [inline]
xmit_one net/core/dev.c:3588 [inline]
dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3604
sch_direct_xmit+0x399/0xd40 net/sched/sch_generic.c:343
__dev_xmit_skb net/core/dev.c:3825 [inline]
__dev_queue_xmit+0x2fcf/0x56d0 net/core/dev.c:4398
dev_queue_xmit include/linux/netdevice.h:3094 [inline]
packet_xmit+0x9c/0x6c0 net/packet/af_packet.c:276
packet_snd net/packet/af_packet.c:3145 [inline]
packet_sendmsg+0x908b/0xa370 net/packet/af_packet.c:3177
sock_sendmsg_nosec net/socket.c:729 [inline]
__sock_sendmsg+0x30f/0x380 net/socket.c:744
__sys_sendto+0x645/0x7f0 net/socket.c:2214
__do_sys_sendto net/socket.c:2226 [inline]
__se_sys_sendto net/socket.c:2222 [inline]
__x64_sys_sendto+0x125/0x1d0 net/socket.c:2222
x64_sys_call+0x3373/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:45
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Uninit was stored to memory at:
ip6_tnl_xmit+0x34f7/0x3860 net/ipv6/ip6_tunnel.c:1277
__gre6_xmit+0x14b9/0x1550 net/ipv6/ip6_gre.c:815
ip6gre_xmit_ipv4 net/ipv6/ip6_gre.c:839 [inline]
ip6gre_tunnel_xmit+0x18f7/0x2030 net/ipv6/ip6_gre.c:922
__netdev_start_xmit include/linux/netdevice.h:4928 [inline]
netdev_start_xmit include/linux/netdevice.h:4937 [inline]
xmit_one net/core/dev.c:3588 [inline]
dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3604
sch_direct_xmit+0x399/0xd40 net/sched/sch_generic.c:343
__dev_xmit_skb net/core/dev.c:3825 [inline]
__dev_queue_xmit+0x2fcf/0x56d0 net/core/dev.c:4398
dev_queue_xmit include/linux/netdevice.h:3094 [inline]
packet_xmit+0x9c/0x6c0 net/packet/af_packet.c:276
packet_snd net/packet/af_packet.c:3145 [inline]
packet_sendmsg+0x908b/0xa370 net/packet/af_packet.c:3177
sock_sendmsg_nosec net/socket.c:729 [inline]
__sock_sendmsg+0x30f/0x380 net/socket.c:744
__sys_sendto+0x645/0x7f0 net/socket.c:2214
__do_sys_sendto net/socket.c:2226 [inline]
__se_sys_sendto net/socket.c:2222 [inline]
__x64_sys_sendto+0x125/0x1d0 net/socket.c:2222
x64_sys_call+0x3373/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:45
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Uninit was created at:
slab_post_alloc_hook mm/slub.c:4091 [inline]
slab_alloc_node mm/slub.c:4134 [inline]
__do_kmalloc_node mm/slub.c:4263 [inline]
__kmalloc_node_track_caller_noprof+0x6c7/0xf90 mm/slub.c:4283
kmalloc_reserve+0x23e/0x4a0 net/core/skbuff.c:609
pskb_expand_head+0x226/0x1a60 net/core/skbuff.c:2275
skb_realloc_headroom+0x140/0x2b0 net/core/skbuff.c:2355
ip6_tnl_xmit+0x2106/0x3860 net/ipv6/ip6_tunnel.c:1227
__gre6_xmit+0x14b9/0x1550 net/ipv6/ip6_gre.c:815
ip6gre_xmit_ipv4 net/ipv6/ip6_gre.c:839 [inline]
ip6gre_tunnel_xmit+0x18f7/0x2030 net/ipv6/ip6_gre.c:922
__netdev_start_xmit include/linux/netdevice.h:4928 [inline]
netdev_start_xmit include/linux/netdevice.h:4937 [inline]
xmit_one net/core/dev.c:3588 [inline]
dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3604
sch_direct_xmit+0x399/0xd40 net/sched/sch_generic.c:343
__dev_xmit_skb net/core/dev.c:3825 [inline]
__dev_queue_xmit+0x2fcf/0x56d0 net/core/dev.c:4398
dev_queue_xmit include/linux/netdevice.h:3094 [inline]
packet_xmit+0x9c/0x6c0 net/packet/af_packet.c:276
packet_snd net/packet/af_packet.c:3145 [inline]
packet_sendmsg+0x908b/0xa370 net/packet/af_packet.c:3177
sock_sendmsg_nosec net/socket.c:729 [inline]
__sock_sendmsg+0x30f/0x380 net/socket.c:744
__sys_sendto+0x645/0x7f0 net/socket.c:2214
__do_sys_sendto net/socket.c:2226 [inline]
__se_sys_sendto net/socket.c:2222 [inline]
__x64_sys_sendto+0x125/0x1d0 net/socket.c:2222
x64_sys_call+0x3373/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:45
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
CPU: 1 UID: 0 PID: 5819 Comm: syz-executor359 Not tainted 6.12.0-rc6-syzkaller-00077-g2e1b3cc9d7f7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
=====================================================
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
syzbot found the following issue on:
HEAD commit: 2e1b3cc9d7f7 Merge tag 'arm-fixes-6.12-2' of git://git.ker..
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=105e0d87980000
kernel config: https://syzkaller.appspot.com/x/.config?x=6fdf74cce377223b
dashboard link: https://syzkaller.appspot.com/bug?extid=6023ea32e206eef7920a
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=165d5d5f980000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=145e0d87980000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/08456e37db58/disk-2e1b3cc9.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/cc957f7ba80b/vmlinux-2e1b3cc9.xz
kernel image: https://storage.googleapis.com/syzbot-assets/7579fe72ed89/bzImage-2e1b3cc9.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6023ea...@syzkaller.appspotmail.com
=====================================================
BUG: KMSAN: uninit-value in ip6t_mangle_out net/ipv6/netfilter/ip6table_mangle.c:56 [inline]
BUG: KMSAN: uninit-value in ip6table_mangle_hook+0x97d/0x9c0 net/ipv6/netfilter/ip6table_mangle.c:72
ip6t_mangle_out net/ipv6/netfilter/ip6table_mangle.c:56 [inline]
ip6table_mangle_hook+0x97d/0x9c0 net/ipv6/netfilter/ip6table_mangle.c:72
nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]
nf_hook_slow+0xf4/0x400 net/netfilter/core.c:626
nf_hook include/linux/netfilter.h:269 [inline]
__ip6_local_out+0x5ac/0x640 net/ipv6/output_core.c:143
ip6_local_out+0x4c/0x210 net/ipv6/output_core.c:153
ip6tunnel_xmit+0x129/0x460 include/net/ip6_tunnel.h:161
ip6_tnl_xmit+0x341a/0x3860 net/ipv6/ip6_tunnel.c:1281
__gre6_xmit+0x14b9/0x1550 net/ipv6/ip6_gre.c:815
ip6gre_xmit_ipv4 net/ipv6/ip6_gre.c:839 [inline]
ip6gre_tunnel_xmit+0x18f7/0x2030 net/ipv6/ip6_gre.c:922
__netdev_start_xmit include/linux/netdevice.h:4928 [inline]
netdev_start_xmit include/linux/netdevice.h:4937 [inline]
xmit_one net/core/dev.c:3588 [inline]
dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3604
sch_direct_xmit+0x399/0xd40 net/sched/sch_generic.c:343
__dev_xmit_skb net/core/dev.c:3825 [inline]
__dev_queue_xmit+0x2fcf/0x56d0 net/core/dev.c:4398
dev_queue_xmit include/linux/netdevice.h:3094 [inline]
packet_xmit+0x9c/0x6c0 net/packet/af_packet.c:276
packet_snd net/packet/af_packet.c:3145 [inline]
packet_sendmsg+0x908b/0xa370 net/packet/af_packet.c:3177
sock_sendmsg_nosec net/socket.c:729 [inline]
__sock_sendmsg+0x30f/0x380 net/socket.c:744
__sys_sendto+0x645/0x7f0 net/socket.c:2214
__do_sys_sendto net/socket.c:2226 [inline]
__se_sys_sendto net/socket.c:2222 [inline]
__x64_sys_sendto+0x125/0x1d0 net/socket.c:2222
x64_sys_call+0x3373/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:45
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Uninit was stored to memory at:
ip6_tnl_xmit+0x34f7/0x3860 net/ipv6/ip6_tunnel.c:1277
__gre6_xmit+0x14b9/0x1550 net/ipv6/ip6_gre.c:815
ip6gre_xmit_ipv4 net/ipv6/ip6_gre.c:839 [inline]
ip6gre_tunnel_xmit+0x18f7/0x2030 net/ipv6/ip6_gre.c:922
__netdev_start_xmit include/linux/netdevice.h:4928 [inline]
netdev_start_xmit include/linux/netdevice.h:4937 [inline]
xmit_one net/core/dev.c:3588 [inline]
dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3604
sch_direct_xmit+0x399/0xd40 net/sched/sch_generic.c:343
__dev_xmit_skb net/core/dev.c:3825 [inline]
__dev_queue_xmit+0x2fcf/0x56d0 net/core/dev.c:4398
dev_queue_xmit include/linux/netdevice.h:3094 [inline]
packet_xmit+0x9c/0x6c0 net/packet/af_packet.c:276
packet_snd net/packet/af_packet.c:3145 [inline]
packet_sendmsg+0x908b/0xa370 net/packet/af_packet.c:3177
sock_sendmsg_nosec net/socket.c:729 [inline]
__sock_sendmsg+0x30f/0x380 net/socket.c:744
__sys_sendto+0x645/0x7f0 net/socket.c:2214
__do_sys_sendto net/socket.c:2226 [inline]
__se_sys_sendto net/socket.c:2222 [inline]
__x64_sys_sendto+0x125/0x1d0 net/socket.c:2222
x64_sys_call+0x3373/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:45
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Uninit was created at:
slab_post_alloc_hook mm/slub.c:4091 [inline]
slab_alloc_node mm/slub.c:4134 [inline]
__do_kmalloc_node mm/slub.c:4263 [inline]
__kmalloc_node_track_caller_noprof+0x6c7/0xf90 mm/slub.c:4283
kmalloc_reserve+0x23e/0x4a0 net/core/skbuff.c:609
pskb_expand_head+0x226/0x1a60 net/core/skbuff.c:2275
skb_realloc_headroom+0x140/0x2b0 net/core/skbuff.c:2355
ip6_tnl_xmit+0x2106/0x3860 net/ipv6/ip6_tunnel.c:1227
__gre6_xmit+0x14b9/0x1550 net/ipv6/ip6_gre.c:815
ip6gre_xmit_ipv4 net/ipv6/ip6_gre.c:839 [inline]
ip6gre_tunnel_xmit+0x18f7/0x2030 net/ipv6/ip6_gre.c:922
__netdev_start_xmit include/linux/netdevice.h:4928 [inline]
netdev_start_xmit include/linux/netdevice.h:4937 [inline]
xmit_one net/core/dev.c:3588 [inline]
dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3604
sch_direct_xmit+0x399/0xd40 net/sched/sch_generic.c:343
__dev_xmit_skb net/core/dev.c:3825 [inline]
__dev_queue_xmit+0x2fcf/0x56d0 net/core/dev.c:4398
dev_queue_xmit include/linux/netdevice.h:3094 [inline]
packet_xmit+0x9c/0x6c0 net/packet/af_packet.c:276
packet_snd net/packet/af_packet.c:3145 [inline]
packet_sendmsg+0x908b/0xa370 net/packet/af_packet.c:3177
sock_sendmsg_nosec net/socket.c:729 [inline]
__sock_sendmsg+0x30f/0x380 net/socket.c:744
__sys_sendto+0x645/0x7f0 net/socket.c:2214
__do_sys_sendto net/socket.c:2226 [inline]
__se_sys_sendto net/socket.c:2222 [inline]
__x64_sys_sendto+0x125/0x1d0 net/socket.c:2222
x64_sys_call+0x3373/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:45
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
CPU: 1 UID: 0 PID: 5819 Comm: syz-executor359 Not tainted 6.12.0-rc6-syzkaller-00077-g2e1b3cc9d7f7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
=====================================================
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
syzbot
Dec 3, 2024, 8:28:56 AM12/3/24
to linux-...@vger.kernel.org, syzkall...@googlegroups.com
For archival purposes, forwarding an incoming command email to
linux-...@vger.kernel.org, syzkall...@googlegroups.com.
***
Subject: Re: KMSAN: uninit-value in ip6table_mangle_hook()
Author: dman...@yandex.ru
#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git cdd30ebb1b9f36159d66f088b61aee264e649d7a
diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index 48fd53b98972..00840249554a 100644
--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -1224,7 +1224,9 @@ int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield,
(skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
struct sk_buff *new_skb;
- new_skb = skb_realloc_headroom(skb, max_headroom);
+ new_skb = skb_copy_expand(skb, max_headroom,
+ skb_tailroom(skb),
+ GFP_ATOMIC);
if (!new_skb)
goto tx_err_dst_release;
linux-...@vger.kernel.org, syzkall...@googlegroups.com.
***
Subject: Re: KMSAN: uninit-value in ip6table_mangle_hook()
Author: dman...@yandex.ru
#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git cdd30ebb1b9f36159d66f088b61aee264e649d7a
diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index 48fd53b98972..00840249554a 100644
--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -1224,7 +1224,9 @@ int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield,
(skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
struct sk_buff *new_skb;
- new_skb = skb_realloc_headroom(skb, max_headroom);
+ new_skb = skb_copy_expand(skb, max_headroom,
+ skb_tailroom(skb),
+ GFP_ATOMIC);
if (!new_skb)
goto tx_err_dst_release;
syzbot
Dec 3, 2024, 10:28:18 AM12/3/24
to linux-...@vger.kernel.org, syzkall...@googlegroups.com
For archival purposes, forwarding an incoming command email to
linux-...@vger.kernel.org, syzkall...@googlegroups.com.
***
Subject: Re: KMSAN: uninit-value in ip6table_mangle_hook()
Author: dman...@yandex.ru
#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git cdd30ebb1b9f36159d66f088b61aee264e649d7a
diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index 48fd53b98972..0d4a213ce145 100644
linux-...@vger.kernel.org, syzkall...@googlegroups.com.
***
Subject: Re: KMSAN: uninit-value in ip6table_mangle_hook()
Author: dman...@yandex.ru
#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git cdd30ebb1b9f36159d66f088b61aee264e649d7a
diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -1098,7 +1098,7 @@ int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield,
unsigned int max_headroom = psh_hlen;
__be16 payload_protocol;
bool use_cache = false;
- u8 hop_limit;
+ u8 hop_limit = 0;
int err = -1;
payload_protocol = skb_protocol(skb, true);
syzbot
Dec 14, 2024, 5:16:32 PM12/14/24
to linux-...@vger.kernel.org, syzkall...@googlegroups.com
For archival purposes, forwarding an incoming command email to
linux-...@vger.kernel.org, syzkall...@googlegroups.com.
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Subject:
Author: ma...@getstate.dev
linux-...@vger.kernel.org, syzkall...@googlegroups.com.
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#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
syzbot
Dec 14, 2024, 5:21:35 PM12/14/24
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syzbot
Dec 14, 2024, 9:34:08 PM12/14/24
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