From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org,
Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp>,
Jason Wang <jasowang@redhat.com>,
"David S. Miller" <davem@davemloft.net>
Subject: [PATCH 4.16 40/48] tun: Fix NULL pointer dereference in XDP redirect
Date: Sat, 9 Jun 2018 17:29:52 +0200 [thread overview]
Message-ID: <20180609145950.562127877@linuxfoundation.org> (raw)
In-Reply-To: <20180609145947.679103414@linuxfoundation.org>
4.16-stable review patch. If anyone has any objections, please let me know.
------------------
From: Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp>
[ Upstream commit 6547e387d7f52f2ba681a229de3c13e5b9e01ee1 ]
Calling XDP redirection requires bh disabled. Softirq can call another
XDP function and redirection functions, then the percpu static variable
ri->map can be overwritten to NULL.
This is a generic XDP case called from tun.
[ 3535.736058] BUG: unable to handle kernel NULL pointer dereference at 0000000000000018
[ 3535.743974] PGD 0 P4D 0
[ 3535.746530] Oops: 0000 [#1] SMP PTI
[ 3535.750049] Modules linked in: vhost_net vhost tap tun bridge stp llc ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter sunrpc vfat fat ext4 mbcache jbd2 intel_rapl skx_edac nfit libnvdimm x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm ipmi_ssif irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc ses aesni_intel crypto_simd cryptd enclosure hpwdt hpilo glue_helper ipmi_si pcspkr wmi mei_me ioatdma mei ipmi_devintf shpchp dca ipmi_msghandler lpc_ich acpi_power_meter sch_fq_codel ip_tables xfs libcrc32c sd_mod mgag200 i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops ttm drm smartpqi i40e crc32c_intel scsi_transport_sas tg3 i2c_core ptp pps_core
[ 3535.813456] CPU: 5 PID: 1630 Comm: vhost-1614 Not tainted 4.17.0-rc4 #2
[ 3535.820127] Hardware name: HPE ProLiant DL360 Gen10/ProLiant DL360 Gen10, BIOS U32 11/14/2017
[ 3535.828732] RIP: 0010:__xdp_map_lookup_elem+0x5/0x30
[ 3535.833740] RSP: 0018:ffffb4bc47bf7c58 EFLAGS: 00010246
[ 3535.839009] RAX: ffff9fdfcfea1c40 RBX: 0000000000000000 RCX: ffff9fdf27fe3100
[ 3535.846205] RDX: ffff9fdfca769200 RSI: 0000000000000000 RDI: 0000000000000000
[ 3535.853402] RBP: ffffb4bc491d9000 R08: 00000000000045ad R09: 0000000000000ec0
[ 3535.860597] R10: 0000000000000001 R11: ffff9fdf26c3ce4e R12: ffff9fdf9e72c000
[ 3535.867794] R13: 0000000000000000 R14: fffffffffffffff2 R15: ffff9fdfc82cdd00
[ 3535.874990] FS: 0000000000000000(0000) GS:ffff9fdfcfe80000(0000) knlGS:0000000000000000
[ 3535.883152] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 3535.888948] CR2: 0000000000000018 CR3: 0000000bde724004 CR4: 00000000007626e0
[ 3535.896145] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 3535.903342] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 3535.910538] PKRU: 55555554
[ 3535.913267] Call Trace:
[ 3535.915736] xdp_do_generic_redirect+0x7a/0x310
[ 3535.920310] do_xdp_generic.part.117+0x285/0x370
[ 3535.924970] tun_get_user+0x5b9/0x1260 [tun]
[ 3535.929279] tun_sendmsg+0x52/0x70 [tun]
[ 3535.933237] handle_tx+0x2ad/0x5f0 [vhost_net]
[ 3535.937721] vhost_worker+0xa5/0x100 [vhost]
[ 3535.942030] kthread+0xf5/0x130
[ 3535.945198] ? vhost_dev_ioctl+0x3b0/0x3b0 [vhost]
[ 3535.950031] ? kthread_bind+0x10/0x10
[ 3535.953727] ret_from_fork+0x35/0x40
[ 3535.957334] Code: 0e 74 15 83 f8 10 75 05 e9 49 aa b3 ff f3 c3 0f 1f 80 00 00 00 00 f3 c3 e9 29 9d b3 ff 66 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 <8b> 47 18 83 f8 0e 74 0d 83 f8 10 75 05 e9 49 a9 b3 ff 31 c0 c3
[ 3535.976387] RIP: __xdp_map_lookup_elem+0x5/0x30 RSP: ffffb4bc47bf7c58
[ 3535.982883] CR2: 0000000000000018
[ 3535.987096] ---[ end trace 383b299dd1430240 ]---
[ 3536.131325] Kernel panic - not syncing: Fatal exception
[ 3536.137484] Kernel Offset: 0x26a00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
[ 3536.281406] ---[ end Kernel panic - not syncing: Fatal exception ]---
And a kernel with generic case fixed still panics in tun driver XDP
redirect, because it disabled only preemption, but not bh.
[ 2055.128746] BUG: unable to handle kernel NULL pointer dereference at 0000000000000018
[ 2055.136662] PGD 0 P4D 0
[ 2055.139219] Oops: 0000 [#1] SMP PTI
[ 2055.142736] Modules linked in: vhost_net vhost tap tun bridge stp llc ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter sunrpc vfat fat ext4 mbcache jbd2 intel_rapl skx_edac nfit libnvdimm x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc ses aesni_intel ipmi_ssif crypto_simd enclosure cryptd hpwdt glue_helper ioatdma hpilo wmi dca pcspkr ipmi_si acpi_power_meter ipmi_devintf shpchp mei_me ipmi_msghandler mei lpc_ich sch_fq_codel ip_tables xfs libcrc32c sd_mod mgag200 i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops ttm drm i40e smartpqi tg3 scsi_transport_sas crc32c_intel i2c_core ptp pps_core
[ 2055.206142] CPU: 6 PID: 1693 Comm: vhost-1683 Tainted: G W 4.17.0-rc5-fix-tun+ #1
[ 2055.215011] Hardware name: HPE ProLiant DL360 Gen10/ProLiant DL360 Gen10, BIOS U32 11/14/2017
[ 2055.223617] RIP: 0010:__xdp_map_lookup_elem+0x5/0x30
[ 2055.228624] RSP: 0018:ffff998b07607cc0 EFLAGS: 00010246
[ 2055.233892] RAX: ffff8dbd8e235700 RBX: ffff8dbd8ff21c40 RCX: 0000000000000004
[ 2055.241089] RDX: ffff998b097a9000 RSI: 0000000000000000 RDI: 0000000000000000
[ 2055.248286] RBP: 0000000000000000 R08: 00000000000065a8 R09: 0000000000005d80
[ 2055.255483] R10: 0000000000000040 R11: ffff8dbcf0100000 R12: ffff998b097a9000
[ 2055.262681] R13: ffff8dbd8c98c000 R14: 0000000000000000 R15: ffff998b07607d78
[ 2055.269879] FS: 0000000000000000(0000) GS:ffff8dbd8ff00000(0000) knlGS:0000000000000000
[ 2055.278039] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 2055.283834] CR2: 0000000000000018 CR3: 0000000c0c8cc005 CR4: 00000000007626e0
[ 2055.291030] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 2055.298227] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 2055.305424] PKRU: 55555554
[ 2055.308153] Call Trace:
[ 2055.310624] xdp_do_redirect+0x7b/0x380
[ 2055.314499] tun_get_user+0x10fe/0x12a0 [tun]
[ 2055.318895] tun_sendmsg+0x52/0x70 [tun]
[ 2055.322852] handle_tx+0x2ad/0x5f0 [vhost_net]
[ 2055.327337] vhost_worker+0xa5/0x100 [vhost]
[ 2055.331646] kthread+0xf5/0x130
[ 2055.334813] ? vhost_dev_ioctl+0x3b0/0x3b0 [vhost]
[ 2055.339646] ? kthread_bind+0x10/0x10
[ 2055.343343] ret_from_fork+0x35/0x40
[ 2055.346950] Code: 0e 74 15 83 f8 10 75 05 e9 e9 aa b3 ff f3 c3 0f 1f 80 00 00 00 00 f3 c3 e9 c9 9d b3 ff 66 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 <8b> 47 18 83 f8 0e 74 0d 83 f8 10 75 05 e9 e9 a9 b3 ff 31 c0 c3
[ 2055.366004] RIP: __xdp_map_lookup_elem+0x5/0x30 RSP: ffff998b07607cc0
[ 2055.372500] CR2: 0000000000000018
[ 2055.375856] ---[ end trace 2a2dcc5e9e174268 ]---
[ 2055.523626] Kernel panic - not syncing: Fatal exception
[ 2055.529796] Kernel Offset: 0x2e000000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
[ 2055.677539] ---[ end Kernel panic - not syncing: Fatal exception ]---
v2:
- Removed preempt_disable/enable since local_bh_disable will prevent
preemption as well, feedback from Jason Wang.
Fixes: 761876c857cb ("tap: XDP support")
Signed-off-by: Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/tun.c | 15 +++++++++------
1 file changed, 9 insertions(+), 6 deletions(-)
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1632,7 +1632,7 @@ static struct sk_buff *tun_build_skb(str
else
*skb_xdp = 0;
- preempt_disable();
+ local_bh_disable();
rcu_read_lock();
xdp_prog = rcu_dereference(tun->xdp_prog);
if (xdp_prog && !*skb_xdp) {
@@ -1657,7 +1657,7 @@ static struct sk_buff *tun_build_skb(str
if (err)
goto err_redirect;
rcu_read_unlock();
- preempt_enable();
+ local_bh_enable();
return NULL;
case XDP_TX:
xdp_xmit = true;
@@ -1679,7 +1679,7 @@ static struct sk_buff *tun_build_skb(str
skb = build_skb(buf, buflen);
if (!skb) {
rcu_read_unlock();
- preempt_enable();
+ local_bh_enable();
return ERR_PTR(-ENOMEM);
}
@@ -1692,12 +1692,12 @@ static struct sk_buff *tun_build_skb(str
skb->dev = tun->dev;
generic_xdp_tx(skb, xdp_prog);
rcu_read_unlock();
- preempt_enable();
+ local_bh_enable();
return NULL;
}
rcu_read_unlock();
- preempt_enable();
+ local_bh_enable();
return skb;
@@ -1705,7 +1705,7 @@ err_redirect:
put_page(alloc_frag->page);
err_xdp:
rcu_read_unlock();
- preempt_enable();
+ local_bh_enable();
this_cpu_inc(tun->pcpu_stats->rx_dropped);
return NULL;
}
@@ -1901,16 +1901,19 @@ static ssize_t tun_get_user(struct tun_s
struct bpf_prog *xdp_prog;
int ret;
+ local_bh_disable();
rcu_read_lock();
xdp_prog = rcu_dereference(tun->xdp_prog);
if (xdp_prog) {
ret = do_xdp_generic(xdp_prog, skb);
if (ret != XDP_PASS) {
rcu_read_unlock();
+ local_bh_enable();
return total_len;
}
}
rcu_read_unlock();
+ local_bh_enable();
}
rcu_read_lock();
next prev parent reply other threads:[~2018-06-09 15:33 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-09 15:29 [PATCH 4.16 00/48] 4.16.15-stable review Greg Kroah-Hartman
2018-06-09 15:29 ` [PATCH 4.16 01/48] mmap: introduce sane default mmap limits Greg Kroah-Hartman
[not found] ` <CAMwc25rh7ZSO3mEFyTwbyh1qNy3k-5AHyRrRFq-Zih4kDDGsig@mail.gmail.com>
2018-06-11 5:26 ` Greg Kroah-Hartman
2018-06-09 15:29 ` [PATCH 4.16 02/48] mmap: relax file size limit for regular files Greg Kroah-Hartman
2018-06-09 15:29 ` [PATCH 4.16 03/48] netfilter: nf_flow_table: attach dst to skbs Greg Kroah-Hartman
2018-06-09 15:29 ` [PATCH 4.16 05/48] be2net: Fix error detection logic for BE3 Greg Kroah-Hartman
2018-06-09 15:29 ` [PATCH 4.16 06/48] bnx2x: use the right constant Greg Kroah-Hartman
2018-06-09 15:29 ` [PATCH 4.16 07/48] cls_flower: Fix incorrect idr release when failing to modify rule Greg Kroah-Hartman
2018-06-09 15:29 ` [PATCH 4.16 08/48] dccp: dont free ccid2_hc_tx_sock struct in dccp_disconnect() Greg Kroah-Hartman
2018-06-09 15:29 ` [PATCH 4.16 09/48] enic: set DMA mask to 47 bit Greg Kroah-Hartman
2018-06-09 15:29 ` [PATCH 4.16 10/48] ip6mr: only set ip6mr_table from setsockopt when ip6mr_new_table succeeds Greg Kroah-Hartman
2018-06-09 15:29 ` [PATCH 4.16 11/48] ip6_tunnel: remove magic mtu value 0xFFF8 Greg Kroah-Hartman
2018-06-09 15:29 ` [PATCH 4.16 12/48] ipmr: properly check rhltable_init() return value Greg Kroah-Hartman
2018-06-09 15:29 ` [PATCH 4.16 13/48] ipv4: remove warning in ip_recv_error Greg Kroah-Hartman
2018-06-09 15:29 ` [PATCH 4.16 14/48] ipv6: omit traffic class when calculating flow hash Greg Kroah-Hartman
2018-06-09 15:29 ` [PATCH 4.16 15/48] isdn: eicon: fix a missing-check bug Greg Kroah-Hartman
2018-06-09 15:29 ` [PATCH 4.16 16/48] kcm: Fix use-after-free caused by clonned sockets Greg Kroah-Hartman
2018-06-09 15:29 ` [PATCH 4.16 17/48] l2tp: fix refcount leakage on PPPoL2TP sockets Greg Kroah-Hartman
2018-06-09 15:29 ` [PATCH 4.16 18/48] mlxsw: spectrum: Forbid creation of VLAN 1 over port/LAG Greg Kroah-Hartman
2018-06-09 15:29 ` [PATCH 4.16 19/48] netdev-FAQ: clarify DaveMs position for stable backports Greg Kroah-Hartman
2018-06-09 15:29 ` [PATCH 4.16 20/48] net: ethernet: davinci_emac: fix error handling in probe() Greg Kroah-Hartman
2018-06-09 15:29 ` [PATCH 4.16 21/48] net: ipv4: add missing RTA_TABLE to rtm_ipv4_policy Greg Kroah-Hartman
2018-06-09 15:29 ` [PATCH 4.16 22/48] net: metrics: add proper netlink validation Greg Kroah-Hartman
2018-06-09 15:29 ` [PATCH 4.16 23/48] net/packet: refine check for priv area size Greg Kroah-Hartman
2018-06-09 15:29 ` [PATCH 4.16 24/48] net: phy: broadcom: Fix bcm_write_exp() Greg Kroah-Hartman
2018-06-09 15:29 ` [PATCH 4.16 26/48] packet: fix reserve calculation Greg Kroah-Hartman
2018-06-09 15:29 ` [PATCH 4.16 27/48] qed: Fix mask for physical address in ILT entry Greg Kroah-Hartman
2018-06-09 15:29 ` [PATCH 4.16 28/48] rtnetlink: validate attributes in do_setlink() Greg Kroah-Hartman
2018-06-09 15:29 ` [PATCH 4.16 29/48] sctp: not allow transport timeout value less than HZ/5 for hb_timer Greg Kroah-Hartman
2018-06-09 15:29 ` [PATCH 4.16 30/48] team: use netdev_features_t instead of u32 Greg Kroah-Hartman
2018-06-09 15:29 ` [PATCH 4.16 31/48] vhost: synchronize IOTLB message with dev cleanup Greg Kroah-Hartman
2018-06-09 15:29 ` [PATCH 4.16 32/48] vrf: check the original netdevice for generating redirect Greg Kroah-Hartman
2018-06-09 15:29 ` [PATCH 4.16 33/48] ipv6: sr: fix memory OOB access in seg6_do_srh_encap/inline Greg Kroah-Hartman
2018-06-09 15:29 ` [PATCH 4.16 34/48] net: phy: broadcom: Fix auxiliary control register reads Greg Kroah-Hartman
2018-06-09 15:29 ` [PATCH 4.16 35/48] net-sysfs: Fix memory leak in XPS configuration Greg Kroah-Hartman
2018-06-09 15:29 ` [PATCH 4.16 36/48] virtio-net: correctly transmit XDP buff after linearizing Greg Kroah-Hartman
2018-06-09 15:29 ` [PATCH 4.16 37/48] virtio-net: fix leaking page for gso packet during mergeable XDP Greg Kroah-Hartman
2018-06-09 15:29 ` [PATCH 4.16 38/48] net/mlx4: Fix irq-unsafe spinlock usage Greg Kroah-Hartman
2018-06-09 15:29 ` [PATCH 4.16 39/48] net/mlx5e: When RXFCS is set, add FCS data into checksum calculation Greg Kroah-Hartman
2018-06-09 15:29 ` Greg Kroah-Hartman [this message]
2018-06-09 15:29 ` [PATCH 4.16 41/48] virtio-net: correctly check num_buf during err path Greg Kroah-Hartman
2018-06-09 15:29 ` [PATCH 4.16 43/48] net : sched: cls_api: deal with egdev path only if needed Greg Kroah-Hartman
2018-06-09 15:29 ` [PATCH 4.16 44/48] virtio-net: correctly redirect linearized packet Greg Kroah-Hartman
2018-06-09 15:29 ` [PATCH 4.16 45/48] ip_tunnel: restore binding to ifaces with a large mtu Greg Kroah-Hartman
2018-06-09 15:29 ` [PATCH 4.16 46/48] net: netsec: reduce DMA mask to 40 bits Greg Kroah-Hartman
2018-06-09 15:29 ` [PATCH 4.16 47/48] vhost_net: flush batched heads before trying to busy polling Greg Kroah-Hartman
2018-06-09 15:30 ` [PATCH 4.16 48/48] PCI: hv: Do not wait forever on a device that has disappeared Greg Kroah-Hartman
2018-06-10 9:07 ` [PATCH 4.16 00/48] 4.16.15-stable review Naresh Kamboju
2018-06-10 14:05 ` Greg Kroah-Hartman
2018-06-10 17:04 ` Naresh Kamboju
2018-06-10 15:24 ` Guenter Roeck
2018-06-11 19:35 ` Shuah Khan
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