[PATCH] vhost: fix OOB access for invalid vid
Maxime Coquelin
maxime.coquelin at redhat.com
Mon Mar 6 15:22:54 CET 2023
On 2/27/23 11:59, David Marchand wrote:
> The net/vhost pmd currently provides a -1 vid when disabling interrupt
> after a virtio port got disconnected.
>
> This can be caught when running with ASan.
>
> First, start dpdk-l3fwd-power in interrupt mode with a net/vhost port.
>
> $ ./build-clang/examples/dpdk-l3fwd-power -l0,1 --in-memory \
> -a 0000:00:00.0 \
> --vdev net_vhost0,iface=plop.sock,client=1\
> -- \
> -p 0x1 \
> --interrupt-only \
> --config '(0,0,1)' \
> --parse-ptype 0
>
> Then start testpmd with virtio-user.
>
> $ ./build-clang/app/dpdk-testpmd -l0,2 --single-file-segment --in-memory \
> -a 0000:00:00.0 \
> --vdev net_virtio_user0,path=plop.sock,server=1 \
> -- \
> -i
>
> Finally stop testpmd.
> ASan then splats in dpdk-l3fwd-power:
>
> =================================================================
> ==3641005==ERROR: AddressSanitizer: global-buffer-overflow on address
> 0x000005ed0778 at pc 0x000001270f81 bp 0x7fddbd2eee20
> sp 0x7fddbd2eee18
> READ of size 8 at 0x000005ed0778 thread T2
> #0 0x1270f80 in get_device .../lib/vhost/vhost.h:801:27
> #1 0x1270f80 in rte_vhost_get_vhost_vring .../lib/vhost/vhost.c:951:8
> #2 0x3ac95cb in eth_rxq_intr_disable
> .../drivers/net/vhost/rte_eth_vhost.c:647:8
> #3 0x170e0bf in rte_eth_dev_rx_intr_disable
> .../lib/ethdev/rte_ethdev.c:5443:25
> #4 0xf72ba7 in turn_on_off_intr .../examples/l3fwd-power/main.c:881:4
> #5 0xf71045 in main_intr_loop .../examples/l3fwd-power/main.c:1061:6
> #6 0x17f9292 in eal_thread_loop
> .../lib/eal/common/eal_common_thread.c:210:9
> #7 0x18373f5 in eal_worker_thread_loop .../lib/eal/linux/eal.c:915:2
> #8 0x7fddc16ae12c in start_thread (/lib64/libc.so.6+0x8b12c)
> (BuildId: 81daba31ee66dbd63efdc4252a872949d874d136)
> #9 0x7fddc172fbbf in __GI___clone3 (/lib64/libc.so.6+0x10cbbf)
> (BuildId: 81daba31ee66dbd63efdc4252a872949d874d136)
>
> 0x000005ed0778 is located 8 bytes to the left of global variable
> 'vhost_devices' defined in '.../lib/vhost/vhost.c:24'
> (0x5ed0780) of size 8192
> 0x000005ed0778 is located 20 bytes to the right of global variable
> 'vhost_config_log_level' defined in '.../lib/vhost/vhost.c:2174'
> (0x5ed0760) of size 4
> SUMMARY: AddressSanitizer: global-buffer-overflow
> .../lib/vhost/vhost.h:801:27 in get_device
> Shadow bytes around the buggy address:
> 0x000080bd2090: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
> 0x000080bd20a0: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
> 0x000080bd20b0: f9 f9 f9 f9 00 f9 f9 f9 00 f9 f9 f9 00 f9 f9 f9
> 0x000080bd20c0: 00 00 00 00 00 00 00 f9 f9 f9 f9 f9 04 f9 f9 f9
> 0x000080bd20d0: 00 00 00 00 00 f9 f9 f9 f9 f9 f9 f9 00 00 00 00
> =>0x000080bd20e0: 00 f9 f9 f9 f9 f9 f9 f9 04 f9 f9 f9 04 f9 f9[f9]
> 0x000080bd20f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 0x000080bd2100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 0x000080bd2110: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 0x000080bd2120: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 0x000080bd2130: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> Shadow byte legend (one shadow byte represents 8 application bytes):
> Addressable: 00
> Partially addressable: 01 02 03 04 05 06 07
> Heap left redzone: fa
> Freed heap region: fd
> Stack left redzone: f1
> Stack mid redzone: f2
> Stack right redzone: f3
> Stack after return: f5
> Stack use after scope: f8
> Global redzone: f9
> Global init order: f6
> Poisoned by user: f7
> Container overflow: fc
> Array cookie: ac
> Intra object redzone: bb
> ASan internal: fe
> Left alloca redzone: ca
> Right alloca redzone: cb
> Thread T2 created by T0 here:
> #0 0xe98996 in __interceptor_pthread_create
> (.examples/dpdk-l3fwd-power+0xe98996)
> (BuildId: d0b984a3b0287b9e0f301b73426fa921aeecca3a)
> #1 0x1836767 in eal_worker_thread_create .../lib/eal/linux/eal.c:952:6
> #2 0x1834b83 in rte_eal_init .../lib/eal/linux/eal.c:1257:9
> #3 0xf68902 in main .../examples/l3fwd-power/main.c:2496:8
> #4 0x7fddc164a50f in __libc_start_call_main (/lib64/libc.so.6+0x2750f)
> (BuildId: 81daba31ee66dbd63efdc4252a872949d874d136)
>
> ==3641005==ABORTING
>
> More generally, any application passing an incorrect vid would trigger
> such an OOB access.
>
> Cc: stable at dpdk.org
>
> Signed-off-by: David Marchand <david.marchand at redhat.com>
> ---
> Note: even after this patch, reconnecting the virtio-user port with
> dpdk-l3fwd-power in interrupt mode still seems broken, as the net/vhost
> pmd keeps complaining about an issue with rx interrupt fds.
>
> ---
> lib/vhost/vhost.h | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/lib/vhost/vhost.h b/lib/vhost/vhost.h
> index 5750f0c005..d9e97280fa 100644
> --- a/lib/vhost/vhost.h
> +++ b/lib/vhost/vhost.h
> @@ -798,7 +798,10 @@ hva_to_gpa(struct virtio_net *dev, uint64_t vva, uint64_t len)
> static __rte_always_inline struct virtio_net *
> get_device(int vid)
> {
> - struct virtio_net *dev = vhost_devices[vid];
> + struct virtio_net *dev = NULL;
> +
> + if (vid >= 0 && vid < RTE_MAX_VHOST_DEVICE)
> + dev = vhost_devices[vid];
>
> if (unlikely(!dev)) {
> VHOST_LOG_CONFIG("device", ERR, "(%d) device not found.\n", vid);
Applied to dpdk-next-virtio/main.
Thanks,
Maxime
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