| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2022-48651: ipvlan: Fix out-of-bound bugs caused by unset skb->mac_header |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| ipvlan: Fix out-of-bound bugs caused by unset skb->mac_header |
| |
| If an AF_PACKET socket is used to send packets through ipvlan and the |
| default xmit function of the AF_PACKET socket is changed from |
| dev_queue_xmit() to packet_direct_xmit() via setsockopt() with the option |
| name of PACKET_QDISC_BYPASS, the skb->mac_header may not be reset and |
| remains as the initial value of 65535, this may trigger slab-out-of-bounds |
| bugs as following: |
| |
| ================================================================= |
| UG: KASAN: slab-out-of-bounds in ipvlan_xmit_mode_l2+0xdb/0x330 [ipvlan] |
| PU: 2 PID: 1768 Comm: raw_send Kdump: loaded Not tainted 6.0.0-rc4+ #6 |
| ardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-1.fc33 |
| all Trace: |
| print_address_description.constprop.0+0x1d/0x160 |
| print_report.cold+0x4f/0x112 |
| kasan_report+0xa3/0x130 |
| ipvlan_xmit_mode_l2+0xdb/0x330 [ipvlan] |
| ipvlan_start_xmit+0x29/0xa0 [ipvlan] |
| __dev_direct_xmit+0x2e2/0x380 |
| packet_direct_xmit+0x22/0x60 |
| packet_snd+0x7c9/0xc40 |
| sock_sendmsg+0x9a/0xa0 |
| __sys_sendto+0x18a/0x230 |
| __x64_sys_sendto+0x74/0x90 |
| do_syscall_64+0x3b/0x90 |
| entry_SYSCALL_64_after_hwframe+0x63/0xcd |
| |
| The root cause is: |
| 1. packet_snd() only reset skb->mac_header when sock->type is SOCK_RAW |
| and skb->protocol is not specified as in packet_parse_headers() |
| |
| 2. packet_direct_xmit() doesn't reset skb->mac_header as dev_queue_xmit() |
| |
| In this case, skb->mac_header is 65535 when ipvlan_xmit_mode_l2() is |
| called. So when ipvlan_xmit_mode_l2() gets mac header with eth_hdr() which |
| use "skb->head + skb->mac_header", out-of-bound access occurs. |
| |
| This patch replaces eth_hdr() with skb_eth_hdr() in ipvlan_xmit_mode_l2() |
| and reset mac header in multicast to solve this out-of-bound bug. |
| |
| The Linux kernel CVE team has assigned CVE-2022-48651 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 3.19 with commit 2ad7bf3638411cb547f2823df08166c13ab04269 and fixed in 4.9.330 with commit e2b46cd5796f083e452fbc624f65b80328b0c1a4 |
| Issue introduced in 3.19 with commit 2ad7bf3638411cb547f2823df08166c13ab04269 and fixed in 4.14.295 with commit 25efdbe5fe542c3063d1948cc4e98abcb57621ca |
| Issue introduced in 3.19 with commit 2ad7bf3638411cb547f2823df08166c13ab04269 and fixed in 4.19.260 with commit bffcdade259c05ab3436b5fab711612093c275ef |
| Issue introduced in 3.19 with commit 2ad7bf3638411cb547f2823df08166c13ab04269 and fixed in 5.4.215 with commit 346e94aa4a99378592c46d6a34c72703a32bd5be |
| Issue introduced in 3.19 with commit 2ad7bf3638411cb547f2823df08166c13ab04269 and fixed in 5.10.146 with commit ab4a733874ead120691e8038272d22f8444d3638 |
| Issue introduced in 3.19 with commit 2ad7bf3638411cb547f2823df08166c13ab04269 and fixed in 5.15.71 with commit 8d06006c7eb75587d986da46c48ba9274f94e8e7 |
| Issue introduced in 3.19 with commit 2ad7bf3638411cb547f2823df08166c13ab04269 and fixed in 5.19.12 with commit b583e6b25bf9321c91154f6c78d2173ef12c4241 |
| Issue introduced in 3.19 with commit 2ad7bf3638411cb547f2823df08166c13ab04269 and fixed in 6.0 with commit 81225b2ea161af48e093f58e8dfee6d705b16af4 |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2022-48651 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| drivers/net/ipvlan/ipvlan_core.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/e2b46cd5796f083e452fbc624f65b80328b0c1a4 |
| https://git.kernel.org/stable/c/25efdbe5fe542c3063d1948cc4e98abcb57621ca |
| https://git.kernel.org/stable/c/bffcdade259c05ab3436b5fab711612093c275ef |
| https://git.kernel.org/stable/c/346e94aa4a99378592c46d6a34c72703a32bd5be |
| https://git.kernel.org/stable/c/ab4a733874ead120691e8038272d22f8444d3638 |
| https://git.kernel.org/stable/c/8d06006c7eb75587d986da46c48ba9274f94e8e7 |
| https://git.kernel.org/stable/c/b583e6b25bf9321c91154f6c78d2173ef12c4241 |
| https://git.kernel.org/stable/c/81225b2ea161af48e093f58e8dfee6d705b16af4 |
