| 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-2021-47102: net: marvell: prestera: fix incorrect structure access |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| net: marvell: prestera: fix incorrect structure access |
| |
| In line: |
| upper = info->upper_dev; |
| We access upper_dev field, which is related only for particular events |
| (e.g. event == NETDEV_CHANGEUPPER). So, this line cause invalid memory |
| access for another events, |
| when ptr is not netdev_notifier_changeupper_info. |
| |
| The KASAN logs are as follows: |
| |
| [ 30.123165] BUG: KASAN: stack-out-of-bounds in prestera_netdev_port_event.constprop.0+0x68/0x538 [prestera] |
| [ 30.133336] Read of size 8 at addr ffff80000cf772b0 by task udevd/778 |
| [ 30.139866] |
| [ 30.141398] CPU: 0 PID: 778 Comm: udevd Not tainted 5.16.0-rc3 #6 |
| [ 30.147588] Hardware name: DNI AmazonGo1 A7040 board (DT) |
| [ 30.153056] Call trace: |
| [ 30.155547] dump_backtrace+0x0/0x2c0 |
| [ 30.159320] show_stack+0x18/0x30 |
| [ 30.162729] dump_stack_lvl+0x68/0x84 |
| [ 30.166491] print_address_description.constprop.0+0x74/0x2b8 |
| [ 30.172346] kasan_report+0x1e8/0x250 |
| [ 30.176102] __asan_load8+0x98/0xe0 |
| [ 30.179682] prestera_netdev_port_event.constprop.0+0x68/0x538 [prestera] |
| [ 30.186847] prestera_netdev_event_handler+0x1b4/0x1c0 [prestera] |
| [ 30.193313] raw_notifier_call_chain+0x74/0xa0 |
| [ 30.197860] call_netdevice_notifiers_info+0x68/0xc0 |
| [ 30.202924] register_netdevice+0x3cc/0x760 |
| [ 30.207190] register_netdev+0x24/0x50 |
| [ 30.211015] prestera_device_register+0x8a0/0xba0 [prestera] |
| |
| The Linux kernel CVE team has assigned CVE-2021-47102 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.14 with commit 3d5048cc54bd250cfbb358c37fcc011135977887 and fixed in 5.15.12 with commit 5c553a0cd1263e4da5f220d80fa713fc3959c1d0 |
| Issue introduced in 5.14 with commit 3d5048cc54bd250cfbb358c37fcc011135977887 and fixed in 5.16 with commit 2efc2256febf214e7b2bdaa21fe6c3c3146acdcb |
| |
| 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-2021-47102 |
| 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/ethernet/marvell/prestera/prestera_main.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/5c553a0cd1263e4da5f220d80fa713fc3959c1d0 |
| https://git.kernel.org/stable/c/2efc2256febf214e7b2bdaa21fe6c3c3146acdcb |
