| 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-2022-48878: Bluetooth: hci_qca: Fix driver shutdown on closed serdev |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| Bluetooth: hci_qca: Fix driver shutdown on closed serdev |
| |
| The driver shutdown callback (which sends EDL_SOC_RESET to the device |
| over serdev) should not be invoked when HCI device is not open (e.g. if |
| hci_dev_open_sync() failed), because the serdev and its TTY are not open |
| either. Also skip this step if device is powered off |
| (qca_power_shutdown()). |
| |
| The shutdown callback causes use-after-free during system reboot with |
| Qualcomm Atheros Bluetooth: |
| |
| Unable to handle kernel paging request at virtual address |
| 0072662f67726fd7 |
| ... |
| CPU: 6 PID: 1 Comm: systemd-shutdow Tainted: G W |
| 6.1.0-rt5-00325-g8a5f56bcfcca #8 |
| Hardware name: Qualcomm Technologies, Inc. Robotics RB5 (DT) |
| Call trace: |
| tty_driver_flush_buffer+0x4/0x30 |
| serdev_device_write_flush+0x24/0x34 |
| qca_serdev_shutdown+0x80/0x130 [hci_uart] |
| device_shutdown+0x15c/0x260 |
| kernel_restart+0x48/0xac |
| |
| KASAN report: |
| |
| BUG: KASAN: use-after-free in tty_driver_flush_buffer+0x1c/0x50 |
| Read of size 8 at addr ffff16270c2e0018 by task systemd-shutdow/1 |
| |
| CPU: 7 PID: 1 Comm: systemd-shutdow Not tainted |
| 6.1.0-next-20221220-00014-gb85aaf97fb01-dirty #28 |
| Hardware name: Qualcomm Technologies, Inc. Robotics RB5 (DT) |
| Call trace: |
| dump_backtrace.part.0+0xdc/0xf0 |
| show_stack+0x18/0x30 |
| dump_stack_lvl+0x68/0x84 |
| print_report+0x188/0x488 |
| kasan_report+0xa4/0xf0 |
| __asan_load8+0x80/0xac |
| tty_driver_flush_buffer+0x1c/0x50 |
| ttyport_write_flush+0x34/0x44 |
| serdev_device_write_flush+0x48/0x60 |
| qca_serdev_shutdown+0x124/0x274 |
| device_shutdown+0x1e8/0x350 |
| kernel_restart+0x48/0xb0 |
| __do_sys_reboot+0x244/0x2d0 |
| __arm64_sys_reboot+0x54/0x70 |
| invoke_syscall+0x60/0x190 |
| el0_svc_common.constprop.0+0x7c/0x160 |
| do_el0_svc+0x44/0xf0 |
| el0_svc+0x2c/0x6c |
| el0t_64_sync_handler+0xbc/0x140 |
| el0t_64_sync+0x190/0x194 |
| |
| The Linux kernel CVE team has assigned CVE-2022-48878 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.8 with commit 7e7bbddd029b644f00f0ffbfbc485ed71977d0d5 and fixed in 5.10.165 with commit e84ec6e25df9bb0968599e92eacedaf3a0a5b587 |
| Issue introduced in 5.8 with commit 7e7bbddd029b644f00f0ffbfbc485ed71977d0d5 and fixed in 5.15.90 with commit 908d1742b6e694e84ead5c62e4b7c1bfbb8b46a3 |
| Issue introduced in 5.8 with commit 7e7bbddd029b644f00f0ffbfbc485ed71977d0d5 and fixed in 6.1.8 with commit ea3ebda47dd56f6e1c62f2e0e1b6e1b0a973e447 |
| Issue introduced in 5.8 with commit 7e7bbddd029b644f00f0ffbfbc485ed71977d0d5 and fixed in 6.2 with commit 272970be3dabd24cbe50e393ffee8f04aec3b9a8 |
| |
| 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-2022-48878 |
| 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/bluetooth/hci_qca.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/e84ec6e25df9bb0968599e92eacedaf3a0a5b587 |
| https://git.kernel.org/stable/c/908d1742b6e694e84ead5c62e4b7c1bfbb8b46a3 |
| https://git.kernel.org/stable/c/ea3ebda47dd56f6e1c62f2e0e1b6e1b0a973e447 |
| https://git.kernel.org/stable/c/272970be3dabd24cbe50e393ffee8f04aec3b9a8 |
