| From bippy-1.2.0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@kernel.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2022-49299: usb: dwc2: gadget: don't reset gadget's driver->bus |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| usb: dwc2: gadget: don't reset gadget's driver->bus |
| |
| UDC driver should not touch gadget's driver internals, especially it |
| should not reset driver->bus. This wasn't harmful so far, but since |
| commit fc274c1e9973 ("USB: gadget: Add a new bus for gadgets") gadget |
| subsystem got it's own bus and messing with ->bus triggers the |
| following NULL pointer dereference: |
| |
| dwc2 12480000.hsotg: bound driver g_ether |
| 8<--- cut here --- |
| Unable to handle kernel NULL pointer dereference at virtual address 00000000 |
| [00000000] *pgd=00000000 |
| Internal error: Oops: 5 [#1] SMP ARM |
| Modules linked in: ... |
| CPU: 0 PID: 620 Comm: modprobe Not tainted 5.18.0-rc5-next-20220504 #11862 |
| Hardware name: Samsung Exynos (Flattened Device Tree) |
| PC is at module_add_driver+0x44/0xe8 |
| LR is at sysfs_do_create_link_sd+0x84/0xe0 |
| ... |
| Process modprobe (pid: 620, stack limit = 0x(ptrval)) |
| ... |
| module_add_driver from bus_add_driver+0xf4/0x1e4 |
| bus_add_driver from driver_register+0x78/0x10c |
| driver_register from usb_gadget_register_driver_owner+0x40/0xb4 |
| usb_gadget_register_driver_owner from do_one_initcall+0x44/0x1e0 |
| do_one_initcall from do_init_module+0x44/0x1c8 |
| do_init_module from load_module+0x19b8/0x1b9c |
| load_module from sys_finit_module+0xdc/0xfc |
| sys_finit_module from ret_fast_syscall+0x0/0x54 |
| Exception stack(0xf1771fa8 to 0xf1771ff0) |
| ... |
| dwc2 12480000.hsotg: new device is high-speed |
| ---[ end trace 0000000000000000 ]--- |
| |
| Fix this by removing driver->bus entry reset. |
| |
| The Linux kernel CVE team has assigned CVE-2022-49299 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 4.9.318 with commit 5127c0f365265bb69cd776ad6e4b872c309f3fa8 |
| Fixed in 4.14.283 with commit efb15ff4a77fe053c941281775fefa91c87770e0 |
| Fixed in 4.19.247 with commit bee8f9808a7e82addfc73a0973b16a8bb684205b |
| Fixed in 5.4.198 with commit d232ca0bbc7d03144bad0ffd1792c3352bfd03fa |
| Fixed in 5.10.122 with commit 5b0c0298f7c3b57417f1729ec4071f76864b72dd |
| Fixed in 5.15.47 with commit 547ebdc200b862dff761ff4890f66d8217c33316 |
| Fixed in 5.17.15 with commit 172cfc167c8ee6238f24f9c16efd598602af643c |
| Fixed in 5.18.4 with commit d2159feb9d28ce496d77df98313ab454646372ac |
| Fixed in 5.19 with commit 3120aac6d0ecd9accf56894aeac0e265f74d3d5a |
| |
| 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-2022-49299 |
| 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/usb/dwc2/gadget.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/5127c0f365265bb69cd776ad6e4b872c309f3fa8 |
| https://git.kernel.org/stable/c/efb15ff4a77fe053c941281775fefa91c87770e0 |
| https://git.kernel.org/stable/c/bee8f9808a7e82addfc73a0973b16a8bb684205b |
| https://git.kernel.org/stable/c/d232ca0bbc7d03144bad0ffd1792c3352bfd03fa |
| https://git.kernel.org/stable/c/5b0c0298f7c3b57417f1729ec4071f76864b72dd |
| https://git.kernel.org/stable/c/547ebdc200b862dff761ff4890f66d8217c33316 |
| https://git.kernel.org/stable/c/172cfc167c8ee6238f24f9c16efd598602af643c |
| https://git.kernel.org/stable/c/d2159feb9d28ce496d77df98313ab454646372ac |
| https://git.kernel.org/stable/c/3120aac6d0ecd9accf56894aeac0e265f74d3d5a |
