| 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-2024-50122: PCI: Hold rescan lock while adding devices during host probe |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| PCI: Hold rescan lock while adding devices during host probe |
| |
| Since adding the PCI power control code, we may end up with a race between |
| the pwrctl platform device rescanning the bus and host controller probe |
| functions. The latter need to take the rescan lock when adding devices or |
| we may end up in an undefined state having two incompletely added devices |
| and hit the following crash when trying to remove the device over sysfs: |
| |
| Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 |
| Internal error: Oops: 0000000096000004 [#1] SMP |
| Call trace: |
| __pi_strlen+0x14/0x150 |
| kernfs_find_ns+0x80/0x13c |
| kernfs_remove_by_name_ns+0x54/0xf0 |
| sysfs_remove_bin_file+0x24/0x34 |
| pci_remove_resource_files+0x3c/0x84 |
| pci_remove_sysfs_dev_files+0x28/0x38 |
| pci_stop_bus_device+0x8c/0xd8 |
| pci_stop_bus_device+0x40/0xd8 |
| pci_stop_and_remove_bus_device_locked+0x28/0x48 |
| remove_store+0x70/0xb0 |
| dev_attr_store+0x20/0x38 |
| sysfs_kf_write+0x58/0x78 |
| kernfs_fop_write_iter+0xe8/0x184 |
| vfs_write+0x2dc/0x308 |
| ksys_write+0x7c/0xec |
| |
| The Linux kernel CVE team has assigned CVE-2024-50122 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.11 with commit 4565d2652a37e438e4cd729e2a8dfeffe34c958c and fixed in 6.11.6 with commit d4f38a0e7cc94615f63cf7765ca117e5cc2773ae |
| Issue introduced in 6.11 with commit 4565d2652a37e438e4cd729e2a8dfeffe34c958c and fixed in 6.12 with commit 1d59d474e1cb7d4fdf87dfaf96f44647f13ea590 |
| |
| 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-2024-50122 |
| 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/pci/probe.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/d4f38a0e7cc94615f63cf7765ca117e5cc2773ae |
| https://git.kernel.org/stable/c/1d59d474e1cb7d4fdf87dfaf96f44647f13ea590 |
