| 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-2022-48811: ibmvnic: don't release napi in __ibmvnic_open() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| ibmvnic: don't release napi in __ibmvnic_open() |
| |
| If __ibmvnic_open() encounters an error such as when setting link state, |
| it calls release_resources() which frees the napi structures needlessly. |
| Instead, have __ibmvnic_open() only clean up the work it did so far (i.e. |
| disable napi and irqs) and leave the rest to the callers. |
| |
| If caller of __ibmvnic_open() is ibmvnic_open(), it should release the |
| resources immediately. If the caller is do_reset() or do_hard_reset(), |
| they will release the resources on the next reset. |
| |
| This fixes following crash that occurred when running the drmgr command |
| several times to add/remove a vnic interface: |
| |
| [102056] ibmvnic 30000003 env3: Disabling rx_scrq[6] irq |
| [102056] ibmvnic 30000003 env3: Disabling rx_scrq[7] irq |
| [102056] ibmvnic 30000003 env3: Replenished 8 pools |
| Kernel attempted to read user page (10) - exploit attempt? (uid: 0) |
| BUG: Kernel NULL pointer dereference on read at 0x00000010 |
| Faulting instruction address: 0xc000000000a3c840 |
| Oops: Kernel access of bad area, sig: 11 [#1] |
| LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=2048 NUMA pSeries |
| ... |
| CPU: 9 PID: 102056 Comm: kworker/9:2 Kdump: loaded Not tainted 5.16.0-rc5-autotest-g6441998e2e37 #1 |
| Workqueue: events_long __ibmvnic_reset [ibmvnic] |
| NIP: c000000000a3c840 LR: c0080000029b5378 CTR: c000000000a3c820 |
| REGS: c0000000548e37e0 TRAP: 0300 Not tainted (5.16.0-rc5-autotest-g6441998e2e37) |
| MSR: 8000000000009033 <SF,EE,ME,IR,DR,RI,LE> CR: 28248484 XER: 00000004 |
| CFAR: c0080000029bdd24 DAR: 0000000000000010 DSISR: 40000000 IRQMASK: 0 |
| GPR00: c0080000029b55d0 c0000000548e3a80 c0000000028f0200 0000000000000000 |
| ... |
| NIP [c000000000a3c840] napi_enable+0x20/0xc0 |
| LR [c0080000029b5378] __ibmvnic_open+0xf0/0x430 [ibmvnic] |
| Call Trace: |
| [c0000000548e3a80] [0000000000000006] 0x6 (unreliable) |
| [c0000000548e3ab0] [c0080000029b55d0] __ibmvnic_open+0x348/0x430 [ibmvnic] |
| [c0000000548e3b40] [c0080000029bcc28] __ibmvnic_reset+0x500/0xdf0 [ibmvnic] |
| [c0000000548e3c60] [c000000000176228] process_one_work+0x288/0x570 |
| [c0000000548e3d00] [c000000000176588] worker_thread+0x78/0x660 |
| [c0000000548e3da0] [c0000000001822f0] kthread+0x1c0/0x1d0 |
| [c0000000548e3e10] [c00000000000cf64] ret_from_kernel_thread+0x5c/0x64 |
| Instruction dump: |
| 7d2948f8 792307e0 4e800020 60000000 3c4c01eb 384239e0 f821ffd1 39430010 |
| 38a0fff6 e92d1100 f9210028 39200000 <e9030010> f9010020 60420000 e9210020 |
| ---[ end trace 5f8033b08fd27706 ]--- |
| |
| The Linux kernel CVE team has assigned CVE-2022-48811 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 4.12 with commit ed651a10875f13135a5f59c1bae4d51b377b3925 and fixed in 5.15.27 with commit 960dfaf3b578dd23af012590e809ae2d58ba1827 |
| Issue introduced in 4.12 with commit ed651a10875f13135a5f59c1bae4d51b377b3925 and fixed in 5.16.10 with commit e08cb9056fb2564d1f6bad789bdf79ab09bf2f81 |
| Issue introduced in 4.12 with commit ed651a10875f13135a5f59c1bae4d51b377b3925 and fixed in 5.17 with commit 61772b0908c640d0309c40f7d41d062ca4e979fa |
| |
| 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-2022-48811 |
| 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/ibm/ibmvnic.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/960dfaf3b578dd23af012590e809ae2d58ba1827 |
| https://git.kernel.org/stable/c/e08cb9056fb2564d1f6bad789bdf79ab09bf2f81 |
| https://git.kernel.org/stable/c/61772b0908c640d0309c40f7d41d062ca4e979fa |
