| 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-2022-48954: s390/qeth: fix use-after-free in hsci |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| s390/qeth: fix use-after-free in hsci |
| |
| KASAN found that addr was dereferenced after br2dev_event_work was freed. |
| |
| ================================================================== |
| BUG: KASAN: use-after-free in qeth_l2_br2dev_worker+0x5ba/0x6b0 |
| Read of size 1 at addr 00000000fdcea440 by task kworker/u760:4/540 |
| CPU: 17 PID: 540 Comm: kworker/u760:4 Tainted: G E 6.1.0-20221128.rc7.git1.5aa3bed4ce83.300.fc36.s390x+kasan #1 |
| Hardware name: IBM 8561 T01 703 (LPAR) |
| Workqueue: 0.0.8000_event qeth_l2_br2dev_worker |
| Call Trace: |
| [<000000016944d4ce>] dump_stack_lvl+0xc6/0xf8 |
| [<000000016942cd9c>] print_address_description.constprop.0+0x34/0x2a0 |
| [<000000016942d118>] print_report+0x110/0x1f8 |
| [<0000000167a7bd04>] kasan_report+0xfc/0x128 |
| [<000000016938d79a>] qeth_l2_br2dev_worker+0x5ba/0x6b0 |
| [<00000001673edd1e>] process_one_work+0x76e/0x1128 |
| [<00000001673ee85c>] worker_thread+0x184/0x1098 |
| [<000000016740718a>] kthread+0x26a/0x310 |
| [<00000001672c606a>] __ret_from_fork+0x8a/0xe8 |
| [<00000001694711da>] ret_from_fork+0xa/0x40 |
| Allocated by task 108338: |
| kasan_save_stack+0x40/0x68 |
| kasan_set_track+0x36/0x48 |
| __kasan_kmalloc+0xa0/0xc0 |
| qeth_l2_switchdev_event+0x25a/0x738 |
| atomic_notifier_call_chain+0x9c/0xf8 |
| br_switchdev_fdb_notify+0xf4/0x110 |
| fdb_notify+0x122/0x180 |
| fdb_add_entry.constprop.0.isra.0+0x312/0x558 |
| br_fdb_add+0x59e/0x858 |
| rtnl_fdb_add+0x58a/0x928 |
| rtnetlink_rcv_msg+0x5f8/0x8d8 |
| netlink_rcv_skb+0x1f2/0x408 |
| netlink_unicast+0x570/0x790 |
| netlink_sendmsg+0x752/0xbe0 |
| sock_sendmsg+0xca/0x110 |
| ____sys_sendmsg+0x510/0x6a8 |
| ___sys_sendmsg+0x12a/0x180 |
| __sys_sendmsg+0xe6/0x168 |
| __do_sys_socketcall+0x3c8/0x468 |
| do_syscall+0x22c/0x328 |
| __do_syscall+0x94/0xf0 |
| system_call+0x82/0xb0 |
| Freed by task 540: |
| kasan_save_stack+0x40/0x68 |
| kasan_set_track+0x36/0x48 |
| kasan_save_free_info+0x4c/0x68 |
| ____kasan_slab_free+0x14e/0x1a8 |
| __kasan_slab_free+0x24/0x30 |
| __kmem_cache_free+0x168/0x338 |
| qeth_l2_br2dev_worker+0x154/0x6b0 |
| process_one_work+0x76e/0x1128 |
| worker_thread+0x184/0x1098 |
| kthread+0x26a/0x310 |
| __ret_from_fork+0x8a/0xe8 |
| ret_from_fork+0xa/0x40 |
| Last potentially related work creation: |
| kasan_save_stack+0x40/0x68 |
| __kasan_record_aux_stack+0xbe/0xd0 |
| insert_work+0x56/0x2e8 |
| __queue_work+0x4ce/0xd10 |
| queue_work_on+0xf4/0x100 |
| qeth_l2_switchdev_event+0x520/0x738 |
| atomic_notifier_call_chain+0x9c/0xf8 |
| br_switchdev_fdb_notify+0xf4/0x110 |
| fdb_notify+0x122/0x180 |
| fdb_add_entry.constprop.0.isra.0+0x312/0x558 |
| br_fdb_add+0x59e/0x858 |
| rtnl_fdb_add+0x58a/0x928 |
| rtnetlink_rcv_msg+0x5f8/0x8d8 |
| netlink_rcv_skb+0x1f2/0x408 |
| netlink_unicast+0x570/0x790 |
| netlink_sendmsg+0x752/0xbe0 |
| sock_sendmsg+0xca/0x110 |
| ____sys_sendmsg+0x510/0x6a8 |
| ___sys_sendmsg+0x12a/0x180 |
| __sys_sendmsg+0xe6/0x168 |
| __do_sys_socketcall+0x3c8/0x468 |
| do_syscall+0x22c/0x328 |
| __do_syscall+0x94/0xf0 |
| system_call+0x82/0xb0 |
| Second to last potentially related work creation: |
| kasan_save_stack+0x40/0x68 |
| __kasan_record_aux_stack+0xbe/0xd0 |
| kvfree_call_rcu+0xb2/0x760 |
| kernfs_unlink_open_file+0x348/0x430 |
| kernfs_fop_release+0xc2/0x320 |
| __fput+0x1ae/0x768 |
| task_work_run+0x1bc/0x298 |
| exit_to_user_mode_prepare+0x1a0/0x1a8 |
| __do_syscall+0x94/0xf0 |
| system_call+0x82/0xb0 |
| The buggy address belongs to the object at 00000000fdcea400 |
| which belongs to the cache kmalloc-96 of size 96 |
| The buggy address is located 64 bytes inside of |
| 96-byte region [00000000fdcea400, 00000000fdcea460) |
| The buggy address belongs to the physical page: |
| page:000000005a9c26e8 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xfdcea |
| flags: 0x3ffff00000000200(slab|node=0|zone=1|lastcpupid=0x1ffff) |
| raw: 3ffff00000000200 0000000000000000 0000000100000122 000000008008cc00 |
| raw: 0000000000000000 0020004100000000 ffffffff00000001 0000000000000000 |
| page dumped because: kasan: bad access detected |
| Memory state around the buggy address: |
| 00000000fdcea300: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc |
| 00000000fdcea380: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc |
| >00000000fdcea400: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc |
| ^ |
| 00000000fdcea480: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc |
| 00000000fdcea500: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc |
| ================================================================== |
| |
| The Linux kernel CVE team has assigned CVE-2022-48954 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.15 with commit f7936b7b2663c99a096a5c432ba96ab1e91a6c0f and fixed in 5.15.83 with commit db6343a5b0d9661f2dd76f653c6d274d38234d2b |
| Issue introduced in 5.15 with commit f7936b7b2663c99a096a5c432ba96ab1e91a6c0f and fixed in 6.0.13 with commit bde0dfc7c4569406a6ddeec363d04a1df7b3073f |
| Issue introduced in 5.15 with commit f7936b7b2663c99a096a5c432ba96ab1e91a6c0f and fixed in 6.1 with commit ebaaadc332cd21e9df4dcf9ce12552d9354bbbe4 |
| |
| 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-2022-48954 |
| 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/s390/net/qeth_l2_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/db6343a5b0d9661f2dd76f653c6d274d38234d2b |
| https://git.kernel.org/stable/c/bde0dfc7c4569406a6ddeec363d04a1df7b3073f |
| https://git.kernel.org/stable/c/ebaaadc332cd21e9df4dcf9ce12552d9354bbbe4 |
