| 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-2024-46782: ila: call nf_unregister_net_hooks() sooner |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| ila: call nf_unregister_net_hooks() sooner |
| |
| syzbot found an use-after-free Read in ila_nf_input [1] |
| |
| Issue here is that ila_xlat_exit_net() frees the rhashtable, |
| then call nf_unregister_net_hooks(). |
| |
| It should be done in the reverse way, with a synchronize_rcu(). |
| |
| This is a good match for a pre_exit() method. |
| |
| [1] |
| BUG: KASAN: use-after-free in rht_key_hashfn include/linux/rhashtable.h:159 [inline] |
| BUG: KASAN: use-after-free in __rhashtable_lookup include/linux/rhashtable.h:604 [inline] |
| BUG: KASAN: use-after-free in rhashtable_lookup include/linux/rhashtable.h:646 [inline] |
| BUG: KASAN: use-after-free in rhashtable_lookup_fast+0x77a/0x9b0 include/linux/rhashtable.h:672 |
| Read of size 4 at addr ffff888064620008 by task ksoftirqd/0/16 |
| |
| CPU: 0 UID: 0 PID: 16 Comm: ksoftirqd/0 Not tainted 6.11.0-rc4-syzkaller-00238-g2ad6d23f465a #0 |
| Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 |
| Call Trace: |
| <TASK> |
| __dump_stack lib/dump_stack.c:93 [inline] |
| dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119 |
| print_address_description mm/kasan/report.c:377 [inline] |
| print_report+0x169/0x550 mm/kasan/report.c:488 |
| kasan_report+0x143/0x180 mm/kasan/report.c:601 |
| rht_key_hashfn include/linux/rhashtable.h:159 [inline] |
| __rhashtable_lookup include/linux/rhashtable.h:604 [inline] |
| rhashtable_lookup include/linux/rhashtable.h:646 [inline] |
| rhashtable_lookup_fast+0x77a/0x9b0 include/linux/rhashtable.h:672 |
| ila_lookup_wildcards net/ipv6/ila/ila_xlat.c:132 [inline] |
| ila_xlat_addr net/ipv6/ila/ila_xlat.c:652 [inline] |
| ila_nf_input+0x1fe/0x3c0 net/ipv6/ila/ila_xlat.c:190 |
| nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline] |
| nf_hook_slow+0xc3/0x220 net/netfilter/core.c:626 |
| nf_hook include/linux/netfilter.h:269 [inline] |
| NF_HOOK+0x29e/0x450 include/linux/netfilter.h:312 |
| __netif_receive_skb_one_core net/core/dev.c:5661 [inline] |
| __netif_receive_skb+0x1ea/0x650 net/core/dev.c:5775 |
| process_backlog+0x662/0x15b0 net/core/dev.c:6108 |
| __napi_poll+0xcb/0x490 net/core/dev.c:6772 |
| napi_poll net/core/dev.c:6841 [inline] |
| net_rx_action+0x89b/0x1240 net/core/dev.c:6963 |
| handle_softirqs+0x2c4/0x970 kernel/softirq.c:554 |
| run_ksoftirqd+0xca/0x130 kernel/softirq.c:928 |
| smpboot_thread_fn+0x544/0xa30 kernel/smpboot.c:164 |
| kthread+0x2f0/0x390 kernel/kthread.c:389 |
| ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 |
| ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 |
| </TASK> |
| |
| The buggy address belongs to the physical page: |
| page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x64620 |
| flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) |
| page_type: 0xbfffffff(buddy) |
| raw: 00fff00000000000 ffffea0000959608 ffffea00019d9408 0000000000000000 |
| raw: 0000000000000000 0000000000000003 00000000bfffffff 0000000000000000 |
| page dumped because: kasan: bad access detected |
| page_owner tracks the page as freed |
| page last allocated via order 3, migratetype Unmovable, gfp_mask 0x52dc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_ZERO), pid 5242, tgid 5242 (syz-executor), ts 73611328570, free_ts 618981657187 |
| set_page_owner include/linux/page_owner.h:32 [inline] |
| post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1493 |
| prep_new_page mm/page_alloc.c:1501 [inline] |
| get_page_from_freelist+0x2e4c/0x2f10 mm/page_alloc.c:3439 |
| __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4695 |
| __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] |
| alloc_pages_node_noprof include/linux/gfp.h:296 [inline] |
| ___kmalloc_large_node+0x8b/0x1d0 mm/slub.c:4103 |
| __kmalloc_large_node_noprof+0x1a/0x80 mm/slub.c:4130 |
| __do_kmalloc_node mm/slub.c:4146 [inline] |
| __kmalloc_node_noprof+0x2d2/0x440 mm/slub.c:4164 |
| __kvmalloc_node_noprof+0x72/0x190 mm/util.c:650 |
| bucket_table_alloc lib/rhashtable.c:186 [inline] |
| rhashtable_init_noprof+0x534/0xa60 lib/rhashtable.c:1071 |
| ila_xlat_init_net+0xa0/0x110 net/ipv6/ila/ila_xlat.c:613 |
| ops_init+0x359/0x610 net/core/net_namespace.c:139 |
| setup_net+0x515/0xca0 net/core/net_namespace.c:343 |
| copy_net_ns+0x4e2/0x7b0 net/core/net_namespace.c:508 |
| create_new_namespaces+0x425/0x7b0 kernel/nsproxy.c:110 |
| unshare_nsproxy_namespaces+0x124/0x180 kernel/nsproxy.c:228 |
| ksys_unshare+0x619/0xc10 kernel/fork.c:3328 |
| __do_sys_unshare kernel/fork.c:3399 [inline] |
| __se_sys_unshare kernel/fork.c:3397 [inline] |
| __x64_sys_unshare+0x38/0x40 kernel/fork.c:3397 |
| page last free pid 11846 tgid 11846 stack trace: |
| reset_page_owner include/linux/page_owner.h:25 [inline] |
| free_pages_prepare mm/page_alloc.c:1094 [inline] |
| free_unref_page+0xd22/0xea0 mm/page_alloc.c:2612 |
| __folio_put+0x2c8/0x440 mm/swap.c:128 |
| folio_put include/linux/mm.h:1486 [inline] |
| free_large_kmalloc+0x105/0x1c0 mm/slub.c:4565 |
| kfree+0x1c4/0x360 mm/slub.c:4588 |
| rhashtable_free_and_destroy+0x7c6/0x920 lib/rhashtable.c:1169 |
| ila_xlat_exit_net+0x55/0x110 net/ipv6/ila/ila_xlat.c:626 |
| ops_exit_list net/core/net_namespace.c:173 [inline] |
| cleanup_net+0x802/0xcc0 net/core/net_namespace.c:640 |
| process_one_work kernel/workqueue.c:3231 [inline] |
| process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312 |
| worker_thread+0x86d/0xd40 kernel/workqueue.c:3390 |
| kthread+0x2f0/0x390 kernel/kthread.c:389 |
| ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 |
| ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 |
| |
| Memory state around the buggy address: |
| ffff88806461ff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc |
| ffff88806461ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc |
| >ffff888064620000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |
| ^ |
| ffff888064620080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |
| ffff888064620100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |
| |
| The Linux kernel CVE team has assigned CVE-2024-46782 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 4.5 with commit 7f00feaf107645d95a6d87e99b4d141ac0a08efd and fixed in 4.19.322 with commit 43d34110882b97ba1ec66cc8234b18983efb9abf |
| Issue introduced in 4.5 with commit 7f00feaf107645d95a6d87e99b4d141ac0a08efd and fixed in 5.4.284 with commit dcaf4e2216824839d26727a15b638c6a677bd9fc |
| Issue introduced in 4.5 with commit 7f00feaf107645d95a6d87e99b4d141ac0a08efd and fixed in 5.10.226 with commit 93ee345ba349922834e6a9d1dadabaedcc12dce6 |
| Issue introduced in 4.5 with commit 7f00feaf107645d95a6d87e99b4d141ac0a08efd and fixed in 5.15.167 with commit bda4d84ac0d5421b346faee720011f58bdb99673 |
| Issue introduced in 4.5 with commit 7f00feaf107645d95a6d87e99b4d141ac0a08efd and fixed in 6.1.110 with commit 925c18a7cff93d8a4320d652351294ff7d0ac93c |
| Issue introduced in 4.5 with commit 7f00feaf107645d95a6d87e99b4d141ac0a08efd and fixed in 6.6.51 with commit 18a5a16940464b301ea91bf5da3a324aedb347b2 |
| Issue introduced in 4.5 with commit 7f00feaf107645d95a6d87e99b4d141ac0a08efd and fixed in 6.10.10 with commit 47abd8adddbc0aecb8f231269ef659148d5dabe4 |
| Issue introduced in 4.5 with commit 7f00feaf107645d95a6d87e99b4d141ac0a08efd and fixed in 6.11 with commit 031ae72825cef43e4650140b800ad58bf7a6a466 |
| |
| 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-2024-46782 |
| 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: |
| net/ipv6/ila/ila.h |
| net/ipv6/ila/ila_main.c |
| net/ipv6/ila/ila_xlat.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/43d34110882b97ba1ec66cc8234b18983efb9abf |
| https://git.kernel.org/stable/c/dcaf4e2216824839d26727a15b638c6a677bd9fc |
| https://git.kernel.org/stable/c/93ee345ba349922834e6a9d1dadabaedcc12dce6 |
| https://git.kernel.org/stable/c/bda4d84ac0d5421b346faee720011f58bdb99673 |
| https://git.kernel.org/stable/c/925c18a7cff93d8a4320d652351294ff7d0ac93c |
| https://git.kernel.org/stable/c/18a5a16940464b301ea91bf5da3a324aedb347b2 |
| https://git.kernel.org/stable/c/47abd8adddbc0aecb8f231269ef659148d5dabe4 |
| https://git.kernel.org/stable/c/031ae72825cef43e4650140b800ad58bf7a6a466 |
