{
"containers": {
"cna": {
"providerMetadata": {
"orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix a race condition between btf_put() and map_free()\n\nWhen running `./test_progs -j` in my local vm with latest kernel,\nI once hit a kasan error like below:\n\n [ 1887.184724] BUG: KASAN: slab-use-after-free in bpf_rb_root_free+0x1f8/0x2b0\n [ 1887.185599] Read of size 4 at addr ffff888106806910 by task kworker/u12:2/2830\n [ 1887.186498]\n [ 1887.186712] CPU: 3 PID: 2830 Comm: kworker/u12:2 Tainted: G OEL 6.7.0-rc3-00699-g90679706d486-dirty #494\n [ 1887.188034] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014\n [ 1887.189618] Workqueue: events_unbound bpf_map_free_deferred\n [ 1887.190341] Call Trace:\n [ 1887.190666] \n [ 1887.190949] dump_stack_lvl+0xac/0xe0\n [ 1887.191423] ? nf_tcp_handle_invalid+0x1b0/0x1b0\n [ 1887.192019] ? panic+0x3c0/0x3c0\n [ 1887.192449] print_report+0x14f/0x720\n [ 1887.192930] ? preempt_count_sub+0x1c/0xd0\n [ 1887.193459] ? __virt_addr_valid+0xac/0x120\n [ 1887.194004] ? bpf_rb_root_free+0x1f8/0x2b0\n [ 1887.194572] kasan_report+0xc3/0x100\n [ 1887.195085] ? bpf_rb_root_free+0x1f8/0x2b0\n [ 1887.195668] bpf_rb_root_free+0x1f8/0x2b0\n [ 1887.196183] ? __bpf_obj_drop_impl+0xb0/0xb0\n [ 1887.196736] ? preempt_count_sub+0x1c/0xd0\n [ 1887.197270] ? preempt_count_sub+0x1c/0xd0\n [ 1887.197802] ? _raw_spin_unlock+0x1f/0x40\n [ 1887.198319] bpf_obj_free_fields+0x1d4/0x260\n [ 1887.198883] array_map_free+0x1a3/0x260\n [ 1887.199380] bpf_map_free_deferred+0x7b/0xe0\n [ 1887.199943] process_scheduled_works+0x3a2/0x6c0\n [ 1887.200549] worker_thread+0x633/0x890\n [ 1887.201047] ? __kthread_parkme+0xd7/0xf0\n [ 1887.201574] ? kthread+0x102/0x1d0\n [ 1887.202020] kthread+0x1ab/0x1d0\n [ 1887.202447] ? pr_cont_work+0x270/0x270\n [ 1887.202954] ? kthread_blkcg+0x50/0x50\n [ 1887.203444] ret_from_fork+0x34/0x50\n [ 1887.203914] ? kthread_blkcg+0x50/0x50\n [ 1887.204397] ret_from_fork_asm+0x11/0x20\n [ 1887.204913] \n [ 1887.204913] \n [ 1887.205209]\n [ 1887.205416] Allocated by task 2197:\n [ 1887.205881] kasan_set_track+0x3f/0x60\n [ 1887.206366] __kasan_kmalloc+0x6e/0x80\n [ 1887.206856] __kmalloc+0xac/0x1a0\n [ 1887.207293] btf_parse_fields+0xa15/0x1480\n [ 1887.207836] btf_parse_struct_metas+0x566/0x670\n [ 1887.208387] btf_new_fd+0x294/0x4d0\n [ 1887.208851] __sys_bpf+0x4ba/0x600\n [ 1887.209292] __x64_sys_bpf+0x41/0x50\n [ 1887.209762] do_syscall_64+0x4c/0xf0\n [ 1887.210222] entry_SYSCALL_64_after_hwframe+0x63/0x6b\n [ 1887.210868]\n [ 1887.211074] Freed by task 36:\n [ 1887.211460] kasan_set_track+0x3f/0x60\n [ 1887.211951] kasan_save_free_info+0x28/0x40\n [ 1887.212485] ____kasan_slab_free+0x101/0x180\n [ 1887.213027] __kmem_cache_free+0xe4/0x210\n [ 1887.213514] btf_free+0x5b/0x130\n [ 1887.213918] rcu_core+0x638/0xcc0\n [ 1887.214347] __do_softirq+0x114/0x37e\n\nThe error happens at bpf_rb_root_free+0x1f8/0x2b0:\n\n 00000000000034c0 :\n ; {\n 34c0: f3 0f 1e fa endbr64\n 34c4: e8 00 00 00 00 callq 0x34c9 \n 34c9: 55 pushq %rbp\n 34ca: 48 89 e5 movq %rsp, %rbp\n ...\n ; if (rec && rec->refcount_off >= 0 &&\n 36aa: 4d 85 ed testq %r13, %r13\n 36ad: 74 a9 je 0x3658 \n 36af: 49 8d 7d 10 leaq 0x10(%r13), %rdi\n 36b3: e8 00 00 00 00 callq 0x36b8 \n <==== kasan function\n 36b8: 45 8b 7d 10 movl 0x10(%r13), %r15d\n <==== use-after-free load\n 36bc: 45 85 ff testl %r15d, %r15d\n 36bf: 78 8c js 0x364d \n\nSo the problem \n---truncated---"
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"kernel/bpf/syscall.c"
],
"versions": [
{
"version": "958cf2e273f0",
"lessThan": "d048dced8ea5",
"status": "affected",
"versionType": "git"
},
{
"version": "958cf2e273f0",
"lessThan": "f9ff6ef1c73c",
"status": "affected",
"versionType": "git"
},
{
"version": "958cf2e273f0",
"lessThan": "59e5791f59dd",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"kernel/bpf/syscall.c"
],
"versions": [
{
"version": "6.2",
"status": "affected"
},
{
"version": "0",
"lessThan": "6.2",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.6.14",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.7.2",
"lessThanOrEqual": "6.7.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.8",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/d048dced8ea5eac6723ae873a40567e6f101ea42"
},
{
"url": "https://git.kernel.org/stable/c/f9ff6ef1c73cd9e1a6bb1ab3e57c5d141a536306"
},
{
"url": "https://git.kernel.org/stable/c/59e5791f59dd83e8aa72a4e74217eabb6e8cfd90"
}
],
"title": "bpf: Fix a race condition between btf_put() and map_free()",
"x_generator": {
"engine": "bippy-a5840b7849dd"
}
}
},
"cveMetadata": {
"assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038",
"cveID": "CVE-2023-52446",
"requesterUserId": "gregkh@kernel.org",
"serial": "1",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.0"
}