nvd-json-data-feeds/CVE-2022/CVE-2022-494xx/CVE-2022-49402.json

{
  "id": "CVE-2022-49402",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2025-02-26T07:01:16.750",
  "lastModified": "2025-02-26T07:01:16.750",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nftrace: Clean up hash direct_functions on register failures\n\nWe see the following GPF when register_ftrace_direct fails:\n\n[ ] general protection fault, probably for non-canonical address \\\n  0x200000000000010: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC PTI\n[...]\n[ ] RIP: 0010:ftrace_find_rec_direct+0x53/0x70\n[ ] Code: 48 c1 e0 03 48 03 42 08 48 8b 10 31 c0 48 85 d2 74 [...]\n[ ] RSP: 0018:ffffc9000138bc10 EFLAGS: 00010206\n[ ] RAX: 0000000000000000 RBX: ffffffff813e0df0 RCX: 000000000000003b\n[ ] RDX: 0200000000000000 RSI: 000000000000000c RDI: ffffffff813e0df0\n[ ] RBP: ffffffffa00a3000 R08: ffffffff81180ce0 R09: 0000000000000001\n[ ] R10: ffffc9000138bc18 R11: 0000000000000001 R12: ffffffff813e0df0\n[ ] R13: ffffffff813e0df0 R14: ffff888171b56400 R15: 0000000000000000\n[ ] FS:  00007fa9420c7780(0000) GS:ffff888ff6a00000(0000) knlGS:000000000\n[ ] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ ] CR2: 000000000770d000 CR3: 0000000107d50003 CR4: 0000000000370ee0\n[ ] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n[ ] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n[ ] Call Trace:\n[ ]  <TASK>\n[ ]  register_ftrace_direct+0x54/0x290\n[ ]  ? render_sigset_t+0xa0/0xa0\n[ ]  bpf_trampoline_update+0x3f5/0x4a0\n[ ]  ? 0xffffffffa00a3000\n[ ]  bpf_trampoline_link_prog+0xa9/0x140\n[ ]  bpf_tracing_prog_attach+0x1dc/0x450\n[ ]  bpf_raw_tracepoint_open+0x9a/0x1e0\n[ ]  ? find_held_lock+0x2d/0x90\n[ ]  ? lock_release+0x150/0x430\n[ ]  __sys_bpf+0xbd6/0x2700\n[ ]  ? lock_is_held_type+0xd8/0x130\n[ ]  __x64_sys_bpf+0x1c/0x20\n[ ]  do_syscall_64+0x3a/0x80\n[ ]  entry_SYSCALL_64_after_hwframe+0x44/0xae\n[ ] RIP: 0033:0x7fa9421defa9\n[ ] Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 9 f8 [...]\n[ ] RSP: 002b:00007ffed743bd78 EFLAGS: 00000246 ORIG_RAX: 0000000000000141\n[ ] RAX: ffffffffffffffda RBX: 00000000069d2480 RCX: 00007fa9421defa9\n[ ] RDX: 0000000000000078 RSI: 00007ffed743bd80 RDI: 0000000000000011\n[ ] RBP: 00007ffed743be00 R08: 0000000000bb7270 R09: 0000000000000000\n[ ] R10: 00000000069da210 R11: 0000000000000246 R12: 0000000000000001\n[ ] R13: 00007ffed743c4b0 R14: 00000000069d2480 R15: 0000000000000001\n[ ]  </TASK>\n[ ] Modules linked in: klp_vm(OK)\n[ ] ---[ end trace 0000000000000000 ]---\n\nOne way to trigger this is:\n  1. load a livepatch that patches kernel function xxx;\n  2. run bpftrace -e 'kfunc:xxx {}', this will fail (expected for now);\n  3. repeat #2 => gpf.\n\nThis is because the entry is added to direct_functions, but not removed.\nFix this by remove the entry from direct_functions when\nregister_ftrace_direct fails.\n\nAlso remove the last trailing space from ftrace.c, so we don't have to\nworry about it anymore."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ftrace: Limpiar hash direct_functions en caso de fallos de registro Vemos el siguiente GPF cuando falla register_ftrace_direct: [ ] fallo de protecci\u00f3n general, probablemente para direcci\u00f3n no can\u00f3nica \\ 0x200000000000010: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC PTI [...] [ ] RIP: 0010:ftrace_find_rec_direct+0x53/0x70 [ ] Code: 48 c1 e0 03 48 03 42 08 48 8b 10 31 c0 48 85 d2 74 [...] [ ] RSP: 0018:ffffc9000138bc10 EFLAGS: 00010206 [ ] RAX: 0000000000000000 RBX: ffffffff813e0df0 RCX: 000000000000003b [ ] RDX: 0200000000000000 RSI: 000000000000000c RDI: ffffffff813e0df0 [ ] RBP: ffffffffa00a3000 R08: ffffffff81180ce0 R09: 0000000000000001 [ ] R10: ffffc9000138bc18 R11: 0000000000000001 R12: ffffffff813e0df0 [ ] R13: ffffffff813e0df0 R14: ffff888171b56400 R15: 0000000000000000 [ ] FS: 00007fa9420c7780(0000) GS:ffff888ff6a00000(0000) knlGS:000000000 [ ] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ ] CR2: 000000000770d000 CR3: 0000000107d50003 CR4: 0000000000370ee0 [ ] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ ] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ ] Call Trace: [ ]  [ ] register_ftrace_direct+0x54/0x290 [ ] ? render_sigset_t+0xa0/0xa0 [ ] bpf_trampoline_update+0x3f5/0x4a0 [ ] ? 0xffffffffa00a3000 [ ] bpf_trampoline_link_prog+0xa9/0x140 [ ] bpf_tracing_prog_attach+0x1dc/0x450 [ ] bpf_raw_tracepoint_open+0x9a/0x1e0 [ ] ? find_held_lock+0x2d/0x90 [ ] ? lock_release+0x150/0x430 [ ] __sys_bpf+0xbd6/0x2700 [ ] ? lock_is_held_type+0xd8/0x130 [ ] __x64_sys_bpf+0x1c/0x20 [ ] do_syscall_64+0x3a/0x80 [ ] entry_SYSCALL_64_after_hwframe+0x44/0xae [ ] RIP: 0033:0x7fa9421defa9 [ ] Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 9 f8 [...] [ ] RSP: 002b:00007ffed743bd78 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 [ ] RAX: ffffffffffffffda RBX: 00000000069d2480 RCX: 00007fa9421defa9 [ ] RDX: 0000000000000078 RSI: 00007ffed743bd80 RDI: 0000000000000011 [ ] RBP: 00007ffed743be00 R08: 0000000000bb7270 R09: 0000000000000000 [ ] R10: 00000000069da210 R11: 0000000000000246 R12: 0000000000000001 [ ] R13: 00007ffed743c4b0 R14: 00000000069d2480 R15: 0000000000000001 [ ]  [ ] Modules linked in: klp_vm(OK) [ ] ---[ end trace 0000000000000000 ]--- One way to trigger this is: 1. load a livepatch that patches kernel function xxx; 2. run bpftrace -e 'kfunc:xxx {}', esto fallar\u00e1 (esperado por ahora); 3. repetir #2 =&gt; gpf. Esto se debe a que la entrada se agrega a direct_functions, pero no se elimina. Solucione esto eliminando la entrada de direct_functions cuando register_ftrace_direct falle. Tambi\u00e9n elimine el \u00faltimo espacio final de ftrace.c, para que ya no tengamos que preocuparnos por eso."
    }
  ],
  "metrics": {},
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/7d54c15cb89a29a5f59e5ffc9ee62e6591769ef1",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/805e87af946d8d2954171361e64d143ff37a441b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/82c888e51c2176a06f8b4541cf748ee81aac6e7e",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/a0392833a178cf109a57c2a9d4d531bdfc6cd98f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/cae2978d6907ef2c08b9b15f704e783f7c284713",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}