CVE-2022-48940 (GCVE-0-2022-48940)

Vulnerability from cvelistv5 – Published: 2024-08-22 03:31 – Updated: 2025-05-04 08:26
VLAI?
Title
bpf: Fix crash due to incorrect copy_map_value
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix crash due to incorrect copy_map_value When both bpf_spin_lock and bpf_timer are present in a BPF map value, copy_map_value needs to skirt both objects when copying a value into and out of the map. However, the current code does not set both s_off and t_off in copy_map_value, which leads to a crash when e.g. bpf_spin_lock is placed in map value with bpf_timer, as bpf_map_update_elem call will be able to overwrite the other timer object. When the issue is not fixed, an overwriting can produce the following splat: [root@(none) bpf]# ./test_progs -t timer_crash [ 15.930339] bpf_testmod: loading out-of-tree module taints kernel. [ 16.037849] ================================================================== [ 16.038458] BUG: KASAN: user-memory-access in __pv_queued_spin_lock_slowpath+0x32b/0x520 [ 16.038944] Write of size 8 at addr 0000000000043ec0 by task test_progs/325 [ 16.039399] [ 16.039514] CPU: 0 PID: 325 Comm: test_progs Tainted: G OE 5.16.0+ #278 [ 16.039983] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS ArchLinux 1.15.0-1 04/01/2014 [ 16.040485] Call Trace: [ 16.040645] <TASK> [ 16.040805] dump_stack_lvl+0x59/0x73 [ 16.041069] ? __pv_queued_spin_lock_slowpath+0x32b/0x520 [ 16.041427] kasan_report.cold+0x116/0x11b [ 16.041673] ? __pv_queued_spin_lock_slowpath+0x32b/0x520 [ 16.042040] __pv_queued_spin_lock_slowpath+0x32b/0x520 [ 16.042328] ? memcpy+0x39/0x60 [ 16.042552] ? pv_hash+0xd0/0xd0 [ 16.042785] ? lockdep_hardirqs_off+0x95/0xd0 [ 16.043079] __bpf_spin_lock_irqsave+0xdf/0xf0 [ 16.043366] ? bpf_get_current_comm+0x50/0x50 [ 16.043608] ? jhash+0x11a/0x270 [ 16.043848] bpf_timer_cancel+0x34/0xe0 [ 16.044119] bpf_prog_c4ea1c0f7449940d_sys_enter+0x7c/0x81 [ 16.044500] bpf_trampoline_6442477838_0+0x36/0x1000 [ 16.044836] __x64_sys_nanosleep+0x5/0x140 [ 16.045119] do_syscall_64+0x59/0x80 [ 16.045377] ? lock_is_held_type+0xe4/0x140 [ 16.045670] ? irqentry_exit_to_user_mode+0xa/0x40 [ 16.046001] ? mark_held_locks+0x24/0x90 [ 16.046287] ? asm_exc_page_fault+0x1e/0x30 [ 16.046569] ? asm_exc_page_fault+0x8/0x30 [ 16.046851] ? lockdep_hardirqs_on+0x7e/0x100 [ 16.047137] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 16.047405] RIP: 0033:0x7f9e4831718d [ 16.047602] Code: b4 0c 00 0f 05 eb a9 66 0f 1f 44 00 00 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d b3 6c 0c 00 f7 d8 64 89 01 48 [ 16.048764] RSP: 002b:00007fff488086b8 EFLAGS: 00000206 ORIG_RAX: 0000000000000023 [ 16.049275] RAX: ffffffffffffffda RBX: 00007f9e48683740 RCX: 00007f9e4831718d [ 16.049747] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007fff488086d0 [ 16.050225] RBP: 00007fff488086f0 R08: 00007fff488085d7 R09: 00007f9e4cb594a0 [ 16.050648] R10: 0000000000000000 R11: 0000000000000206 R12: 00007f9e484cde30 [ 16.051124] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 16.051608] </TASK> [ 16.051762] ==================================================================
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 68134668c17f31f51930478f75495b552a411550 , < 719d1c2524c89ada78c4c9202641c1d9e942a322 (git)
Affected: 68134668c17f31f51930478f75495b552a411550 , < eca9bd215d2233de79d930fa97aefbce03247a98 (git)
Affected: 68134668c17f31f51930478f75495b552a411550 , < a8abb0c3dc1e28454851a00f8b7333d9695d566c (git)
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    Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 5.15.26 , ≤ 5.15.* (semver)
Unaffected: 5.16.12 , ≤ 5.16.* (semver)
Unaffected: 5.17 , ≤ * (original_commit_for_fix)
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                "id": "CVE-2022-48940",
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix crash due to incorrect copy_map_value\n\nWhen both bpf_spin_lock and bpf_timer are present in a BPF map value,\ncopy_map_value needs to skirt both objects when copying a value into and\nout of the map. However, the current code does not set both s_off and\nt_off in copy_map_value, which leads to a crash when e.g. bpf_spin_lock\nis placed in map value with bpf_timer, as bpf_map_update_elem call will\nbe able to overwrite the other timer object.\n\nWhen the issue is not fixed, an overwriting can produce the following\nsplat:\n\n[root@(none) bpf]# ./test_progs -t timer_crash\n[   15.930339] bpf_testmod: loading out-of-tree module taints kernel.\n[   16.037849] ==================================================================\n[   16.038458] BUG: KASAN: user-memory-access in __pv_queued_spin_lock_slowpath+0x32b/0x520\n[   16.038944] Write of size 8 at addr 0000000000043ec0 by task test_progs/325\n[   16.039399]\n[   16.039514] CPU: 0 PID: 325 Comm: test_progs Tainted: G           OE     5.16.0+ #278\n[   16.039983] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS ArchLinux 1.15.0-1 04/01/2014\n[   16.040485] Call Trace:\n[   16.040645]  \u003cTASK\u003e\n[   16.040805]  dump_stack_lvl+0x59/0x73\n[   16.041069]  ? __pv_queued_spin_lock_slowpath+0x32b/0x520\n[   16.041427]  kasan_report.cold+0x116/0x11b\n[   16.041673]  ? __pv_queued_spin_lock_slowpath+0x32b/0x520\n[   16.042040]  __pv_queued_spin_lock_slowpath+0x32b/0x520\n[   16.042328]  ? memcpy+0x39/0x60\n[   16.042552]  ? pv_hash+0xd0/0xd0\n[   16.042785]  ? lockdep_hardirqs_off+0x95/0xd0\n[   16.043079]  __bpf_spin_lock_irqsave+0xdf/0xf0\n[   16.043366]  ? bpf_get_current_comm+0x50/0x50\n[   16.043608]  ? jhash+0x11a/0x270\n[   16.043848]  bpf_timer_cancel+0x34/0xe0\n[   16.044119]  bpf_prog_c4ea1c0f7449940d_sys_enter+0x7c/0x81\n[   16.044500]  bpf_trampoline_6442477838_0+0x36/0x1000\n[   16.044836]  __x64_sys_nanosleep+0x5/0x140\n[   16.045119]  do_syscall_64+0x59/0x80\n[   16.045377]  ? lock_is_held_type+0xe4/0x140\n[   16.045670]  ? irqentry_exit_to_user_mode+0xa/0x40\n[   16.046001]  ? mark_held_locks+0x24/0x90\n[   16.046287]  ? asm_exc_page_fault+0x1e/0x30\n[   16.046569]  ? asm_exc_page_fault+0x8/0x30\n[   16.046851]  ? lockdep_hardirqs_on+0x7e/0x100\n[   16.047137]  entry_SYSCALL_64_after_hwframe+0x44/0xae\n[   16.047405] RIP: 0033:0x7f9e4831718d\n[   16.047602] Code: b4 0c 00 0f 05 eb a9 66 0f 1f 44 00 00 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 \u003c48\u003e 3d 01 f0 ff ff 73 01 c3 48 8b 0d b3 6c 0c 00 f7 d8 64 89 01 48\n[   16.048764] RSP: 002b:00007fff488086b8 EFLAGS: 00000206 ORIG_RAX: 0000000000000023\n[   16.049275] RAX: ffffffffffffffda RBX: 00007f9e48683740 RCX: 00007f9e4831718d\n[   16.049747] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007fff488086d0\n[   16.050225] RBP: 00007fff488086f0 R08: 00007fff488085d7 R09: 00007f9e4cb594a0\n[   16.050648] R10: 0000000000000000 R11: 0000000000000206 R12: 00007f9e484cde30\n[   16.051124] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000\n[   16.051608]  \u003c/TASK\u003e\n[   16.051762] =================================================================="
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      "title": "bpf: Fix crash due to incorrect copy_map_value",
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    "cveId": "CVE-2022-48940",
    "datePublished": "2024-08-22T03:31:35.844Z",
    "dateReserved": "2024-08-22T01:27:53.623Z",
    "dateUpdated": "2025-05-04T08:26:34.156Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2022-48940\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-09-10T15:32:21.126516Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-09-11T12:42:12.597Z\"}}], \"cna\": {\"title\": \"bpf: Fix crash due to incorrect copy_map_value\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"68134668c17f\", \"lessThan\": \"719d1c2524c8\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"68134668c17f\", \"lessThan\": \"eca9bd215d22\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"68134668c17f\", \"lessThan\": \"a8abb0c3dc1e\", \"versionType\": \"git\"}], \"programFiles\": [\"include/linux/bpf.h\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.15\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.15\", \"versionType\": \"custom\"}, {\"status\": \"unaffected\", \"version\": \"5.15.26\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"5.16.12\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"5.16.*\"}, {\"status\": \"unaffected\", \"version\": \"5.17\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"include/linux/bpf.h\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/719d1c2524c89ada78c4c9202641c1d9e942a322\"}, {\"url\": \"https://git.kernel.org/stable/c/eca9bd215d2233de79d930fa97aefbce03247a98\"}, {\"url\": \"https://git.kernel.org/stable/c/a8abb0c3dc1e28454851a00f8b7333d9695d566c\"}], \"x_generator\": {\"engine\": \"bippy-c9c4e1df01b2\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbpf: Fix crash due to incorrect copy_map_value\\n\\nWhen both bpf_spin_lock and bpf_timer are present in a BPF map value,\\ncopy_map_value needs to skirt both objects when copying a value into and\\nout of the map. However, the current code does not set both s_off and\\nt_off in copy_map_value, which leads to a crash when e.g. bpf_spin_lock\\nis placed in map value with bpf_timer, as bpf_map_update_elem call will\\nbe able to overwrite the other timer object.\\n\\nWhen the issue is not fixed, an overwriting can produce the following\\nsplat:\\n\\n[root@(none) bpf]# ./test_progs -t timer_crash\\n[   15.930339] bpf_testmod: loading out-of-tree module taints kernel.\\n[   16.037849] ==================================================================\\n[   16.038458] BUG: KASAN: user-memory-access in __pv_queued_spin_lock_slowpath+0x32b/0x520\\n[   16.038944] Write of size 8 at addr 0000000000043ec0 by task test_progs/325\\n[   16.039399]\\n[   16.039514] CPU: 0 PID: 325 Comm: test_progs Tainted: G           OE     5.16.0+ #278\\n[   16.039983] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS ArchLinux 1.15.0-1 04/01/2014\\n[   16.040485] Call Trace:\\n[   16.040645]  \u003cTASK\u003e\\n[   16.040805]  dump_stack_lvl+0x59/0x73\\n[   16.041069]  ? __pv_queued_spin_lock_slowpath+0x32b/0x520\\n[   16.041427]  kasan_report.cold+0x116/0x11b\\n[   16.041673]  ? __pv_queued_spin_lock_slowpath+0x32b/0x520\\n[   16.042040]  __pv_queued_spin_lock_slowpath+0x32b/0x520\\n[   16.042328]  ? memcpy+0x39/0x60\\n[   16.042552]  ? pv_hash+0xd0/0xd0\\n[   16.042785]  ? lockdep_hardirqs_off+0x95/0xd0\\n[   16.043079]  __bpf_spin_lock_irqsave+0xdf/0xf0\\n[   16.043366]  ? bpf_get_current_comm+0x50/0x50\\n[   16.043608]  ? jhash+0x11a/0x270\\n[   16.043848]  bpf_timer_cancel+0x34/0xe0\\n[   16.044119]  bpf_prog_c4ea1c0f7449940d_sys_enter+0x7c/0x81\\n[   16.044500]  bpf_trampoline_6442477838_0+0x36/0x1000\\n[   16.044836]  __x64_sys_nanosleep+0x5/0x140\\n[   16.045119]  do_syscall_64+0x59/0x80\\n[   16.045377]  ? lock_is_held_type+0xe4/0x140\\n[   16.045670]  ? irqentry_exit_to_user_mode+0xa/0x40\\n[   16.046001]  ? mark_held_locks+0x24/0x90\\n[   16.046287]  ? asm_exc_page_fault+0x1e/0x30\\n[   16.046569]  ? asm_exc_page_fault+0x8/0x30\\n[   16.046851]  ? lockdep_hardirqs_on+0x7e/0x100\\n[   16.047137]  entry_SYSCALL_64_after_hwframe+0x44/0xae\\n[   16.047405] RIP: 0033:0x7f9e4831718d\\n[   16.047602] Code: b4 0c 00 0f 05 eb a9 66 0f 1f 44 00 00 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 \u003c48\u003e 3d 01 f0 ff ff 73 01 c3 48 8b 0d b3 6c 0c 00 f7 d8 64 89 01 48\\n[   16.048764] RSP: 002b:00007fff488086b8 EFLAGS: 00000206 ORIG_RAX: 0000000000000023\\n[   16.049275] RAX: ffffffffffffffda RBX: 00007f9e48683740 RCX: 00007f9e4831718d\\n[   16.049747] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007fff488086d0\\n[   16.050225] RBP: 00007fff488086f0 R08: 00007fff488085d7 R09: 00007f9e4cb594a0\\n[   16.050648] R10: 0000000000000000 R11: 0000000000000206 R12: 00007f9e484cde30\\n[   16.051124] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000\\n[   16.051608]  \u003c/TASK\u003e\\n[   16.051762] ==================================================================\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-08-22T03:31:35.844Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2022-48940\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-09-12T17:32:59.231Z\", \"dateReserved\": \"2024-08-22T01:27:53.623Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-08-22T03:31:35.844Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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