cve-2024-56614
Vulnerability from cvelistv5
Published
2024-12-27 14:51
Modified
2025-01-20 06:24
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: xsk: fix OOB map writes when deleting elements Jordy says: " In the xsk_map_delete_elem function an unsigned integer (map->max_entries) is compared with a user-controlled signed integer (k). Due to implicit type conversion, a large unsigned value for map->max_entries can bypass the intended bounds check: if (k >= map->max_entries) return -EINVAL; This allows k to hold a negative value (between -2147483648 and -2), which is then used as an array index in m->xsk_map[k], which results in an out-of-bounds access. spin_lock_bh(&m->lock); map_entry = &m->xsk_map[k]; // Out-of-bounds map_entry old_xs = unrcu_pointer(xchg(map_entry, NULL)); // Oob write if (old_xs) xsk_map_sock_delete(old_xs, map_entry); spin_unlock_bh(&m->lock); The xchg operation can then be used to cause an out-of-bounds write. Moreover, the invalid map_entry passed to xsk_map_sock_delete can lead to further memory corruption. " It indeed results in following splat: [76612.897343] BUG: unable to handle page fault for address: ffffc8fc2e461108 [76612.904330] #PF: supervisor write access in kernel mode [76612.909639] #PF: error_code(0x0002) - not-present page [76612.914855] PGD 0 P4D 0 [76612.917431] Oops: Oops: 0002 [#1] PREEMPT SMP [76612.921859] CPU: 11 UID: 0 PID: 10318 Comm: a.out Not tainted 6.12.0-rc1+ #470 [76612.929189] Hardware name: Intel Corporation S2600WFT/S2600WFT, BIOS SE5C620.86B.02.01.0008.031920191559 03/19/2019 [76612.939781] RIP: 0010:xsk_map_delete_elem+0x2d/0x60 [76612.944738] Code: 00 00 41 54 55 53 48 63 2e 3b 6f 24 73 38 4c 8d a7 f8 00 00 00 48 89 fb 4c 89 e7 e8 2d bf 05 00 48 8d b4 eb 00 01 00 00 31 ff <48> 87 3e 48 85 ff 74 05 e8 16 ff ff ff 4c 89 e7 e8 3e bc 05 00 31 [76612.963774] RSP: 0018:ffffc9002e407df8 EFLAGS: 00010246 [76612.969079] RAX: 0000000000000000 RBX: ffffc9002e461000 RCX: 0000000000000000 [76612.976323] RDX: 0000000000000001 RSI: ffffc8fc2e461108 RDI: 0000000000000000 [76612.983569] RBP: ffffffff80000001 R08: 0000000000000000 R09: 0000000000000007 [76612.990812] R10: ffffc9002e407e18 R11: ffff888108a38858 R12: ffffc9002e4610f8 [76612.998060] R13: ffff888108a38858 R14: 00007ffd1ae0ac78 R15: ffffc9002e4610c0 [76613.005303] FS: 00007f80b6f59740(0000) GS:ffff8897e0ec0000(0000) knlGS:0000000000000000 [76613.013517] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [76613.019349] CR2: ffffc8fc2e461108 CR3: 000000011e3ef001 CR4: 00000000007726f0 [76613.026595] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [76613.033841] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [76613.041086] PKRU: 55555554 [76613.043842] Call Trace: [76613.046331] <TASK> [76613.048468] ? __die+0x20/0x60 [76613.051581] ? page_fault_oops+0x15a/0x450 [76613.055747] ? search_extable+0x22/0x30 [76613.059649] ? search_bpf_extables+0x5f/0x80 [76613.063988] ? exc_page_fault+0xa9/0x140 [76613.067975] ? asm_exc_page_fault+0x22/0x30 [76613.072229] ? xsk_map_delete_elem+0x2d/0x60 [76613.076573] ? xsk_map_delete_elem+0x23/0x60 [76613.080914] __sys_bpf+0x19b7/0x23c0 [76613.084555] __x64_sys_bpf+0x1a/0x20 [76613.088194] do_syscall_64+0x37/0xb0 [76613.091832] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [76613.096962] RIP: 0033:0x7f80b6d1e88d [76613.100592] Code: 5b 41 5c c3 66 0f 1f 84 00 00 00 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 73 b5 0f 00 f7 d8 64 89 01 48 [76613.119631] RSP: 002b:00007ffd1ae0ac68 EFLAGS: 00000206 ORIG_RAX: 0000000000000141 [76613.131330] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f80b6d1e88d [76613.142632] RDX: 0000000000000098 RSI: 00007ffd1ae0ad20 RDI: 0000000000000003 [76613.153967] RBP: 00007ffd1ae0adc0 R08: 0000000000000000 R09: 0000000000000000 [76613.166030] R10: 00007f80b6f77040 R11: 0000000000000206 R12: 00007ffd1ae0aed8 [76613.177130] R13: 000055ddf42ce1e9 R14: 000055ddf42d0d98 R15: 00 ---truncated---
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/32cd3db7de97c0c7a018756ce66244342fd583f0Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4d03f705e9d7aabebc6bfa5810f8aab6d176cbb7Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d486b5741d987d3e0e6be4ac22cafdf94e6d1a47Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ed08c93d5a9801cc8f224a046411fd603c538d07Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f8abd03f83d5fe81e76eb93e2c4373eb9f75fd8aPatch
Impacted products
Vendor Product Version
Linux Linux Version: fbfc504a24f53f7ebe128ab55cb5dba634f4ece8
Version: fbfc504a24f53f7ebe128ab55cb5dba634f4ece8
Version: fbfc504a24f53f7ebe128ab55cb5dba634f4ece8
Version: fbfc504a24f53f7ebe128ab55cb5dba634f4ece8
Version: fbfc504a24f53f7ebe128ab55cb5dba634f4ece8
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   Linux Linux Version: 4.18
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/xdp/xskmap.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "4d03f705e9d7aabebc6bfa5810f8aab6d176cbb7",
              "status": "affected",
              "version": "fbfc504a24f53f7ebe128ab55cb5dba634f4ece8",
              "versionType": "git"
            },
            {
              "lessThan": "ed08c93d5a9801cc8f224a046411fd603c538d07",
              "status": "affected",
              "version": "fbfc504a24f53f7ebe128ab55cb5dba634f4ece8",
              "versionType": "git"
            },
            {
              "lessThan": "f8abd03f83d5fe81e76eb93e2c4373eb9f75fd8a",
              "status": "affected",
              "version": "fbfc504a24f53f7ebe128ab55cb5dba634f4ece8",
              "versionType": "git"
            },
            {
              "lessThan": "d486b5741d987d3e0e6be4ac22cafdf94e6d1a47",
              "status": "affected",
              "version": "fbfc504a24f53f7ebe128ab55cb5dba634f4ece8",
              "versionType": "git"
            },
            {
              "lessThan": "32cd3db7de97c0c7a018756ce66244342fd583f0",
              "status": "affected",
              "version": "fbfc504a24f53f7ebe128ab55cb5dba634f4ece8",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/xdp/xskmap.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.18"
            },
            {
              "lessThan": "4.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.174",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.120",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.66",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.13",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxsk: fix OOB map writes when deleting elements\n\nJordy says:\n\n\"\nIn the xsk_map_delete_elem function an unsigned integer\n(map-\u003emax_entries) is compared with a user-controlled signed integer\n(k). Due to implicit type conversion, a large unsigned value for\nmap-\u003emax_entries can bypass the intended bounds check:\n\n\tif (k \u003e= map-\u003emax_entries)\n\t\treturn -EINVAL;\n\nThis allows k to hold a negative value (between -2147483648 and -2),\nwhich is then used as an array index in m-\u003exsk_map[k], which results\nin an out-of-bounds access.\n\n\tspin_lock_bh(\u0026m-\u003elock);\n\tmap_entry = \u0026m-\u003exsk_map[k]; // Out-of-bounds map_entry\n\told_xs = unrcu_pointer(xchg(map_entry, NULL));  // Oob write\n\tif (old_xs)\n\t\txsk_map_sock_delete(old_xs, map_entry);\n\tspin_unlock_bh(\u0026m-\u003elock);\n\nThe xchg operation can then be used to cause an out-of-bounds write.\nMoreover, the invalid map_entry passed to xsk_map_sock_delete can lead\nto further memory corruption.\n\"\n\nIt indeed results in following splat:\n\n[76612.897343] BUG: unable to handle page fault for address: ffffc8fc2e461108\n[76612.904330] #PF: supervisor write access in kernel mode\n[76612.909639] #PF: error_code(0x0002) - not-present page\n[76612.914855] PGD 0 P4D 0\n[76612.917431] Oops: Oops: 0002 [#1] PREEMPT SMP\n[76612.921859] CPU: 11 UID: 0 PID: 10318 Comm: a.out Not tainted 6.12.0-rc1+ #470\n[76612.929189] Hardware name: Intel Corporation S2600WFT/S2600WFT, BIOS SE5C620.86B.02.01.0008.031920191559 03/19/2019\n[76612.939781] RIP: 0010:xsk_map_delete_elem+0x2d/0x60\n[76612.944738] Code: 00 00 41 54 55 53 48 63 2e 3b 6f 24 73 38 4c 8d a7 f8 00 00 00 48 89 fb 4c 89 e7 e8 2d bf 05 00 48 8d b4 eb 00 01 00 00 31 ff \u003c48\u003e 87 3e 48 85 ff 74 05 e8 16 ff ff ff 4c 89 e7 e8 3e bc 05 00 31\n[76612.963774] RSP: 0018:ffffc9002e407df8 EFLAGS: 00010246\n[76612.969079] RAX: 0000000000000000 RBX: ffffc9002e461000 RCX: 0000000000000000\n[76612.976323] RDX: 0000000000000001 RSI: ffffc8fc2e461108 RDI: 0000000000000000\n[76612.983569] RBP: ffffffff80000001 R08: 0000000000000000 R09: 0000000000000007\n[76612.990812] R10: ffffc9002e407e18 R11: ffff888108a38858 R12: ffffc9002e4610f8\n[76612.998060] R13: ffff888108a38858 R14: 00007ffd1ae0ac78 R15: ffffc9002e4610c0\n[76613.005303] FS:  00007f80b6f59740(0000) GS:ffff8897e0ec0000(0000) knlGS:0000000000000000\n[76613.013517] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[76613.019349] CR2: ffffc8fc2e461108 CR3: 000000011e3ef001 CR4: 00000000007726f0\n[76613.026595] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n[76613.033841] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n[76613.041086] PKRU: 55555554\n[76613.043842] Call Trace:\n[76613.046331]  \u003cTASK\u003e\n[76613.048468]  ? __die+0x20/0x60\n[76613.051581]  ? page_fault_oops+0x15a/0x450\n[76613.055747]  ? search_extable+0x22/0x30\n[76613.059649]  ? search_bpf_extables+0x5f/0x80\n[76613.063988]  ? exc_page_fault+0xa9/0x140\n[76613.067975]  ? asm_exc_page_fault+0x22/0x30\n[76613.072229]  ? xsk_map_delete_elem+0x2d/0x60\n[76613.076573]  ? xsk_map_delete_elem+0x23/0x60\n[76613.080914]  __sys_bpf+0x19b7/0x23c0\n[76613.084555]  __x64_sys_bpf+0x1a/0x20\n[76613.088194]  do_syscall_64+0x37/0xb0\n[76613.091832]  entry_SYSCALL_64_after_hwframe+0x4b/0x53\n[76613.096962] RIP: 0033:0x7f80b6d1e88d\n[76613.100592] Code: 5b 41 5c c3 66 0f 1f 84 00 00 00 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 73 b5 0f 00 f7 d8 64 89 01 48\n[76613.119631] RSP: 002b:00007ffd1ae0ac68 EFLAGS: 00000206 ORIG_RAX: 0000000000000141\n[76613.131330] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f80b6d1e88d\n[76613.142632] RDX: 0000000000000098 RSI: 00007ffd1ae0ad20 RDI: 0000000000000003\n[76613.153967] RBP: 00007ffd1ae0adc0 R08: 0000000000000000 R09: 0000000000000000\n[76613.166030] R10: 00007f80b6f77040 R11: 0000000000000206 R12: 00007ffd1ae0aed8\n[76613.177130] R13: 000055ddf42ce1e9 R14: 000055ddf42d0d98 R15: 00\n---truncated---"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-01-20T06:24:11.365Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/4d03f705e9d7aabebc6bfa5810f8aab6d176cbb7"
        },
        {
          "url": "https://git.kernel.org/stable/c/ed08c93d5a9801cc8f224a046411fd603c538d07"
        },
        {
          "url": "https://git.kernel.org/stable/c/f8abd03f83d5fe81e76eb93e2c4373eb9f75fd8a"
        },
        {
          "url": "https://git.kernel.org/stable/c/d486b5741d987d3e0e6be4ac22cafdf94e6d1a47"
        },
        {
          "url": "https://git.kernel.org/stable/c/32cd3db7de97c0c7a018756ce66244342fd583f0"
        }
      ],
      "title": "xsk: fix OOB map writes when deleting elements",
      "x_generator": {
        "engine": "bippy-5f407fcff5a0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-56614",
    "datePublished": "2024-12-27T14:51:19.154Z",
    "dateReserved": "2024-12-27T14:03:06.014Z",
    "dateUpdated": "2025-01-20T06:24:11.365Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-56614\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-12-27T15:15:20.897\",\"lastModified\":\"2025-01-08T17:10:39.210\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nxsk: fix OOB map writes when deleting elements\\n\\nJordy says:\\n\\n\\\"\\nIn the xsk_map_delete_elem function an unsigned integer\\n(map-\u003emax_entries) is compared with a user-controlled signed integer\\n(k). Due to implicit type conversion, a large unsigned value for\\nmap-\u003emax_entries can bypass the intended bounds check:\\n\\n\\tif (k \u003e= map-\u003emax_entries)\\n\\t\\treturn -EINVAL;\\n\\nThis allows k to hold a negative value (between -2147483648 and -2),\\nwhich is then used as an array index in m-\u003exsk_map[k], which results\\nin an out-of-bounds access.\\n\\n\\tspin_lock_bh(\u0026m-\u003elock);\\n\\tmap_entry = \u0026m-\u003exsk_map[k]; // Out-of-bounds map_entry\\n\\told_xs = unrcu_pointer(xchg(map_entry, NULL));  // Oob write\\n\\tif (old_xs)\\n\\t\\txsk_map_sock_delete(old_xs, map_entry);\\n\\tspin_unlock_bh(\u0026m-\u003elock);\\n\\nThe xchg operation can then be used to cause an out-of-bounds write.\\nMoreover, the invalid map_entry passed to xsk_map_sock_delete can lead\\nto further memory corruption.\\n\\\"\\n\\nIt indeed results in following splat:\\n\\n[76612.897343] BUG: unable to handle page fault for address: ffffc8fc2e461108\\n[76612.904330] #PF: supervisor write access in kernel mode\\n[76612.909639] #PF: error_code(0x0002) - not-present page\\n[76612.914855] PGD 0 P4D 0\\n[76612.917431] Oops: Oops: 0002 [#1] PREEMPT SMP\\n[76612.921859] CPU: 11 UID: 0 PID: 10318 Comm: a.out Not tainted 6.12.0-rc1+ #470\\n[76612.929189] Hardware name: Intel Corporation S2600WFT/S2600WFT, BIOS SE5C620.86B.02.01.0008.031920191559 03/19/2019\\n[76612.939781] RIP: 0010:xsk_map_delete_elem+0x2d/0x60\\n[76612.944738] Code: 00 00 41 54 55 53 48 63 2e 3b 6f 24 73 38 4c 8d a7 f8 00 00 00 48 89 fb 4c 89 e7 e8 2d bf 05 00 48 8d b4 eb 00 01 00 00 31 ff \u003c48\u003e 87 3e 48 85 ff 74 05 e8 16 ff ff ff 4c 89 e7 e8 3e bc 05 00 31\\n[76612.963774] RSP: 0018:ffffc9002e407df8 EFLAGS: 00010246\\n[76612.969079] RAX: 0000000000000000 RBX: ffffc9002e461000 RCX: 0000000000000000\\n[76612.976323] RDX: 0000000000000001 RSI: ffffc8fc2e461108 RDI: 0000000000000000\\n[76612.983569] RBP: ffffffff80000001 R08: 0000000000000000 R09: 0000000000000007\\n[76612.990812] R10: ffffc9002e407e18 R11: ffff888108a38858 R12: ffffc9002e4610f8\\n[76612.998060] R13: ffff888108a38858 R14: 00007ffd1ae0ac78 R15: ffffc9002e4610c0\\n[76613.005303] FS:  00007f80b6f59740(0000) GS:ffff8897e0ec0000(0000) knlGS:0000000000000000\\n[76613.013517] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\n[76613.019349] CR2: ffffc8fc2e461108 CR3: 000000011e3ef001 CR4: 00000000007726f0\\n[76613.026595] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\\n[76613.033841] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\\n[76613.041086] PKRU: 55555554\\n[76613.043842] Call Trace:\\n[76613.046331]  \u003cTASK\u003e\\n[76613.048468]  ? __die+0x20/0x60\\n[76613.051581]  ? page_fault_oops+0x15a/0x450\\n[76613.055747]  ? search_extable+0x22/0x30\\n[76613.059649]  ? search_bpf_extables+0x5f/0x80\\n[76613.063988]  ? exc_page_fault+0xa9/0x140\\n[76613.067975]  ? asm_exc_page_fault+0x22/0x30\\n[76613.072229]  ? xsk_map_delete_elem+0x2d/0x60\\n[76613.076573]  ? xsk_map_delete_elem+0x23/0x60\\n[76613.080914]  __sys_bpf+0x19b7/0x23c0\\n[76613.084555]  __x64_sys_bpf+0x1a/0x20\\n[76613.088194]  do_syscall_64+0x37/0xb0\\n[76613.091832]  entry_SYSCALL_64_after_hwframe+0x4b/0x53\\n[76613.096962] RIP: 0033:0x7f80b6d1e88d\\n[76613.100592] Code: 5b 41 5c c3 66 0f 1f 84 00 00 00 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 73 b5 0f 00 f7 d8 64 89 01 48\\n[76613.119631] RSP: 002b:00007ffd1ae0ac68 EFLAGS: 00000206 ORIG_RAX: 0000000000000141\\n[76613.131330] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f80b6d1e88d\\n[76613.142632] RDX: 0000000000000098 RSI: 00007ffd1ae0ad20 RDI: 0000000000000003\\n[76613.153967] RBP: 00007ffd1ae0adc0 R08: 0000000000000000 R09: 0000000000000000\\n[76613.166030] R10: 00007f80b6f77040 R11: 0000000000000206 R12: 00007ffd1ae0aed8\\n[76613.177130] R13: 000055ddf42ce1e9 R14: 000055ddf42d0d98 R15: 00\\n---truncated---\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: xsk: se corrige la escritura en mapas OOB al eliminar elementos Jordy dice: \\\"En la funci\u00f3n xsk_map_delete_elem, un entero sin signo (map-\u0026gt;max_entries) se compara con un entero con signo controlado por el usuario (k). Debido a la conversi\u00f3n de tipo impl\u00edcita, un valor sin signo grande para map-\u0026gt;max_entries puede eludir la comprobaci\u00f3n de los l\u00edmites prevista: if (k \u0026gt;= map-\u0026gt;max_entries) return -EINVAL; Esto permite que k contenga un valor negativo (entre -2147483648 y -2), que luego se utiliza como un \u00edndice de matriz en m-\u0026gt;xsk_map[k], lo que da como resultado un acceso fuera de los l\u00edmites. spin_lock_bh(\u0026amp;m-\u0026gt;lock); map_entry = \u0026amp;m-\u0026gt;xsk_map[k]; // Entrada de mapa fuera de los l\u00edmites old_xs = unrcu_pointer(xchg(map_entry, NULL)); // Oob write if (old_xs) xsk_map_sock_delete(old_xs, map_entry); spin_unlock_bh(\u0026amp;m-\u0026gt;lock); La operaci\u00f3n xchg se puede utilizar para provocar una escritura fuera de los l\u00edmites. Adem\u00e1s, la map_entry no v\u00e1lida pasada a xsk_map_sock_delete puede provocar una mayor corrupci\u00f3n de la memoria. \\\" De hecho, da como resultado el siguiente error: [76612.897343] ERROR: no se puede gestionar la falla de p\u00e1gina para la direcci\u00f3n: ffffc8fc2e461108 [76612.904330] #PF: acceso de escritura del supervisor en modo kernel [76612.909639] #PF: error_code(0x0002) - p\u00e1gina no presente [76612.914855] PGD 0 P4D 0 [76612.917431] Ups: Ups: 0002 [#1] PREEMPT SMP [76612.921859] CPU: 11 UID: 0 PID: 10318 Comm: a.out No contaminado 6.12.0-rc1+ #470 [76612.929189] Nombre del hardware: Intel Corporation S2600WFT/S2600WFT, BIOS SE5C620.86B.02.01.0008.031920191559 19/03/2019 [76612.939781] RIP: 0010:xsk_map_delete_elem+0x2d/0x60 [76612.944738] C\u00f3digo: 00 00 41 54 55 53 48 63 2e 3b 6f 24 73 38 4c 8d a7 f8 00 00 00 48 89 fb 4c 89 e7 e8 2d bf 05 00 48 8d b4 eb 00 01 00 00 31 y siguientes \u0026lt;48\u0026gt; 87 3e 48 85 y siguientes 74 05 e8 16 y siguientes y siguientes y siguientes 4c 89 e7 e8 3e bc 05 00 31 [76612.963774] RSP: 0018:ffffc9002e407df8 EFLAGS: 00010246 [76612.969079] RAX: 0000000000000000 RBX: ffffc9002e461000 RCX: 0000000000000000 [76612.976323] RDX: 0000000000000001 RSI: ffffc8fc2e461108 RDI: 00000000000000000 [76612.983569] RBP: ffffffff80000001 R08: 0000000000000000 R09: 0000000000000007 [76612.990812] R10: ffffc9002e407e18 R11: ffff888108a38858 R12: ffffc9002e4610f8 [76612.998060] R13: ffff888108a38858 R14: 00007ffd1ae0ac78 R15: ffffc9002e4610c0 [76613.005303] FS: 00007f80b6f59740(0000) GS:ffff8897e0ec0000(0000) knlGS:0000000000000000 [76613.013517] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [76613.019349] CR2: ffffc8fc2e461108 CR3: 000000011e3ef001 CR4: 00000000007726f0 [76613.026595] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 000000000000000 [76613.033841] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [76613.041086] PKRU: 55555554 [76613.043842] Seguimiento de llamadas: [76613.046331]  [76613.048468] ? __die+0x20/0x60 [76613.051581] ? error_de_p\u00e1gina_oops+0x15a/0x450 [76613.055747] ? b\u00fasqueda_extable+0x22/0x30 [76613.059649] ? b\u00fasqueda_bpf_extables+0x5f/0x80 [76613.063988] ? error_de_p\u00e1gina_exc+0xa9/0x140 [76613.067975] ? error_de_p\u00e1gina_exc+0x22/0x30 [76613.072229] ? \u00bfxsk_map_delete_elem+0x2d/0x60 [76613.076573] ? xsk_map_delete_elem+0x23/0x60 [76613.080914] __sys_bpf+0x19b7/0x23c0 [76613.084555] __x64_sys_bpf+0x1a/0x20 [76613.088194] hacer_syscall_64+0x37/0xb0 [76613.091832] entrada_SYSCALL_64_after_hwframe+0x4b/0x53 [76613.096962] RIP: 0033:0x7f80b6d1e88d [76613.100592] C\u00f3digo: 5b 41 5c c3 66 0f 1f 84 00 00 00 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 \u0026lt;48\u0026gt; 3d 01 f0 ff ff 73 01 c3 48 8b 0d 73 b5 0f 00 f7 d8 64 89 01 48 [76613.119631] RSP: 002b:00007ffd1ae0ac68 EFLAGS: 00000206 ORIG_RAX: 0000000000000141 [76613.131330] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f80b6d1e88d [76613.142632] RDX: 000000000000000098 RSI: 00007ffd1ae0ad20 RDI: 0000000000000003 [76613.153967]  ---truncado---\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-787\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.18\",\"versionEndExcluding\":\"5.15.174\",\"matchCriteriaId\":\"A8151951-069A-4828-9C8E-5430FD2D7D67\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.120\",\"matchCriteriaId\":\"09AC6122-E2A4-40FE-9D33-268A1B2EC265\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.66\",\"matchCriteriaId\":\"29A976AD-B9AB-4A95-9F08-7669F8847EB9\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.5\",\"matchCriteriaId\":\"9501D045-7A94-42CA-8B03-821BE94A65B7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.13:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"62567B3C-6CEE-46D0-BC2E-B3717FBF7D13\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/32cd3db7de97c0c7a018756ce66244342fd583f0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/4d03f705e9d7aabebc6bfa5810f8aab6d176cbb7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d486b5741d987d3e0e6be4ac22cafdf94e6d1a47\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/ed08c93d5a9801cc8f224a046411fd603c538d07\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f8abd03f83d5fe81e76eb93e2c4373eb9f75fd8a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
  }
}


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