CVE-2022-48644 (GCVE-0-2022-48644)

Vulnerability from cvelistv5 – Published: 2024-04-28 13:00 – Updated: 2025-05-04 08:20
VLAI?
Title
net/sched: taprio: avoid disabling offload when it was never enabled
Summary
In the Linux kernel, the following vulnerability has been resolved: net/sched: taprio: avoid disabling offload when it was never enabled In an incredibly strange API design decision, qdisc->destroy() gets called even if qdisc->init() never succeeded, not exclusively since commit 87b60cfacf9f ("net_sched: fix error recovery at qdisc creation"), but apparently also earlier (in the case of qdisc_create_dflt()). The taprio qdisc does not fully acknowledge this when it attempts full offload, because it starts off with q->flags = TAPRIO_FLAGS_INVALID in taprio_init(), then it replaces q->flags with TCA_TAPRIO_ATTR_FLAGS parsed from netlink (in taprio_change(), tail called from taprio_init()). But in taprio_destroy(), we call taprio_disable_offload(), and this determines what to do based on FULL_OFFLOAD_IS_ENABLED(q->flags). But looking at the implementation of FULL_OFFLOAD_IS_ENABLED() (a bitwise check of bit 1 in q->flags), it is invalid to call this macro on q->flags when it contains TAPRIO_FLAGS_INVALID, because that is set to U32_MAX, and therefore FULL_OFFLOAD_IS_ENABLED() will return true on an invalid set of flags. As a result, it is possible to crash the kernel if user space forces an error between setting q->flags = TAPRIO_FLAGS_INVALID, and the calling of taprio_enable_offload(). This is because drivers do not expect the offload to be disabled when it was never enabled. The error that we force here is to attach taprio as a non-root qdisc, but instead as child of an mqprio root qdisc: $ tc qdisc add dev swp0 root handle 1: \ mqprio num_tc 8 map 0 1 2 3 4 5 6 7 \ queues 1@0 1@1 1@2 1@3 1@4 1@5 1@6 1@7 hw 0 $ tc qdisc replace dev swp0 parent 1:1 \ taprio num_tc 8 map 0 1 2 3 4 5 6 7 \ queues 1@0 1@1 1@2 1@3 1@4 1@5 1@6 1@7 base-time 0 \ sched-entry S 0x7f 990000 sched-entry S 0x80 100000 \ flags 0x0 clockid CLOCK_TAI Unable to handle kernel paging request at virtual address fffffffffffffff8 [fffffffffffffff8] pgd=0000000000000000, p4d=0000000000000000 Internal error: Oops: 96000004 [#1] PREEMPT SMP Call trace: taprio_dump+0x27c/0x310 vsc9959_port_setup_tc+0x1f4/0x460 felix_port_setup_tc+0x24/0x3c dsa_slave_setup_tc+0x54/0x27c taprio_disable_offload.isra.0+0x58/0xe0 taprio_destroy+0x80/0x104 qdisc_create+0x240/0x470 tc_modify_qdisc+0x1fc/0x6b0 rtnetlink_rcv_msg+0x12c/0x390 netlink_rcv_skb+0x5c/0x130 rtnetlink_rcv+0x1c/0x2c Fix this by keeping track of the operations we made, and undo the offload only if we actually did it. I've added "bool offloaded" inside a 4 byte hole between "int clockid" and "atomic64_t picos_per_byte". Now the first cache line looks like below: $ pahole -C taprio_sched net/sched/sch_taprio.o struct taprio_sched { struct Qdisc * * qdiscs; /* 0 8 */ struct Qdisc * root; /* 8 8 */ u32 flags; /* 16 4 */ enum tk_offsets tk_offset; /* 20 4 */ int clockid; /* 24 4 */ bool offloaded; /* 28 1 */ /* XXX 3 bytes hole, try to pack */ atomic64_t picos_per_byte; /* 32 0 */ /* XXX 8 bytes hole, try to pack */ spinlock_t current_entry_lock; /* 40 0 */ /* XXX 8 bytes hole, try to pack */ struct sched_entry * current_entry; /* 48 8 */ struct sched_gate_list * oper_sched; /* 56 8 */ /* --- cacheline 1 boundary (64 bytes) --- */
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 9c66d15646760eb8982242b4531c4d4fd36118fd , < d12a1eb07003e597077329767c6aa86a7e972c76 (git)
Affected: 9c66d15646760eb8982242b4531c4d4fd36118fd , < 586def6ebed195f3594a4884f7c5334d0e1ad1bb (git)
Affected: 9c66d15646760eb8982242b4531c4d4fd36118fd , < f58e43184226e5e9662088ccf1389e424a3a4cbd (git)
Affected: 9c66d15646760eb8982242b4531c4d4fd36118fd , < c7c9c7eb305ab8b4e93e4e4e1b78d8cfcbc26323 (git)
Affected: 9c66d15646760eb8982242b4531c4d4fd36118fd , < db46e3a88a09c5cf7e505664d01da7238cd56c92 (git)
Create a notification for this product.
    Linux Linux Affected: 5.4
Unaffected: 0 , < 5.4 (semver)
Unaffected: 5.4.215 , ≤ 5.4.* (semver)
Unaffected: 5.10.146 , ≤ 5.10.* (semver)
Unaffected: 5.15.71 , ≤ 5.15.* (semver)
Unaffected: 5.19.12 , ≤ 5.19.* (semver)
Unaffected: 6.0 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T15:17:55.454Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/d12a1eb07003e597077329767c6aa86a7e972c76"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/586def6ebed195f3594a4884f7c5334d0e1ad1bb"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/f58e43184226e5e9662088ccf1389e424a3a4cbd"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/c7c9c7eb305ab8b4e93e4e4e1b78d8cfcbc26323"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/db46e3a88a09c5cf7e505664d01da7238cd56c92"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2022-48644",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-09-10T15:46:17.630673Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-09-11T17:33:11.100Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/sched/sch_taprio.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "d12a1eb07003e597077329767c6aa86a7e972c76",
              "status": "affected",
              "version": "9c66d15646760eb8982242b4531c4d4fd36118fd",
              "versionType": "git"
            },
            {
              "lessThan": "586def6ebed195f3594a4884f7c5334d0e1ad1bb",
              "status": "affected",
              "version": "9c66d15646760eb8982242b4531c4d4fd36118fd",
              "versionType": "git"
            },
            {
              "lessThan": "f58e43184226e5e9662088ccf1389e424a3a4cbd",
              "status": "affected",
              "version": "9c66d15646760eb8982242b4531c4d4fd36118fd",
              "versionType": "git"
            },
            {
              "lessThan": "c7c9c7eb305ab8b4e93e4e4e1b78d8cfcbc26323",
              "status": "affected",
              "version": "9c66d15646760eb8982242b4531c4d4fd36118fd",
              "versionType": "git"
            },
            {
              "lessThan": "db46e3a88a09c5cf7e505664d01da7238cd56c92",
              "status": "affected",
              "version": "9c66d15646760eb8982242b4531c4d4fd36118fd",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/sched/sch_taprio.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.4"
            },
            {
              "lessThan": "5.4",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.215",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.146",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.71",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.19.*",
              "status": "unaffected",
              "version": "5.19.12",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.215",
                  "versionStartIncluding": "5.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.146",
                  "versionStartIncluding": "5.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.71",
                  "versionStartIncluding": "5.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.19.12",
                  "versionStartIncluding": "5.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.0",
                  "versionStartIncluding": "5.4",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: taprio: avoid disabling offload when it was never enabled\n\nIn an incredibly strange API design decision, qdisc-\u003edestroy() gets\ncalled even if qdisc-\u003einit() never succeeded, not exclusively since\ncommit 87b60cfacf9f (\"net_sched: fix error recovery at qdisc creation\"),\nbut apparently also earlier (in the case of qdisc_create_dflt()).\n\nThe taprio qdisc does not fully acknowledge this when it attempts full\noffload, because it starts off with q-\u003eflags = TAPRIO_FLAGS_INVALID in\ntaprio_init(), then it replaces q-\u003eflags with TCA_TAPRIO_ATTR_FLAGS\nparsed from netlink (in taprio_change(), tail called from taprio_init()).\n\nBut in taprio_destroy(), we call taprio_disable_offload(), and this\ndetermines what to do based on FULL_OFFLOAD_IS_ENABLED(q-\u003eflags).\n\nBut looking at the implementation of FULL_OFFLOAD_IS_ENABLED()\n(a bitwise check of bit 1 in q-\u003eflags), it is invalid to call this macro\non q-\u003eflags when it contains TAPRIO_FLAGS_INVALID, because that is set\nto U32_MAX, and therefore FULL_OFFLOAD_IS_ENABLED() will return true on\nan invalid set of flags.\n\nAs a result, it is possible to crash the kernel if user space forces an\nerror between setting q-\u003eflags = TAPRIO_FLAGS_INVALID, and the calling\nof taprio_enable_offload(). This is because drivers do not expect the\noffload to be disabled when it was never enabled.\n\nThe error that we force here is to attach taprio as a non-root qdisc,\nbut instead as child of an mqprio root qdisc:\n\n$ tc qdisc add dev swp0 root handle 1: \\\n\tmqprio num_tc 8 map 0 1 2 3 4 5 6 7 \\\n\tqueues 1@0 1@1 1@2 1@3 1@4 1@5 1@6 1@7 hw 0\n$ tc qdisc replace dev swp0 parent 1:1 \\\n\ttaprio num_tc 8 map 0 1 2 3 4 5 6 7 \\\n\tqueues 1@0 1@1 1@2 1@3 1@4 1@5 1@6 1@7 base-time 0 \\\n\tsched-entry S 0x7f 990000 sched-entry S 0x80 100000 \\\n\tflags 0x0 clockid CLOCK_TAI\nUnable to handle kernel paging request at virtual address fffffffffffffff8\n[fffffffffffffff8] pgd=0000000000000000, p4d=0000000000000000\nInternal error: Oops: 96000004 [#1] PREEMPT SMP\nCall trace:\n taprio_dump+0x27c/0x310\n vsc9959_port_setup_tc+0x1f4/0x460\n felix_port_setup_tc+0x24/0x3c\n dsa_slave_setup_tc+0x54/0x27c\n taprio_disable_offload.isra.0+0x58/0xe0\n taprio_destroy+0x80/0x104\n qdisc_create+0x240/0x470\n tc_modify_qdisc+0x1fc/0x6b0\n rtnetlink_rcv_msg+0x12c/0x390\n netlink_rcv_skb+0x5c/0x130\n rtnetlink_rcv+0x1c/0x2c\n\nFix this by keeping track of the operations we made, and undo the\noffload only if we actually did it.\n\nI\u0027ve added \"bool offloaded\" inside a 4 byte hole between \"int clockid\"\nand \"atomic64_t picos_per_byte\". Now the first cache line looks like\nbelow:\n\n$ pahole -C taprio_sched net/sched/sch_taprio.o\nstruct taprio_sched {\n        struct Qdisc * *           qdiscs;               /*     0     8 */\n        struct Qdisc *             root;                 /*     8     8 */\n        u32                        flags;                /*    16     4 */\n        enum tk_offsets            tk_offset;            /*    20     4 */\n        int                        clockid;              /*    24     4 */\n        bool                       offloaded;            /*    28     1 */\n\n        /* XXX 3 bytes hole, try to pack */\n\n        atomic64_t                 picos_per_byte;       /*    32     0 */\n\n        /* XXX 8 bytes hole, try to pack */\n\n        spinlock_t                 current_entry_lock;   /*    40     0 */\n\n        /* XXX 8 bytes hole, try to pack */\n\n        struct sched_entry *       current_entry;        /*    48     8 */\n        struct sched_gate_list *   oper_sched;           /*    56     8 */\n        /* --- cacheline 1 boundary (64 bytes) --- */"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T08:20:22.221Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d12a1eb07003e597077329767c6aa86a7e972c76"
        },
        {
          "url": "https://git.kernel.org/stable/c/586def6ebed195f3594a4884f7c5334d0e1ad1bb"
        },
        {
          "url": "https://git.kernel.org/stable/c/f58e43184226e5e9662088ccf1389e424a3a4cbd"
        },
        {
          "url": "https://git.kernel.org/stable/c/c7c9c7eb305ab8b4e93e4e4e1b78d8cfcbc26323"
        },
        {
          "url": "https://git.kernel.org/stable/c/db46e3a88a09c5cf7e505664d01da7238cd56c92"
        }
      ],
      "title": "net/sched: taprio: avoid disabling offload when it was never enabled",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-48644",
    "datePublished": "2024-04-28T13:00:07.584Z",
    "dateReserved": "2024-02-25T13:44:28.316Z",
    "dateUpdated": "2025-05-04T08:20:22.221Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/d12a1eb07003e597077329767c6aa86a7e972c76\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/586def6ebed195f3594a4884f7c5334d0e1ad1bb\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/f58e43184226e5e9662088ccf1389e424a3a4cbd\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/c7c9c7eb305ab8b4e93e4e4e1b78d8cfcbc26323\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/db46e3a88a09c5cf7e505664d01da7238cd56c92\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-03T15:17:55.454Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2022-48644\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-09-10T15:46:17.630673Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-09-11T12:42:15.095Z\"}}], \"cna\": {\"title\": \"net/sched: taprio: avoid disabling offload when it was never enabled\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"9c66d15646760eb8982242b4531c4d4fd36118fd\", \"lessThan\": \"d12a1eb07003e597077329767c6aa86a7e972c76\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"9c66d15646760eb8982242b4531c4d4fd36118fd\", \"lessThan\": \"586def6ebed195f3594a4884f7c5334d0e1ad1bb\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"9c66d15646760eb8982242b4531c4d4fd36118fd\", \"lessThan\": \"f58e43184226e5e9662088ccf1389e424a3a4cbd\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"9c66d15646760eb8982242b4531c4d4fd36118fd\", \"lessThan\": \"c7c9c7eb305ab8b4e93e4e4e1b78d8cfcbc26323\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"9c66d15646760eb8982242b4531c4d4fd36118fd\", \"lessThan\": \"db46e3a88a09c5cf7e505664d01da7238cd56c92\", \"versionType\": \"git\"}], \"programFiles\": [\"net/sched/sch_taprio.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.4\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.4\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.4.215\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.146\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.71\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"5.19.12\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.19.*\"}, {\"status\": \"unaffected\", \"version\": \"6.0\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/sched/sch_taprio.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/d12a1eb07003e597077329767c6aa86a7e972c76\"}, {\"url\": \"https://git.kernel.org/stable/c/586def6ebed195f3594a4884f7c5334d0e1ad1bb\"}, {\"url\": \"https://git.kernel.org/stable/c/f58e43184226e5e9662088ccf1389e424a3a4cbd\"}, {\"url\": \"https://git.kernel.org/stable/c/c7c9c7eb305ab8b4e93e4e4e1b78d8cfcbc26323\"}, {\"url\": \"https://git.kernel.org/stable/c/db46e3a88a09c5cf7e505664d01da7238cd56c92\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet/sched: taprio: avoid disabling offload when it was never enabled\\n\\nIn an incredibly strange API design decision, qdisc-\u003edestroy() gets\\ncalled even if qdisc-\u003einit() never succeeded, not exclusively since\\ncommit 87b60cfacf9f (\\\"net_sched: fix error recovery at qdisc creation\\\"),\\nbut apparently also earlier (in the case of qdisc_create_dflt()).\\n\\nThe taprio qdisc does not fully acknowledge this when it attempts full\\noffload, because it starts off with q-\u003eflags = TAPRIO_FLAGS_INVALID in\\ntaprio_init(), then it replaces q-\u003eflags with TCA_TAPRIO_ATTR_FLAGS\\nparsed from netlink (in taprio_change(), tail called from taprio_init()).\\n\\nBut in taprio_destroy(), we call taprio_disable_offload(), and this\\ndetermines what to do based on FULL_OFFLOAD_IS_ENABLED(q-\u003eflags).\\n\\nBut looking at the implementation of FULL_OFFLOAD_IS_ENABLED()\\n(a bitwise check of bit 1 in q-\u003eflags), it is invalid to call this macro\\non q-\u003eflags when it contains TAPRIO_FLAGS_INVALID, because that is set\\nto U32_MAX, and therefore FULL_OFFLOAD_IS_ENABLED() will return true on\\nan invalid set of flags.\\n\\nAs a result, it is possible to crash the kernel if user space forces an\\nerror between setting q-\u003eflags = TAPRIO_FLAGS_INVALID, and the calling\\nof taprio_enable_offload(). This is because drivers do not expect the\\noffload to be disabled when it was never enabled.\\n\\nThe error that we force here is to attach taprio as a non-root qdisc,\\nbut instead as child of an mqprio root qdisc:\\n\\n$ tc qdisc add dev swp0 root handle 1: \\\\\\n\\tmqprio num_tc 8 map 0 1 2 3 4 5 6 7 \\\\\\n\\tqueues 1@0 1@1 1@2 1@3 1@4 1@5 1@6 1@7 hw 0\\n$ tc qdisc replace dev swp0 parent 1:1 \\\\\\n\\ttaprio num_tc 8 map 0 1 2 3 4 5 6 7 \\\\\\n\\tqueues 1@0 1@1 1@2 1@3 1@4 1@5 1@6 1@7 base-time 0 \\\\\\n\\tsched-entry S 0x7f 990000 sched-entry S 0x80 100000 \\\\\\n\\tflags 0x0 clockid CLOCK_TAI\\nUnable to handle kernel paging request at virtual address fffffffffffffff8\\n[fffffffffffffff8] pgd=0000000000000000, p4d=0000000000000000\\nInternal error: Oops: 96000004 [#1] PREEMPT SMP\\nCall trace:\\n taprio_dump+0x27c/0x310\\n vsc9959_port_setup_tc+0x1f4/0x460\\n felix_port_setup_tc+0x24/0x3c\\n dsa_slave_setup_tc+0x54/0x27c\\n taprio_disable_offload.isra.0+0x58/0xe0\\n taprio_destroy+0x80/0x104\\n qdisc_create+0x240/0x470\\n tc_modify_qdisc+0x1fc/0x6b0\\n rtnetlink_rcv_msg+0x12c/0x390\\n netlink_rcv_skb+0x5c/0x130\\n rtnetlink_rcv+0x1c/0x2c\\n\\nFix this by keeping track of the operations we made, and undo the\\noffload only if we actually did it.\\n\\nI\u0027ve added \\\"bool offloaded\\\" inside a 4 byte hole between \\\"int clockid\\\"\\nand \\\"atomic64_t picos_per_byte\\\". Now the first cache line looks like\\nbelow:\\n\\n$ pahole -C taprio_sched net/sched/sch_taprio.o\\nstruct taprio_sched {\\n        struct Qdisc * *           qdiscs;               /*     0     8 */\\n        struct Qdisc *             root;                 /*     8     8 */\\n        u32                        flags;                /*    16     4 */\\n        enum tk_offsets            tk_offset;            /*    20     4 */\\n        int                        clockid;              /*    24     4 */\\n        bool                       offloaded;            /*    28     1 */\\n\\n        /* XXX 3 bytes hole, try to pack */\\n\\n        atomic64_t                 picos_per_byte;       /*    32     0 */\\n\\n        /* XXX 8 bytes hole, try to pack */\\n\\n        spinlock_t                 current_entry_lock;   /*    40     0 */\\n\\n        /* XXX 8 bytes hole, try to pack */\\n\\n        struct sched_entry *       current_entry;        /*    48     8 */\\n        struct sched_gate_list *   oper_sched;           /*    56     8 */\\n        /* --- cacheline 1 boundary (64 bytes) --- */\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.215\", \"versionStartIncluding\": \"5.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.146\", \"versionStartIncluding\": \"5.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.71\", \"versionStartIncluding\": \"5.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.19.12\", \"versionStartIncluding\": \"5.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.0\", \"versionStartIncluding\": \"5.4\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T08:20:22.221Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2022-48644\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T08:20:22.221Z\", \"dateReserved\": \"2024-02-25T13:44:28.316Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-04-28T13:00:07.584Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • 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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.