cve-2021-47185
Vulnerability from cvelistv5
Published
2024-04-10 18:56
Modified
2024-08-04 05:32
Severity
Summary
tty: tty_buffer: Fix the softlockup issue in flush_to_ldisc
References
SourceURLTags
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0380f643f3a7a61b0845cdc738959c2ad5735d61
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3968ddcf05fb4b9409cd1859feb06a5b0550a1c1
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4c1623651a0936ee197859824cdae6ebbd04d3ed
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4f300f47dbcf9c3d4b2ea76c8554c8f360400725
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5c34486f04700f1ba04907231dce0cc2705c2d7d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/77e9fed33056f2a88eba9dd4d2d5412f0c7d1f41
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b1ffc16ec05ae40d82b6e373322d62e9d6b54fbc
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d491c84df5c469dd9621863b6a770b3428137063
Impacted products
VendorProduct
LinuxLinux
LinuxLinux
Show details on NVD website

To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2021-47185",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-04-15T14:53:32.237242Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-06-04T17:14:18.411Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T05:32:07.394Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/0380f643f3a7a61b0845cdc738959c2ad5735d61"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/b1ffc16ec05ae40d82b6e373322d62e9d6b54fbc"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/4c1623651a0936ee197859824cdae6ebbd04d3ed"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/4f300f47dbcf9c3d4b2ea76c8554c8f360400725"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/d491c84df5c469dd9621863b6a770b3428137063"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/77e9fed33056f2a88eba9dd4d2d5412f0c7d1f41"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/5c34486f04700f1ba04907231dce0cc2705c2d7d"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/3968ddcf05fb4b9409cd1859feb06a5b0550a1c1"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/tty/tty_buffer.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "0380f643f3a7",
              "status": "affected",
              "version": "1da177e4c3f4",
              "versionType": "git"
            },
            {
              "lessThan": "b1ffc16ec05a",
              "status": "affected",
              "version": "1da177e4c3f4",
              "versionType": "git"
            },
            {
              "lessThan": "4c1623651a09",
              "status": "affected",
              "version": "1da177e4c3f4",
              "versionType": "git"
            },
            {
              "lessThan": "4f300f47dbcf",
              "status": "affected",
              "version": "1da177e4c3f4",
              "versionType": "git"
            },
            {
              "lessThan": "d491c84df5c4",
              "status": "affected",
              "version": "1da177e4c3f4",
              "versionType": "git"
            },
            {
              "lessThan": "77e9fed33056",
              "status": "affected",
              "version": "1da177e4c3f4",
              "versionType": "git"
            },
            {
              "lessThan": "5c34486f0470",
              "status": "affected",
              "version": "1da177e4c3f4",
              "versionType": "git"
            },
            {
              "lessThan": "3968ddcf05fb",
              "status": "affected",
              "version": "1da177e4c3f4",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/tty/tty_buffer.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThanOrEqual": "4.4.*",
              "status": "unaffected",
              "version": "4.4.293",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "4.9.*",
              "status": "unaffected",
              "version": "4.9.291",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "4.14.*",
              "status": "unaffected",
              "version": "4.14.256",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "4.19.*",
              "status": "unaffected",
              "version": "4.19.218",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.162",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.82",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.5",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.16",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntty: tty_buffer: Fix the softlockup issue in flush_to_ldisc\n\nWhen running ltp testcase(ltp/testcases/kernel/pty/pty04.c) with arm64, there is a soft lockup,\nwhich look like this one:\n\n  Workqueue: events_unbound flush_to_ldisc\n  Call trace:\n   dump_backtrace+0x0/0x1ec\n   show_stack+0x24/0x30\n   dump_stack+0xd0/0x128\n   panic+0x15c/0x374\n   watchdog_timer_fn+0x2b8/0x304\n   __run_hrtimer+0x88/0x2c0\n   __hrtimer_run_queues+0xa4/0x120\n   hrtimer_interrupt+0xfc/0x270\n   arch_timer_handler_phys+0x40/0x50\n   handle_percpu_devid_irq+0x94/0x220\n   __handle_domain_irq+0x88/0xf0\n   gic_handle_irq+0x84/0xfc\n   el1_irq+0xc8/0x180\n   slip_unesc+0x80/0x214 [slip]\n   tty_ldisc_receive_buf+0x64/0x80\n   tty_port_default_receive_buf+0x50/0x90\n   flush_to_ldisc+0xbc/0x110\n   process_one_work+0x1d4/0x4b0\n   worker_thread+0x180/0x430\n   kthread+0x11c/0x120\n\nIn the testcase pty04, The first process call the write syscall to send\ndata to the pty master. At the same time, the workqueue will do the\nflush_to_ldisc to pop data in a loop until there is no more data left.\nWhen the sender and workqueue running in different core, the sender sends\ndata fastly in full time which will result in workqueue doing work in loop\nfor a long time and occuring softlockup in flush_to_ldisc with kernel\nconfigured without preempt. So I add need_resched check and cond_resched\nin the flush_to_ldisc loop to avoid it."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-05-29T05:03:32.160Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/0380f643f3a7a61b0845cdc738959c2ad5735d61"
        },
        {
          "url": "https://git.kernel.org/stable/c/b1ffc16ec05ae40d82b6e373322d62e9d6b54fbc"
        },
        {
          "url": "https://git.kernel.org/stable/c/4c1623651a0936ee197859824cdae6ebbd04d3ed"
        },
        {
          "url": "https://git.kernel.org/stable/c/4f300f47dbcf9c3d4b2ea76c8554c8f360400725"
        },
        {
          "url": "https://git.kernel.org/stable/c/d491c84df5c469dd9621863b6a770b3428137063"
        },
        {
          "url": "https://git.kernel.org/stable/c/77e9fed33056f2a88eba9dd4d2d5412f0c7d1f41"
        },
        {
          "url": "https://git.kernel.org/stable/c/5c34486f04700f1ba04907231dce0cc2705c2d7d"
        },
        {
          "url": "https://git.kernel.org/stable/c/3968ddcf05fb4b9409cd1859feb06a5b0550a1c1"
        }
      ],
      "title": "tty: tty_buffer: Fix the softlockup issue in flush_to_ldisc",
      "x_generator": {
        "engine": "bippy-a5840b7849dd"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47185",
    "datePublished": "2024-04-10T18:56:25.671Z",
    "dateReserved": "2024-03-25T09:12:14.113Z",
    "dateUpdated": "2024-08-04T05:32:07.394Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47185\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-04-10T19:15:47.383\",\"lastModified\":\"2024-04-10T19:49:51.183\",\"vulnStatus\":\"Awaiting Analysis\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ntty: tty_buffer: Fix the softlockup issue in flush_to_ldisc\\n\\nWhen running ltp testcase(ltp/testcases/kernel/pty/pty04.c) with arm64, there is a soft lockup,\\nwhich look like this one:\\n\\n  Workqueue: events_unbound flush_to_ldisc\\n  Call trace:\\n   dump_backtrace+0x0/0x1ec\\n   show_stack+0x24/0x30\\n   dump_stack+0xd0/0x128\\n   panic+0x15c/0x374\\n   watchdog_timer_fn+0x2b8/0x304\\n   __run_hrtimer+0x88/0x2c0\\n   __hrtimer_run_queues+0xa4/0x120\\n   hrtimer_interrupt+0xfc/0x270\\n   arch_timer_handler_phys+0x40/0x50\\n   handle_percpu_devid_irq+0x94/0x220\\n   __handle_domain_irq+0x88/0xf0\\n   gic_handle_irq+0x84/0xfc\\n   el1_irq+0xc8/0x180\\n   slip_unesc+0x80/0x214 [slip]\\n   tty_ldisc_receive_buf+0x64/0x80\\n   tty_port_default_receive_buf+0x50/0x90\\n   flush_to_ldisc+0xbc/0x110\\n   process_one_work+0x1d4/0x4b0\\n   worker_thread+0x180/0x430\\n   kthread+0x11c/0x120\\n\\nIn the testcase pty04, The first process call the write syscall to send\\ndata to the pty master. At the same time, the workqueue will do the\\nflush_to_ldisc to pop data in a loop until there is no more data left.\\nWhen the sender and workqueue running in different core, the sender sends\\ndata fastly in full time which will result in workqueue doing work in loop\\nfor a long time and occuring softlockup in flush_to_ldisc with kernel\\nconfigured without preempt. So I add need_resched check and cond_resched\\nin the flush_to_ldisc loop to avoid it.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0380f643f3a7a61b0845cdc738959c2ad5735d61\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3968ddcf05fb4b9409cd1859feb06a5b0550a1c1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4c1623651a0936ee197859824cdae6ebbd04d3ed\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4f300f47dbcf9c3d4b2ea76c8554c8f360400725\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5c34486f04700f1ba04907231dce0cc2705c2d7d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/77e9fed33056f2a88eba9dd4d2d5412f0c7d1f41\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b1ffc16ec05ae40d82b6e373322d62e9d6b54fbc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d491c84df5c469dd9621863b6a770b3428137063\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.