gsd-2024-26904
Vulnerability from gsd
Modified
2024-02-20 06:02
Details
In the Linux kernel, the following vulnerability has been resolved: btrfs: fix data race at btrfs_use_block_rsv() when accessing block reserve At btrfs_use_block_rsv() we read the size of a block reserve without locking its spinlock, which makes KCSAN complain because the size of a block reserve is always updated while holding its spinlock. The report from KCSAN is the following: [653.313148] BUG: KCSAN: data-race in btrfs_update_delayed_refs_rsv [btrfs] / btrfs_use_block_rsv [btrfs] [653.314755] read to 0x000000017f5871b8 of 8 bytes by task 7519 on cpu 0: [653.314779] btrfs_use_block_rsv+0xe4/0x2f8 [btrfs] [653.315606] btrfs_alloc_tree_block+0xdc/0x998 [btrfs] [653.316421] btrfs_force_cow_block+0x220/0xe38 [btrfs] [653.317242] btrfs_cow_block+0x1ac/0x568 [btrfs] [653.318060] btrfs_search_slot+0xda2/0x19b8 [btrfs] [653.318879] btrfs_del_csums+0x1dc/0x798 [btrfs] [653.319702] __btrfs_free_extent.isra.0+0xc24/0x2028 [btrfs] [653.320538] __btrfs_run_delayed_refs+0xd3c/0x2390 [btrfs] [653.321340] btrfs_run_delayed_refs+0xae/0x290 [btrfs] [653.322140] flush_space+0x5e4/0x718 [btrfs] [653.322958] btrfs_preempt_reclaim_metadata_space+0x102/0x2f8 [btrfs] [653.323781] process_one_work+0x3b6/0x838 [653.323800] worker_thread+0x75e/0xb10 [653.323817] kthread+0x21a/0x230 [653.323836] __ret_from_fork+0x6c/0xb8 [653.323855] ret_from_fork+0xa/0x30 [653.323887] write to 0x000000017f5871b8 of 8 bytes by task 576 on cpu 3: [653.323906] btrfs_update_delayed_refs_rsv+0x1a4/0x250 [btrfs] [653.324699] btrfs_add_delayed_data_ref+0x468/0x6d8 [btrfs] [653.325494] btrfs_free_extent+0x76/0x120 [btrfs] [653.326280] __btrfs_mod_ref+0x6a8/0x6b8 [btrfs] [653.327064] btrfs_dec_ref+0x50/0x70 [btrfs] [653.327849] walk_up_proc+0x236/0xa50 [btrfs] [653.328633] walk_up_tree+0x21c/0x448 [btrfs] [653.329418] btrfs_drop_snapshot+0x802/0x1328 [btrfs] [653.330205] btrfs_clean_one_deleted_snapshot+0x184/0x238 [btrfs] [653.330995] cleaner_kthread+0x2b0/0x2f0 [btrfs] [653.331781] kthread+0x21a/0x230 [653.331800] __ret_from_fork+0x6c/0xb8 [653.331818] ret_from_fork+0xa/0x30 So add a helper to get the size of a block reserve while holding the lock. Reading the field while holding the lock instead of using the data_race() annotation is used in order to prevent load tearing.
Aliases



{
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2024-26904"
      ],
      "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix data race at btrfs_use_block_rsv() when accessing block reserve\n\nAt btrfs_use_block_rsv() we read the size of a block reserve without\nlocking its spinlock, which makes KCSAN complain because the size of a\nblock reserve is always updated while holding its spinlock. The report\nfrom KCSAN is the following:\n\n  [653.313148] BUG: KCSAN: data-race in btrfs_update_delayed_refs_rsv [btrfs] / btrfs_use_block_rsv [btrfs]\n\n  [653.314755] read to 0x000000017f5871b8 of 8 bytes by task 7519 on cpu 0:\n  [653.314779]  btrfs_use_block_rsv+0xe4/0x2f8 [btrfs]\n  [653.315606]  btrfs_alloc_tree_block+0xdc/0x998 [btrfs]\n  [653.316421]  btrfs_force_cow_block+0x220/0xe38 [btrfs]\n  [653.317242]  btrfs_cow_block+0x1ac/0x568 [btrfs]\n  [653.318060]  btrfs_search_slot+0xda2/0x19b8 [btrfs]\n  [653.318879]  btrfs_del_csums+0x1dc/0x798 [btrfs]\n  [653.319702]  __btrfs_free_extent.isra.0+0xc24/0x2028 [btrfs]\n  [653.320538]  __btrfs_run_delayed_refs+0xd3c/0x2390 [btrfs]\n  [653.321340]  btrfs_run_delayed_refs+0xae/0x290 [btrfs]\n  [653.322140]  flush_space+0x5e4/0x718 [btrfs]\n  [653.322958]  btrfs_preempt_reclaim_metadata_space+0x102/0x2f8 [btrfs]\n  [653.323781]  process_one_work+0x3b6/0x838\n  [653.323800]  worker_thread+0x75e/0xb10\n  [653.323817]  kthread+0x21a/0x230\n  [653.323836]  __ret_from_fork+0x6c/0xb8\n  [653.323855]  ret_from_fork+0xa/0x30\n\n  [653.323887] write to 0x000000017f5871b8 of 8 bytes by task 576 on cpu 3:\n  [653.323906]  btrfs_update_delayed_refs_rsv+0x1a4/0x250 [btrfs]\n  [653.324699]  btrfs_add_delayed_data_ref+0x468/0x6d8 [btrfs]\n  [653.325494]  btrfs_free_extent+0x76/0x120 [btrfs]\n  [653.326280]  __btrfs_mod_ref+0x6a8/0x6b8 [btrfs]\n  [653.327064]  btrfs_dec_ref+0x50/0x70 [btrfs]\n  [653.327849]  walk_up_proc+0x236/0xa50 [btrfs]\n  [653.328633]  walk_up_tree+0x21c/0x448 [btrfs]\n  [653.329418]  btrfs_drop_snapshot+0x802/0x1328 [btrfs]\n  [653.330205]  btrfs_clean_one_deleted_snapshot+0x184/0x238 [btrfs]\n  [653.330995]  cleaner_kthread+0x2b0/0x2f0 [btrfs]\n  [653.331781]  kthread+0x21a/0x230\n  [653.331800]  __ret_from_fork+0x6c/0xb8\n  [653.331818]  ret_from_fork+0xa/0x30\n\nSo add a helper to get the size of a block reserve while holding the lock.\nReading the field while holding the lock instead of using the data_race()\nannotation is used in order to prevent load tearing.",
      "id": "GSD-2024-26904",
      "modified": "2024-02-20T06:02:29.176425Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "cve@kernel.org",
        "ID": "CVE-2024-26904",
        "STATE": "PUBLIC"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "Linux",
                    "version": {
                      "version_data": [
                        {
                          "version_affected": "\u003c",
                          "version_name": "1da177e4c3f4",
                          "version_value": "2daa2a8e895e"
                        },
                        {
                          "version_value": "not down converted",
                          "x_cve_json_5_version_data": {
                            "defaultStatus": "affected",
                            "versions": [
                              {
                                "lessThanOrEqual": "5.4.*",
                                "status": "unaffected",
                                "version": "5.4.273",
                                "versionType": "custom"
                              },
                              {
                                "lessThanOrEqual": "6.1.*",
                                "status": "unaffected",
                                "version": "6.1.83",
                                "versionType": "custom"
                              },
                              {
                                "lessThanOrEqual": "6.6.*",
                                "status": "unaffected",
                                "version": "6.6.23",
                                "versionType": "custom"
                              },
                              {
                                "lessThanOrEqual": "6.7.*",
                                "status": "unaffected",
                                "version": "6.7.11",
                                "versionType": "custom"
                              },
                              {
                                "lessThanOrEqual": "*",
                                "status": "unaffected",
                                "version": "6.8",
                                "versionType": "original_commit_for_fix"
                              }
                            ]
                          }
                        }
                      ]
                    }
                  }
                ]
              },
              "vendor_name": "Linux"
            }
          ]
        }
      },
      "data_format": "MITRE",
      "data_type": "CVE",
      "data_version": "4.0",
      "description": {
        "description_data": [
          {
            "lang": "eng",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix data race at btrfs_use_block_rsv() when accessing block reserve\n\nAt btrfs_use_block_rsv() we read the size of a block reserve without\nlocking its spinlock, which makes KCSAN complain because the size of a\nblock reserve is always updated while holding its spinlock. The report\nfrom KCSAN is the following:\n\n  [653.313148] BUG: KCSAN: data-race in btrfs_update_delayed_refs_rsv [btrfs] / btrfs_use_block_rsv [btrfs]\n\n  [653.314755] read to 0x000000017f5871b8 of 8 bytes by task 7519 on cpu 0:\n  [653.314779]  btrfs_use_block_rsv+0xe4/0x2f8 [btrfs]\n  [653.315606]  btrfs_alloc_tree_block+0xdc/0x998 [btrfs]\n  [653.316421]  btrfs_force_cow_block+0x220/0xe38 [btrfs]\n  [653.317242]  btrfs_cow_block+0x1ac/0x568 [btrfs]\n  [653.318060]  btrfs_search_slot+0xda2/0x19b8 [btrfs]\n  [653.318879]  btrfs_del_csums+0x1dc/0x798 [btrfs]\n  [653.319702]  __btrfs_free_extent.isra.0+0xc24/0x2028 [btrfs]\n  [653.320538]  __btrfs_run_delayed_refs+0xd3c/0x2390 [btrfs]\n  [653.321340]  btrfs_run_delayed_refs+0xae/0x290 [btrfs]\n  [653.322140]  flush_space+0x5e4/0x718 [btrfs]\n  [653.322958]  btrfs_preempt_reclaim_metadata_space+0x102/0x2f8 [btrfs]\n  [653.323781]  process_one_work+0x3b6/0x838\n  [653.323800]  worker_thread+0x75e/0xb10\n  [653.323817]  kthread+0x21a/0x230\n  [653.323836]  __ret_from_fork+0x6c/0xb8\n  [653.323855]  ret_from_fork+0xa/0x30\n\n  [653.323887] write to 0x000000017f5871b8 of 8 bytes by task 576 on cpu 3:\n  [653.323906]  btrfs_update_delayed_refs_rsv+0x1a4/0x250 [btrfs]\n  [653.324699]  btrfs_add_delayed_data_ref+0x468/0x6d8 [btrfs]\n  [653.325494]  btrfs_free_extent+0x76/0x120 [btrfs]\n  [653.326280]  __btrfs_mod_ref+0x6a8/0x6b8 [btrfs]\n  [653.327064]  btrfs_dec_ref+0x50/0x70 [btrfs]\n  [653.327849]  walk_up_proc+0x236/0xa50 [btrfs]\n  [653.328633]  walk_up_tree+0x21c/0x448 [btrfs]\n  [653.329418]  btrfs_drop_snapshot+0x802/0x1328 [btrfs]\n  [653.330205]  btrfs_clean_one_deleted_snapshot+0x184/0x238 [btrfs]\n  [653.330995]  cleaner_kthread+0x2b0/0x2f0 [btrfs]\n  [653.331781]  kthread+0x21a/0x230\n  [653.331800]  __ret_from_fork+0x6c/0xb8\n  [653.331818]  ret_from_fork+0xa/0x30\n\nSo add a helper to get the size of a block reserve while holding the lock.\nReading the field while holding the lock instead of using the data_race()\nannotation is used in order to prevent load tearing."
          }
        ]
      },
      "generator": {
        "engine": "bippy-d175d3acf727"
      },
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "lang": "eng",
                "value": "n/a"
              }
            ]
          }
        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://git.kernel.org/stable/c/2daa2a8e895e6dc2395f8628c011bcf1e019040d",
            "refsource": "MISC",
            "url": "https://git.kernel.org/stable/c/2daa2a8e895e6dc2395f8628c011bcf1e019040d"
          },
          {
            "name": "https://git.kernel.org/stable/c/ab1be3f1aa7799f99155488c28eacaef65eb68fb",
            "refsource": "MISC",
            "url": "https://git.kernel.org/stable/c/ab1be3f1aa7799f99155488c28eacaef65eb68fb"
          },
          {
            "name": "https://git.kernel.org/stable/c/f6d4d29a12655b42a13cec038c2902bb7efc50ed",
            "refsource": "MISC",
            "url": "https://git.kernel.org/stable/c/f6d4d29a12655b42a13cec038c2902bb7efc50ed"
          },
          {
            "name": "https://git.kernel.org/stable/c/7e9422d35d574b646269ca46010a835ca074b310",
            "refsource": "MISC",
            "url": "https://git.kernel.org/stable/c/7e9422d35d574b646269ca46010a835ca074b310"
          },
          {
            "name": "https://git.kernel.org/stable/c/c7bb26b847e5b97814f522686068c5628e2b3646",
            "refsource": "MISC",
            "url": "https://git.kernel.org/stable/c/c7bb26b847e5b97814f522686068c5628e2b3646"
          }
        ]
      }
    },
    "nvd.nist.gov": {
      "cve": {
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix data race at btrfs_use_block_rsv() when accessing block reserve\n\nAt btrfs_use_block_rsv() we read the size of a block reserve without\nlocking its spinlock, which makes KCSAN complain because the size of a\nblock reserve is always updated while holding its spinlock. The report\nfrom KCSAN is the following:\n\n  [653.313148] BUG: KCSAN: data-race in btrfs_update_delayed_refs_rsv [btrfs] / btrfs_use_block_rsv [btrfs]\n\n  [653.314755] read to 0x000000017f5871b8 of 8 bytes by task 7519 on cpu 0:\n  [653.314779]  btrfs_use_block_rsv+0xe4/0x2f8 [btrfs]\n  [653.315606]  btrfs_alloc_tree_block+0xdc/0x998 [btrfs]\n  [653.316421]  btrfs_force_cow_block+0x220/0xe38 [btrfs]\n  [653.317242]  btrfs_cow_block+0x1ac/0x568 [btrfs]\n  [653.318060]  btrfs_search_slot+0xda2/0x19b8 [btrfs]\n  [653.318879]  btrfs_del_csums+0x1dc/0x798 [btrfs]\n  [653.319702]  __btrfs_free_extent.isra.0+0xc24/0x2028 [btrfs]\n  [653.320538]  __btrfs_run_delayed_refs+0xd3c/0x2390 [btrfs]\n  [653.321340]  btrfs_run_delayed_refs+0xae/0x290 [btrfs]\n  [653.322140]  flush_space+0x5e4/0x718 [btrfs]\n  [653.322958]  btrfs_preempt_reclaim_metadata_space+0x102/0x2f8 [btrfs]\n  [653.323781]  process_one_work+0x3b6/0x838\n  [653.323800]  worker_thread+0x75e/0xb10\n  [653.323817]  kthread+0x21a/0x230\n  [653.323836]  __ret_from_fork+0x6c/0xb8\n  [653.323855]  ret_from_fork+0xa/0x30\n\n  [653.323887] write to 0x000000017f5871b8 of 8 bytes by task 576 on cpu 3:\n  [653.323906]  btrfs_update_delayed_refs_rsv+0x1a4/0x250 [btrfs]\n  [653.324699]  btrfs_add_delayed_data_ref+0x468/0x6d8 [btrfs]\n  [653.325494]  btrfs_free_extent+0x76/0x120 [btrfs]\n  [653.326280]  __btrfs_mod_ref+0x6a8/0x6b8 [btrfs]\n  [653.327064]  btrfs_dec_ref+0x50/0x70 [btrfs]\n  [653.327849]  walk_up_proc+0x236/0xa50 [btrfs]\n  [653.328633]  walk_up_tree+0x21c/0x448 [btrfs]\n  [653.329418]  btrfs_drop_snapshot+0x802/0x1328 [btrfs]\n  [653.330205]  btrfs_clean_one_deleted_snapshot+0x184/0x238 [btrfs]\n  [653.330995]  cleaner_kthread+0x2b0/0x2f0 [btrfs]\n  [653.331781]  kthread+0x21a/0x230\n  [653.331800]  __ret_from_fork+0x6c/0xb8\n  [653.331818]  ret_from_fork+0xa/0x30\n\nSo add a helper to get the size of a block reserve while holding the lock.\nReading the field while holding the lock instead of using the data_race()\nannotation is used in order to prevent load tearing."
          }
        ],
        "id": "CVE-2024-26904",
        "lastModified": "2024-04-17T12:48:07.510",
        "metrics": {},
        "published": "2024-04-17T11:15:11.113",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/2daa2a8e895e6dc2395f8628c011bcf1e019040d"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/7e9422d35d574b646269ca46010a835ca074b310"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/ab1be3f1aa7799f99155488c28eacaef65eb68fb"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/c7bb26b847e5b97814f522686068c5628e2b3646"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f6d4d29a12655b42a13cec038c2902bb7efc50ed"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Awaiting Analysis"
      }
    }
  }
}


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