cve-2024-40998
Vulnerability from cvelistv5
Published
2024-07-12 12:37
Modified
2024-11-05 09:34
Severity ?
Summary
ext4: fix uninitialized ratelimit_state->lock access in __ext4_fill_super()
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/23afcd52af06880c6c913a0ad99022b8937b575c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/645267906944a9aeec9d5c56ee24a9096a288798
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b4b4fda34e535756f9e774fb2d09c4537b7dfd1c
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

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                "id": "CVE-2024-40998",
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    "cna": {
      "affected": [
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ext4/super.c"
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix uninitialized ratelimit_state-\u003elock access in __ext4_fill_super()\n\nIn the following concurrency we will access the uninitialized rs-\u003elock:\n\next4_fill_super\n  ext4_register_sysfs\n   // sysfs registered msg_ratelimit_interval_ms\n                             // Other processes modify rs-\u003einterval to\n                             // non-zero via msg_ratelimit_interval_ms\n  ext4_orphan_cleanup\n    ext4_msg(sb, KERN_INFO, \"Errors on filesystem, \"\n      __ext4_msg\n        ___ratelimit(\u0026(EXT4_SB(sb)-\u003es_msg_ratelimit_state)\n          if (!rs-\u003einterval)  // do nothing if interval is 0\n            return 1;\n          raw_spin_trylock_irqsave(\u0026rs-\u003elock, flags)\n            raw_spin_trylock(lock)\n              _raw_spin_trylock\n                __raw_spin_trylock\n                  spin_acquire(\u0026lock-\u003edep_map, 0, 1, _RET_IP_)\n                    lock_acquire\n                      __lock_acquire\n                        register_lock_class\n                          assign_lock_key\n                            dump_stack();\n  ratelimit_state_init(\u0026sbi-\u003es_msg_ratelimit_state, 5 * HZ, 10);\n    raw_spin_lock_init(\u0026rs-\u003elock);\n    // init rs-\u003elock here\n\nand get the following dump_stack:\n\n=========================================================\nINFO: trying to register non-static key.\nThe code is fine but needs lockdep annotation, or maybe\nyou didn\u0027t initialize this object before use?\nturning off the locking correctness validator.\nCPU: 12 PID: 753 Comm: mount Tainted: G E 6.7.0-rc6-next-20231222 #504\n[...]\nCall Trace:\n dump_stack_lvl+0xc5/0x170\n dump_stack+0x18/0x30\n register_lock_class+0x740/0x7c0\n __lock_acquire+0x69/0x13a0\n lock_acquire+0x120/0x450\n _raw_spin_trylock+0x98/0xd0\n ___ratelimit+0xf6/0x220\n __ext4_msg+0x7f/0x160 [ext4]\n ext4_orphan_cleanup+0x665/0x740 [ext4]\n __ext4_fill_super+0x21ea/0x2b10 [ext4]\n ext4_fill_super+0x14d/0x360 [ext4]\n[...]\n=========================================================\n\nNormally interval is 0 until s_msg_ratelimit_state is initialized, so\n___ratelimit() does nothing. But registering sysfs precedes initializing\nrs-\u003elock, so it is possible to change rs-\u003einterval to a non-zero value\nvia the msg_ratelimit_interval_ms interface of sysfs while rs-\u003elock is\nuninitialized, and then a call to ext4_msg triggers the problem by\naccessing an uninitialized rs-\u003elock. Therefore register sysfs after all\ninitializations are complete to avoid such problems."
        }
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        "dateUpdated": "2024-11-05T09:34:45.822Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          "url": "https://git.kernel.org/stable/c/23afcd52af06880c6c913a0ad99022b8937b575c"
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      "title": "ext4: fix uninitialized ratelimit_state-\u003elock access in __ext4_fill_super()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2024-40998",
    "datePublished": "2024-07-12T12:37:39.823Z",
    "dateReserved": "2024-07-12T12:17:45.607Z",
    "dateUpdated": "2024-11-05T09:34:45.822Z",
    "state": "PUBLISHED"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-40998\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-07-12T13:15:20.857\",\"lastModified\":\"2024-07-12T16:34:58.687\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\next4: fix uninitialized ratelimit_state-\u003elock access in __ext4_fill_super()\\n\\nIn the following concurrency we will access the uninitialized rs-\u003elock:\\n\\next4_fill_super\\n  ext4_register_sysfs\\n   // sysfs registered msg_ratelimit_interval_ms\\n                             // Other processes modify rs-\u003einterval to\\n                             // non-zero via msg_ratelimit_interval_ms\\n  ext4_orphan_cleanup\\n    ext4_msg(sb, KERN_INFO, \\\"Errors on filesystem, \\\"\\n      __ext4_msg\\n        ___ratelimit(\u0026(EXT4_SB(sb)-\u003es_msg_ratelimit_state)\\n          if (!rs-\u003einterval)  // do nothing if interval is 0\\n            return 1;\\n          raw_spin_trylock_irqsave(\u0026rs-\u003elock, flags)\\n            raw_spin_trylock(lock)\\n              _raw_spin_trylock\\n                __raw_spin_trylock\\n                  spin_acquire(\u0026lock-\u003edep_map, 0, 1, _RET_IP_)\\n                    lock_acquire\\n                      __lock_acquire\\n                        register_lock_class\\n                          assign_lock_key\\n                            dump_stack();\\n  ratelimit_state_init(\u0026sbi-\u003es_msg_ratelimit_state, 5 * HZ, 10);\\n    raw_spin_lock_init(\u0026rs-\u003elock);\\n    // init rs-\u003elock here\\n\\nand get the following dump_stack:\\n\\n=========================================================\\nINFO: trying to register non-static key.\\nThe code is fine but needs lockdep annotation, or maybe\\nyou didn\u0027t initialize this object before use?\\nturning off the locking correctness validator.\\nCPU: 12 PID: 753 Comm: mount Tainted: G E 6.7.0-rc6-next-20231222 #504\\n[...]\\nCall Trace:\\n dump_stack_lvl+0xc5/0x170\\n dump_stack+0x18/0x30\\n register_lock_class+0x740/0x7c0\\n __lock_acquire+0x69/0x13a0\\n lock_acquire+0x120/0x450\\n _raw_spin_trylock+0x98/0xd0\\n ___ratelimit+0xf6/0x220\\n __ext4_msg+0x7f/0x160 [ext4]\\n ext4_orphan_cleanup+0x665/0x740 [ext4]\\n __ext4_fill_super+0x21ea/0x2b10 [ext4]\\n ext4_fill_super+0x14d/0x360 [ext4]\\n[...]\\n=========================================================\\n\\nNormally interval is 0 until s_msg_ratelimit_state is initialized, so\\n___ratelimit() does nothing. But registering sysfs precedes initializing\\nrs-\u003elock, so it is possible to change rs-\u003einterval to a non-zero value\\nvia the msg_ratelimit_interval_ms interface of sysfs while rs-\u003elock is\\nuninitialized, and then a call to ext4_msg triggers the problem by\\naccessing an uninitialized rs-\u003elock. Therefore register sysfs after all\\ninitializations are complete to avoid such problems.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/23afcd52af06880c6c913a0ad99022b8937b575c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/645267906944a9aeec9d5c56ee24a9096a288798\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b4b4fda34e535756f9e774fb2d09c4537b7dfd1c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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