gsd-2024-26848
Vulnerability from gsd
Modified
2024-02-20 06:02
Details
In the Linux kernel, the following vulnerability has been resolved: afs: Fix endless loop in directory parsing If a directory has a block with only ".__afsXXXX" files in it (from uncompleted silly-rename), these .__afsXXXX files are skipped but without advancing the file position in the dir_context. This leads to afs_dir_iterate() repeating the block again and again. Fix this by making the code that skips the .__afsXXXX file also manually advance the file position. The symptoms are a soft lookup: watchdog: BUG: soft lockup - CPU#3 stuck for 52s! [check:5737] ... RIP: 0010:afs_dir_iterate_block+0x39/0x1fd ... ? watchdog_timer_fn+0x1a6/0x213 ... ? asm_sysvec_apic_timer_interrupt+0x16/0x20 ? afs_dir_iterate_block+0x39/0x1fd afs_dir_iterate+0x10a/0x148 afs_readdir+0x30/0x4a iterate_dir+0x93/0xd3 __do_sys_getdents64+0x6b/0xd4 This is almost certainly the actual fix for: https://bugzilla.kernel.org/show_bug.cgi?id=218496
Aliases



{
  "gsd": {
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      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
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      "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nafs: Fix endless loop in directory parsing\n\nIf a directory has a block with only \".__afsXXXX\" files in it (from\nuncompleted silly-rename), these .__afsXXXX files are skipped but without\nadvancing the file position in the dir_context.  This leads to\nafs_dir_iterate() repeating the block again and again.\n\nFix this by making the code that skips the .__afsXXXX file also manually\nadvance the file position.\n\nThe symptoms are a soft lookup:\n\n        watchdog: BUG: soft lockup - CPU#3 stuck for 52s! [check:5737]\n        ...\n        RIP: 0010:afs_dir_iterate_block+0x39/0x1fd\n        ...\n         ? watchdog_timer_fn+0x1a6/0x213\n        ...\n         ? asm_sysvec_apic_timer_interrupt+0x16/0x20\n         ? afs_dir_iterate_block+0x39/0x1fd\n         afs_dir_iterate+0x10a/0x148\n         afs_readdir+0x30/0x4a\n         iterate_dir+0x93/0xd3\n         __do_sys_getdents64+0x6b/0xd4\n\nThis is almost certainly the actual fix for:\n\n        https://bugzilla.kernel.org/show_bug.cgi?id=218496",
      "id": "GSD-2024-26848",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Awaiting Analysis"
      }
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  }
}


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