⬢ DragonFlyBSD Kernel Audit
DF-5377 / manifest.json
← back to finding ↓ download raw 
 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
{
  "finding_id": "DF-5377",
  "verdict": "reproduced",
  "impact": "dos",
  "confidence": "certain",
  "reproduce": {
    "build": "guest root, /root/targpwn: make KERNBUILDDIR=/usr/obj/usr/src/sys/X86_64_GENERIC (targsim.ko) && cc -O0 -g -o poc5377 poc5377.c",
    "run": "kldload ./targsim.ko; sleep 2; sysctl vm.pbuf_mem_count; ./poc5377 8; then ./poc5377 386 drain  (wedge demo)",
    "expected": "vm.pbuf_mem_count drops by exactly the cycle count (394 -> 386 after 8) and never recovers; drain mode takes it to 0 and a subsequent 'dd if=/dev/vbd0 of=/dev/null bs=64k count=1' sits unkillable in D0 on wchan wswbuf5 forever."
  },
  "kernel_refs": [
    "sys/bus/cam/scsi/scsi_target.c:828",
    "sys/bus/cam/scsi/scsi_target.c:541",
    "sys/bus/cam/scsi/scsi_target.c:973",
    "sys/bus/cam/cam_periph.c:643",
    "sys/vm/vm_pager.c:505"
  ],
  "artifacts": [
    "README.md", "VERDICT.md", "targsim.c", "Makefile", "poc5377.c",
    "build.sh", "run.sh", "build.log", "run.log", "run.drain.log",
    "run.patched.log", "fix.diff", "fix_build.log",
    "manifest.json", "verdict.json"
  ]
}