CVE-2021-47337 (GCVE-0-2021-47337)
Vulnerability from cvelistv5
Published
2024-05-21 14:35
Modified
2025-05-04 07:08
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: scsi: core: Fix bad pointer dereference when ehandler kthread is invalid Commit 66a834d09293 ("scsi: core: Fix error handling of scsi_host_alloc()") changed the allocation logic to call put_device() to perform host cleanup with the assumption that IDA removal and stopping the kthread would properly be performed in scsi_host_dev_release(). However, in the unlikely case that the error handler thread fails to spawn, shost->ehandler is set to ERR_PTR(-ENOMEM). The error handler cleanup code in scsi_host_dev_release() will call kthread_stop() if shost->ehandler != NULL which will always be the case whether the kthread was successfully spawned or not. In the case that it failed to spawn this has the nasty side effect of trying to dereference an invalid pointer when kthread_stop() is called. The following splat provides an example of this behavior in the wild: scsi host11: error handler thread failed to spawn, error = -4 Kernel attempted to read user page (10c) - exploit attempt? (uid: 0) BUG: Kernel NULL pointer dereference on read at 0x0000010c Faulting instruction address: 0xc00000000818e9a8 Oops: Kernel access of bad area, sig: 11 [#1] LE PAGE_SIZE=64K MMU=Hash SMP NR_CPUS=2048 NUMA pSeries Modules linked in: ibmvscsi(+) scsi_transport_srp dm_multipath dm_mirror dm_region hash dm_log dm_mod fuse overlay squashfs loop CPU: 12 PID: 274 Comm: systemd-udevd Not tainted 5.13.0-rc7 #1 NIP: c00000000818e9a8 LR: c0000000089846e8 CTR: 0000000000007ee8 REGS: c000000037d12ea0 TRAP: 0300 Not tainted (5.13.0-rc7) MSR: 800000000280b033 <SF,VEC,VSX,EE,FP,ME,IR,DR,RI,LE> CR: 28228228 XER: 20040001 CFAR: c0000000089846e4 DAR: 000000000000010c DSISR: 40000000 IRQMASK: 0 GPR00: c0000000089846e8 c000000037d13140 c000000009cc1100 fffffffffffffffc GPR04: 0000000000000001 0000000000000000 0000000000000000 c000000037dc0000 GPR08: 0000000000000000 c000000037dc0000 0000000000000001 00000000fffff7ff GPR12: 0000000000008000 c00000000a049000 c000000037d13d00 000000011134d5a0 GPR16: 0000000000001740 c0080000190d0000 c0080000190d1740 c000000009129288 GPR20: c000000037d13bc0 0000000000000001 c000000037d13bc0 c0080000190b7898 GPR24: c0080000190b7708 0000000000000000 c000000033bb2c48 0000000000000000 GPR28: c000000046b28280 0000000000000000 000000000000010c fffffffffffffffc NIP [c00000000818e9a8] kthread_stop+0x38/0x230 LR [c0000000089846e8] scsi_host_dev_release+0x98/0x160 Call Trace: [c000000033bb2c48] 0xc000000033bb2c48 (unreliable) [c0000000089846e8] scsi_host_dev_release+0x98/0x160 [c00000000891e960] device_release+0x60/0x100 [c0000000087e55c4] kobject_release+0x84/0x210 [c00000000891ec78] put_device+0x28/0x40 [c000000008984ea4] scsi_host_alloc+0x314/0x430 [c0080000190b38bc] ibmvscsi_probe+0x54/0xad0 [ibmvscsi] [c000000008110104] vio_bus_probe+0xa4/0x4b0 [c00000000892a860] really_probe+0x140/0x680 [c00000000892aefc] driver_probe_device+0x15c/0x200 [c00000000892b63c] device_driver_attach+0xcc/0xe0 [c00000000892b740] __driver_attach+0xf0/0x200 [c000000008926f28] bus_for_each_dev+0xa8/0x130 [c000000008929ce4] driver_attach+0x34/0x50 [c000000008928fc0] bus_add_driver+0x1b0/0x300 [c00000000892c798] driver_register+0x98/0x1a0 [c00000000810eb60] __vio_register_driver+0x80/0xe0 [c0080000190b4a30] ibmvscsi_module_init+0x9c/0xdc [ibmvscsi] [c0000000080121d0] do_one_initcall+0x60/0x2d0 [c000000008261abc] do_init_module+0x7c/0x320 [c000000008265700] load_module+0x2350/0x25b0 [c000000008265cb4] __do_sys_finit_module+0xd4/0x160 [c000000008031110] system_call_exception+0x150/0x2d0 [c00000000800d35c] system_call_common+0xec/0x278 Fix this be nulling shost->ehandler when the kthread fails to spawn.
References
Impacted products
Vendor Product Version
Linux Linux Version: 8958181c1663e24a13434448e7d6b96b5d04900a
Version: db08ce595dd64ea9859f7d088b51cbfc8e685c66
Version: 2dc85045ae65b9302a1d2e2ddd7ce4c030153a6a
Version: 79296e292d67fa7b5fb8d8c27343683e823872c8
Version: 7a696ce1d5d16a33a6cd6400bbcc0339b2460e11
Version: 45d83db4728127944b237c0c8248987df9d478e7
Version: 66a834d092930cf41d809c0e989b13cd6f9ca006
Version: 66a834d092930cf41d809c0e989b13cd6f9ca006
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However, in the unlikely\\ncase that the error handler thread fails to spawn, shost-\u003eehandler is set\\nto ERR_PTR(-ENOMEM).\\n\\nThe error handler cleanup code in scsi_host_dev_release() will call\\nkthread_stop() if shost-\u003eehandler != NULL which will always be the case\\nwhether the kthread was successfully spawned or not. In the case that it\\nfailed to spawn this has the nasty side effect of trying to dereference an\\ninvalid pointer when kthread_stop() is called. The following splat provides\\nan example of this behavior in the wild:\\n\\nscsi host11: error handler thread failed to spawn, error = -4\\nKernel attempted to read user page (10c) - exploit attempt? (uid: 0)\\nBUG: Kernel NULL pointer dereference on read at 0x0000010c\\nFaulting instruction address: 0xc00000000818e9a8\\nOops: Kernel access of bad area, sig: 11 [#1]\\nLE PAGE_SIZE=64K MMU=Hash SMP NR_CPUS=2048 NUMA pSeries\\nModules linked in: ibmvscsi(+) scsi_transport_srp dm_multipath dm_mirror dm_region\\n hash dm_log dm_mod fuse overlay squashfs loop\\nCPU: 12 PID: 274 Comm: systemd-udevd Not tainted 5.13.0-rc7 #1\\nNIP:  c00000000818e9a8 LR: c0000000089846e8 CTR: 0000000000007ee8\\nREGS: c000000037d12ea0 TRAP: 0300   Not tainted  (5.13.0-rc7)\\nMSR:  800000000280b033 \u0026lt;SF,VEC,VSX,EE,FP,ME,IR,DR,RI,LE\u0026gt;  CR: 28228228\\nXER: 20040001\\nCFAR: c0000000089846e4 DAR: 000000000000010c DSISR: 40000000 IRQMASK: 0\\nGPR00: c0000000089846e8 c000000037d13140 c000000009cc1100 fffffffffffffffc\\nGPR04: 0000000000000001 0000000000000000 0000000000000000 c000000037dc0000\\nGPR08: 0000000000000000 c000000037dc0000 0000000000000001 00000000fffff7ff\\nGPR12: 0000000000008000 c00000000a049000 c000000037d13d00 000000011134d5a0\\nGPR16: 0000000000001740 c0080000190d0000 c0080000190d1740 c000000009129288\\nGPR20: c000000037d13bc0 0000000000000001 c000000037d13bc0 c0080000190b7898\\nGPR24: c0080000190b7708 0000000000000000 c000000033bb2c48 0000000000000000\\nGPR28: c000000046b28280 0000000000000000 000000000000010c fffffffffffffffc\\nNIP [c00000000818e9a8] kthread_stop+0x38/0x230\\nLR [c0000000089846e8] scsi_host_dev_release+0x98/0x160\\nCall Trace:\\n[c000000033bb2c48] 0xc000000033bb2c48 (unreliable)\\n[c0000000089846e8] scsi_host_dev_release+0x98/0x160\\n[c00000000891e960] device_release+0x60/0x100\\n[c0000000087e55c4] kobject_release+0x84/0x210\\n[c00000000891ec78] put_device+0x28/0x40\\n[c000000008984ea4] scsi_host_alloc+0x314/0x430\\n[c0080000190b38bc] ibmvscsi_probe+0x54/0xad0 [ibmvscsi]\\n[c000000008110104] vio_bus_probe+0xa4/0x4b0\\n[c00000000892a860] really_probe+0x140/0x680\\n[c00000000892aefc] driver_probe_device+0x15c/0x200\\n[c00000000892b63c] device_driver_attach+0xcc/0xe0\\n[c00000000892b740] __driver_attach+0xf0/0x200\\n[c000000008926f28] bus_for_each_dev+0xa8/0x130\\n[c000000008929ce4] driver_attach+0x34/0x50\\n[c000000008928fc0] bus_add_driver+0x1b0/0x300\\n[c00000000892c798] driver_register+0x98/0x1a0\\n[c00000000810eb60] __vio_register_driver+0x80/0xe0\\n[c0080000190b4a30] ibmvscsi_module_init+0x9c/0xdc [ibmvscsi]\\n[c0000000080121d0] do_one_initcall+0x60/0x2d0\\n[c000000008261abc] do_init_module+0x7c/0x320\\n[c000000008265700] load_module+0x2350/0x25b0\\n[c000000008265cb4] __do_sys_finit_module+0xd4/0x160\\n[c000000008031110] system_call_exception+0x150/0x2d0\\n[c00000000800d35c] system_call_common+0xec/0x278\\n\\nFix this be nulling shost-\u003eehandler when the kthread fails to spawn.\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-11-04T12:03:56.937Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47337\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-11-04T12:03:56.937Z\", \"dateReserved\": \"2024-05-21T14:28:16.978Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-21T14:35:46.379Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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