GHSA-9W68-2PR9-7G2R

Vulnerability from github – Published: 2024-07-29 15:30 – Updated: 2025-11-04 00:31
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

powerpc/pseries: Whitelist dtl slub object for copying to userspace

Reading the dispatch trace log from /sys/kernel/debug/powerpc/dtl/cpu-* results in a BUG() when the config CONFIG_HARDENED_USERCOPY is enabled as shown below.

kernel BUG at mm/usercopy.c:102!
Oops: Exception in kernel mode, sig: 5 [#1]
LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=2048 NUMA pSeries
Modules linked in: xfs libcrc32c dm_service_time sd_mod t10_pi sg ibmvfc
scsi_transport_fc ibmveth pseries_wdt dm_multipath dm_mirror dm_region_hash dm_log dm_mod fuse
CPU: 27 PID: 1815 Comm: python3 Not tainted 6.10.0-rc3 #85
Hardware name: IBM,9040-MRX POWER10 (raw) 0x800200 0xf000006 of:IBM,FW1060.00 (NM1060_042) hv:phyp pSeries
NIP:  c0000000005d23d4 LR: c0000000005d23d0 CTR: 00000000006ee6f8
REGS: c000000120c078c0 TRAP: 0700   Not tainted  (6.10.0-rc3)
MSR:  8000000000029033 <SF,EE,ME,IR,DR,RI,LE>  CR: 2828220f  XER: 0000000e
CFAR: c0000000001fdc80 IRQMASK: 0
[ ... GPRs omitted ... ]
NIP [c0000000005d23d4] usercopy_abort+0x78/0xb0
LR [c0000000005d23d0] usercopy_abort+0x74/0xb0
Call Trace:
 usercopy_abort+0x74/0xb0 (unreliable)
 __check_heap_object+0xf8/0x120
 check_heap_object+0x218/0x240
 __check_object_size+0x84/0x1a4
 dtl_file_read+0x17c/0x2c4
 full_proxy_read+0x8c/0x110
 vfs_read+0xdc/0x3a0
 ksys_read+0x84/0x144
 system_call_exception+0x124/0x330
 system_call_vectored_common+0x15c/0x2ec
--- interrupt: 3000 at 0x7fff81f3ab34

Commit 6d07d1cd300f ("usercopy: Restrict non-usercopy caches to size 0") requires that only whitelisted areas in slab/slub objects can be copied to userspace when usercopy hardening is enabled using CONFIG_HARDENED_USERCOPY. Dtl contains hypervisor dispatch events which are expected to be read by privileged users. Hence mark this safe for user access. Specify useroffset=0 and usersize=DISPATCH_LOG_BYTES to whitelist the entire object.

Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Show details on source website
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{
  "affected": [],
  "aliases": [
    "CVE-2024-41065"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-07-29T15:15:14Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/pseries: Whitelist dtl slub object for copying to userspace\n\nReading the dispatch trace log from /sys/kernel/debug/powerpc/dtl/cpu-*\nresults in a BUG() when the config CONFIG_HARDENED_USERCOPY is enabled as\nshown below.\n\n    kernel BUG at mm/usercopy.c:102!\n    Oops: Exception in kernel mode, sig: 5 [#1]\n    LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=2048 NUMA pSeries\n    Modules linked in: xfs libcrc32c dm_service_time sd_mod t10_pi sg ibmvfc\n    scsi_transport_fc ibmveth pseries_wdt dm_multipath dm_mirror dm_region_hash dm_log dm_mod fuse\n    CPU: 27 PID: 1815 Comm: python3 Not tainted 6.10.0-rc3 #85\n    Hardware name: IBM,9040-MRX POWER10 (raw) 0x800200 0xf000006 of:IBM,FW1060.00 (NM1060_042) hv:phyp pSeries\n    NIP:  c0000000005d23d4 LR: c0000000005d23d0 CTR: 00000000006ee6f8\n    REGS: c000000120c078c0 TRAP: 0700   Not tainted  (6.10.0-rc3)\n    MSR:  8000000000029033 \u003cSF,EE,ME,IR,DR,RI,LE\u003e  CR: 2828220f  XER: 0000000e\n    CFAR: c0000000001fdc80 IRQMASK: 0\n    [ ... GPRs omitted ... ]\n    NIP [c0000000005d23d4] usercopy_abort+0x78/0xb0\n    LR [c0000000005d23d0] usercopy_abort+0x74/0xb0\n    Call Trace:\n     usercopy_abort+0x74/0xb0 (unreliable)\n     __check_heap_object+0xf8/0x120\n     check_heap_object+0x218/0x240\n     __check_object_size+0x84/0x1a4\n     dtl_file_read+0x17c/0x2c4\n     full_proxy_read+0x8c/0x110\n     vfs_read+0xdc/0x3a0\n     ksys_read+0x84/0x144\n     system_call_exception+0x124/0x330\n     system_call_vectored_common+0x15c/0x2ec\n    --- interrupt: 3000 at 0x7fff81f3ab34\n\nCommit 6d07d1cd300f (\"usercopy: Restrict non-usercopy caches to size 0\")\nrequires that only whitelisted areas in slab/slub objects can be copied to\nuserspace when usercopy hardening is enabled using CONFIG_HARDENED_USERCOPY.\nDtl contains hypervisor dispatch events which are expected to be read by\nprivileged users. Hence mark this safe for user access.\nSpecify useroffset=0 and usersize=DISPATCH_LOG_BYTES to whitelist the\nentire object.",
  "id": "GHSA-9w68-2pr9-7g2r",
  "modified": "2025-11-04T00:31:01Z",
  "published": "2024-07-29T15:30:44Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-41065"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0f5892212c27be31792ef1daa89c8dac1b3047e4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1a14150e1656f7a332a943154fc486504db4d586"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1ee68686d1e2a5da35d5650be0be1ce06fe2ceb2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6b16098148ea58a67430d90e20476be2377c3acd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a7b952941ce07e1e7a2cafd08c64a98e14f553e6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e512a59b472684d8585125101ab03b86c2c1348a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e59822f9d700349cd17968d22c979db23a2d347f"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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