cve-2024-41065
Vulnerability from cvelistv5
Published
2024-07-29 14:57
Modified
2024-09-11 17:32
Severity ?
Summary
powerpc/pseries: Whitelist dtl slub object for copying to userspace
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website


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              "version": "5.4.281",
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          "value": "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."
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    "assignerShortName": "Linux",
    "cveId": "CVE-2024-41065",
    "datePublished": "2024-07-29T14:57:27.011Z",
    "dateReserved": "2024-07-12T12:17:45.628Z",
    "dateUpdated": "2024-09-11T17:32:58.163Z",
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  }
}


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