ghsa-9w68-2pr9-7g2r
Vulnerability from github
Published
2024-07-29 15:30
Modified
2024-07-29 15:30
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.
{
"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": null
},
"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": "2024-07-29T15:30:45Z",
"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"
}
],
"schema_version": "1.4.0",
"severity": []
}
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