ghsa-38w9-7cc9-2cwv
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
powerpc64/bpf: Limit 'ldbrx' to processors compliant with ISA v2.06
Johan reported the below crash with test_bpf on ppc64 e5500:
test_bpf: #296 ALU_END_FROM_LE 64: 0x0123456789abcdef -> 0x67452301 jited:1
Oops: Exception in kernel mode, sig: 4 [#1]
BE PAGE_SIZE=4K SMP NR_CPUS=24 QEMU e500
Modules linked in: test_bpf(+)
CPU: 0 PID: 76 Comm: insmod Not tainted 5.14.0-03771-g98c2059e008a-dirty #1
NIP: 8000000000061c3c LR: 80000000006dea64 CTR: 8000000000061c18
REGS: c0000000032d3420 TRAP: 0700 Not tainted (5.14.0-03771-g98c2059e008a-dirty)
MSR: 0000000080089000
Illegal instruction
The illegal instruction turned out to be 'ldbrx' emitted for BPF_FROM_[L|B]E, which was only introduced in ISA v2.06. Guard use of the same and implement an alternative approach for older processors.
{
"affected": [],
"aliases": [
"CVE-2022-48755"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-06-20T12:15:13Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc64/bpf: Limit \u0027ldbrx\u0027 to processors compliant with ISA v2.06\n\nJohan reported the below crash with test_bpf on ppc64 e5500:\n\n test_bpf: #296 ALU_END_FROM_LE 64: 0x0123456789abcdef -\u003e 0x67452301 jited:1\n Oops: Exception in kernel mode, sig: 4 [#1]\n BE PAGE_SIZE=4K SMP NR_CPUS=24 QEMU e500\n Modules linked in: test_bpf(+)\n CPU: 0 PID: 76 Comm: insmod Not tainted 5.14.0-03771-g98c2059e008a-dirty #1\n NIP: 8000000000061c3c LR: 80000000006dea64 CTR: 8000000000061c18\n REGS: c0000000032d3420 TRAP: 0700 Not tainted (5.14.0-03771-g98c2059e008a-dirty)\n MSR: 0000000080089000 \u003cEE,ME\u003e CR: 88002822 XER: 20000000 IRQMASK: 0\n \u003c...\u003e\n NIP [8000000000061c3c] 0x8000000000061c3c\n LR [80000000006dea64] .__run_one+0x104/0x17c [test_bpf]\n Call Trace:\n .__run_one+0x60/0x17c [test_bpf] (unreliable)\n .test_bpf_init+0x6a8/0xdc8 [test_bpf]\n .do_one_initcall+0x6c/0x28c\n .do_init_module+0x68/0x28c\n .load_module+0x2460/0x2abc\n .__do_sys_init_module+0x120/0x18c\n .system_call_exception+0x110/0x1b8\n system_call_common+0xf0/0x210\n --- interrupt: c00 at 0x101d0acc\n \u003c...\u003e\n ---[ end trace 47b2bf19090bb3d0 ]---\n\n Illegal instruction\n\nThe illegal instruction turned out to be \u0027ldbrx\u0027 emitted for\nBPF_FROM_[L|B]E, which was only introduced in ISA v2.06. Guard use of\nthe same and implement an alternative approach for older processors.",
"id": "GHSA-38w9-7cc9-2cwv",
"modified": "2024-06-20T12:31:22Z",
"published": "2024-06-20T12:31:22Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-48755"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/129c71829d7f46423d95c19e8d87ce956d4c6e1c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3bfbc00587dc883eaed383558ae512a351c2cd09"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3f5f766d5f7f95a69a630da3544a1a0cee1cdddf"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/aaccfeeee1630b155e8ff0d6c449d3de1ef86e73"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
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- Confirmed: The vulnerability is confirmed from an analyst perspective.
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- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.