CVE-2022-48755

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Source
https://cve.org/CVERecord?id=CVE-2022-48755
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2022-48755.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2022-48755
Downstream
Related
Published
2024-06-20T11:13:35.212Z
Modified
2026-03-20T12:21:50.530747Z
Summary
powerpc64/bpf: Limit 'ldbrx' to processors compliant with ISA v2.06
Details

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:

testbpf: #296 ALUENDFROMLE 64: 0x0123456789abcdef -> 0x67452301 jited:1 Oops: Exception in kernel mode, sig: 4 [#1] BE PAGESIZE=4K SMP NRCPUS=24 QEMU e500 Modules linked in: testbpf(+) 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 <EE,ME> CR: 88002822 XER: 20000000 IRQMASK: 0 <...> NIP [8000000000061c3c] 0x8000000000061c3c LR [80000000006dea64] .runone+0x104/0x17c [testbpf] Call Trace: .runone+0x60/0x17c [testbpf] (unreliable) .testbpfinit+0x6a8/0xdc8 [testbpf] .dooneinitcall+0x6c/0x28c .doinitmodule+0x68/0x28c .loadmodule+0x2460/0x2abc .dosysinitmodule+0x120/0x18c .systemcallexception+0x110/0x1b8 systemcallcommon+0xf0/0x210 --- interrupt: c00 at 0x101d0acc <...> ---[ end trace 47b2bf19090bb3d0 ]---

Illegal instruction

The illegal instruction turned out to be 'ldbrx' emitted for BPFFROM[L|B]E, which was only introduced in ISA v2.06. Guard use of the same and implement an alternative approach for older processors.

Database specific 
{
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/48xxx/CVE-2022-48755.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
156d0e290e969caba25f1851c52417c14d141b24
Fixed
129c71829d7f46423d95c19e8d87ce956d4c6e1c
Fixed
3bfbc00587dc883eaed383558ae512a351c2cd09
Fixed
aaccfeeee1630b155e8ff0d6c449d3de1ef86e73
Fixed
3f5f766d5f7f95a69a630da3544a1a0cee1cdddf

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2022-48755.json"