Riskcovery

CVE-2022-48755

powerpc64/bpf: Limit 'ldbrx' to processors compliant with ISA v2.06

State
Published
Severity
Not scored
Published
Jun 20, 2024
Updated
May 11, 2026
Reserved
Jun 20, 2024

Read the record on cve.org

Description

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 <EE,ME> CR: 88002822 XER: 20000000 IRQMASK: 0 <...> NIP [8000000000061c3c] 0x8000000000061c3c LR [80000000006dea64] .__run_one+0x104/0x17c [test_bpf] Call Trace: .__run_one+0x60/0x17c [test_bpf] (unreliable) .test_bpf_init+0x6a8/0xdc8 [test_bpf] .do_one_initcall+0x6c/0x28c .do_init_module+0x68/0x28c .load_module+0x2460/0x2abc .__do_sys_init_module+0x120/0x18c .system_call_exception+0x110/0x1b8 system_call_common+0xf0/0x210 --- interrupt: c00 at 0x101d0acc <...> ---[ end trace 47b2bf19090bb3d0 ]---

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 156d0e290e969caba25f1851c52417c14d141b24 to before 129c71829d7f46423d95c19e8d87ce956d4c6e1cAffected
  • 156d0e290e969caba25f1851c52417c14d141b24 to before 3bfbc00587dc883eaed383558ae512a351c2cd09Affected
  • 156d0e290e969caba25f1851c52417c14d141b24 to before aaccfeeee1630b155e8ff0d6c449d3de1ef86e73Affected
  • 156d0e290e969caba25f1851c52417c14d141b24 to before 3f5f766d5f7f95a69a630da3544a1a0cee1cdddfAffected
LinuxLinux
  • 4.8Affected
  • before 4.8Not affected
  • 5.10.96 through 5.10.*Not affected
  • 5.15.19 through 5.15.*Not affected
  • 5.16.5 through 5.16.*Not affected
  • 5.17 and laterNot affected

References

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