Sequence of Processor Instructions Leads to Unexpected Behavior Affecting kernel-rt-debug-modules-internal package, versions *
Threat Intelligence
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Test your applications- Snyk IDSNYK-RHEL8-KERNELRTDEBUGMODULESINTERNAL-7326692
- published21 Jun 2024
- disclosed20 Jun 2024
Introduced: 20 Jun 2024
CVE-2022-48755 (opens in a new tab)How to fix?
There is no fixed version for RHEL:8 kernel-rt-debug-modules-internal.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-rt-debug-modules-internal package and not the kernel-rt-debug-modules-internal package as distributed by RHEL.
See How to fix? for RHEL:8 relevant fixed versions and status.
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.
References
- https://access.redhat.com/security/cve/CVE-2022-48755
- https://git.kernel.org/stable/c/129c71829d7f46423d95c19e8d87ce956d4c6e1c
- https://git.kernel.org/stable/c/3bfbc00587dc883eaed383558ae512a351c2cd09
- https://git.kernel.org/stable/c/3f5f766d5f7f95a69a630da3544a1a0cee1cdddf
- https://git.kernel.org/stable/c/aaccfeeee1630b155e8ff0d6c449d3de1ef86e73