А давайте-ка вспомним самые известные операционные системы для архитектуры PowerPC. В первую очередь на ум приходят, конечно же, старые ОС для «маков»: классическая MacOS 7-9 и ранние релизы Mac OS X вплоть до версии 10.5. Еще есть AmigaOS 4, Windows NT 3.5, 3.51 и 4.0, поддерживавшая ограниченный модельный…
arch/powerpc/mm/mmu_context_book3s64.c in the Linux kernel before 5.1.15 for powerpc has a bug where unrelated processes may be able to read/write to one another's virtual memory under certain conditions via an mmap above 512 TB. Only a subset of powerpc systems are affected.
In the Linux kernel through 5.2.1 on the powerpc platform, when hardware transactional memory is disabled, a local user can cause a denial of service (TM Bad Thing exception and system crash) via a sigreturn() system call that sends a crafted signal frame. This affects arch/powerpc/kernel/signal_32.c and arch/powerpc/kernel/signal_64.c.
The Linux kernel through 5.3.13 on powerpc allows Information Exposure because the Spectre-RSB mitigation is not in place for all applicable CPUs, aka CID-39e72bf96f58. This is related to arch/powerpc/kernel/entry_64.S and arch/powerpc/kernel/security.c.