OpenBSD 7.9 arrives with continued emphasis on security and stability. A previously reported OpenBSD kernel crash issue caused by malformed TCP/IP Selective Acknowledgement options was fixed before the release, with older versions receiving the fix via sysupdate. The release includes modest feature updates for amd64 systems, including a higher maximum processor core count, fixes for very large RAM configurations, and support for more partitions per disk. The CPU scheduler on amd64 and Arm64 gains awareness of heterogeneous cores and assigns processes across four performance levels labeled S-P-E-L. Additional changes include improved RISC-V support, basic Wi-Fi 6 support, updated graphics driver stack from Linux kernel 6.18, sound driver optimizations, and upgrades to LibreSSL 4.3.0 and OpenSSH 10.3.
"A TCP/IP packet with malformed Selective Acknowledgement options could crash the kernel. This was a real problem, and the bug that caused it went back 27 years, but it doesn't let anyone in. The OpenBSD developers had already included a fix for the bug two weeks earlier, so OpenBSD 7.8 users would get it the next time they ran sysupdate, and it is of course fixed in this version."
"On x86-64 machines - which it terms amd64 - 7.9 now supports a maximum of 255 processor cores, and fixes a bug on machines with over 512 GB of RAM. It can also handle up to 52 partitions per disk. Internally, there can be up to 64, but the limit is now the number of lowercase and uppercase letters of the Roman alphabet, which it uses in labels."
"On x86-64 and Arm64, the CPU scheduler now understands heterogeneous CPU cores with different performance levels, and can assign processes to four different performance levels described by the letters S-P-E-L, denoting SMT, performance, efficient, and lethargic."
"The release announcement also lists other changes, including improved support for RISC-V boards, basic support for Wi-Fi 6, the graphics driver stack from Linux kernel 6.18, and even more optimizations to the already-low-latency sound driver stack. There are various tweaks and bug fixes for the various RISC platforms it supports. Version upgrades include LibreSSL 4.3.0, OpenSSH 10.3, and many improve"
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