Description
tss_alloc in sys/arch/i386/i386/gdt.c in OpenBSD 6.2 and 6.3 has a Local Denial of Service (system crash) due to incorrect I/O port access control on the i386 architecture.
References
- http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/sys/arch/i386/i386/gdt.c.diff?r1=1.37&r2=1.37.8.1&f=h
- https://ftp.openbsd.org/pub/OpenBSD/patches/6.3/common/015_ioport.patch.sig
- https://ftp.openbsd.org/pub/OpenBSD/patches/6.2/common/020_ioport.patch.sig
- 1041550 vdb-entry
- http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/sys/arch/i386/i386/gdt.c