In the Linux kernel, the following vulnerability has been resolved:
riscv: Fix kernel crash due to PRSETTAGGEDADDRCTRL
When userspace does PRSETTAGGEDADDRCTRL, but Supm extension is not available, the kernel crashes:
Oops - illegal instruction [#1] [snip] epc : settaggedaddrctrl+0x112/0x15a ra : settaggedaddrctrl+0x74/0x15a epc : ffffffff80011ace ra : ffffffff80011a30 sp : ffffffc60039be10 [snip] status: 0000000200000120 badaddr: 0000000010a79073 cause: 0000000000000002 settaggedaddrctrl+0x112/0x15a _riscvsysprctl+0x352/0x73c dotrapecallu+0x17c/0x20c andleexception+0x150/0x15c
Fix it by checking if Supm is available.