Alexandre Ghiti 25abe0db92 riscv: Fix kfence now that the linear mapping can be backed by PUD/P4D/PGD ...

RISC-V Kfence implementation used to rely on the fact the linear mapping
was backed by at most PMD hugepages, which is not true anymore since
commit 3335068f87 ("riscv: Use PUD/P4D/PGD pages for the linear
mapping").

Instead of splitting PUD/P4D/PGD mappings afterwards, directly map the
kfence pool region using PTE mappings by allocating this region before
setup_vm_final().

Reported-by: syzbot+a74d57bddabbedd75135@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=a74d57bddabbedd75135
Fixes: 3335068f87 ("riscv: Use PUD/P4D/PGD pages for the linear mapping")
Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Link: https://lore.kernel.org/r/20230606130444.25090-1-alexghiti@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

2023-06-07 07:13:53 -07:00

..

asm

riscv: Fix kfence now that the linear mapping can be backed by PUD/P4D/PGD

2023-06-07 07:13:53 -07:00

uapi/asm

Merge tag 'kvm-riscv-6.4-1' of https://github.com/kvm-riscv/linux into HEAD

2023-05-05 06:11:48 -04:00