[PATCH 0/6] RISC-V kasan rework

Alexandre Ghiti
2022-12-16T16:22:10Z

As described in patch 2, our current kasan implementation is intricate,
so I tried to simplify the implementation and mimic what arm64/x86 are
doing.

In addition it fixes UEFI bootflow with a kasan kernel and kasan inline
instrumentation: all kasan configurations were tested on a large ubuntu
kernel with success with KASAN_KUNIT_TEST and KASAN_MODULE_TEST.

inline ubuntu config + uefi:
sv39: OK
sv48: OK
sv57: OK

outline ubuntu config + uefi:
sv39: OK
sv48: OK
sv57: OK

Actually 1 test always fails with KASAN_KUNIT_TEST that I have to check:
# kasan_bitops_generic: EXPECTATION FAILED at mm/kasan/kasan__test.c:1020
KASAN failure expected in "set_bit(nr, addr)", but none occurrred

Note that Palmer recently proposed to remove COMMAND_LINE_SIZE from the
userspace abi
https://lore.kernel.org/lkml/20221211061358.28035-1-palmer@rivosinc.com/T/
so that we can finally increase the command line to fit all kasan kernel
parameters.

All of this should hopefully fix the syzkaller riscv build that has been
failing for a few months now, any test is appreciated and if I can help
in any way, please ask.

Alexandre Ghiti (6):
riscv: Split early and final KASAN population functions
riscv: Rework kasan population functions
riscv: Move DTB_EARLY_BASE_VA to the kernel address space
riscv: Fix EFI stub usage of KASAN instrumented string functions
riscv: Fix ptdump when KASAN is enabled
riscv: Unconditionnally select KASAN_VMALLOC if KASAN

arch/riscv/Kconfig | 1 +
arch/riscv/kernel/image-vars.h | 8 -
arch/riscv/mm/init.c | 2 +-
arch/riscv/mm/kasan_init.c | 511 ++++++++++++++------------
arch/riscv/mm/ptdump.c | 24 +-
drivers/firmware/efi/libstub/Makefile | 7 +-
drivers/firmware/efi/libstub/string.c | 133 +++++++
7 files changed, 435 insertions(+), 251 deletions(-)