Palmer Dabbelt 05942f780a

Merge patch series "riscv: Fix set_memory_XX() and set_direct_map_XX()" ...

Alexandre Ghiti <alexghiti@rivosinc.com> says:

Those 2 patches fix the set_memory_XX() and set_direct_map_XX() APIs, which
in turn fix STRICT_KERNEL_RWX and memfd_secret(). Those were broken since the
permission changes were not applied to the linear mapping because the linear
mapping is mapped using hugepages and walk_page_range_novma() does not split
such mappings.

To fix that, patch 1 disables PGD mappings in the linear mapping as it is
hard to propagate changes at this level in *all* the page tables, this has the
downside of disabling PMD mapping for sv32 and PUD (1GB) mapping for sv39 in
the linear mapping (for specific kernels, we could add a Kconfig to enable
ARCH_HAS_SET_DIRECT_MAP and STRICT_KERNEL_RWX if needed, I'm pretty sure we'll
discuss that).

patch 2 implements the split of the huge linear mappings so that
walk_page_range_novma() can properly apply the permissions. The whole split is
protected with mmap_sem in write mode, but I'm wondering if that's enough,
any opinion on that is appreciated.

* b4-shazam-merge:
  riscv: Fix set_memory_XX() and set_direct_map_XX() by splitting huge linear mappings
  riscv: Don't use PGD entries for the linear mapping

Link: https://lore.kernel.org/r/20231108075930.7157-1-alexghiti@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

2023-11-08 07:08:35 -08:00

..

cache-ops.c

riscv: split cache ops out of dma-noncoherent.c

2023-11-07 09:37:42 -08:00

cacheflush.c

RISC-V: cacheflush: Initialize CBO variables on ACPI systems

2023-10-26 09:40:34 -07:00

context.c

riscv: mm: use bitmap_zero() API

2023-08-31 00:18:29 -07:00

dma-noncoherent.c

riscv: split cache ops out of dma-noncoherent.c

2023-11-07 09:37:42 -08:00

extable.c

riscv: extable: fix err reg writing in dedicated uaccess handler

2022-02-08 17:02:47 -08:00

fault.c

mm: drop per-VMA lock when returning VM_FAULT_RETRY or VM_FAULT_COMPLETED

2023-08-24 16:20:17 -07:00

hugetlbpage.c

mm: riscv: fix an unsafe pte read in huge_pte_alloc()

2023-07-05 07:24:17 -07:00

init.c

Merge patch series "riscv: Fix set_memory_XX() and set_direct_map_XX()"

2023-11-08 07:08:35 -08:00

kasan_init.c

RISC-V Patches for the 6.6 Merge Window, Part 1

2023-09-01 08:09:48 -07:00

Makefile

riscv: split cache ops out of dma-noncoherent.c

2023-11-07 09:37:42 -08:00

pageattr.c

riscv: Fix set_memory_XX() and set_direct_map_XX() by splitting huge linear mappings

2023-11-08 07:08:33 -08:00

pgtable.c

riscv: mm: Implement pmdp_collapse_flush for THP

2023-02-01 20:52:09 -08:00

physaddr.c

riscv: Use PUD/P4D/PGD pages for the linear mapping

2023-04-18 20:43:04 -07:00

pmem.c

RISC-V: capitalise CMO op macros

2023-11-05 09:11:23 -08:00

ptdump.c

Merge patch series "Improve PTDUMP and introduce new fields"

2023-11-05 09:41:57 -08:00

tlbflush.c

riscv: Improve flush_tlb_kernel_range()

2023-11-06 07:20:52 -08:00