Commit b37981ce authored by Yuli Wang's avatar Yuli Wang Committed by Huacai Chen
Browse files

LoongArch: Enable ARCH_SUPPORTS_MSEAL_SYSTEM_MAPPINGS 

Provide support for CONFIG_MSEAL_SYSTEM_MAPPINGS on LoongArch, covering
the vdso.

Link: https://lore.kernel.org/all/25bad37f-273e-4626-999c-e1890be96182@lucifer.local/


Acked-by: default avatarLiam R. Howlett <Liam.Howlett@oracle.com>
Acked-by: default avatarLorenzo Stoakes <lorenzo.stoakes@oracle.com>
Reviewed-by: default avatarJeff Xu <jeffxu@chromium.org>
Tested-by: default avatarYuli Wang <wangyuli@uniontech.com>
Signed-off-by: default avatarYuli Wang <wangyuli@uniontech.com>
Signed-off-by: default avatarHuacai Chen <chenhuacai@loongson.cn>
parent 93f43731

Documentation/features/core/mseal_sys_mappings/arch-support.txt

+1 −1
Original line number Diff line number Diff line
@@ -12,7 +12,7 @@ 
    |       arm64: |  ok  |

    |        csky: |  N/A |

    |     hexagon: |  N/A |

    |   loongarch: | TODO |

    |   loongarch: |  ok  |

    |        m68k: |  N/A |

    |  microblaze: |  N/A |

    |        mips: | TODO |

Documentation/userspace-api/mseal.rst

+1 −1
Original line number Diff line number Diff line
@@ -144,7 +144,7 @@ Use cases 
  architecture.



  The following architectures currently support this feature: x86-64, arm64,

  and s390.

  loongarch and s390.



  WARNING: This feature breaks programs which rely on relocating

  or unmapping system mappings. Known broken software at the time

arch/loongarch/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -69,6 +69,7 @@ config LOONGARCH 
	select ARCH_SUPPORTS_INT128 if CC_HAS_INT128

	select ARCH_SUPPORTS_LTO_CLANG

	select ARCH_SUPPORTS_LTO_CLANG_THIN

	select ARCH_SUPPORTS_MSEAL_SYSTEM_MAPPINGS

	select ARCH_SUPPORTS_NUMA_BALANCING

	select ARCH_SUPPORTS_RT

	select ARCH_USE_BUILTIN_BSWAP

arch/loongarch/kernel/vdso.c

+3 −1
Original line number Diff line number Diff line
@@ -105,7 +105,9 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp) 


	vdso_addr = data_addr + VVAR_SIZE;

	vma = _install_special_mapping(mm, vdso_addr, info->size,

				       VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC,

				       VM_READ | VM_EXEC |

				       VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC |

				       VM_SEALED_SYSMAP,

				       &info->code_mapping);

	if (IS_ERR(vma)) {

		ret = PTR_ERR(vma);