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Code Issues Releases Wiki Activity

LoongArch: Enable ARCH_SUPPORTS_MSEAL_SYSTEM_MAPPINGS

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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: Liam R. Howlett <Liam.Howlett@oracle.com>
Acked-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Reviewed-by: Jeff Xu <jeffxu@chromium.org>
Tested-by: Yuli Wang <wangyuli@uniontech.com>
Signed-off-by: Yuli Wang <wangyuli@uniontech.com>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Yuli Wang 2025-05-30 21:45:42 +08:00 committed by Huacai Chen
parent 93f4373156
commit b37981ce54
4 changed files with 6 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
Documentation/features/core/mseal_sys_mappings/arch-support.txt
View File

@ -12,7 +12,7 @@
| arm64: | ok |
| csky: | N/A |
| hexagon: | N/A |
| loongarch: | TODO |
| loongarch: | ok |
| m68k: | N/A |
| microblaze: | N/A |
| mips: | TODO |

2
Documentation/userspace-api/mseal.rst
View File

@ -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

1
arch/loongarch/Kconfig
View File

@ -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

4
arch/loongarch/kernel/vdso.c
View File

@ -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);