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| author | Huacai Chen <chenhuacai@loongson.cn> | 2025-12-31 15:19:10 +0800 |
|---|---|---|
| committer | Huacai Chen <chenhuacai@loongson.cn> | 2025-12-31 15:19:10 +0800 |
| commit | d5be446948b379f1d1a8e7bc6656d13f44c5c7b1 (patch) | |
| tree | 9bda87ca4967e9caabe36b1b72008f26b3a1ddc6 /arch | |
| parent | 807e5d383ca8bf6c0ac0fddd5edf9dda92e97c5d (diff) | |
| download | linux-d5be446948b379f1d1a8e7bc6656d13f44c5c7b1.tar.gz linux-d5be446948b379f1d1a8e7bc6656d13f44c5c7b1.tar.bz2 linux-d5be446948b379f1d1a8e7bc6656d13f44c5c7b1.zip | |
LoongArch: Set correct protection_map[] for VM_NONE/VM_SHARED
For 32BIT platform _PAGE_PROTNONE is 0, so set a VMA to be VM_NONE or
VM_SHARED will make pages non-present, then cause Oops with kernel page
fault.
Fix it by set correct protection_map[] for VM_NONE/VM_SHARED, replacing
_PAGE_PROTNONE with _PAGE_PRESENT.
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/loongarch/mm/cache.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/arch/loongarch/mm/cache.c b/arch/loongarch/mm/cache.c index 6be04d36ca07..496916845ff7 100644 --- a/arch/loongarch/mm/cache.c +++ b/arch/loongarch/mm/cache.c @@ -160,8 +160,8 @@ void cpu_cache_init(void) static const pgprot_t protection_map[16] = { [VM_NONE] = __pgprot(_CACHE_CC | _PAGE_USER | - _PAGE_PROTNONE | _PAGE_NO_EXEC | - _PAGE_NO_READ), + _PAGE_NO_EXEC | _PAGE_NO_READ | + (_PAGE_PROTNONE ? : _PAGE_PRESENT)), [VM_READ] = __pgprot(_CACHE_CC | _PAGE_VALID | _PAGE_USER | _PAGE_PRESENT | _PAGE_NO_EXEC), @@ -180,8 +180,8 @@ static const pgprot_t protection_map[16] = { [VM_EXEC | VM_WRITE | VM_READ] = __pgprot(_CACHE_CC | _PAGE_VALID | _PAGE_USER | _PAGE_PRESENT), [VM_SHARED] = __pgprot(_CACHE_CC | _PAGE_USER | - _PAGE_PROTNONE | _PAGE_NO_EXEC | - _PAGE_NO_READ), + _PAGE_NO_EXEC | _PAGE_NO_READ | + (_PAGE_PROTNONE ? : _PAGE_PRESENT)), [VM_SHARED | VM_READ] = __pgprot(_CACHE_CC | _PAGE_VALID | _PAGE_USER | _PAGE_PRESENT | _PAGE_NO_EXEC), |