Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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>
+4
-4
+4
-4
arch/loongarch/mm/cache.c
+4
-4
arch/loongarch/mm/cache.c
···
160
160
161
161
static const pgprot_t protection_map[16] = {
162
162
[VM_NONE] = __pgprot(_CACHE_CC | _PAGE_USER |
163
-
_PAGE_PROTNONE | _PAGE_NO_EXEC |
164
-
_PAGE_NO_READ),
163
+
_PAGE_NO_EXEC | _PAGE_NO_READ |
164
+
(_PAGE_PROTNONE ? : _PAGE_PRESENT)),
165
165
[VM_READ] = __pgprot(_CACHE_CC | _PAGE_VALID |
166
166
_PAGE_USER | _PAGE_PRESENT |
167
167
_PAGE_NO_EXEC),
···
180
180
[VM_EXEC | VM_WRITE | VM_READ] = __pgprot(_CACHE_CC | _PAGE_VALID |
181
181
_PAGE_USER | _PAGE_PRESENT),
182
182
[VM_SHARED] = __pgprot(_CACHE_CC | _PAGE_USER |
183
-
_PAGE_PROTNONE | _PAGE_NO_EXEC |
184
-
_PAGE_NO_READ),
183
+
_PAGE_NO_EXEC | _PAGE_NO_READ |
184
+
(_PAGE_PROTNONE ? : _PAGE_PRESENT)),
185
185
[VM_SHARED | VM_READ] = __pgprot(_CACHE_CC | _PAGE_VALID |
186
186
_PAGE_USER | _PAGE_PRESENT |
187
187
_PAGE_NO_EXEC),