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7c8d42fdf1
The alignment check in prepare_hugepage_range() is wrong for 2 GB
hugepages, it only checks for 1 MB hugepage alignment.
This can result in kernel crash in __unmap_hugepage_range() at the
BUG_ON(start & ~huge_page_mask(h)) alignment check, for mappings
created with MAP_FIXED at unaligned address.
Fix this by correctly handling multiple hugepage sizes, similar to the
generic version of prepare_hugepage_range().
Fixes: d08de8e2d8 ("s390/mm: add support for 2GB hugepages")
Cc: <stable@vger.kernel.org> # 4.8+
Acked-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
146 lines
3.2 KiB
C
146 lines
3.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* IBM System z Huge TLB Page Support for Kernel.
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*
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* Copyright IBM Corp. 2008
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* Author(s): Gerald Schaefer <gerald.schaefer@de.ibm.com>
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*/
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#ifndef _ASM_S390_HUGETLB_H
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#define _ASM_S390_HUGETLB_H
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#include <linux/pgtable.h>
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#include <asm/page.h>
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#define hugetlb_free_pgd_range free_pgd_range
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#define hugepages_supported() (MACHINE_HAS_EDAT1)
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void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep, pte_t pte);
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pte_t huge_ptep_get(pte_t *ptep);
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pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
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unsigned long addr, pte_t *ptep);
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/*
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* If the arch doesn't supply something else, assume that hugepage
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* size aligned regions are ok without further preparation.
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*/
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static inline int prepare_hugepage_range(struct file *file,
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unsigned long addr, unsigned long len)
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{
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struct hstate *h = hstate_file(file);
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if (len & ~huge_page_mask(h))
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return -EINVAL;
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if (addr & ~huge_page_mask(h))
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return -EINVAL;
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return 0;
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}
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static inline void arch_clear_hugepage_flags(struct page *page)
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{
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clear_bit(PG_arch_1, &page->flags);
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}
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#define arch_clear_hugepage_flags arch_clear_hugepage_flags
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static inline void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep, unsigned long sz)
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{
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if ((pte_val(*ptep) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3)
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set_pte(ptep, __pte(_REGION3_ENTRY_EMPTY));
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else
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set_pte(ptep, __pte(_SEGMENT_ENTRY_EMPTY));
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}
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static inline pte_t huge_ptep_clear_flush(struct vm_area_struct *vma,
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unsigned long address, pte_t *ptep)
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{
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return huge_ptep_get_and_clear(vma->vm_mm, address, ptep);
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}
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static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
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unsigned long addr, pte_t *ptep,
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pte_t pte, int dirty)
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{
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int changed = !pte_same(huge_ptep_get(ptep), pte);
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if (changed) {
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huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
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set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
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}
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return changed;
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}
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static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
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unsigned long addr, pte_t *ptep)
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{
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pte_t pte = huge_ptep_get_and_clear(mm, addr, ptep);
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set_huge_pte_at(mm, addr, ptep, pte_wrprotect(pte));
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}
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static inline pte_t mk_huge_pte(struct page *page, pgprot_t pgprot)
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{
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return mk_pte(page, pgprot);
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}
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static inline int huge_pte_none(pte_t pte)
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{
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return pte_none(pte);
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}
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static inline int huge_pte_none_mostly(pte_t pte)
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{
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return huge_pte_none(pte);
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}
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static inline int huge_pte_write(pte_t pte)
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{
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return pte_write(pte);
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}
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static inline int huge_pte_dirty(pte_t pte)
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{
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return pte_dirty(pte);
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}
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static inline pte_t huge_pte_mkwrite(pte_t pte)
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{
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return pte_mkwrite(pte);
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}
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static inline pte_t huge_pte_mkdirty(pte_t pte)
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{
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return pte_mkdirty(pte);
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}
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static inline pte_t huge_pte_wrprotect(pte_t pte)
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{
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return pte_wrprotect(pte);
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}
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static inline pte_t huge_pte_modify(pte_t pte, pgprot_t newprot)
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{
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return pte_modify(pte, newprot);
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}
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static inline pte_t huge_pte_mkuffd_wp(pte_t pte)
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{
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return pte;
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}
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static inline pte_t huge_pte_clear_uffd_wp(pte_t pte)
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{
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return pte;
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}
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static inline int huge_pte_uffd_wp(pte_t pte)
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{
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return 0;
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}
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static inline bool gigantic_page_runtime_supported(void)
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{
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return true;
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}
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#endif /* _ASM_S390_HUGETLB_H */
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