#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
-static inline void
-change_pte_range(pmd_t *pmd, unsigned long address,
- unsigned long size, pgprot_t newprot)
+static void change_pte_range(struct mm_struct *mm, pmd_t *pmd,
+ unsigned long addr, unsigned long end, pgprot_t newprot)
{
- pte_t * pte;
- unsigned long end;
-
- if (pmd_none(*pmd))
- return;
- if (pmd_bad(*pmd)) {
- pmd_ERROR(*pmd);
- pmd_clear(pmd);
- return;
- }
- pte = pte_offset_map(pmd, address);
- address &= ~PMD_MASK;
- end = address + size;
- if (end > PMD_SIZE)
- end = PMD_SIZE;
+ pte_t *pte;
+
+ pte = pte_offset_map(pmd, addr);
do {
if (pte_present(*pte)) {
- pte_t entry;
+ pte_t ptent;
/* Avoid an SMP race with hardware updated dirty/clean
* bits by wiping the pte and then setting the new pte
* into place.
*/
- entry = ptep_get_and_clear(pte);
- set_pte(pte, pte_modify(entry, newprot));
+ ptent = pte_modify(ptep_get_and_clear(mm, addr, pte), newprot);
+ set_pte_at(mm, addr, pte, ptent);
+ lazy_mmu_prot_update(ptent);
}
- address += PAGE_SIZE;
- pte++;
- } while (address && (address < end));
+ } while (pte++, addr += PAGE_SIZE, addr != end);
pte_unmap(pte - 1);
}
-static inline void
-change_pmd_range(pud_t *pud, unsigned long address,
- unsigned long size, pgprot_t newprot)
+static inline void change_pmd_range(struct mm_struct *mm, pud_t *pud,
+ unsigned long addr, unsigned long end, pgprot_t newprot)
{
- pmd_t * pmd;
- unsigned long end;
-
- if (pud_none(*pud))
- return;
- if (pud_bad(*pud)) {
- pud_ERROR(*pud);
- pud_clear(pud);
- return;
- }
- pmd = pmd_offset(pud, address);
- address &= ~PUD_MASK;
- end = address + size;
- if (end > PUD_SIZE)
- end = PUD_SIZE;
+ pmd_t *pmd;
+ unsigned long next;
+
+ pmd = pmd_offset(pud, addr);
do {
- change_pte_range(pmd, address, end - address, newprot);
- address = (address + PMD_SIZE) & PMD_MASK;
- pmd++;
- } while (address && (address < end));
+ next = pmd_addr_end(addr, end);
+ if (pmd_none_or_clear_bad(pmd))
+ continue;
+ change_pte_range(mm, pmd, addr, next, newprot);
+ } while (pmd++, addr = next, addr != end);
}
-static inline void
-change_pud_range(pgd_t *pgd, unsigned long address,
- unsigned long size, pgprot_t newprot)
+static inline void change_pud_range(struct mm_struct *mm, pgd_t *pgd,
+ unsigned long addr, unsigned long end, pgprot_t newprot)
{
- pud_t * pud;
- unsigned long end;
-
- if (pgd_none(*pgd))
- return;
- if (pgd_bad(*pgd)) {
- pgd_ERROR(*pgd);
- pgd_clear(pgd);
- return;
- }
- pud = pud_offset(pgd, address);
- address &= ~PGDIR_MASK;
- end = address + size;
- if (end > PGDIR_SIZE)
- end = PGDIR_SIZE;
+ pud_t *pud;
+ unsigned long next;
+
+ pud = pud_offset(pgd, addr);
do {
- change_pmd_range(pud, address, end - address, newprot);
- address = (address + PUD_SIZE) & PUD_MASK;
- pud++;
- } while (address && (address < end));
+ next = pud_addr_end(addr, end);
+ if (pud_none_or_clear_bad(pud))
+ continue;
+ change_pmd_range(mm, pud, addr, next, newprot);
+ } while (pud++, addr = next, addr != end);
}
-static void
-change_protection(struct vm_area_struct *vma, unsigned long start,
- unsigned long end, pgprot_t newprot)
+static void change_protection(struct vm_area_struct *vma,
+ unsigned long addr, unsigned long end, pgprot_t newprot)
{
- struct mm_struct *mm = current->mm;
+ struct mm_struct *mm = vma->vm_mm;
pgd_t *pgd;
- unsigned long beg = start, next;
- int i;
+ unsigned long next;
+ unsigned long start = addr;
- pgd = pgd_offset(mm, start);
- flush_cache_range(vma, beg, end);
- BUG_ON(start >= end);
+ BUG_ON(addr >= end);
+ pgd = pgd_offset(mm, addr);
+ flush_cache_range(vma, addr, end);
spin_lock(&mm->page_table_lock);
- for (i = pgd_index(start); i <= pgd_index(end-1); i++) {
- next = (start + PGDIR_SIZE) & PGDIR_MASK;
- if (next <= start || next > end)
- next = end;
- change_pud_range(pgd, start, next - start, newprot);
- start = next;
- pgd++;
- }
- flush_tlb_range(vma, beg, end);
+ do {
+ next = pgd_addr_end(addr, end);
+ if (pgd_none_or_clear_bad(pgd))
+ continue;
+ change_pud_range(mm, pgd, addr, next, newprot);
+ } while (pgd++, addr = next, addr != end);
+ flush_tlb_range(vma, start, end);
spin_unlock(&mm->page_table_lock);
}
mprotect_fixup(struct vm_area_struct *vma, struct vm_area_struct **pprev,
unsigned long start, unsigned long end, unsigned long newflags)
{
- struct mm_struct * mm = vma->vm_mm;
+ struct mm_struct *mm = vma->vm_mm;
unsigned long oldflags = vma->vm_flags;
long nrpages = (end - start) >> PAGE_SHIFT;
unsigned long charged = 0;
goto success;
}
+ *pprev = vma;
+
if (start != vma->vm_start) {
error = split_vma(mm, vma, start, 1);
if (error)
goto fail;
}
- /*
- * Unless it returns an error, this function always sets *pprev to
- * the first vma for which vma->vm_end >= end.
- */
- *pprev = vma;
if (end != vma->vm_end) {
error = split_vma(mm, vma, end, 0);
asmlinkage long
sys_mprotect(unsigned long start, size_t len, unsigned long prot)
{
- unsigned long vm_flags, nstart, end, tmp;
+ unsigned long vm_flags, nstart, end, tmp, reqprot;
struct vm_area_struct *vma, *prev;
int error = -EINVAL;
const int grows = prot & (PROT_GROWSDOWN|PROT_GROWSUP);
if (start & ~PAGE_MASK)
return -EINVAL;
+ if (!len)
+ return 0;
len = PAGE_ALIGN(len);
end = start + len;
- if (end < start)
+ if (end <= start)
return -ENOMEM;
if (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC | PROT_SEM))
return -EINVAL;
- if (end == start)
- return 0;
+
+ reqprot = prot;
/*
* Does the application expect PROT_READ to imply PROT_EXEC:
*/
goto out;
}
- error = security_file_mprotect(vma, prot);
+ error = security_file_mprotect(vma, reqprot, prot);
if (error)
goto out;
git://git.onelab.eu / linux-2.6.git / blobdiff