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-rw-r--r--mm/bootmem.c1
-rw-r--r--mm/filemap_xip.c11
-rw-r--r--mm/fremap.c23
-rw-r--r--mm/madvise.c2
-rw-r--r--mm/memory.c131
-rw-r--r--mm/mempolicy.c29
-rw-r--r--mm/mmap.c11
-rw-r--r--mm/mprotect.c8
-rw-r--r--mm/msync.c17
-rw-r--r--mm/page_alloc.c14
-rw-r--r--mm/rmap.c14
-rw-r--r--mm/shmem.c4
-rw-r--r--mm/swap.c4
13 files changed, 165 insertions, 104 deletions
diff --git a/mm/bootmem.c b/mm/bootmem.c
index a58699b6579..e8c567177dc 100644
--- a/mm/bootmem.c
+++ b/mm/bootmem.c
@@ -305,6 +305,7 @@ static unsigned long __init free_all_bootmem_core(pg_data_t *pgdat)
if (j + 16 < BITS_PER_LONG)
prefetchw(page + j + 16);
__ClearPageReserved(page + j);
+ set_page_count(page + j, 0);
}
__free_pages(page, order);
i += BITS_PER_LONG;
diff --git a/mm/filemap_xip.c b/mm/filemap_xip.c
index 8c199f53773..9354ee279b1 100644
--- a/mm/filemap_xip.c
+++ b/mm/filemap_xip.c
@@ -174,6 +174,7 @@ __xip_unmap (struct address_space * mapping,
unsigned long address;
pte_t *pte;
pte_t pteval;
+ struct page *page = ZERO_PAGE(address);
spin_lock(&mapping->i_mmap_lock);
vma_prio_tree_foreach(vma, &iter, &mapping->i_mmap, pgoff, pgoff) {
@@ -185,15 +186,17 @@ __xip_unmap (struct address_space * mapping,
* We need the page_table_lock to protect us from page faults,
* munmap, fork, etc...
*/
- pte = page_check_address(ZERO_PAGE(address), mm,
- address);
+ pte = page_check_address(page, mm, address);
if (!IS_ERR(pte)) {
/* Nuke the page table entry. */
flush_cache_page(vma, address, pte_pfn(*pte));
pteval = ptep_clear_flush(vma, address, pte);
+ page_remove_rmap(page);
+ dec_mm_counter(mm, file_rss);
BUG_ON(pte_dirty(pteval));
pte_unmap(pte);
spin_unlock(&mm->page_table_lock);
+ page_cache_release(page);
}
}
spin_unlock(&mapping->i_mmap_lock);
@@ -228,7 +231,7 @@ xip_file_nopage(struct vm_area_struct * area,
page = mapping->a_ops->get_xip_page(mapping, pgoff*(PAGE_SIZE/512), 0);
if (!IS_ERR(page)) {
- return page;
+ goto out;
}
if (PTR_ERR(page) != -ENODATA)
return NULL;
@@ -249,6 +252,8 @@ xip_file_nopage(struct vm_area_struct * area,
page = ZERO_PAGE(address);
}
+out:
+ page_cache_get(page);
return page;
}
diff --git a/mm/fremap.c b/mm/fremap.c
index fd7f2a17ff3..224cc1598b3 100644
--- a/mm/fremap.c
+++ b/mm/fremap.c
@@ -29,19 +29,20 @@ static inline void zap_pte(struct mm_struct *mm, struct vm_area_struct *vma,
return;
if (pte_present(pte)) {
unsigned long pfn = pte_pfn(pte);
+ struct page *page;
flush_cache_page(vma, addr, pfn);
pte = ptep_clear_flush(vma, addr, ptep);
- if (pfn_valid(pfn)) {
- struct page *page = pfn_to_page(pfn);
- if (!PageReserved(page)) {
- if (pte_dirty(pte))
- set_page_dirty(page);
- page_remove_rmap(page);
- page_cache_release(page);
- dec_mm_counter(mm, file_rss);
- }
+ if (unlikely(!pfn_valid(pfn))) {
+ print_bad_pte(vma, pte, addr);
+ return;
}
+ page = pfn_to_page(pfn);
+ if (pte_dirty(pte))
+ set_page_dirty(page);
+ page_remove_rmap(page);
+ page_cache_release(page);
+ dec_mm_counter(mm, file_rss);
} else {
if (!pte_file(pte))
free_swap_and_cache(pte_to_swp_entry(pte));
@@ -65,6 +66,8 @@ int install_page(struct mm_struct *mm, struct vm_area_struct *vma,
pgd_t *pgd;
pte_t pte_val;
+ BUG_ON(vma->vm_flags & VM_RESERVED);
+
pgd = pgd_offset(mm, addr);
spin_lock(&mm->page_table_lock);
@@ -125,6 +128,8 @@ int install_file_pte(struct mm_struct *mm, struct vm_area_struct *vma,
pgd_t *pgd;
pte_t pte_val;
+ BUG_ON(vma->vm_flags & VM_RESERVED);
+
pgd = pgd_offset(mm, addr);
spin_lock(&mm->page_table_lock);
diff --git a/mm/madvise.c b/mm/madvise.c
index 20e075d1c64..17aaf3e1644 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -126,7 +126,7 @@ static long madvise_dontneed(struct vm_area_struct * vma,
unsigned long start, unsigned long end)
{
*prev = vma;
- if ((vma->vm_flags & VM_LOCKED) || is_vm_hugetlb_page(vma))
+ if (vma->vm_flags & (VM_LOCKED|VM_HUGETLB|VM_RESERVED))
return -EINVAL;
if (unlikely(vma->vm_flags & VM_NONLINEAR)) {
diff --git a/mm/memory.c b/mm/memory.c
index da642b5528f..e83f9440bb6 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -343,6 +343,23 @@ static inline void add_mm_rss(struct mm_struct *mm, int file_rss, int anon_rss)
#define NO_RSS 2 /* Increment neither file_rss nor anon_rss */
/*
+ * This function is called to print an error when a pte in a
+ * !VM_RESERVED region is found pointing to an invalid pfn (which
+ * is an error.
+ *
+ * The calling function must still handle the error.
+ */
+void print_bad_pte(struct vm_area_struct *vma, pte_t pte, unsigned long vaddr)
+{
+ printk(KERN_ERR "Bad pte = %08llx, process = %s, "
+ "vm_flags = %lx, vaddr = %lx\n",
+ (long long)pte_val(pte),
+ (vma->vm_mm == current->mm ? current->comm : "???"),
+ vma->vm_flags, vaddr);
+ dump_stack();
+}
+
+/*
* copy one vm_area from one task to the other. Assumes the page tables
* already present in the new task to be cleared in the whole range
* covered by this vma.
@@ -353,9 +370,10 @@ static inline void add_mm_rss(struct mm_struct *mm, int file_rss, int anon_rss)
static inline int
copy_one_pte(struct mm_struct *dst_mm, struct mm_struct *src_mm,
- pte_t *dst_pte, pte_t *src_pte, unsigned long vm_flags,
+ pte_t *dst_pte, pte_t *src_pte, struct vm_area_struct *vma,
unsigned long addr)
{
+ unsigned long vm_flags = vma->vm_flags;
pte_t pte = *src_pte;
struct page *page;
unsigned long pfn;
@@ -375,18 +393,22 @@ copy_one_pte(struct mm_struct *dst_mm, struct mm_struct *src_mm,
goto out_set_pte;
}
+ /* If the region is VM_RESERVED, the mapping is not
+ * mapped via rmap - duplicate the pte as is.
+ */
+ if (vm_flags & VM_RESERVED)
+ goto out_set_pte;
+
pfn = pte_pfn(pte);
- /* the pte points outside of valid memory, the
- * mapping is assumed to be good, meaningful
- * and not mapped via rmap - duplicate the
- * mapping as is.
+ /* If the pte points outside of valid memory but
+ * the region is not VM_RESERVED, we have a problem.
*/
- page = NULL;
- if (pfn_valid(pfn))
- page = pfn_to_page(pfn);
+ if (unlikely(!pfn_valid(pfn))) {
+ print_bad_pte(vma, pte, addr);
+ goto out_set_pte; /* try to do something sane */
+ }
- if (!page || PageReserved(page))
- goto out_set_pte;
+ page = pfn_to_page(pfn);
/*
* If it's a COW mapping, write protect it both
@@ -418,7 +440,6 @@ static int copy_pte_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
unsigned long addr, unsigned long end)
{
pte_t *src_pte, *dst_pte;
- unsigned long vm_flags = vma->vm_flags;
int progress = 0;
int rss[NO_RSS+1], anon;
@@ -446,8 +467,7 @@ again:
progress++;
continue;
}
- anon = copy_one_pte(dst_mm, src_mm, dst_pte, src_pte,
- vm_flags, addr);
+ anon = copy_one_pte(dst_mm, src_mm, dst_pte, src_pte, vma,addr);
rss[anon]++;
progress += 8;
} while (dst_pte++, src_pte++, addr += PAGE_SIZE, addr != end);
@@ -541,10 +561,12 @@ int copy_page_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
return 0;
}
-static void zap_pte_range(struct mmu_gather *tlb, pmd_t *pmd,
+static void zap_pte_range(struct mmu_gather *tlb,
+ struct vm_area_struct *vma, pmd_t *pmd,
unsigned long addr, unsigned long end,
struct zap_details *details)
{
+ struct mm_struct *mm = tlb->mm;
pte_t *pte;
int file_rss = 0;
int anon_rss = 0;
@@ -556,11 +578,12 @@ static void zap_pte_range(struct mmu_gather *tlb, pmd_t *pmd,
continue;
if (pte_present(ptent)) {
struct page *page = NULL;
- unsigned long pfn = pte_pfn(ptent);
- if (pfn_valid(pfn)) {
- page = pfn_to_page(pfn);
- if (PageReserved(page))
- page = NULL;
+ if (!(vma->vm_flags & VM_RESERVED)) {
+ unsigned long pfn = pte_pfn(ptent);
+ if (unlikely(!pfn_valid(pfn)))
+ print_bad_pte(vma, ptent, addr);
+ else
+ page = pfn_to_page(pfn);
}
if (unlikely(details) && page) {
/*
@@ -580,7 +603,7 @@ static void zap_pte_range(struct mmu_gather *tlb, pmd_t *pmd,
page->index > details->last_index))
continue;
}
- ptent = ptep_get_and_clear_full(tlb->mm, addr, pte,
+ ptent = ptep_get_and_clear_full(mm, addr, pte,
tlb->fullmm);
tlb_remove_tlb_entry(tlb, pte, addr);
if (unlikely(!page))
@@ -588,7 +611,7 @@ static void zap_pte_range(struct mmu_gather *tlb, pmd_t *pmd,
if (unlikely(details) && details->nonlinear_vma
&& linear_page_index(details->nonlinear_vma,
addr) != page->index)
- set_pte_at(tlb->mm, addr, pte,
+ set_pte_at(mm, addr, pte,
pgoff_to_pte(page->index));
if (PageAnon(page))
anon_rss++;
@@ -611,14 +634,15 @@ static void zap_pte_range(struct mmu_gather *tlb, pmd_t *pmd,
continue;
if (!pte_file(ptent))
free_swap_and_cache(pte_to_swp_entry(ptent));
- pte_clear_full(tlb->mm, addr, pte, tlb->fullmm);
+ pte_clear_full(mm, addr, pte, tlb->fullmm);
} while (pte++, addr += PAGE_SIZE, addr != end);
- add_mm_rss(tlb->mm, -file_rss, -anon_rss);
+ add_mm_rss(mm, -file_rss, -anon_rss);
pte_unmap(pte - 1);
}
-static inline void zap_pmd_range(struct mmu_gather *tlb, pud_t *pud,
+static inline void zap_pmd_range(struct mmu_gather *tlb,
+ struct vm_area_struct *vma, pud_t *pud,
unsigned long addr, unsigned long end,
struct zap_details *details)
{
@@ -630,11 +654,12 @@ static inline void zap_pmd_range(struct mmu_gather *tlb, pud_t *pud,
next = pmd_addr_end(addr, end);
if (pmd_none_or_clear_bad(pmd))
continue;
- zap_pte_range(tlb, pmd, addr, next, details);
+ zap_pte_range(tlb, vma, pmd, addr, next, details);
} while (pmd++, addr = next, addr != end);
}
-static inline void zap_pud_range(struct mmu_gather *tlb, pgd_t *pgd,
+static inline void zap_pud_range(struct mmu_gather *tlb,
+ struct vm_area_struct *vma, pgd_t *pgd,
unsigned long addr, unsigned long end,
struct zap_details *details)
{
@@ -646,7 +671,7 @@ static inline void zap_pud_range(struct mmu_gather *tlb, pgd_t *pgd,
next = pud_addr_end(addr, end);
if (pud_none_or_clear_bad(pud))
continue;
- zap_pmd_range(tlb, pud, addr, next, details);
+ zap_pmd_range(tlb, vma, pud, addr, next, details);
} while (pud++, addr = next, addr != end);
}
@@ -667,7 +692,7 @@ static void unmap_page_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
next = pgd_addr_end(addr, end);
if (pgd_none_or_clear_bad(pgd))
continue;
- zap_pud_range(tlb, pgd, addr, next, details);
+ zap_pud_range(tlb, vma, pgd, addr, next, details);
} while (pgd++, addr = next, addr != end);
tlb_end_vma(tlb, vma);
}
@@ -967,7 +992,7 @@ int get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
continue;
}
- if (!vma || (vma->vm_flags & VM_IO)
+ if (!vma || (vma->vm_flags & (VM_IO | VM_RESERVED))
|| !(flags & vma->vm_flags))
return i ? : -EFAULT;
@@ -1027,8 +1052,7 @@ int get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
if (pages) {
pages[i] = page;
flush_dcache_page(page);
- if (!PageReserved(page))
- page_cache_get(page);
+ page_cache_get(page);
}
if (vmas)
vmas[i] = vma;
@@ -1051,7 +1075,11 @@ static int zeromap_pte_range(struct mm_struct *mm, pmd_t *pmd,
if (!pte)
return -ENOMEM;
do {
- pte_t zero_pte = pte_wrprotect(mk_pte(ZERO_PAGE(addr), prot));
+ struct page *page = ZERO_PAGE(addr);
+ pte_t zero_pte = pte_wrprotect(mk_pte(page, prot));
+ page_cache_get(page);
+ page_add_file_rmap(page);
+ inc_mm_counter(mm, file_rss);
BUG_ON(!pte_none(*pte));
set_pte_at(mm, addr, pte, zero_pte);
} while (pte++, addr += PAGE_SIZE, addr != end);
@@ -1132,8 +1160,7 @@ static int remap_pte_range(struct mm_struct *mm, pmd_t *pmd,
return -ENOMEM;
do {
BUG_ON(!pte_none(*pte));
- if (!pfn_valid(pfn) || PageReserved(pfn_to_page(pfn)))
- set_pte_at(mm, addr, pte, pfn_pte(pfn, prot));
+ set_pte_at(mm, addr, pte, pfn_pte(pfn, prot));
pfn++;
} while (pte++, addr += PAGE_SIZE, addr != end);
pte_unmap(pte - 1);
@@ -1195,8 +1222,8 @@ int remap_pfn_range(struct vm_area_struct *vma, unsigned long addr,
* rest of the world about it:
* VM_IO tells people not to look at these pages
* (accesses can have side effects).
- * VM_RESERVED tells swapout not to try to touch
- * this region.
+ * VM_RESERVED tells the core MM not to "manage" these pages
+ * (e.g. refcount, mapcount, try to swap them out).
*/
vma->vm_flags |= VM_IO | VM_RESERVED;
@@ -1256,11 +1283,13 @@ static int do_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
pte_t entry;
int ret = VM_FAULT_MINOR;
+ BUG_ON(vma->vm_flags & VM_RESERVED);
+
if (unlikely(!pfn_valid(pfn))) {
/*
* Page table corrupted: show pte and kill process.
*/
- pte_ERROR(orig_pte);
+ print_bad_pte(vma, orig_pte, address);
ret = VM_FAULT_OOM;
goto unlock;
}
@@ -1284,8 +1313,7 @@ static int do_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
/*
* Ok, we need to copy. Oh, well..
*/
- if (!PageReserved(old_page))
- page_cache_get(old_page);
+ page_cache_get(old_page);
pte_unmap(page_table);
spin_unlock(&mm->page_table_lock);
@@ -1308,14 +1336,10 @@ static int do_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
spin_lock(&mm->page_table_lock);
page_table = pte_offset_map(pmd, address);
if (likely(pte_same(*page_table, orig_pte))) {
- if (PageReserved(old_page))
+ page_remove_rmap(old_page);
+ if (!PageAnon(old_page)) {
inc_mm_counter(mm, anon_rss);
- else {
- page_remove_rmap(old_page);
- if (!PageAnon(old_page)) {
- inc_mm_counter(mm, anon_rss);
- dec_mm_counter(mm, file_rss);
- }
+ dec_mm_counter(mm, file_rss);
}
flush_cache_page(vma, address, pfn);
entry = mk_pte(new_page, vma->vm_page_prot);
@@ -1769,14 +1793,13 @@ static int do_anonymous_page(struct mm_struct *mm, struct vm_area_struct *vma,
unsigned long address, pte_t *page_table, pmd_t *pmd,
int write_access)
{
+ struct page *page = ZERO_PAGE(addr);
pte_t entry;
/* Mapping of ZERO_PAGE - vm_page_prot is readonly */
- entry = mk_pte(ZERO_PAGE(addr), vma->vm_page_prot);
+ entry = mk_pte(page, vma->vm_page_prot);
if (write_access) {
- struct page *page;
-
/* Allocate our own private page. */
pte_unmap(page_table);
spin_unlock(&mm->page_table_lock);
@@ -1800,6 +1823,10 @@ static int do_anonymous_page(struct mm_struct *mm, struct vm_area_struct *vma,
lru_cache_add_active(page);
SetPageReferenced(page);
page_add_anon_rmap(page, vma, address);
+ } else {
+ inc_mm_counter(mm, file_rss);
+ page_add_file_rmap(page);
+ page_cache_get(page);
}
set_pte_at(mm, address, page_table, entry);
@@ -1916,7 +1943,7 @@ retry:
inc_mm_counter(mm, anon_rss);
lru_cache_add_active(new_page);
page_add_anon_rmap(new_page, vma, address);
- } else if (!PageReserved(new_page)) {
+ } else if (!(vma->vm_flags & VM_RESERVED)) {
inc_mm_counter(mm, file_rss);
page_add_file_rmap(new_page);
}
@@ -1957,7 +1984,7 @@ static int do_file_page(struct mm_struct *mm, struct vm_area_struct *vma,
/*
* Page table corrupted: show pte and kill process.
*/
- pte_ERROR(orig_pte);
+ print_bad_pte(vma, orig_pte, address);
return VM_FAULT_OOM;
}
/* We can then assume vm->vm_ops && vma->vm_ops->populate */
@@ -2232,7 +2259,7 @@ static int __init gate_vma_init(void)
gate_vma.vm_start = FIXADDR_USER_START;
gate_vma.vm_end = FIXADDR_USER_END;
gate_vma.vm_page_prot = PAGE_READONLY;
- gate_vma.vm_flags = 0;
+ gate_vma.vm_flags = VM_RESERVED;
return 0;
}
__initcall(gate_vma_init);
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 43b1199af59..11d824f282f 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -223,13 +223,13 @@ static struct mempolicy *mpol_new(int mode, nodemask_t *nodes)
}
/* Ensure all existing pages follow the policy. */
-static int check_pte_range(struct mm_struct *mm, pmd_t *pmd,
+static int check_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
unsigned long addr, unsigned long end, nodemask_t *nodes)
{
pte_t *orig_pte;
pte_t *pte;
- spin_lock(&mm->page_table_lock);
+ spin_lock(&vma->vm_mm->page_table_lock);
orig_pte = pte = pte_offset_map(pmd, addr);
do {
unsigned long pfn;
@@ -238,18 +238,20 @@ static int check_pte_range(struct mm_struct *mm, pmd_t *pmd,
if (!pte_present(*pte))
continue;
pfn = pte_pfn(*pte);
- if (!pfn_valid(pfn))
+ if (!pfn_valid(pfn)) {
+ print_bad_pte(vma, *pte, addr);
continue;
+ }
nid = pfn_to_nid(pfn);
if (!node_isset(nid, *nodes))
break;
} while (pte++, addr += PAGE_SIZE, addr != end);
pte_unmap(orig_pte);
- spin_unlock(&mm->page_table_lock);
+ spin_unlock(&vma->vm_mm->page_table_lock);
return addr != end;
}
-static inline int check_pmd_range(struct mm_struct *mm, pud_t *pud,
+static inline int check_pmd_range(struct vm_area_struct *vma, pud_t *pud,
unsigned long addr, unsigned long end, nodemask_t *nodes)
{
pmd_t *pmd;
@@ -260,13 +262,13 @@ static inline int check_pmd_range(struct mm_struct *mm, pud_t *pud,
next = pmd_addr_end(addr, end);
if (pmd_none_or_clear_bad(pmd))
continue;
- if (check_pte_range(mm, pmd, addr, next, nodes))
+ if (check_pte_range(vma, pmd, addr, next, nodes))
return -EIO;
} while (pmd++, addr = next, addr != end);
return 0;
}
-static inline int check_pud_range(struct mm_struct *mm, pgd_t *pgd,
+static inline int check_pud_range(struct vm_area_struct *vma, pgd_t *pgd,
unsigned long addr, unsigned long end, nodemask_t *nodes)
{
pud_t *pud;
@@ -277,24 +279,24 @@ static inline int check_pud_range(struct mm_struct *mm, pgd_t *pgd,
next = pud_addr_end(addr, end);
if (pud_none_or_clear_bad(pud))
continue;
- if (check_pmd_range(mm, pud, addr, next, nodes))
+ if (check_pmd_range(vma, pud, addr, next, nodes))
return -EIO;
} while (pud++, addr = next, addr != end);
return 0;
}
-static inline int check_pgd_range(struct mm_struct *mm,
+static inline int check_pgd_range(struct vm_area_struct *vma,
unsigned long addr, unsigned long end, nodemask_t *nodes)
{
pgd_t *pgd;
unsigned long next;
- pgd = pgd_offset(mm, addr);
+ pgd = pgd_offset(vma->vm_mm, addr);
do {
next = pgd_addr_end(addr, end);
if (pgd_none_or_clear_bad(pgd))
continue;
- if (check_pud_range(mm, pgd, addr, next, nodes))
+ if (check_pud_range(vma, pgd, addr, next, nodes))
return -EIO;
} while (pgd++, addr = next, addr != end);
return 0;
@@ -311,6 +313,8 @@ check_range(struct mm_struct *mm, unsigned long start, unsigned long end,
first = find_vma(mm, start);
if (!first)
return ERR_PTR(-EFAULT);
+ if (first->vm_flags & VM_RESERVED)
+ return ERR_PTR(-EACCES);
prev = NULL;
for (vma = first; vma && vma->vm_start < end; vma = vma->vm_next) {
if (!vma->vm_next && vma->vm_end < end)
@@ -323,8 +327,7 @@ check_range(struct mm_struct *mm, unsigned long start, unsigned long end,
endvma = end;
if (vma->vm_start > start)
start = vma->vm_start;
- err = check_pgd_range(vma->vm_mm,
- start, endvma, nodes);
+ err = check_pgd_range(vma, start, endvma, nodes);
if (err) {
first = ERR_PTR(err);
break;
diff --git a/mm/mmap.c b/mm/mmap.c
index 459b9f068ad..8a111792b8d 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1088,6 +1088,17 @@ munmap_back:
error = file->f_op->mmap(file, vma);
if (error)
goto unmap_and_free_vma;
+ if ((vma->vm_flags & (VM_SHARED | VM_WRITE | VM_RESERVED))
+ == (VM_WRITE | VM_RESERVED)) {
+ printk(KERN_WARNING "program %s is using MAP_PRIVATE, "
+ "PROT_WRITE mmap of VM_RESERVED memory, which "
+ "is deprecated. Please report this to "
+ "linux-kernel@vger.kernel.org\n",current->comm);
+ if (vma->vm_ops && vma->vm_ops->close)
+ vma->vm_ops->close(vma);
+ error = -EACCES;
+ goto unmap_and_free_vma;
+ }
} else if (vm_flags & VM_SHARED) {
error = shmem_zero_setup(vma);
if (error)
diff --git a/mm/mprotect.c b/mm/mprotect.c
index b426f01c5e9..672a76fddd5 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -125,6 +125,14 @@ mprotect_fixup(struct vm_area_struct *vma, struct vm_area_struct **pprev,
* a MAP_NORESERVE private mapping to writable will now reserve.
*/
if (newflags & VM_WRITE) {
+ if (oldflags & VM_RESERVED) {
+ BUG_ON(oldflags & VM_WRITE);
+ printk(KERN_WARNING "program %s is using MAP_PRIVATE, "
+ "PROT_WRITE mprotect of VM_RESERVED memory, "
+ "which is deprecated. Please report this to "
+ "linux-kernel@vger.kernel.org\n",current->comm);
+ return -EACCES;
+ }
if (!(oldflags & (VM_ACCOUNT|VM_WRITE|VM_SHARED|VM_HUGETLB))) {
charged = nrpages;
if (security_vm_enough_memory(charged))
diff --git a/mm/msync.c b/mm/msync.c
index 3b5f1c521d4..86039548606 100644
--- a/mm/msync.c
+++ b/mm/msync.c
@@ -25,6 +25,7 @@
static void msync_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
unsigned long addr, unsigned long end)
{
+ struct mm_struct *mm = vma->vm_mm;
pte_t *pte;
int progress = 0;
@@ -37,7 +38,7 @@ again:
if (progress >= 64) {
progress = 0;
if (need_resched() ||
- need_lockbreak(&vma->vm_mm->page_table_lock))
+ need_lockbreak(&mm->page_table_lock))
break;
}
progress++;
@@ -46,11 +47,11 @@ again:
if (!pte_maybe_dirty(*pte))
continue;
pfn = pte_pfn(*pte);
- if (!pfn_valid(pfn))
+ if (unlikely(!pfn_valid(pfn))) {
+ print_bad_pte(vma, *pte, addr);
continue;
+ }
page = pfn_to_page(pfn);
- if (PageReserved(page))
- continue;
if (ptep_clear_flush_dirty(vma, addr, pte) ||
page_test_and_clear_dirty(page))
@@ -58,7 +59,7 @@ again:
progress += 3;
} while (pte++, addr += PAGE_SIZE, addr != end);
pte_unmap(pte - 1);
- cond_resched_lock(&vma->vm_mm->page_table_lock);
+ cond_resched_lock(&mm->page_table_lock);
if (addr != end)
goto again;
}
@@ -102,8 +103,10 @@ static void msync_page_range(struct vm_area_struct *vma,
/* For hugepages we can't go walking the page table normally,
* but that's ok, hugetlbfs is memory based, so we don't need
- * to do anything more on an msync() */
- if (is_vm_hugetlb_page(vma))
+ * to do anything more on an msync().
+ * Can't do anything with VM_RESERVED regions either.
+ */
+ if (vma->vm_flags & (VM_HUGETLB|VM_RESERVED))
return;
BUG_ON(addr >= end);
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 60663232fbb..0541288ebf4 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -114,7 +114,8 @@ static void bad_page(const char *function, struct page *page)
1 << PG_reclaim |
1 << PG_slab |
1 << PG_swapcache |
- 1 << PG_writeback);
+ 1 << PG_writeback |
+ 1 << PG_reserved );
set_page_count(page, 0);
reset_page_mapcount(page);
page->mapping = NULL;
@@ -244,7 +245,6 @@ static inline int page_is_buddy(struct page *page, int order)
{
if (PagePrivate(page) &&
(page_order(page) == order) &&
- !PageReserved(page) &&
page_count(page) == 0)
return 1;
return 0;
@@ -327,7 +327,8 @@ static inline void free_pages_check(const char *function, struct page *page)
1 << PG_reclaim |
1 << PG_slab |
1 << PG_swapcache |
- 1 << PG_writeback )))
+ 1 << PG_writeback |
+ 1 << PG_reserved )))
bad_page(function, page);
if (PageDirty(page))
__ClearPageDirty(page);
@@ -455,7 +456,8 @@ static void prep_new_page(struct page *page, int order)
1 << PG_reclaim |
1 << PG_slab |
1 << PG_swapcache |
- 1 << PG_writeback )))
+ 1 << PG_writeback |
+ 1 << PG_reserved )))
bad_page(__FUNCTION__, page);
page->flags &= ~(1 << PG_uptodate | 1 << PG_error |
@@ -1016,7 +1018,7 @@ void __pagevec_free(struct pagevec *pvec)
fastcall void __free_pages(struct page *page, unsigned int order)
{
- if (!PageReserved(page) && put_page_testzero(page)) {
+ if (put_page_testzero(page)) {
if (order == 0)
free_hot_page(page);
else
@@ -1674,7 +1676,7 @@ void __init memmap_init_zone(unsigned long size, int nid, unsigned long zone,
continue;
page = pfn_to_page(pfn);
set_page_links(page, zone, nid, pfn);
- set_page_count(page, 0);
+ set_page_count(page, 1);
reset_page_mapcount(page);
SetPageReserved(page);
INIT_LIST_HEAD(&page->lru);
diff --git a/mm/rmap.c b/mm/rmap.c
index 504757624cc..f69d5342ce7 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -443,8 +443,6 @@ int page_referenced(struct page *page, int is_locked, int ignore_token)
void page_add_anon_rmap(struct page *page,
struct vm_area_struct *vma, unsigned long address)
{
- BUG_ON(PageReserved(page));
-
if (atomic_inc_and_test(&page->_mapcount)) {
struct anon_vma *anon_vma = vma->anon_vma;
@@ -468,8 +466,7 @@ void page_add_anon_rmap(struct page *page,
void page_add_file_rmap(struct page *page)
{
BUG_ON(PageAnon(page));
- if (!pfn_valid(page_to_pfn(page)) || PageReserved(page))
- return;
+ BUG_ON(!pfn_valid(page_to_pfn(page)));
if (atomic_inc_and_test(&page->_mapcount))
inc_page_state(nr_mapped);
@@ -483,8 +480,6 @@ void page_add_file_rmap(struct page *page)
*/
void page_remove_rmap(struct page *page)
{
- BUG_ON(PageReserved(page));
-
if (atomic_add_negative(-1, &page->_mapcount)) {
BUG_ON(page_mapcount(page) < 0);
/*
@@ -640,13 +635,13 @@ static void try_to_unmap_cluster(unsigned long cursor,
continue;
pfn = pte_pfn(*pte);
- if (!pfn_valid(pfn))
+ if (unlikely(!pfn_valid(pfn))) {
+ print_bad_pte(vma, *pte, address);
continue;
+ }
page = pfn_to_page(pfn);
BUG_ON(PageAnon(page));
- if (PageReserved(page))
- continue;
if (ptep_clear_flush_young(vma, address, pte))
continue;
@@ -808,7 +803,6 @@ int try_to_unmap(struct page *page)
{
int ret;
- BUG_ON(PageReserved(page));
BUG_ON(!PageLocked(page));
if (PageAnon(page))
diff --git a/mm/shmem.c b/mm/shmem.c
index 6796311a23e..37777f4c11f 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -1506,8 +1506,10 @@ static void do_shmem_file_read(struct file *filp, loff_t *ppos, read_descriptor_
*/
if (!offset)
mark_page_accessed(page);
- } else
+ } else {
page = ZERO_PAGE(0);
+ page_cache_get(page);
+ }
/*
* Ok, we have the page, and it's up-to-date, so
diff --git a/mm/swap.c b/mm/swap.c
index 7771d2803f6..21d15f99805 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -48,7 +48,7 @@ void put_page(struct page *page)
}
return;
}
- if (!PageReserved(page) && put_page_testzero(page))
+ if (put_page_testzero(page))
__page_cache_release(page);
}
EXPORT_SYMBOL(put_page);
@@ -215,7 +215,7 @@ void release_pages(struct page **pages, int nr, int cold)
struct page *page = pages[i];
struct zone *pagezone;
- if (PageReserved(page) || !put_page_testzero(page))
+ if (!put_page_testzero(page))
continue;
pagezone = page_zone(page);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-19 19:03:16 +0000