summaryrefslogtreecommitdiff
path: root/mm/mremap.c
diff options
context:
space:
mode:
Diffstat (limited to 'mm/mremap.c')
-rw-r--r--mm/mremap.c28
1 files changed, 15 insertions, 13 deletions
diff --git a/mm/mremap.c b/mm/mremap.c
index e1031e1f6a61..463a25705ac6 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -19,6 +19,7 @@
#include <linux/security.h>
#include <linux/syscalls.h>
#include <linux/mmu_notifier.h>
+#include <linux/sched/sysctl.h>
#include <asm/uaccess.h>
#include <asm/cacheflush.h>
@@ -134,7 +135,7 @@ static void move_ptes(struct vm_area_struct *vma, pmd_t *old_pmd,
pte_unmap(new_pte - 1);
pte_unmap_unlock(old_pte - 1, old_ptl);
if (anon_vma)
- anon_vma_unlock(anon_vma);
+ anon_vma_unlock_write(anon_vma);
if (mapping)
mutex_unlock(&mapping->i_mmap_mutex);
}
@@ -208,7 +209,7 @@ unsigned long move_page_tables(struct vm_area_struct *vma,
static unsigned long move_vma(struct vm_area_struct *vma,
unsigned long old_addr, unsigned long old_len,
- unsigned long new_len, unsigned long new_addr)
+ unsigned long new_len, unsigned long new_addr, bool *locked)
{
struct mm_struct *mm = vma->vm_mm;
struct vm_area_struct *new_vma;
@@ -299,9 +300,7 @@ static unsigned long move_vma(struct vm_area_struct *vma,
if (vm_flags & VM_LOCKED) {
mm->locked_vm += new_len >> PAGE_SHIFT;
- if (new_len > old_len)
- mlock_vma_pages_range(new_vma, new_addr + old_len,
- new_addr + new_len);
+ *locked = true;
}
return new_addr;
@@ -366,9 +365,8 @@ Eagain:
return ERR_PTR(-EAGAIN);
}
-static unsigned long mremap_to(unsigned long addr,
- unsigned long old_len, unsigned long new_addr,
- unsigned long new_len)
+static unsigned long mremap_to(unsigned long addr, unsigned long old_len,
+ unsigned long new_addr, unsigned long new_len, bool *locked)
{
struct mm_struct *mm = current->mm;
struct vm_area_struct *vma;
@@ -418,7 +416,7 @@ static unsigned long mremap_to(unsigned long addr,
if (ret & ~PAGE_MASK)
goto out1;
- ret = move_vma(vma, addr, old_len, new_len, new_addr);
+ ret = move_vma(vma, addr, old_len, new_len, new_addr, locked);
if (!(ret & ~PAGE_MASK))
goto out;
out1:
@@ -456,6 +454,7 @@ SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned long, old_len,
struct vm_area_struct *vma;
unsigned long ret = -EINVAL;
unsigned long charged = 0;
+ bool locked = false;
down_write(&current->mm->mmap_sem);
@@ -478,7 +477,8 @@ SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned long, old_len,
if (flags & MREMAP_FIXED) {
if (flags & MREMAP_MAYMOVE)
- ret = mremap_to(addr, old_len, new_addr, new_len);
+ ret = mremap_to(addr, old_len, new_addr, new_len,
+ &locked);
goto out;
}
@@ -520,8 +520,8 @@ SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned long, old_len,
vm_stat_account(mm, vma->vm_flags, vma->vm_file, pages);
if (vma->vm_flags & VM_LOCKED) {
mm->locked_vm += pages;
- mlock_vma_pages_range(vma, addr + old_len,
- addr + new_len);
+ locked = true;
+ new_addr = addr;
}
ret = addr;
goto out;
@@ -547,11 +547,13 @@ SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned long, old_len,
goto out;
}
- ret = move_vma(vma, addr, old_len, new_len, new_addr);
+ ret = move_vma(vma, addr, old_len, new_len, new_addr, &locked);
}
out:
if (ret & ~PAGE_MASK)
vm_unacct_memory(charged);
up_write(&current->mm->mmap_sem);
+ if (locked && new_len > old_len)
+ mm_populate(new_addr + old_len, new_len - old_len);
return ret;
}