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Diffstat (limited to 'mm/mmap.c')
-rw-r--r--mm/mmap.c27
1 files changed, 23 insertions, 4 deletions
diff --git a/mm/mmap.c b/mm/mmap.c
index b9274a0c82c9..11e1f2ca72af 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -178,7 +178,8 @@ SYSCALL_DEFINE1(brk, unsigned long, brk)
unsigned long min_brk;
bool populate;
- down_write(&mm->mmap_sem);
+ if (down_write_killable(&mm->mmap_sem))
+ return -EINTR;
#ifdef CONFIG_COMPAT_BRK
/*
@@ -1332,7 +1333,7 @@ SYSCALL_DEFINE6(mmap_pgoff, unsigned long, addr, unsigned long, len,
flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
- retval = vm_mmap_pgoff(file, addr, len, prot, flags, pgoff);
+ retval = vm_mmap_pgoff(file, addr, len, prot, flags, pgoff, true);
out_fput:
if (file)
fput(file);
@@ -2493,6 +2494,10 @@ int vm_munmap(unsigned long start, size_t len)
int ret;
struct mm_struct *mm = current->mm;
+ /*
+ * XXX convert to down_write_killable as soon as all users are able
+ * to handle the error.
+ */
down_write(&mm->mmap_sem);
ret = do_munmap(mm, start, len);
up_write(&mm->mmap_sem);
@@ -2502,8 +2507,15 @@ EXPORT_SYMBOL(vm_munmap);
SYSCALL_DEFINE2(munmap, unsigned long, addr, size_t, len)
{
+ int ret;
+ struct mm_struct *mm = current->mm;
+
profile_munmap(addr);
- return vm_munmap(addr, len);
+ if (down_write_killable(&mm->mmap_sem))
+ return -EINTR;
+ ret = do_munmap(mm, addr, len);
+ up_write(&mm->mmap_sem);
+ return ret;
}
@@ -2535,7 +2547,9 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size,
if (pgoff + (size >> PAGE_SHIFT) < pgoff)
return ret;
- down_write(&mm->mmap_sem);
+ if (down_write_killable(&mm->mmap_sem))
+ return -EINTR;
+
vma = find_vma(mm, start);
if (!vma || !(vma->vm_flags & VM_SHARED))
@@ -2700,6 +2714,11 @@ unsigned long vm_brk(unsigned long addr, unsigned long len)
unsigned long ret;
bool populate;
+ /*
+ * XXX not all users are chcecking the return value, convert
+ * to down_write_killable after they are able to cope with
+ * error
+ */
down_write(&mm->mmap_sem);
ret = do_brk(addr, len);
populate = ((mm->def_flags & VM_LOCKED) != 0);