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authorOleg Nesterov <oleg@redhat.com>2016-05-20 16:58:36 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-05-20 17:58:30 -0700
commitd2005e3f41d4f9299e2df6a967c8beb5086967a9 (patch)
tree075dc5ba6de68cfe96acdb91478595e7d3366f2e /fs
parentcd33a76b0f2805fb0d6a05a2d53933f3817ccc9b (diff)
downloadlinux-d2005e3f41d4f9299e2df6a967c8beb5086967a9.tar.bz2
userfaultfd: don't pin the user memory in userfaultfd_file_create()
userfaultfd_file_create() increments mm->mm_users; this means that the memory won't be unmapped/freed if mm owner exits/execs, and UFFDIO_COPY after that can populate the orphaned mm more. Change userfaultfd_file_create() and userfaultfd_ctx_put() to use mm->mm_count to pin mm_struct. This means that atomic_inc_not_zero(mm->mm_users) is needed when we are going to actually play with this memory. Except handle_userfault() path doesn't need this, the caller must already have a reference. The patch adds the new trivial helper, mmget_not_zero(), it can have more users. Link: http://lkml.kernel.org/r/20160516172254.GA8595@redhat.com Signed-off-by: Oleg Nesterov <oleg@redhat.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Michal Hocko <mhocko@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/userfaultfd.c41
1 files changed, 28 insertions, 13 deletions
diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c
index 66cdb44616d5..2d97952e341a 100644
--- a/fs/userfaultfd.c
+++ b/fs/userfaultfd.c
@@ -137,7 +137,7 @@ static void userfaultfd_ctx_put(struct userfaultfd_ctx *ctx)
VM_BUG_ON(waitqueue_active(&ctx->fault_wqh));
VM_BUG_ON(spin_is_locked(&ctx->fd_wqh.lock));
VM_BUG_ON(waitqueue_active(&ctx->fd_wqh));
- mmput(ctx->mm);
+ mmdrop(ctx->mm);
kmem_cache_free(userfaultfd_ctx_cachep, ctx);
}
}
@@ -434,6 +434,9 @@ static int userfaultfd_release(struct inode *inode, struct file *file)
ACCESS_ONCE(ctx->released) = true;
+ if (!mmget_not_zero(mm))
+ goto wakeup;
+
/*
* Flush page faults out of all CPUs. NOTE: all page faults
* must be retried without returning VM_FAULT_SIGBUS if
@@ -466,7 +469,8 @@ static int userfaultfd_release(struct inode *inode, struct file *file)
vma->vm_userfaultfd_ctx = NULL_VM_UFFD_CTX;
}
up_write(&mm->mmap_sem);
-
+ mmput(mm);
+wakeup:
/*
* After no new page faults can wait on this fault_*wqh, flush
* the last page faults that may have been already waiting on
@@ -760,10 +764,12 @@ static int userfaultfd_register(struct userfaultfd_ctx *ctx,
start = uffdio_register.range.start;
end = start + uffdio_register.range.len;
+ ret = -ENOMEM;
+ if (!mmget_not_zero(mm))
+ goto out;
+
down_write(&mm->mmap_sem);
vma = find_vma_prev(mm, start, &prev);
-
- ret = -ENOMEM;
if (!vma)
goto out_unlock;
@@ -864,6 +870,7 @@ static int userfaultfd_register(struct userfaultfd_ctx *ctx,
} while (vma && vma->vm_start < end);
out_unlock:
up_write(&mm->mmap_sem);
+ mmput(mm);
if (!ret) {
/*
* Now that we scanned all vmas we can already tell
@@ -902,10 +909,12 @@ static int userfaultfd_unregister(struct userfaultfd_ctx *ctx,
start = uffdio_unregister.start;
end = start + uffdio_unregister.len;
+ ret = -ENOMEM;
+ if (!mmget_not_zero(mm))
+ goto out;
+
down_write(&mm->mmap_sem);
vma = find_vma_prev(mm, start, &prev);
-
- ret = -ENOMEM;
if (!vma)
goto out_unlock;
@@ -998,6 +1007,7 @@ static int userfaultfd_unregister(struct userfaultfd_ctx *ctx,
} while (vma && vma->vm_start < end);
out_unlock:
up_write(&mm->mmap_sem);
+ mmput(mm);
out:
return ret;
}
@@ -1067,9 +1077,11 @@ static int userfaultfd_copy(struct userfaultfd_ctx *ctx,
goto out;
if (uffdio_copy.mode & ~UFFDIO_COPY_MODE_DONTWAKE)
goto out;
-
- ret = mcopy_atomic(ctx->mm, uffdio_copy.dst, uffdio_copy.src,
- uffdio_copy.len);
+ if (mmget_not_zero(ctx->mm)) {
+ ret = mcopy_atomic(ctx->mm, uffdio_copy.dst, uffdio_copy.src,
+ uffdio_copy.len);
+ mmput(ctx->mm);
+ }
if (unlikely(put_user(ret, &user_uffdio_copy->copy)))
return -EFAULT;
if (ret < 0)
@@ -1110,8 +1122,11 @@ static int userfaultfd_zeropage(struct userfaultfd_ctx *ctx,
if (uffdio_zeropage.mode & ~UFFDIO_ZEROPAGE_MODE_DONTWAKE)
goto out;
- ret = mfill_zeropage(ctx->mm, uffdio_zeropage.range.start,
- uffdio_zeropage.range.len);
+ if (mmget_not_zero(ctx->mm)) {
+ ret = mfill_zeropage(ctx->mm, uffdio_zeropage.range.start,
+ uffdio_zeropage.range.len);
+ mmput(ctx->mm);
+ }
if (unlikely(put_user(ret, &user_uffdio_zeropage->zeropage)))
return -EFAULT;
if (ret < 0)
@@ -1289,12 +1304,12 @@ static struct file *userfaultfd_file_create(int flags)
ctx->released = false;
ctx->mm = current->mm;
/* prevent the mm struct to be freed */
- atomic_inc(&ctx->mm->mm_users);
+ atomic_inc(&ctx->mm->mm_count);
file = anon_inode_getfile("[userfaultfd]", &userfaultfd_fops, ctx,
O_RDWR | (flags & UFFD_SHARED_FCNTL_FLAGS));
if (IS_ERR(file)) {
- mmput(ctx->mm);
+ mmdrop(ctx->mm);
kmem_cache_free(userfaultfd_ctx_cachep, ctx);
}
out: