diff mbox series

[v3,01/18,stable-5.15.y] gup: Turn fault_in_pages_{readable,writeable} into fault_in_{readable,writeable}

Message ID 92b6e65e73dd2764bef59e0e20b65143ab28914a.1649951733.git.anand.jain@oracle.com
State New
Headers show
Series Fix mmap + page fault deadlocks | expand

Commit Message

Anand Jain April 14, 2022, 10:28 p.m. UTC 
From: Andreas Gruenbacher <agruenba@redhat.com>

commit bb523b406c849eef8f265a07cd7f320f1f177743 upstream

Turn fault_in_pages_{readable,writeable} into versions that return the
number of bytes not faulted in, similar to copy_to_user, instead of
returning a non-zero value when any of the requested pages couldn't be
faulted in.  This supports the existing users that require all pages to
be faulted in as well as new users that are happy if any pages can be
faulted in.

Rename the functions to fault_in_{readable,writeable} to make sure
this change doesn't silently break things.

Neither of these functions is entirely trivial and it doesn't seem
useful to inline them, so move them to mm/gup.c.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Anand Jain <anand.jain@oracle.com>
---
 arch/powerpc/kernel/kvm.c           |  3 +-
 arch/powerpc/kernel/signal_32.c     |  4 +-
 arch/powerpc/kernel/signal_64.c     |  2 +-
 arch/x86/kernel/fpu/signal.c        |  7 ++-
 drivers/gpu/drm/armada/armada_gem.c |  7 ++-
 fs/btrfs/ioctl.c                    |  5 +-
 include/linux/pagemap.h             | 57 ++---------------------
 lib/iov_iter.c                      | 10 ++--
 mm/filemap.c                        |  2 +-
 mm/gup.c                            | 72 +++++++++++++++++++++++++++++
 10 files changed, 93 insertions(+), 76 deletions(-)
diff mbox series

Patch

diff --git a/arch/powerpc/kernel/kvm.c b/arch/powerpc/kernel/kvm.c
index d89cf802d9aa..6568823cf306 100644
--- a/arch/powerpc/kernel/kvm.c
+++ b/arch/powerpc/kernel/kvm.c
@@ -669,7 +669,8 @@  static void __init kvm_use_magic_page(void)
 	on_each_cpu(kvm_map_magic_page, &features, 1);
 
 	/* Quick self-test to see if the mapping works */
-	if (fault_in_pages_readable((const char *)KVM_MAGIC_PAGE, sizeof(u32))) {
+	if (fault_in_readable((const char __user *)KVM_MAGIC_PAGE,
+			      sizeof(u32))) {
 		kvm_patching_worked = false;
 		return;
 	}
diff --git a/arch/powerpc/kernel/signal_32.c b/arch/powerpc/kernel/signal_32.c
index f2da879264bc..3e053e2fd6b6 100644
--- a/arch/powerpc/kernel/signal_32.c
+++ b/arch/powerpc/kernel/signal_32.c
@@ -1048,7 +1048,7 @@  SYSCALL_DEFINE3(swapcontext, struct ucontext __user *, old_ctx,
 	if (new_ctx == NULL)
 		return 0;
 	if (!access_ok(new_ctx, ctx_size) ||
-	    fault_in_pages_readable((u8 __user *)new_ctx, ctx_size))
+	    fault_in_readable((char __user *)new_ctx, ctx_size))
 		return -EFAULT;
 
 	/*
@@ -1239,7 +1239,7 @@  SYSCALL_DEFINE3(debug_setcontext, struct ucontext __user *, ctx,
 #endif
 
 	if (!access_ok(ctx, sizeof(*ctx)) ||
-	    fault_in_pages_readable((u8 __user *)ctx, sizeof(*ctx)))
+	    fault_in_readable((char __user *)ctx, sizeof(*ctx)))
 		return -EFAULT;
 
 	/*
diff --git a/arch/powerpc/kernel/signal_64.c b/arch/powerpc/kernel/signal_64.c
index bb9c077ac132..d1e1fc0acbea 100644
--- a/arch/powerpc/kernel/signal_64.c
+++ b/arch/powerpc/kernel/signal_64.c
@@ -688,7 +688,7 @@  SYSCALL_DEFINE3(swapcontext, struct ucontext __user *, old_ctx,
 	if (new_ctx == NULL)
 		return 0;
 	if (!access_ok(new_ctx, ctx_size) ||
-	    fault_in_pages_readable((u8 __user *)new_ctx, ctx_size))
+	    fault_in_readable((char __user *)new_ctx, ctx_size))
 		return -EFAULT;
 
 	/*
diff --git a/arch/x86/kernel/fpu/signal.c b/arch/x86/kernel/fpu/signal.c
index 831b25c5e705..7f71bd4dcd0d 100644
--- a/arch/x86/kernel/fpu/signal.c
+++ b/arch/x86/kernel/fpu/signal.c
@@ -205,7 +205,7 @@  int copy_fpstate_to_sigframe(void __user *buf, void __user *buf_fx, int size)
 	fpregs_unlock();
 
 	if (ret) {
-		if (!fault_in_pages_writeable(buf_fx, fpu_user_xstate_size))
+		if (!fault_in_writeable(buf_fx, fpu_user_xstate_size))
 			goto retry;
 		return -EFAULT;
 	}
@@ -278,10 +278,9 @@  static int restore_fpregs_from_user(void __user *buf, u64 xrestore,
 		if (ret != -EFAULT)
 			return -EINVAL;
 
-		ret = fault_in_pages_readable(buf, size);
-		if (!ret)
+		if (!fault_in_readable(buf, size))
 			goto retry;
-		return ret;
+		return -EFAULT;
 	}
 
 	/*
diff --git a/drivers/gpu/drm/armada/armada_gem.c b/drivers/gpu/drm/armada/armada_gem.c
index 21909642ee4c..8fbb25913327 100644
--- a/drivers/gpu/drm/armada/armada_gem.c
+++ b/drivers/gpu/drm/armada/armada_gem.c
@@ -336,7 +336,7 @@  int armada_gem_pwrite_ioctl(struct drm_device *dev, void *data,
 	struct drm_armada_gem_pwrite *args = data;
 	struct armada_gem_object *dobj;
 	char __user *ptr;
-	int ret;
+	int ret = 0;
 
 	DRM_DEBUG_DRIVER("handle %u off %u size %u ptr 0x%llx\n",
 		args->handle, args->offset, args->size, args->ptr);
@@ -349,9 +349,8 @@  int armada_gem_pwrite_ioctl(struct drm_device *dev, void *data,
 	if (!access_ok(ptr, args->size))
 		return -EFAULT;
 
-	ret = fault_in_pages_readable(ptr, args->size);
-	if (ret)
-		return ret;
+	if (fault_in_readable(ptr, args->size))
+		return -EFAULT;
 
 	dobj = armada_gem_object_lookup(file, args->handle);
 	if (dobj == NULL)
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 6a863b3f6de0..bf53af8694f8 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -2258,9 +2258,8 @@  static noinline int search_ioctl(struct inode *inode,
 	key.offset = sk->min_offset;
 
 	while (1) {
-		ret = fault_in_pages_writeable(ubuf + sk_offset,
-					       *buf_size - sk_offset);
-		if (ret)
+		ret = -EFAULT;
+		if (fault_in_writeable(ubuf + sk_offset, *buf_size - sk_offset))
 			break;
 
 		ret = btrfs_search_forward(root, &key, path, sk->min_transid);
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 62db6b0176b9..9fe94f7a4f7e 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -733,61 +733,10 @@  int wait_on_page_private_2_killable(struct page *page);
 extern void add_page_wait_queue(struct page *page, wait_queue_entry_t *waiter);
 
 /*
- * Fault everything in given userspace address range in.
+ * Fault in userspace address range.
  */
-static inline int fault_in_pages_writeable(char __user *uaddr, size_t size)
-{
-	char __user *end = uaddr + size - 1;
-
-	if (unlikely(size == 0))
-		return 0;
-
-	if (unlikely(uaddr > end))
-		return -EFAULT;
-	/*
-	 * Writing zeroes into userspace here is OK, because we know that if
-	 * the zero gets there, we'll be overwriting it.
-	 */
-	do {
-		if (unlikely(__put_user(0, uaddr) != 0))
-			return -EFAULT;
-		uaddr += PAGE_SIZE;
-	} while (uaddr <= end);
-
-	/* Check whether the range spilled into the next page. */
-	if (((unsigned long)uaddr & PAGE_MASK) ==
-			((unsigned long)end & PAGE_MASK))
-		return __put_user(0, end);
-
-	return 0;
-}
-
-static inline int fault_in_pages_readable(const char __user *uaddr, size_t size)
-{
-	volatile char c;
-	const char __user *end = uaddr + size - 1;
-
-	if (unlikely(size == 0))
-		return 0;
-
-	if (unlikely(uaddr > end))
-		return -EFAULT;
-
-	do {
-		if (unlikely(__get_user(c, uaddr) != 0))
-			return -EFAULT;
-		uaddr += PAGE_SIZE;
-	} while (uaddr <= end);
-
-	/* Check whether the range spilled into the next page. */
-	if (((unsigned long)uaddr & PAGE_MASK) ==
-			((unsigned long)end & PAGE_MASK)) {
-		return __get_user(c, end);
-	}
-
-	(void)c;
-	return 0;
-}
+size_t fault_in_writeable(char __user *uaddr, size_t size);
+size_t fault_in_readable(const char __user *uaddr, size_t size);
 
 int add_to_page_cache_locked(struct page *page, struct address_space *mapping,
 				pgoff_t index, gfp_t gfp_mask);
diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index c5b2f0f4b8a8..2e07a4b083ed 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -191,7 +191,7 @@  static size_t copy_page_to_iter_iovec(struct page *page, size_t offset, size_t b
 	buf = iov->iov_base + skip;
 	copy = min(bytes, iov->iov_len - skip);
 
-	if (IS_ENABLED(CONFIG_HIGHMEM) && !fault_in_pages_writeable(buf, copy)) {
+	if (IS_ENABLED(CONFIG_HIGHMEM) && !fault_in_writeable(buf, copy)) {
 		kaddr = kmap_atomic(page);
 		from = kaddr + offset;
 
@@ -275,7 +275,7 @@  static size_t copy_page_from_iter_iovec(struct page *page, size_t offset, size_t
 	buf = iov->iov_base + skip;
 	copy = min(bytes, iov->iov_len - skip);
 
-	if (IS_ENABLED(CONFIG_HIGHMEM) && !fault_in_pages_readable(buf, copy)) {
+	if (IS_ENABLED(CONFIG_HIGHMEM) && !fault_in_readable(buf, copy)) {
 		kaddr = kmap_atomic(page);
 		to = kaddr + offset;
 
@@ -447,13 +447,11 @@  int iov_iter_fault_in_readable(const struct iov_iter *i, size_t bytes)
 			bytes = i->count;
 		for (p = i->iov, skip = i->iov_offset; bytes; p++, skip = 0) {
 			size_t len = min(bytes, p->iov_len - skip);
-			int err;
 
 			if (unlikely(!len))
 				continue;
-			err = fault_in_pages_readable(p->iov_base + skip, len);
-			if (unlikely(err))
-				return err;
+			if (fault_in_readable(p->iov_base + skip, len))
+				return -EFAULT;
 			bytes -= len;
 		}
 	}
diff --git a/mm/filemap.c b/mm/filemap.c
index 1293c3409e42..d697b3446a4a 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -90,7 +90,7 @@ 
  *      ->lock_page		(filemap_fault, access_process_vm)
  *
  *  ->i_rwsem			(generic_perform_write)
- *    ->mmap_lock		(fault_in_pages_readable->do_page_fault)
+ *    ->mmap_lock		(fault_in_readable->do_page_fault)
  *
  *  bdi->wb.list_lock
  *    sb_lock			(fs/fs-writeback.c)
diff --git a/mm/gup.c b/mm/gup.c
index 52f08e3177e9..e063cb2bb187 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -1681,6 +1681,78 @@  static long __get_user_pages_locked(struct mm_struct *mm, unsigned long start,
 }
 #endif /* !CONFIG_MMU */
 
+/**
+ * fault_in_writeable - fault in userspace address range for writing
+ * @uaddr: start of address range
+ * @size: size of address range
+ *
+ * Returns the number of bytes not faulted in (like copy_to_user() and
+ * copy_from_user()).
+ */
+size_t fault_in_writeable(char __user *uaddr, size_t size)
+{
+	char __user *start = uaddr, *end;
+
+	if (unlikely(size == 0))
+		return 0;
+	if (!PAGE_ALIGNED(uaddr)) {
+		if (unlikely(__put_user(0, uaddr) != 0))
+			return size;
+		uaddr = (char __user *)PAGE_ALIGN((unsigned long)uaddr);
+	}
+	end = (char __user *)PAGE_ALIGN((unsigned long)start + size);
+	if (unlikely(end < start))
+		end = NULL;
+	while (uaddr != end) {
+		if (unlikely(__put_user(0, uaddr) != 0))
+			goto out;
+		uaddr += PAGE_SIZE;
+	}
+
+out:
+	if (size > uaddr - start)
+		return size - (uaddr - start);
+	return 0;
+}
+EXPORT_SYMBOL(fault_in_writeable);
+
+/**
+ * fault_in_readable - fault in userspace address range for reading
+ * @uaddr: start of user address range
+ * @size: size of user address range
+ *
+ * Returns the number of bytes not faulted in (like copy_to_user() and
+ * copy_from_user()).
+ */
+size_t fault_in_readable(const char __user *uaddr, size_t size)
+{
+	const char __user *start = uaddr, *end;
+	volatile char c;
+
+	if (unlikely(size == 0))
+		return 0;
+	if (!PAGE_ALIGNED(uaddr)) {
+		if (unlikely(__get_user(c, uaddr) != 0))
+			return size;
+		uaddr = (const char __user *)PAGE_ALIGN((unsigned long)uaddr);
+	}
+	end = (const char __user *)PAGE_ALIGN((unsigned long)start + size);
+	if (unlikely(end < start))
+		end = NULL;
+	while (uaddr != end) {
+		if (unlikely(__get_user(c, uaddr) != 0))
+			goto out;
+		uaddr += PAGE_SIZE;
+	}
+
+out:
+	(void)c;
+	if (size > uaddr - start)
+		return size - (uaddr - start);
+	return 0;
+}
+EXPORT_SYMBOL(fault_in_readable);
+
 /**
  * get_dump_page() - pin user page in memory while writing it to core dump
  * @addr: user address