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Diffstat (limited to 'mm/maccess.c')
-rw-r--r--mm/maccess.c16
1 files changed, 9 insertions, 7 deletions
diff --git a/mm/maccess.c b/mm/maccess.c
index db7cf48d8fed..88845eda5047 100644
--- a/mm/maccess.c
+++ b/mm/maccess.c
@@ -24,7 +24,7 @@ bool __weak probe_kernel_read_allowed(const void *unsafe_src, size_t size)
long probe_kernel_read(void *dst, const void *src, size_t size)
{
if (!probe_kernel_read_allowed(src, size))
- return -EFAULT;
+ return -ERANGE;
pagefault_disable();
probe_kernel_read_loop(dst, src, size, u64, Efault);
@@ -68,7 +68,7 @@ long strncpy_from_kernel_nofault(char *dst, const void *unsafe_addr, long count)
if (unlikely(count <= 0))
return 0;
if (!probe_kernel_read_allowed(unsafe_addr, count))
- return -EFAULT;
+ return -ERANGE;
pagefault_disable();
do {
@@ -93,7 +93,8 @@ Efault:
* @size: size of the data chunk
*
* Safely read from kernel address @src to the buffer at @dst. If a kernel
- * fault happens, handle that and return -EFAULT.
+ * fault happens, handle that and return -EFAULT. If @src is not a valid kernel
+ * address, return -ERANGE.
*
* We ensure that the copy_from_user is executed in atomic context so that
* do_page_fault() doesn't attempt to take mmap_lock. This makes
@@ -106,7 +107,7 @@ long probe_kernel_read(void *dst, const void *src, size_t size)
mm_segment_t old_fs = get_fs();
if (!probe_kernel_read_allowed(src, size))
- return -EFAULT;
+ return -ERANGE;
set_fs(KERNEL_DS);
pagefault_disable();
@@ -158,8 +159,9 @@ long probe_kernel_write(void *dst, const void *src, size_t size)
*
* On success, returns the length of the string INCLUDING the trailing NUL.
*
- * If access fails, returns -EFAULT (some data may have been copied
- * and the trailing NUL added).
+ * If access fails, returns -EFAULT (some data may have been copied and the
+ * trailing NUL added). If @unsafe_addr is not a valid kernel address, return
+ * -ERANGE.
*
* If @count is smaller than the length of the string, copies @count-1 bytes,
* sets the last byte of @dst buffer to NUL and returns @count.
@@ -173,7 +175,7 @@ long strncpy_from_kernel_nofault(char *dst, const void *unsafe_addr, long count)
if (unlikely(count <= 0))
return 0;
if (!probe_kernel_read_allowed(unsafe_addr, count))
- return -EFAULT;
+ return -ERANGE;
set_fs(KERNEL_DS);
pagefault_disable();