mm/memory.c: actually remap enough memory

For whatever reason, generic_access_phys() only remaps one page, but
actually allows to access arbitrary size.  It's quite easy to trigger
large reads, like printing out large structure with gdb, which leads to a
crash.  Fix it by remapping correct size.

Fixes: 28b2ee20c7cb ("access_process_vm device memory infrastructure")
Signed-off-by: Grazvydas Ignotas <notasas@gmail.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/mm/memory.c b/mm/memory.c
index f7886ab036e7..99275325f303 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3462,7 +3462,7 @@ int generic_access_phys(struct vm_area_struct *vma, unsigned long addr,
         if (follow_phys(vma, addr, write, &prot, &phys_addr))
                 return -EINVAL;
 
-        maddr = ioremap_prot(phys_addr, PAGE_SIZE, prot);
+        maddr = ioremap_prot(phys_addr, PAGE_ALIGN(len + offset), prot);
         if (write)
                 memcpy_toio(maddr + offset, buf, len);
         else