diff options
Diffstat (limited to 'mm/usercopy.c')
| -rw-r--r-- | mm/usercopy.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/mm/usercopy.c b/mm/usercopy.c index ff13e7708faa..e1e856dca124 100644 --- a/mm/usercopy.c +++ b/mm/usercopy.c @@ -17,6 +17,7 @@ #include <linux/sched/task.h> #include <linux/sched/task_stack.h> #include <linux/thread_info.h> +#include <linux/vmalloc.h> #include <linux/atomic.h> #include <linux/jump_label.h> #include <asm/sections.h> @@ -238,6 +239,21 @@ static inline void check_heap_object(const void *ptr, unsigned long n, return; } + if (is_vmalloc_addr(ptr)) { + struct vm_struct *area = find_vm_area(ptr); + unsigned long offset; + + if (!area) { + usercopy_abort("vmalloc", "no area", to_user, 0, n); + return; + } + + offset = ptr - area->addr; + if (offset + n > get_vm_area_size(area)) + usercopy_abort("vmalloc", NULL, to_user, offset, n); + return; + } + folio = virt_to_folio(ptr); if (folio_test_slab(folio)) { |