kasan: enable instrumentation of global variables

[cascardo/linux.git] / mm / kasan / report.c

diff --git a/mm/kasan/report.c b/mm/kasan/report.c
index 866732e..680ceed 100644 (file)
--- a/mm/kasan/report.c
+++ b/mm/kasan/report.c
@@ -23,6 +23,8 @@
 #include <linux/types.h>
 #include <linux/kasan.h>
 
+#include <asm/sections.h>
+
 #include "kasan.h"
 #include "../slab.h"
 
@@ -61,6 +63,7 @@ static void print_error_description(struct kasan_access_info *info)
                break;
        case KASAN_PAGE_REDZONE:
        case KASAN_KMALLOC_REDZONE:
+       case KASAN_GLOBAL_REDZONE:
        case 0 ... KASAN_SHADOW_SCALE_SIZE - 1:
                bug_type = "out of bounds access";
                break;
@@ -80,6 +83,20 @@ static void print_error_description(struct kasan_access_info *info)
                info->access_size, current->comm, task_pid_nr(current));
 }
 
+static inline bool kernel_or_module_addr(const void *addr)
+{
+       return (addr >= (void *)_stext && addr < (void *)_end)
+               || (addr >= (void *)MODULES_VADDR
+                       && addr < (void *)MODULES_END);
+}
+
+static inline bool init_task_stack_addr(const void *addr)
+{
+       return addr >= (void *)&init_thread_union.stack &&
+               (addr <= (void *)&init_thread_union.stack +
+                       sizeof(init_thread_union.stack));
+}
+
 static void print_address_description(struct kasan_access_info *info)
 {
        const void *addr = info->access_addr;
@@ -107,6 +124,11 @@ static void print_address_description(struct kasan_access_info *info)
                dump_page(page, "kasan: bad access detected");
        }
 
+       if (kernel_or_module_addr(addr)) {
+               if (!init_task_stack_addr(addr))
+                       pr_err("Address belongs to variable %pS\n", addr);
+       }
+
        dump_stack();
 }