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These changes are the raw update to linux-4.4.6-rt14. Kernel sources
[kvmfornfv.git]
/
kernel
/
drivers
/
misc
/
lkdtm.c
diff --git
a/kernel/drivers/misc/lkdtm.c
b/kernel/drivers/misc/lkdtm.c
index
b5abe34
..
11fdadc
100644
(file)
--- a/
kernel/drivers/misc/lkdtm.c
+++ b/
kernel/drivers/misc/lkdtm.c
@@
-472,7
+472,7
@@
static void lkdtm_do_action(enum ctype which)
break;
}
case CT_ACCESS_USERSPACE: {
break;
}
case CT_ACCESS_USERSPACE: {
- unsigned long user_addr, tmp;
+ unsigned long user_addr, tmp
= 0
;
unsigned long *ptr;
user_addr = vm_mmap(NULL, 0, PAGE_SIZE,
unsigned long *ptr;
user_addr = vm_mmap(NULL, 0, PAGE_SIZE,
@@
-483,6
+483,12
@@
static void lkdtm_do_action(enum ctype which)
return;
}
return;
}
+ if (copy_to_user((void __user *)user_addr, &tmp, sizeof(tmp))) {
+ pr_warn("copy_to_user failed\n");
+ vm_munmap(user_addr, PAGE_SIZE);
+ return;
+ }
+
ptr = (unsigned long *)user_addr;
pr_info("attempting bad read at %p\n", ptr);
ptr = (unsigned long *)user_addr;
pr_info("attempting bad read at %p\n", ptr);