linux-hardening - [PATCH v3 2/3] mm/usercopy: Detect vmalloc overruns

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Date:   Mon, 13 Dec 2021 14:27:02 +0000
From:   "Matthew Wilcox (Oracle)" <willy@...radead.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        linux-mm@...ck.org, Thomas Gleixner <tglx@...utronix.de>,
        linux-hardening@...r.kernel.org
Subject: [PATCH v3 2/3] mm/usercopy: Detect vmalloc overruns

If you have a vmalloc() allocation, or an address from calling vmap(),
you cannot overrun the vm_area which describes it, regardless of the
size of the underlying allocation.  This probably doesn't do much for
security because vmalloc comes with guard pages these days, but it
prevents usercopy aborts when copying to a vmap() of smaller pages.

Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
Acked-by: Kees Cook <keescook@...omium.org>
---
 mm/usercopy.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/mm/usercopy.c b/mm/usercopy.c
index 8c039302465f..63476e1506e0 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>
@@ -237,6 +238,21 @@ static inline void check_heap_object(const void *ptr, unsigned long n,
 		return;
 	}
 
+	if (is_vmalloc_addr(ptr)) {
+		struct vm_struct *vm = find_vm_area(ptr);
+		unsigned long offset;
+
+		if (!vm) {
+			usercopy_abort("vmalloc", "no area", to_user, 0, n);
+			return;
+		}
+
+		offset = ptr - vm->addr;
+		if (offset + n > vm->size)
+			usercopy_abort("vmalloc", NULL, to_user, offset, n);
+		return;
+	}
+
 	page = virt_to_head_page(ptr);
 
 	if (PageSlab(page)) {
-- 
2.33.0