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Subject[PATCH] usercopy: no check page span for stack objects
Date
It is easy to trigger this with CONFIG_HARDENED_USERCOPY_PAGESPAN=y,

usercopy: Kernel memory overwrite attempt detected to spans multiple
pages (offset 0, size 23)!
kernel BUG at mm/usercopy.c:102!

For example,

print_worker_info
char name[WQ_NAME_LEN] = { };
char desc[WORKER_DESC_LEN] = { };
probe_kernel_read(name, wq->name, sizeof(name) - 1);
probe_kernel_read(desc, worker->desc, sizeof(desc) - 1);
__copy_from_user_inatomic
check_object_size
check_heap_object
check_page_span

This is because on-stack variables could cross PAGE_SIZE boundary, and
failed this check,

if (likely(((unsigned long)ptr & (unsigned long)PAGE_MASK) ==
((unsigned long)end & (unsigned long)PAGE_MASK)))

ptr = FFFF889007D7EFF8
end = FFFF889007D7F00E

Hence, fix it by checking if it is a stack object first.

Signed-off-by: Qian Cai <cai@lca.pw>
---
mm/usercopy.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/mm/usercopy.c b/mm/usercopy.c
index 852eb4e53f06..a1f58beaa246 100644
--- a/mm/usercopy.c
+++ b/mm/usercopy.c
@@ -262,9 +262,6 @@ void __check_object_size(const void *ptr, unsigned long n, bool to_user)
/* Check for invalid addresses. */
check_bogus_address((const unsigned long)ptr, n, to_user);

- /* Check for bad heap object. */
- check_heap_object(ptr, n, to_user);
-
/* Check for bad stack object. */
switch (check_stack_object(ptr, n)) {
case NOT_STACK:
@@ -282,6 +279,9 @@ void __check_object_size(const void *ptr, unsigned long n, bool to_user)
usercopy_abort("process stack", NULL, to_user, 0, n);
}

+ /* Check for bad heap object. */
+ check_heap_object(ptr, n, to_user);
+
/* Check for object in kernel to avoid text exposure. */
check_kernel_text_object((const unsigned long)ptr, n, to_user);
}
--
2.17.2 (Apple Git-113)
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