Messages in this thread | | | From | Kees Cook <> | Date | Wed, 13 Mar 2019 19:53:09 -0700 | Subject | Re: lib/test_overflow.c causes WARNING and tainted kernel |
| |
Hi!
On Wed, Mar 13, 2019 at 2:29 PM Randy Dunlap <rdunlap@infradead.org> wrote: > > This is v5.0-11053-gebc551f2b8f9, MAR-12 around 4:00pm PT. > > In the first test_kmalloc() in test_overflow_allocation(): > > [54375.073895] test_overflow: ok: (s64)(0 << 63) == 0 > [54375.074228] WARNING: CPU: 2 PID: 5462 at ../mm/page_alloc.c:4584 __alloc_pages_nodemask+0x33f/0x540 > [...] > [54375.079236] ---[ end trace 754acb68d8d1a1cb ]--- > [54375.079313] test_overflow: kmalloc detected saturation
Yup! This is expected and operating as intended: it is exercising the allocator's detection of insane allocation sizes. :)
If we want to make it less noisy, perhaps we could add a global flag the allocators could check before doing their WARNs?
-Kees
-- Kees Cook
| |