[Bug 204479] KASAN hit at modprobe zram

From: <hidden>
Date: 2019-08-08 14:00:05

https://bugzilla.kernel.org/show_bug.cgi?id=204479

--- Comment #4 from Christophe Leroy (christophe.leroy@c-s.fr) ---

We need to identify if the allocation of KASAN shadow area at module allocation
fails, or if kasan accesses outside of the allocated area.

Could you please run again with the below trace:

diff --git a/arch/powerpc/mm/kasan/kasan_init_32.c

b/arch/powerpc/mm/kasan/kasan_init_32.c
index 74f4555a62ba..2bca2bf691a9 100644

--- a/arch/powerpc/mm/kasan/kasan_init_32.c
+++ b/arch/powerpc/mm/kasan/kasan_init_32.c

@@ -142,6 +142,9 @@ void *module_alloc(unsigned long size)
        if (!base)
                return NULL;

+       pr_err("###### module_alloc(%lx) = %px [%px-%px]\n", size, base,
+              kasan_mem_to_shadow(base), kasan_mem_to_shadow(base + size));
+
        if (!kasan_init_region(base, size))
                return base;

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