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powerpc: don't use direct assignation during early boot.

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In kernel/cputable.c, explicitly use memcpy() instead of *y = *x;
This will allow GCC to replace it with __memcpy() when KASAN is
selected.

Acked-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Christophe Leroy
2019-04-26 16:23:29 +00:00
committed by Michael Ellerman
parent 450e7dd400
commit adcf59187e
2 changed files with 18 additions and 5 deletions
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13
arch/powerpc/kernel/cputable.c
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@@ -2147,7 +2147,11 @@ void __init set_cur_cpu_spec(struct cpu_spec *s)
struct cpu_spec *t = &the_cpu_spec;
t = PTRRELOC(t);
*t = *s;
/*
* use memcpy() instead of *t = *s so that GCC replaces it
* by __memcpy() when KASAN is active
*/
memcpy(t, s, sizeof(*t));
*PTRRELOC(&cur_cpu_spec) = &the_cpu_spec;
}
@@ -2161,8 +2165,11 @@ static struct cpu_spec * __init setup_cpu_spec(unsigned long offset,
t = PTRRELOC(t);
old = *t;
/* Copy everything, then do fixups */
*t = *s;
/*
* Copy everything, then do fixups. Use memcpy() instead of *t = *s
* so that GCC replaces it by __memcpy() when KASAN is active
*/
memcpy(t, s, sizeof(*t));
/*
* If we are overriding a previous value derived from the real