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Date: Sun, 16 Oct 2016 00:53:33 +0200
From: Colin Vidal <colin@...dal.org>
To: kernel-hardening@...ts.openwall.com, "Reshetova, Elena"
<elena.reshetova@...el.com>, David Windsor <dwindsor@...il.com>, AKASHI
Takahiro <takahiro.akashi@...aro.org>, Hans Liljestrand
<ishkamiel@...il.com>
Subject: Re: include/asm-generic/atomic-long.h:
Reordering atomic_*_wrap macros
On Fri, 2016-10-14 at 21:10 +0200, Colin Vidal wrote:
> Hi Elena,
>
> I don't know if it may helps for the v2, but here is the (tiny)
> modifications I have done on a generic part to be able to build on ARM
> without CONFIG_HARDENING_ATOMIC (of course, there is also some
> modifications in arch/arm, but it is not the subject, and it only a
> prototype for now). It does not break x86 builds.
>
> It basically a reordering / guard on macros atomic_*_wrap in order to
> avoid implicitly defined / redefined error about them, when
> CONFIG_HARDENED_ATOMIC is unset.
>
> Thanks,
>
> Colin
>
> ---
> include/asm-generic/atomic-long.h | 43 ++++++++++++++++-----------------------
> 1 file changed, 18 insertions(+), 25 deletions(-)
>
> diff --git a/include/asm-generic/atomic-long.h b/include/asm-generic/atomic-long.h
> index 790cb00..6f1dc3e 100644
> --- a/include/asm-generic/atomic-long.h
> +++ b/include/asm-generic/atomic-long.h
> @@ -46,6 +46,22 @@ typedef atomic_t atomic_long_wrap_t;
>
> #endif
>
> +#ifndef CONFIG_HARDENED_ATOMIC
> +#define atomic_read_wrap(v) atomic_read(v)
> +#define atomic_set_wrap(v, i) atomic_set((v), (i))
> +#define atomic_add_wrap(i, v) atomic_add((i), (v))
> +#define atomic_add_unless_wrap(v, i, j) atomic_add_unless((v), (i), (j))
> +#define atomic_sub_wrap(i, v) atomic_sub((i), (v))
> +#define atomic_inc_wrap(v) atomic_inc(v)
> +#define atomic_inc_and_test_wrap(v) atomic_inc_and_test(v)
> +#define atomic_inc_return_wrap(v) atomic_inc_return(v)
> +#define atomic_add_return_wrap(i, v) atomic_add_return((i), (v))
> +#define atomic_dec_wrap(v) atomic_dec(v)
> +#define atomic_cmpxchg_wrap(v, o, n) atomic_cmpxchg((v), (o), (n))
> +#define atomic_xchg_wrap(v, i) atomic_xchg((v), (i))
> +#define atomic_long_sub_and_test_wrap(i, v) atomic_long_sub_and_test(i, v)
> +#endif /* CONFIG_HARDENED_ATOMIC */
> +
> #define ATOMIC_LONG_READ_OP(mo, suffix) \
> static inline long atomic_long_read##mo##suffix(const atomic_long##suffix##_t *l)\
> { \
> @@ -233,12 +249,14 @@ static inline int atomic_long_sub_and_test(long i, atomic_long_t *l)
> return ATOMIC_LONG_PFX(_sub_and_test)(i, v);
> }
>
> +#ifdef CONFIG_HARDENED_ATOMIC
> static inline int atomic_long_sub_and_test_wrap(long i, atomic_long_wrap_t *l)
> {
> ATOMIC_LONG_PFX(_wrap_t) *v = (ATOMIC_LONG_PFX(_wrap_t) *)l;
>
> return ATOMIC_LONG_PFX(_sub_and_test_wrap)(i, v);
> }
> +#endif
>
> static inline int atomic_long_dec_and_test(atomic_long_t *l)
> {
> @@ -291,29 +309,4 @@ static inline long atomic_long_add_unless(atomic_long_t *l, long a, long u)
> #define atomic_long_inc_not_zero(l) \
> ATOMIC_LONG_PFX(_inc_not_zero)((ATOMIC_LONG_PFX(_t) *)(l))
>
> -#ifndef CONFIG_HARDENED_ATOMIC
> -#define atomic_read_wrap(v) atomic_read(v)
> -#define atomic_set_wrap(v, i) atomic_set((v), (i))
> -#define atomic_add_wrap(i, v) atomic_add((i), (v))
> -#define atomic_add_unless_wrap(v, i, j) atomic_add_unless((v), (i), (j))
> -#define atomic_sub_wrap(i, v) atomic_sub((i), (v))
> -#define atomic_inc_wrap(v) atomic_inc(v)
> -#define atomic_inc_and_test_wrap(v) atomic_inc_and_test(v)
> -#define atomic_inc_return_wrap(v) atomic_inc_return(v)
> -#define atomic_add_return_wrap(i, v) atomic_add_return((i), (v))
> -#define atomic_dec_wrap(v) atomic_dec(v)
> -#define atomic_cmpxchg_wrap(v, o, n) atomic_cmpxchg((v), (o), (n))
> -#define atomic_xchg_wrap(v, i) atomic_xchg((v), (i))
> -#define atomic_long_read_wrap(v) atomic_long_read(v)
> -#define atomic_long_set_wrap(v, i) atomic_long_set((v), (i))
> -#define atomic_long_add_wrap(i, v) atomic_long_add((i), (v))
> -#define atomic_long_sub_wrap(i, v) atomic_long_sub((i), (v))
> -#define atomic_long_inc_wrap(v) atomic_long_inc(v)
> -#define atomic_long_add_return_wrap(i, v) atomic_long_add_return((i), (v))
> -#define atomic_long_inc_return_wrap(v) atomic_long_inc_return(v)
> -#define atomic_long_sub_and_test_wrap(i, v) atomic_long_sub_and_test((i), (v))
> -#define atomic_long_dec_wrap(v) atomic_long_dec(v)
> -#define atomic_long_xchg_wrap(v, i) atomic_long_xchg((v), (i))
> -#endif /* CONFIG_HARDENED_ATOMIC */
> -
> #endif /* _ASM_GENERIC_ATOMIC_LONG_H */
Argh. I actually had to make some modifications on it today... I will
resend a new version with a RFC of the arm port as soon as I finish it.
Colin
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