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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable What needed to get it merged within RC1 window ? ________________________________ From: Morten Br=F8rup Sent: Friday, October 03, 2025 08:35 To: Ji, Kai ; dev@dpdk.org Cc: gakhil@marvell.com ; konstantin.ananyev@huawei.com = ; Richardson, Bruce ; thomas@monjalon.net ; stephen@networkplumber.org= Subject: RE: [dpdk-dev v6 1/2] eal: introduce rte_memeq_timingsafe() based = on FreeBSD API > From: Kai Ji [mailto:kai.ji@intel.com] > Sent: Thursday, 2 October 2025 17.32 > > Bugzilla ID: 1773 > https://bugs.dpdk.org/show_bug.cgi?id=3D1773 > > Signed-off-by: Kai Ji > --- > lib/eal/include/rte_memory.h | 38 ++++++++++++++++++++++++++++++++++++ > 1 file changed, 38 insertions(+) > > diff --git a/lib/eal/include/rte_memory.h > b/lib/eal/include/rte_memory.h > index dcc0e69cfe..2d24e091af 100644 > --- a/lib/eal/include/rte_memory.h > +++ b/lib/eal/include/rte_memory.h > @@ -746,6 +746,44 @@ __rte_experimental > void > rte_memzero_explicit(void *dst, size_t sz); > > +/** > + * @warning > + * @b EXPERIMENTAL: this API may change without prior notice. > + * > + * Timing-safe memory equality comparison. > + * > + * This function compares two memory regions in constant time, making > it > + * resistant to timing side-channel attacks. The execution time > depends only > + * on the length parameter, not on the actual data values being > compared. > + * > + * This is particularly important for cryptographic operations where > timing > + * differences could leak information about secret keys, passwords, or > other > + * sensitive data. > + * > + * @param a > + * Pointer to the first memory region to compare > + * @param b > + * Pointer to the second memory region to compare > + * @param n > + * Number of bytes to compare > + * @return > + * true if the memory regions are identical, false if they differ > + */ > +__rte_experimental > +static inline bool > +rte_memeq_timingsafe(const void *a, const void *b, size_t n) > +{ > + const volatile uint8_t *pa =3D (const volatile uint8_t *)a; > + const volatile uint8_t *pb =3D (const volatile uint8_t *)b; > + uint8_t result =3D 0; > + size_t i; > + > + for (i =3D 0; i < n; i++) > + result |=3D pa[i] ^ pb[i]; > + > + return result =3D=3D UINT8_C(0); > +} > + > #ifdef __cplusplus > } > #endif > -- > 2.34.1 Reviewed-by: Morten Br=F8rup --_000_DS0PR11MB74588649DF0B88EA8475EDF281EFADS0PR11MB7458namp_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
What needed to get it merged within RC1 window ? 


From: Morten Br=F8rup <mb@smartsharesystems.com>
Sent: Friday, October 03, 2025 08:35
To: Ji, Kai <kai.ji@intel.com>; dev@dpdk.org <dev@dpdk= .org>
Cc: gakhil@marvell.com <gakhil@marvell.com>; konstantin.a= nanyev@huawei.com <konstantin.ananyev@huawei.com>; Richardson, Bruce = <bruce.richardson@intel.com>; thomas@monjalon.net <thomas@monjalon= .net>; stephen@networkplumber.org <stephen@networkplumber.org>
Subject: RE: [dpdk-dev v6 1/2] eal: introduce rte_memeq_timings= afe() based on FreeBSD API

> From: Kai Ji = [mailto:kai.ji@intel.com]
> Sent: Thursday, 2 October 2025 17.32
>
> Bugzilla ID: 1773
> https://bugs.dpdk.org/show_bug.cgi?id=3D1773
>
> Signed-off-by: Kai Ji <kai.ji@intel.com>
> ---
>  lib/eal/include/rte_memory.h | 38 ++++++++++++++++++++++++++++++= ++++++
>  1 file changed, 38 insertions(+)
>
> diff --git a/lib/eal/include/rte_memory.h
> b/lib/eal/include/rte_memory.h
> index dcc0e69cfe..2d24e091af 100644
> --- a/lib/eal/include/rte_memory.h
> +++ b/lib/eal/include/rte_memory.h
> @@ -746,6 +746,44 @@ __rte_experimental
>  void
>  rte_memzero_explicit(void *dst, size_t sz);
>
> +/**
> + * @warning
> + * @b EXPERIMENTAL: this API may change without prior notice.
> + *
> + * Timing-safe memory equality comparison.
> + *
> + * This function compares two memory regions in constant time, making=
> it
> + * resistant to timing side-channel attacks. The execution time
> depends only
> + * on the length parameter, not on the actual data values being
> compared.
> + *
> + * This is particularly important for cryptographic operations where<= br> > timing
> + * differences could leak information about secret keys, passwords, o= r
> other
> + * sensitive data.
> + *
> + * @param a
> + *   Pointer to the first memory region to compare
> + * @param b
> + *   Pointer to the second memory region to compare
> + * @param n
> + *   Number of bytes to compare
> + * @return
> + *   true if the memory regions are identical, false if the= y differ
> + */
> +__rte_experimental
> +static inline bool
> +rte_memeq_timingsafe(const void *a, const void *b, size_t n)
> +{
> +     const volatile uint8_t *pa =3D (const volati= le uint8_t *)a;
> +     const volatile uint8_t *pb =3D (const volati= le uint8_t *)b;
> +     uint8_t result =3D 0;
> +     size_t i;
> +
> +     for (i =3D 0; i < n; i++)
> +           &nb= sp; result |=3D pa[i] ^ pb[i];
> +
> +     return result =3D=3D UINT8_C(0);
> +}
> +
>  #ifdef __cplusplus
>  }
>  #endif
> --
> 2.34.1

Reviewed-by: Morten Br=F8rup <mb@smartsharesystems.com>

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