<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <style type="text/css" style="display:none;"> P {margin-top:0;margin-bottom:0;} </style> </head> <body dir="ltr"> <div style="font-family: "IntelOne Text"; font-size: 10pt; color: rgb(0, 0, 0);" class="elementToProof"> What needed to get it merged within RC1 window ? </div> <div id="appendonsend"></div> <div> </div> <div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> </div> <hr style="display: inline-block; width: 98%;"> <div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> From: Morten Brørup <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.ananyev@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_timingsafe() based on FreeBSD API </div> <div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> </div> <div style="font-size: 11pt;" class="elementToProof">> From: Kai Ji [<a class="OWAAutoLink" id="OWAbfe2d5fa-ad9e-6741-9051-c245f7672a14" href="mailto:kai.ji@intel.com">mailto:kai.ji@intel.com</a>] > Sent: Thursday, 2 October 2025 17.32 > > Bugzilla ID: 1773 > <a data-auth="NotApplicable" class="OWAAutoLink" id="OWA022adc35-d234-0bf2-3791-e24a374476c1" href="https://bugs.dpdk.org/show_bug.cgi?id=1773"> https://bugs.dpdk.org/show_bug.cgi?id=1773</a> > > 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 > 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 = (const volatile uint8_t *)a; > + const volatile uint8_t *pb = (const volatile uint8_t *)b; > + uint8_t result = 0; > + size_t i; > + > + for (i = 0; i < n; i++) > + result |= pa[i] ^ pb[i]; > + > + return result == UINT8_C(0); > +} > + > #ifdef __cplusplus > } > #endif > -- > 2.34.1 Reviewed-by: Morten Brørup <mb@smartsharesystems.com> </div> </body> </html>