[PATCH v2] ethdev: add buffer size parameter to rte_eth_dev_get_name_by_port()

[Stephen Hemminger]

On Thu, 28 May 2026 17:07:48 -0700
Stephen Hemminger <stephen at networkplumber.org> wrote:

> rte_eth_dev_get_name_by_port() uses strcpy() into a caller-provided
> buffer with no bounds checking. A mistaken caller that supplies a
> buffer smaller than RTE_ETH_NAME_MAX_LEN can overflow the buffer.
> 
> Add a size parameter and replace strcpy() with strlcpy(), returning
> -ERANGE if the name is truncated. The copy is now performed under
> the ethdev shared data lock so that the name cannot be mutated by
> another process between reading and copying.
> 
> The previous ABI is preserved via symbol versioning (DPDK_26) with a
> thin wrapper that delegates to the new implementation with
> RTE_ETH_NAME_MAX_LEN. The versioned symbol will be removed in 26.11.
> 
> Update all in-tree callers to pass sizeof(name) as the new parameter.
> 
> Signed-off-by: Stephen Hemminger <stephen at networkplumber.org>
> Reviewed-by: Andrew Rybchenko <andrew.rybchenko at oktetlabs.ru>
> ---

Since function versioning breaks LTO (see Bugzilla).
Holding off on this until 26.11 where versioning not needed.