Re: [PATCH v2] net/ark: fix unsafe env variable in extension loading

[Stephen Hemminger <stephen@networkplumber.org>]

On Wed,  3 Jun 2026 08:32:45 +0300
Denis Sergeev <denserg.edu@gmail.com> wrote:

> The ARK_EXT_PATH environment variable is passed to dlopen without
> verifying process privileges. In a setuid/setgid scenario, this
> could allow loading an arbitrary shared library with elevated
> privileges.
> 
> Add a check that effective user/group IDs match real IDs before
> trusting the environment variable, consistent with the same
> protection already present in the mlx5 driver.
> 
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
> 
> Fixes: 727b3fe292bc ("net/ark: integrate PMD")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Denis Sergeev <denserg.edu@gmail.com>

Thanks for the report, but it makes no sense.
DPDK already load shared libraries via -d command line arg without
checking. And running DPDK application as setuid would be completely
unsafe. The startup is not hardened in anyway.

NAK

That said, it would be good if DPDK had some security documentation
about what the trust boundary is and what capabilities are needed.