ACK: [SRU][J:linux-bluefield][PATCH v2 0/1] UBUNTU: SAUCE: gpio-mlxbf3: support valid mask

[Tim Gardner]

On 10/10/23 11:05 AM, Asmaa Mnebhi wrote:
> BugLink: https://bugs.launchpad.net/bugs/2038868
> 
> SRU Justification:
> 
> [Impact]
> 
> After syncing up the gpio-mlxbf3.c driver with the upstreamed version,
> we dropped the use of the valid_mask variable because kernels greater
> or equal to 6.2.0 dont need it.
> This is no longer needed in kernel versions >= 6.2.0 because valid_mask
> is populated by core gpio code.
> 5.15 kernel doesnt support that feature so we still need to explicitly
> define valid_mask like we did before.
> This doesnt impact the functionality of the GPIO driver but it is a
> security breach as it doesnt restrict the access to only gpios defined
> in the acpi table by valid_mask.
> 
> [Fix]
> 
> * define valid_mask and init_valid_mask
> 
> [Test Case]
> 
> * Make sure that the user (libgpiod) cannot access any other gpio besides
>    0->4 (gpiochip0) and 22-23 in gpiochip1.
> 
> [Regression Potential]
> 
> no known regression.
> 
Acked-by: Tim Gardner <tim.gardner at canonical.com>
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Tim Gardner
Canonical, Inc