linux-kernel - Re: [PATCH] thermal/netlink: Prevent Userspace Segmentation Fault by Adjusting UAPI Header

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Message-ID: <15de0ea2-eae6-4f23-9ca1-15836ec95cca@linaro.org>
Date: Tue, 11 Feb 2025 09:01:53 +0100
From: Daniel Lezcano <daniel.lezcano@...aro.org>
To: Zhang Rui <rui.zhang@...el.com>, rafael.j.wysocki@...el.com
Cc: linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
 lukasz.luba@....com, srinivas.pandruvada@...el.com
Subject: Re: [PATCH] thermal/netlink: Prevent Userspace Segmentation Fault by
 Adjusting UAPI Header

On 08/02/2025 08:49, Zhang Rui wrote:
> The intel-lpmd tool [1], which uses the THERMAL_GENL_ATTR_CPU_CAPABILITY
> attribute to receive HFI events from kernel space, encounters a
> segmentation fault after commit 1773572863c4 ("thermal: netlink: Add the
> commands and the events for the thresholds").
> 
> The issue arises because the THERMAL_GENL_ATTR_CPU_CAPABILITY raw value
> was changed while intel_lpmd still uses the old value.
> 
> Although intel_lpmd can be updated to check the THERMAL_GENL_VERSION and
> use the appropriate THERMAL_GENL_ATTR_CPU_CAPABILITY value, the commit
> itself is questionable. The commit introduced a new element in the
> middle of enum thermal_genl_attr, which affects many existing attributes
> and introduces potential risks and unnecessary maintenance burdens for
> userspace thermal netlink event users.
> 
> Solve the issue by moving the newly introduced
> THERMAL_GENL_ATTR_TZ_PREV_TEMP attribute to the end of the
> enum thermal_genl_attr. This ensures that all existing thermal generic
> netlink attributes remain unaffected.
> 
> Link: https://github.com/intel/intel-lpmd [1]
> Fixes: 1773572863c4 ("thermal: netlink: Add the commands and the events for the thresholds")
> Signed-off-by: Zhang Rui <rui.zhang@...el.com>
> ---

Right, thanks for the fix

Reviewed-by: Daniel Lezcano <daniel.lezcano@...aro.org>


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