linux-kernel - Re: [PATCH] soc: qcom: mdt_loader: Deal with zero e

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Message-ID: <00dc25ef-923f-499f-91ce-1d2463c48b35@linaro.org>
Date: Mon, 11 Aug 2025 11:23:38 +0200
From: Neil Armstrong <neil.armstrong@...aro.org>
To: Bjorn Andersson <bjorn.andersson@....qualcomm.com>,
 Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konradybcio@...nel.org>,
 Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Cc: linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
 Val Packett <val@...kett.cool>
Subject: Re: [PATCH] soc: qcom: mdt_loader: Deal with zero e_shentsize

On 30/07/2025 22:51, Bjorn Andersson wrote:
> Firmware that doesn't provide section headers leave both e_shentsize and
> e_shnum 0, which obvious isn't compatible with the newly introduced
> stricter checks.
> 
> Make the section-related checks conditional on either of these values
> being non-zero.
> 
> Fixes: 9f9967fed9d0 ("soc: qcom: mdt_loader: Ensure we don't read past the ELF header")
> Reported-by: Val Packett <val@...kett.cool>
> Closes: https://lore.kernel.org/all/ece307c3-7d65-440f-babd-88cf9705b908@packett.cool/
> Reported-by: Neil Armstrong <neil.armstrong@...aro.org>
> Closes: https://lore.kernel.org/all/aec9cd03-6fc2-4dc8-b937-8b7cf7bf4128@linaro.org/
> Signed-off-by: Bjorn Andersson <bjorn.andersson@....qualcomm.com>
> ---
>   drivers/soc/qcom/mdt_loader.c | 12 +++++++-----
>   1 file changed, 7 insertions(+), 5 deletions(-)
> 

The issue solved by this fix is still present on v6.17-rc1, even if we reported
a breakage over -next on the 22th of July.

Neil