linux-kernel - Re: [PATCH] remoteproc: elf_loader: Update resource table name check

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Date:   Sat, 10 Dec 2022 11:06:13 +0800
From:   Peng Fan <peng.fan@....nxp.com>
To:     Srinivasa Rao Mandadapu <quic_srivasam@...cinc.com>,
        linux-remoteproc@...r.kernel.org, agross@...nel.org,
        andersson@...nel.org, lgirdwood@...il.com, broonie@...nel.org,
        robh+dt@...nel.org, quic_plai@...cinc.com, bgoswami@...cinc.com,
        perex@...ex.cz, tiwai@...e.com, srinivas.kandagatla@...aro.org,
        quic_rohkumar@...cinc.com, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, swboyd@...omium.org,
        judyhsiao@...omium.org, devicetree@...r.kernel.org,
        krzysztof.kozlowski@...aro.org, mathieu.poirier@...aro.org
Subject: Re: [PATCH] remoteproc: elf_loader: Update resource table name check



On 12/1/2022 8:20 PM, Srinivasa Rao Mandadapu wrote:
> Update resource table name check with sub string search instead of
> complete string search.
> In general Qualcomm binary contains, section header name
> (e.g. .resource_table), amended with extra string to differentiate
> with other sections.
> So far Android adsp binaries are being authenticated using TZ,
> hence this mismatch hasn't created any problem.
> In recent developments, ADSP binary is being used in Chrome based
> platforms, which doesn't have TZ path, hence resource table is
> required for memory sandboxing.
> 
> Signed-off-by: Srinivasa Rao Mandadapu <quic_srivasam@...cinc.com>
> ---
>   drivers/remoteproc/remoteproc_elf_loader.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/remoteproc/remoteproc_elf_loader.c b/drivers/remoteproc/remoteproc_elf_loader.c
> index 5a412d7..0feb120 100644
> --- a/drivers/remoteproc/remoteproc_elf_loader.c
> +++ b/drivers/remoteproc/remoteproc_elf_loader.c
> @@ -272,7 +272,7 @@ find_table(struct device *dev, const struct firmware *fw)
>   		u64 offset = elf_shdr_get_sh_offset(class, shdr);
>   		u32 name = elf_shdr_get_sh_name(class, shdr);
>   
> -		if (strcmp(name_table + name, ".resource_table"))
> +		if (!strstr(name_table + name, ".resource_table"))
>   			continue;

How about ?
	if (strcmp(name_table + name, ".resource_table")) {
		if (strstr(name_table + name, ".resource_table"))
   			break;
		continue;
	}

Regards,
Peng.
>   
>   		table = (struct resource_table *)(elf_data + offset);