lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <84adb06f-20f0-4e3d-9a6e-43e4b0d1b5ab@kernel.org>
Date: Wed, 4 Sep 2024 15:56:59 +0200
From: Konrad Dybcio <konradybcio@...nel.org>
To: Sibi Sankar <quic_sibis@...cinc.com>, sudeep.holla@....com,
 cristian.marussi@....com
Cc: linux-kernel@...r.kernel.org, arm-scmi@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-arm-msm@...r.kernel.org,
 johan@...nel.org, konradybcio@...nel.org
Subject: Re: [PATCH V2 2/2] firmware: arm_scmi: Skip adding bad duplicates

On 4.09.2024 5:13 AM, Sibi Sankar wrote:
> Ensure that the bad duplicates reported by the platform firmware doesn't
> get added to the opp-tables.
> 
> Signed-off-by: Sibi Sankar <quic_sibis@...cinc.com>
> ---
>  drivers/firmware/arm_scmi/perf.c | 13 +++++++++++--
>  1 file changed, 11 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/firmware/arm_scmi/perf.c b/drivers/firmware/arm_scmi/perf.c
> index 2d77b5f40ca7..114c3dd70ede 100644
> --- a/drivers/firmware/arm_scmi/perf.c
> +++ b/drivers/firmware/arm_scmi/perf.c
> @@ -386,9 +386,11 @@ process_response_opp(struct device *dev, struct perf_dom_info *dom,
>  		le16_to_cpu(r->opp[loop_idx].transition_latency_us);
>  
>  	ret = xa_insert(&dom->opps_by_lvl, opp->perf, opp, GFP_KERNEL);
> -	if (ret)
> +	if (ret) {
>  		dev_warn(dev, "Failed to add opps_by_lvl at %d for %s - ret:%d\n",
>  			 opp->perf, dom->info.name, ret);
> +		opp->perf = 0;
> +	}
>  }
>  
>  static inline void
> @@ -404,9 +406,12 @@ process_response_opp_v4(struct device *dev, struct perf_dom_info *dom,
>  		le16_to_cpu(r->opp[loop_idx].transition_latency_us);
>  
>  	ret = xa_insert(&dom->opps_by_lvl, opp->perf, opp, GFP_KERNEL);
> -	if (ret)
> +	if (ret) {
>  		dev_warn(dev, "Failed to add opps_by_lvl at %d for %s - ret:%d\n",
>  			 opp->perf, dom->info.name, ret);
> +		opp->perf = 0;
> +		return;
> +	}
>  
>  	/* Note that PERF v4 reports always five 32-bit words */
>  	opp->indicative_freq = le32_to_cpu(r->opp[loop_idx].indicative_freq);
> @@ -871,6 +876,10 @@ static int scmi_dvfs_device_opps_add(const struct scmi_protocol_handle *ph,
>  		else
>  			freq = dom->opp[idx].indicative_freq * dom->mult_factor;
>  
> +		/* Skip all invalid frequencies reported by the firmware */
> +		if (!freq)
> +			continue;

Maybe something like this instead? (not tested)

diff --git a/drivers/firmware/arm_scmi/perf.c b/drivers/firmware/arm_scmi/perf.c
index 2d77b5f40ca7..530692119c79 100644
--- a/drivers/firmware/arm_scmi/perf.c
+++ b/drivers/firmware/arm_scmi/perf.c
@@ -431,8 +431,14 @@ iter_perf_levels_process_response(const struct scmi_protocol_handle *ph,
 {
        struct scmi_opp *opp;
        struct scmi_perf_ipriv *p = priv;
+       unsigned int idx = st->desc_index + st->loop_idx;
+
+       opp = &p->perf_dom->opp[idx];
+
+       /* Avoid duplicate entries coming from buggy firmware */
+       if (idx > 0 && opp->perf && p->perf_dom->opp[idx - 1].perf)
+               return 0;
 
-       opp = &p->perf_dom->opp[st->desc_index + st->loop_idx];
        if (PROTOCOL_REV_MAJOR(p->version) <= 0x3)
                process_response_opp(ph->dev, p->perf_dom, opp, st->loop_idx,
                                     response);

Konrad

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ