linux-kernel - RE: [PATCH 3/3] remoteproc: Add coredump sysfs attribute

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: <8b807eab057e4dfabbc48d31cbf0b4cc@SFHDAG7NODE2.st.com>
Date:   Fri, 17 Apr 2020 07:54:50 +0000
From:   Loic PALLARDY <loic.pallardy@...com>
To:     Rishabh Bhatnagar <rishabhb@...eaurora.org>,
        "linux-remoteproc@...r.kernel.org" <linux-remoteproc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "bjorn.andersson@...aro.org" <bjorn.andersson@...aro.org>,
        "ohad@...ery.com" <ohad@...ery.com>,
        "mathieu.poirier@...aro.org" <mathieu.poirier@...aro.org>,
        "tsoni@...eaurora.org" <tsoni@...eaurora.org>,
        "psodagud@...eaurora.org" <psodagud@...eaurora.org>,
        "sidgup@...eaurora.org" <sidgup@...eaurora.org>
Subject: RE: [PATCH 3/3] remoteproc: Add coredump sysfs attribute

Hi Rishabh,

> -----Original Message-----
> From: linux-remoteproc-owner@...r.kernel.org <linux-remoteproc-
> owner@...r.kernel.org> On Behalf Of Rishabh Bhatnagar
> Sent: jeudi 16 avril 2020 20:39
> To: linux-remoteproc@...r.kernel.org; linux-kernel@...r.kernel.org
> Cc: bjorn.andersson@...aro.org; ohad@...ery.com;
> mathieu.poirier@...aro.org; tsoni@...eaurora.org;
> psodagud@...eaurora.org; sidgup@...eaurora.org; Rishabh Bhatnagar
> <rishabhb@...eaurora.org>
> Subject: [PATCH 3/3] remoteproc: Add coredump sysfs attribute
> 
> Add coredump sysfs attribute to configure the type of memory dump.
> User can select between default or inline coredump functionality.
> Also coredump collection can be disabled through this interface.
> This functionality can be configured differently for different
> remote processors.
> This provides an option to dynamically configure the dump type
> based on userpsace capability.
I think this should be under debugfs as it is not link to remoteproc control but only
to its debug capability. Moreover other fields related to coredump are already un debugfs control.

Regards,
Loic
> 
> Signed-off-by: Rishabh Bhatnagar <rishabhb@...eaurora.org>
> ---
>  drivers/remoteproc/remoteproc_sysfs.c | 57
> +++++++++++++++++++++++++++++++++++
>  1 file changed, 57 insertions(+)
> 
> diff --git a/drivers/remoteproc/remoteproc_sysfs.c
> b/drivers/remoteproc/remoteproc_sysfs.c
> index 7f8536b..d112664 100644
> --- a/drivers/remoteproc/remoteproc_sysfs.c
> +++ b/drivers/remoteproc/remoteproc_sysfs.c
> @@ -9,6 +9,62 @@
> 
>  #define to_rproc(d) container_of(d, struct rproc, dev)
> 
> +/*
> + * A coredump-configuration-to-string lookup table, for exposing a
> + * human readable configuration via sysfs. Always keep in sync with
> + * enum rproc_coredump_conf
> + */
> +static const char * const rproc_coredump_str[] = {
> +	[COREDUMP_DEFAULT]	= "default",
> +	[COREDUMP_INLINE]	= "inline",
> +	[COREDUMP_DISABLED]	= "disabled",
> +};
> +
> +/* Expose the current coredump configuration via sysfs */
> +static ssize_t coredump_show(struct device *dev, struct device_attribute
> *attr,
> +			      char *buf)
> +{
> +	struct rproc *rproc = to_rproc(dev);
> +
> +	return sprintf(buf, "%s\n", rproc_coredump_str[rproc-
> >coredump_conf]);
> +}
> +
> +/* Change the coredump configuration via sysfs */
> +static ssize_t coredump_store(struct device *dev, struct device_attribute
> *attr,
> +			       const char *buf, size_t count)
> +{
> +	struct rproc *rproc = to_rproc(dev);
> +	int err;
> +
> +	err = mutex_lock_interruptible(&rproc->lock);
> +	if (err) {
> +		dev_err(dev, "can't lock rproc %s: %d\n", rproc->name, err);
> +		return -EINVAL;
> +	}
> +
> +	if (rproc->state == RPROC_CRASHED) {
> +		dev_err(dev, "can't change coredump configuration\n");
> +		err = -EBUSY;
> +		goto out;
> +	}
> +
> +	if (sysfs_streq(buf, "disable"))
> +		rproc->coredump_conf = COREDUMP_DISABLED;
> +	else if (sysfs_streq(buf, "inline"))
> +		rproc->coredump_conf = COREDUMP_INLINE;
> +	else if (sysfs_streq(buf, "default"))
> +		rproc->coredump_conf = COREDUMP_DEFAULT;
> +	else {
> +		dev_err(dev, "Invalid coredump configuration\n");
> +		err = -EINVAL;
> +	}
> +out:
> +	mutex_unlock(&rproc->lock);
> +
> +	return err ? err : count;
> +}
> +static DEVICE_ATTR_RW(coredump);
> +
>  /* Expose the loaded / running firmware name via sysfs */
>  static ssize_t firmware_show(struct device *dev, struct device_attribute
> *attr,
>  			  char *buf)
> @@ -127,6 +183,7 @@ static ssize_t name_show(struct device *dev, struct
> device_attribute *attr,
>  	&dev_attr_firmware.attr,
>  	&dev_attr_state.attr,
>  	&dev_attr_name.attr,
> +	&dev_attr_coredump.attr,
>  	NULL
>  };
> 
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora
> Forum,
> a Linux Foundation Collaborative Project