linux-kernel - Re: [PATCH v6 2/4] remoteproc: coredump: Add minidump functionality

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Message-ID: <20201102174740.GA223412@builder.lan>
Date:   Mon, 2 Nov 2020 11:47:40 -0600
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Siddharth Gupta <sidgup@...eaurora.org>
Cc:     agross@...nel.org, ohad@...ery.com,
        linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, tsoni@...eaurora.org,
        psodagud@...eaurora.org, rishabhb@...eaurora.org,
        linux-doc@...r.kernel.org
Subject: Re: [PATCH v6 2/4] remoteproc: coredump: Add minidump functionality

On Thu 29 Oct 18:54 CDT 2020, Siddharth Gupta wrote:

> 
> On 10/26/2020 2:09 PM, Bjorn Andersson wrote:
> > On Fri 02 Oct 21:05 CDT 2020, Siddharth Gupta wrote:
[..]
> > > diff --git a/drivers/remoteproc/remoteproc_elf_helpers.h b/drivers/remoteproc/remoteproc_elf_helpers.h
> > > index 4b6be7b..d83ebca 100644
> > > --- a/drivers/remoteproc/remoteproc_elf_helpers.h
> > > +++ b/drivers/remoteproc/remoteproc_elf_helpers.h
> > > @@ -11,6 +11,7 @@
> > >   #include <linux/elf.h>
> > >   #include <linux/types.h>
> > > +#define MAX_NAME_LENGTH 16
> > This name is too generic. Why is it 16?
> 
> I will update the name to  MAX_SHDR_NAME_LEN. In our usecase we didn't
> expect a length of the section name to exceed
> 16 characters (MAX_REGION_NAME_LENGTH defined in qcom_minidump.h in patch
> 03/04). It might change later if users
> want to increase the size. What would you prefer the max name length for the
> section header to be?
> 

If you calculate the size of the region based on the strings I don't see
why you need to limit it here - and you shouldn't use a bounded version
of strcpy in this case either.

I don't think this part of the code should truncate the strings, if we
need to sanitize the strings make sure to do that when you populate the
list.

Thanks,
Bjorn