linux-hardening - Re: support pmsg record size larger than kmalloc limitation

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Date:   Tue, 27 Jun 2023 13:28:11 -0700
From:   Yuxiao Zhang <yuxiaozh.zhang@...il.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     Yuxiao Zhang <yuxiaozhang@...gle.com>, keescook@...omium.org,
        tony.luck@...el.com, gpiccoli@...lia.com,
        linux-hardening@...r.kernel.org,
        William Kennington <wak@...gle.com>,
        linux-kernel@...r.kernel.org
Subject: Re: support pmsg record size larger than kmalloc limitation

Thanks for the pointer, the document is very helpful. Seems that I cannot use gmail to send patches. I sent it again by git send-email. I also tested myself that the patch is well-formatted. Hopefully this time it works.

> On Jun 27, 2023, at 10:35 AM, Greg KH <gregkh@...uxfoundation.org> wrote:
> 
> On Tue, Jun 27, 2023 at 10:05:04AM -0700, Yuxiao Zhang wrote:
>>  kfree(record->priv);
>>  kfree(record);
>>  if (rc != -EEXIST || !quiet)
>> diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
>> index ade66dbe5f39..296465b14fa9 100644
>> --- a/fs/pstore/ram.c
>> +++ b/fs/pstore/ram.c
>> @@ -20,6 +20,7 @@
>> #include <linux/compiler.h>
>> #include <linux/of.h>
>> #include <linux/of_address.h>
>> +#include <linux/mm.h>
>> 
>> #include "internal.h"
>> #include "ram_internal.h"
>> @@ -268,7 +269,7 @@ static ssize_t ramoops_pstore_read(struct
>> pstore_record *record)
>>  /* ECC correction notice */
>>  record->ecc_notice_size = persistent_ram_ecc_string(prz, NULL, 0);
>> 
>> - record->buf = kmalloc(size + record->ecc_notice_size + 1, GFP_KERNEL);
>> + record->buf = kvmalloc(size + record->ecc_notice_size + 1, GFP_KERNEL);
>>  if (record->buf == NULL) {
>>  size = -ENOMEM;
>>  goto out;
> 
> Please try emailing a patch to yourself and see if you can apply it
> afterwards.  The kernel documentation has a section for how to handle
> email clients, perhaps you should read it?
> 
> thanks,
> 
> greg k-h