linux-kernel - Re: [PATCH 2/2] [PATCH 2/2] proc-vmcore: wrong data type casting fix

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: <20160311071935.GA28205@dhcp-128-25.nay.redhat.com>
Date:	Fri, 11 Mar 2016 15:19:35 +0800
From:	Minfei Huang <mhuang@...hat.com>
To:	dyoung@...hat.com
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	d.hatayama@...fujitsu.com, bhe@...hat.com, vgoyal@...hat.com,
	kexec@...ts.infradead.org
Subject: Re: [PATCH 2/2] [PATCH 2/2] proc-vmcore: wrong data type casting fix

On 03/11/16 at 02:21pm, dyoung@...hat.com wrote:
> @@ -231,7 +231,8 @@ static ssize_t __read_vmcore(char *buffe
>  
>  	list_for_each_entry(m, &vmcore_list, list) {
>  		if (*fpos < m->offset + m->size) {
> -			tsz = min_t(size_t, m->offset + m->size - *fpos, buflen);
> +			tsz = (size_t)min_lt(m->offset + m->size - *fpos,
> +					    buflen);
>  			start = m->paddr + *fpos - m->offset;
>  			tmp = read_from_oldmem(buffer, tsz, &start, userbuf);
>  			if (tmp < 0)
> @@ -461,7 +462,7 @@ static int mmap_vmcore(struct file *file
>  		if (start < m->offset + m->size) {
>  			u64 paddr = 0;
>  
> -			tsz = min_t(size_t, m->offset + m->size - start, size);
> +			tsz = (size_t)min_lt(m->offset + m->size - start, size);
>  			paddr = m->paddr + start - m->offset;
>  			if (vmcore_remap_oldmem_pfn(vma, vma->vm_start + len,
>  						    paddr >> PAGE_SHIFT, tsz,

Hi, Dave.

Seems the previous parameter is unsigned long long, and the later one is
size_t. The size of both these types doesn't change in running time, why
not use min_t(unsigned long long, a, b) instead?

Thanks
Minfei