linux-kernel - Re: [PATCH 7/9] md: use kvmalloc rather than opencoded variant

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: <d80af165-9af1-97dc-edda-b1f8701164cd@suse.cz>
Date:   Mon, 30 Jan 2017 17:42:18 +0100
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Michal Hocko <mhocko@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     David Rientjes <rientjes@...gle.com>, Mel Gorman <mgorman@...e.de>,
        Johannes Weiner <hannes@...xchg.org>,
        Al Viro <viro@...iv.linux.org.uk>, linux-mm@...ck.org,
        LKML <linux-kernel@...r.kernel.org>,
        Michal Hocko <mhocko@...e.com>,
        Mikulas Patocka <mpatocka@...hat.com>,
        Mike Snitzer <snitzer@...hat.com>
Subject: Re: [PATCH 7/9] md: use kvmalloc rather than opencoded variant

On 01/30/2017 10:49 AM, Michal Hocko wrote:
> From: Michal Hocko <mhocko@...e.com>
>
> copy_params uses kmalloc with vmalloc fallback. We already have a helper
> for that - kvmalloc. This caller requires GFP_NOIO semantic so it hasn't
> been converted with many others by previous patches. All we need to
> achieve this semantic is to use the scope memalloc_noio_{save,restore}
> around kvmalloc.
>
> Cc: Mikulas Patocka <mpatocka@...hat.com>
> Cc: Mike Snitzer <snitzer@...hat.com>
> Signed-off-by: Michal Hocko <mhocko@...e.com>

Acked-by: Vlastimil Babka <vbabka@...e.cz>

> ---
>  drivers/md/dm-ioctl.c | 13 ++++---------
>  1 file changed, 4 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
> index a5a9b17f0f7f..dbf5b981f7d7 100644
> --- a/drivers/md/dm-ioctl.c
> +++ b/drivers/md/dm-ioctl.c
> @@ -1698,6 +1698,7 @@ static int copy_params(struct dm_ioctl __user *user, struct dm_ioctl *param_kern
>  	struct dm_ioctl *dmi;
>  	int secure_data;
>  	const size_t minimum_data_size = offsetof(struct dm_ioctl, data);
> +	unsigned noio_flag;
>
>  	if (copy_from_user(param_kernel, user, minimum_data_size))
>  		return -EFAULT;
> @@ -1720,15 +1721,9 @@ static int copy_params(struct dm_ioctl __user *user, struct dm_ioctl *param_kern
>  	 * Use kmalloc() rather than vmalloc() when we can.
>  	 */
>  	dmi = NULL;
> -	if (param_kernel->data_size <= KMALLOC_MAX_SIZE)
> -		dmi = kmalloc(param_kernel->data_size, GFP_NOIO | __GFP_NORETRY | __GFP_NOMEMALLOC | __GFP_NOWARN);
> -
> -	if (!dmi) {
> -		unsigned noio_flag;
> -		noio_flag = memalloc_noio_save();
> -		dmi = __vmalloc(param_kernel->data_size, GFP_NOIO | __GFP_HIGH | __GFP_HIGHMEM, PAGE_KERNEL);
> -		memalloc_noio_restore(noio_flag);
> -	}
> +	noio_flag = memalloc_noio_save();
> +	dmi = kvmalloc(param_kernel->data_size, GFP_KERNEL);
> +	memalloc_noio_restore(noio_flag);
>
>  	if (!dmi) {
>  		if (secure_data && clear_user(user, param_kernel->data_size))
>