linux-kernel - Re: [PATCH 1/3] pstore: use snprintf

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Date:	Tue, 06 Jan 2015 09:20:37 -0800
From:	Joe Perches <joe@...ches.com>
To:	Mark Salyzyn <salyzyn@...roid.com>
Cc:	linux-kernel@...r.kernel.org, Anton Vorontsov <anton@...msg.org>,
	Colin Cross <ccross@...roid.com>,
	Kees Cook <keescook@...omium.org>,
	Tony Luck <tony.luck@...el.com>
Subject: Re: [PATCH 1/3] pstore: use snprintf

On Tue, 2015-01-06 at 09:15 -0800, Mark Salyzyn wrote:
> No guarantees that the names will not exceed the
> name buffer with future adjustments.
[]
> diff --git a/fs/pstore/inode.c b/fs/pstore/inode.c
[]
> @@ -338,32 +338,34 @@ int pstore_mkfile(enum pstore_type_id type, char *psname, u64 id, int count,
>  
>  	switch (type) {
>  	case PSTORE_TYPE_DMESG:
> -		sprintf(name, "dmesg-%s-%lld%s", psname, id,
> +		snprintf(name, sizeof(name), "dmesg-%s-%lld%s", psname, id,
>  						compressed ? ".enc.z" : "");

scnprintf to ensure null termination?

(and maybe better written like)

		scnprintf(name, sizeof(name), "dmesg-%s-%lld%s",
			  psname, id, compressed ? ".enc.z" : "");

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