linux-kernel - Re: [RFC v1 2/4] nvmet-trace: null terminate device name string correctly

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: <20230905064921.GB19701@lst.de>
Date:   Tue, 5 Sep 2023 08:49:21 +0200
From:   Christoph Hellwig <hch@....de>
To:     Daniel Wagner <dwagner@...e.de>
Cc:     linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Hannes Reinecke <hare@...e.de>,
        Sagi Grimberg <sagi@...mberg.me>,
        Jason Gunthorpe <jgg@...pe.ca>,
        James Smart <james.smart@...adcom.com>,
        Chaitanya Kulkarni <kch@...dia.com>,
        Christoph Hellwig <hch@....de>
Subject: Re: [RFC v1 2/4] nvmet-trace: null terminate device name string
 correctly

On Tue, Aug 29, 2023 at 11:13:47AM +0200, Daniel Wagner wrote:
> Signed-off-by: Daniel Wagner <dwagner@...e.de>
> ---
>  drivers/nvme/target/trace.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/nvme/target/trace.h b/drivers/nvme/target/trace.h
> index 6997bd7e45cf..9ba466b49613 100644
> --- a/drivers/nvme/target/trace.h
> +++ b/drivers/nvme/target/trace.h
> @@ -55,8 +55,8 @@ static inline void __assign_req_name(char *name, struct nvmet_req *req)
>  		return;
>  	}
>  
> -	strncpy(name, req->ns->device_path,
> -		min_t(size_t, DISK_NAME_LEN, strlen(req->ns->device_path)));
> +	strscpy(name, req->ns->device_path,
> +		min_t(size_t, DISK_NAME_LEN, strlen(req->ns->device_path) + 1));

I'd just switch to snprintf instead, that the best way to ensure
termination..