linux-kernel - Re: [PATCH next 1/2] printk: avoid and/or handle record truncation

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Message-ID: <20200929130410.GC529@jagdpanzerIV.localdomain>
Date:   Tue, 29 Sep 2020 22:04:10 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:     John Ogness <john.ogness@...utronix.de>
Cc:     Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH next 1/2] printk: avoid and/or handle record truncation

On (20/09/26 04:01), John Ogness wrote:
> +	if (text_len > buf_size) {
> +		text_len = buf_size;
> +		truncated = true;
> +	}
> +
>  	prefix_len = info_print_prefix(r->info, syslog, time, prefix);
>  
>  	/*
> @@ -1911,7 +1916,7 @@ static size_t log_output(int facility, int level, enum log_flags lflags,
>  		struct printk_record r;
>  
>  		prb_rec_init_wr(&r, text_len);
> -		if (prb_reserve_in_last(&e, prb, &r, caller_id)) {
> +		if (prb_reserve_in_last(&e, prb, &r, caller_id, LOG_LINE_MAX)) {

Are we going to pass anything other than LOG_LINE_MAX? If not then
maybe we can drop that argument and compare the text_buf_size to
LOG_LINE_MAX?

	-ss