From: He Zhe <zhe.he@windriver.com>
To: Petr Mladek <pmladek@suse.com>
Cc: <sergey.senozhatsky@gmail.com>, <rostedt@goodmis.org>,
<linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v5 4/4] printk: Give error on attempt to set log buffer length to over 4G
Date: Tue, 9 Oct 2018 00:30:12 +0800 [thread overview]
Message-ID: <2a9ea0e6-f1df-7dcd-e2e8-383e297ccc5f@windriver.com> (raw)
In-Reply-To: <20181008135916.gg4kkmoki5bgtco5@pathway.suse.cz>
On 2018年10月08日 21:59, Petr Mladek wrote:
> I tried this patch with log_buf_len=5G. The kernel did not crash
> but dmesg shown some mess. There are several 32-bit variables
> to store the size, for example:
>
> static u32 log_buf_len = __LOG_BUF_LEN;
> u32 log_buf_len_get(void)
> static u32 log_first_idx;
> static u32 log_next_idx;
>
> I guess that the code somewhere does not detect an overflows
> correctly.
>
> I am not motivated enought to add support for such huge message
> buffer. Therefore I suggest to limit it to 32G for now.
I'm also fine with this suggestion. Thanks.
Zhe
next prev parent reply other threads:[~2018-10-08 16:30 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-29 16:45 [PATCH v5 1/4] printk: Fix panic caused by passing log_buf_len to command line zhe.he
2018-09-29 16:45 ` [PATCH v5 2/4] printk: Correct wrong casting zhe.he
2018-10-02 5:50 ` Sergey Senozhatsky
2018-10-08 13:03 ` Petr Mladek
2018-09-29 16:45 ` [PATCH v5 3/4] printk: Add KBUILD_MODNAME and remove a redundant print prefix zhe.he
2018-10-02 5:52 ` Sergey Senozhatsky
2018-10-08 13:04 ` Petr Mladek
2018-09-29 16:45 ` [PATCH v5 4/4] printk: Give error on attempt to set log buffer length to over 4G zhe.he
2018-10-02 5:51 ` Sergey Senozhatsky
2018-10-08 13:59 ` Petr Mladek
2018-10-08 14:59 ` Sergey Senozhatsky
2018-10-09 13:05 ` Petr Mladek
2018-10-09 13:57 ` Sergey Senozhatsky
2018-10-10 8:09 ` Petr Mladek
2018-10-10 8:21 ` Sergey Senozhatsky
2018-10-08 16:30 ` He Zhe [this message]
2018-10-02 5:48 ` [PATCH v5 1/4] printk: Fix panic caused by passing log_buf_len to command line Sergey Senozhatsky
2018-10-08 13:01 ` Petr Mladek
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