From: Sascha Hauer <s.hauer@pengutronix.de>
To: Ahmad Fatoum <ahmad@a3f.at>
Cc: barebox@lists.infradead.org
Subject: Re: [PATCH v1 1/4] console: disallow opening for writing when no write method defined
Date: Mon, 23 Sep 2019 08:59:43 +0200 [thread overview]
Message-ID: <20190923065943.mrug644cnw24aabw@pengutronix.de> (raw)
In-Reply-To: <20190920075813.22471-1-ahmad@a3f.at>
On Fri, Sep 20, 2019 at 09:58:10AM +0200, Ahmad Fatoum wrote:
> Some consoles, like the input console (usually /dev/cs0), don't feature
> a puts or putc callback. Trying to echo out of them would thus crash:
>
> barebox@Embest MarS Board i.MX6Dual:/ echo -a /dev/cs0
> prefetch abort
> pc : [<00000004>] lr : [<4fd05071>]
> WARNING: [<...>] (fops_write+0xd/0x10)
> WARNING: [<...>] (devfs_write+0x21/0x2a)
> WARNING: [<...>] (__write+0xcb/0xf0)
> WARNING: [<...>] (write+0x2d/0x68)
> WARNING: [<...>] (dputc+0x31/0x34)
> WARNING: [<...>] (do_echo+0xcb/0x144)
>
> Fix this by only allowing open(.., O_WRONLY) or open(..., O_RDWR) when
> puts is defined. Consoles defining putc are covered by this as well as
> those have putc-calling __console_puts assigned as their puts when they
> are registered. Now echo -a /dev/cs0 would yield:
>
> open: Operation not permitted
>
> Signed-off-by: Ahmad Fatoum <ahmad@a3f.at>
> ---
Applied, thanks
Sascha
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prev parent reply other threads:[~2019-09-23 6:59 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-20 7:58 Ahmad Fatoum
2019-09-20 7:58 ` [PATCH v1 2/4] input: set console input name as input Ahmad Fatoum
2019-09-20 7:58 ` [PATCH v1 3/4] common: ubsan: ignore shifting one into sign bit Ahmad Fatoum
2019-09-21 7:47 ` Rouven Czerwinski
2019-09-21 10:59 ` Ahmad Fatoum
2019-09-20 7:58 ` [PATCH v1 4/4] USB: gadget: ACM: don't announce V.25ter support Ahmad Fatoum
2019-09-20 8:51 ` Ahmad Fatoum
2019-09-21 11:00 ` Ahmad Fatoum
2019-09-23 6:59 ` Sascha Hauer [this message]
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