linux-kernel - Re: uml: using hostfs as rootfs is not working

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] [day] [month] [year] [list]

Date:	Fri, 21 Nov 2008 17:44:26 +0000
From:	Américo Wang <xiyou.wangcong@...il.com>
To:	Jan Engelhardt <jengelh@...ozas.de>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	jdike@...toit.com
Subject: Re: uml: using hostfs as rootfs is not working

On Wed, Nov 19, 2008 at 07:32:16PM +0100, Jan Engelhardt wrote:
>Hi,
>

Hi, Jan!


>
>as per Documentation/uml/*txt, I issued the following to get a direct 
>hostfs:
>
>	./linux ubd0=/tftpboot/linux
>
>(/tftpboot/linux/sbin/init exists), but the UM kernel only gives:
>
>Failed to open '/home/tftpboot/linux', errno = 21


I think this error comes from arch/um/drivers/ubd_kern.c::ubd_open_dev()


>ubda: Can't open "/home/tftpboot/linux": errno = 21

This is from the caller: ubd_open().

ubd_open_dev() calls open_ubd_file() to open the ubd device, which, in
turn, calls os_open_file() which is a wrapper of open64().

And errno 21 should be EISDIR, for open(), which means we invoked it
with a writing operation, probably O_RDWR...

So I think there must be something wrong in the code, writing to a
directory is suspicious...

I will try to check it.

Thank you!

-- 
"Sometimes the only way to stay sane is to go a little crazy."

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/