On Wed, Jan 16, 2008 at 03:09:45AM +0300, Ilya N. Golubev wrote:
> Version: 2.13.1-rc2, without any changes.
>
> It is not necessarily bug of util-linux itself. However, since there
> is no other well known tool to make arbitrary `mount' system call, and
> specify to it as many options as `mount' program from util-linux
> allows, this program is the only way to reproduce the failure. And
> even determining that it is something outside `mount' program is
> broken requires full- blown debugging of the program.
>
> File system may contain data not to let any logged in user read. Wish
> to specify more restrictive mode of files in it. This certainly must
> occur on mount itself, not in subsequent `chmod' calls. There is at
> least one obvious reason to avoid explicit `chmod', just as many other
> uses of it: possible race condition between it and other process
> opening the file. Seeing no way to have `mount' do that.
>
> When mounting read- only iso9660 file system, `mount' ignores
> `mode=400' file system option. More precisely,
I don't think it ignores the 'mode' option.
# ./mount -t iso9660 -o ro,norock,mode=0400,uid=500 /dev/scd0 /mnt/cdrom
# ls -lan /mnt/cdrom/
total 193770
dr-xr-xr-x 1 500 0 2048 2003-11-25 18:06 .
drwxr-xr-x 14 0 0 4096 2007-10-17 02:05 ..
-r-------- 1 500 0 25214 2003-08-28 09:46 AUTORUN.ICO
-r-------- 1 500 0 46 2003-09-08 05:26 AUTORUN.INF
-r-------- 1 500 0 1033834 2003-11-21 10:10 DATA1.CAB
-r-------- 1 500 0 205406 2003-11-21 10:22 DATA1.HDR
-r-------- 1 500 0 196390173 2003-11-21 10:22 DATA2.CAB
dr-xr-xr-x 1 500 0 2048 2003-10-23 06:28 DIRECTX
-r-------- 1 500 0 344923 2001-09-04 22:24 IKERNEL.EX_
-r-------- 1 500 0 417 2003-11-21 10:22 LAYOUT.BIN
dr-xr-xr-x 1 500 0 2048 2003-11-21 13:01 MANUALS
-r-------- 1 500 0 167936 2001-09-04 23:03 SETUP.EXE
-r-------- 1 500 0 229 2003-11-21 10:09 SETUP.INI
-r-------- 1 500 0 235068 2003-11-21 10:09 SETUP.INX
it seems the 'mode' option doesn't effect on directories, but it's an
iso9660 & kernel problem. The mount(8) correctly calls mount(2) with
mode option.
You can try more verbose mode (mount -v -v -v) or strace.
Karel
--
Karel Zak <kzak@xxxxxxxxxx>
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