[Bug 531265] Re: Linux 2.6.32-15-generic does not correctly handle permissions

[Claudio Moretti]

I understand this, but cannot understand what does the read permission on a
folder implies.
Can you explain this to me? =) (Or give me the posix definition you were
reading, which is definitely faster)
Thanks!

On Fri, Mar 5, 2010 at 02:26, Andy Whitcroft <apw at canonical.com> wrote:

> @Claudio -- the execute permission bit on a directory is the 'traversal'
> bit, without this bit a user is not permitted to pass through this
> directory to open a file even if the file is readable.  That applied to
> chdir() and getdents() equally, preventing a cd into the directory.
> This behaviour seems as expected from the posix definition to my
> reading.
>
> ** Changed in: linux (Ubuntu)
>       Status: New => Invalid
>
> ** Changed in: linux (Ubuntu)
>     Assignee: (unassigned) => Andy Whitcroft (apw)
>
> --
> Linux 2.6.32-15-generic does not correctly handle permissions
> https://bugs.launchpad.net/bugs/531265
> You received this bug notification because you are a direct subscriber
> of the bug.
>
> Status in “linux” package in Ubuntu: Invalid
>
> Bug description:
> I cannot cd to a folder not owned by me, without having set the execute
> permission on a folder, even if there is the "universe read" one.
> I can however edit files that don't have the x permission.
> Steps to reproduce:
>
> 1) Create a folder
> 2) chown that folder to another user
> 3) chmod it to drwx--x--x (run as root: chmod a-rwx foldername && chmod a+r
> foldername)
> 4) try to cd into it
>
> root at Jarvis:~# mkdir test
> root at Jarvis:~# chmod a-rwx test && chmod a+r test
> root at Jarvis:~# ls -l |grep test
> dr--r--r-- 2 root    root      4096 2010-03-03 12:10 test
>
> claudio at Jarvis:~$ cd test/
> bash: cd: test/: Permesso negato
>
> =================================================================
> claudio at Jarvis:~$ uname -a
> Linux Jarvis 2.6.32-15-generic #22-Ubuntu SMP Tue Mar 2 02:23:29 UTC 2010
> x86_64 GNU/Linux
> claudio at Jarvis:~$ cat /proc/version_signature
> Ubuntu 2.6.32-15.22-generic
>
> ProblemType: Bug
> AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
> Architecture: amd64
> ArecordDevices:
>  **** List of CAPTURE Hardware Devices ****
>  card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
>   Subdevices: 1/1
>   Subdevice #0: subdevice #0
> AudioDevicesInUse:
>  USER        PID ACCESS COMMAND
>  /dev/snd/controlC0:  claudio    1889 F.... pulseaudio
> CRDA:
>  country 98:
>        (2402 - 2482 @ 40), (N/A, 20)
> Card0.Amixer.info:
>  Card hw:0 'Intel'/'HDA Intel at 0xfebfc000 irq 21'
>   Mixer name   : 'SigmaTel STAC9205'
>   Components   : 'HDA:838476a0,10280228,00100204
> HDA:14f12c06,14f1000f,00100000'
>   Controls      : 19
>   Simple ctrls  : 11
> Date: Wed Mar  3 12:03:07 2010
> DistroRelease: Ubuntu 10.04
> HibernationDevice: RESUME=UUID=3be917d1-4bb8-4d17-846b-88461c8a74b3
> MachineType: Dell Inc. Vostro 1500
> NonfreeKernelModules: nvidia
> Package: linux-image-2.6.32-15-generic 2.6.32-15.22
> ProcCmdLine: BOOT_IMAGE=/vmlinuz-2.6.32-15-generic
> root=/dev/mapper/sda6_crypt ro quiet
> ProcEnviron:
>  LANG=it_IT.utf8
>  SHELL=/bin/bash
> ProcVersionSignature: Ubuntu 2.6.32-15.22-generic
> Regression: No
> RelatedPackageVersions: linux-firmware 1.31
> Reproducible: Yes
> SourcePackage: linux
> TestedUpstream: No
> Uname: Linux 2.6.32-15-generic x86_64
> dmi.bios.date: 04/21/2008
> dmi.bios.vendor: Dell Inc.
> dmi.bios.version: A06
> dmi.board.name: 0WY040
> dmi.board.vendor: Dell Inc.
> dmi.chassis.type: 8
> dmi.chassis.vendor: Dell Inc.
> dmi.modalias:
> dmi:bvnDellInc.:bvrA06:bd04/21/2008:svnDellInc.:pnVostro1500:pvr:rvnDellInc.:rn0WY040:rvr:cvnDellInc.:ct8:cvr:
> dmi.product.name: Vostro 1500
> dmi.sys.vendor: Dell Inc.
>
> To unsubscribe from this bug, go to:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/531265/+subscribe
>

-- 
Linux 2.6.32-15-generic does not correctly handle permissions
https://bugs.launchpad.net/bugs/531265
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