Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > comp.os.linux.development.system > #468
| From | Tauno Voipio <tauno.voipio@notused.fi.invalid> |
|---|---|
| Newsgroups | comp.os.linux.development.system |
| Subject | Re: "Permission denied" while reading file /proc/<pid>/maps with permissions '-r--r--r--' |
| Date | 2012-10-02 20:14 +0300 |
| Organization | A noiseless patient Spider |
| Message-ID | <k4f7du$ind$1@dont-email.me> (permalink) |
| References | <20de89c1-dcb3-42b2-b281-d22af2035db5@googlegroups.com> <87ehlh9d99.fsf@araminta.anjou.terraraq.org.uk> <c8cf57cb-5078-4996-9cea-c36d36c98348@googlegroups.com> |
On 2.10.12 5:20 , Alex Vinokur wrote: > On Tuesday, October 2, 2012 4:09:38 PM UTC+2, Richard Kettlewell wrote: >> Alex Vinokur <alex.vinokur@gmail.com> writes: >> >>> Could anybody explain why we have 'Permission denied' here? >> >>> >> >>> Thanks >> >>> >> >>> >> >>> >> >>>> uname -a >> >>> Linux machine1 2.6.32-279.el6.x86_64 #1 SMP Wed Jun 13 18:24:36 EDT 2012 x86_64 x86_64 x86_64 GNU/Linux >> >>> >> >>>> id >> >>> uid=75308(user1) gid=100(users) groups=100(users) >> >>> >> >>>> ps -ef | grep 25796 >> >>> root 25796 15752 0 15:11 pts/30 00:00:00 ssh -l root machine2 >> >>> user1 26737 13908 0 15:19 pts/23 00:00:00 grep 25796 >> >>> >> >>>> ls -ld /proc/25796/maps >> >>> -r--r--r-- 1 root root 0 Oct 2 15:12 /proc/25796/maps >> >>> >> >>>> cat /proc/25796/maps >> >>> cat: /proc/25796/maps: Permission denied >> >> >> >> Because there's an extra check built into the kernel to stop you reading >> >> that file without a matching UID or the ptrace capability. >> >> >> >> -- >> >> http://www.greenend.org.uk/rjk/ > > Thanks, > > But the file has -r--r--r-- permissions. > So, any process with any effective user may read such a file. > > >> ls -ld /proc/25796/maps > -r--r--r-- 1 root root 0 Oct 2 15:12 /proc/25796/maps The 'files' in /proc are no regular files. They are peepholes into the internals of the kernel. The kernel may impose whatever additional restrictions it deems fit. -- Tauno Voipio
Back to comp.os.linux.development.system | Previous | Next — Previous in thread | Next in thread | Find similar
"Permission denied" while reading file /proc/<pid>/maps with permissions '-r--r--r--' Alex Vinokur <alex.vinokur@gmail.com> - 2012-10-02 07:05 -0700
Re: "Permission denied" while reading file /proc/<pid>/maps with permissions '-r--r--r--' Richard Kettlewell <rjk@greenend.org.uk> - 2012-10-02 15:09 +0100
Re: "Permission denied" while reading file /proc/<pid>/maps with permissions '-r--r--r--' Alex Vinokur <alex.vinokur@gmail.com> - 2012-10-02 07:20 -0700
Re: "Permission denied" while reading file /proc/<pid>/maps with permissions '-r--r--r--' Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2012-10-02 20:14 +0300
Re: "Permission denied" while reading file /proc/<pid>/maps with permissions '-r--r--r--' Alex Vinokur <alex.vinokur@gmail.com> - 2012-10-02 10:46 -0700
Re: "Permission denied" while reading file /proc/<pid>/maps with permissions '-r--r--r--' Josef Moellers <josef.moellers@invalid.invalid> - 2012-10-03 12:39 +0200
Re: "Permission denied" while reading file /proc/<pid>/maps with permissions '-r--r--r--' Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2012-10-11 01:53 +0300
Re: "Permission denied" while reading file /proc/<pid>/maps with permissions '-r--r--r--' Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2012-10-11 01:58 +0300
Re: "Permission denied" while reading file /proc/<pid>/maps with permissions '-r--r--r--' Richard Kettlewell <rjk@greenend.org.uk> - 2012-10-02 20:08 +0100
Re: "Permission denied" while reading file /proc/<pid>/maps with permissions '-r--r--r--' pacman@kosh.dhis.org (Alan Curry) - 2012-10-02 21:44 +0000
Re: "Permission denied" while reading file /proc/<pid>/maps with permissions '-r--r--r--' Alex Vinokur <alex.vinokur@gmail.com> - 2012-10-02 23:16 -0700
Re: "Permission denied" while reading file /proc/<pid>/maps with permissions '-r--r--r--' Richard Kettlewell <rjk@greenend.org.uk> - 2012-10-03 09:35 +0100
Re: "Permission denied" while reading file /proc/<pid>/maps with permissions '-r--r--r--' a.c.kalker@gmail.com - 2013-07-14 06:08 -0700
Re: "Permission denied" while reading file /proc/<pid>/maps with permissions '-r--r--r--' Jorgen Grahn <grahn+nntp@snipabacken.se> - 2013-07-14 17:08 +0000
Re: "Permission denied" while reading file /proc/<pid>/maps with permissions '-r--r--r--' crankypuss <crankypuss@nomail.invalid> - 2013-07-15 02:41 -0600
Re: "Permission denied" while reading file /proc/<pid>/maps with permissions '-r--r--r--' Jorgen Grahn <grahn+nntp@snipabacken.se> - 2013-07-15 10:06 +0000
Re: "Permission denied" while reading file /proc/<pid>/maps with permissions '-r--r--r--' Richard Kettlewell <rjk@greenend.org.uk> - 2013-07-15 10:05 +0100
Re: "Permission denied" while reading file /proc/<pid>/maps with permissions '-r--r--r--' crankypuss <crankypuss@nomail.invalid> - 2013-07-15 03:51 -0600
Re: "Permission denied" while reading file /proc/<pid>/maps with permissions '-r--r--r--' Richard Kettlewell <rjk@greenend.org.uk> - 2013-07-15 11:32 +0100
Re: "Permission denied" while reading file /proc/<pid>/maps with permissions '-r--r--r--' crankypuss <crankypuss@nomail.invalid> - 2013-07-16 03:50 -0600
Re: "Permission denied" while reading file /proc/<pid>/maps with permissions '-r--r--r--' Richard Kettlewell <rjk@greenend.org.uk> - 2013-07-16 11:29 +0100
Re: "Permission denied" while reading file /proc/<pid>/maps with permissions '-r--r--r--' crankypuss <crankypuss@nomail.invalid> - 2013-07-16 04:53 -0600
Re: "Permission denied" while reading file /proc/<pid>/maps with permissions '-r--r--r--' Rainer Weikusat <rweikusat@mssgmbh.com> - 2013-07-16 13:06 +0100
Re: "Permission denied" while reading file /proc/<pid>/maps with permissions '-r--r--r--' crankypuss <crankypuss@nomail.invalid> - 2013-07-17 01:52 -0600
Re: "Permission denied" while reading file /proc/<pid>/maps with permissions '-r--r--r--' Jorgen Grahn <grahn+nntp@snipabacken.se> - 2013-07-16 19:04 +0000
Re: "Permission denied" while reading file /proc/<pid>/maps with permissions '-r--r--r--' crankypuss <crankypuss@nomail.invalid> - 2013-07-17 02:21 -0600
csiph-web