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On Sunday 14 September 2008 23:38:08 Michael Sullivan wrote: |
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> On Sun, 2008-09-14 at 23:35 +0200, Pintér Tibor wrote: |
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> > Michael Sullivan írta: |
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> > > I think this is the same problem that wouldn't let me use su -. |
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> > > |
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> > > michael@bullet ~ $ passwd |
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> > > passwd: Authentication token manipulation error |
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> > > |
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> > > I'd like to change my password, but I can't. Any thoughts? |
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> > |
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> > readonly filesystem? |
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> > missing suid? |
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> > |
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> > t |
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> |
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> And how would I check for/fix that? |
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the passwd program is installed in /bin, so run 'mount' and check the options |
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it displays for the filesystem mounted at '/' and will look like this: |
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/dev/root on / type reiserfs (rw,noatime,notail) |
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You too should have 'rw' in the brackets |
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suid: this is not a program, it is an attribute that you can set for a program |
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file. I can see from your general comments that you are new to this game, so |
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I won't try just yet to explain what suid means. Just |
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run 'ls -al /usr/bin/passwd' and check that the first column looks like mine: |
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-rws--x--x 1 root root 38464 Aug 4 02:42 /bin/passwd |
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The 's' is vital, passwd will not work without it. |
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In another post you mentioned getresuid(). Pretend you never saw this - it is |
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a system call used by programmers when writing code. A user will never use |
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it. You already have the ability to make programs suid - it's built into the |
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kernel and the user programs that switch it on and off are part of a package |
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called coreutils. I 100% guarantee that it is installed on your machine. |
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-- |
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alan dot mckinnon at gmail dot com |
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