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Why can't I chown a pipe?

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2

1

From a discussion on useless use of cat.

I decided to see if It was possible to avoid some of the troubles by changing the owner of the pipe. So I did:

# cat | cat &

[1] 16500

# cd /proc/16500/fd

# ls -l

lr-x------ root root 0 -> pipe:[931613]

lrwx------ root root 1 -> /dev/tty1

lrwx------ root root 2 -> /dev/tty1

# chown --dereference daemon 0

# ls -l

lr-x------ root root 0 -> pipe:[931613]

lrwx------ root root 1 -> /dev/tty1

lrwx------ root root 2 -> /dev/tty1

I also tried chown and chown -L. No go. I'm convinced this is simply impossible, but why? They clearly have inodes. That 931613 is the inode number.

In the case I am actually interested in, the process on the right would be running at lower privileges and I'd kind of like it to own its own handles so that it can re-open them.

pipe chown

share|improve this question

asked 6 hours ago

JoshuaJoshua

1,332816

add a comment | 

2

1

From a discussion on useless use of cat.

I decided to see if It was possible to avoid some of the troubles by changing the owner of the pipe. So I did:

# cat | cat &

[1] 16500

# cd /proc/16500/fd

# ls -l

lr-x------ root root 0 -> pipe:[931613]

lrwx------ root root 1 -> /dev/tty1

lrwx------ root root 2 -> /dev/tty1

# chown --dereference daemon 0

# ls -l

lr-x------ root root 0 -> pipe:[931613]

lrwx------ root root 1 -> /dev/tty1

lrwx------ root root 2 -> /dev/tty1

I also tried chown and chown -L. No go. I'm convinced this is simply impossible, but why? They clearly have inodes. That 931613 is the inode number.

In the case I am actually interested in, the process on the right would be running at lower privileges and I'd kind of like it to own its own handles so that it can re-open them.

pipe chown

share|improve this question

asked 6 hours ago

JoshuaJoshua

1,332816

add a comment | 

From a discussion on useless use of cat.

I decided to see if It was possible to avoid some of the troubles by changing the owner of the pipe. So I did:

# cat | cat &

[1] 16500

# cd /proc/16500/fd

# ls -l

lr-x------ root root 0 -> pipe:[931613]

lrwx------ root root 1 -> /dev/tty1

lrwx------ root root 2 -> /dev/tty1

# chown --dereference daemon 0

# ls -l

lr-x------ root root 0 -> pipe:[931613]

lrwx------ root root 1 -> /dev/tty1

lrwx------ root root 2 -> /dev/tty1

I also tried chown and chown -L. No go. I'm convinced this is simply impossible, but why? They clearly have inodes. That 931613 is the inode number.

In the case I am actually interested in, the process on the right would be running at lower privileges and I'd kind of like it to own its own handles so that it can re-open them.

pipe chown

share|improve this question

asked 6 hours ago

JoshuaJoshua

1,332816

# cat | cat &

[1] 16500

# cd /proc/16500/fd

# ls -l

lr-x------ root root 0 -> pipe:[931613]

lrwx------ root root 1 -> /dev/tty1

lrwx------ root root 2 -> /dev/tty1

# chown --dereference daemon 0

# ls -l

lr-x------ root root 0 -> pipe:[931613]

lrwx------ root root 1 -> /dev/tty1

lrwx------ root root 2 -> /dev/tty1

share|improve this question

asked 6 hours ago

JoshuaJoshua

1,332816

share|improve this question

asked 6 hours ago

JoshuaJoshua

1,332816

asked 6 hours ago

JoshuaJoshua

1,332816

asked 6 hours ago

JoshuaJoshua

1,332816

1 Answer
1

active

oldest

votes

0

Turns out I goofed up my ls command.

# ls -lL

lr-x------ daemon root 0 -> pipe:[931613]

lrwx------ root   root 1 -> /dev/tty1

lrwx------ root   root 2 -> /dev/tty1

share|improve this answer

answered 5 hours ago

JoshuaJoshua

1,332816

add a comment | 

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0

Turns out I goofed up my ls command.

# ls -lL

lr-x------ daemon root 0 -> pipe:[931613]

lrwx------ root   root 1 -> /dev/tty1

lrwx------ root   root 2 -> /dev/tty1

share|improve this answer

answered 5 hours ago

JoshuaJoshua

1,332816

add a comment | 

0

Turns out I goofed up my ls command.

# ls -lL

lr-x------ daemon root 0 -> pipe:[931613]

lrwx------ root   root 1 -> /dev/tty1

lrwx------ root   root 2 -> /dev/tty1

share|improve this answer

answered 5 hours ago

JoshuaJoshua

1,332816

add a comment | 

Turns out I goofed up my ls command.

# ls -lL

lr-x------ daemon root 0 -> pipe:[931613]

lrwx------ root   root 1 -> /dev/tty1

lrwx------ root   root 2 -> /dev/tty1

share|improve this answer

answered 5 hours ago

JoshuaJoshua

1,332816

# ls -lL

lr-x------ daemon root 0 -> pipe:[931613]

lrwx------ root   root 1 -> /dev/tty1

lrwx------ root   root 2 -> /dev/tty1

share|improve this answer

answered 5 hours ago

JoshuaJoshua

1,332816

answered 5 hours ago

JoshuaJoshua

1,332816

answered 5 hours ago

JoshuaJoshua

1,332816