* Why do Zombie process' /proc entries have uid 0?
@ 2016-12-23 6:19 Keno Fischer
0 siblings, 0 replies; only message in thread
From: Keno Fischer @ 2016-12-23 6:19 UTC (permalink / raw)
To: linux-kernel
This is mostly out of curiosity, but I was surprised by the behavior, so
I was hoping somebody might be able to explain why this behavior was
chosen. In particular, consider any zombie process, e.g.
$ cat /proc/77078/status
Name: test
State: Z (zombie)
Tgid: 77078
Ngid: 0
Pid: 77078
PPid: 77077
TracerPid: 0
Uid: 1000 1000 1000 1000
Gid: 1000 1000 1000 1000
[...]
now, this process has uid 1000, as does the /proc/<pid> directory
$ stat /proc/77078
File: '/proc/77078'
Access: (0555/dr-xr-xr-x) Uid: ( 1000/ keno) Gid: ( 1000/ keno)
but most files in /proc/<pid> are owned by root:
$ stat /proc/77078/status
File: '/proc/77078/status'
Access: (0444/-r--r--r--) Uid: ( 0/ root) Gid: ( 0/ root)
Why is this? Why don't these files remain owned by the same uid as the
process itself?
Keno
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2016-12-23 6:19 Why do Zombie process' /proc entries have uid 0? Keno Fischer
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