get uid from pid(process id) from kernel level code

Question

I would like to get uid of a pid. Please note that the uid that I want to get is NOT of the current process. Please let me know if you have an idea. Maybe can I get it by reuse the function of /proc/[pid]/status read function in kernel? //Bruce

Tsyvarev · Answer 1 · 2016-09-26T07:27:28.187

2

Search process descriptor (struct task_struct) with given pid.
Use task->cred->uid.

Struct struct task_struct is defined in include/linux/sched.h. Struct struct cred is defined in include/linux/cred.h.

Note, that iterating through processes and reading process's credentials should be done under RCU-critical section.

edited Sep 26 '16 at 07:27

answered Nov 23 '15 at 07:20

Tsyvarev

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doesn't `gid` refers to `group id` ? – bawejakunal Sep 24 '16 at 23:39
Looks like it was misprint. Now it is fixed. Thanks for pointing out. – Tsyvarev Sep 26 '16 at 07:28

get uid from pid(process id) from kernel level code

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