root permission denied on /proc/1/exe
It appears that you did not run lsof
as root, given that you show a prompt with $
. Run sudo lsof
to execute the lsof
command as root.
Some information about a process, such as its current directory (pwd
), its root directory (root
), the location of its executable (exe
) and its file descriptors (fd
) can only be viewed by the user running the process (or root). That's normal behavior. Sometimes the permission to access files in /proc
doesn't match the permission in the directory entries, it's finer-grained (for example, it depends on processes' effective UID as well as real UID).
You might get “permission denied” as root in some unusual circumstances, when you're root only in a namespace. If you just installed a new machine, you won't be seeing this.
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Andy
Updated on September 18, 2022Comments
-
Andy over 1 year
I just performed a fresh ubuntu install and i am seeing the following in lsof:
userA@az1:~$ lsof COMMAND PID TID USER FD TYPE DEVICE SIZE/OFF NODE NAME init 1 root cwd unknown /proc/1/cwd (readlink: Permission denied) init 1 root rtd unknown /proc/1/root (readlink: Permission denied) init 1 root txt unknown /proc/1/exe (readlink: Permission denied) init 1 root NOFD /proc/1/fd (opendir: Permission denied) kthreadd 2 root cwd unknown /proc/2/cwd (readlink: Permission denied) kthreadd 2 root rtd unknown /proc/2/root (readlink: Permission denied) kthreadd 2 root txt unknown /proc/2/exe (readlink: Permission denied) kthreadd 2 root NOFD /proc/2/fd (opendir: Permission denied)
Is this normal? If not how do I fix it? Trying to search for this particular error has lead me nowhere.
I am concerned that something is wrong because root is getting
Permission denied
errors.ls -la result for the proc folder:
dr-xr-xr-x 145 root root 0 Jan 13 17:33 proc
ls -la results for contents are:
dr-xr-xr-x 9 root root 0 Jan 13 17:34 1
and for the contents of process 1.
sudo ls -la /proc/1/ total 0 dr-xr-xr-x 9 root root 0 Jan 13 17:34 . dr-xr-xr-x 145 root root 0 Jan 13 17:33 .. dr-xr-xr-x 2 root root 0 Jan 13 17:42 attr -rw-r--r-- 1 root root 0 Jan 13 17:42 autogroup -r-------- 1 root root 0 Jan 13 17:42 auxv -r--r--r-- 1 root root 0 Jan 13 17:34 cgroup --w------- 1 root root 0 Jan 13 17:42 clear_refs -r--r--r-- 1 root root 0 Jan 13 17:34 cmdline -rw-r--r-- 1 root root 0 Jan 13 17:42 comm -rw-r--r-- 1 root root 0 Jan 13 17:42 coredump_filter -r--r--r-- 1 root root 0 Jan 13 17:42 cpuset lrwxrwxrwx 1 root root 0 Jan 13 17:35 cwd -r-------- 1 root root 0 Jan 13 17:35 environ lrwxrwxrwx 1 root root 0 Jan 13 17:34 exe dr-x------ 2 root root 0 Jan 13 17:35 fd dr-x------ 2 root root 0 Jan 13 17:42 fdinfo -r-------- 1 root root 0 Jan 13 17:42 io -r--r--r-- 1 root root 0 Jan 13 17:42 latency -r--r--r-- 1 root root 0 Jan 13 17:35 limits -rw-r--r-- 1 root root 0 Jan 13 17:42 loginuid dr-x------ 2 root root 0 Jan 13 17:42 map_files -r--r--r-- 1 root root 0 Jan 13 17:35 maps -rw------- 1 root root 0 Jan 13 17:42 mem -r--r--r-- 1 root root 0 Jan 13 17:42 mountinfo -r--r--r-- 1 root root 0 Jan 13 17:42 mounts -r-------- 1 root root 0 Jan 13 17:42 mountstats dr-xr-xr-x 5 root root 0 Jan 13 17:42 net dr-x--x--x 2 root root 0 Jan 13 17:42 ns -r--r--r-- 1 root root 0 Jan 13 17:42 numa_maps -rw-r--r-- 1 root root 0 Jan 13 17:42 oom_adj -r--r--r-- 1 root root 0 Jan 13 17:42 oom_score -rw-r--r-- 1 root root 0 Jan 13 17:42 oom_score_adj -r--r--r-- 1 root root 0 Jan 13 17:42 pagemap -r--r--r-- 1 root root 0 Jan 13 17:42 personality lrwxrwxrwx 1 root root 0 Jan 13 17:35 root -rw-r--r-- 1 root root 0 Jan 13 17:42 sched -r--r--r-- 1 root root 0 Jan 13 17:42 schedstat -r--r--r-- 1 root root 0 Jan 13 17:42 sessionid -r--r--r-- 1 root root 0 Jan 13 17:42 smaps -r--r--r-- 1 root root 0 Jan 13 17:42 stack -r--r--r-- 1 root root 0 Jan 13 17:35 stat -r--r--r-- 1 root root 0 Jan 13 17:42 statm -r--r--r-- 1 root root 0 Jan 13 17:35 status -r--r--r-- 1 root root 0 Jan 13 17:42 syscall dr-xr-xr-x 3 root root 0 Jan 13 17:35 task -r--r--r-- 1 root root 0 Jan 13 17:42 timers -r--r--r-- 1 root root 0 Jan 13 17:42 wchan