linprocfs: Add support for proc/sysvipc/{msg,sem,shm} v2

[ricardobranco777]

Add support for proc/sysvipc/{msg,sem,shm}

Tracking in https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=278812

Retry of #1218

[bsdimp]

This is dependent on kib's changes to export this data.

[ricardobranco777]

https://reviews.freebsd.org/D45175

[kostikbel]

So you did not updated the PR to use the new functions. I want to commit my change after it is verified somehow.

[ricardobranco777]

So you did not updated the PR to use the new functions. I want to commit my change after it is verified somehow.

Wouldn't it be easier to test by also patching the sysctl function called by ipcs?

Will test your changes and report back.

[kostikbel]

So you did not updated the PR to use the new functions. I want to commit my change after it is verified somehow.

Wouldn't it be easier to test by also patching the sysctl function called by ipcs?
No, the functions I provided are bad fit for the sysctls. They do not handle COMPAT32, they allocate large chunk of memory which is not needed for sysctl.

Will test your changes and report back.
I will commit my bits after your confirmation.

[ricardobranco777]

I will commit my bits after your confirmation.

It works for SHM. I can see the same information in 32 & 64-bits Linux chroot. It works both for /proc/sysvshm/shm & ipcs. But I can't see MSG & SEM, even after I changed security.bsd.see_other_uids, security.bsd.see_other_gids & security.bsd.see_jail_proc to 1.

$ sudo chroot /compat/ubuntu32 ipcs -a

------ Message Queues --------
key        msqid      owner      perms      used-bytes   messages    

------ Shared Memory Segments --------
key        shmid      owner      perms      bytes      nattch     status      
0xd7dda8b0 65536      1000       644        4096       0                       

------ Semaphore Arrays --------
key        semid      owner      perms      nsems     

$ sudo chroot /compat/ubuntu32 cat /proc/sysvipc/shm
       key      shmid perms                  size  cpid  lpid nattch   uid   gid  cuid  cgid      atime      dtime      ctime                   rss                  swap
-673339216      65536  4644                  4096 43204     0      0  1000  1000  1000  1000 0 0 1715879396      

$ sudo chroot /compat/ubuntu cat /proc/sysvipc/shm
       key      shmid perms                  size  cpid  lpid nattch   uid   gid  cuid  cgid      atime      dtime      ctime                   rss                  swap
-673339216      65536  4644                  4096 43204     0      0  1000  1000  1000  1000 0 0 1715879396                     0                     0

$ ipcs -a
Message Queues:
T           ID          KEY MODE        OWNER    GROUP    CREATOR  CGROUP                 CBYTES                 QNUM               QBYTES        LSPID        LRPID STIME    RTIME    CTIME   
q        65536    909169119 --rw-r--r-- ricardo  ricardo  ricardo  ricardo             0            0                 2048            0            0 no-entry no-entry 19:09:56

Shared Memory:
T           ID          KEY MODE        OWNER    GROUP    CREATOR  CGROUP         NATTCH        SEGSZ         CPID         LPID ATIME    DTIME    CTIME   
m        65536   -673339216 --rw-r--r-- ricardo  ricardo  ricardo  ricardo             0         4096        43204            0 no-entry no-entry 19:09:56

Semaphores:
T           ID          KEY MODE        OWNER    GROUP    CREATOR  CGROUP          NSEMS OTIME    CTIME   
s        65536  -1803737408 --rw-r--r-- ricardo  ricardo  ricardo  ricardo             1 no-entry 19:09:56