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CP

Member

Registered: 2012-12-13

Posts: 5

Cannot run tmux as non-root user.

I'm not certain if this is the correct section for this.

I have a cloud server that I recently created that doesn't have a swap partition.  I migrated the home directory for this user from another server to this new server.  The appropriate permissions are set.

I attempted to strace this to look at the system calls for this when running it.

strace -fs 4000 -o strace.txt tmux.

I'm abridging some of this.  These are part of the last 50 lines.

5758  close(10)                         = 0
5758  close(9)                          = 0
5758  clock_gettime(CLOCK_MONOTONIC, {...}) = 0
5758  gettimeofday({...}, NULL)         = 0
5758  clock_gettime(CLOCK_MONOTONIC, {...}) = 0
5758  gettimeofday({...}, NULL)         = 0
5758  poll([?] 0x1c33820, 4, 995)       = 2
5758  clock_gettime(CLOCK_MONOTONIC, {...}) = 0
5758  gettimeofday({...}, NULL)         = 0
5758  writev(8, [?] 0x7ffffe287c80, 1)  = 73
5758  sendmsg(7, 0x7ffffe284460, 0)     = 8236
5758  clock_gettime(CLOCK_MONOTONIC, {...}) = 0
5758  gettimeofday({...}, NULL)         = 0
5758  clock_gettime(CLOCK_MONOTONIC, {...}) = 0
5758  gettimeofday({...}, NULL)         = 0
5758  poll([?] 0x1c33820, 4, 994 <unfinished ...>
5756  <... poll resumed> )              = 1 ([{fd=6, revents=POLLIN}])
5756  clock_gettime(CLOCK_MONOTONIC, {521260, 588392101}) = 0
5756  gettimeofday({1384888944, 278223}, NULL) = 0
5756  recvmsg(6, {msg_name(0)=NULL, msg_iov(1)=[{"\323\0\0\0\30 \0\0\10\0\0\0\377\377\377\3771\0\0\0\0\0\0\0create session failed: : Operation not permitted\n\fi\200v\177\0\0\36\0\0\0\0\0\0\0\1\0\0\0\0\0\0\0\300\247\301\1\0\0\0\0\2701\303\1\0\0\0\0\300\247\301\1\0\0\0\0P\3146\200v\177\0\0@\5\304\1\0\0\0\0\260](\376\377\177\0\0000M(\376\377\177\0\0 \1\304\1\0\0\0\0 \1\304\1\0\0\0\0@\5\304\1\0\0\0\0\260L(\376\377\177\0\0A\334A\0\0\0\0\0"..., 65535}], msg_controllen=0, msg_flags=0}, 0) = 8236
5756  write(2, "create session failed: : Operation not permitted\n", 49) = 49
5756  poll([{fd=4, events=POLLIN}], 1, 0) = 0 (Timeout)
5756  clock_gettime(CLOCK_MONOTONIC, {521260, 588816739}) = 0
5756  gettimeofday({1384888944, 278647}, NULL) = 0
5756  fcntl(0, F_GETFL)                 = 0x8c02 (flags O_RDWR|O_APPEND|O_NONBLOCK|O_LARGEFILE)
5756  fcntl(0, F_SETFL, O_RDWR|O_APPEND|O_LARGEFILE) = 0
5756  exit_group(1)                     = ?
5758  <... poll resumed> )              = 1
5758  clock_gettime(CLOCK_MONOTONIC, {...}) = 0
5758  gettimeofday({...}, NULL)         = 0
5758  recvmsg(7, 0x7ffffe2863a0, 0)     = 0
5758  ioctl(8, TIOCGWINSZ, 0x7ffffe288450) = 0
5758  ioctl(8, SNDCTL_TMR_START or SNDRV_TIMER_IOCTL_TREAD or TCSETS, 0x7ffffe288400) = 0
5758  write(8, 0x1c412a0, 7)            = 7
5758  write(8, 0x1c3d340, 3)            = 3
5758  write(8, 0x1c3d440, 6)            = 6
5758  write(8, 0x1c3d380, 7)            = 7
5758  write(8, 0x1c38ca0, 7)            = 7
5758  write(8, 0x1c3d610, 6)            = 6
5758  write(8, 0x1c38cc0, 12)           = 12
5758  write(8, 0x46c5dc, 24)            = 24
5758  write(8, 0x1c3d360, 8)            = 8
5758  fcntl(8, F_GETFL)                 = 0x8402 (flags O_RDWR|O_APPEND|O_LARGEFILE)
5758  fcntl(8, F_SETFL, O_RDWR|O_APPEND|O_LARGEFILE) = 0
5758  close(8)                          = 0
5758  close(5)                          = 0
5758  close(7)                          = 0
5758  exit_group(0)                     = ?
5758  +++ exited with 0 +++
5756  +++ exited with 1 +++

So I see that a write on a certain file was supposed to happen but it failed due to the operation not being permitted.  I speculated that the tmp folder for that tmux session for that user may have not had the correct permissions.

drwx------  2 sword sword   60 Nov 19 19:22 tmux-1000/

I was incorrect about that.  Is there something else I'm missing here?

alphaniner

Member

From: Ancapistan

Registered: 2010-07-12

Posts: 2,810

Re: Cannot run tmux as non-root user.

Is this relevant?

---

But whether the Constitution really be one thing, or another, this much is certain - that it has either authorized such a government as we have had, or has been powerless to prevent it. In either case, it is unfit to exist.
-Lysander Spooner

CP

Member

Registered: 2012-12-13

Posts: 5

Re: Cannot run tmux as non-root user.

Is this relevant?

Yes.  That worked actually.  Thanks.  Solved.