[lfs-book] [LFS Trac] #3258: Mounting /dev/shm can break some hosts

LFS Trac trac at linuxfromscratch.org
Thu Dec 20 13:24:28 PST 2012

#3258: Mounting /dev/shm can break some hosts
 Reporter:  matthew@…                     |       Owner:  lfs-book@…                   
     Type:  defect                        |      Status:  new                          
 Priority:  normal                        |   Milestone:  7.3                          
Component:  Book                          |     Version:  SVN                          
 Severity:  normal                        |    Keywords:                               

Comment(by bdubbs@…):

 I'm not sure about the change.  I agree that removing /dev/shm from the
 host is a problem, but does $(mkdir -p $/LFS/run/shm) within the chroot
 environment affect the host?  I suspect it normally does nothing as the
 item that the symlink points to is a directory so the -p in mkdir just
 exits, doing nothing.

 There could also be an issue of lack of isolation in the proposed change
 in that nothing is done if the symlink does exist.  Would just the line:

 mount -vt tmpfs shm $LFS/run/shm

 mount a new tmpfs over the old for use within chroot be better?

 AFAIR the only reason for /dev/shm to exist in chroot is to satisfy some
 tests in glibc.

Ticket URL: <http://wiki.linuxfromscratch.org/lfs/ticket/3258#comment:1>
LFS Trac <http://wiki.linuxfromscratch.org/lfs/>
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