[OpenWrt-Devel] [PATCH procd] move /dev/shm to /tmp/shm

[Daniel Gimpelevich]

OpenSSL session caches create shared memory segments that appear as
files under /dev/shm. If there is not enough room there, execution
terminates with SIGBUS upon access. Even a single instance would exceed
512K.

On Tue, 2015-07-14 at 11:50 +0200, John Crispin wrote:
> what kind of usage do you expect ?
> 
> On 11/07/2015 03:58, Daniel Gimpelevich wrote:
> > Since the /dev filesystem is tiny, /dev/shm needs to live somewhere
> > else.
> > 
> > Signed-off-by: Daniel Gimpelevich <daniel at gimpelevich.san-francisco.ca.us>
> > --- a/initd/early.c	2015-06-19 14:01:25.000000000 -0700
> > +++ b/initd/early.c	2015-07-10 15:04:23.270143065 -0700
> > @@ -66,16 +66,20 @@
> >  	mount("sysfs", "/sys", "sysfs", MS_NOATIME, 0);
> >  	mount("none", "/sys/fs/cgroup", "cgroup", 0, 0);
> >  	mount("tmpfs", "/dev", "tmpfs", MS_NOATIME, "mode=0755,size=512K");
> > -	mkdir("/dev/shm", 01777);
> > +	symlink("/tmp/shm", "/dev/shm");
> >  	mkdir("/dev/pts", 0755);
> >  	mount("devpts", "/dev/pts", "devpts", MS_NOATIME, "mode=600");
> >  	early_dev();
> >  
> >  	early_console("/dev/console");
> > -	if (mount_zram_on_tmp())
> > +	if (mount_zram_on_tmp()) {
> >  		mount("tmpfs", "/tmp", "tmpfs", MS_NOSUID | MS_NODEV | MS_NOATIME, NULL);
> > -	else
> > -		mkdev("*", 0600);
> > +		mkdir("/tmp/shm", 01777);
> > +	} else {
> > +		mkdir("/tmp/shm", 01777);
> > +		mount("tmpfs", "/tmp/shm", "tmpfs", MS_NOSUID | MS_NODEV | MS_NOATIME,
> > +				"mode=01777");
> > +	}
> >  	mkdir("/tmp/run", 0777);
> >  	mkdir("/tmp/lock", 0777);
> >  	mkdir("/tmp/state", 0777);
> > --- a/plug/coldplug.c	2015-06-19 14:01:25.000000000 -0700
> > +++ b/plug/coldplug.c	2015-07-10 15:04:19.270123233 -0700
> > @@ -45,7 +45,7 @@
> >  	umount2("/dev/pts", MNT_DETACH);
> >  	umount2("/dev/", MNT_DETACH);
> >  	mount("tmpfs", "/dev", "tmpfs", 0, "mode=0755,size=512K");
> > -	mkdir("/dev/shm", 01777);
> > +	symlink("/tmp/shm", "/dev/shm");
> >  	mkdir("/dev/pts", 0755);
> >  	umask(oldumask);
> >  	mount("devpts", "/dev/pts", "devpts", 0, 0);
> > _______________________________________________
> > openwrt-devel mailing list
> > openwrt-devel at lists.openwrt.org
> > https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-devel
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