[Bug 4676] New: Can't use '#' in mdev.conf CMD

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=4676

           Summary: Can't use '#' in mdev.conf CMD
           Product: Busybox
           Version: 1.18.x
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: major
          Priority: P5
         Component: Other
        AssignedTo: unassigned at busybox.net
        ReportedBy: Nikolay.Yaroshevich at synesis.ru
                CC: busybox-cvs at busybox.net
   Estimated Hours: 0.0


Sample string from my mdev.conf:

dvb[0123]\..*                   0:0     660     @N=${MDEV%.*}; N=${N#dvb};
D=${MDEV#dvb?.}; mkdir -p dvb/adapter${N}; chmod 755 dvb dvb/adapter${N}; mv
MDEV dvb/adapter${N}/${D}

Executing that cmd on corresponding event causes error:
sh: syntax error: missing '}'

After some tracing it looks like '#' is treated as start of comment. 

in util-linux/mdev.c:
            if (ENABLE_FEATURE_MDEV_EXEC && command) {
                /* setenv will leak memory, use putenv/unsetenv/free */
                char *s = xasprintf("%s=%s", "MDEV", node_name);
                char *s1 = xasprintf("%s=%s", "SUBSYSTEM", G.subsystem);
                putenv(s);
                putenv(s1);
        ------> bb_error_msg("\n*** trying to exec '%s' ***\n", command);
                if (system(command) == -1)
                    bb_perror_msg("can't run '%s'", command);
                bb_unsetenv_and_free(s1);
                bb_unsetenv_and_free(s);
                free(command);
            }

Resulting output:

mdev: 
*** trying to exec 'N=${MDEV%.*}; N=${N' ***

sh: syntax error: missing '}'
mdev: 
*** trying to exec 'N=${MDEV%.*}; N=${N' ***

sh: syntax error: missing '}'

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