[asterisk-bugs] [JIRA] (DAHLIN-387) DAHDI compilation gives "directive output may be truncated" error

[David Cunningham (JIRA)]

David Cunningham created DAHLIN-387:
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             Summary: DAHDI compilation gives "directive output may be truncated" error
                 Key: DAHLIN-387
                 URL: https://issues.asterisk.org/jira/browse/DAHLIN-387
             Project: DAHDI-Linux
          Issue Type: Bug
      Security Level: None
          Components: General
    Affects Versions: 3.1.0
         Environment: Ubuntu 18.04, kernel 4.15.0-142-generic
            Reporter: David Cunningham
            Assignee: Keith Morgan
            Severity: Major


DAHDI fails to compile on kernel 4.15.0-142-generic, with an error:

xusb_libusb.c: In function ‘xusb_find_bypath’:
xusb_libusb.c:500:41: error: ‘/’ directive output may be truncated writing 1 byte into a region of size between 0 and 4093 [-Werror=format-truncation=]
    snprintf(devpath_tail, PATH_MAX, "%3s/%3s",

The same problem happens with both DAHDI 3.1.0 and 3.0.0. The gcc compiler version is 7.5.0. The full compilation output is below. Thank you.

    root at ast1:/usr/src/dahdi-linux-complete-3.1.0+3.1.0# uname -r
    4.15.0-142-generic
    root at ast1:/usr/src/dahdi-linux-complete-3.1.0+3.1.0# make install-config
    make -C linux all
    make[1]: Entering directory '/usr/src/dahdi-linux-complete-3.1.0+3.1.0/linux'
    make -C drivers/dahdi/firmware firmware-loaders
    make[2]: Entering directory '/usr/src/dahdi-linux-complete-3.1.0+3.1.0/linux/drivers/dahdi/firmware'
    make[2]: Leaving directory '/usr/src/dahdi-linux-complete-3.1.0+3.1.0/linux/drivers/dahdi/firmware'
    make -C /lib/modules/4.15.0-142-generic/build KBUILD_EXTMOD=/usr/src/dahdi-linux-complete-3.1.0+3.1.0/linux/drivers/dahdi DAHDI_INCLUDE=/usr/src/dahdi-linux-complete-3.1.0+3.1.0/linux/include DAHDI_MODULES_EXTRA=" " HOTPLUG_FIRMWARE=yes modules DAHDI_BUILD_ALL=m
    make[2]: Entering directory '/usr/src/linux-headers-4.15.0-142-generic'
      Building modules, stage 2.
      MODPOST 28 modules
    WARNING: could not find /usr/src/dahdi-linux-complete-3.1.0+3.1.0/linux/drivers/dahdi/vpmadt032_loader/.vpmadt032_x86_64.o.cmd for /usr/src/dahdi-linux-complete-3.1.0+3.1.0/linux/drivers/dahdi/vpmadt032_loader/vpmadt032_x86_64.o
    make[2]: Leaving directory '/usr/src/linux-headers-4.15.0-142-generic'
    make[1]: Leaving directory '/usr/src/dahdi-linux-complete-3.1.0+3.1.0/linux'
    (cd tools && autoreconf -i && [ -f config.status ] || ./configure --with-dahdi=../linux)
    make -C tools all
    make[1]: Entering directory '/usr/src/dahdi-linux-complete-3.1.0+3.1.0/tools'
    make  all-recursive
    make[2]: Entering directory '/usr/src/dahdi-linux-complete-3.1.0+3.1.0/tools'
    Making all in xpp
    make[3]: Entering directory '/usr/src/dahdi-linux-complete-3.1.0+3.1.0/tools/xpp'
    Making all in perl_modules
    make[4]: Entering directory '/usr/src/dahdi-linux-complete-3.1.0+3.1.0/tools/xpp/perl_modules'
    make[4]: Nothing to be done for 'all'.
    make[4]: Leaving directory '/usr/src/dahdi-linux-complete-3.1.0+3.1.0/tools/xpp/perl_modules'
    Making all in oct612x
    make[4]: Entering directory '/usr/src/dahdi-linux-complete-3.1.0+3.1.0/tools/xpp/oct612x'
    make[4]: Nothing to be done for 'all'.
    make[4]: Leaving directory '/usr/src/dahdi-linux-complete-3.1.0+3.1.0/tools/xpp/oct612x'
    Making all in xtalk
    make[4]: Entering directory '/usr/src/dahdi-linux-complete-3.1.0+3.1.0/tools/xpp/xtalk'
      CC       libxtalk_la-xusb_libusb.lo
    xusb_libusb.c: In function ‘xusb_find_bypath’:
    xusb_libusb.c:500:41: error: ‘/’ directive output may be truncated writing 1 byte into a region of size between 0 and 4093 [-Werror=format-truncation=]
        snprintf(devpath_tail, PATH_MAX, "%3s/%3s",
                                             ^
    In file included from /usr/include/stdio.h:862:0,
                     from xusb_libusb.c:23:
    /usr/include/x86_64-linux-gnu/bits/stdio2.h:64:10: note: ‘__builtin___snprintf_chk’ output between 8 and 8194 bytes into a destination of size 4096
       return __builtin___snprintf_chk (__s, __n, __USE_FORTIFY_LEVEL - 1,
              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
            __bos (__s), __fmt, __va_arg_pack ());
            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    cc1: all warnings being treated as errors
    Makefile:658: recipe for target 'libxtalk_la-xusb_libusb.lo' failed
    make[4]: *** [libxtalk_la-xusb_libusb.lo] Error 1
    make[4]: Leaving directory '/usr/src/dahdi-linux-complete-3.1.0+3.1.0/tools/xpp/xtalk'
    Makefile:1043: recipe for target 'all-recursive' failed
    make[3]: *** [all-recursive] Error 1
    make[3]: Leaving directory '/usr/src/dahdi-linux-complete-3.1.0+3.1.0/tools/xpp'
    Makefile:1115: recipe for target 'all-recursive' failed
    make[2]: *** [all-recursive] Error 1
    make[2]: Leaving directory '/usr/src/dahdi-linux-complete-3.1.0+3.1.0/tools'
    Makefile:664: recipe for target 'all' failed
    make[1]: *** [all] Error 2
    make[1]: Leaving directory '/usr/src/dahdi-linux-complete-3.1.0+3.1.0/tools'
    Makefile:9: recipe for target 'all' failed
    make: *** [all] Error 2




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