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Re: Linux gnu m4 help


It appears to run and not dump core as best I can tell.

 m4  gm4_gdbinit.txt

The paths in the script are not valid for me though.

--joel

Peter Dufault wrote: 

On Feb 18, 2005, at 10:10 AM, Peter Dufault wrote:

It is a bug in m4. I tried the latest. On line 734, src/format.c of GNU m4 1.4.2 it is doing:

sprint(str, fstart, ...


While waiting and hoping that rtem 4.7 now builds for me, I'm trying to figure out why I'm seeing the stack overflow in M4 on FreeBSD during "bootstrap" and others are not on Linux and Cygwin.

Looking at m4 1.4.2 I see that the corruption is being detected by gm4's "src/stackovf.c", which is conditionally included during configuration, so maybe it isn't in use on Linux.

Could someone with Linux build GNU m4 1.4.2 with debugging and run the following GDB script against it in their rtems 4.7 source directory to see if the stack is corrupted but that it isn't being noticed? I've attached it as a ".txt" file to get past the censors.

Run as:
gdb gm4 -x gm4_gdbinit.txt
(or whatever GNU m4 1.4.2 with debugging is on your system)

On FreeBSD I get:

536       fmt = ARG_STR (argc, argv);
format (obs=0x80637e0, argc=1, argv=0x8124010) at format.c:727
727               if (width != -1 && prec != -1)
sizeof(str) is 256 and the format is "%-349s"
(gdb)

showing that the sprintf into str will corrupt the stack.


Thanks,

Peter

Peter Dufault
HD Associates, Inc.


------------------------------------------------------------------------

cd rtems-4.7/c/src/lib/libbsp/powerpc/dmv177
set args --nesting-limit=1024 --include=/usr/local/share/autoconf259 --debug=aflq --fatal-warning --error-output=autom4te.cache/traces.2t --trace=AC_CANONICAL_HOST --trace=AC_CANONICAL_SYSTEM --trace=AC_CHECK_FUNCS --trace=AC_CHECK_HEADERS --trace=AC_CHECK_LIB --trace=AC_CHECK_MEMBERS --trace=AC_CHECK_TYPES --trace=AC_CONFIG_AUX_DIR --trace=AC_CONFIG_FILES --trace=AC_CONFIG_HEADERS --trace=AC_CONFIG_LIBOBJ_DIR --trace=AC_CONFIG_LINKS --trace=AC_CONFIG_SUBDIRS --trace=AC_C_CONST --trace=AC_C_INLINE --trace=AC_C_VOLATILE --trace=AC_DECL_SYS_SIGLIST --trace=AC_DEFINE_TRACE_LITERAL --trace=AC_DEFUN --trace=AC_DEFUN_ONCE --trace=AC_FUNC_ALLOCA --trace=AC_FUNC_CHOWN --trace=AC_FUNC_CLOSEDIR_VOID --trace=AC_FUNC_ERROR_AT_LINE --trace=AC_FUNC_FORK --trace=AC_FUNC_FSEEKO --trace=AC_FUNC_GETGROUPS --trace=AC_FUNC_GETLOADAVG --trace=AC_FUNC_GETMNTENT --trace=AC_FUNC_GETPGRP --trace=AC_FUNC_LSTAT --trace=AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK --trace=AC_FUNC_MALLOC --trace=AC_FUNC_MBRTO

WC --trace=AC_FUNC_MEMCMP --trace=AC_FUNC_MKTIME --trace=AC_FUNC_MMAP --trace=AC_FUNC_OBSTACK --trace=AC_FUNC_REALLOC --trace=AC_FUNC_SELECT_ARGTYPES --trace=AC_FUNC_SETPGRP --trace=AC_FUNC_SETVBUF_REVERSED --trace=AC_FUNC_STAT --trace=AC_FUNC_STRCOLL --trace=AC_FUNC_STRERROR_R --trace=AC_FUNC_STRFTIME --trace=AC_FUNC_STRNLEN --trace=AC_FUNC_STRTOD --trace=AC_FUNC_UTIME_NULL --trace=AC_FUNC_VPRINTF --trace=AC_FUNC_WAIT3 --trace=AC_HEADER_DIRENT --trace=AC_HEADER_MAJOR --trace=AC_HEADER_STAT --trace=AC_HEADER_STDC --trace=AC_HEADER_SYS_WAIT --trace=AC_HEADER_TIME --trace=AC_INIT --trace=AC_LIBSOURCE --trace=AC_PATH_X --trace=AC_PROG_AWK --trace=AC_PROG_CC --trace=AC_PROG_CPP --trace=AC_PROG_CXX --trace=AC_PROG_GCC_TRADITIONAL --trace=AC_PROG_INSTALL --trace=AC_PROG_LEX --trace=AC_PROG_LIBTOOL --trace=AC_PROG_LN_S --trace=AC_PROG_MAKE_SET --trace=AC_PROG_RANLIB --trace=AC_PROG_YACC --trace=AC_REPLACE_FNMATCH --trace=AC_STRUCT_ST_BLOCKS --trace=AC_STRUCT_TIMEZONE --trace=AC_STRU
CT_TM --trace=AC_SUBST --trace=AC_TYPE_MODE_T --trace=AC_TYPE_OFF_T --trace=AC_TYPE_PID_T --trace=AC_TYPE_SIGNAL --trace=AC_TYPE_SIZE_T --trace=AC_TYPE_UID_T --trace=AH_OUTPUT --trace=AM_AUTOMAKE_VERSION --trace=AM_AUX_DIR_EXPAND --trace=AM_CONDITIONAL --trace=AM_DEP_TRACK --trace=AM_GNU_GETTEXT --trace=AM_INIT_AUTOMAKE --trace=AM_MAINTAINER_MODE --trace=AM_MAKE_INCLUDE --trace=AM_MISSING_HAS_RUN --trace=AM_MISSING_PROG --trace=AM_OUTPUT_DEPENDENCY_COMMANDS --trace=AM_PROG_CC_C_O --trace=AM_PROG_INSTALL_SH --trace=AM_PROG_INSTALL_STRIP --trace=AM_PROG_MKDIR_P --trace=AM_RUN_LOG --trace=AM_SANITY_CHECK --trace=AM_SET_CURRENT_AUTOMAKE_VERSION --trace=AM_SET_DEPDIR --trace=AM_SET_LEADING_DOT --trace=AU_DEFUN --trace=RTEMS_ARG_VAR --trace=RTEMS_BSPOPTS_HELP --trace=RTEMS_BSPOPTS_SET --trace=RTEMS_BSP_CONFIGURE --trace=RTEMS_CANONICALIZE_TOOLS --trace=RTEMS_CANONICAL_TARGET_CPU --trace=RTEMS_CHECK_CUSTOM_BSP --trace=RTEMS_CHECK_MULTIPROCESSING --trace=RTEMS_CHECK_NETWORKING --trac
e=RTEMS_CHECK_TOOL --trace=RTEMS_ENABLE_MULTILIB --trace=RTEMS_ENABLE_MULTIPROCESSING --trace=RTEMS_ENABLE_NETWORKING --trace=RTEMS_ENABLE_RTEMSBSP --trace=RTEMS_ENV_RTEMSBSP --trace=RTEMS_GCC_ISYSTEM --trace=RTEMS_GCC_PIPE --trace=RTEMS_GCC_SPECS --trace=RTEMS_PPC_EXCEPTIONS --trace=RTEMS_PROG_CC --trace=RTEMS_PROG_CCAS --trace=RTEMS_PROG_CC_FOR_TARGET --trace=RTEMS_PROJECT_ROOT --trace=RTEMS_TOP --trace=RTEMS_VERSIONING --trace=_AC_AM_CONFIG_HEADER_HOOK --trace=_AM_DEPENDENCIES --trace=_AM_IF_OPTION --trace=_AM_MANGLE_OPTION --trace=_AM_OUTPUT_DEPENDENCY_COMMANDS --trace=_AM_PROG_TAR --trace=_AM_SET_OPTION --trace=_AM_SET_OPTIONS --trace=_RTEMS_CHECK_CUSTOM_BSP --trace=_m4_warn --trace=include --trace=jm_MAINTAINER_MODE --trace=m4_include --trace=m4_pattern_allow --trace=m4_pattern_forbid --trace=m4_sinclude --reload-state=/usr/local/share/autoconf259/autoconf/autoconf.m4f /usr/local/share/aclocal19/amversion.m4 /usr/local/share/aclocal19/auxdir.m4 /usr/local/share/aclocal1
9/cond.m4 /usr/local/share/aclocal19/depend.m4 /usr/local/share/aclocal19/depout.m4 /usr/local/share/aclocal19/init.m4 /usr/local/share/aclocal19/install-sh.m4 /usr/local/share/aclocal19/lead-dot.m4 /usr/local/share/aclocal19/maintainer.m4 /usr/local/share/aclocal19/make.m4 /usr/local/share/aclocal19/missing.m4 /usr/local/share/aclocal19/mkdirp.m4 /usr/local/share/aclocal19/options.m4 /usr/local/share/aclocal19/runlog.m4 /usr/local/share/aclocal19/sanity.m4 /usr/local/share/aclocal19/strip.m4 /usr/local/share/aclocal19/tar.m4 ../../../../aclocal/bsp-configure.m4 ../../../../aclocal/bspopts.m4 ../../../../aclocal/canonical-target-name.m4 ../../../../aclocal/canonicalize-tools.m4 ../../../../aclocal/check-custom-bsp.m4 ../../../../aclocal/check-multiprocessing.m4 ../../../../aclocal/check-networking.m4 ../../../../aclocal/check-tool.m4 ../../../../aclocal/enable-multiprocessing.m4 ../../../../aclocal/enable-networking.m4 ../../../../aclocal/enable-rtemsbsp.m4 ../../../../acloca
l/env-rtemsbsp.m4 ../../../../aclocal/gcc-isystem.m4 ../../../../aclocal/gcc-pipe.m4 ../../../../aclocal/gcc-specs.m4 ../../../../aclocal/multilib.m4 ../../../../aclocal/ppc.m4 ../../../../aclocal/prog-cc.m4 ../../../../aclocal/prog-ccas.m4 ../../../../aclocal/project-root.m4 ../../../../aclocal/rtems-top.m4 ../../../../aclocal/version.m4 configure.ac

break format
ignore 1 13
run
until 727
printf "sizeof(str) is %d and the format is \"%s\"\n", sizeof(str), fstart


------------------------------------------------------------------------




--
Joel Sherrill, Ph.D.             Director of Research & Development
joel@OARcorp.com                 On-Line Applications Research
Ask me about RTEMS: a free RTOS  Huntsville AL 35805
   Support Available             (256) 722-9985