[ast-developers] Hint from $ clang -fsanitize=address ... # why "nmake" sometimes goes boom (because of |strcpy()| overlap) ...

Roland Mainz

2013-08-11 02:49:11 UTC

Hi!

----

An attempt to build ast-open.2013-08-07 on SuSE 12.3/AMD64/64bit with
"clang"'s address sanitiser came back with a hint why "nnake"
sometimes goes "boom" or somehow generates corrupted data:
-- snip --
$ (export CC='/usr/bin/clang -std=gnu1x -fsanitize=address -g
-fno-omit-frame-pointer -fno-optimize-sibling-calls -Wno-parentheses
-Wno-logical-op-parentheses -Wno-unused' LD="$CC" CCFLAGS="-g"; ksh
./bin/package make PACKAGE_OPTIONS='map-libc' CC="$CC"
CCFLAGS="$CCFLAGS" 2>&1 | tee -a buildlog.log)
[snip]
package: believe generated files for nmake
CC=cc
SHELL=/usr/bin/ksh
HOSTTYPE=linux.i386-64
NPROC=2
PACKAGEROOT=/home/test001/work/ast_ksh_20130807/build_clang
INSTALLROOT=/home/test001/work/ast_ksh_20130807/build_clang/arch/linux.i386-64
PATH=/home/test001/work/ast_ksh_20130807/build_clang/arch/linux.i386-64/bin:/home/test001/work/ast_ksh_20130807/build_clang/bin:/usr/lib64/mpi/gcc/openmpi/bin:/home/test001/bin:/u
sr/local/bin:/usr/bin:/bin:/usr/bin/X11:/usr/X11R6/bin:/usr/games:/usr/lib/mit/bin:/usr/lib/mit/sbin
probing C language processor
/home/test001/work/ast_ksh_20130807/build_clang/arch/linux.i386-64/bin/cc
for make information
cmd/INIT:
=================================================================
==50399==ERROR: AddressSanitizer: strcpy-param-overlap: memory ranges
[0x7f796eb74eb0,0x7f796eb74ece) and [0x7f796eb74eb0, 0x7f796eb74ece)
overlap
#0 0x41e4aa
(/home/test001/work/ast_ksh_20130807/build_clang/arch/linux.i386-64/bin/nmake+0x41e4aa)
#1 0x6e4352
(/home/test001/work/ast_ksh_20130807/build_clang/arch/linux.i386-64/bin/nmake+0x6e4352)
#2 0x6e13fc
(/home/test001/work/ast_ksh_20130807/build_clang/arch/linux.i386-64/bin/nmake+0x6e13fc)
#3 0x614a13
(/home/test001/work/ast_ksh_20130807/build_clang/arch/linux.i386-64/bin/nmake+0x614a13)
#4 0x5f19ed
(/home/test001/work/ast_ksh_20130807/build_clang/arch/linux.i386-64/bin/nmake+0x5f19ed)
#5 0x46e48d
(/home/test001/work/ast_ksh_20130807/build_clang/arch/linux.i386-64/bin/nmake+0x46e48d)
#6 0x601323
(/home/test001/work/ast_ksh_20130807/build_clang/arch/linux.i386-64/bin/nmake+0x601323)
#7 0x5f1905
(/home/test001/work/ast_ksh_20130807/build_clang/arch/linux.i386-64/bin/nmake+0x5f1905)
#8 0x648dd0
(/home/test001/work/ast_ksh_20130807/build_clang/arch/linux.i386-64/bin/nmake+0x648dd0)
#9 0x63f322
(/home/test001/work/ast_ksh_20130807/build_clang/arch/linux.i386-64/bin/nmake+0x63f322)
#10 0x5343a9
(/home/test001/work/ast_ksh_20130807/build_clang/arch/linux.i386-64/bin/nmake+0x5343a9)
#11 0x7f796de3fa14 (/lib64/libc-2.17.so+0x21a14)
#12 0x42e94c
(/home/test001/work/ast_ksh_20130807/build_clang/arch/linux.i386-64/bin/nmake+0x42e94c)
==50399==ABORTING
make: *** exit code 1 making cmd/INIT
-- snip --
... this happens because |strcpy()| is called with overlapping memory
areas (which isn't valid in ISO C because the results are undefined).
I don't have a better stack trace yet... I still have to figure out
how to get to that with "clang"'s address santitiser

-----

Bye,
Roland

--
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