https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81938
Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2017-08-30
Ever confirmed|0 |1
--- Comment #1 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
An instrumented gfortran gives at run time
==59185==ERROR: AddressSanitizer: heap-buffer-overflow on address
0x621000001150 at pc 0x00010b132896 bp 0x7fff554f6020 sp 0x7fff554f6018
READ of size 4 at 0x621000001150 thread T0
#0 0x10b132895 in _gfortrani_free_format_data
(/opt/gcc/gcc8g/lib/libgfortran.4.dylib+0xa21895)
#1 0x10b132a46 in _gfortrani_free_format_hash_table
(/opt/gcc/gcc8g/lib/libgfortran.4.dylib+0xa21a46)
#2 0x10b1ae7a9 in close_unit_1
(/opt/gcc/gcc8g/lib/libgfortran.4.dylib+0xa9d7a9)
#3 0x10b1ae9bf in _gfortrani_close_unit
(/opt/gcc/gcc8g/lib/libgfortran.4.dylib+0xa9d9bf)
#4 0x10b123fc7 in _gfortran_st_close
(/opt/gcc/gcc8g/lib/libgfortran.4.dylib+0xa12fc7)
#5 0x10a709ba1 in MAIN__
(/Users/dominiq/Documents/Fortran/g95bench/win/f90/bug/a.out+0x100000ba1)
#6 0x10a709bda in main
(/Users/dominiq/Documents/Fortran/g95bench/win/f90/bug/a.out+0x100000bda)
#7 0x7fffbcb65234 in start (/usr/lib/system/libdyld.dylib+0x5234)
0x621000001150 is located 0 bytes to the right of 4176-byte region
[0x621000000100,0x621000001150)
allocated by thread T0 here:
#0 0x10cffb1da in wrap_malloc (/opt/gcc/gcc8w/lib/libasan.4.dylib+0x661da)
#1 0x10a714427 (/opt/gcc/gcc8g/lib/libgfortran.4.dylib+0x3427)
#2 0x10b13407f in _gfortrani_parse_format
(/opt/gcc/gcc8g/lib/libgfortran.4.dylib+0xa2307f)
#3 0x10b19c279 in data_transfer_init
(/opt/gcc/gcc8g/lib/libgfortran.4.dylib+0xa8b279)
#4 0x10b1a17d0 in _gfortran_st_write
(/opt/gcc/gcc8g/lib/libgfortran.4.dylib+0xa907d0)
#5 0x10a7098e0 in MAIN__
(/Users/dominiq/Documents/Fortran/g95bench/win/f90/bug/a.out+0x1000008e0)
#6 0x10a709bda in main
(/Users/dominiq/Documents/Fortran/g95bench/win/f90/bug/a.out+0x100000bda)
#7 0x7fffbcb65234 in start (/usr/lib/system/libdyld.dylib+0x5234)
SUMMARY: AddressSanitizer: heap-buffer-overflow
(/opt/gcc/gcc8g/lib/libgfortran.4.dylib+0xa21895) in
_gfortrani_free_format_data
Shadow bytes around the buggy address:
0x1c42000001d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x1c42000001e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x1c42000001f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x1c4200000200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x1c4200000210: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x1c4200000220: 00 00 00 00 00 00 00 00 00 00[fa]fa fa fa fa fa
0x1c4200000230: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x1c4200000240: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x1c4200000250: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x1c4200000260: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x1c4200000270: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
Shadow byte legend (one shadow byte represents 8 application bytes):
Addressable: 00
Partially addressable: 01 02 03 04 05 06 07
Heap left redzone: fa
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack after return: f5
Stack use after scope: f8
Global redzone: f9
Global init order: f6
Poisoned by user: f7
Container overflow: fc
Array cookie: ac
Intra object redzone: bb
ASan internal: fe
Left alloca redzone: ca
Right alloca redzone: cb
==59185==ABORTING
Program received signal SIGABRT: Process abort signal.
Also present in gcc7.
