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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/104964] Wrong *** buffer overflow detected
 ***: terminated - acl
Date: Thu, 24 Mar 2022 13:34:02 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104964

--- Comment #9 from Martin Li=C5=A1ka <marxin at gcc dot gnu.org> ---
You should see the difference in between -D_FORTIFY_SOURCE=3D2 and
-D_FORTIFY_SOURCE=3D3 in the attached pre-processed source files.

$ gcc fs2.i -c -O2 -Werror
$ gcc fs3.i -c -O2 -Werror
In file included from /usr/include/string.h:535,
                 from libacl/__acl_to_any_text.c:25:
In function =E2=80=98strcpy=E2=80=99,
    inlined from =E2=80=98__acl_to_any_text=E2=80=99 at libacl/__acl_to_any=
_text.c:90:3:
/usr/include/bits/string_fortified.h:79:10: error: =E2=80=98__builtin___str=
cpy_chk=E2=80=99
writing 1 or more bytes into a region of size 0 overflows the destination
[-Werror=3Dstringop-overflow=3D]
   79 |   return __builtin___strcpy_chk (__dest, __src, __glibc_objsize
(__dest));
      |=20=20=20=20=20=20=20=20=20
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20
cc1: all warnings being treated as errors

Note the warning exactly corresponds to the call that aborts during run-tim=
e.=