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bpo-28503: _crypt: fix implicit declaration of crypt(), use crypt_r() if available. #4691

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bpo-28503: _crypt: fix implicit declaration of crypt(), use crypt_r() if available. #4691

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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Library/2017-12-03-21-25-10.bpo-28503.D93bf3.rst
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@@ -0,0 +1 @@
Let the `_crypt` module use `crypt_r()` when available for thread safety.
11 changes: 11 additions & 0 deletions Modules/_cryptmodule.c
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Expand Up @@ -5,6 +5,11 @@

#include <sys/types.h>

#ifdef HAVE_CRYPT_H
#include <crypt.h>
#endif
#include <unistd.h>

/* Module crypt */

/*[clinic input]
Expand Down Expand Up @@ -34,7 +39,13 @@ static PyObject *
crypt_crypt_impl(PyObject *module, const char *word, const char *salt)
/*[clinic end generated code: output=0512284a03d2803c input=0e8edec9c364352b]*/
{
#ifdef HAVE_CRYPT_R
struct crypt_data data;
data.initialized = 0;
return Py_BuildValue("s", crypt_r(word, salt, &data));
#else
return Py_BuildValue("s", crypt(word, salt));
#endif
}


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51 changes: 48 additions & 3 deletions configure
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Expand Up @@ -7681,7 +7681,7 @@ $as_echo "#define STDC_HEADERS 1" >>confdefs.h

fi

for ac_header in asm/types.h conio.h direct.h dlfcn.h errno.h \
for ac_header in asm/types.h conio.h crypt.h direct.h dlfcn.h errno.h \
fcntl.h grp.h \
ieeefp.h io.h langinfo.h libintl.h process.h pthread.h \
sched.h shadow.h signal.h stropts.h termios.h \
Expand Down Expand Up @@ -9502,6 +9502,51 @@ _ACEOF

fi
# Dynamic linking for HP-UX
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for crypt in -lcrypt" >&5
$as_echo_n "checking for crypt in -lcrypt... " >&6; }
if ${ac_cv_lib_crypt_crypt+:} false; then :
$as_echo_n "(cached) " >&6
else
ac_check_lib_save_LIBS=$LIBS
LIBS="-lcrypt $LIBS"
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */

/* Override any GCC internal prototype to avoid an error.
Use char because int might match the return type of a GCC
builtin and then its argument prototype would still apply. */
#ifdef __cplusplus
extern "C"
#endif
char crypt ();
int
main ()
{
return crypt ();
;
return 0;
}
_ACEOF
if ac_fn_c_try_link "$LINENO"; then :
ac_cv_lib_crypt_crypt=yes
else
ac_cv_lib_crypt_crypt=no
fi
rm -f core conftest.err conftest.$ac_objext \
conftest$ac_exeext conftest.$ac_ext
LIBS=$ac_check_lib_save_LIBS
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_crypt_crypt" >&5
$as_echo "$ac_cv_lib_crypt_crypt" >&6; }
if test "x$ac_cv_lib_crypt_crypt" = xyes; then :
cat >>confdefs.h <<_ACEOF
#define HAVE_LIBCRYPT 1
_ACEOF

LIBS="-lcrypt $LIBS"

fi
# crypt() on Linux

{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for uuid_generate_time_safe" >&5
$as_echo_n "checking for uuid_generate_time_safe... " >&6; }
Expand Down Expand Up @@ -11141,8 +11186,8 @@ fi

# checks for library functions
for ac_func in alarm accept4 setitimer getitimer bind_textdomain_codeset chown \
clock confstr ctermid dup3 execv faccessat fchmod fchmodat fchown fchownat \
fexecve fdopendir fork fpathconf fstatat ftime ftruncate futimesat \
clock confstr crypt_r ctermid dup3 execv faccessat fchmod fchmodat fchown \
fchownat fexecve fdopendir fork fpathconf fstatat ftime ftruncate futimesat \
futimens futimes gai_strerror getentropy \
getgrouplist getgroups getlogin getloadavg getpeername getpgid getpid \
getpriority getresuid getresgid getpwent getspnam getspent getsid getwd \
Expand Down
7 changes: 4 additions & 3 deletions configure.ac
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Expand Up @@ -2043,7 +2043,7 @@ dnl AC_MSG_RESULT($cpp_type)

# checks for header files
AC_HEADER_STDC
AC_CHECK_HEADERS(asm/types.h conio.h direct.h dlfcn.h errno.h \
AC_CHECK_HEADERS(asm/types.h conio.h crypt.h direct.h dlfcn.h errno.h \
fcntl.h grp.h \
ieeefp.h io.h langinfo.h libintl.h process.h pthread.h \
sched.h shadow.h signal.h stropts.h termios.h \
Expand Down Expand Up @@ -2679,6 +2679,7 @@ AC_MSG_RESULT($SHLIBS)
AC_CHECK_LIB(sendfile, sendfile)
AC_CHECK_LIB(dl, dlopen) # Dynamic linking for SunOS/Solaris and SYSV
AC_CHECK_LIB(dld, shl_load) # Dynamic linking for HP-UX
AC_CHECK_LIB(crypt, crypt) # crypt() on Linux
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HAVE_LIBCRYPT created by this doesn't seem to be used in Modules/_cryptmodule.c. I recently tried to use AC_CHECK_LIB for the same use case, but there were some comments concerning the test program created by autotools. I end up using the following approach:

AC_MSG_CHECKING(for uuid_generate_time_safe)
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <uuid/uuid.h>]], [[
#ifndef uuid_generate_time_safe
void *x = uuid_generate_time_safe
#endif
]])],
  [AC_DEFINE(HAVE_UUID_GENERATE_TIME_SAFE, 1, Define if uuid_generate_time_safe() exists.)
   AC_MSG_RESULT(yes)],
  [AC_MSG_RESULT(no)]
)


AC_MSG_CHECKING(for uuid_generate_time_safe)
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <uuid/uuid.h>]], [[
Expand Down Expand Up @@ -3409,8 +3410,8 @@ fi

# checks for library functions
AC_CHECK_FUNCS(alarm accept4 setitimer getitimer bind_textdomain_codeset chown \
clock confstr ctermid dup3 execv faccessat fchmod fchmodat fchown fchownat \
fexecve fdopendir fork fpathconf fstatat ftime ftruncate futimesat \
clock confstr crypt_r ctermid dup3 execv faccessat fchmod fchmodat fchown \
fchownat fexecve fdopendir fork fpathconf fstatat ftime ftruncate futimesat \
futimens futimes gai_strerror getentropy \
getgrouplist getgroups getlogin getloadavg getpeername getpgid getpid \
getpriority getresuid getresgid getpwent getspnam getspent getsid getwd \
Expand Down
9 changes: 9 additions & 0 deletions pyconfig.h.in
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Expand Up @@ -140,6 +140,12 @@
/* Define to 1 if you have the `copysign' function. */
#undef HAVE_COPYSIGN

/* Define to 1 if you have the <crypt.h> header file. */
#undef HAVE_CRYPT_H

/* Define to 1 if you have the `crypt_r' function. */
#undef HAVE_CRYPT_R

/* Define to 1 if you have the `ctermid' function. */
#undef HAVE_CTERMID

Expand Down Expand Up @@ -547,6 +553,9 @@
/* Define to 1 if you have the `lgamma' function. */
#undef HAVE_LGAMMA

/* Define to 1 if you have the `crypt' library (-lcrypt). */
#undef HAVE_LIBCRYPT

/* Define to 1 if you have the `dl' library (-ldl). */
#undef HAVE_LIBDL

Expand Down