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Mark internal stdlib functions with attribute_hidden [BZ #18822]
Mark internal stdlib functions with attribute_hidden to allow direct access within libc.so and libc.a without using GOT nor PLT. __realpath is hidden with libc_hidden_proto and libc_hidden_def since the exported realpath is an alias of __realpath. [BZ #18822] * include/stdlib.h (__random): Add attribute_hidden. (__random_r): Likewise. (__srandom_r): Likewise. (__initstate_r): Likewise. (__setstate_r): Likewise. (__erand48_r): Likewise. (__nrand48_r): Likewise. (__jrand48_r): Likewise. (__srand48_r): Likewise. (__seed48_r): Likewise. (__lcong48_r): Likewise. (__drand48_iterate): Likewise. (__setenv): Likewise. (__unsetenv): Likewise. (__clearenv): Likewise. (__ptsname_r): Likewise. (__posix_openpt): Likewise. (__add_to_environ): Likewise. (__realpath): Add libc_hidden_proto. (__ecvt_r): Likewise. (__fcvt_r): Likewise. (__qecvt_r): Likewise. (__qfcvt_r): Likewise. * misc/efgcvt_r.c (cvt_symbol_1): Add libc_hidden_def (local). * stdlib/canonicalize.c (__realpath): Add libc_hidden_def.
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H.J. Lu
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ChangeLog
29
ChangeLog
@ -1,3 +1,32 @@
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2017-10-01 H.J. Lu <hongjiu.lu@intel.com>
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[BZ #18822]
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* include/stdlib.h (__random): Add attribute_hidden.
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(__random_r): Likewise.
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(__srandom_r): Likewise.
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(__initstate_r): Likewise.
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(__setstate_r): Likewise.
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(__erand48_r): Likewise.
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(__nrand48_r): Likewise.
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(__jrand48_r): Likewise.
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(__srand48_r): Likewise.
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(__seed48_r): Likewise.
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(__lcong48_r): Likewise.
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(__drand48_iterate): Likewise.
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(__setenv): Likewise.
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(__unsetenv): Likewise.
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(__clearenv): Likewise.
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(__ptsname_r): Likewise.
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(__posix_openpt): Likewise.
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(__add_to_environ): Likewise.
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(__realpath): Add libc_hidden_proto.
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(__ecvt_r): Likewise.
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(__fcvt_r): Likewise.
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(__qecvt_r): Likewise.
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(__qfcvt_r): Likewise.
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* misc/efgcvt_r.c (cvt_symbol_1): Add libc_hidden_def (local).
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* stdlib/canonicalize.c (__realpath): Add libc_hidden_def.
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2017-10-01 H.J. Lu <hongjiu.lu@intel.com>
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[BZ #18822]
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@ -36,56 +36,65 @@ libc_hidden_proto (__qsort_r)
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libc_hidden_proto (lrand48_r)
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libc_hidden_proto (wctomb)
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extern long int __random (void);
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extern long int __random (void) attribute_hidden;
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extern void __srandom (unsigned int __seed);
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extern char *__initstate (unsigned int __seed, char *__statebuf,
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size_t __statelen);
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extern char *__setstate (char *__statebuf);
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extern int __random_r (struct random_data *__buf, int32_t *__result);
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extern int __srandom_r (unsigned int __seed, struct random_data *__buf);
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extern int __random_r (struct random_data *__buf, int32_t *__result)
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attribute_hidden;
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extern int __srandom_r (unsigned int __seed, struct random_data *__buf)
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attribute_hidden;
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extern int __initstate_r (unsigned int __seed, char *__statebuf,
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size_t __statelen, struct random_data *__buf);
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extern int __setstate_r (char *__statebuf, struct random_data *__buf);
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size_t __statelen, struct random_data *__buf)
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attribute_hidden;
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extern int __setstate_r (char *__statebuf, struct random_data *__buf)
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attribute_hidden;
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extern int __rand_r (unsigned int *__seed);
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extern int __erand48_r (unsigned short int __xsubi[3],
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struct drand48_data *__buffer, double *__result);
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struct drand48_data *__buffer, double *__result)
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attribute_hidden;
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extern int __nrand48_r (unsigned short int __xsubi[3],
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struct drand48_data *__buffer,
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long int *__result);
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long int *__result) attribute_hidden;
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extern int __jrand48_r (unsigned short int __xsubi[3],
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struct drand48_data *__buffer,
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long int *__result);
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long int *__result) attribute_hidden;
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extern int __srand48_r (long int __seedval,
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struct drand48_data *__buffer);
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struct drand48_data *__buffer) attribute_hidden;
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extern int __seed48_r (unsigned short int __seed16v[3],
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struct drand48_data *__buffer);
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struct drand48_data *__buffer) attribute_hidden;
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extern int __lcong48_r (unsigned short int __param[7],
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struct drand48_data *__buffer);
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struct drand48_data *__buffer) attribute_hidden;
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/* Internal function to compute next state of the generator. */
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extern int __drand48_iterate (unsigned short int __xsubi[3],
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struct drand48_data *__buffer);
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struct drand48_data *__buffer)
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attribute_hidden;
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/* Global state for non-reentrant functions. Defined in drand48-iter.c. */
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extern struct drand48_data __libc_drand48_data attribute_hidden;
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extern int __setenv (const char *__name, const char *__value, int __replace);
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extern int __unsetenv (const char *__name);
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extern int __clearenv (void);
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extern int __setenv (const char *__name, const char *__value, int __replace)
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attribute_hidden;
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extern int __unsetenv (const char *__name) attribute_hidden;
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extern int __clearenv (void) attribute_hidden;
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extern char *__mktemp (char *__template) __THROW __nonnull ((1));
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extern char *__canonicalize_file_name (const char *__name);
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extern char *__realpath (const char *__name, char *__resolved);
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extern int __ptsname_r (int __fd, char *__buf, size_t __buflen);
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libc_hidden_proto (__realpath)
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extern int __ptsname_r (int __fd, char *__buf, size_t __buflen)
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attribute_hidden;
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# ifndef _ISOMAC
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extern int __ptsname_internal (int fd, char *buf, size_t buflen,
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struct stat64 *stp) attribute_hidden;
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# endif
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extern int __getpt (void);
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extern int __posix_openpt (int __oflag);
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extern int __posix_openpt (int __oflag) attribute_hidden;
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extern int __add_to_environ (const char *name, const char *value,
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const char *combines, int replace);
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const char *combines, int replace)
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attribute_hidden;
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extern void _quicksort (void *const pbase, size_t total_elems,
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size_t size, __compar_d_fn_t cmp, void *arg);
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@ -250,9 +259,11 @@ extern char *__gcvt (double __value, int __ndigit, char *__buf);
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extern int __ecvt_r (double __value, int __ndigit, int *__restrict __decpt,
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int *__restrict __sign, char *__restrict __buf,
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size_t __len);
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libc_hidden_proto (__ecvt_r)
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extern int __fcvt_r (double __value, int __ndigit, int *__restrict __decpt,
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int *__restrict __sign, char *__restrict __buf,
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size_t __len);
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libc_hidden_proto (__fcvt_r)
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extern char *__qecvt (long double __value, int __ndigit,
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int *__restrict __decpt, int *__restrict __sign);
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extern char *__qfcvt (long double __value, int __ndigit,
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@ -261,9 +272,11 @@ extern char *__qgcvt (long double __value, int __ndigit, char *__buf);
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extern int __qecvt_r (long double __value, int __ndigit,
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int *__restrict __decpt, int *__restrict __sign,
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char *__restrict __buf, size_t __len);
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libc_hidden_proto (__qecvt_r)
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extern int __qfcvt_r (long double __value, int __ndigit,
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int *__restrict __decpt, int *__restrict __sign,
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char *__restrict __buf, size_t __len);
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libc_hidden_proto (__qfcvt_r)
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# if IS_IN (libc)
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# undef MB_CUR_MAX
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@ -240,6 +240,7 @@ __APPEND (FUNC_PREFIX, ecvt_r) (FLOAT_TYPE value, int ndigit, int *decpt,
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cvt_symbol_1 (libc, __APPEND (FUNC_PREFIX, symbol), \
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APPEND (FUNC_PREFIX, symbol), GLIBC_2_4)
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# define cvt_symbol_1(lib, local, symbol, version) \
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libc_hidden_def (local) \
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versioned_symbol (lib, local, symbol, version)
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# else
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# define cvt_symbol(symbol) \
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@ -247,11 +248,15 @@ __APPEND (FUNC_PREFIX, ecvt_r) (FLOAT_TYPE value, int ndigit, int *decpt,
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APPEND (q, symbol), GLIBC_2_0); \
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weak_alias (__APPEND (FUNC_PREFIX, symbol), APPEND (FUNC_PREFIX, symbol))
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# define cvt_symbol_1(lib, local, symbol, version) \
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libc_hidden_def (local) \
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compat_symbol (lib, local, symbol, version)
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# endif
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#else
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# define cvt_symbol(symbol) \
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weak_alias (__APPEND (FUNC_PREFIX, symbol), APPEND (FUNC_PREFIX, symbol))
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cvt_symbol_1 (__APPEND (FUNC_PREFIX, symbol), APPEND (FUNC_PREFIX, symbol))
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# define cvt_symbol_1(local, symbol) \
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libc_hidden_def (local) \
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weak_alias (local, symbol)
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#endif
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cvt_symbol(fcvt_r);
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cvt_symbol(ecvt_r);
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@ -218,6 +218,7 @@ error:
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free (rpath);
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return NULL;
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}
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libc_hidden_def (__realpath)
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versioned_symbol (libc, __realpath, realpath, GLIBC_2_3);
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