diff options
| author | jb <jb@138bc75d-0d04-0410-961f-82ee72b054a4> | 2017-05-19 13:25:21 +0000 |
|---|---|---|
| committer | jb <jb@138bc75d-0d04-0410-961f-82ee72b054a4> | 2017-05-19 13:25:21 +0000 |
| commit | 8aee1d9bb4af84751adc8260c16b8a4ac0827dbb (patch) | |
| tree | 7abd70258f41ca875f5067f40fc0d04d711c6a91 /libgfortran | |
| parent | fd847994d5093b888c5cc1ead8625c6c1c03501b (diff) | |
Don't assume __secure_getenv is available
Glibc 2.17 made __secure_getenv an officially supported function, and
renamed it secure_getenv. The libgfortran configure has checked for
both of these, per
https://sourceware.org/glibc/wiki/Tips_and_Tricks/secure_getenv.
Unfortunately, while the dynamical library (libc.so) retains the
__secure_getenv symbol for backwards compatibility, the static library
(libc.a) does not. This means that a libgfortran.a compiled against an
older glibc will not work if one tries to link against a newer
libc.a. This creates problems for providing gfortran binary
distributions that work on as many target systems as possible.
Thus, retain the support for __secure_getenv but call it only via a
weak reference.
Backported from trunk.
2017-05-19 Janne Blomqvist <jb@gcc.gnu.org>
* libgfortran.h: HAVE_SECURE_GETENV: Don't check
HAVE___SECURE_GETENV.
* environ/runtime.c (secure_getenv): Use __secure_getenv via a
weak reference.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gcc-7-branch@248273 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'libgfortran')
| -rw-r--r-- | libgfortran/ChangeLog | 8 | ||||
| -rw-r--r-- | libgfortran/libgfortran.h | 4 | ||||
| -rw-r--r-- | libgfortran/runtime/environ.c | 11 |
3 files changed, 20 insertions, 3 deletions
diff --git a/libgfortran/ChangeLog b/libgfortran/ChangeLog index 2541f5a824ac..6bfd3614c284 100644 --- a/libgfortran/ChangeLog +++ b/libgfortran/ChangeLog @@ -1,3 +1,11 @@ +2017-05-19 Janne Blomqvist <jb@gcc.gnu.org> + + Backport from trunk + * libgfortran.h: HAVE_SECURE_GETENV: Don't check + HAVE___SECURE_GETENV. + * environ/runtime.c (secure_getenv): Use __secure_getenv via a + weak reference. + 2017-05-17 Jerry DeLisle <jvdelisle@gcc.gnu.org> Backport from trunk diff --git a/libgfortran/libgfortran.h b/libgfortran/libgfortran.h index cfa4fcf0edc4..9d9d11728bdb 100644 --- a/libgfortran/libgfortran.h +++ b/libgfortran/libgfortran.h @@ -808,9 +808,7 @@ internal_proto(get_unformatted_convert); /* Secure getenv() which returns NULL if running as SUID/SGID. */ #ifndef HAVE_SECURE_GETENV -#ifdef HAVE___SECURE_GETENV -#define secure_getenv __secure_getenv -#elif defined(HAVE_GETUID) && defined(HAVE_GETEUID) \ +#if defined(HAVE_GETUID) && defined(HAVE_GETEUID) \ && defined(HAVE_GETGID) && defined(HAVE_GETEGID) #define FALLBACK_SECURE_GETENV extern char *secure_getenv (const char *); diff --git a/libgfortran/runtime/environ.c b/libgfortran/runtime/environ.c index bf02188edec8..f0a593e6074b 100644 --- a/libgfortran/runtime/environ.c +++ b/libgfortran/runtime/environ.c @@ -37,9 +37,20 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see provided. */ #ifdef FALLBACK_SECURE_GETENV + +#if SUPPORTS_WEAKREF && defined(HAVE___SECURE_GETENV) +static char* weak_secure_getenv (const char*) + __attribute__((__weakref__("__secure_getenv"))); +#endif + char * secure_getenv (const char *name) { +#if SUPPORTS_WEAKREF && defined(HAVE___SECURE_GETENV) + if (weak_secure_getenv) + return weak_secure_getenv (name); +#endif + if ((getuid () == geteuid ()) && (getgid () == getegid ())) return getenv (name); else |