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* sysdeps/generic/enbl-secure.c (__libc_enable_secure_decided): New
	variable.
	(__libc_init_secure): Don't do anything if __libc_enable_secure_decided
	is nonzero.
	* include/unistd.h: Declare __libc_enable_secure_decided.
	* elf/dl-support.c (_dl_aux_init): Recognize AT_UID, AT_EUID, AT_GID,
	and AT_EGID.  If all found, set __libc_enable_secure and
	__libc_enable_secure_decided.
This commit is contained in:
Ulrich Drepper 2003-05-06 06:34:21 +00:00
parent 9946f75ad4
commit be4d80380a
6 changed files with 50 additions and 3 deletions
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9
ChangeLog
View File

@ -1,5 +1,14 @@
2003-05-05 Ulrich Drepper <drepper@redhat.com>
* sysdeps/generic/enbl-secure.c (__libc_enable_secure_decided): New
variable.
(__libc_init_secure): Don't do anything if __libc_enable_secure_decided
is nonzero.
* include/unistd.h: Declare __libc_enable_secure_decided.
* elf/dl-support.c (_dl_aux_init): Recognize AT_UID, AT_EUID, AT_GID,
and AT_EGID. If all found, set __libc_enable_secure and
__libc_enable_secure_decided.
* sysdeps/generic/libc-start.c [!SHARED]: Call
__libc_check_standard_fds after __libc_init_first.

25
elf/dl-support.c
View File

@ -148,6 +148,10 @@ void
internal_function
_dl_aux_init (ElfW(auxv_t) *av)
{
int seen = 0;
uid_t uid = 0;
gid_t gid = 0;
for (; av->a_type != AT_NULL; ++av)
switch (av->a_type)
{
@ -168,6 +172,27 @@ _dl_aux_init (ElfW(auxv_t) *av)
GL(dl_sysinfo) = av->a_un.a_val;
break;
#endif
case AT_UID:
uid ^= av->a_un.a_val;
seen |= 1;
break;
case AT_EUID:
uid ^= av->a_un.a_val;
seen |= 2;
break;
case AT_GID:
gid ^= av->a_un.a_val;
seen |= 4;
break;
case AT_EGID:
gid ^= av->a_un.a_val;
seen |= 8;
break;
}
if (seen == 0xf)
{
__libc_enable_secure = uid != 0 || gid != 0;
__libc_enable_secure_decided = 1;
}
}
#endif

1
include/unistd.h
View File

@ -140,6 +140,7 @@ libc_hidden_proto (__sbrk)
and some functions contained in the C library ignore various
environment variables that normally affect them. */
extern int __libc_enable_secure;
extern int __libc_enable_secure_decided;
#ifdef IS_IN_rtld
/* XXX The #ifdef should go. */
extern int __libc_enable_secure_internal attribute_hidden;

5
linuxthreads/ChangeLog
View File

@ -1,3 +1,8 @@
2003-05-05 Ulrich Drepper <drepper@redhat.com>
* sysdeps/i386/tls.h (TLS_DO_SET_THREAD_AREA): Add \n to error
messages.
2003-05-04 Roland McGrath <roland@redhat.com>
* Makefile ($(objpfx)../libc.so): New target.

4
nptl/ChangeLog
View File

@ -1,3 +1,7 @@
2003-05-05 Ulrich Drepper <drepper@redhat.com>
* sysdeps/i386/tls.h (TLS_INIT_TP): Include \n in error message.
2003-05-04 Roland McGrath <roland@redhat.com>
* Makefile ($(objpfx)../libc.so): New target.

5
sysdeps/generic/enbl-secure.c
View File

@ -1,5 +1,5 @@
/* Define and initialize the `__libc_enable_secure' flag. Generic version.
Copyright (C) 1996, 1997, 1998, 2000 Free Software Foundation, Inc.
Copyright (C) 1996, 1997, 1998, 2000, 2003 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@ -23,12 +23,15 @@
#include <unistd.h>
#include <libc-internal.h>
/* If nonzero __libc_enable_secure is already set. */
int __libc_enable_secure_decided;
/* Safest assumption, if somehow the initializer isn't run. */
int __libc_enable_secure = 1;
void
__libc_init_secure (void)
{
if (__libc_enable_secure_decided == 0)
__libc_enable_secure = (__geteuid () != __getuid ()
|| __getegid () != __getgid ());
}