diff options
Diffstat (limited to 'sysdeps/generic')
| -rw-r--r-- | sysdeps/generic/dl-execstack.c | 32 | ||||
| -rw-r--r-- | sysdeps/generic/ldsodefs.h | 13 |
2 files changed, 45 insertions, 0 deletions
diff --git a/sysdeps/generic/dl-execstack.c b/sysdeps/generic/dl-execstack.c new file mode 100644 index 0000000000..04f87cf519 --- /dev/null +++ b/sysdeps/generic/dl-execstack.c @@ -0,0 +1,32 @@ +/* Stack executability handling for GNU dynamic linker. Stub version. + Copyright (C) 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 + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <ldsodefs.h> +#include <errno.h> + +/* There is no portable way to know the bounds of the initial thread's stack + so as to mprotect it. */ + +int +internal_function +_dl_make_stack_executable (void) +{ + return ENOSYS; +} +rtld_hidden_def (_dl_make_stack_executable) diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h index 58dfc15ca3..afb192925a 100644 --- a/sysdeps/generic/ldsodefs.h +++ b/sysdeps/generic/ldsodefs.h @@ -355,6 +355,14 @@ struct rtld_global EXTERN void (*_dl_rtld_unlock_recursive) (void *); #endif + /* Prevailing state of the stack, PF_X indicating it's executable. */ + EXTERN ElfW(Word) _dl_stack_flags; + + /* If loading a shared object requires that we make the stack executable + when it was not, we do it by calling this function. + It returns an errno code or zero on success. */ + EXTERN int (*_dl_make_stack_executable_hook) (void) internal_function; + /* Keep the conditional TLS members at the end so the layout of the structure used by !USE_TLS code matches the prefix of the layout in the USE_TLS rtld. Note that `struct link_map' is conditionally @@ -438,6 +446,11 @@ extern void **_dl_initial_error_catch_tsd (void) __attribute__ ((const)) attribute_hidden; #endif +/* This is the initial value of GL(dl_make_stack_executable_hook). + A threads library can change it. */ +extern int _dl_make_stack_executable (void) internal_function; +rtld_hidden_proto (_dl_make_stack_executable) + /* Parameters passed to the dynamic linker. */ extern int _dl_argc attribute_hidden; extern char **_dl_argv; |