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2003-09-23 Roland McGrath <roland@redhat.com>

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* sysdeps/generic/ldsodefs.h (struct rtld_global): Add _dl_stack_flags
	and _dl_make_stack_executable_hook.  Declare _dl_make_stack_executable.
	* elf/rtld.c (_rtld_global): Add initializer for _dl_stack_flags.
	(dl_main): Reset _dl_stack_flags according to PT_GNU_STACK phdr.
	Initialize _dl_make_stack_executable_hook.
	* elf/dl-support.c: Define those new variables.
	(_dl_non_dynamic_init): Scan phdrs for PT_GNU_STACK.
	(_dl_phdr): Fix type.
	* elf/dl-load.c (_dl_map_object_from_fd): Grok PT_GNU_STACK phdr and
	enable execute permission for the stack if necessary.
	* sysdeps/generic/dl-execstack.c: New file.
	* elf/Makefile (dl-routines): Add it.
	* elf/Versions (ld: GLIBC_PRIVATE): Add _dl_make_stack_executable.
	* sysdeps/unix/sysv/linux/dl-execstack.c: New file.
This commit is contained in:
Roland McGrath
2003-09-23 12:06:48 +00:00
parent 1deb5779e2
commit ecdeaac05f
7 changed files with 210 additions and 1 deletions
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19
elf/dl-support.c
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@ -129,6 +129,16 @@ ElfW(Phdr) *_dl_phdr;
size_t _dl_phnum;
unsigned long int _dl_hwcap __attribute__ ((nocommon));
/* Prevailing state of the stack, PF_X indicating it's executable. */
ElfW(Word) _dl_stack_flags = PF_R|PF_W|PF_X;
/* 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. */
int (*_dl_make_stack_executable_hook) (void) internal_function
= _dl_make_stack_executable;
#ifdef NEED_DL_SYSINFO
/* Needed for improved syscall handling on at least x86/Linux. */
uintptr_t _dl_sysinfo = DL_SYSINFO_DEFAULT;
@ -264,6 +274,15 @@ _dl_non_dynamic_init (void)
/* Now determine the length of the platform string. */
if (_dl_platform != NULL)
_dl_platformlen = strlen (_dl_platform);
/* Scan for a program header telling us the stack is nonexecutable. */
if (_dl_phdr != NULL)
for (uint_fast16_t i = 0; i < _dl_phnum; ++i)
if (_dl_phdr[i].p_type == PT_GNU_STACK)
{
_dl_stack_flags = _dl_phdr[i].p_flags;
break;
}
}