diff options
Diffstat (limited to 'elf/dl-support.c')
| -rw-r--r-- | elf/dl-support.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/elf/dl-support.c b/elf/dl-support.c index 8c58b2ba69..448f4c6848 100644 --- a/elf/dl-support.c +++ b/elf/dl-support.c @@ -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; + } } |