diff options
Diffstat (limited to 'elf/dl-support.c')
| -rw-r--r-- | elf/dl-support.c | 23 |
1 files changed, 21 insertions, 2 deletions
diff --git a/elf/dl-support.c b/elf/dl-support.c index 1616eec2f4..6a02e4ea1f 100644 --- a/elf/dl-support.c +++ b/elf/dl-support.c @@ -121,9 +121,19 @@ int _dl_debug_fd = STDERR_FILENO; int _dl_correct_cache_id = _DL_CACHE_DEFAULT_ID; -struct ElfW(Phdr) *_dl_phdr; +ElfW(Phdr) *_dl_phdr; size_t _dl_phnum; -unsigned long int _dl_hwcap; +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. */ @@ -260,6 +270,15 @@ _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; + } } |