diff options
Diffstat (limited to 'elf')
| -rw-r--r-- | elf/dl-support.c | 46 |
1 files changed, 32 insertions, 14 deletions
diff --git a/elf/dl-support.c b/elf/dl-support.c index ef0e5591e3..9714f75db0 100644 --- a/elf/dl-support.c +++ b/elf/dl-support.c @@ -256,6 +256,25 @@ _dl_aux_init (ElfW(auxv_t) *av) for (int i = 0; i < array_length (auxv_values); ++i) auxv_values[i] = 0; _dl_parse_auxv (av, auxv_values); + + _dl_phdr = (void*) auxv_values[AT_PHDR]; + _dl_phnum = auxv_values[AT_PHNUM]; + + if (_dl_phdr == NULL) + { + /* Starting from binutils-2.23, the linker will define the + magic symbol __ehdr_start to point to our own ELF header + if it is visible in a segment that also includes the phdrs. + So we can set up _dl_phdr and _dl_phnum even without any + information from auxv. */ + + extern const ElfW(Ehdr) __ehdr_start attribute_hidden; + assert (__ehdr_start.e_phentsize == sizeof *GL(dl_phdr)); + _dl_phdr = (const void *) &__ehdr_start + __ehdr_start.e_phoff; + _dl_phnum = __ehdr_start.e_phnum; + } + + assert (_dl_phdr != NULL); } #endif @@ -324,20 +343,19 @@ _dl_non_dynamic_init (void) if (_dl_platform != NULL) _dl_platformlen = strlen (_dl_platform); - if (_dl_phdr != NULL) - for (const ElfW(Phdr) *ph = _dl_phdr; ph < &_dl_phdr[_dl_phnum]; ++ph) - switch (ph->p_type) - { - /* Check if the stack is nonexecutable. */ - case PT_GNU_STACK: - _dl_stack_flags = ph->p_flags; - break; - - case PT_GNU_RELRO: - _dl_main_map.l_relro_addr = ph->p_vaddr; - _dl_main_map.l_relro_size = ph->p_memsz; - break; - } + for (const ElfW(Phdr) *ph = _dl_phdr; ph < &_dl_phdr[_dl_phnum]; ++ph) + switch (ph->p_type) + { + /* Check if the stack is nonexecutable. */ + case PT_GNU_STACK: + _dl_stack_flags = ph->p_flags; + break; + + case PT_GNU_RELRO: + _dl_main_map.l_relro_addr = ph->p_vaddr; + _dl_main_map.l_relro_size = ph->p_memsz; + break; + } call_function_static_weak (_dl_find_object_init); |