Differential D17117 Diff 49767 head/libexec/rtld-elf/map_object.c

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head/libexec/rtld-elf/map_object.c

Show First 20 Lines • Show All 87 Lines • ▼ Show 20 Lines	map_object(int fd, const char path, const struct stat sb)
caddr_t bss_addr;		caddr_t bss_addr;
Elf_Word stack_flags;		Elf_Word stack_flags;
Elf_Addr relro_page;		Elf_Addr relro_page;
size_t relro_size;		size_t relro_size;
Elf_Addr note_start;		Elf_Addr note_start;
Elf_Addr note_end;		Elf_Addr note_end;
char *note_map;		char *note_map;
size_t note_map_len;		size_t note_map_len;
		Elf_Addr text_end;

hdr = get_elf_header(fd, path, sb);		hdr = get_elf_header(fd, path, sb);
if (hdr == NULL)		if (hdr == NULL)
return (NULL);		return (NULL);

/*		/*
* Scan the program header entries, and save key information.		* Scan the program header entries, and save key information.
*		*
* We expect that the loadable segments are ordered by load address.		* We expect that the loadable segments are ordered by load address.
*/		*/
phdr = (Elf_Phdr ) ((char )hdr + hdr->e_phoff);		phdr = (Elf_Phdr ) ((char )hdr + hdr->e_phoff);
phsize = hdr->e_phnum * sizeof (phdr[0]);		phsize = hdr->e_phnum * sizeof (phdr[0]);
phlimit = phdr + hdr->e_phnum;		phlimit = phdr + hdr->e_phnum;
nsegs = -1;		nsegs = -1;
phdyn = phinterp = phtls = NULL;		phdyn = phinterp = phtls = NULL;
phdr_vaddr = 0;		phdr_vaddr = 0;
relro_page = 0;		relro_page = 0;
relro_size = 0;		relro_size = 0;
note_start = 0;		note_start = 0;
note_end = 0;		note_end = 0;
note_map = NULL;		note_map = NULL;
segs = alloca(sizeof(segs[0]) * hdr->e_phnum);		segs = alloca(sizeof(segs[0]) * hdr->e_phnum);
stack_flags = RTLD_DEFAULT_STACK_PF_EXEC \| PF_R \| PF_W;		stack_flags = RTLD_DEFAULT_STACK_PF_EXEC \| PF_R \| PF_W;
		text_end = 0;
while (phdr < phlimit) {		while (phdr < phlimit) {
switch (phdr->p_type) {		switch (phdr->p_type) {

case PT_INTERP:		case PT_INTERP:
phinterp = phdr;		phinterp = phdr;
break;		break;

case PT_LOAD:		case PT_LOAD:
segs[++nsegs] = phdr;		segs[++nsegs] = phdr;
if ((segs[nsegs]->p_align & (PAGE_SIZE - 1)) != 0) {		if ((segs[nsegs]->p_align & (PAGE_SIZE - 1)) != 0) {
_rtld_error("%s: PT_LOAD segment %d not page-aligned",		_rtld_error("%s: PT_LOAD segment %d not page-aligned",
path, nsegs);		path, nsegs);
goto error;		goto error;
}		}
		if ((segs[nsegs]->p_flags & PF_X) == PF_X) {
		text_end = MAX(text_end,
		round_page(segs[nsegs]->p_vaddr + segs[nsegs]->p_memsz));
		}
break;		break;

case PT_PHDR:		case PT_PHDR:
phdr_vaddr = phdr->p_vaddr;		phdr_vaddr = phdr->p_vaddr;
phsize = phdr->p_memsz;		phsize = phdr->p_memsz;
break;		break;

case PT_DYNAMIC:		case PT_DYNAMIC:
▲ Show 20 Lines • Show All 134 Lines • ▼ Show 20 Lines	if (phdr_vaddr == 0 && data_offset <= hdr->e_phoff &&

obj = obj_new();		obj = obj_new();
if (sb != NULL) {		if (sb != NULL) {
obj->dev = sb->st_dev;		obj->dev = sb->st_dev;
obj->ino = sb->st_ino;		obj->ino = sb->st_ino;
}		}
obj->mapbase = mapbase;		obj->mapbase = mapbase;
obj->mapsize = mapsize;		obj->mapsize = mapsize;
obj->textsize = round_page(segs[0]->p_vaddr + segs[0]->p_memsz) -		obj->textsize = text_end - base_vaddr;
base_vaddr;
obj->vaddrbase = base_vaddr;		obj->vaddrbase = base_vaddr;
obj->relocbase = mapbase - base_vaddr;		obj->relocbase = mapbase - base_vaddr;
obj->dynamic = (const Elf_Dyn *) (obj->relocbase + phdyn->p_vaddr);		obj->dynamic = (const Elf_Dyn *) (obj->relocbase + phdyn->p_vaddr);
if (hdr->e_entry != 0)		if (hdr->e_entry != 0)
obj->entry = (caddr_t) (obj->relocbase + hdr->e_entry);		obj->entry = (caddr_t) (obj->relocbase + hdr->e_entry);
if (phdr_vaddr != 0) {		if (phdr_vaddr != 0) {
obj->phdr = (const Elf_Phdr *) (obj->relocbase + phdr_vaddr);		obj->phdr = (const Elf_Phdr *) (obj->relocbase + phdr_vaddr);
} else {		} else {
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