sys/kern/imgact_elf.c

89 static Elf_Brandinfo *__elfN(get_brandinfo)(struct image_params *imgp,
93 static int __elfN(load_section)(struct image_params *imgp, vm_ooffset_t offset,
95 static int __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp);
99 static boolean_t __elfN(check_note)(struct image_params *imgp,
313 __elfN(get_brandinfo)(struct image_params *imgp, const char *interp,
316 	const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header;
343 			ret = __elfN(check_note)(imgp, bi->brand_note, osrel,
347 				ret = bi->header_supported(imgp, osrel,
388 			    bi->header_supported(imgp, NULL, NULL)) {
416 			ret = bi->header_supported(imgp, NULL, NULL);
436 			    bi->header_supported(imgp, NULL, NULL)))
450 		    bi->header_supported(imgp, NULL, NULL)))
525 __elfN(map_insert)(struct image_params *imgp, vm_map_t map, vm_object_t object,
583 			locked = VOP_ISLOCKED(imgp->vp);
584 			VOP_UNLOCK(imgp->vp);
586 			vn_lock(imgp->vp, locked | LK_RETRY);
589 			MPASS(imgp->vp->v_object == object);
590 			VOP_SET_TEXT_CHECKED(imgp->vp);
597 __elfN(load_section)(struct image_params *imgp, vm_ooffset_t offset,
618 	if ((filsz != 0 && (off_t)filsz + offset > imgp->attr->va_size) ||
624 	object = imgp->object;
625 	map = &imgp->proc->p_vmspace->vm_map;
647 		rv = __elfN(map_insert)(imgp, map, object, file_addr,
670 		rv = __elfN(map_insert)(imgp, map, NULL, 0, map_addr,
701 __elfN(load_sections)(struct image_params *imgp, const Elf_Ehdr *hdr,
709 	ASSERT_VOP_LOCKED(imgp->vp, __func__);
720 		error = __elfN(load_section)(imgp, phdr[i].p_offset,
766 	struct image_params *imgp;
783 	imgp = &tempdata->image_params;
788 	imgp->proc = p;
789 	imgp->attr = attr;
798 	imgp->vp = nd->ni_vp;
803 	error = exec_check_permissions(imgp);
807 	error = exec_map_first_page(imgp);
811 	imgp->object = nd->ni_vp->v_object;
813 	hdr = (const Elf_Ehdr *)imgp->image_header;
831 	phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
837 	error = __elfN(load_sections)(imgp, hdr, phdr, rbase, &base_addr);
845 	if (imgp->firstpage)
846 		exec_unmap_first_page(imgp);
849 		if (imgp->textset)
883 __elfN(enforce_limits)(struct image_params *imgp, const Elf_Ehdr *hdr,
933 	PROC_LOCK(imgp->proc);
934 	if (data_size > lim_cur_proc(imgp->proc, RLIMIT_DATA))
938 	else if (total_size > lim_cur_proc(imgp->proc, RLIMIT_VMEM))
940 	else if (racct_set(imgp->proc, RACCT_DATA, data_size) != 0)
942 	else if (racct_set(imgp->proc, RACCT_VMEM, total_size) != 0)
944 	PROC_UNLOCK(imgp->proc);
950 	vmspace = imgp->proc->p_vmspace;
960 __elfN(get_interp)(struct image_params *imgp, const Elf_Phdr *phdr,
969 	ASSERT_VOP_LOCKED(imgp->vp, __func__);
993 			VOP_UNLOCK(imgp->vp);
995 			vn_lock(imgp->vp, LK_SHARED | LK_RETRY);
998 		error = vn_rdwr(UIO_READ, imgp->vp, interp,
1014 	interp = __DECONST(char *, imgp->image_header) + phdr->p_offset;
1026 __elfN(load_interp)(struct image_params *imgp, const Elf_Brandinfo *brand_info,
1037 		error = __elfN(load_file)(imgp->proc, path, addr, entry);
1046 		error = __elfN(load_file)(imgp->proc,
1052 	error = __elfN(load_file)(imgp->proc, interp, addr, entry);
1067 __CONCAT(exec_, __elfN(imgact))(struct image_params *imgp)
1085 	hdr = (const Elf_Ehdr *)imgp->image_header;
1106 	phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
1151 			error = __elfN(get_interp)(imgp, &phdr[i], &interp,
1158 				imgp->stack_prot =
1160 			imgp->stack_sz = phdr[i].p_memsz;
1168 	brand_info = __elfN(get_brandinfo)(imgp, interp, &osrel, &fctl0);
1192 			    (imgp->proc->p_flag2 & P2_ASLR_DISABLE) == 0) ||
1193 			    (imgp->proc->p_flag2 & P2_ASLR_ENABLE) != 0)
1211 	VOP_UNLOCK(imgp->vp);
1220 	if (imgp->credential_setid) {
1221 		PROC_LOCK(imgp->proc);
1222 		imgp->proc->p_flag2 &= ~(P2_ASLR_ENABLE | P2_ASLR_DISABLE);
1223 		PROC_UNLOCK(imgp->proc);
1226 	    (imgp->proc->p_flag2 & P2_ASLR_DISABLE) != 0 ||
1230 	} else if ((imgp->proc->p_flag2 & P2_ASLR_ENABLE) != 0 ||
1233 		imgp->map_flags |= MAP_ASLR;
1241 		    (imgp->proc->p_flag2 & P2_ASLR_IGNSTART) != 0)
1242 			imgp->map_flags |= MAP_ASLR_IGNSTART;
1246 		imgp->map_flags |= MAP_WXORX;
1248 	error = exec_new_vmspace(imgp, sv);
1249 	vmspace = imgp->proc->p_vmspace;
1252 	imgp->proc->p_sysent = sv;
1264 	vn_lock(imgp->vp, LK_SHARED | LK_RETRY);
1268 	error = __elfN(load_sections)(imgp, hdr, phdr, et_dyn_addr, NULL);
1272 	error = __elfN(enforce_limits)(imgp, hdr, phdr, et_dyn_addr);
1296 	imgp->entry_addr = entry;
1299 		VOP_UNLOCK(imgp->vp);
1307 		error = __elfN(load_interp)(imgp, brand_info, interp, &addr,
1308 		    &imgp->entry_addr);
1309 		vn_lock(imgp->vp, LK_SHARED | LK_RETRY);
1320 		VOP_UNLOCK(imgp->vp);
1322 		vn_lock(imgp->vp, LK_SHARED | LK_RETRY);
1334 	imgp->auxargs = elf_auxargs;
1335 	imgp->interpreted = 0;
1336 	imgp->reloc_base = addr;
1337 	imgp->proc->p_osrel = osrel;
1338 	imgp->proc->p_fctl0 = fctl0;
1339 	imgp->proc->p_elf_machine = hdr->e_machine;
1340 	imgp->proc->p_elf_flags = hdr->e_flags;
1351 __elfN(freebsd_copyout_auxargs)(struct image_params *imgp, uintptr_t base)
1353 	Elf_Auxargs *args = (Elf_Auxargs *)imgp->auxargs;
1370 	if (imgp->execpathp != 0)
1371 		AUXARGS_ENTRY_PTR(pos, AT_EXECPATH, imgp->execpathp);
1373 	    imgp->proc->p_ucred->cr_prison->pr_osreldate);
1374 	if (imgp->canary != 0) {
1375 		AUXARGS_ENTRY_PTR(pos, AT_CANARY, imgp->canary);
1376 		AUXARGS_ENTRY(pos, AT_CANARYLEN, imgp->canarylen);
1379 	if (imgp->pagesizes != 0) {
1380 		AUXARGS_ENTRY_PTR(pos, AT_PAGESIZES, imgp->pagesizes);
1381 		AUXARGS_ENTRY(pos, AT_PAGESIZESLEN, imgp->pagesizeslen);
1383 	if (imgp->sysent->sv_timekeep_base != 0) {
1385 		    imgp->sysent->sv_timekeep_base);
1387 	AUXARGS_ENTRY(pos, AT_STACKPROT, imgp->sysent->sv_shared_page_obj
1388 	    != NULL && imgp->stack_prot != 0 ? imgp->stack_prot :
1389 	    imgp->sysent->sv_stackprot);
1390 	if (imgp->sysent->sv_hwcap != NULL)
1391 		AUXARGS_ENTRY(pos, AT_HWCAP, *imgp->sysent->sv_hwcap);
1392 	if (imgp->sysent->sv_hwcap2 != NULL)
1393 		AUXARGS_ENTRY(pos, AT_HWCAP2, *imgp->sysent->sv_hwcap2);
1396 	AUXARGS_ENTRY(pos, AT_ARGC, imgp->args->argc);
1397 	AUXARGS_ENTRY_PTR(pos, AT_ARGV, imgp->argv);
1398 	AUXARGS_ENTRY(pos, AT_ENVC, imgp->args->envc);
1399 	AUXARGS_ENTRY_PTR(pos, AT_ENVV, imgp->envv);
1400 	AUXARGS_ENTRY_PTR(pos, AT_PS_STRINGS, imgp->ps_strings);
1401 	if (imgp->sysent->sv_fxrng_gen_base != 0)
1402 		AUXARGS_ENTRY(pos, AT_FXRNG, imgp->sysent->sv_fxrng_gen_base);
1405 	free(imgp->auxargs, M_TEMP);
1406 	imgp->auxargs = NULL;
1415 __elfN(freebsd_fixup)(uintptr_t *stack_base, struct image_params *imgp)
1421 	if (suword(base, imgp->args->argc) == -1)
2637 __elfN(parse_notes)(struct image_params *imgp, Elf_Note *checknote,
2650 	ASSERT_VOP_LOCKED(imgp->vp, "parse_notes");
2655 			VOP_UNLOCK(imgp->vp);
2657 			vn_lock(imgp->vp, LK_SHARED | LK_RETRY);
2659 		error = vn_rdwr(UIO_READ, imgp->vp, buf, pnote->p_filesz,
2669 		note = note0 = (const Elf_Note *)(imgp->image_header +
2671 		note_end = (const Elf_Note *)(imgp->image_header +
2762 __elfN(check_note)(struct image_params *imgp, Elf_Brandnote *brandnote,
2771 	hdr = (const Elf_Ehdr *)imgp->image_header;
2772 	phdr = (const Elf_Phdr *)(imgp->image_header + hdr->e_phoff);
2779 		if (phdr[i].p_type == PT_NOTE && __elfN(parse_notes)(imgp,
2784 				    __elfN(parse_notes)(imgp, &fctl_note,
2840 __elfN(stackgap)(struct image_params *imgp, uintptr_t *stack_base)
2850 	range = imgp->eff_stack_sz * pct / 100;