170 static void acct_arg_size(struct linux_binprm *bprm, unsigned long pages)  in acct_arg_size()  argument
173 	long diff = (long)(pages - bprm->vma_pages);  in acct_arg_size()
178 	bprm->vma_pages = pages;  in acct_arg_size()
182 static struct page *get_arg_page(struct linux_binprm *bprm, unsigned long pos,  in get_arg_page()  argument
190 		ret = expand_downwards(bprm->vma, pos);  in get_arg_page()
195 	ret = get_user_pages(current, bprm->mm, pos,  in get_arg_page()
201 		unsigned long size = bprm->vma->vm_end - bprm->vma->vm_start;  in get_arg_page()
204 		acct_arg_size(bprm, size / PAGE_SIZE);  in get_arg_page()
235 static void free_arg_page(struct linux_binprm *bprm, int i)  in free_arg_page()  argument
239 static void free_arg_pages(struct linux_binprm *bprm)  in free_arg_pages()  argument
243 static void flush_arg_page(struct linux_binprm *bprm, unsigned long pos,  in flush_arg_page()  argument
246 	flush_cache_page(bprm->vma, pos, page_to_pfn(page));  in flush_arg_page()
249 static int __bprm_mm_init(struct linux_binprm *bprm)  in __bprm_mm_init()  argument
253 	struct mm_struct *mm = bprm->mm;  in __bprm_mm_init()
255 	bprm->vma = vma = kmem_cache_zalloc(vm_area_cachep, GFP_KERNEL);  in __bprm_mm_init()
282 	bprm->p = vma->vm_end - sizeof(void *);  in __bprm_mm_init()
286 	bprm->vma = NULL;  in __bprm_mm_init()
291 static bool valid_arg_len(struct linux_binprm *bprm, long len)  in valid_arg_len()  argument
298 static inline void acct_arg_size(struct linux_binprm *bprm, unsigned long pages)  in acct_arg_size()  argument
302 static struct page *get_arg_page(struct linux_binprm *bprm, unsigned long pos,  in get_arg_page()  argument
307 	page = bprm->page[pos / PAGE_SIZE];  in get_arg_page()
312 		bprm->page[pos / PAGE_SIZE] = page;  in get_arg_page()
322 static void free_arg_page(struct linux_binprm *bprm, int i)  in free_arg_page()  argument
324 	if (bprm->page[i]) {  in free_arg_page()
325 		__free_page(bprm->page[i]);  in free_arg_page()
326 		bprm->page[i] = NULL;  in free_arg_page()
330 static void free_arg_pages(struct linux_binprm *bprm)  in free_arg_pages()  argument
335 		free_arg_page(bprm, i);  in free_arg_pages()
338 static void flush_arg_page(struct linux_binprm *bprm, unsigned long pos,  in flush_arg_page()  argument
343 static int __bprm_mm_init(struct linux_binprm *bprm)  in __bprm_mm_init()  argument
345 	bprm->p = PAGE_SIZE * MAX_ARG_PAGES - sizeof(void *);  in __bprm_mm_init()
349 static bool valid_arg_len(struct linux_binprm *bprm, long len)  in valid_arg_len()  argument
351 	return len <= bprm->p;  in valid_arg_len()
362 static int bprm_mm_init(struct linux_binprm *bprm)  in bprm_mm_init()  argument
367 	bprm->mm = mm = mm_alloc();  in bprm_mm_init()
372 	err = __bprm_mm_init(bprm);  in bprm_mm_init()
380 		bprm->mm = NULL;  in bprm_mm_init()
455 			struct linux_binprm *bprm)  in copy_strings()  argument
477 		if (!valid_arg_len(bprm, len))  in copy_strings()
481 		pos = bprm->p;  in copy_strings()
483 		bprm->p -= len;  in copy_strings()
510 				page = get_arg_page(bprm, pos, 1);  in copy_strings()
524 				flush_arg_page(bprm, kpos, kmapped_page);  in copy_strings()
546 			struct linux_binprm *bprm)  in copy_strings_kernel()  argument
555 	r = copy_strings(argc, argv, bprm);  in copy_strings_kernel()
641 int setup_arg_pages(struct linux_binprm *bprm,  in setup_arg_pages()  argument
648 	struct vm_area_struct *vma = bprm->vma;  in setup_arg_pages()
672 	mm->arg_start = bprm->p - stack_shift;  in setup_arg_pages()
673 	bprm->p = vma->vm_end - stack_shift;  in setup_arg_pages()
684 	bprm->p -= stack_shift;  in setup_arg_pages()
685 	mm->arg_start = bprm->p;  in setup_arg_pages()
688 	if (bprm->loader)  in setup_arg_pages()
689 		bprm->loader -= stack_shift;  in setup_arg_pages()
690 	bprm->exec -= stack_shift;  in setup_arg_pages()
741 	current->mm->start_stack = bprm->p;  in setup_arg_pages()
1076 int flush_old_exec(struct linux_binprm * bprm)  in flush_old_exec()  argument
1093 	set_mm_exe_file(bprm->mm, bprm->file);  in flush_old_exec()
1098 	acct_arg_size(bprm, 0);  in flush_old_exec()
1099 	retval = exec_mmap(bprm->mm);  in flush_old_exec()
1103 	bprm->mm = NULL;		/* We're using it now */  in flush_old_exec()
1109 	current->personality &= ~bprm->per_clear;  in flush_old_exec()
1118 void would_dump(struct linux_binprm *bprm, struct file *file)  in would_dump()  argument
1121 		bprm->interp_flags |= BINPRM_FLAGS_ENFORCE_NONDUMP;  in would_dump()
1125 void setup_new_exec(struct linux_binprm * bprm)  in setup_new_exec()  argument
1138 	__set_task_comm(current, kbasename(bprm->filename), true);  in setup_new_exec()
1147 	if (!uid_eq(bprm->cred->uid, current_euid()) ||  in setup_new_exec()
1148 	    !gid_eq(bprm->cred->gid, current_egid())) {  in setup_new_exec()
1151 		would_dump(bprm, bprm->file);  in setup_new_exec()
1152 		if (bprm->interp_flags & BINPRM_FLAGS_ENFORCE_NONDUMP)  in setup_new_exec()
1170 int prepare_bprm_creds(struct linux_binprm *bprm)  in prepare_bprm_creds()  argument
1175 	bprm->cred = prepare_exec_creds();  in prepare_bprm_creds()
1176 	if (likely(bprm->cred))  in prepare_bprm_creds()
1183 static void free_bprm(struct linux_binprm *bprm)  in free_bprm()  argument
1185 	free_arg_pages(bprm);  in free_bprm()
1186 	if (bprm->cred) {  in free_bprm()
1188 		abort_creds(bprm->cred);  in free_bprm()
1190 	if (bprm->file) {  in free_bprm()
1191 		allow_write_access(bprm->file);  in free_bprm()
1192 		fput(bprm->file);  in free_bprm()
1195 	if (bprm->interp != bprm->filename)  in free_bprm()
1196 		kfree(bprm->interp);  in free_bprm()
1197 	kfree(bprm);  in free_bprm()
1200 int bprm_change_interp(char *interp, struct linux_binprm *bprm)  in bprm_change_interp()  argument
1203 	if (bprm->interp != bprm->filename)  in bprm_change_interp()
1204 		kfree(bprm->interp);  in bprm_change_interp()
1205 	bprm->interp = kstrdup(interp, GFP_KERNEL);  in bprm_change_interp()
1206 	if (!bprm->interp)  in bprm_change_interp()
1215 void install_exec_creds(struct linux_binprm *bprm)  in install_exec_creds()  argument
1217 	security_bprm_committing_creds(bprm);  in install_exec_creds()
1219 	commit_creds(bprm->cred);  in install_exec_creds()
1220 	bprm->cred = NULL;  in install_exec_creds()
1235 	security_bprm_committed_creds(bprm);  in install_exec_creds()
1245 static void check_unsafe_exec(struct linux_binprm *bprm)  in check_unsafe_exec()  argument
1252 			bprm->unsafe |= LSM_UNSAFE_PTRACE_CAP;  in check_unsafe_exec()
1254 			bprm->unsafe |= LSM_UNSAFE_PTRACE;  in check_unsafe_exec()
1262 		bprm->unsafe |= LSM_UNSAFE_NO_NEW_PRIVS;  in check_unsafe_exec()
1275 		bprm->unsafe |= LSM_UNSAFE_SHARE;  in check_unsafe_exec()
1281 static void bprm_fill_uid(struct linux_binprm *bprm)  in bprm_fill_uid()  argument
1289 	bprm->cred->euid = current_euid();  in bprm_fill_uid()
1290 	bprm->cred->egid = current_egid();  in bprm_fill_uid()
1292 	if (bprm->file->f_path.mnt->mnt_flags & MNT_NOSUID)  in bprm_fill_uid()
1298 	inode = file_inode(bprm->file);  in bprm_fill_uid()
1313 	if (!kuid_has_mapping(bprm->cred->user_ns, uid) ||  in bprm_fill_uid()
1314 		 !kgid_has_mapping(bprm->cred->user_ns, gid))  in bprm_fill_uid()
1318 		bprm->per_clear |= PER_CLEAR_ON_SETID;  in bprm_fill_uid()
1319 		bprm->cred->euid = uid;  in bprm_fill_uid()
1323 		bprm->per_clear |= PER_CLEAR_ON_SETID;  in bprm_fill_uid()
1324 		bprm->cred->egid = gid;  in bprm_fill_uid()
1334 int prepare_binprm(struct linux_binprm *bprm)  in prepare_binprm()  argument
1338 	bprm_fill_uid(bprm);  in prepare_binprm()
1341 	retval = security_bprm_set_creds(bprm);  in prepare_binprm()
1344 	bprm->cred_prepared = 1;  in prepare_binprm()
1346 	memset(bprm->buf, 0, BINPRM_BUF_SIZE);  in prepare_binprm()
1347 	return kernel_read(bprm->file, 0, bprm->buf, BINPRM_BUF_SIZE);  in prepare_binprm()
1357 int remove_arg_zero(struct linux_binprm *bprm)  in remove_arg_zero()  argument
1364 	if (!bprm->argc)  in remove_arg_zero()
1368 		offset = bprm->p & ~PAGE_MASK;  in remove_arg_zero()
1369 		page = get_arg_page(bprm, bprm->p, 0);  in remove_arg_zero()
1377 				offset++, bprm->p++)  in remove_arg_zero()
1384 			free_arg_page(bprm, (bprm->p >> PAGE_SHIFT) - 1);  in remove_arg_zero()
1387 	bprm->p++;  in remove_arg_zero()
1388 	bprm->argc--;  in remove_arg_zero()
1400 int search_binary_handler(struct linux_binprm *bprm)  in search_binary_handler()  argument
1407 	if (bprm->recursion_depth > 5)  in search_binary_handler()
1410 	retval = security_bprm_check(bprm);  in search_binary_handler()
1421 		bprm->recursion_depth++;  in search_binary_handler()
1422 		retval = fmt->load_binary(bprm);  in search_binary_handler()
1425 		bprm->recursion_depth--;  in search_binary_handler()
1426 		if (retval < 0 && !bprm->mm) {  in search_binary_handler()
1432 		if (retval != -ENOEXEC || !bprm->file) {  in search_binary_handler()
1440 		if (printable(bprm->buf[0]) && printable(bprm->buf[1]) &&  in search_binary_handler()
1441 		    printable(bprm->buf[2]) && printable(bprm->buf[3]))  in search_binary_handler()
1443 		if (request_module("binfmt-%04x", *(ushort *)(bprm->buf + 2)) < 0)  in search_binary_handler()
1453 static int exec_binprm(struct linux_binprm *bprm)  in exec_binprm()  argument
1464 	ret = search_binary_handler(bprm);  in exec_binprm()
1466 		audit_bprm(bprm);  in exec_binprm()
1467 		trace_sched_process_exec(current, old_pid, bprm);  in exec_binprm()
1484 	struct linux_binprm *bprm;  in do_execveat_common()  local
1513 	bprm = kzalloc(sizeof(*bprm), GFP_KERNEL);  in do_execveat_common()
1514 	if (!bprm)  in do_execveat_common()
1517 	retval = prepare_bprm_creds(bprm);  in do_execveat_common()
1521 	check_unsafe_exec(bprm);  in do_execveat_common()
1531 	bprm->file = file;  in do_execveat_common()
1533 		bprm->filename = filename->name;  in do_execveat_common()
1550 			bprm->interp_flags |= BINPRM_FLAGS_PATH_INACCESSIBLE;  in do_execveat_common()
1551 		bprm->filename = pathbuf;  in do_execveat_common()
1553 	bprm->interp = bprm->filename;  in do_execveat_common()
1555 	retval = bprm_mm_init(bprm);  in do_execveat_common()
1559 	bprm->argc = count(argv, MAX_ARG_STRINGS);  in do_execveat_common()
1560 	if ((retval = bprm->argc) < 0)  in do_execveat_common()
1563 	bprm->envc = count(envp, MAX_ARG_STRINGS);  in do_execveat_common()
1564 	if ((retval = bprm->envc) < 0)  in do_execveat_common()
1567 	retval = prepare_binprm(bprm);  in do_execveat_common()
1571 	retval = copy_strings_kernel(1, &bprm->filename, bprm);  in do_execveat_common()
1575 	bprm->exec = bprm->p;  in do_execveat_common()
1576 	retval = copy_strings(bprm->envc, envp, bprm);  in do_execveat_common()
1580 	retval = copy_strings(bprm->argc, argv, bprm);  in do_execveat_common()
1584 	retval = exec_binprm(bprm);  in do_execveat_common()
1593 	free_bprm(bprm);  in do_execveat_common()
1601 	if (bprm->mm) {  in do_execveat_common()
1602 		acct_arg_size(bprm, 0);  in do_execveat_common()
1603 		mmput(bprm->mm);  in do_execveat_common()
1611 	free_bprm(bprm);  in do_execveat_common()