15 void freader_init_from_file(struct freader *r, void *buf, u32 buf_sz,  in freader_init_from_file()  argument
18 	memset(r, 0, sizeof(*r));  in freader_init_from_file()
19 	r->buf = buf;  in freader_init_from_file()
20 	r->buf_sz = buf_sz;  in freader_init_from_file()
21 	r->file = file;  in freader_init_from_file()
22 	r->may_fault = may_fault;  in freader_init_from_file()
25 void freader_init_from_mem(struct freader *r, const char *data, u64 data_sz)  in freader_init_from_mem()  argument
27 	memset(r, 0, sizeof(*r));  in freader_init_from_mem()
28 	r->data = data;  in freader_init_from_mem()
29 	r->data_sz = data_sz;  in freader_init_from_mem()
32 static void freader_put_folio(struct freader *r)  in freader_put_folio()  argument
34 	if (!r->folio)  in freader_put_folio()
36 	kunmap_local(r->addr);  in freader_put_folio()
37 	folio_put(r->folio);  in freader_put_folio()
38 	r->folio = NULL;  in freader_put_folio()
41 static int freader_get_folio(struct freader *r, loff_t file_off)  in freader_get_folio()  argument
44 	if (r->folio && file_off >= r->folio_off &&  in freader_get_folio()
45 	    file_off < r->folio_off + folio_size(r->folio))  in freader_get_folio()
48 	freader_put_folio(r);  in freader_get_folio()
51 	r->folio = filemap_get_folio(r->file->f_mapping, file_off >> PAGE_SHIFT);  in freader_get_folio()
53 	if (IS_ERR(r->folio) || !folio_test_uptodate(r->folio)) {  in freader_get_folio()
54 		if (!IS_ERR(r->folio))  in freader_get_folio()
55 			folio_put(r->folio);  in freader_get_folio()
56 		r->folio = NULL;  in freader_get_folio()
60 	r->folio_off = folio_pos(r->folio);  in freader_get_folio()
61 	r->addr = kmap_local_folio(r->folio, 0);  in freader_get_folio()
66 const void *freader_fetch(struct freader *r, loff_t file_off, size_t sz)  in freader_fetch()  argument
71 	if (WARN_ON(r->buf && sz > r->buf_sz)) {  in freader_fetch()
72 		r->err = -E2BIG;  in freader_fetch()
77 		r->err = -EOVERFLOW;  in freader_fetch()
82 	if (!r->buf) {  in freader_fetch()
83 		if (file_off + sz > r->data_sz) {  in freader_fetch()
84 			r->err = -ERANGE;  in freader_fetch()
87 		return r->data + file_off;  in freader_fetch()
91 	if (secretmem_mapping(r->file->f_mapping)) {  in freader_fetch()
92 		r->err = -EFAULT;  in freader_fetch()
97 	if (r->may_fault) {  in freader_fetch()
100 		ret = __kernel_read(r->file, r->buf, sz, &file_off);  in freader_fetch()
102 			r->err = (ret < 0) ? ret : -EIO;  in freader_fetch()
105 		return r->buf;  in freader_fetch()
109 	r->err = freader_get_folio(r, file_off);  in freader_fetch()
110 	if (r->err)  in freader_fetch()
117 	folio_sz = folio_size(r->folio);  in freader_fetch()
118 	if (file_off + sz > r->folio_off + folio_sz) {  in freader_fetch()
119 		u64 part_sz = r->folio_off + folio_sz - file_off, off;  in freader_fetch()
121 		memcpy(r->buf, r->addr + file_off - r->folio_off, part_sz);  in freader_fetch()
126 			r->err = freader_get_folio(r, r->folio_off + folio_sz);  in freader_fetch()
127 			if (r->err)  in freader_fetch()
129 			folio_sz = folio_size(r->folio);  in freader_fetch()
131 			memcpy(r->buf + off, r->addr, part_sz);  in freader_fetch()
135 		return r->buf;  in freader_fetch()
139 	return r->addr + (file_off - r->folio_off);  in freader_fetch()
142 void freader_cleanup(struct freader *r)  in freader_cleanup()  argument
144 	if (!r->buf)  in freader_cleanup()
147 	freader_put_folio(r);  in freader_cleanup()
155 static int parse_build_id(struct freader *r, unsigned char *build_id, __u32 *size,  in parse_build_id()  argument
168 		nhdr = freader_fetch(r, note_off, sizeof(Elf32_Nhdr) + note_name_sz);  in parse_build_id()
170 			return r->err;  in parse_build_id()
188 			data = freader_fetch(r, build_id_off, desc_sz);  in parse_build_id()
190 				return r->err;  in parse_build_id()
206 static int get_build_id_32(struct freader *r, unsigned char *build_id, __u32 *size)  in get_build_id_32()  argument
212 	ehdr = freader_fetch(r, 0, sizeof(Elf32_Ehdr));  in get_build_id_32()
214 		return r->err;  in get_build_id_32()
229 		phdr = freader_fetch(r, phoff + i * sizeof(Elf32_Phdr), sizeof(Elf32_Phdr));  in get_build_id_32()
231 			return r->err;  in get_build_id_32()
234 		    !parse_build_id(r, build_id, size, READ_ONCE(phdr->p_offset),  in get_build_id_32()
242 static int get_build_id_64(struct freader *r, unsigned char *build_id, __u32 *size)  in get_build_id_64()  argument
249 	ehdr = freader_fetch(r, 0, sizeof(Elf64_Ehdr));  in get_build_id_64()
251 		return r->err;  in get_build_id_64()
266 		phdr = freader_fetch(r, phoff + i * sizeof(Elf64_Phdr), sizeof(Elf64_Phdr));  in get_build_id_64()
268 			return r->err;  in get_build_id_64()
271 		    !parse_build_id(r, build_id, size, READ_ONCE(phdr->p_offset),  in get_build_id_64()
286 	struct freader r;  in __build_id_parse()  local
294 	freader_init_from_file(&r, buf, sizeof(buf), vma->vm_file, may_fault);  in __build_id_parse()
297 	ehdr = freader_fetch(&r, 0, offsetofend(Elf32_Ehdr, e_type));  in __build_id_parse()
299 		ret = r.err;  in __build_id_parse()
314 		ret = get_build_id_32(&r, build_id, size);  in __build_id_parse()
316 		ret = get_build_id_64(&r, build_id, size);  in __build_id_parse()
318 	freader_cleanup(&r);  in __build_id_parse()
364 	struct freader r;  in build_id_parse_buf()  local
367 	freader_init_from_mem(&r, buf, buf_size);  in build_id_parse_buf()
369 	err = parse_build_id(&r, build_id, NULL, 0, buf_size);  in build_id_parse_buf()
371 	freader_cleanup(&r);  in build_id_parse_buf()