7  * binfmt_misc detects binaries via a magic or filename extension and invokes
17 #include <linux/magic.h>
46 enum {Enabled, Magic};  enumerator
55 	int offset;			/* offset of magic */
56 	int size;			/* size of magic/mask */
57 	char *magic;			/* magic or filename extension */  member
76  *  - magic:  128 bytes (512 in escaped form)
106 		if (!test_bit(Magic, &e->flags)) {  in check_file()
107 			if (p && !strcmp(e->magic, p + 1))  in check_file()
112 		/* Do matching based on magic & mask. */  in check_file()
116 				if ((*s++ ^ e->magic[j]) & e->mask[j])  in check_file()
120 				if ((*s++ ^ e->magic[j]))  in check_file()
269  * ':name:type:offset:magic:mask:interpreter:flags'
326 		pr_debug("register: type: M (magic)\n");  in create_entry()
327 		e->flags = (1 << Enabled) | (1 << Magic);  in create_entry()
335 	if (test_bit(Magic, &e->flags)) {  in create_entry()
336 		/* Handle the 'M' (magic) format. */  in create_entry()
354 		/* Parse the 'magic' field. */  in create_entry()
355 		e->magic = p;  in create_entry()
359 		if (!e->magic[0])  in create_entry()
363 				KBUILD_MODNAME ": register: magic[raw]: ",  in create_entry()
364 				DUMP_PREFIX_NONE, e->magic, p - e->magic);  in create_entry()
380 		 * Decode the magic & mask fields.  in create_entry()
385 		e->size = string_unescape_inplace(e->magic, UNESCAPE_HEX);  in create_entry()
392 		pr_debug("register: magic/mask length: %i\n", e->size);  in create_entry()
395 				KBUILD_MODNAME ": register: magic[decoded]: ",  in create_entry()
396 				DUMP_PREFIX_NONE, e->magic, e->size);  in create_entry()
408 						masked[i] = e->magic[i] & e->mask[i];  in create_entry()
410 						KBUILD_MODNAME ": register:  magic[masked]: ",  in create_entry()
426 		/* Parse the 'magic' field. */  in create_entry()
427 		e->magic = p;  in create_entry()
432 		if (!e->magic[0] || strchr(e->magic, '/'))  in create_entry()
434 		pr_debug("register: extension: {%s}\n", e->magic);  in create_entry()
527 	if (!test_bit(Magic, &e->flags)) {  in entry_status()
528 		sprintf(dp, "extension .%s\n", e->magic);  in entry_status()
531 		dp = bin2hex(dp, e->magic, e->size);  in entry_status()