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Commit e0049825 authored by Kees Cook's avatar Kees Cook Committed by Sam Ravnborg
Browse files

kbuild: make modpost detect unterminated device id lists 



Cause modpost to fail if any device id lists are incorrectly terminated,
after reporting the offender.
Improved reporting by akpm

Signed-off-by: default avatarKees Cook <kees@ubuntu.com>
Cc: Greg KH <greg@kroah.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Jeff Garzik <jeff@garzik.org>
Cc: Ben Collins <bcollins@ubuntu.com>
Cc: Michael Wu <flamingice@sourmilk.net>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarSam Ravnborg <sam@ravnborg.org>
parent 295ac051

scripts/mod/file2alias.c

+33 −7
Original line number Diff line number Diff line
@@ -55,10 +55,14 @@ do { \ 
 * Check that sizeof(device_id type) are consistent with size of section

 * in .o file. If in-consistent then userspace and kernel does not agree

 * on actual size which is a bug.

 * Also verify that the final entry in the table is all zeros.

 **/

static void device_id_size_check(const char *modname, const char *device_id,

				 unsigned long size, unsigned long id_size)

static void device_id_check(const char *modname, const char *device_id,

			    unsigned long size, unsigned long id_size,

			    void *symval)

{

	int i;



	if (size % id_size || size < id_size) {

		fatal("%s: sizeof(struct %s_device_id)=%lu is not a modulo "

		      "of the size of section __mod_%s_device_table=%lu.\n"
@@ -66,6 +70,20 @@ static void device_id_size_check(const char *modname, const char *device_id, 
		      "in mod_devicetable.h\n",

		      modname, device_id, id_size, device_id, size, device_id);

	}

	/* Verify last one is a terminator */

	for (i = 0; i < id_size; i++ ) {

		if (*(uint8_t*)(symval+size-id_size+i)) {

			fprintf(stderr,"%s: struct %s_device_id is %lu bytes.  "

				"The last of %lu is:\n",

				modname, device_id, id_size, size / id_size);

			for (i = 0; i < id_size; i++ )

				fprintf(stderr,"0x%02x ",

					*(uint8_t*)(symval+size-id_size+i) );

			fprintf(stderr,"\n");

			fatal("%s: struct %s_device_id is not terminated "

				"with a NULL entry!\n", modname, device_id);

		}

	}

}



/* USB is special because the bcdDevice can be matched against a numeric range */
@@ -168,7 +186,7 @@ static void do_usb_table(void *symval, unsigned long size, 
	unsigned int i;

	const unsigned long id_size = sizeof(struct usb_device_id);



	device_id_size_check(mod->name, "usb", size, id_size);

	device_id_check(mod->name, "usb", size, id_size, symval);



	/* Leave last one: it's the terminator. */

	size -= id_size;
@@ -535,7 +553,7 @@ static void do_table(void *symval, unsigned long size, 
	char alias[500];

	int (*do_entry)(const char *, void *entry, char *alias) = function;



	device_id_size_check(mod->name, device_id, size, id_size);

	device_id_check(mod->name, device_id, size, id_size, symval);

	/* Leave last one: it's the terminator. */

	size -= id_size;
@@ -557,14 +575,21 @@ void handle_moddevtable(struct module *mod, struct elf_info *info, 
			Elf_Sym *sym, const char *symname)

{

	void *symval;

	char *zeros = NULL;



	/* We're looking for a section relative symbol */

	if (!sym->st_shndx || sym->st_shndx >= info->hdr->e_shnum)

		return;



	/* Handle all-NULL symbols allocated into .bss */

	if (info->sechdrs[sym->st_shndx].sh_type & SHT_NOBITS) {

		zeros = calloc(1, sym->st_size);

		symval = zeros;

	} else {

		symval = (void *)info->hdr

			+ info->sechdrs[sym->st_shndx].sh_offset

			+ sym->st_value;

	}



	if (sym_is(symname, "__mod_pci_device_table"))

		do_table(symval, sym->st_size,
@@ -637,6 +662,7 @@ void handle_moddevtable(struct module *mod, struct elf_info *info, 
		do_table(symval, sym->st_size,

			 sizeof(struct ssb_device_id), "ssb",

			 do_ssb_entry, mod);

	free(zeros);

}



/* Now add out buffered information to the generated C source */