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: Kees 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: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

diff --git a/scripts/mod/file2alias.c b/scripts/mod/file2alias.c
index 36e3754..7abee0f 100644 (file)
--- a/scripts/mod/file2alias.c
+++ b/scripts/mod/file2alias.c
@@ -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;
 
-       symval = (void *)info->hdr
-               + info->sechdrs[sym->st_shndx].sh_offset
-               + sym->st_value;
+       /* 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 */