kbuild, modpost: Check the section flags, to catch missing "ax"/"aw"

When you put
  .section ".foo"
in an assembly file instead of
  .section "foo", "ax"
, one of the possible symptoms is that modpost will see an
ld-generated section name ".foo.1" in section_rel() or section_rela().
But this heuristic has two problems: it will miss a bad section that
has no relocations, and it will incorrectly flag many gcc-generated
sections as bad when compiling with -ffunction-sections
-fdata-sections.

On mips it fixes a lot of bogus warnings with gcc 4.4.0 lije this one:
WARNING: crypto/cryptd.o (.text.T.349): unexpected section name.

So instead of checking whether the section name matches a particular
pattern, we directly check for a missing SHF_ALLOC in the section
flags.

Signed-off-by: Anders Kaseorg <andersk@mit.edu>
Tested-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index e5ae695..936b6f8 100644 (file)
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -716,41 +716,27 @@ int match(const char *sym, const char * const pat[])
 
 /* sections that we do not want to do full section mismatch check on */
 static const char *section_white_list[] =
-       { ".debug*", ".stab*", ".note*", ".got*", ".toc*", NULL };
+       { ".comment", ".debug*", ".stab*", ".note*", ".got*", ".toc*", NULL };
 
 /*
- * Is this section one we do not want to check?
- * This is often debug sections.
- * If we are going to check this section then
- * test if section name ends with a dot and a number.
- * This is used to find sections where the linker have
- * appended a dot-number to make the name unique.
+ * This is used to find sections missing the SHF_ALLOC flag.
  * The cause of this is often a section specified in assembler
- * without "ax" / "aw" and the same section used in .c
- * code where gcc add these.
+ * without "ax" / "aw".
  */
-static int check_section(const char *modname, const char *sec)
-{
-       const char *e = sec + strlen(sec) - 1;
-       if (match(sec, section_white_list))
-               return 1;
-
-       if (*e && isdigit(*e)) {
-               /* consume all digits */
-               while (*e && e != sec && isdigit(*e))
-                       e--;
-               if (*e == '.' && !strstr(sec, ".linkonce")) {
-                       warn("%s (%s): unexpected section name.\n"
-                            "The (.[number]+) following section name are "
-                            "ld generated and not expected.\n"
-                            "Did you forget to use \"ax\"/\"aw\" "
-                            "in a .S file?\n"
-                            "Note that for example <linux/init.h> contains\n"
-                            "section definitions for use in .S files.\n\n",
-                            modname, sec);
-               }
+static void check_section(const char *modname, struct elf_info *elf,
+                          Elf_Shdr *sechdr)
+{
+       const char *sec = sech_name(elf, sechdr);
+
+       if (sechdr->sh_type == SHT_PROGBITS &&
+           !(sechdr->sh_flags & SHF_ALLOC) &&
+           !match(sec, section_white_list)) {
+               warn("%s (%s): unexpected non-allocatable section.\n"
+                    "Did you forget to use \"ax\"/\"aw\" in a .S file?\n"
+                    "Note that for example <linux/init.h> contains\n"
+                    "section definitions for use in .S files.\n\n",
+                    modname, sec);
        }
-       return 0;
 }
 
 
@@ -1358,7 +1344,7 @@ static void section_rela(const char *modname, struct elf_info *elf,
        fromsec = sech_name(elf, sechdr);
        fromsec += strlen(".rela");
        /* if from section (name) is know good then skip it */
-       if (check_section(modname, fromsec))
+       if (match(fromsec, section_white_list))
                return;
 
        for (rela = start; rela < stop; rela++) {
@@ -1402,7 +1388,7 @@ static void section_rel(const char *modname, struct elf_info *elf,
        fromsec = sech_name(elf, sechdr);
        fromsec += strlen(".rel");
        /* if from section (name) is know good then skip it */
-       if (check_section(modname, fromsec))
+       if (match(fromsec, section_white_list))
                return;
 
        for (rel = start; rel < stop; rel++) {
@@ -1465,6 +1451,7 @@ static void check_sec_ref(struct module *mod, const char *modname,
 
        /* Walk through all sections */
        for (i = 0; i < elf->hdr->e_shnum; i++) {
+               check_section(modname, elf, &elf->sechdrs[i]);
                /* We want to process only relocation sections and not .init */
                if (sechdrs[i].sh_type == SHT_RELA)
                        section_rela(modname, elf, &elf->sechdrs[i]);