modpost: Fix modpost license checking of vmlinux.o

Commit f02e8a6596b7 ("module: Sort exported symbols") sorts symbols
placing each of them in its own elf section.  This sorting and merging
into the canonical sections are done by the linker.

Unfortunately modpost to generate Module.symvers file parses vmlinux.o
(which is not linked yet) and all modules object files (which aren't
linked yet).  These aren't sanitized by the linker yet.  That breaks
modpost that can't detect license properly for modules.

This patch makes modpost aware of the new exported symbols structure.

[ This above is a slightly corrected version of the explanation of the
  problem, copied from commit 62a2635610db ("modpost: Fix modpost's
  license checking V3").  That commit fixed the problem for module
  object files, but not for vmlinux.o.  This patch fixes modpost for
  vmlinux.o. ]

Signed-off-by: Frank Rowand <frank.rowand@am.sony.com>
Signed-off-by: Alessio Igor Bogani <abogani@kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index 3f01fd9087308bb84564358101c5761b38368e1c..c4e7d1510f9dfd3136d80e63684b8dc764794950 100644 (file)
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -132,8 +132,10 @@ static struct module *new_module(char *modname)
        /* strip trailing .o */
        s = strrchr(p, '.');
        if (s != NULL)
-               if (strcmp(s, ".o") == 0)
+               if (strcmp(s, ".o") == 0) {
                        *s = '\0';
+                       mod->is_dot_o = 1;
+               }
 
        /* add to list */
        mod->name = p;
@@ -587,7 +589,8 @@ static void handle_modversions(struct module *mod, struct elf_info *info,
        unsigned int crc;
        enum export export;
 
-       if (!is_vmlinux(mod->name) && strncmp(symname, "__ksymtab", 9) == 0)
+       if ((!is_vmlinux(mod->name) || mod->is_dot_o) &&
+           strncmp(symname, "__ksymtab", 9) == 0)
                export = export_from_secname(info, get_secindex(info, sym));
        else
                export = export_from_sec(info, get_secindex(info, sym));

diff --git a/scripts/mod/modpost.h b/scripts/mod/modpost.h
index 2031119080dce2ac5d8ca63aeb967f0505cc5f74..51207e4d5f8bcae0add675e31cf579f28763d1d4 100644 (file)
--- a/scripts/mod/modpost.h
+++ b/scripts/mod/modpost.h
@@ -113,6 +113,7 @@ struct module {
        int has_cleanup;
        struct buffer dev_table_buf;
        char         srcversion[25];
+       int is_dot_o;
 };
 
 struct elf_info {