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modpost: Fix modpost license checking of vmlinux.o 

Commit f02e8a6596 ("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 62a2635610 ("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>
This commit is contained in:
Frank Rowand 2012-04-09 17:59:03 -07:00 committed by Linus Torvalds
parent 83dbbdbb38
commit 258f742635
2 changed files with 6 additions and 2 deletions
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7
scripts/mod/modpost.c
View File

@ -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));

1
scripts/mod/modpost.h
View File

@ -113,6 +113,7 @@ struct module {
int has_cleanup;
struct buffer dev_table_buf;
char srcversion[25];
int is_dot_o;
};
struct elf_info {