powerpc/module: Fix TOC symbol CRC

The commit 71ec7c55ed91 introduced the magic symbol ".TOC." for ELFv2 ABI.
This symbol is built manually and has no CRC value computed. A zero value
is put in the CRC section to avoid modpost complaining about a missing CRC.
Unfortunately, this breaks the kernel module loading when the kernel is
relocated (kdump case for instance) because of the relocation applied to
the kcrctab values.

This patch compute a CRC value for the TOC symbol which will match the one
compute by the kernel when it is relocated - aka '0 - relocate_start' done in
maybe_relocated called by check_version (module.c).

Signed-off-by: Laurent Dufour <ldufour@linux.vnet.ibm.com>
Cc: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 10 insertions, 1 deletions

diff --git a/arch/powerpc/kernel/module_64.c b/arch/powerpc/kernel/module_64.c
index 077d2ce6c5a7..d807ee626af9 100644
--- a/arch/powerpc/kernel/module_64.c
+++ b/arch/powerpc/kernel/module_64.c
@@ -315,8 +315,17 @@ static void dedotify_versions(struct modversion_info *vers,
         struct modversion_info *end;
 
         for (end = (void *)vers + size; vers < end; vers++)
-                if (vers->name[0] == '.')
+                if (vers->name[0] == '.') {
                         memmove(vers->name, vers->name+1, strlen(vers->name));
+#ifdef ARCH_RELOCATES_KCRCTAB
+                        /* The TOC symbol has no CRC computed. To avoid CRC
+                         * check failing, we must force it to the expected
+                         * value (see CRC check in module.c).
+                         */
+                        if (!strcmp(vers->name, "TOC."))
+                                vers->crc = -(unsigned long)reloc_start;
+#endif
+                }
 }
 
 /* Undefined symbols which refer to .funcname, hack to funcname (or .TOC.) */