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 <lduf...@linux.vnet.ibm.com>
Cc: Anton Blanchard <an...@samba.org>
---
arch/powerpc/kernel/module_64.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/kernel/module_64.c b/arch/powerpc/kernel/module_64.c
index 077d2ce..a80c933 100644
--- a/arch/powerpc/kernel/module_64.c
+++ b/arch/powerpc/kernel/module_64.c
@@ -315,8 +315,15 @@ 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));
+ /* 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;
+ }
}
/* Undefined symbols which refer to .funcname, hack to funcname (or .TOC.) */
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