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| author | Laurent Dufour <ldufour@linux.vnet.ibm.com> | 2014-06-24 10:53:59 +0200 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2014-06-25 05:10:48 +0200 |
| commit | c2cbcf533a1d7443cf1d6aae1127491792601587 (patch) | |
| tree | ac6b3f35ebb65d59d07fdd8ee1bf93a33566c777 /arch/powerpc/kernel/module_64.c | |
| parent | powerpc/powernv: Remove OPAL v1 takeover (diff) | |
| download | linux-c2cbcf533a1d7443cf1d6aae1127491792601587.tar.xz linux-c2cbcf533a1d7443cf1d6aae1127491792601587.zip | |
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>
Diffstat (limited to 'arch/powerpc/kernel/module_64.c')
| -rw-r--r-- | arch/powerpc/kernel/module_64.c | 11 |
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.) */ |