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livepatch: x86: fix relocation computation with kASLR 

With kASLR enabled, old_addr provided by patch module is being shifted
accrodingly so that the symbol lookups work. To have module relocations
handled properly as well, the same transformation needs to be perfomed
on relocation address information.

[jkosina@suse.cz: extended / reworded changelog a bit]
Reported-by: Cyril B. <cbay@alwaysdata.com>
Signed-off-by: Zhou Chengming <zhouchengming1@huawei.com>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
hifive-unleashed-5.1
Zhou Chengming 2015-11-06 14:25:00 +08:00 committed by Jiri Kosina
parent 99aaa9c64b
commit e41b104c7d
1 changed files with 6 additions and 0 deletions
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6
kernel/livepatch/core.c
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@ -294,6 +294,12 @@ static int klp_write_object_relocations(struct module *pmod,
for (reloc = obj->relocs; reloc->name; reloc++) {
if (!klp_is_module(obj)) {
#if defined(CONFIG_RANDOMIZE_BASE)
/* If KASLR has been enabled, adjust old value accordingly */
if (kaslr_enabled())
reloc->val += kaslr_offset();
#endif
ret = klp_verify_vmlinux_symbol(reloc->name,
reloc->val);
if (ret)