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livepatch: Disallow vmlinux.ko

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This is purely a theoretical issue, but if there were a module named
vmlinux.ko, the livepatch relocation code wouldn't be able to
distinguish between vmlinux-specific and vmlinux.o-specific KLP
relocations.

If CONFIG_LIVEPATCH is enabled, don't allow a module named vmlinux.ko.

Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Acked-by: Miroslav Benes <mbenes@suse.cz>
Acked-by: Joe Lawrence <joe.lawrence@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Josh Poimboeuf 2020-04-29 10:24:43 -05:00 committed by Jiri Kosina
parent a811c1fa0a
commit dcf550e52f
1 changed files with 5 additions and 0 deletions
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5
kernel/livepatch/core.c
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@ -1139,6 +1139,11 @@ int klp_module_coming(struct module *mod)
if (WARN_ON(mod->state != MODULE_STATE_COMING))
return -EINVAL;
if (!strcmp(mod->name, "vmlinux")) {
pr_err("vmlinux.ko: invalid module name");
return -EINVAL;
}
mutex_lock(&klp_mutex);
/*
* Each module has to know that klp_module_coming()