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authorJosh Poimboeuf <jpoimboe@redhat.com>2020-04-29 10:24:43 -0500
committerJiri Kosina <jkosina@suse.cz>2020-05-08 00:12:42 +0200
commitdcf550e52f567cb7a421169d2522869f9188aca5 (patch)
tree8132935cd192b34addd1a3eb2c8cb120258510e6 /kernel/livepatch
parenta811c1fa0a02c062555b54651065899437bacdbe (diff)
downloadlinux-dcf550e52f567cb7a421169d2522869f9188aca5.tar.bz2
livepatch: Disallow vmlinux.ko
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>
Diffstat (limited to 'kernel/livepatch')
-rw-r--r--kernel/livepatch/core.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c
index c3512e7e0801..40cfac8156fd 100644
--- a/kernel/livepatch/core.c
+++ b/kernel/livepatch/core.c
@@ -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()