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authorJosh Poimboeuf <jpoimboe@redhat.com>2017-02-14 02:42:39 +0100
committerJiri Kosina <jkosina@suse.cz>2017-03-08 09:24:04 +0100
commitf5e547f4ac785c65a39211f0b8e4ffc4fe09112d (patch)
tree8a4826c72030d35bfed306ac748463c25b536cd0 /kernel/livepatch
parentlivepatch: use kstrtobool() in enabled_store() (diff)
downloadlinux-f5e547f4ac785c65a39211f0b8e4ffc4fe09112d.tar.xz
linux-f5e547f4ac785c65a39211f0b8e4ffc4fe09112d.zip
livepatch: store function sizes
For the consistency model we'll need to know the sizes of the old and new functions to determine if they're on the stacks of any tasks. Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Acked-by: Miroslav Benes <mbenes@suse.cz> Reviewed-by: Petr Mladek <pmladek@suse.com> Reviewed-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'kernel/livepatch')
-rw-r--r--kernel/livepatch/core.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c
index 83c4949862b4..10ba3a1578bd 100644
--- a/kernel/livepatch/core.c
+++ b/kernel/livepatch/core.c
@@ -584,6 +584,22 @@ static int klp_init_object_loaded(struct klp_patch *patch,
&func->old_addr);
if (ret)
return ret;
+
+ ret = kallsyms_lookup_size_offset(func->old_addr,
+ &func->old_size, NULL);
+ if (!ret) {
+ pr_err("kallsyms size lookup failed for '%s'\n",
+ func->old_name);
+ return -ENOENT;
+ }
+
+ ret = kallsyms_lookup_size_offset((unsigned long)func->new_func,
+ &func->new_size, NULL);
+ if (!ret) {
+ pr_err("kallsyms size lookup failed for '%s' replacement\n",
+ func->old_name);
+ return -ENOENT;
+ }
}
return 0;