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| author | Josh Poimboeuf <jpoimboe@redhat.com> | 2017-02-14 02:42:39 +0100 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2017-03-08 09:24:04 +0100 |
| commit | f5e547f4ac785c65a39211f0b8e4ffc4fe09112d (patch) | |
| tree | 8a4826c72030d35bfed306ac748463c25b536cd0 /kernel/livepatch/core.c | |
| parent | livepatch: use kstrtobool() in enabled_store() (diff) | |
| download | linux-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/core.c')
| -rw-r--r-- | kernel/livepatch/core.c | 16 |
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; |