diff options
| author | Kees Cook <keescook@chromium.org> | 2020-07-02 11:49:23 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-07-16 08:17:26 +0200 |
| commit | ebce5c1fb51b185b60927a6c5bf1fad12e1812fc (patch) | |
| tree | 5d4e0d4c793e09c7f05d10393c3e23dd3aa8e1c7 /kernel/module.c | |
| parent | 80d9453806d20c65d9d58875711dbe8e9d236ef2 (diff) | |
kallsyms: Refactor kallsyms_show_value() to take cred
commit 160251842cd35a75edfb0a1d76afa3eb674ff40a upstream.
In order to perform future tests against the cred saved during open(),
switch kallsyms_show_value() to operate on a cred, and have all current
callers pass current_cred(). This makes it very obvious where callers
are checking the wrong credential in their "read" contexts. These will
be fixed in the coming patches.
Additionally switch return value to bool, since it is always used as a
direct permission check, not a 0-on-success, negative-on-error style
function return.
Cc: stable@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel/module.c')
| -rw-r--r-- | kernel/module.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/module.c b/kernel/module.c index 20fc0efc679c..08d4b7811ae5 100644 --- a/kernel/module.c +++ b/kernel/module.c @@ -4258,7 +4258,7 @@ static int modules_open(struct inode *inode, struct file *file) if (!err) { struct seq_file *m = file->private_data; - m->private = kallsyms_show_value() ? NULL : (void *)8ul; + m->private = kallsyms_show_value(current_cred()) ? NULL : (void *)8ul; } return err; |