diff options
| author | Kees Cook | 2022-08-16 12:14:54 -0700 |
|---|---|---|
| committer | Kees Cook | 2022-08-16 12:17:18 -0700 |
| commit | 6a3981af3fd97fec57f2c5eeca213cbf5216a3c0 (patch) | |
| tree | 6a24427f919e17b23e9b959d78357e5884cc1119 | |
| parent | 27603a606fda0806d7c08914bc976931aa42020e (diff) | |
LoadPin: Return EFAULT on copy_from_user() failures
The copy_from_user() function returns the number of bytes remaining to
be copied on a failure. Such failures should return -EFAULT to high
levels.
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Fixes: 3f805f8cc23b ("LoadPin: Enable loading from trusted dm-verity devices")
Cc: Matthias Kaehlcke <mka@chromium.org>
Cc: James Morris <jmorris@namei.org>
Cc: "Serge E. Hallyn" <serge@hallyn.com>
Cc: linux-security-module@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
| -rw-r--r-- | security/loadpin/loadpin.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/security/loadpin/loadpin.c b/security/loadpin/loadpin.c index 6ab5f2bbf41f..44521582dcba 100644 --- a/security/loadpin/loadpin.c +++ b/security/loadpin/loadpin.c @@ -356,13 +356,11 @@ static long dm_verity_ioctl(struct file *filp, unsigned int cmd, unsigned long a { void __user *uarg = (void __user *)arg; unsigned int fd; - int rc; switch (cmd) { case LOADPIN_IOC_SET_TRUSTED_VERITY_DIGESTS: - rc = copy_from_user(&fd, uarg, sizeof(fd)); - if (rc) - return rc; + if (copy_from_user(&fd, uarg, sizeof(fd))) + return -EFAULT; return read_trusted_verity_root_digests(fd); |