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authorKees Cook <keescook@chromium.org>2022-08-16 12:14:54 -0700
committerKees Cook <keescook@chromium.org>2022-08-16 12:17:18 -0700
commit6a3981af3fd97fec57f2c5eeca213cbf5216a3c0 (patch)
tree6a24427f919e17b23e9b959d78357e5884cc1119 /security/loadpin
parent27603a606fda0806d7c08914bc976931aa42020e (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>
Diffstat (limited to 'security/loadpin')
-rw-r--r--security/loadpin/loadpin.c6
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);