diff options
Diffstat (limited to 'drivers/staging/p9auth/p9auth.c')
| -rw-r--r-- | drivers/staging/p9auth/p9auth.c | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/drivers/staging/p9auth/p9auth.c b/drivers/staging/p9auth/p9auth.c index 6704d97194a8..4f079faeb8a1 100644 --- a/drivers/staging/p9auth/p9auth.c +++ b/drivers/staging/p9auth/p9auth.c @@ -31,6 +31,8 @@ #include <linux/interrupt.h> #include <linux/scatterlist.h> #include <linux/crypto.h> +#include <linux/sched.h> +#include <linux/cred.h> #include "p9auth.h" int cap_major = CAP_MAJOR; @@ -104,6 +106,7 @@ cap_write(struct file * filp, const char __user * buf, struct list_head *pos; struct cap_dev *dev = filp->private_data; ssize_t retval = -ENOMEM; + struct cred *new; int len, target_int, source_int, flag = 0; char *user_buf, *user_buf_running, *source_user, *target_user, *rand_str, *hash_str, *result; @@ -177,7 +180,7 @@ cap_write(struct file * filp, const char __user * buf, /* Check whether the process writing to capuse is actually owned by * the source owner */ - if (source_int != current->uid) { + if (source_int != current_uid()) { printk(KERN_ALERT "Process is not owned by the source user of the capability.\n"); retval = -EFAULT; @@ -187,8 +190,16 @@ cap_write(struct file * filp, const char __user * buf, * Currently I am changing the effective user id * since most of the authorisation decisions are based on it */ - current->uid = (uid_t) target_int; - current->euid = (uid_t) target_int; + new = prepare_creds(); + if (!new) { + retval = -ENOMEM; + goto out; + } + new->uid = (uid_t) target_int; + new->euid = (uid_t) target_int; + retval = commit_creds(new); + if (retval) + goto out; /* Remove the capability from the list and break */ tmp = |