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-rw-r--r--ipc/mqueue.c19
-rw-r--r--ipc/shm.c9
-rw-r--r--ipc/util.c18
3 files changed, 29 insertions, 17 deletions
diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index 68eb857cfdea..d9393f8e4c3e 100644
--- a/ipc/mqueue.c
+++ b/ipc/mqueue.c
@@ -112,13 +112,14 @@ static inline struct mqueue_inode_info *MQUEUE_I(struct inode *inode)
static struct inode *mqueue_get_inode(struct super_block *sb, int mode,
struct mq_attr *attr)
{
+ struct user_struct *u = current_user();
struct inode *inode;
inode = new_inode(sb);
if (inode) {
inode->i_mode = mode;
- inode->i_uid = current->fsuid;
- inode->i_gid = current->fsgid;
+ inode->i_uid = current_fsuid();
+ inode->i_gid = current_fsgid();
inode->i_blocks = 0;
inode->i_mtime = inode->i_ctime = inode->i_atime =
CURRENT_TIME;
@@ -126,7 +127,6 @@ static struct inode *mqueue_get_inode(struct super_block *sb, int mode,
if (S_ISREG(mode)) {
struct mqueue_inode_info *info;
struct task_struct *p = current;
- struct user_struct *u = p->user;
unsigned long mq_bytes, mq_msg_tblsz;
inode->i_fop = &mqueue_file_operations;
@@ -507,7 +507,7 @@ static void __do_notify(struct mqueue_inode_info *info)
sig_i.si_code = SI_MESGQ;
sig_i.si_value = info->notify.sigev_value;
sig_i.si_pid = task_tgid_vnr(current);
- sig_i.si_uid = current->uid;
+ sig_i.si_uid = current_uid();
kill_pid_info(info->notify.sigev_signo,
&sig_i, info->notify_owner);
@@ -594,6 +594,7 @@ static int mq_attr_ok(struct mq_attr *attr)
static struct file *do_create(struct dentry *dir, struct dentry *dentry,
int oflag, mode_t mode, struct mq_attr __user *u_attr)
{
+ const struct cred *cred = current_cred();
struct mq_attr attr;
struct file *result;
int ret;
@@ -618,7 +619,7 @@ static struct file *do_create(struct dentry *dir, struct dentry *dentry,
if (ret)
goto out_drop_write;
- result = dentry_open(dentry, mqueue_mnt, oflag);
+ result = dentry_open(dentry, mqueue_mnt, oflag, cred);
/*
* dentry_open() took a persistent mnt_want_write(),
* so we can now drop this one.
@@ -637,8 +638,10 @@ out:
/* Opens existing queue */
static struct file *do_open(struct dentry *dentry, int oflag)
{
-static int oflag2acc[O_ACCMODE] = { MAY_READ, MAY_WRITE,
- MAY_READ | MAY_WRITE };
+ const struct cred *cred = current_cred();
+
+ static const int oflag2acc[O_ACCMODE] = { MAY_READ, MAY_WRITE,
+ MAY_READ | MAY_WRITE };
if ((oflag & O_ACCMODE) == (O_RDWR | O_WRONLY)) {
dput(dentry);
@@ -652,7 +655,7 @@ static int oflag2acc[O_ACCMODE] = { MAY_READ, MAY_WRITE,
return ERR_PTR(-EACCES);
}
- return dentry_open(dentry, mqueue_mnt, oflag);
+ return dentry_open(dentry, mqueue_mnt, oflag, cred);
}
asmlinkage long sys_mq_open(const char __user *u_name, int oflag, mode_t mode,
diff --git a/ipc/shm.c b/ipc/shm.c
index 867e5d6a55c2..38a055758a9b 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -366,7 +366,7 @@ static int newseg(struct ipc_namespace *ns, struct ipc_params *params)
if (shmflg & SHM_HUGETLB) {
/* hugetlb_file_setup takes care of mlock user accounting */
file = hugetlb_file_setup(name, size);
- shp->mlock_user = current->user;
+ shp->mlock_user = current_user();
} else {
int acctflag = VM_ACCOUNT;
/*
@@ -752,9 +752,10 @@ asmlinkage long sys_shmctl(int shmid, int cmd, struct shmid_ds __user *buf)
goto out_unlock;
if (!capable(CAP_IPC_LOCK)) {
+ uid_t euid = current_euid();
err = -EPERM;
- if (current->euid != shp->shm_perm.uid &&
- current->euid != shp->shm_perm.cuid)
+ if (euid != shp->shm_perm.uid &&
+ euid != shp->shm_perm.cuid)
goto out_unlock;
if (cmd == SHM_LOCK &&
!current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur)
@@ -766,7 +767,7 @@ asmlinkage long sys_shmctl(int shmid, int cmd, struct shmid_ds __user *buf)
goto out_unlock;
if(cmd==SHM_LOCK) {
- struct user_struct * user = current->user;
+ struct user_struct *user = current_user();
if (!is_file_hugepages(shp->shm_file)) {
err = shmem_lock(shp->shm_file, 1, user);
if (!err && !(shp->shm_perm.mode & SHM_LOCKED)){
diff --git a/ipc/util.c b/ipc/util.c
index 361fd1c96fcf..5a1808c774a2 100644
--- a/ipc/util.c
+++ b/ipc/util.c
@@ -258,6 +258,8 @@ int ipc_get_maxid(struct ipc_ids *ids)
int ipc_addid(struct ipc_ids* ids, struct kern_ipc_perm* new, int size)
{
+ uid_t euid;
+ gid_t egid;
int id, err;
if (size > IPCMNI)
@@ -280,8 +282,9 @@ int ipc_addid(struct ipc_ids* ids, struct kern_ipc_perm* new, int size)
ids->in_use++;
- new->cuid = new->uid = current->euid;
- new->gid = new->cgid = current->egid;
+ current_euid_egid(&euid, &egid);
+ new->cuid = new->uid = euid;
+ new->gid = new->cgid = egid;
new->seq = ids->seq++;
if(ids->seq > ids->seq_max)
@@ -620,13 +623,15 @@ void ipc_rcu_putref(void *ptr)
int ipcperms (struct kern_ipc_perm *ipcp, short flag)
{ /* flag will most probably be 0 or S_...UGO from <linux/stat.h> */
+ uid_t euid = current_euid();
int requested_mode, granted_mode, err;
if (unlikely((err = audit_ipc_obj(ipcp))))
return err;
requested_mode = (flag >> 6) | (flag >> 3) | flag;
granted_mode = ipcp->mode;
- if (current->euid == ipcp->cuid || current->euid == ipcp->uid)
+ if (euid == ipcp->cuid ||
+ euid == ipcp->uid)
granted_mode >>= 6;
else if (in_group_p(ipcp->cgid) || in_group_p(ipcp->gid))
granted_mode >>= 3;
@@ -788,6 +793,7 @@ struct kern_ipc_perm *ipcctl_pre_down(struct ipc_ids *ids, int id, int cmd,
struct ipc64_perm *perm, int extra_perm)
{
struct kern_ipc_perm *ipcp;
+ uid_t euid;
int err;
down_write(&ids->rw_mutex);
@@ -807,8 +813,10 @@ struct kern_ipc_perm *ipcctl_pre_down(struct ipc_ids *ids, int id, int cmd,
if (err)
goto out_unlock;
}
- if (current->euid == ipcp->cuid ||
- current->euid == ipcp->uid || capable(CAP_SYS_ADMIN))
+
+ euid = current_euid();
+ if (euid == ipcp->cuid ||
+ euid == ipcp->uid || capable(CAP_SYS_ADMIN))
return ipcp;
err = -EPERM;
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.