diff options
Diffstat (limited to 'ipc/shm.c')
| -rw-r--r-- | ipc/shm.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/ipc/shm.c b/ipc/shm.c index dbac8860c721..81203e8ba013 100644 --- a/ipc/shm.c +++ b/ipc/shm.c @@ -89,6 +89,7 @@ void shm_init_ns(struct ipc_namespace *ns) static void do_shm_rmid(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp) { struct shmid_kernel *shp; + shp = container_of(ipcp, struct shmid_kernel, shm_perm); if (shp->shm_nattch) { @@ -387,6 +388,7 @@ static int shm_set_policy(struct vm_area_struct *vma, struct mempolicy *new) struct file *file = vma->vm_file; struct shm_file_data *sfd = shm_file_data(file); int err = 0; + if (sfd->vm_ops->set_policy) err = sfd->vm_ops->set_policy(vma, new); return err; @@ -417,7 +419,7 @@ static int shm_mmap(struct file *file, struct vm_area_struct *vma) * In case of remap_file_pages() emulation, the file can represent * removed IPC ID: propogate shm_lock() error to caller. */ - ret =__shm_open(vma); + ret = __shm_open(vma); if (ret) return ret; @@ -468,6 +470,7 @@ static unsigned long shm_get_unmapped_area(struct file *file, unsigned long flags) { struct shm_file_data *sfd = shm_file_data(file); + return sfd->file->f_op->get_unmapped_area(sfd->file, addr, len, pgoff, flags); } @@ -766,6 +769,7 @@ static void shm_add_rss_swap(struct shmid_kernel *shp, } else { #ifdef CONFIG_SHMEM struct shmem_inode_info *info = SHMEM_I(inode); + spin_lock_irq(&info->lock); *rss_add += inode->i_mapping->nrpages; *swp_add += info->swapped; @@ -1028,6 +1032,7 @@ SYSCALL_DEFINE3(shmctl, int, shmid, int, cmd, struct shmid_ds __user *, buf) if (!ns_capable(ns->user_ns, CAP_IPC_LOCK)) { kuid_t euid = current_euid(); + if (!uid_eq(euid, shp->shm_perm.uid) && !uid_eq(euid, shp->shm_perm.cuid)) { err = -EPERM; @@ -1045,6 +1050,7 @@ SYSCALL_DEFINE3(shmctl, int, shmid, int, cmd, struct shmid_ds __user *, buf) if (cmd == SHM_LOCK) { struct user_struct *user = current_user(); + err = shmem_lock(shm_file, 1, user); if (!err && !(shp->shm_perm.mode & SHM_LOCKED)) { shp->shm_perm.mode |= SHM_LOCKED; @@ -1354,9 +1360,10 @@ SYSCALL_DEFINE1(shmdt, char __user *, shmaddr) vma = next; } -#else /* CONFIG_MMU */ +#else /* CONFIG_MMU */ /* under NOMMU conditions, the exact address to be destroyed must be - * given */ + * given + */ if (vma && vma->vm_start == addr && vma->vm_ops == &shm_vm_ops) { do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start); retval = 0; |