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add error checks to shmctl(SHM_UNLOCK)

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NAKAMURA Gou
2016-03-10 20:50:35 +09:00
parent b73fa2b972
commit 86ac51157c
1 changed files with 10 additions and 1 deletions
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11
kernel/syscall.c
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@ -3965,7 +3965,16 @@ SYSCALL_DECLARE(shmctl)
dkprintf("shmctl(%#x,%d,%p): lookup: %d\n", shmid, cmd, buf, error);
return error;
}
if (obj->ds.shm_perm.mode & SHM_LOCKED) {
if (!has_cap_ipc_lock(thread)
&& (obj->ds.shm_perm.cuid != proc->euid)
&& (obj->ds.shm_perm.uid != proc->euid)) {
shmobj_list_unlock();
dkprintf("shmctl(%#x,%d,%p): perm shm: %d\n", shmid, cmd, buf, error);
return -EPERM;
}
if ((obj->ds.shm_perm.mode & SHM_LOCKED)
&& ((obj->pgshift == 0)
|| (obj->pgshift == PAGE_SHIFT))) {
size = (obj->ds.shm_segsz + PAGE_SIZE - 1) & PAGE_MASK;
shmlock_users_lock();
user = obj->user;