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kernel/futex_compat.c
3.68 KB
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/* * linux/kernel/futex_compat.c * * Futex compatibililty routines. * * Copyright 2006, Red Hat, Inc., Ingo Molnar */ #include <linux/linkage.h> #include <linux/compat.h> #include <linux/futex.h> #include <asm/uaccess.h> |
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/* * Fetch a robust-list pointer. Bit 0 signals PI futexes: */ static inline int fetch_robust_entry(compat_uptr_t *uentry, struct robust_list __user **entry, |
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compat_uptr_t __user *head, int *pi) |
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{ if (get_user(*uentry, head)) return -EFAULT; *entry = compat_ptr((*uentry) & ~1); *pi = (unsigned int)(*uentry) & 1; return 0; } |
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/* * Walk curr->robust_list (very carefully, it's a userspace list!) * and mark any locks found there dead, and notify any waiters. * * We silently return on any sign of list-walking problem. */ void compat_exit_robust_list(struct task_struct *curr) { struct compat_robust_list_head __user *head = curr->compat_robust_list; struct robust_list __user *entry, *pending; |
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unsigned int limit = ROBUST_LIST_LIMIT, pi, pip; |
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compat_uptr_t uentry, upending; |
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compat_long_t futex_offset; /* * Fetch the list head (which was registered earlier, via * sys_set_robust_list()): */ |
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if (fetch_robust_entry(&uentry, &entry, &head->list.next, &pi)) |
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return; |
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/* * Fetch the relative futex offset: */ if (get_user(futex_offset, &head->futex_offset)) return; /* * Fetch any possibly pending lock-add first, and handle it * if it exists: */ |
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if (fetch_robust_entry(&upending, &pending, |
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&head->list_op_pending, &pip)) |
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return; |
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if (upending) |
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handle_futex_death((void __user *)pending + futex_offset, curr, pip); |
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while (compat_ptr(uentry) != &head->list) { /* * A pending lock might already be on the list, so * dont process it twice: */ if (entry != pending) |
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if (handle_futex_death((void __user *)entry + futex_offset, |
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curr, pi)) |
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return; /* * Fetch the next entry in the list: */ |
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if (fetch_robust_entry(&uentry, &entry, |
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(compat_uptr_t __user *)&entry->next, &pi)) |
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return; |
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/* * Avoid excessively long or circular lists: */ if (!--limit) break; cond_resched(); } } asmlinkage long compat_sys_set_robust_list(struct compat_robust_list_head __user *head, compat_size_t len) { if (unlikely(len != sizeof(*head))) return -EINVAL; current->compat_robust_list = head; return 0; } asmlinkage long |
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compat_sys_get_robust_list(int pid, compat_uptr_t __user *head_ptr, |
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compat_size_t __user *len_ptr) { |
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struct compat_robust_list_head __user *head; |
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unsigned long ret; if (!pid) head = current->compat_robust_list; else { struct task_struct *p; ret = -ESRCH; read_lock(&tasklist_lock); p = find_task_by_pid(pid); if (!p) goto err_unlock; ret = -EPERM; if ((current->euid != p->euid) && (current->euid != p->uid) && !capable(CAP_SYS_PTRACE)) goto err_unlock; head = p->compat_robust_list; read_unlock(&tasklist_lock); } if (put_user(sizeof(*head), len_ptr)) return -EFAULT; return put_user(ptr_to_compat(head), head_ptr); err_unlock: read_unlock(&tasklist_lock); return ret; } |
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asmlinkage long compat_sys_futex(u32 __user *uaddr, int op, u32 val, |
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struct compat_timespec __user *utime, u32 __user *uaddr2, |
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u32 val3) |
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{ struct timespec t; unsigned long timeout = MAX_SCHEDULE_TIMEOUT; int val2 = 0; |
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if (utime && (op == FUTEX_WAIT || op == FUTEX_LOCK_PI)) { |
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if (get_compat_timespec(&t, utime)) return -EFAULT; |
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if (!timespec_valid(&t)) return -EINVAL; |
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if (op == FUTEX_WAIT) timeout = timespec_to_jiffies(&t) + 1; else { timeout = t.tv_sec; val2 = t.tv_nsec; } |
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} |
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if (op == FUTEX_REQUEUE || op == FUTEX_CMP_REQUEUE) |
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val2 = (int) (unsigned long) utime; |
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return do_futex(uaddr, op, val, timeout, uaddr2, val2, val3); |
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} |