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9afc5eee65
Christoph Hellwig suggested a slightly different path for handling backwards compatibility with the 32-bit time_t based system calls: Rather than simply reusing the compat_sys_* entry points on 32-bit architectures unchanged, we get rid of those entry points and the compat_time types by renaming them to something that makes more sense on 32-bit architectures (which don't have a compat mode otherwise), and then share the entry points under the new name with the 64-bit architectures that use them for implementing the compatibility. The following types and interfaces are renamed here, and moved from linux/compat_time.h to linux/time32.h: old new --- --- compat_time_t old_time32_t struct compat_timeval struct old_timeval32 struct compat_timespec struct old_timespec32 struct compat_itimerspec struct old_itimerspec32 ns_to_compat_timeval() ns_to_old_timeval32() get_compat_itimerspec64() get_old_itimerspec32() put_compat_itimerspec64() put_old_itimerspec32() compat_get_timespec64() get_old_timespec32() compat_put_timespec64() put_old_timespec32() As we already have aliases in place, this patch addresses only the instances that are relevant to the system call interface in particular, not those that occur in device drivers and other modules. Those will get handled separately, while providing the 64-bit version of the respective interfaces. I'm not renaming the timex, rusage and itimerval structures, as we are still debating what the new interface will look like, and whether we will need a replacement at all. This also doesn't change the names of the syscall entry points, which can be done more easily when we actually switch over the 32-bit architectures to use them, at that point we need to change COMPAT_SYSCALL_DEFINEx to SYSCALL_DEFINEx with a new name, e.g. with a _time32 suffix. Suggested-by: Christoph Hellwig <hch@infradead.org> Link: https://lore.kernel.org/lkml/20180705222110.GA5698@infradead.org/ Signed-off-by: Arnd Bergmann <arnd@arndb.de>
203 lines
4.5 KiB
C
203 lines
4.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/kernel/futex_compat.c
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*
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* Futex compatibililty routines.
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*
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* Copyright 2006, Red Hat, Inc., Ingo Molnar
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*/
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#include <linux/linkage.h>
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#include <linux/compat.h>
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#include <linux/nsproxy.h>
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#include <linux/futex.h>
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#include <linux/ptrace.h>
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#include <linux/syscalls.h>
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#include <linux/uaccess.h>
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/*
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* Fetch a robust-list pointer. Bit 0 signals PI futexes:
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*/
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static inline int
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fetch_robust_entry(compat_uptr_t *uentry, struct robust_list __user **entry,
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compat_uptr_t __user *head, unsigned int *pi)
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{
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if (get_user(*uentry, head))
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return -EFAULT;
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*entry = compat_ptr((*uentry) & ~1);
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*pi = (unsigned int)(*uentry) & 1;
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return 0;
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}
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static void __user *futex_uaddr(struct robust_list __user *entry,
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compat_long_t futex_offset)
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{
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compat_uptr_t base = ptr_to_compat(entry);
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void __user *uaddr = compat_ptr(base + futex_offset);
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return uaddr;
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}
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/*
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* Walk curr->robust_list (very carefully, it's a userspace list!)
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* and mark any locks found there dead, and notify any waiters.
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*
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* We silently return on any sign of list-walking problem.
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*/
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void compat_exit_robust_list(struct task_struct *curr)
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{
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struct compat_robust_list_head __user *head = curr->compat_robust_list;
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struct robust_list __user *entry, *next_entry, *pending;
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unsigned int limit = ROBUST_LIST_LIMIT, pi, pip;
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unsigned int uninitialized_var(next_pi);
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compat_uptr_t uentry, next_uentry, upending;
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compat_long_t futex_offset;
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int rc;
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if (!futex_cmpxchg_enabled)
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return;
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/*
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* Fetch the list head (which was registered earlier, via
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* sys_set_robust_list()):
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*/
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if (fetch_robust_entry(&uentry, &entry, &head->list.next, &pi))
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return;
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/*
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* Fetch the relative futex offset:
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*/
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if (get_user(futex_offset, &head->futex_offset))
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return;
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/*
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* Fetch any possibly pending lock-add first, and handle it
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* if it exists:
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*/
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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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next_entry = NULL; /* avoid warning with gcc */
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while (entry != (struct robust_list __user *) &head->list) {
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/*
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* Fetch the next entry in the list before calling
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* handle_futex_death:
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*/
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rc = fetch_robust_entry(&next_uentry, &next_entry,
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(compat_uptr_t __user *)&entry->next, &next_pi);
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/*
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* A pending lock might already be on the list, so
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* dont process it twice:
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*/
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if (entry != pending) {
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void __user *uaddr = futex_uaddr(entry, futex_offset);
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if (handle_futex_death(uaddr, curr, pi))
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return;
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}
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if (rc)
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return;
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uentry = next_uentry;
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entry = next_entry;
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pi = next_pi;
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/*
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* Avoid excessively long or circular lists:
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*/
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if (!--limit)
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break;
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cond_resched();
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}
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if (pending) {
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void __user *uaddr = futex_uaddr(pending, futex_offset);
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handle_futex_death(uaddr, curr, pip);
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}
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}
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COMPAT_SYSCALL_DEFINE2(set_robust_list,
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struct compat_robust_list_head __user *, head,
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compat_size_t, len)
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{
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if (!futex_cmpxchg_enabled)
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return -ENOSYS;
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if (unlikely(len != sizeof(*head)))
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return -EINVAL;
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current->compat_robust_list = head;
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return 0;
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}
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COMPAT_SYSCALL_DEFINE3(get_robust_list, int, pid,
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compat_uptr_t __user *, head_ptr,
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compat_size_t __user *, len_ptr)
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{
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struct compat_robust_list_head __user *head;
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unsigned long ret;
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struct task_struct *p;
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if (!futex_cmpxchg_enabled)
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return -ENOSYS;
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rcu_read_lock();
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ret = -ESRCH;
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if (!pid)
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p = current;
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else {
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p = find_task_by_vpid(pid);
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if (!p)
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goto err_unlock;
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}
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ret = -EPERM;
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if (!ptrace_may_access(p, PTRACE_MODE_READ_REALCREDS))
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goto err_unlock;
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head = p->compat_robust_list;
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rcu_read_unlock();
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if (put_user(sizeof(*head), len_ptr))
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return -EFAULT;
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return put_user(ptr_to_compat(head), head_ptr);
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err_unlock:
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rcu_read_unlock();
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return ret;
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}
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COMPAT_SYSCALL_DEFINE6(futex, u32 __user *, uaddr, int, op, u32, val,
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struct old_timespec32 __user *, utime, u32 __user *, uaddr2,
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u32, val3)
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{
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struct timespec ts;
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ktime_t t, *tp = NULL;
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int val2 = 0;
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int cmd = op & FUTEX_CMD_MASK;
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if (utime && (cmd == FUTEX_WAIT || cmd == FUTEX_LOCK_PI ||
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cmd == FUTEX_WAIT_BITSET ||
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cmd == FUTEX_WAIT_REQUEUE_PI)) {
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if (compat_get_timespec(&ts, utime))
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return -EFAULT;
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if (!timespec_valid(&ts))
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return -EINVAL;
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t = timespec_to_ktime(ts);
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if (cmd == FUTEX_WAIT)
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t = ktime_add_safe(ktime_get(), t);
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tp = &t;
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}
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if (cmd == FUTEX_REQUEUE || cmd == FUTEX_CMP_REQUEUE ||
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cmd == FUTEX_CMP_REQUEUE_PI || cmd == FUTEX_WAKE_OP)
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val2 = (int) (unsigned long) utime;
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return do_futex(uaddr, op, val, tp, uaddr2, val2, val3);
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}
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