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fs/select.c
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// SPDX-License-Identifier: GPL-2.0 |
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/* * This file contains the procedures for the handling of select and poll * * Created for Linux based loosely upon Mathius Lattner's minix * patches by Peter MacDonald. Heavily edited by Linus. * * 4 February 1994 * COFF/ELF binary emulation. If the process has the STICKY_TIMEOUTS * flag set in its personality we do *not* modify the given timeout * parameter to reflect time remaining. * * 24 January 2000 * Changed sys_poll()/do_poll() to use PAGE_SIZE chunk-based allocation * of fds to overcome nfds < 16390 descriptors limit (Tigran Aivazian). */ |
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#include <linux/kernel.h> |
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#include <linux/sched/signal.h> #include <linux/sched/rt.h> |
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#include <linux/syscalls.h> |
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#include <linux/export.h> |
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#include <linux/slab.h> |
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#include <linux/poll.h> #include <linux/personality.h> /* for STICKY_TIMEOUTS */ #include <linux/file.h> |
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#include <linux/fdtable.h> |
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#include <linux/fs.h> |
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#include <linux/rcupdate.h> |
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#include <linux/hrtimer.h> |
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#include <linux/freezer.h> |
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#include <net/busy_poll.h> |
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#include <linux/vmalloc.h> |
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|
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#include <linux/uaccess.h> |
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/* * Estimate expected accuracy in ns from a timeval. * * After quite a bit of churning around, we've settled on * a simple thing of taking 0.1% of the timeout as the * slack, with a cap of 100 msec. * "nice" tasks get a 0.5% slack instead. * * Consider this comment an open invitation to come up with even * better solutions.. */ |
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#define MAX_SLACK (100 * NSEC_PER_MSEC) |
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static long __estimate_accuracy(struct timespec64 *tv) |
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{ |
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long slack; |
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int divfactor = 1000; |
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if (tv->tv_sec < 0) return 0; |
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if (task_nice(current) > 0) |
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divfactor = divfactor / 5; |
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if (tv->tv_sec > MAX_SLACK / (NSEC_PER_SEC/divfactor)) return MAX_SLACK; |
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slack = tv->tv_nsec / divfactor; slack += tv->tv_sec * (NSEC_PER_SEC/divfactor); |
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if (slack > MAX_SLACK) return MAX_SLACK; |
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|
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return slack; } |
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u64 select_estimate_accuracy(struct timespec64 *tv) |
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{ |
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u64 ret; |
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struct timespec64 now; |
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/* * Realtime tasks get a slack of 0 for obvious reasons. */ |
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if (rt_task(current)) |
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return 0; |
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ktime_get_ts64(&now); now = timespec64_sub(*tv, now); |
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ret = __estimate_accuracy(&now); if (ret < current->timer_slack_ns) return current->timer_slack_ns; return ret; } |
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struct poll_table_page { struct poll_table_page * next; struct poll_table_entry * entry; struct poll_table_entry entries[0]; }; #define POLL_TABLE_FULL(table) \ ((unsigned long)((table)->entry+1) > PAGE_SIZE + (unsigned long)(table)) /* * Ok, Peter made a complicated, but straightforward multiple_wait() function. * I have rewritten this, taking some shortcuts: This code may not be easy to * follow, but it should be free of race-conditions, and it's practical. If you * understand what I'm doing here, then you understand how the linux * sleep/wakeup mechanism works. * * Two very simple procedures, poll_wait() and poll_freewait() make all the * work. poll_wait() is an inline-function defined in <linux/poll.h>, * as all select/poll functions have to call it to add an entry to the * poll table. */ |
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static void __pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p); |
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void poll_initwait(struct poll_wqueues *pwq) { init_poll_funcptr(&pwq->pt, __pollwait); |
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pwq->polling_task = current; |
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pwq->triggered = 0; |
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pwq->error = 0; pwq->table = NULL; |
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pwq->inline_index = 0; |
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} |
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EXPORT_SYMBOL(poll_initwait); |
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static void free_poll_entry(struct poll_table_entry *entry) { |
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remove_wait_queue(entry->wait_address, &entry->wait); |
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fput(entry->filp); } |
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void poll_freewait(struct poll_wqueues *pwq) { struct poll_table_page * p = pwq->table; |
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int i; for (i = 0; i < pwq->inline_index; i++) free_poll_entry(pwq->inline_entries + i); |
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while (p) { struct poll_table_entry * entry; struct poll_table_page *old; entry = p->entry; do { entry--; |
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free_poll_entry(entry); |
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} while (entry > p->entries); old = p; p = p->next; free_page((unsigned long) old); } } |
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EXPORT_SYMBOL(poll_freewait); |
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static struct poll_table_entry *poll_get_entry(struct poll_wqueues *p) |
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{ |
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struct poll_table_page *table = p->table; |
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if (p->inline_index < N_INLINE_POLL_ENTRIES) return p->inline_entries + p->inline_index++; |
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if (!table || POLL_TABLE_FULL(table)) { struct poll_table_page *new_table; new_table = (struct poll_table_page *) __get_free_page(GFP_KERNEL); if (!new_table) { p->error = -ENOMEM; |
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return NULL; |
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} new_table->entry = new_table->entries; new_table->next = table; p->table = new_table; table = new_table; } |
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return table->entry++; } |
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static int __pollwake(wait_queue_entry_t *wait, unsigned mode, int sync, void *key) |
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{ struct poll_wqueues *pwq = wait->private; DECLARE_WAITQUEUE(dummy_wait, pwq->polling_task); /* * Although this function is called under waitqueue lock, LOCK * doesn't imply write barrier and the users expect write * barrier semantics on wakeup functions. The following * smp_wmb() is equivalent to smp_wmb() in try_to_wake_up() |
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* and is paired with smp_store_mb() in poll_schedule_timeout. |
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*/ smp_wmb(); pwq->triggered = 1; /* * Perform the default wake up operation using a dummy * waitqueue. * * TODO: This is hacky but there currently is no interface to * pass in @sync. @sync is scheduled to be removed and once * that happens, wake_up_process() can be used directly. */ return default_wake_function(&dummy_wait, mode, sync, key); } |
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static int pollwake(wait_queue_entry_t *wait, unsigned mode, int sync, void *key) |
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{ struct poll_table_entry *entry; entry = container_of(wait, struct poll_table_entry, wait); |
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if (key && !(key_to_poll(key) & entry->key)) |
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return 0; return __pollwake(wait, mode, sync, key); } |
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/* Add a new entry */ static void __pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p) { |
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struct poll_wqueues *pwq = container_of(p, struct poll_wqueues, pt); struct poll_table_entry *entry = poll_get_entry(pwq); |
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if (!entry) return; |
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entry->filp = get_file(filp); |
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entry->wait_address = wait_address; |
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entry->key = p->_key; |
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init_waitqueue_func_entry(&entry->wait, pollwake); entry->wait.private = pwq; |
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add_wait_queue(wait_address, &entry->wait); |
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} |
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static int poll_schedule_timeout(struct poll_wqueues *pwq, int state, |
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ktime_t *expires, unsigned long slack) { int rc = -EINTR; set_current_state(state); if (!pwq->triggered) |
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rc = schedule_hrtimeout_range(expires, slack, HRTIMER_MODE_ABS); |
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__set_current_state(TASK_RUNNING); /* * Prepare for the next iteration. * |
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* The following smp_store_mb() serves two purposes. First, it's |
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* the counterpart rmb of the wmb in pollwake() such that data * written before wake up is always visible after wake up. * Second, the full barrier guarantees that triggered clearing * doesn't pass event check of the next iteration. Note that * this problem doesn't exist for the first iteration as * add_wait_queue() has full barrier semantics. */ |
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smp_store_mb(pwq->triggered, 0); |
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return rc; } |
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/** * poll_select_set_timeout - helper function to setup the timeout value |
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* @to: pointer to timespec64 variable for the final timeout |
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* @sec: seconds (from user space) * @nsec: nanoseconds (from user space) * * Note, we do not use a timespec for the user space value here, That * way we can use the function for timeval and compat interfaces as well. * * Returns -EINVAL if sec/nsec are not normalized. Otherwise 0. */ |
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int poll_select_set_timeout(struct timespec64 *to, time64_t sec, long nsec) |
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{ |
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struct timespec64 ts = {.tv_sec = sec, .tv_nsec = nsec}; |
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if (!timespec64_valid(&ts)) |
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return -EINVAL; /* Optimize for the zero timeout value here */ if (!sec && !nsec) { to->tv_sec = to->tv_nsec = 0; } else { |
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ktime_get_ts64(to); *to = timespec64_add_safe(*to, ts); |
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} return 0; } |
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enum poll_time_type { PT_TIMEVAL = 0, PT_OLD_TIMEVAL = 1, PT_TIMESPEC = 2, PT_OLD_TIMESPEC = 3, }; |
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static int poll_select_finish(struct timespec64 *end_time, void __user *p, enum poll_time_type pt_type, int ret) |
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{ |
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struct timespec64 rts; |
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|
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restore_saved_sigmask_unless(ret == -ERESTARTNOHAND); |
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if (!p) return ret; if (current->personality & STICKY_TIMEOUTS) goto sticky; /* No update for zero timeout */ if (!end_time->tv_sec && !end_time->tv_nsec) return ret; |
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ktime_get_ts64(&rts); rts = timespec64_sub(*end_time, rts); if (rts.tv_sec < 0) rts.tv_sec = rts.tv_nsec = 0; |
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switch (pt_type) { case PT_TIMEVAL: { |
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struct __kernel_old_timeval rtv; |
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if (sizeof(rtv) > sizeof(rtv.tv_sec) + sizeof(rtv.tv_usec)) memset(&rtv, 0, sizeof(rtv)); rtv.tv_sec = rts.tv_sec; rtv.tv_usec = rts.tv_nsec / NSEC_PER_USEC; if (!copy_to_user(p, &rtv, sizeof(rtv))) return ret; } break; case PT_OLD_TIMEVAL: { struct old_timeval32 rtv; rtv.tv_sec = rts.tv_sec; rtv.tv_usec = rts.tv_nsec / NSEC_PER_USEC; if (!copy_to_user(p, &rtv, sizeof(rtv))) return ret; } break; case PT_TIMESPEC: if (!put_timespec64(&rts, p)) |
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return ret; |
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break; case PT_OLD_TIMESPEC: if (!put_old_timespec32(&rts, p)) return ret; break; default: BUG(); } |
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/* * If an application puts its timeval in read-only memory, we * don't want the Linux-specific update to the timeval to * cause a fault after the select has completed * successfully. However, because we're not updating the * timeval, we can't restart the system call. */ sticky: if (ret == -ERESTARTNOHAND) ret = -EINTR; return ret; } |
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/* * Scalable version of the fd_set. */ typedef struct { unsigned long *in, *out, *ex; unsigned long *res_in, *res_out, *res_ex; } fd_set_bits; /* * How many longwords for "nr" bits? */ #define FDS_BITPERLONG (8*sizeof(long)) #define FDS_LONGS(nr) (((nr)+FDS_BITPERLONG-1)/FDS_BITPERLONG) #define FDS_BYTES(nr) (FDS_LONGS(nr)*sizeof(long)) /* |
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* Use "unsigned long" accesses to let user-mode fd_set's be long-aligned. */ static inline int get_fd_set(unsigned long nr, void __user *ufdset, unsigned long *fdset) { nr = FDS_BYTES(nr); if (ufdset) return copy_from_user(fdset, ufdset, nr) ? -EFAULT : 0; memset(fdset, 0, nr); return 0; } static inline unsigned long __must_check set_fd_set(unsigned long nr, void __user *ufdset, unsigned long *fdset) { if (ufdset) return __copy_to_user(ufdset, fdset, FDS_BYTES(nr)); return 0; } static inline void zero_fd_set(unsigned long nr, unsigned long *fdset) { memset(fdset, 0, FDS_BYTES(nr)); } |
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#define FDS_IN(fds, n) (fds->in + n) #define FDS_OUT(fds, n) (fds->out + n) #define FDS_EX(fds, n) (fds->ex + n) #define BITS(fds, n) (*FDS_IN(fds, n)|*FDS_OUT(fds, n)|*FDS_EX(fds, n)) static int max_select_fd(unsigned long n, fd_set_bits *fds) { unsigned long *open_fds; unsigned long set; int max; |
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struct fdtable *fdt; |
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/* handle last in-complete long-word first */ |
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set = ~(~0UL << (n & (BITS_PER_LONG-1))); n /= BITS_PER_LONG; |
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fdt = files_fdtable(current->files); |
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open_fds = fdt->open_fds + n; |
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max = 0; if (set) { set &= BITS(fds, n); if (set) { if (!(set & ~*open_fds)) goto get_max; return -EBADF; } } while (n) { open_fds--; n--; set = BITS(fds, n); if (!set) continue; if (set & ~*open_fds) return -EBADF; if (max) continue; get_max: do { max++; set >>= 1; } while (set); |
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max += n * BITS_PER_LONG; |
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} return max; } |
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#define POLLIN_SET (EPOLLRDNORM | EPOLLRDBAND | EPOLLIN | EPOLLHUP | EPOLLERR) #define POLLOUT_SET (EPOLLWRBAND | EPOLLWRNORM | EPOLLOUT | EPOLLERR) #define POLLEX_SET (EPOLLPRI) |
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|
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static inline void wait_key_set(poll_table *wait, unsigned long in, |
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unsigned long out, unsigned long bit, |
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__poll_t ll_flag) |
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{ |
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wait->_key = POLLEX_SET | ll_flag; |
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if (in & bit) wait->_key |= POLLIN_SET; if (out & bit) wait->_key |= POLLOUT_SET; |
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} |
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static int do_select(int n, fd_set_bits *fds, struct timespec64 *end_time) |
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{ |
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ktime_t expire, *to = NULL; |
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struct poll_wqueues table; poll_table *wait; |
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int retval, i, timed_out = 0; |
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u64 slack = 0; |
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__poll_t busy_flag = net_busy_loop_on() ? POLL_BUSY_LOOP : 0; |
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unsigned long busy_start = 0; |
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|
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rcu_read_lock(); |
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retval = max_select_fd(n, fds); |
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rcu_read_unlock(); |
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if (retval < 0) return retval; n = retval; poll_initwait(&table); wait = &table.pt; |
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if (end_time && !end_time->tv_sec && !end_time->tv_nsec) { |
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wait->_qproc = NULL; |
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timed_out = 1; } |
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if (end_time && !timed_out) |
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slack = select_estimate_accuracy(end_time); |
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|
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retval = 0; for (;;) { unsigned long *rinp, *routp, *rexp, *inp, *outp, *exp; |
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bool can_busy_loop = false; |
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1da177e4c Linux-2.6.12-rc2 |
476 477 478 479 |
inp = fds->in; outp = fds->out; exp = fds->ex; rinp = fds->res_in; routp = fds->res_out; rexp = fds->res_ex; for (i = 0; i < n; ++rinp, ++routp, ++rexp) { |
e6c8adca2 anntotate the pla... |
480 |
unsigned long in, out, ex, all_bits, bit = 1, j; |
1da177e4c Linux-2.6.12-rc2 |
481 |
unsigned long res_in = 0, res_out = 0, res_ex = 0; |
e6c8adca2 anntotate the pla... |
482 |
__poll_t mask; |
1da177e4c Linux-2.6.12-rc2 |
483 484 485 486 |
in = *inp++; out = *outp++; ex = *exp++; all_bits = in | out | ex; if (all_bits == 0) { |
8ded2bbc1 posix_types.h: Cl... |
487 |
i += BITS_PER_LONG; |
1da177e4c Linux-2.6.12-rc2 |
488 489 |
continue; } |
8ded2bbc1 posix_types.h: Cl... |
490 |
for (j = 0; j < BITS_PER_LONG; ++j, ++i, bit <<= 1) { |
2903ff019 switch simple cas... |
491 |
struct fd f; |
1da177e4c Linux-2.6.12-rc2 |
492 493 494 495 |
if (i >= n) break; if (!(bit & all_bits)) continue; |
2903ff019 switch simple cas... |
496 497 |
f = fdget(i); if (f.file) { |
9965ed174 fs: add new vfs_p... |
498 499 500 |
wait_key_set(wait, in, out, bit, busy_flag); mask = vfs_poll(f.file, wait); |
2903ff019 switch simple cas... |
501 |
fdput(f); |
1da177e4c Linux-2.6.12-rc2 |
502 503 504 |
if ((mask & POLLIN_SET) && (in & bit)) { res_in |= bit; retval++; |
626cf2366 poll: add poll_re... |
505 |
wait->_qproc = NULL; |
1da177e4c Linux-2.6.12-rc2 |
506 507 508 509 |
} if ((mask & POLLOUT_SET) && (out & bit)) { res_out |= bit; retval++; |
626cf2366 poll: add poll_re... |
510 |
wait->_qproc = NULL; |
1da177e4c Linux-2.6.12-rc2 |
511 512 513 514 |
} if ((mask & POLLEX_SET) && (ex & bit)) { res_ex |= bit; retval++; |
626cf2366 poll: add poll_re... |
515 |
wait->_qproc = NULL; |
1da177e4c Linux-2.6.12-rc2 |
516 |
} |
2d48d67fa net: poll/select ... |
517 |
/* got something, stop busy polling */ |
cbf55001b net: rename low l... |
518 519 520 521 522 523 524 525 526 527 |
if (retval) { can_busy_loop = false; busy_flag = 0; /* * only remember a returned * POLL_BUSY_LOOP if we asked for it */ } else if (busy_flag & mask) can_busy_loop = true; |
1da177e4c Linux-2.6.12-rc2 |
528 |
} |
1da177e4c Linux-2.6.12-rc2 |
529 530 531 532 533 534 535 |
} if (res_in) *rinp = res_in; if (res_out) *routp = res_out; if (res_ex) *rexp = res_ex; |
55d853849 Fix performance r... |
536 |
cond_resched(); |
1da177e4c Linux-2.6.12-rc2 |
537 |
} |
626cf2366 poll: add poll_re... |
538 |
wait->_qproc = NULL; |
8ff3e8e85 select: switch se... |
539 |
if (retval || timed_out || signal_pending(current)) |
1da177e4c Linux-2.6.12-rc2 |
540 |
break; |
f5264481c trivial: small cl... |
541 |
if (table.error) { |
1da177e4c Linux-2.6.12-rc2 |
542 543 544 |
retval = table.error; break; } |
9f72949f6 [PATCH] Add psele... |
545 |
|
cbf55001b net: rename low l... |
546 |
/* only if found POLL_BUSY_LOOP sockets && not out of time */ |
76b1e9b98 net/fs: change bu... |
547 |
if (can_busy_loop && !need_resched()) { |
37056719b net: Track start ... |
548 549 |
if (!busy_start) { busy_start = busy_loop_current_time(); |
76b1e9b98 net/fs: change bu... |
550 551 |
continue; } |
37056719b net: Track start ... |
552 |
if (!busy_loop_timeout(busy_start)) |
76b1e9b98 net/fs: change bu... |
553 554 555 |
continue; } busy_flag = 0; |
2d48d67fa net: poll/select ... |
556 |
|
8ff3e8e85 select: switch se... |
557 558 559 560 561 562 |
/* * If this is the first loop and we have a timeout * given, then we convert to ktime_t and set the to * pointer to the expiry value. */ if (end_time && !to) { |
766b9f928 fs: poll/select/r... |
563 |
expire = timespec64_to_ktime(*end_time); |
8ff3e8e85 select: switch se... |
564 |
to = &expire; |
9f72949f6 [PATCH] Add psele... |
565 |
} |
8ff3e8e85 select: switch se... |
566 |
|
5f820f648 poll: allow f_op-... |
567 568 |
if (!poll_schedule_timeout(&table, TASK_INTERRUPTIBLE, to, slack)) |
8ff3e8e85 select: switch se... |
569 |
timed_out = 1; |
1da177e4c Linux-2.6.12-rc2 |
570 |
} |
1da177e4c Linux-2.6.12-rc2 |
571 572 |
poll_freewait(&table); |
1da177e4c Linux-2.6.12-rc2 |
573 574 |
return retval; } |
1da177e4c Linux-2.6.12-rc2 |
575 576 577 578 579 580 581 582 |
/* * We can actually return ERESTARTSYS instead of EINTR, but I'd * like to be certain this leads to no problems. So I return * EINTR just for safety. * * Update: ERESTARTSYS breaks at least the xview clock binary, so * I'm trying ERESTARTNOHAND which restart only when you want to. */ |
a2dcb44c3 [PATCH] make osf_... |
583 |
int core_sys_select(int n, fd_set __user *inp, fd_set __user *outp, |
766b9f928 fs: poll/select/r... |
584 |
fd_set __user *exp, struct timespec64 *end_time) |
1da177e4c Linux-2.6.12-rc2 |
585 586 |
{ fd_set_bits fds; |
29ff2db55 [PATCH] select() ... |
587 |
void *bits; |
bbea9f696 [PATCH] fdtable: ... |
588 |
int ret, max_fds; |
2d19309cf fs/select: add vm... |
589 |
size_t size, alloc_size; |
badf16621 [PATCH] files: br... |
590 |
struct fdtable *fdt; |
70674f95c [PATCH] Optimize ... |
591 |
/* Allocate small arguments on the stack to save memory and be faster */ |
30c14e40e [PATCH] avoid una... |
592 |
long stack_fds[SELECT_STACK_ALLOC/sizeof(long)]; |
1da177e4c Linux-2.6.12-rc2 |
593 |
|
1da177e4c Linux-2.6.12-rc2 |
594 595 596 |
ret = -EINVAL; if (n < 0) goto out_nofds; |
bbea9f696 [PATCH] fdtable: ... |
597 |
/* max_fds can increase, so grab it once to avoid race */ |
b835996f6 [PATCH] files: lo... |
598 |
rcu_read_lock(); |
badf16621 [PATCH] files: br... |
599 |
fdt = files_fdtable(current->files); |
bbea9f696 [PATCH] fdtable: ... |
600 |
max_fds = fdt->max_fds; |
b835996f6 [PATCH] files: lo... |
601 |
rcu_read_unlock(); |
bbea9f696 [PATCH] fdtable: ... |
602 603 |
if (n > max_fds) n = max_fds; |
1da177e4c Linux-2.6.12-rc2 |
604 605 606 607 608 609 |
/* * We need 6 bitmaps (in/out/ex for both incoming and outgoing), * since we used fdset we need to allocate memory in units of * long-words. */ |
1da177e4c Linux-2.6.12-rc2 |
610 |
size = FDS_BYTES(n); |
b04eb6aa0 [PATCH] select: d... |
611 612 613 614 |
bits = stack_fds; if (size > sizeof(stack_fds) / 6) { /* Not enough space in on-stack array; must use kmalloc */ ret = -ENOMEM; |
2d19309cf fs/select: add vm... |
615 616 617 618 |
if (size > (SIZE_MAX / 6)) goto out_nofds; alloc_size = 6 * size; |
752ade68c treewide: use kv[... |
619 |
bits = kvmalloc(alloc_size, GFP_KERNEL); |
b04eb6aa0 [PATCH] select: d... |
620 621 622 |
if (!bits) goto out_nofds; } |
29ff2db55 [PATCH] select() ... |
623 624 625 626 627 628 |
fds.in = bits; fds.out = bits + size; fds.ex = bits + 2*size; fds.res_in = bits + 3*size; fds.res_out = bits + 4*size; fds.res_ex = bits + 5*size; |
1da177e4c Linux-2.6.12-rc2 |
629 630 631 632 633 634 635 636 |
if ((ret = get_fd_set(n, inp, fds.in)) || (ret = get_fd_set(n, outp, fds.out)) || (ret = get_fd_set(n, exp, fds.ex))) goto out; zero_fd_set(n, fds.res_in); zero_fd_set(n, fds.res_out); zero_fd_set(n, fds.res_ex); |
8ff3e8e85 select: switch se... |
637 |
ret = do_select(n, &fds, end_time); |
1da177e4c Linux-2.6.12-rc2 |
638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 |
if (ret < 0) goto out; if (!ret) { ret = -ERESTARTNOHAND; if (signal_pending(current)) goto out; ret = 0; } if (set_fd_set(n, inp, fds.res_in) || set_fd_set(n, outp, fds.res_out) || set_fd_set(n, exp, fds.res_ex)) ret = -EFAULT; out: |
70674f95c [PATCH] Optimize ... |
654 |
if (bits != stack_fds) |
2d19309cf fs/select: add vm... |
655 |
kvfree(bits); |
1da177e4c Linux-2.6.12-rc2 |
656 657 658 |
out_nofds: return ret; } |
4bdb9acab fs: add kern_sele... |
659 |
static int kern_select(int n, fd_set __user *inp, fd_set __user *outp, |
75d319c06 y2038: syscalls: ... |
660 |
fd_set __user *exp, struct __kernel_old_timeval __user *tvp) |
9f72949f6 [PATCH] Add psele... |
661 |
{ |
766b9f928 fs: poll/select/r... |
662 |
struct timespec64 end_time, *to = NULL; |
75d319c06 y2038: syscalls: ... |
663 |
struct __kernel_old_timeval tv; |
9f72949f6 [PATCH] Add psele... |
664 665 666 667 668 |
int ret; if (tvp) { if (copy_from_user(&tv, tvp, sizeof(tv))) return -EFAULT; |
8ff3e8e85 select: switch se... |
669 |
to = &end_time; |
4d36a9e65 select: deal with... |
670 671 672 |
if (poll_select_set_timeout(to, tv.tv_sec + (tv.tv_usec / USEC_PER_SEC), (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC)) |
9f72949f6 [PATCH] Add psele... |
673 |
return -EINVAL; |
9f72949f6 [PATCH] Add psele... |
674 |
} |
8ff3e8e85 select: switch se... |
675 |
ret = core_sys_select(n, inp, outp, exp, to); |
ac3010206 select: shift res... |
676 |
return poll_select_finish(&end_time, tvp, PT_TIMEVAL, ret); |
9f72949f6 [PATCH] Add psele... |
677 |
} |
4bdb9acab fs: add kern_sele... |
678 |
SYSCALL_DEFINE5(select, int, n, fd_set __user *, inp, fd_set __user *, outp, |
75d319c06 y2038: syscalls: ... |
679 |
fd_set __user *, exp, struct __kernel_old_timeval __user *, tvp) |
4bdb9acab fs: add kern_sele... |
680 681 682 |
{ return kern_select(n, inp, outp, exp, tvp); } |
c9da9f212 [CVE-2009-0029] M... |
683 |
static long do_pselect(int n, fd_set __user *inp, fd_set __user *outp, |
e024707bc pselect6: use __k... |
684 685 686 |
fd_set __user *exp, void __user *tsp, const sigset_t __user *sigmask, size_t sigsetsize, enum poll_time_type type) |
9f72949f6 [PATCH] Add psele... |
687 |
{ |
36819ad09 select: Use get/p... |
688 |
struct timespec64 ts, end_time, *to = NULL; |
9f72949f6 [PATCH] Add psele... |
689 690 691 |
int ret; if (tsp) { |
e024707bc pselect6: use __k... |
692 693 694 695 696 697 698 699 700 701 702 703 |
switch (type) { case PT_TIMESPEC: if (get_timespec64(&ts, tsp)) return -EFAULT; break; case PT_OLD_TIMESPEC: if (get_old_timespec32(&ts, tsp)) return -EFAULT; break; default: BUG(); } |
9f72949f6 [PATCH] Add psele... |
704 |
|
8ff3e8e85 select: switch se... |
705 |
to = &end_time; |
36819ad09 select: Use get/p... |
706 |
if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec)) |
9f72949f6 [PATCH] Add psele... |
707 |
return -EINVAL; |
9f72949f6 [PATCH] Add psele... |
708 |
} |
b772434be signal: simplify ... |
709 |
ret = set_user_sigmask(sigmask, sigsetsize); |
ded653ccb signal: Add set_u... |
710 711 |
if (ret) return ret; |
9f72949f6 [PATCH] Add psele... |
712 |
|
62568510b Fix timeouts in s... |
713 |
ret = core_sys_select(n, inp, outp, exp, to); |
ac3010206 select: shift res... |
714 |
return poll_select_finish(&end_time, tsp, type, ret); |
9f72949f6 [PATCH] Add psele... |
715 716 717 718 719 720 721 722 |
} /* * Most architectures can't handle 7-argument syscalls. So we provide a * 6-argument version where the sixth argument is a pointer to a structure * which has a pointer to the sigset_t itself followed by a size_t containing * the sigset size. */ |
7e71609f6 pselect6() and fr... |
723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 |
struct sigset_argpack { sigset_t __user *p; size_t size; }; static inline int get_sigset_argpack(struct sigset_argpack *to, struct sigset_argpack __user *from) { // the path is hot enough for overhead of copy_from_user() to matter if (from) { if (!user_read_access_begin(from, sizeof(*from))) return -EFAULT; unsafe_get_user(to->p, &from->p, Efault); unsafe_get_user(to->size, &from->size, Efault); user_read_access_end(); } return 0; Efault: user_access_end(); return -EFAULT; } |
d4e82042c [CVE-2009-0029] S... |
744 |
SYSCALL_DEFINE6(pselect6, int, n, fd_set __user *, inp, fd_set __user *, outp, |
e024707bc pselect6: use __k... |
745 746 747 |
fd_set __user *, exp, struct __kernel_timespec __user *, tsp, void __user *, sig) { |
7e71609f6 pselect6() and fr... |
748 749 750 751 |
struct sigset_argpack x = {NULL, 0}; if (get_sigset_argpack(&x, sig)) return -EFAULT; |
e024707bc pselect6: use __k... |
752 |
|
7e71609f6 pselect6() and fr... |
753 |
return do_pselect(n, inp, outp, exp, tsp, x.p, x.size, PT_TIMESPEC); |
e024707bc pselect6: use __k... |
754 755 756 757 758 759 |
} #if defined(CONFIG_COMPAT_32BIT_TIME) && !defined(CONFIG_64BIT) SYSCALL_DEFINE6(pselect6_time32, int, n, fd_set __user *, inp, fd_set __user *, outp, fd_set __user *, exp, struct old_timespec32 __user *, tsp, |
d4e82042c [CVE-2009-0029] S... |
760 |
void __user *, sig) |
9f72949f6 [PATCH] Add psele... |
761 |
{ |
7e71609f6 pselect6() and fr... |
762 763 764 765 |
struct sigset_argpack x = {NULL, 0}; if (get_sigset_argpack(&x, sig)) return -EFAULT; |
9f72949f6 [PATCH] Add psele... |
766 |
|
7e71609f6 pselect6() and fr... |
767 |
return do_pselect(n, inp, outp, exp, tsp, x.p, x.size, PT_OLD_TIMESPEC); |
9f72949f6 [PATCH] Add psele... |
768 |
} |
9f72949f6 [PATCH] Add psele... |
769 |
|
e024707bc pselect6: use __k... |
770 |
#endif |
5d0e52830 Add generic sys_o... |
771 772 773 774 |
#ifdef __ARCH_WANT_SYS_OLD_SELECT struct sel_arg_struct { unsigned long n; fd_set __user *inp, *outp, *exp; |
75d319c06 y2038: syscalls: ... |
775 |
struct __kernel_old_timeval __user *tvp; |
5d0e52830 Add generic sys_o... |
776 777 778 779 780 781 782 783 |
}; SYSCALL_DEFINE1(old_select, struct sel_arg_struct __user *, arg) { struct sel_arg_struct a; if (copy_from_user(&a, arg, sizeof(a))) return -EFAULT; |
4bdb9acab fs: add kern_sele... |
784 |
return kern_select(a.n, a.inp, a.outp, a.exp, a.tvp); |
5d0e52830 Add generic sys_o... |
785 786 |
} #endif |
1da177e4c Linux-2.6.12-rc2 |
787 788 789 790 791 792 793 |
struct poll_list { struct poll_list *next; int len; struct pollfd entries[0]; }; #define POLLFD_PER_PAGE ((PAGE_SIZE-sizeof(struct poll_list)) / sizeof(struct pollfd)) |
4a4b69f79 [PATCH] Poll clea... |
794 795 796 797 798 |
/* * Fish for pollable events on the pollfd->fd file descriptor. We're only * interested in events matching the pollfd->events mask, and the result * matching that mask is both recorded in pollfd->revents and returned. The * pwait poll_table will be used by the fd-provided poll handler for waiting, |
626cf2366 poll: add poll_re... |
799 |
* if pwait->_qproc is non-NULL. |
4a4b69f79 [PATCH] Poll clea... |
800 |
*/ |
fb3679372 annotate poll(2) ... |
801 |
static inline __poll_t do_pollfd(struct pollfd *pollfd, poll_table *pwait, |
cbf55001b net: rename low l... |
802 |
bool *can_busy_poll, |
fb3679372 annotate poll(2) ... |
803 |
__poll_t busy_flag) |
1da177e4c Linux-2.6.12-rc2 |
804 |
{ |
a0f8dcfc6 fs: cleanup do_po... |
805 806 807 808 809 810 811 812 813 814 815 816 817 |
int fd = pollfd->fd; __poll_t mask = 0, filter; struct fd f; if (fd < 0) goto out; mask = EPOLLNVAL; f = fdget(fd); if (!f.file) goto out; /* userland u16 ->events contains POLL... bitmap */ filter = demangle_poll(pollfd->events) | EPOLLERR | EPOLLHUP; |
9965ed174 fs: add new vfs_p... |
818 819 820 821 |
pwait->_key = filter | busy_flag; mask = vfs_poll(f.file, pwait); if (mask & busy_flag) *can_busy_poll = true; |
a0f8dcfc6 fs: cleanup do_po... |
822 823 824 825 |
mask &= filter; /* Mask out unneeded events. */ fdput(f); out: |
fb3679372 annotate poll(2) ... |
826 |
/* ... and so does ->revents */ |
c71d227fc make kernel-side ... |
827 |
pollfd->revents = mangle_poll(mask); |
4a4b69f79 [PATCH] Poll clea... |
828 |
return mask; |
1da177e4c Linux-2.6.12-rc2 |
829 |
} |
ccec5ee30 poll: plug an unu... |
830 |
static int do_poll(struct poll_list *list, struct poll_wqueues *wait, |
766b9f928 fs: poll/select/r... |
831 |
struct timespec64 *end_time) |
1da177e4c Linux-2.6.12-rc2 |
832 |
{ |
1da177e4c Linux-2.6.12-rc2 |
833 |
poll_table* pt = &wait->pt; |
8ff3e8e85 select: switch se... |
834 835 |
ktime_t expire, *to = NULL; int timed_out = 0, count = 0; |
da8b44d5a timer: convert ti... |
836 |
u64 slack = 0; |
fb3679372 annotate poll(2) ... |
837 |
__poll_t busy_flag = net_busy_loop_on() ? POLL_BUSY_LOOP : 0; |
37056719b net: Track start ... |
838 |
unsigned long busy_start = 0; |
1da177e4c Linux-2.6.12-rc2 |
839 |
|
9f72949f6 [PATCH] Add psele... |
840 |
/* Optimise the no-wait case */ |
8ff3e8e85 select: switch se... |
841 |
if (end_time && !end_time->tv_sec && !end_time->tv_nsec) { |
626cf2366 poll: add poll_re... |
842 |
pt->_qproc = NULL; |
8ff3e8e85 select: switch se... |
843 844 |
timed_out = 1; } |
9bf084f70 do_poll: return -... |
845 |
|
96d2ab484 hrtimer: fix sign... |
846 |
if (end_time && !timed_out) |
231f3d393 select: rename es... |
847 |
slack = select_estimate_accuracy(end_time); |
90d6e24a3 hrtimer: make sel... |
848 |
|
1da177e4c Linux-2.6.12-rc2 |
849 850 |
for (;;) { struct poll_list *walk; |
cbf55001b net: rename low l... |
851 |
bool can_busy_loop = false; |
9f72949f6 [PATCH] Add psele... |
852 |
|
4a4b69f79 [PATCH] Poll clea... |
853 854 855 856 857 858 859 860 |
for (walk = list; walk != NULL; walk = walk->next) { struct pollfd * pfd, * pfd_end; pfd = walk->entries; pfd_end = pfd + walk->len; for (; pfd != pfd_end; pfd++) { /* * Fish for events. If we found one, record it |
626cf2366 poll: add poll_re... |
861 |
* and kill poll_table->_qproc, so we don't |
4a4b69f79 [PATCH] Poll clea... |
862 863 864 865 |
* needlessly register any other waiters after * this. They'll get immediately deregistered * when we break out and return. */ |
cbf55001b net: rename low l... |
866 867 |
if (do_pollfd(pfd, pt, &can_busy_loop, busy_flag)) { |
4a4b69f79 [PATCH] Poll clea... |
868 |
count++; |
626cf2366 poll: add poll_re... |
869 |
pt->_qproc = NULL; |
cbf55001b net: rename low l... |
870 871 872 |
/* found something, stop busy polling */ busy_flag = 0; can_busy_loop = false; |
4a4b69f79 [PATCH] Poll clea... |
873 874 |
} } |
1da177e4c Linux-2.6.12-rc2 |
875 |
} |
4a4b69f79 [PATCH] Poll clea... |
876 877 |
/* * All waiters have already been registered, so don't provide |
626cf2366 poll: add poll_re... |
878 |
* a poll_table->_qproc to them on the next loop iteration. |
4a4b69f79 [PATCH] Poll clea... |
879 |
*/ |
626cf2366 poll: add poll_re... |
880 |
pt->_qproc = NULL; |
9bf084f70 do_poll: return -... |
881 882 883 |
if (!count) { count = wait->error; if (signal_pending(current)) |
8cf8b5539 select: change do... |
884 |
count = -ERESTARTNOHAND; |
9bf084f70 do_poll: return -... |
885 |
} |
8ff3e8e85 select: switch se... |
886 |
if (count || timed_out) |
1da177e4c Linux-2.6.12-rc2 |
887 |
break; |
9f72949f6 [PATCH] Add psele... |
888 |
|
cbf55001b net: rename low l... |
889 |
/* only if found POLL_BUSY_LOOP sockets && not out of time */ |
76b1e9b98 net/fs: change bu... |
890 |
if (can_busy_loop && !need_resched()) { |
37056719b net: Track start ... |
891 892 |
if (!busy_start) { busy_start = busy_loop_current_time(); |
76b1e9b98 net/fs: change bu... |
893 894 |
continue; } |
37056719b net: Track start ... |
895 |
if (!busy_loop_timeout(busy_start)) |
76b1e9b98 net/fs: change bu... |
896 897 898 |
continue; } busy_flag = 0; |
91e2fd337 net: avoid callin... |
899 |
|
8ff3e8e85 select: switch se... |
900 901 902 903 904 905 |
/* * If this is the first loop and we have a timeout * given, then we convert to ktime_t and set the to * pointer to the expiry value. */ if (end_time && !to) { |
766b9f928 fs: poll/select/r... |
906 |
expire = timespec64_to_ktime(*end_time); |
8ff3e8e85 select: switch se... |
907 |
to = &expire; |
9f72949f6 [PATCH] Add psele... |
908 |
} |
5f820f648 poll: allow f_op-... |
909 |
if (!poll_schedule_timeout(wait, TASK_INTERRUPTIBLE, to, slack)) |
8ff3e8e85 select: switch se... |
910 |
timed_out = 1; |
1da177e4c Linux-2.6.12-rc2 |
911 |
} |
1da177e4c Linux-2.6.12-rc2 |
912 913 |
return count; } |
70674f95c [PATCH] Optimize ... |
914 915 |
#define N_STACK_PPS ((sizeof(stack_pps) - sizeof(struct poll_list)) / \ sizeof(struct pollfd)) |
e99ca56ce move compat selec... |
916 |
static int do_sys_poll(struct pollfd __user *ufds, unsigned int nfds, |
766b9f928 fs: poll/select/r... |
917 |
struct timespec64 *end_time) |
1da177e4c Linux-2.6.12-rc2 |
918 919 |
{ struct poll_wqueues table; |
43e11fa2d fs/select.c: use ... |
920 |
int err = -EFAULT, fdcount, len; |
30c14e40e [PATCH] avoid una... |
921 922 923 924 |
/* Allocate small arguments on the stack to save memory and be faster - use long to make sure the buffer is aligned properly on 64 bit archs to avoid unaligned access */ long stack_pps[POLL_STACK_ALLOC/sizeof(long)]; |
252e5725c do_sys_poll: simp... |
925 926 927 |
struct poll_list *const head = (struct poll_list *)stack_pps; struct poll_list *walk = head; unsigned long todo = nfds; |
1da177e4c Linux-2.6.12-rc2 |
928 |
|
d554ed895 fs: use rlimit he... |
929 |
if (nfds > rlimit(RLIMIT_NOFILE)) |
1da177e4c Linux-2.6.12-rc2 |
930 |
return -EINVAL; |
252e5725c do_sys_poll: simp... |
931 932 933 934 935 936 |
len = min_t(unsigned int, nfds, N_STACK_PPS); for (;;) { walk->next = NULL; walk->len = len; if (!len) break; |
1da177e4c Linux-2.6.12-rc2 |
937 |
|
252e5725c do_sys_poll: simp... |
938 939 940 941 942 943 944 |
if (copy_from_user(walk->entries, ufds + nfds-todo, sizeof(struct pollfd) * walk->len)) goto out_fds; todo -= walk->len; if (!todo) break; |
1da177e4c Linux-2.6.12-rc2 |
945 |
|
252e5725c do_sys_poll: simp... |
946 |
len = min(todo, POLLFD_PER_PAGE); |
43e11fa2d fs/select.c: use ... |
947 948 |
walk = walk->next = kmalloc(struct_size(walk, entries, len), GFP_KERNEL); |
252e5725c do_sys_poll: simp... |
949 950 |
if (!walk) { err = -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
951 952 |
goto out_fds; } |
1da177e4c Linux-2.6.12-rc2 |
953 |
} |
9f72949f6 [PATCH] Add psele... |
954 |
|
252e5725c do_sys_poll: simp... |
955 |
poll_initwait(&table); |
ccec5ee30 poll: plug an unu... |
956 |
fdcount = do_poll(head, &table, end_time); |
252e5725c do_sys_poll: simp... |
957 |
poll_freewait(&table); |
1da177e4c Linux-2.6.12-rc2 |
958 |
|
252e5725c do_sys_poll: simp... |
959 |
for (walk = head; walk; walk = walk->next) { |
1da177e4c Linux-2.6.12-rc2 |
960 961 |
struct pollfd *fds = walk->entries; int j; |
252e5725c do_sys_poll: simp... |
962 963 |
for (j = 0; j < walk->len; j++, ufds++) if (__put_user(fds[j].revents, &ufds->revents)) |
1da177e4c Linux-2.6.12-rc2 |
964 |
goto out_fds; |
1da177e4c Linux-2.6.12-rc2 |
965 |
} |
252e5725c do_sys_poll: simp... |
966 |
|
1da177e4c Linux-2.6.12-rc2 |
967 |
err = fdcount; |
1da177e4c Linux-2.6.12-rc2 |
968 |
out_fds: |
252e5725c do_sys_poll: simp... |
969 970 971 972 973 |
walk = head->next; while (walk) { struct poll_list *pos = walk; walk = walk->next; kfree(pos); |
1da177e4c Linux-2.6.12-rc2 |
974 |
} |
252e5725c do_sys_poll: simp... |
975 |
|
1da177e4c Linux-2.6.12-rc2 |
976 977 |
return err; } |
9f72949f6 [PATCH] Add psele... |
978 |
|
3075d9da0 Use ERESTART_REST... |
979 980 |
static long do_restart_poll(struct restart_block *restart_block) { |
8ff3e8e85 select: switch se... |
981 982 |
struct pollfd __user *ufds = restart_block->poll.ufds; int nfds = restart_block->poll.nfds; |
766b9f928 fs: poll/select/r... |
983 |
struct timespec64 *to = NULL, end_time; |
3075d9da0 Use ERESTART_REST... |
984 |
int ret; |
8ff3e8e85 select: switch se... |
985 986 987 988 989 990 991 |
if (restart_block->poll.has_timeout) { end_time.tv_sec = restart_block->poll.tv_sec; end_time.tv_nsec = restart_block->poll.tv_nsec; to = &end_time; } ret = do_sys_poll(ufds, nfds, to); |
8cf8b5539 select: change do... |
992 |
if (ret == -ERESTARTNOHAND) { |
3075d9da0 Use ERESTART_REST... |
993 |
restart_block->fn = do_restart_poll; |
3075d9da0 Use ERESTART_REST... |
994 995 996 997 |
ret = -ERESTART_RESTARTBLOCK; } return ret; } |
5a8a82b1d [CVE-2009-0029] S... |
998 |
SYSCALL_DEFINE3(poll, struct pollfd __user *, ufds, unsigned int, nfds, |
faf309009 sys_poll: fix inc... |
999 |
int, timeout_msecs) |
9f72949f6 [PATCH] Add psele... |
1000 |
{ |
766b9f928 fs: poll/select/r... |
1001 |
struct timespec64 end_time, *to = NULL; |
3075d9da0 Use ERESTART_REST... |
1002 |
int ret; |
9f72949f6 [PATCH] Add psele... |
1003 |
|
8ff3e8e85 select: switch se... |
1004 1005 1006 1007 |
if (timeout_msecs >= 0) { to = &end_time; poll_select_set_timeout(to, timeout_msecs / MSEC_PER_SEC, NSEC_PER_MSEC * (timeout_msecs % MSEC_PER_SEC)); |
9f72949f6 [PATCH] Add psele... |
1008 |
} |
8ff3e8e85 select: switch se... |
1009 |
ret = do_sys_poll(ufds, nfds, to); |
8cf8b5539 select: change do... |
1010 |
if (ret == -ERESTARTNOHAND) { |
3075d9da0 Use ERESTART_REST... |
1011 |
struct restart_block *restart_block; |
8ff3e8e85 select: switch se... |
1012 |
|
f56141e3e all arches, signa... |
1013 |
restart_block = ¤t->restart_block; |
3075d9da0 Use ERESTART_REST... |
1014 |
restart_block->fn = do_restart_poll; |
8ff3e8e85 select: switch se... |
1015 1016 1017 1018 1019 1020 1021 1022 1023 |
restart_block->poll.ufds = ufds; restart_block->poll.nfds = nfds; if (timeout_msecs >= 0) { restart_block->poll.tv_sec = end_time.tv_sec; restart_block->poll.tv_nsec = end_time.tv_nsec; restart_block->poll.has_timeout = 1; } else restart_block->poll.has_timeout = 0; |
3075d9da0 Use ERESTART_REST... |
1024 1025 1026 |
ret = -ERESTART_RESTARTBLOCK; } return ret; |
9f72949f6 [PATCH] Add psele... |
1027 |
} |
d4e82042c [CVE-2009-0029] S... |
1028 |
SYSCALL_DEFINE5(ppoll, struct pollfd __user *, ufds, unsigned int, nfds, |
8bd27a300 ppoll: use __kern... |
1029 |
struct __kernel_timespec __user *, tsp, const sigset_t __user *, sigmask, |
d4e82042c [CVE-2009-0029] S... |
1030 |
size_t, sigsetsize) |
9f72949f6 [PATCH] Add psele... |
1031 |
{ |
36819ad09 select: Use get/p... |
1032 |
struct timespec64 ts, end_time, *to = NULL; |
9f72949f6 [PATCH] Add psele... |
1033 1034 1035 |
int ret; if (tsp) { |
36819ad09 select: Use get/p... |
1036 |
if (get_timespec64(&ts, tsp)) |
9f72949f6 [PATCH] Add psele... |
1037 |
return -EFAULT; |
8ff3e8e85 select: switch se... |
1038 1039 1040 |
to = &end_time; if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec)) return -EINVAL; |
9f72949f6 [PATCH] Add psele... |
1041 |
} |
b772434be signal: simplify ... |
1042 |
ret = set_user_sigmask(sigmask, sigsetsize); |
ded653ccb signal: Add set_u... |
1043 1044 |
if (ret) return ret; |
9f72949f6 [PATCH] Add psele... |
1045 |
|
8ff3e8e85 select: switch se... |
1046 |
ret = do_sys_poll(ufds, nfds, to); |
ac3010206 select: shift res... |
1047 |
return poll_select_finish(&end_time, tsp, PT_TIMESPEC, ret); |
9f72949f6 [PATCH] Add psele... |
1048 |
} |
e99ca56ce move compat selec... |
1049 |
|
8bd27a300 ppoll: use __kern... |
1050 |
#if defined(CONFIG_COMPAT_32BIT_TIME) && !defined(CONFIG_64BIT) |
e99ca56ce move compat selec... |
1051 |
|
8bd27a300 ppoll: use __kern... |
1052 1053 1054 |
SYSCALL_DEFINE5(ppoll_time32, struct pollfd __user *, ufds, unsigned int, nfds, struct old_timespec32 __user *, tsp, const sigset_t __user *, sigmask, size_t, sigsetsize) |
e99ca56ce move compat selec... |
1055 |
{ |
8bd27a300 ppoll: use __kern... |
1056 1057 |
struct timespec64 ts, end_time, *to = NULL; int ret; |
e99ca56ce move compat selec... |
1058 |
|
8bd27a300 ppoll: use __kern... |
1059 1060 1061 |
if (tsp) { if (get_old_timespec32(&ts, tsp)) return -EFAULT; |
e99ca56ce move compat selec... |
1062 |
|
8bd27a300 ppoll: use __kern... |
1063 1064 1065 1066 |
to = &end_time; if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec)) return -EINVAL; } |
e99ca56ce move compat selec... |
1067 |
|
b772434be signal: simplify ... |
1068 |
ret = set_user_sigmask(sigmask, sigsetsize); |
8bd27a300 ppoll: use __kern... |
1069 |
if (ret) |
e99ca56ce move compat selec... |
1070 |
return ret; |
8bd27a300 ppoll: use __kern... |
1071 |
ret = do_sys_poll(ufds, nfds, to); |
ac3010206 select: shift res... |
1072 |
return poll_select_finish(&end_time, tsp, PT_OLD_TIMESPEC, ret); |
e99ca56ce move compat selec... |
1073 |
} |
8bd27a300 ppoll: use __kern... |
1074 1075 1076 1077 |
#endif #ifdef CONFIG_COMPAT #define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t)) |
e99ca56ce move compat selec... |
1078 1079 1080 1081 1082 1083 1084 1085 1086 |
/* * Ooo, nasty. We need here to frob 32-bit unsigned longs to * 64-bit unsigned longs. */ static int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset, unsigned long *fdset) { |
e99ca56ce move compat selec... |
1087 |
if (ufdset) { |
464d62421 select: switch co... |
1088 |
return compat_get_bitmap(fdset, ufdset, nr); |
e99ca56ce move compat selec... |
1089 |
} else { |
79de3cbe9 fs/select: Fix me... |
1090 |
zero_fd_set(nr, fdset); |
464d62421 select: switch co... |
1091 |
return 0; |
e99ca56ce move compat selec... |
1092 |
} |
e99ca56ce move compat selec... |
1093 1094 1095 1096 1097 1098 |
} static int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset, unsigned long *fdset) { |
e99ca56ce move compat selec... |
1099 1100 |
if (!ufdset) return 0; |
464d62421 select: switch co... |
1101 |
return compat_put_bitmap(ufdset, fdset, nr); |
e99ca56ce move compat selec... |
1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 |
} /* * This is a virtual copy of sys_select from fs/select.c and probably * should be compared to it from time to time */ /* * We can actually return ERESTARTSYS instead of EINTR, but I'd * like to be certain this leads to no problems. So I return * EINTR just for safety. * * Update: ERESTARTSYS breaks at least the xview clock binary, so * I'm trying ERESTARTNOHAND which restart only when you want to. */ static int compat_core_sys_select(int n, compat_ulong_t __user *inp, compat_ulong_t __user *outp, compat_ulong_t __user *exp, |
36819ad09 select: Use get/p... |
1120 |
struct timespec64 *end_time) |
e99ca56ce move compat selec... |
1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 |
{ fd_set_bits fds; void *bits; int size, max_fds, ret = -EINVAL; struct fdtable *fdt; long stack_fds[SELECT_STACK_ALLOC/sizeof(long)]; if (n < 0) goto out_nofds; /* max_fds can increase, so grab it once to avoid race */ rcu_read_lock(); fdt = files_fdtable(current->files); max_fds = fdt->max_fds; rcu_read_unlock(); if (n > max_fds) n = max_fds; /* * We need 6 bitmaps (in/out/ex for both incoming and outgoing), * since we used fdset we need to allocate memory in units of * long-words. */ size = FDS_BYTES(n); bits = stack_fds; if (size > sizeof(stack_fds) / 6) { |
6da2ec560 treewide: kmalloc... |
1147 |
bits = kmalloc_array(6, size, GFP_KERNEL); |
e99ca56ce move compat selec... |
1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 |
ret = -ENOMEM; if (!bits) goto out_nofds; } fds.in = (unsigned long *) bits; fds.out = (unsigned long *) (bits + size); fds.ex = (unsigned long *) (bits + 2*size); fds.res_in = (unsigned long *) (bits + 3*size); fds.res_out = (unsigned long *) (bits + 4*size); fds.res_ex = (unsigned long *) (bits + 5*size); if ((ret = compat_get_fd_set(n, inp, fds.in)) || (ret = compat_get_fd_set(n, outp, fds.out)) || (ret = compat_get_fd_set(n, exp, fds.ex))) goto out; zero_fd_set(n, fds.res_in); zero_fd_set(n, fds.res_out); zero_fd_set(n, fds.res_ex); ret = do_select(n, &fds, end_time); if (ret < 0) goto out; if (!ret) { ret = -ERESTARTNOHAND; if (signal_pending(current)) goto out; ret = 0; } if (compat_set_fd_set(n, inp, fds.res_in) || compat_set_fd_set(n, outp, fds.res_out) || compat_set_fd_set(n, exp, fds.res_ex)) ret = -EFAULT; out: if (bits != stack_fds) kfree(bits); out_nofds: return ret; } |
05585e449 fs: add do_compat... |
1188 1189 |
static int do_compat_select(int n, compat_ulong_t __user *inp, compat_ulong_t __user *outp, compat_ulong_t __user *exp, |
9afc5eee6 y2038: globally r... |
1190 |
struct old_timeval32 __user *tvp) |
e99ca56ce move compat selec... |
1191 |
{ |
36819ad09 select: Use get/p... |
1192 |
struct timespec64 end_time, *to = NULL; |
9afc5eee6 y2038: globally r... |
1193 |
struct old_timeval32 tv; |
e99ca56ce move compat selec... |
1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 |
int ret; if (tvp) { if (copy_from_user(&tv, tvp, sizeof(tv))) return -EFAULT; to = &end_time; if (poll_select_set_timeout(to, tv.tv_sec + (tv.tv_usec / USEC_PER_SEC), (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC)) return -EINVAL; } ret = compat_core_sys_select(n, inp, outp, exp, to); |
ac3010206 select: shift res... |
1208 |
return poll_select_finish(&end_time, tvp, PT_OLD_TIMEVAL, ret); |
e99ca56ce move compat selec... |
1209 |
} |
05585e449 fs: add do_compat... |
1210 1211 |
COMPAT_SYSCALL_DEFINE5(select, int, n, compat_ulong_t __user *, inp, compat_ulong_t __user *, outp, compat_ulong_t __user *, exp, |
9afc5eee6 y2038: globally r... |
1212 |
struct old_timeval32 __user *, tvp) |
05585e449 fs: add do_compat... |
1213 1214 1215 |
{ return do_compat_select(n, inp, outp, exp, tvp); } |
e99ca56ce move compat selec... |
1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 |
struct compat_sel_arg_struct { compat_ulong_t n; compat_uptr_t inp; compat_uptr_t outp; compat_uptr_t exp; compat_uptr_t tvp; }; COMPAT_SYSCALL_DEFINE1(old_select, struct compat_sel_arg_struct __user *, arg) { struct compat_sel_arg_struct a; if (copy_from_user(&a, arg, sizeof(a))) return -EFAULT; |
05585e449 fs: add do_compat... |
1230 1231 |
return do_compat_select(a.n, compat_ptr(a.inp), compat_ptr(a.outp), compat_ptr(a.exp), compat_ptr(a.tvp)); |
e99ca56ce move compat selec... |
1232 1233 1234 1235 |
} static long do_compat_pselect(int n, compat_ulong_t __user *inp, compat_ulong_t __user *outp, compat_ulong_t __user *exp, |
e024707bc pselect6: use __k... |
1236 1237 |
void __user *tsp, compat_sigset_t __user *sigmask, compat_size_t sigsetsize, enum poll_time_type type) |
e99ca56ce move compat selec... |
1238 |
{ |
36819ad09 select: Use get/p... |
1239 |
struct timespec64 ts, end_time, *to = NULL; |
e99ca56ce move compat selec... |
1240 1241 1242 |
int ret; if (tsp) { |
e024707bc pselect6: use __k... |
1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 |
switch (type) { case PT_OLD_TIMESPEC: if (get_old_timespec32(&ts, tsp)) return -EFAULT; break; case PT_TIMESPEC: if (get_timespec64(&ts, tsp)) return -EFAULT; break; default: BUG(); } |
e99ca56ce move compat selec... |
1255 1256 1257 1258 1259 |
to = &end_time; if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec)) return -EINVAL; } |
b772434be signal: simplify ... |
1260 |
ret = set_compat_user_sigmask(sigmask, sigsetsize); |
ded653ccb signal: Add set_u... |
1261 1262 |
if (ret) return ret; |
e99ca56ce move compat selec... |
1263 1264 |
ret = compat_core_sys_select(n, inp, outp, exp, to); |
ac3010206 select: shift res... |
1265 |
return poll_select_finish(&end_time, tsp, type, ret); |
e99ca56ce move compat selec... |
1266 |
} |
7e71609f6 pselect6() and fr... |
1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 |
struct compat_sigset_argpack { compat_uptr_t p; compat_size_t size; }; static inline int get_compat_sigset_argpack(struct compat_sigset_argpack *to, struct compat_sigset_argpack __user *from) { if (from) { if (!user_read_access_begin(from, sizeof(*from))) return -EFAULT; unsafe_get_user(to->p, &from->p, Efault); unsafe_get_user(to->size, &from->size, Efault); user_read_access_end(); } return 0; Efault: user_access_end(); return -EFAULT; } |
e024707bc pselect6: use __k... |
1286 1287 1288 1289 |
COMPAT_SYSCALL_DEFINE6(pselect6_time64, int, n, compat_ulong_t __user *, inp, compat_ulong_t __user *, outp, compat_ulong_t __user *, exp, struct __kernel_timespec __user *, tsp, void __user *, sig) { |
7e71609f6 pselect6() and fr... |
1290 1291 1292 1293 |
struct compat_sigset_argpack x = {0, 0}; if (get_compat_sigset_argpack(&x, sig)) return -EFAULT; |
e024707bc pselect6: use __k... |
1294 |
|
7e71609f6 pselect6() and fr... |
1295 1296 |
return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(x.p), x.size, PT_TIMESPEC); |
e024707bc pselect6: use __k... |
1297 1298 1299 |
} #if defined(CONFIG_COMPAT_32BIT_TIME) |
8dabe7245 y2038: syscalls: ... |
1300 |
COMPAT_SYSCALL_DEFINE6(pselect6_time32, int, n, compat_ulong_t __user *, inp, |
e99ca56ce move compat selec... |
1301 |
compat_ulong_t __user *, outp, compat_ulong_t __user *, exp, |
9afc5eee6 y2038: globally r... |
1302 |
struct old_timespec32 __user *, tsp, void __user *, sig) |
e99ca56ce move compat selec... |
1303 |
{ |
7e71609f6 pselect6() and fr... |
1304 1305 1306 1307 |
struct compat_sigset_argpack x = {0, 0}; if (get_compat_sigset_argpack(&x, sig)) return -EFAULT; |
e024707bc pselect6: use __k... |
1308 |
|
7e71609f6 pselect6() and fr... |
1309 1310 |
return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(x.p), x.size, PT_OLD_TIMESPEC); |
e99ca56ce move compat selec... |
1311 |
} |
e024707bc pselect6: use __k... |
1312 |
#endif |
8bd27a300 ppoll: use __kern... |
1313 |
#if defined(CONFIG_COMPAT_32BIT_TIME) |
8dabe7245 y2038: syscalls: ... |
1314 |
COMPAT_SYSCALL_DEFINE5(ppoll_time32, struct pollfd __user *, ufds, |
9afc5eee6 y2038: globally r... |
1315 |
unsigned int, nfds, struct old_timespec32 __user *, tsp, |
e99ca56ce move compat selec... |
1316 1317 |
const compat_sigset_t __user *, sigmask, compat_size_t, sigsetsize) { |
36819ad09 select: Use get/p... |
1318 |
struct timespec64 ts, end_time, *to = NULL; |
e99ca56ce move compat selec... |
1319 1320 1321 |
int ret; if (tsp) { |
9afc5eee6 y2038: globally r... |
1322 |
if (get_old_timespec32(&ts, tsp)) |
e99ca56ce move compat selec... |
1323 1324 1325 1326 1327 1328 |
return -EFAULT; to = &end_time; if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec)) return -EINVAL; } |
b772434be signal: simplify ... |
1329 |
ret = set_compat_user_sigmask(sigmask, sigsetsize); |
ded653ccb signal: Add set_u... |
1330 1331 |
if (ret) return ret; |
e99ca56ce move compat selec... |
1332 1333 |
ret = do_sys_poll(ufds, nfds, to); |
ac3010206 select: shift res... |
1334 |
return poll_select_finish(&end_time, tsp, PT_OLD_TIMESPEC, ret); |
e99ca56ce move compat selec... |
1335 1336 |
} #endif |
8bd27a300 ppoll: use __kern... |
1337 1338 1339 1340 1341 1342 |
/* New compat syscall for 64 bit time_t*/ COMPAT_SYSCALL_DEFINE5(ppoll_time64, struct pollfd __user *, ufds, unsigned int, nfds, struct __kernel_timespec __user *, tsp, const compat_sigset_t __user *, sigmask, compat_size_t, sigsetsize) { |
8bd27a300 ppoll: use __kern... |
1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 |
struct timespec64 ts, end_time, *to = NULL; int ret; if (tsp) { if (get_timespec64(&ts, tsp)) return -EFAULT; to = &end_time; if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec)) return -EINVAL; } |
b772434be signal: simplify ... |
1354 |
ret = set_compat_user_sigmask(sigmask, sigsetsize); |
8bd27a300 ppoll: use __kern... |
1355 1356 1357 1358 |
if (ret) return ret; ret = do_sys_poll(ufds, nfds, to); |
ac3010206 select: shift res... |
1359 |
return poll_select_finish(&end_time, tsp, PT_TIMESPEC, ret); |
8bd27a300 ppoll: use __kern... |
1360 1361 1362 |
} #endif |