/* * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* * Callsign/UID mapper. This is in kernel space for security on multi-amateur machines. */ static HLIST_HEAD(ax25_uid_list); static DEFINE_RWLOCK(ax25_uid_lock); int ax25_uid_policy; EXPORT_SYMBOL(ax25_uid_policy); ax25_uid_assoc *ax25_findbyuid(kuid_t uid) { ax25_uid_assoc *ax25_uid, *res = NULL; read_lock(&ax25_uid_lock); ax25_uid_for_each(ax25_uid, &ax25_uid_list) { if (uid_eq(ax25_uid->uid, uid)) { ax25_uid_hold(ax25_uid); res = ax25_uid; break; } } read_unlock(&ax25_uid_lock); return res; } EXPORT_SYMBOL(ax25_findbyuid); int ax25_uid_ioctl(int cmd, struct sockaddr_ax25 *sax) { ax25_uid_assoc *ax25_uid; ax25_uid_assoc *user; unsigned long res; switch (cmd) { case SIOCAX25GETUID: res = -ENOENT; read_lock(&ax25_uid_lock); ax25_uid_for_each(ax25_uid, &ax25_uid_list) { if (ax25cmp(&sax->sax25_call, &ax25_uid->call) == 0) { res = from_kuid_munged(current_user_ns(), ax25_uid->uid); break; } } read_unlock(&ax25_uid_lock); return res; case SIOCAX25ADDUID: { kuid_t sax25_kuid; if (!capable(CAP_NET_ADMIN)) return -EPERM; sax25_kuid = make_kuid(current_user_ns(), sax->sax25_uid); if (!uid_valid(sax25_kuid)) return -EINVAL; user = ax25_findbyuid(sax25_kuid); if (user) { ax25_uid_put(user); return -EEXIST; } if (sax->sax25_uid == 0) return -EINVAL; if ((ax25_uid = kmalloc(sizeof(*ax25_uid), GFP_KERNEL)) == NULL) return -ENOMEM; atomic_set(&ax25_uid->refcount, 1); ax25_uid->uid = sax25_kuid; ax25_uid->call = sax->sax25_call; write_lock(&ax25_uid_lock); hlist_add_head(&ax25_uid->uid_node, &ax25_uid_list); write_unlock(&ax25_uid_lock); return 0; } case SIOCAX25DELUID: if (!capable(CAP_NET_ADMIN)) return -EPERM; ax25_uid = NULL; write_lock(&ax25_uid_lock); ax25_uid_for_each(ax25_uid, &ax25_uid_list) { if (ax25cmp(&sax->sax25_call, &ax25_uid->call) == 0) break; } if (ax25_uid == NULL) { write_unlock(&ax25_uid_lock); return -ENOENT; } hlist_del_init(&ax25_uid->uid_node); ax25_uid_put(ax25_uid); write_unlock(&ax25_uid_lock); return 0; default: return -EINVAL; } return -EINVAL; /*NOTREACHED */ } #ifdef CONFIG_PROC_FS static void *ax25_uid_seq_start(struct seq_file *seq, loff_t *pos) __acquires(ax25_uid_lock) { read_lock(&ax25_uid_lock); return seq_hlist_start_head(&ax25_uid_list, *pos); } static void *ax25_uid_seq_next(struct seq_file *seq, void *v, loff_t *pos) { return seq_hlist_next(v, &ax25_uid_list, pos); } static void ax25_uid_seq_stop(struct seq_file *seq, void *v) __releases(ax25_uid_lock) { read_unlock(&ax25_uid_lock); } static int ax25_uid_seq_show(struct seq_file *seq, void *v) { char buf[11]; if (v == SEQ_START_TOKEN) seq_printf(seq, "Policy: %d\n", ax25_uid_policy); else { struct ax25_uid_assoc *pt; pt = hlist_entry(v, struct ax25_uid_assoc, uid_node); seq_printf(seq, "%6d %s\n", from_kuid_munged(seq_user_ns(seq), pt->uid), ax2asc(buf, &pt->call)); } return 0; } static const struct seq_operations ax25_uid_seqops = { .start = ax25_uid_seq_start, .next = ax25_uid_seq_next, .stop = ax25_uid_seq_stop, .show = ax25_uid_seq_show, }; static int ax25_uid_info_open(struct inode *inode, struct file *file) { return seq_open(file, &ax25_uid_seqops); } const struct file_operations ax25_uid_fops = { .owner = THIS_MODULE, .open = ax25_uid_info_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release, }; #endif /* * Free all memory associated with UID/Callsign structures. */ void __exit ax25_uid_free(void) { ax25_uid_assoc *ax25_uid; write_lock(&ax25_uid_lock); again: ax25_uid_for_each(ax25_uid, &ax25_uid_list) { hlist_del_init(&ax25_uid->uid_node); ax25_uid_put(ax25_uid); goto again; } write_unlock(&ax25_uid_lock); } d>Marc Zyngier <marc.zyngier@arm.com>2017-01-17 16:00:48 +0000 committerThomas Gleixner <tglx@linutronix.de>2017-01-30 15:18:56 +0100 commit08d85f3ea99f1eeafc4e8507936190e86a16ee8c (patch) tree410bb1acd0cd7dcfaad37ae7b63ff243b7fa4bee /include/net/mpls.h parent566cf877a1fcb6d6dc0126b076aad062054c2637 (diff)
irqdomain: Avoid activating interrupts more than once
Since commit f3b0946d629c ("genirq/msi: Make sure PCI MSIs are activated early"), we can end-up activating a PCI/MSI twice (once at allocation time, and once at startup time). This is normally of no consequences, except that there is some HW out there that may misbehave if activate is used more than once (the GICv3 ITS, for example, uses the activate callback to issue the MAPVI command, and the architecture spec says that "If there is an existing mapping for the EventID-DeviceID combination, behavior is UNPREDICTABLE"). While this could be worked around in each individual driver, it may make more sense to tackle the issue at the core level. In order to avoid getting in that situation, let's have a per-interrupt flag to remember if we have already activated that interrupt or not. Fixes: f3b0946d629c ("genirq/msi: Make sure PCI MSIs are activated early") Reported-and-tested-by: Andre Przywara <andre.przywara@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Cc: stable@vger.kernel.org Link: http://lkml.kernel.org/r/1484668848-24361-1-git-send-email-marc.zyngier@arm.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include/net/mpls.h')