/* * X.25 Packet Layer release 002 * * This is ALPHA test software. This code may break your machine, * randomly fail to work with new releases, misbehave and/or generally * screw up. It might even work. * * This code REQUIRES 2.1.15 or higher * * This module: * This module 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. * * History * X.25 001 Jonathan Naylor Started coding. */ #include #include #include #include LIST_HEAD(x25_route_list); DEFINE_RWLOCK(x25_route_list_lock); /* * Add a new route. */ static int x25_add_route(struct x25_address *address, unsigned int sigdigits, struct net_device *dev) { struct x25_route *rt; struct list_head *entry; int rc = -EINVAL; write_lock_bh(&x25_route_list_lock); list_for_each(entry, &x25_route_list) { rt = list_entry(entry, struct x25_route, node); if (!memcmp(&rt->address, address, sigdigits) && rt->sigdigits == sigdigits) goto out; } rt = kmalloc(sizeof(*rt), GFP_ATOMIC); rc = -ENOMEM; if (!rt) goto out; strcpy(rt->address.x25_addr, "000000000000000"); memcpy(rt->address.x25_addr, address->x25_addr, sigdigits); rt->sigdigits = sigdigits; rt->dev = dev; atomic_set(&rt->refcnt, 1); list_add(&rt->node, &x25_route_list); rc = 0; out: write_unlock_bh(&x25_route_list_lock); return rc; } /** * __x25_remove_route - remove route from x25_route_list * @rt: route to remove * * Remove route from x25_route_list. If it was there. * Caller must hold x25_route_list_lock. */ static void __x25_remove_route(struct x25_route *rt) { if (rt->node.next) { list_del(&rt->node); x25_route_put(rt); } } static int x25_del_route(struct x25_address *address, unsigned int sigdigits, struct net_device *dev) { struct x25_route *rt; struct list_head *entry; int rc = -EINVAL; write_lock_bh(&x25_route_list_lock); list_for_each(entry, &x25_route_list) { rt = list_entry(entry, struct x25_route, node); if (!memcmp(&rt->address, address, sigdigits) && rt->sigdigits == sigdigits && rt->dev == dev) { __x25_remove_route(rt); rc = 0; break; } } write_unlock_bh(&x25_route_list_lock); return rc; } /* * A device has been removed, remove its routes. */ void x25_route_device_down(struct net_device *dev) { struct x25_route *rt; struct list_head *entry, *tmp; write_lock_bh(&x25_route_list_lock); list_for_each_safe(entry, tmp, &x25_route_list) { rt = list_entry(entry, struct x25_route, node); if (rt->dev == dev) __x25_remove_route(rt); } write_unlock_bh(&x25_route_list_lock); /* Remove any related forwarding */ x25_clear_forward_by_dev(dev); } /* * Check that the device given is a valid X.25 interface that is "up". */ struct net_device *x25_dev_get(char *devname) { struct net_device *dev = dev_get_by_name(&init_net, devname); if (dev && (!(dev->flags & IFF_UP) || (dev->type != ARPHRD_X25 #if IS_ENABLED(CONFIG_LLC) && dev->type != ARPHRD_ETHER #endif ))){ dev_put(dev); dev = NULL; } return dev; } /** * x25_get_route - Find a route given an X.25 address. * @addr - address to find a route for * * Find a route given an X.25 address. */ struct x25_route *x25_get_route(struct x25_address *addr) { struct x25_route *rt, *use = NULL; struct list_head *entry; read_lock_bh(&x25_route_list_lock); list_for_each(entry, &x25_route_list) { rt = list_entry(entry, struct x25_route, node); if (!memcmp(&rt->address, addr, rt->sigdigits)) { if (!use) use = rt; else if (rt->sigdigits > use->sigdigits) use = rt; } } if (use) x25_route_hold(use); read_unlock_bh(&x25_route_list_lock); return use; } /* * Handle the ioctls that control the routing functions. */ int x25_route_ioctl(unsigned int cmd, void __user *arg) { struct x25_route_struct rt; struct net_device *dev; int rc = -EINVAL; if (cmd != SIOCADDRT && cmd != SIOCDELRT) goto out; rc = -EFAULT; if (copy_from_user(&rt, arg, sizeof(rt))) goto out; rc = -EINVAL; if (rt.sigdigits > 15) goto out; dev = x25_dev_get(rt.device); if (!dev) goto out; if (cmd == SIOCADDRT) rc = x25_add_route(&rt.address, rt.sigdigits, dev); else rc = x25_del_route(&rt.address, rt.sigdigits, dev); dev_put(dev); out: return rc; } /* * Release all memory associated with X.25 routing structures. */ void __exit x25_route_free(void) { struct x25_route *rt; struct list_head *entry, *tmp; write_lock_bh(&x25_route_list_lock); list_for_each_safe(entry, tmp, &x25_route_list) { rt = list_entry(entry, struct x25_route, node); __x25_remove_route(rt); } write_unlock_bh(&x25_route_list_lock); } label'>mode:
authorArd Biesheuvel <ard.biesheuvel@linaro.org>2017-02-01 17:45:02 +0000
committerIngo Molnar <mingo@kernel.org>2017-02-01 21:17:49 +0100
commitc8f325a59cfc718d13a50fbc746ed9b415c25e92 (patch)
treed53fbdac9d0781e39a13b2ac6b2bd258cf3b4140 /tools/arch/s390/include/uapi/asm/bitsperlong.h
parentbf29bddf0417a4783da3b24e8c9e017ac649326f (diff)
efi/fdt: Avoid FDT manipulation after ExitBootServices()
Some AArch64 UEFI implementations disable the MMU in ExitBootServices(), after which unaligned accesses to RAM are no longer supported. Commit: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel") fixed an issue in the memory map handling of the stub FDT code, but inadvertently created an issue with such firmware, by moving some of the FDT manipulation to after the invocation of ExitBootServices(). Given that the stub's libfdt implementation uses the ordinary, accelerated string functions, which rely on hardware handling of unaligned accesses, manipulating the FDT with the MMU off may result in alignment faults. So fix the situation by moving the update_fdt_memmap() call into the callback function invoked by efi_exit_boot_services() right before it calls the ExitBootServices() UEFI service (which is arguably a better place for it anyway) Note that disabling the MMU in ExitBootServices() is not compliant with the UEFI spec, and carries great risk due to the fact that switching from cached to uncached memory accesses halfway through compiler generated code (i.e., involving a stack) can never be done in a way that is architecturally safe. Fixes: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel") Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Tested-by: Riku Voipio <riku.voipio@linaro.org> Cc: <stable@vger.kernel.org> Cc: mark.rutland@arm.com Cc: linux-efi@vger.kernel.org Cc: matt@codeblueprint.co.uk Cc: leif.lindholm@linaro.org Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/1485971102-23330-2-git-send-email-ard.biesheuvel@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'tools/arch/s390/include/uapi/asm/bitsperlong.h')