Revision 918fe1b3157978ada4267468008c5f89ef101e7d authored by Linus Torvalds on 03 June 2018, 00:35:53 UTC, committed by Linus Torvalds on 03 June 2018, 00:35:53 UTC
Pull networking fixes from David Miller: 1) Infinite loop in _decode_session6(), from Eric Dumazet. 2) Pass correct argument to nla_strlcpy() in netfilter, also from Eric Dumazet. 3) Out of bounds memory access in ipv6 srh code, from Mathieu Xhonneux. 4) NULL deref in XDP_REDIRECT handling of tun driver, from Toshiaki Makita. 5) Incorrect idr release in cls_flower, from Paul Blakey. 6) Probe error handling fix in davinci_emac, from Dan Carpenter. 7) Memory leak in XPS configuration, from Alexander Duyck. 8) Use after free with cloned sockets in kcm, from Kirill Tkhai. 9) MTU handling fixes fo ip_tunnel and ip6_tunnel, from Nicolas Dichtel. 10) Fix UAPI hole in bpf data structure for 32-bit compat applications, from Daniel Borkmann. * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (33 commits) bpf: fix uapi hole for 32 bit compat applications net: usb: cdc_mbim: add flag FLAG_SEND_ZLP ip6_tunnel: remove magic mtu value 0xFFF8 ip_tunnel: restore binding to ifaces with a large mtu net: dsa: b53: Add BCM5389 support kcm: Fix use-after-free caused by clonned sockets net-sysfs: Fix memory leak in XPS configuration ixgbe: fix parsing of TC actions for HW offload net: ethernet: davinci_emac: fix error handling in probe() net/ncsi: Fix array size in dumpit handler cls_flower: Fix incorrect idr release when failing to modify rule net/sonic: Use dma_mapping_error() xfrm Fix potential error pointer dereference in xfrm_bundle_create. vhost_net: flush batched heads before trying to busy polling tun: Fix NULL pointer dereference in XDP redirect be2net: Fix error detection logic for BE3 net: qmi_wwan: Add Netgear Aircard 779S mlxsw: spectrum: Forbid creation of VLAN 1 over port/LAG atm: zatm: fix memcmp casting iwlwifi: pcie: compare with number of IRQs requested for, not number of CPUs ...
percpu-km.c
/*
* mm/percpu-km.c - kernel memory based chunk allocation
*
* Copyright (C) 2010 SUSE Linux Products GmbH
* Copyright (C) 2010 Tejun Heo <tj@kernel.org>
*
* This file is released under the GPLv2.
*
* Chunks are allocated as a contiguous kernel memory using gfp
* allocation. This is to be used on nommu architectures.
*
* To use percpu-km,
*
* - define CONFIG_NEED_PER_CPU_KM from the arch Kconfig.
*
* - CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK must not be defined. It's
* not compatible with PER_CPU_KM. EMBED_FIRST_CHUNK should work
* fine.
*
* - NUMA is not supported. When setting up the first chunk,
* @cpu_distance_fn should be NULL or report all CPUs to be nearer
* than or at LOCAL_DISTANCE.
*
* - It's best if the chunk size is power of two multiple of
* PAGE_SIZE. Because each chunk is allocated as a contiguous
* kernel memory block using alloc_pages(), memory will be wasted if
* chunk size is not aligned. percpu-km code will whine about it.
*/
#if defined(CONFIG_SMP) && defined(CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK)
#error "contiguous percpu allocation is incompatible with paged first chunk"
#endif
#include <linux/log2.h>
static int pcpu_populate_chunk(struct pcpu_chunk *chunk,
int page_start, int page_end, gfp_t gfp)
{
return 0;
}
static void pcpu_depopulate_chunk(struct pcpu_chunk *chunk,
int page_start, int page_end)
{
/* nada */
}
static struct pcpu_chunk *pcpu_create_chunk(gfp_t gfp)
{
const int nr_pages = pcpu_group_sizes[0] >> PAGE_SHIFT;
struct pcpu_chunk *chunk;
struct page *pages;
int i;
chunk = pcpu_alloc_chunk(gfp);
if (!chunk)
return NULL;
pages = alloc_pages(gfp, order_base_2(nr_pages));
if (!pages) {
pcpu_free_chunk(chunk);
return NULL;
}
for (i = 0; i < nr_pages; i++)
pcpu_set_page_chunk(nth_page(pages, i), chunk);
chunk->data = pages;
chunk->base_addr = page_address(pages) - pcpu_group_offsets[0];
spin_lock_irq(&pcpu_lock);
pcpu_chunk_populated(chunk, 0, nr_pages, false);
spin_unlock_irq(&pcpu_lock);
pcpu_stats_chunk_alloc();
trace_percpu_create_chunk(chunk->base_addr);
return chunk;
}
static void pcpu_destroy_chunk(struct pcpu_chunk *chunk)
{
const int nr_pages = pcpu_group_sizes[0] >> PAGE_SHIFT;
if (!chunk)
return;
pcpu_stats_chunk_dealloc();
trace_percpu_destroy_chunk(chunk->base_addr);
if (chunk->data)
__free_pages(chunk->data, order_base_2(nr_pages));
pcpu_free_chunk(chunk);
}
static struct page *pcpu_addr_to_page(void *addr)
{
return virt_to_page(addr);
}
static int __init pcpu_verify_alloc_info(const struct pcpu_alloc_info *ai)
{
size_t nr_pages, alloc_pages;
/* all units must be in a single group */
if (ai->nr_groups != 1) {
pr_crit("can't handle more than one group\n");
return -EINVAL;
}
nr_pages = (ai->groups[0].nr_units * ai->unit_size) >> PAGE_SHIFT;
alloc_pages = roundup_pow_of_two(nr_pages);
if (alloc_pages > nr_pages)
pr_warn("wasting %zu pages per chunk\n",
alloc_pages - nr_pages);
return 0;
}
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