diff options
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/Kconfig | 19 | ||||
| -rw-r--r-- | mm/bootmem.c | 12 | ||||
| -rw-r--r-- | mm/bounce.c | 4 | ||||
| -rw-r--r-- | mm/mmap.c | 3 | ||||
| -rw-r--r-- | mm/nommu.c | 3 | ||||
| -rw-r--r-- | mm/page_cgroup.c | 12 | ||||
| -rw-r--r-- | mm/shmem.c | 2 | ||||
| -rw-r--r-- | mm/slab.c | 85 | ||||
| -rw-r--r-- | mm/slub.c | 17 | ||||
| -rw-r--r-- | mm/vmalloc.c | 3 |
10 files changed, 104 insertions, 56 deletions
diff --git a/mm/Kconfig b/mm/Kconfig index c2b57d81e15..71830ba7b98 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -226,6 +226,25 @@ config HAVE_MLOCKED_PAGE_BIT config MMU_NOTIFIER bool +config DEFAULT_MMAP_MIN_ADDR + int "Low address space to protect from user allocation" + default 4096 + help + This is the portion of low virtual memory which should be protected + from userspace allocation. Keeping a user from writing to low pages + can help reduce the impact of kernel NULL pointer bugs. + + For most ia64, ppc64 and x86 users with lots of address space + a value of 65536 is reasonable and should cause no problems. + On arm and other archs it should not be higher than 32768. + Programs which use vm86 functionality would either need additional + permissions from either the LSM or the capabilities module or have + this protection disabled. + + This value can be changed after boot using the + /proc/sys/vm/mmap_min_addr tunable. + + config NOMMU_INITIAL_TRIM_EXCESS int "Turn on mmap() excess space trimming before booting" depends on !MMU diff --git a/mm/bootmem.c b/mm/bootmem.c index daf92713f7d..282df0a09e6 100644 --- a/mm/bootmem.c +++ b/mm/bootmem.c @@ -532,6 +532,9 @@ static void * __init alloc_arch_preferred_bootmem(bootmem_data_t *bdata, unsigned long size, unsigned long align, unsigned long goal, unsigned long limit) { + if (WARN_ON_ONCE(slab_is_available())) + return kzalloc(size, GFP_NOWAIT); + #ifdef CONFIG_HAVE_ARCH_BOOTMEM bootmem_data_t *p_bdata; @@ -662,6 +665,9 @@ static void * __init ___alloc_bootmem_node(bootmem_data_t *bdata, void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size, unsigned long align, unsigned long goal) { + if (WARN_ON_ONCE(slab_is_available())) + return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id); + return ___alloc_bootmem_node(pgdat->bdata, size, align, goal, 0); } @@ -693,6 +699,9 @@ void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size, { void *ptr; + if (WARN_ON_ONCE(slab_is_available())) + return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id); + ptr = alloc_arch_preferred_bootmem(pgdat->bdata, size, align, goal, 0); if (ptr) return ptr; @@ -745,6 +754,9 @@ void * __init __alloc_bootmem_low(unsigned long size, unsigned long align, void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size, unsigned long align, unsigned long goal) { + if (WARN_ON_ONCE(slab_is_available())) + return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id); + return ___alloc_bootmem_node(pgdat->bdata, size, align, goal, ARCH_LOW_ADDRESS_LIMIT); } diff --git a/mm/bounce.c b/mm/bounce.c index 65f5e17e411..4ebe3ea8379 100644 --- a/mm/bounce.c +++ b/mm/bounce.c @@ -191,7 +191,7 @@ static void __blk_queue_bounce(struct request_queue *q, struct bio **bio_orig, /* * is destination page below bounce pfn? */ - if (page_to_pfn(page) <= q->bounce_pfn) + if (page_to_pfn(page) <= queue_bounce_pfn(q)) continue; /* @@ -283,7 +283,7 @@ void blk_queue_bounce(struct request_queue *q, struct bio **bio_orig) * don't waste time iterating over bio segments */ if (!(q->bounce_gfp & GFP_DMA)) { - if (q->bounce_pfn >= blk_max_pfn) + if (queue_bounce_pfn(q) >= blk_max_pfn) return; pool = page_pool; } else { diff --git a/mm/mmap.c b/mm/mmap.c index 8101de490c7..34579b23ebd 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -88,6 +88,9 @@ int sysctl_overcommit_ratio = 50; /* default is 50% */ int sysctl_max_map_count __read_mostly = DEFAULT_MAX_MAP_COUNT; struct percpu_counter vm_committed_as; +/* amount of vm to protect from userspace access */ +unsigned long mmap_min_addr = CONFIG_DEFAULT_MMAP_MIN_ADDR; + /* * Check that a process has enough memory to allocate a new virtual * mapping. 0 means there is enough memory for the allocation to diff --git a/mm/nommu.c b/mm/nommu.c index b571ef70742..2fd2ad5da98 100644 --- a/mm/nommu.c +++ b/mm/nommu.c @@ -69,6 +69,9 @@ int sysctl_max_map_count = DEFAULT_MAX_MAP_COUNT; int sysctl_nr_trim_pages = CONFIG_NOMMU_INITIAL_TRIM_EXCESS; int heap_stack_gap = 0; +/* amount of vm to protect from userspace access */ +unsigned long mmap_min_addr = CONFIG_DEFAULT_MMAP_MIN_ADDR; + atomic_long_t mmap_pages_allocated; EXPORT_SYMBOL(mem_map); diff --git a/mm/page_cgroup.c b/mm/page_cgroup.c index 791905c991d..3dd4a909a1d 100644 --- a/mm/page_cgroup.c +++ b/mm/page_cgroup.c @@ -47,6 +47,8 @@ static int __init alloc_node_page_cgroup(int nid) struct page_cgroup *base, *pc; unsigned long table_size; unsigned long start_pfn, nr_pages, index; + struct page *page; + unsigned int order; start_pfn = NODE_DATA(nid)->node_start_pfn; nr_pages = NODE_DATA(nid)->node_spanned_pages; @@ -55,11 +57,13 @@ static int __init alloc_node_page_cgroup(int nid) return 0; table_size = sizeof(struct page_cgroup) * nr_pages; - - base = __alloc_bootmem_node_nopanic(NODE_DATA(nid), - table_size, PAGE_SIZE, __pa(MAX_DMA_ADDRESS)); - if (!base) + order = get_order(table_size); + page = alloc_pages_node(nid, GFP_NOWAIT | __GFP_ZERO, order); + if (!page) + page = alloc_pages_node(-1, GFP_NOWAIT | __GFP_ZERO, order); + if (!page) return -ENOMEM; + base = page_address(page); for (index = 0; index < nr_pages; index++) { pc = base + index; __init_page_cgroup(pc, start_pfn + index); diff --git a/mm/shmem.c b/mm/shmem.c index b25f95ce3db..0132fbd45a2 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -2659,6 +2659,7 @@ struct file *shmem_file_setup(char *name, loff_t size, unsigned long flags) if (error) goto close_file; #endif + ima_counts_get(file); return file; close_file: @@ -2684,7 +2685,6 @@ int shmem_zero_setup(struct vm_area_struct *vma) if (IS_ERR(file)) return PTR_ERR(file); - ima_shm_check(file); if (vma->vm_file) fput(vma->vm_file); vma->vm_file = file; diff --git a/mm/slab.c b/mm/slab.c index f85831da908..2bd611fa87b 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -315,7 +315,7 @@ static int drain_freelist(struct kmem_cache *cache, struct kmem_list3 *l3, int tofree); static void free_block(struct kmem_cache *cachep, void **objpp, int len, int node); -static int enable_cpucache(struct kmem_cache *cachep); +static int enable_cpucache(struct kmem_cache *cachep, gfp_t gfp); static void cache_reap(struct work_struct *unused); /* @@ -958,12 +958,12 @@ static void __cpuinit start_cpu_timer(int cpu) } static struct array_cache *alloc_arraycache(int node, int entries, - int batchcount) + int batchcount, gfp_t gfp) { int memsize = sizeof(void *) * entries + sizeof(struct array_cache); struct array_cache *nc = NULL; - nc = kmalloc_node(memsize, GFP_KERNEL, node); + nc = kmalloc_node(memsize, gfp, node); if (nc) { nc->avail = 0; nc->limit = entries; @@ -1003,7 +1003,7 @@ static int transfer_objects(struct array_cache *to, #define drain_alien_cache(cachep, alien) do { } while (0) #define reap_alien(cachep, l3) do { } while (0) -static inline struct array_cache **alloc_alien_cache(int node, int limit) +static inline struct array_cache **alloc_alien_cache(int node, int limit, gfp_t gfp) { return (struct array_cache **)BAD_ALIEN_MAGIC; } @@ -1034,7 +1034,7 @@ static inline void *____cache_alloc_node(struct kmem_cache *cachep, static void *____cache_alloc_node(struct kmem_cache *, gfp_t, int); static void *alternate_node_alloc(struct kmem_cache *, gfp_t); -static struct array_cache **alloc_alien_cache(int node, int limit) +static struct array_cache **alloc_alien_cache(int node, int limit, gfp_t gfp) { struct array_cache **ac_ptr; int memsize = sizeof(void *) * nr_node_ids; @@ -1042,14 +1042,14 @@ static struct array_cache **alloc_alien_cache(int node, int limit) if (limit > 1) limit = 12; - ac_ptr = kmalloc_node(memsize, GFP_KERNEL, node); + ac_ptr = kmalloc_node(memsize, gfp, node); if (ac_ptr) { for_each_node(i) { if (i == node || !node_online(i)) { ac_ptr[i] = NULL; continue; } - ac_ptr[i] = alloc_arraycache(node, limit, 0xbaadf00d); + ac_ptr[i] = alloc_arraycache(node, limit, 0xbaadf00d, gfp); if (!ac_ptr[i]) { for (i--; i >= 0; i--) kfree(ac_ptr[i]); @@ -1282,20 +1282,20 @@ static int __cpuinit cpuup_prepare(long cpu) struct array_cache **alien = NULL; nc = alloc_arraycache(node, cachep->limit, - cachep->batchcount); + cachep->batchcount, GFP_KERNEL); if (!nc) goto bad; if (cachep->shared) { shared = alloc_arraycache(node, cachep->shared * cachep->batchcount, - 0xbaadf00d); + 0xbaadf00d, GFP_KERNEL); if (!shared) { kfree(nc); goto bad; } } if (use_alien_caches) { - alien = alloc_alien_cache(node, cachep->limit); + alien = alloc_alien_cache(node, cachep->limit, GFP_KERNEL); if (!alien) { kfree(shared); kfree(nc); @@ -1399,10 +1399,9 @@ static void init_list(struct kmem_cache *cachep, struct kmem_list3 *list, { struct kmem_list3 *ptr; - ptr = kmalloc_node(sizeof(struct kmem_list3), GFP_KERNEL, nodeid); + ptr = kmalloc_node(sizeof(struct kmem_list3), GFP_NOWAIT, nodeid); BUG_ON(!ptr); - local_irq_disable(); memcpy(ptr, list, sizeof(struct kmem_list3)); /* * Do not assume that spinlocks can be initialized via memcpy: @@ -1411,7 +1410,6 @@ static void init_list(struct kmem_cache *cachep, struct kmem_list3 *list, MAKE_ALL_LISTS(cachep, ptr, nodeid); cachep->nodelists[nodeid] = ptr; - local_irq_enable(); } /* @@ -1575,9 +1573,8 @@ void __init kmem_cache_init(void) { struct array_cache *ptr; - ptr = kmalloc(sizeof(struct arraycache_init), GFP_KERNEL); + ptr = kmalloc(sizeof(struct arraycache_init), GFP_NOWAIT); - local_irq_disable(); BUG_ON(cpu_cache_get(&cache_cache) != &initarray_cache.cache); memcpy(ptr, cpu_cache_get(&cache_cache), sizeof(struct arraycache_init)); @@ -1587,11 +1584,9 @@ void __init kmem_cache_init(void) spin_lock_init(&ptr->lock); cache_cache.array[smp_processor_id()] = ptr; - local_irq_enable(); - ptr = kmalloc(sizeof(struct arraycache_init), GFP_KERNEL); + ptr = kmalloc(sizeof(struct arraycache_init), GFP_NOWAIT); - local_irq_disable(); BUG_ON(cpu_cache_get(malloc_sizes[INDEX_AC].cs_cachep) != &initarray_generic.cache); memcpy(ptr, cpu_cache_get(malloc_sizes[INDEX_AC].cs_cachep), @@ -1603,7 +1598,6 @@ void __init kmem_cache_init(void) malloc_sizes[INDEX_AC].cs_cachep->array[smp_processor_id()] = ptr; - local_irq_enable(); } /* 5) Replace the bootstrap kmem_list3's */ { @@ -1627,7 +1621,7 @@ void __init kmem_cache_init(void) struct kmem_cache *cachep; mutex_lock(&cache_chain_mutex); list_for_each_entry(cachep, &cache_chain, next) - if (enable_cpucache(cachep)) + if (enable_cpucache(cachep, GFP_NOWAIT)) BUG(); mutex_unlock(&cache_chain_mutex); } @@ -2064,10 +2058,10 @@ static size_t calculate_slab_order(struct kmem_cache *cachep, return left_over; } -static int __init_refok setup_cpu_cache(struct kmem_cache *cachep) +static int __init_refok setup_cpu_cache(struct kmem_cache *cachep, gfp_t gfp) { if (g_cpucache_up == FULL) - return enable_cpucache(cachep); + return enable_cpucache(cachep, gfp); if (g_cpucache_up == NONE) { /* @@ -2089,7 +2083,7 @@ static int __init_refok setup_cpu_cache(struct kmem_cache *cachep) g_cpucache_up = PARTIAL_AC; } else { cachep->array[smp_processor_id()] = - kmalloc(sizeof(struct arraycache_init), GFP_KERNEL); + kmalloc(sizeof(struct arraycache_init), gfp); if (g_cpucache_up == PARTIAL_AC) { set_up_list3s(cachep, SIZE_L3); @@ -2153,6 +2147,7 @@ kmem_cache_create (const char *name, size_t size, size_t align, { size_t left_over, slab_size, ralign; struct kmem_cache *cachep = NULL, *pc; + gfp_t gfp; /* * Sanity checks... these are all serious usage bugs. @@ -2168,8 +2163,10 @@ kmem_cache_create (const char *name, size_t size, size_t align, * We use cache_chain_mutex to ensure a consistent view of * cpu_online_mask as well. Please see cpuup_callback */ - get_online_cpus(); - mutex_lock(&cache_chain_mutex); + if (slab_is_available()) { + get_online_cpus(); + mutex_lock(&cache_chain_mutex); + } list_for_each_entry(pc, &cache_chain, next) { char tmp; @@ -2278,8 +2275,13 @@ kmem_cache_create (const char *name, size_t size, size_t align, */ align = ralign; + if (slab_is_available()) + gfp = GFP_KERNEL; + else + gfp = GFP_NOWAIT; + /* Get cache's description obj. */ - cachep = kmem_cache_zalloc(&cache_cache, GFP_KERNEL); + cachep = kmem_cache_zalloc(&cache_cache, gfp); if (!cachep) goto oops; @@ -2382,7 +2384,7 @@ kmem_cache_create (const char *name, size_t size, size_t align, cachep->ctor = ctor; cachep->name = name; - if (setup_cpu_cache(cachep)) { + if (setup_cpu_cache(cachep, gfp)) { __kmem_cache_destroy(cachep); cachep = NULL; goto oops; @@ -2394,8 +2396,10 @@ oops: if (!cachep && (flags & SLAB_PANIC)) panic("kmem_cache_create(): failed to create slab `%s'\n", name); - mutex_unlock(&cache_chain_mutex); - put_online_cpus(); + if (slab_is_available()) { + mutex_unlock(&cache_chain_mutex); + put_online_cpus(); + } return cachep; } EXPORT_SYMBOL(kmem_cache_create); @@ -3802,7 +3806,7 @@ EXPORT_SYMBOL_GPL(kmem_cache_name); /* * This initializes kmem_list3 or resizes various caches for all nodes. */ -static int alloc_kmemlist(struct kmem_cache *cachep) +static int alloc_kmemlist(struct kmem_cache *cachep, gfp_t gfp) { int node; struct kmem_list3 *l3; @@ -3812,7 +3816,7 @@ static int alloc_kmemlist(struct kmem_cache *cachep) for_each_online_node(node) { if (use_alien_caches) { - new_alien = alloc_alien_cache(node, cachep->limit); + new_alien = alloc_alien_cache(node, cachep->limit, gfp); if (!new_alien) goto fail; } @@ -3821,7 +3825,7 @@ static int alloc_kmemlist(struct kmem_cache *cachep) if (cachep->shared) { new_shared = alloc_arraycache(node, cachep->shared*cachep->batchcount, - 0xbaadf00d); + 0xbaadf00d, gfp); if (!new_shared) { free_alien_cache(new_alien); goto fail; @@ -3850,7 +3854,7 @@ static int alloc_kmemlist(struct kmem_cache *cachep) free_alien_cache(new_alien); continue; } - l3 = kmalloc_node(sizeof(struct kmem_list3), GFP_KERNEL, node); + l3 = kmalloc_node(sizeof(struct kmem_list3), gfp, node); if (!l3) { free_alien_cache(new_alien); kfree(new_shared); @@ -3906,18 +3910,18 @@ static void do_ccupdate_local(void *info) /* Always called with the cache_chain_mutex held */ static int do_tune_cpucache(struct kmem_cache *cachep, int limit, - int batchcount, int shared) + int batchcount, int shared, gfp_t gfp) { struct ccupdate_struct *new; int i; - new = kzalloc(sizeof(*new), GFP_KERNEL); + new = kzalloc(sizeof(*new), gfp); if (!new) return -ENOMEM; for_each_online_cpu(i) { new->new[i] = alloc_arraycache(cpu_to_node(i), limit, - batchcount); + batchcount, gfp); if (!new->new[i]) { for (i--; i >= 0; i--) kfree(new->new[i]); @@ -3944,11 +3948,11 @@ static int do_tune_cpucache(struct kmem_cache *cachep, int limit, kfree(ccold); } kfree(new); - return alloc_kmemlist(cachep); + return alloc_kmemlist(cachep, gfp); } /* Called with cache_chain_mutex held always */ -static int enable_cpucache(struct kmem_cache *cachep) +static int enable_cpucache(struct kmem_cache *cachep, gfp_t gfp) { int err; int limit, shared; @@ -3994,7 +3998,7 @@ static int enable_cpucache(struct kmem_cache *cachep) if (limit > 32) limit = 32; #endif - err = do_tune_cpucache(cachep, limit, (limit + 1) / 2, shared); + err = do_tune_cpucache(cachep, limit, (limit + 1) / 2, shared, gfp); if (err) printk(KERN_ERR "enable_cpucache failed for %s, error %d.\n", cachep->name, -err); @@ -4300,7 +4304,8 @@ ssize_t slabinfo_write(struct file *file, const char __user * buffer, res = 0; } else { res = do_tune_cpucache(cachep, limit, - batchcount, shared); + batchcount, shared, + GFP_KERNEL); } break; } diff --git a/mm/slub.c b/mm/slub.c index 5e805a6fe36..c1815a63807 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -2557,13 +2557,16 @@ static struct kmem_cache *create_kmalloc_cache(struct kmem_cache *s, if (gfp_flags & SLUB_DMA) flags = SLAB_CACHE_DMA; - down_write(&slub_lock); + /* + * This function is called with IRQs disabled during early-boot on + * single CPU so there's no need to take slub_lock here. + */ if (!kmem_cache_open(s, gfp_flags, name, size, ARCH_KMALLOC_MINALIGN, flags, NULL)) goto panic; list_add(&s->list, &slab_caches); - up_write(&slub_lock); + if (sysfs_slab_add(s)) goto panic; return s; @@ -3021,7 +3024,7 @@ void __init kmem_cache_init(void) * kmem_cache_open for slab_state == DOWN. */ create_kmalloc_cache(&kmalloc_caches[0], "kmem_cache_node", - sizeof(struct kmem_cache_node), GFP_KERNEL); + sizeof(struct kmem_cache_node), GFP_NOWAIT); kmalloc_caches[0].refcount = -1; caches++; @@ -3034,16 +3037,16 @@ void __init kmem_cache_init(void) /* Caches that are not of the two-to-the-power-of size */ if (KMALLOC_MIN_SIZE <= 64) { create_kmalloc_cache(&kmalloc_caches[1], - "kmalloc-96", 96, GFP_KERNEL); + "kmalloc-96", 96, GFP_NOWAIT); caches++; create_kmalloc_cache(&kmalloc_caches[2], - "kmalloc-192", 192, GFP_KERNEL); + "kmalloc-192", 192, GFP_NOWAIT); caches++; } for (i = KMALLOC_SHIFT_LOW; i < SLUB_PAGE_SHIFT; i++) { create_kmalloc_cache(&kmalloc_caches[i], - "kmalloc", 1 << i, GFP_KERNEL); + "kmalloc", 1 << i, GFP_NOWAIT); caches++; } @@ -3080,7 +3083,7 @@ void __init kmem_cache_init(void) /* Provide the correct kmalloc names now that the caches are up */ for (i = KMALLOC_SHIFT_LOW; i < SLUB_PAGE_SHIFT; i++) kmalloc_caches[i]. name = - kasprintf(GFP_KERNEL, "kmalloc-%d", 1 << i); + kasprintf(GFP_NOWAIT, "kmalloc-%d", 1 << i); #ifdef CONFIG_SMP register_cpu_notifier(&slab_notifier); diff --git a/mm/vmalloc.c b/mm/vmalloc.c index 083716ea38c..323513858c2 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -23,7 +23,6 @@ #include <linux/rbtree.h> #include <linux/radix-tree.h> #include <linux/rcupdate.h> -#include <linux/bootmem.h> #include <linux/pfn.h> #include <asm/atomic.h> @@ -1032,7 +1031,7 @@ void __init vmalloc_init(void) /* Import existing vmlist entries. */ for (tmp = vmlist; tmp; tmp = tmp->next) { - va = alloc_bootmem(sizeof(struct vmap_area)); + va = kzalloc(sizeof(struct vmap_area), GFP_NOWAIT); va->flags = tmp->flags | VM_VM_AREA; va->va_start = (unsigned long)tmp->addr; va->va_end = va->va_start + tmp->size; |