From 196e8ca74886c433dcfc64a809707074b936aaf5 Mon Sep 17 00:00:00 2001 From: Daniel Borkmann Date: Wed, 20 Nov 2019 23:04:44 +0100 Subject: bpf: Switch bpf_map_{area_alloc,area_mmapable_alloc}() to u64 size Given we recently extended the original bpf_map_area_alloc() helper in commit fc9702273e2e ("bpf: Add mmap() support for BPF_MAP_TYPE_ARRAY"), we need to apply the same logic as in ff1c08e1f74b ("bpf: Change size to u64 for bpf_map_{area_alloc, charge_init}()"). To avoid conflicts, extend it for bpf-next. Reported-by: Stephen Rothwell Signed-off-by: Daniel Borkmann --- kernel/bpf/syscall.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) (limited to 'kernel') diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index 17f4254495f2..b51ecb9644d0 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -128,7 +128,7 @@ static struct bpf_map *find_and_alloc_map(union bpf_attr *attr) return map; } -static void *__bpf_map_area_alloc(size_t size, int numa_node, bool mmapable) +static void *__bpf_map_area_alloc(u64 size, int numa_node, bool mmapable) { /* We really just want to fail instead of triggering OOM killer * under memory pressure, therefore we set __GFP_NORETRY to kmalloc, @@ -143,6 +143,9 @@ static void *__bpf_map_area_alloc(size_t size, int numa_node, bool mmapable) const gfp_t flags = __GFP_NOWARN | __GFP_ZERO; void *area; + if (size >= SIZE_MAX) + return NULL; + /* kmalloc()'ed memory can't be mmap()'ed */ if (!mmapable && size <= (PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER)) { area = kmalloc_node(size, GFP_USER | __GFP_NORETRY | flags, @@ -160,12 +163,12 @@ static void *__bpf_map_area_alloc(size_t size, int numa_node, bool mmapable) flags, __builtin_return_address(0)); } -void *bpf_map_area_alloc(size_t size, int numa_node) +void *bpf_map_area_alloc(u64 size, int numa_node) { return __bpf_map_area_alloc(size, numa_node, false); } -void *bpf_map_area_mmapable_alloc(size_t size, int numa_node) +void *bpf_map_area_mmapable_alloc(u64 size, int numa_node) { return __bpf_map_area_alloc(size, numa_node, true); } @@ -214,7 +217,7 @@ static void bpf_uncharge_memlock(struct user_struct *user, u32 pages) atomic_long_sub(pages, &user->locked_vm); } -int bpf_map_charge_init(struct bpf_map_memory *mem, size_t size) +int bpf_map_charge_init(struct bpf_map_memory *mem, u64 size) { u32 pages = round_up(size, PAGE_SIZE) >> PAGE_SHIFT; struct user_struct *user; -- cgit v1.2.3-59-g8ed1b