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bpf: Fix bug in mmap() implementation for BPF array map 

mmap() subsystem allows user-space application to memory-map region with
initial page offset. This wasn't taken into account in initial implementation
of BPF array memory-mapping. This would result in wrong pages, not taking into
account requested page shift, being memory-mmaped into user-space. This patch
fixes this gap and adds a test for such scenario.

Fixes: fc9702273e ("bpf: Add mmap() support for BPF_MAP_TYPE_ARRAY")
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20200512235925.3817805-1-andriin@fb.com
alistair/sunxi64-5.7-dsi
Andrii Nakryiko 2020-05-12 16:59:25 -07:00 committed by Alexei Starovoitov
parent 23ad04669f
commit 333291ce50
2 changed files with 14 additions and 1 deletions
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7
kernel/bpf/arraymap.c
View File

@ -486,7 +486,12 @@ static int array_map_mmap(struct bpf_map *map, struct vm_area_struct *vma)
if (!(map->map_flags & BPF_F_MMAPABLE))
return -EINVAL;
return remap_vmalloc_range(vma, array_map_vmalloc_addr(array), pgoff);
if (vma->vm_pgoff * PAGE_SIZE + (vma->vm_end - vma->vm_start) >
PAGE_ALIGN((u64)array->map.max_entries * array->elem_size))
return -EINVAL;
return remap_vmalloc_range(vma, array_map_vmalloc_addr(array),
vma->vm_pgoff + pgoff);
}
const struct bpf_map_ops array_map_ops = {

8
tools/testing/selftests/bpf/prog_tests/mmap.c
View File

@ -217,6 +217,14 @@ void test_mmap(void)
munmap(tmp2, 4 * page_size);
/* map all 4 pages, but with pg_off=1 page, should fail */
tmp1 = mmap(NULL, 4 * page_size, PROT_READ, MAP_SHARED | MAP_FIXED,
data_map_fd, page_size /* initial page shift */);
if (CHECK(tmp1 != MAP_FAILED, "adv_mmap7", "unexpected success")) {
munmap(tmp1, 4 * page_size);
goto cleanup;
}
tmp1 = mmap(NULL, map_sz, PROT_READ, MAP_SHARED, data_map_fd, 0);
if (CHECK(tmp1 == MAP_FAILED, "last_mmap", "failed %d\n", errno))
goto cleanup;