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| author | David Miller <davem@davemloft.net> | 2017-04-20 21:20:16 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-04-21 21:16:46 +0200 |
| commit | 89087c456fb5cb5e534edf1c30568a8baae4c906 (patch) | |
| tree | ed26db1aef0514d46d969bf21b45e0c52f7d7972 | |
| parent | net: ipv6: RTF_PCPU should not be settable from userspace (diff) | |
| download | linux-89087c456fb5cb5e534edf1c30568a8baae4c906.tar.xz linux-89087c456fb5cb5e534edf1c30568a8baae4c906.zip | |
bpf: Fix values type used in test_maps
Maps of per-cpu type have their value element size adjusted to 8 if it
is specified smaller during various map operations.
This makes test_maps as a 32-bit binary fail, in fact the kernel
writes past the end of the value's array on the user's stack.
To be quite honest, I think the kernel should reject creation of a
per-cpu map that doesn't have a value size of at least 8 if that's
what the kernel is going to silently adjust to later.
If the user passed something smaller, it is a sizeof() calcualtion
based upon the type they will actually use (just like in this testcase
code) in later calls to the map operations.
Fixes: df570f577231 ("samples/bpf: unit test for BPF_MAP_TYPE_PERCPU_ARRAY")
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
| -rw-r--r-- | tools/testing/selftests/bpf/test_maps.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/tools/testing/selftests/bpf/test_maps.c b/tools/testing/selftests/bpf/test_maps.c index a0aa2009b0e0..20f1871874df 100644 --- a/tools/testing/selftests/bpf/test_maps.c +++ b/tools/testing/selftests/bpf/test_maps.c @@ -282,7 +282,7 @@ static void test_arraymap_percpu(int task, void *data) { unsigned int nr_cpus = bpf_num_possible_cpus(); int key, next_key, fd, i; - long values[nr_cpus]; + long long values[nr_cpus]; fd = bpf_create_map(BPF_MAP_TYPE_PERCPU_ARRAY, sizeof(key), sizeof(values[0]), 2, 0); @@ -340,7 +340,7 @@ static void test_arraymap_percpu_many_keys(void) * allocator more than anything else */ unsigned int nr_keys = 2000; - long values[nr_cpus]; + long long values[nr_cpus]; int key, fd, i; fd = bpf_create_map(BPF_MAP_TYPE_PERCPU_ARRAY, sizeof(key), |