8b08807d03
test_global_func9 - check valid pointer's scenarios
test_global_func10 - check that a smaller type cannot be passed as a
larger one
test_global_func11 - check that CTX pointer cannot be passed
test_global_func12 - check access to a null pointer
test_global_func13 - check access to an arbitrary pointer value
test_global_func14 - check that an opaque pointer cannot be passed
test_global_func15 - check that a variable has an unknown value after
it was passed to a global function by pointer
test_global_func16 - check access to uninitialized stack memory
test_global_func_args - check read and write operations through a pointer
Signed-off-by: Dmitrii Banshchikov <me@ubique.spb.ru>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210212205642.620788-5-me@ubique.spb.ru
60 lines
1.6 KiB
C
60 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include "test_progs.h"
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#include "network_helpers.h"
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static __u32 duration;
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static void test_global_func_args0(struct bpf_object *obj)
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{
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int err, i, map_fd, actual_value;
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const char *map_name = "values";
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map_fd = bpf_find_map(__func__, obj, map_name);
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if (CHECK(map_fd < 0, "bpf_find_map", "cannot find BPF map %s: %s\n",
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map_name, strerror(errno)))
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return;
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struct {
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const char *descr;
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int expected_value;
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} tests[] = {
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{"passing NULL pointer", 0},
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{"returning value", 1},
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{"reading local variable", 100 },
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{"writing local variable", 101 },
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{"reading global variable", 42 },
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{"writing global variable", 43 },
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{"writing to pointer-to-pointer", 1 },
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};
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for (i = 0; i < ARRAY_SIZE(tests); ++i) {
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const int expected_value = tests[i].expected_value;
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err = bpf_map_lookup_elem(map_fd, &i, &actual_value);
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CHECK(err || actual_value != expected_value, tests[i].descr,
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"err %d result %d expected %d\n", err, actual_value, expected_value);
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}
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}
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void test_global_func_args(void)
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{
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const char *file = "./test_global_func_args.o";
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__u32 retval;
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struct bpf_object *obj;
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int err, prog_fd;
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err = bpf_prog_load(file, BPF_PROG_TYPE_CGROUP_SKB, &obj, &prog_fd);
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if (CHECK(err, "load program", "error %d loading %s\n", err, file))
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return;
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err = bpf_prog_test_run(prog_fd, 1, &pkt_v4, sizeof(pkt_v4),
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NULL, NULL, &retval, &duration);
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CHECK(err || retval, "pass global func args run",
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"err %d errno %d retval %d duration %d\n",
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err, errno, retval, duration);
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test_global_func_args0(obj);
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bpf_object__close(obj);
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}
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