linux/tools/testing/selftests/bpf/progs/test_global_func14.c

// SPDX-License-Identifier: GPL-2.0-only
#include <stddef.h>
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>

struct S;

__noinline int foo(const struct S *s)
{
	if (s)
		return bpf_get_prandom_u32() < *(const int *) s;

	return 0;
}

SEC("cgroup_skb/ingress")
int test_cls(struct __sk_buff *skb)
{

	return foo(NULL);
}
selftests/bpf: Add unit tests for pointers in global functions 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 2021-02-13 00:56:42 +04:00			`// SPDX-License-Identifier: GPL-2.0-only`
			`#include <stddef.h>`
			`#include <linux/bpf.h>`
			`#include <bpf/bpf_helpers.h>`

			`struct S;`

			`__noinline int foo(const struct S *s)`
			`{`
			`if (s)`
			`return bpf_get_prandom_u32() < (const int ) s;`

			`return 0;`
			`}`

			`SEC("cgroup_skb/ingress")`
			`int test_cls(struct __sk_buff *skb)`
			`{`

			`return foo(NULL);`
			`}`