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fb66223a24
We need to also export the kfunc set to the syscall program type, and then add a couple of eBPF programs that are testing those calls. The first one checks for valid access, and the second one is OK from a static analysis point of view but fails at run time because we are trying to access outside of the allocated memory. Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Link: https://lore.kernel.org/r/20220906151303.2780789-5-benjamin.tissoires@redhat.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>
39 lines
868 B
C
39 lines
868 B
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2021 Facebook */
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#include <vmlinux.h>
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#include <bpf/bpf_helpers.h>
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extern void bpf_kfunc_call_test_mem_len_pass1(void *mem, int len) __ksym;
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struct syscall_test_args {
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__u8 data[16];
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size_t size;
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};
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SEC("?syscall")
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int kfunc_syscall_test_fail(struct syscall_test_args *args)
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{
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bpf_kfunc_call_test_mem_len_pass1(&args->data, sizeof(*args) + 1);
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return 0;
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}
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SEC("?syscall")
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int kfunc_syscall_test_null_fail(struct syscall_test_args *args)
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{
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/* Must be called with args as a NULL pointer
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* we do not check for it to have the verifier consider that
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* the pointer might not be null, and so we can load it.
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*
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* So the following can not be added:
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*
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* if (args)
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* return -22;
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*/
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bpf_kfunc_call_test_mem_len_pass1(args, sizeof(*args));
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return 0;
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}
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char _license[] SEC("license") = "GPL";
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