diff options
Diffstat (limited to 'tools/testing/selftests/bpf/progs/test_log_fixup.c')
-rw-r--r-- | tools/testing/selftests/bpf/progs/test_log_fixup.c | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/test_log_fixup.c b/tools/testing/selftests/bpf/progs/test_log_fixup.c new file mode 100644 index 000000000..60450cb0e --- /dev/null +++ b/tools/testing/selftests/bpf/progs/test_log_fixup.c @@ -0,0 +1,64 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2022 Meta Platforms, Inc. and affiliates. */ + +#include <linux/bpf.h> +#include <bpf/bpf_helpers.h> +#include <bpf/bpf_core_read.h> + +struct task_struct___bad { + int pid; + int fake_field; + void *fake_field_subprog; +} __attribute__((preserve_access_index)); + +SEC("?raw_tp/sys_enter") +int bad_relo(const void *ctx) +{ + static struct task_struct___bad *t; + + return bpf_core_field_size(t->fake_field); +} + +static __noinline int bad_subprog(void) +{ + static struct task_struct___bad *t; + + /* ugliness below is a field offset relocation */ + return (void *)&t->fake_field_subprog - (void *)t; +} + +SEC("?raw_tp/sys_enter") +int bad_relo_subprog(const void *ctx) +{ + static struct task_struct___bad *t; + + return bad_subprog() + bpf_core_field_size(t->pid); +} + +struct { + __uint(type, BPF_MAP_TYPE_ARRAY); + __uint(max_entries, 1); + __type(key, int); + __type(value, int); +} existing_map SEC(".maps"); + +struct { + __uint(type, BPF_MAP_TYPE_ARRAY); + __uint(max_entries, 1); + __type(key, int); + __type(value, int); +} missing_map SEC(".maps"); + +SEC("?raw_tp/sys_enter") +int use_missing_map(const void *ctx) +{ + int zero = 0, *value; + + value = bpf_map_lookup_elem(&existing_map, &zero); + + value = bpf_map_lookup_elem(&missing_map, &zero); + + return value != NULL; +} + +char _license[] SEC("license") = "GPL"; |