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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /tools/testing/selftests/bpf/progs/test_ksyms_btf_null_check.c | |
parent | Initial commit. (diff) | |
download | linux-upstream/5.10.209.tar.xz linux-upstream/5.10.209.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | tools/testing/selftests/bpf/progs/test_ksyms_btf_null_check.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/test_ksyms_btf_null_check.c b/tools/testing/selftests/bpf/progs/test_ksyms_btf_null_check.c new file mode 100644 index 000000000..8bc8f7c63 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/test_ksyms_btf_null_check.c @@ -0,0 +1,31 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2020 Facebook */ + +#include "vmlinux.h" + +#include <bpf/bpf_helpers.h> + +extern const struct rq runqueues __ksym; /* struct type global var. */ +extern const int bpf_prog_active __ksym; /* int type global var. */ + +SEC("raw_tp/sys_enter") +int handler(const void *ctx) +{ + struct rq *rq; + int *active; + __u32 cpu; + + cpu = bpf_get_smp_processor_id(); + rq = (struct rq *)bpf_per_cpu_ptr(&runqueues, cpu); + active = (int *)bpf_per_cpu_ptr(&bpf_prog_active, cpu); + if (active) { + /* READ_ONCE */ + *(volatile int *)active; + /* !rq has not been tested, so verifier should reject. */ + *(volatile int *)(&rq->cpu); + } + + return 0; +} + +char _license[] SEC("license") = "GPL"; |