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author | Toke Høiland-Jørgensen <toke@redhat.com> | 2020-09-29 14:45:57 +0200 |
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committer | Alexei Starovoitov <ast@kernel.org> | 2020-09-29 13:09:24 -0700 |
commit | bee4b7e6268be9267e288936f5b1215fec3d4368 (patch) | |
tree | 1963385635b40446667c35f61b2bf74f1c9779d1 /tools/testing/selftests/bpf/progs/fmod_ret_freplace.c | |
parent | 17d3f386757609223aa02342d29526daa67efafc (diff) | |
download | lwn-bee4b7e6268be9267e288936f5b1215fec3d4368.tar.gz lwn-bee4b7e6268be9267e288936f5b1215fec3d4368.zip |
selftests: Add selftest for disallowing modify_return attachment to freplace
This adds a selftest that ensures that modify_return tracing programs
cannot be attached to freplace programs. The security_ prefix is added to
the freplace program because that would otherwise let it pass the check for
modify_return.
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/160138355713.48470.3811074984255709369.stgit@toke.dk
Diffstat (limited to 'tools/testing/selftests/bpf/progs/fmod_ret_freplace.c')
-rw-r--r-- | tools/testing/selftests/bpf/progs/fmod_ret_freplace.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/fmod_ret_freplace.c b/tools/testing/selftests/bpf/progs/fmod_ret_freplace.c new file mode 100644 index 000000000000..c8943ccee6c0 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/fmod_ret_freplace.c @@ -0,0 +1,14 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <linux/bpf.h> +#include <bpf/bpf_helpers.h> +#include <bpf/bpf_tracing.h> + +volatile __u64 test_fmod_ret = 0; +SEC("fmod_ret/security_new_get_constant") +int BPF_PROG(fmod_ret_test, long val, int ret) +{ + test_fmod_ret = 1; + return 120; +} + +char _license[] SEC("license") = "GPL"; |