diff options
author | Andrey Ignatov <rdna@fb.com> | 2019-03-08 15:25:02 -0800 |
---|---|---|
committer | Alexei Starovoitov <ast@kernel.org> | 2019-04-12 13:54:59 -0700 |
commit | 9a1027e52535db1a0adf7831afdfce745dc0a061 (patch) | |
tree | c24f33cb3d04508d0899782e9abbaf142725065d /tools/testing | |
parent | 786047dd08de3334722af036e2827ce3b34205cc (diff) | |
download | linux-9a1027e52535db1a0adf7831afdfce745dc0a061.tar.bz2 |
selftests/bpf: Test file_pos field in bpf_sysctl ctx
Test access to file_pos field of bpf_sysctl context, both read (incl.
narrow read) and write.
# ./test_sysctl
...
Test case: ctx:file_pos sysctl:read read ok .. [PASS]
Test case: ctx:file_pos sysctl:read read ok narrow .. [PASS]
Test case: ctx:file_pos sysctl:read write ok .. [PASS]
...
Signed-off-by: Andrey Ignatov <rdna@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'tools/testing')
-rw-r--r-- | tools/testing/selftests/bpf/test_sysctl.c | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/test_sysctl.c b/tools/testing/selftests/bpf/test_sysctl.c index 95437b72404f..43008aae32d3 100644 --- a/tools/testing/selftests/bpf/test_sysctl.c +++ b/tools/testing/selftests/bpf/test_sysctl.c @@ -30,6 +30,7 @@ struct sysctl_test { const char *sysctl; int open_flags; const char *newval; + const char *oldval; enum { LOAD_REJECT, ATTACH_REJECT, @@ -131,6 +132,64 @@ static struct sysctl_test tests[] = { .result = LOAD_REJECT, }, { + .descr = "ctx:file_pos sysctl:read read ok", + .insns = { + /* If (file_pos == X) */ + BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_1, + offsetof(struct bpf_sysctl, file_pos)), + BPF_JMP_IMM(BPF_JNE, BPF_REG_7, 0, 2), + + /* return ALLOW; */ + BPF_MOV64_IMM(BPF_REG_0, 1), + BPF_JMP_A(1), + + /* else return DENY; */ + BPF_MOV64_IMM(BPF_REG_0, 0), + BPF_EXIT_INSN(), + }, + .attach_type = BPF_CGROUP_SYSCTL, + .sysctl = "kernel/ostype", + .open_flags = O_RDONLY, + .result = SUCCESS, + }, + { + .descr = "ctx:file_pos sysctl:read read ok narrow", + .insns = { + /* If (file_pos == X) */ + BPF_LDX_MEM(BPF_B, BPF_REG_7, BPF_REG_1, + offsetof(struct bpf_sysctl, file_pos)), + BPF_JMP_IMM(BPF_JNE, BPF_REG_7, 0, 2), + + /* return ALLOW; */ + BPF_MOV64_IMM(BPF_REG_0, 1), + BPF_JMP_A(1), + + /* else return DENY; */ + BPF_MOV64_IMM(BPF_REG_0, 0), + BPF_EXIT_INSN(), + }, + .attach_type = BPF_CGROUP_SYSCTL, + .sysctl = "kernel/ostype", + .open_flags = O_RDONLY, + .result = SUCCESS, + }, + { + .descr = "ctx:file_pos sysctl:read write ok", + .insns = { + /* file_pos = X */ + BPF_MOV64_IMM(BPF_REG_0, 2), + BPF_STX_MEM(BPF_W, BPF_REG_1, BPF_REG_0, + offsetof(struct bpf_sysctl, file_pos)), + BPF_MOV64_IMM(BPF_REG_0, 1), + BPF_EXIT_INSN(), + }, + .attach_type = BPF_CGROUP_SYSCTL, + .sysctl = "kernel/ostype", + .open_flags = O_RDONLY, + .oldval = "nux\n", + .result = SUCCESS, + }, + { .descr = "sysctl_get_name sysctl_value:base ok", .insns = { /* sysctl_get_name arg2 (buf) */ @@ -848,6 +907,11 @@ static int access_sysctl(const char *sysctl_path, if (read(fd, buf, sizeof(buf)) == -1) goto err; + if (test->oldval && + strncmp(buf, test->oldval, strlen(test->oldval))) { + log_err("Read value %s != %s", buf, test->oldval); + goto err; + } } else if (test->open_flags == O_WRONLY) { if (!test->newval) { log_err("New value for sysctl is not set"); |