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selftests/hid: Add a test for BPF_F_INSERT_HEAD

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Insert 3 programs to check that we are doing the correct thing:
'2', '1', '3' are inserted, but '1' is supposed to be executed first.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Benjamin Tissoires 2022-11-03 16:57:53 +01:00 committed by Jiri Kosina
parent e8445737c0
commit 80e189f2af
2 changed files with 97 additions and 1 deletions
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43
tools/testing/selftests/hid/hid_bpf.c
View File

@ -88,6 +88,7 @@ struct attach_prog_args {
int prog_fd;
unsigned int hid;
int retval;
int insert_head;
};
struct hid_hw_request_syscall_args {
@ -490,6 +491,7 @@ FIXTURE_SETUP(hid_bpf)
struct test_program {
const char *name;
int insert_head;
};
#define LOAD_PROGRAMS(progs) \
load_programs(progs, ARRAY_SIZE(progs), _metadata, self, variant)
@ -539,6 +541,7 @@ static void load_programs(const struct test_program programs[],
args.prog_fd = bpf_program__fd(prog);
args.hid = self->hid_id;
args.insert_head = programs[i].insert_head;
err = bpf_prog_test_run_opts(attach_fd, &tattr);
ASSERT_OK(args.retval) TH_LOG("attach_hid(%s): %d", programs[i].name, args.retval);
}
@ -740,6 +743,46 @@ TEST_F(hid_bpf, test_hid_user_raw_request_call)
ASSERT_EQ(args.data[1], 2);
}
/*
* Attach hid_insert{0,1,2} to the given uhid device,
* retrieve and open the matching hidraw node,
* inject one event in the uhid device,
* check that the programs have been inserted in the correct order.
*/
TEST_F(hid_bpf, test_hid_attach_flags)
{
const struct test_program progs[] = {
{
.name = "hid_test_insert2",
.insert_head = 0,
},
{
.name = "hid_test_insert1",
.insert_head = 1,
},
{
.name = "hid_test_insert3",
.insert_head = 0,
},
};
__u8 buf[10] = {0};
int err;
LOAD_PROGRAMS(progs);
/* inject one event */
buf[0] = 1;
uhid_send_event(_metadata, self->uhid_fd, buf, 6);
/* read the data from hidraw */
memset(buf, 0, sizeof(buf));
err = read(self->hidraw_fd, buf, sizeof(buf));
ASSERT_EQ(err, 6) TH_LOG("read_hidraw");
ASSERT_EQ(buf[1], 1);
ASSERT_EQ(buf[2], 2);
ASSERT_EQ(buf[3], 3);
}
/*
* Attach hid_rdesc_fixup to the given uhid device,
* retrieve and open the matching hidraw node,

55
tools/testing/selftests/hid/progs/hid.c
View File

@ -11,6 +11,7 @@ struct attach_prog_args {
int prog_fd;
unsigned int hid;
int retval;
int insert_head;
};
__u64 callback_check = 52;
@ -49,7 +50,8 @@ int attach_prog(struct attach_prog_args *ctx)
{
ctx->retval = hid_bpf_attach_prog(ctx->hid,
ctx->prog_fd,
0);
ctx->insert_head ? HID_BPF_FLAG_INSERT_HEAD :
HID_BPF_FLAG_NONE);
return 0;
}
@ -141,3 +143,54 @@ int BPF_PROG(hid_rdesc_fixup, struct hid_bpf_ctx *hid_ctx)
return sizeof(rdesc) + 73;
}
SEC("?fmod_ret/hid_bpf_device_event")
int BPF_PROG(hid_test_insert1, struct hid_bpf_ctx *hid_ctx)
{
__u8 *data = hid_bpf_get_data(hid_ctx, 0 /* offset */, 4 /* size */);
if (!data)
return 0; /* EPERM check */
/* we need to be run first */
if (data[2] || data[3])
return -1;
data[1] = 1;
return 0;
}
SEC("?fmod_ret/hid_bpf_device_event")
int BPF_PROG(hid_test_insert2, struct hid_bpf_ctx *hid_ctx)
{
__u8 *data = hid_bpf_get_data(hid_ctx, 0 /* offset */, 4 /* size */);
if (!data)
return 0; /* EPERM check */
/* after insert0 and before insert2 */
if (!data[1] || data[3])
return -1;
data[2] = 2;
return 0;
}
SEC("?fmod_ret/hid_bpf_device_event")
int BPF_PROG(hid_test_insert3, struct hid_bpf_ctx *hid_ctx)
{
__u8 *data = hid_bpf_get_data(hid_ctx, 0 /* offset */, 4 /* size */);
if (!data)
return 0; /* EPERM check */
/* at the end */
if (!data[1] || !data[2])
return -1;
data[3] = 3;
return 0;
}