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selftests/bpf: Add uprobe context ip register change test

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Adding test to check we can change the application execution
through instruction pointer change through uprobe program.

It's x86_64 specific test.

Acked-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/r/20250916215301.664963-5-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Jiri Olsa 2025-09-16 23:52:59 +02:00 committed by Alexei Starovoitov
parent 7f8a05c5d3
commit 6a4ea0d1cb
2 changed files with 56 additions and 0 deletions
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42
tools/testing/selftests/bpf/prog_tests/uprobe.c
View File

@ -190,10 +190,52 @@ static void regs_common(void)
test_uprobe__destroy(skel);
}
static noinline unsigned long uprobe_regs_change_ip_1(void)
{
return 0xc0ffee;
}
static noinline unsigned long uprobe_regs_change_ip_2(void)
{
return 0xdeadbeef;
}
static void regs_ip(void)
{
LIBBPF_OPTS(bpf_uprobe_opts, uprobe_opts);
struct test_uprobe *skel;
unsigned long ret;
skel = test_uprobe__open_and_load();
if (!ASSERT_OK_PTR(skel, "skel_open"))
return;
skel->bss->my_pid = getpid();
skel->bss->ip = (unsigned long) uprobe_regs_change_ip_2;
uprobe_opts.func_name = "uprobe_regs_change_ip_1";
skel->links.test_regs_change_ip = bpf_program__attach_uprobe_opts(
skel->progs.test_regs_change_ip,
-1,
"/proc/self/exe",
0 /* offset */,
&uprobe_opts);
if (!ASSERT_OK_PTR(skel->links.test_regs_change_ip, "bpf_program__attach_uprobe_opts"))
goto cleanup;
ret = uprobe_regs_change_ip_1();
ASSERT_EQ(ret, 0xdeadbeef, "ret");
cleanup:
test_uprobe__destroy(skel);
}
static void test_uprobe_regs_change(void)
{
if (test__start_subtest("regs_change_common"))
regs_common();
if (test__start_subtest("regs_change_ip"))
regs_ip();
}
#else
static void test_uprobe_regs_change(void) { }

14
tools/testing/selftests/bpf/progs/test_uprobe.c
View File

@ -82,4 +82,18 @@ int BPF_UPROBE(test_regs_change)
ctx->si = regs.si;
return 0;
}
unsigned long ip;
SEC("uprobe")
int BPF_UPROBE(test_regs_change_ip)
{
pid_t pid = bpf_get_current_pid_tgid() >> 32;
if (pid != my_pid)
return 0;
ctx->ip = ip;
return 0;
}
#endif