[PATCH bpf-next 5/9] selftests/bpf: Attach to fopen()/fclose() in uprobe_autoattach

[Ilya Leoshkevich <iii@linux.ibm.com>]

malloc() and free() may be completely replaced by sanitizers, use
fopen() and fclose() instead.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
 .../selftests/bpf/prog_tests/uprobe_autoattach.c     | 12 ++++++------
 .../selftests/bpf/progs/test_uprobe_autoattach.c     | 10 +++++-----
 2 files changed, 11 insertions(+), 11 deletions(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/uprobe_autoattach.c b/tools/testing/selftests/bpf/prog_tests/uprobe_autoattach.c
index 82807def0d24..b862948f95a8 100644
--- a/tools/testing/selftests/bpf/prog_tests/uprobe_autoattach.c
+++ b/tools/testing/selftests/bpf/prog_tests/uprobe_autoattach.c
@@ -16,10 +16,10 @@ static noinline int autoattach_trigger_func(int arg1, int arg2, int arg3,
 
 void test_uprobe_autoattach(void)
 {
+	const char *devnull_str = "/dev/null";
 	struct test_uprobe_autoattach *skel;
 	int trigger_ret;
-	size_t malloc_sz = 1;
-	char *mem;
+	FILE *devnull;
 
 	skel = test_uprobe_autoattach__open_and_load();
 	if (!ASSERT_OK_PTR(skel, "skel_open"))
@@ -36,16 +36,16 @@ void test_uprobe_autoattach(void)
 	skel->bss->test_pid = getpid();
 
 	/* trigger & validate shared library u[ret]probes attached by name */
-	mem = malloc(malloc_sz);
+	devnull = fopen(devnull_str, "r");
 
 	ASSERT_EQ(skel->bss->uprobe_byname_parm1, 1, "check_uprobe_byname_parm1");
 	ASSERT_EQ(skel->bss->uprobe_byname_ran, 1, "check_uprobe_byname_ran");
 	ASSERT_EQ(skel->bss->uretprobe_byname_rc, trigger_ret, "check_uretprobe_byname_rc");
 	ASSERT_EQ(skel->bss->uretprobe_byname_ret, trigger_ret, "check_uretprobe_byname_ret");
 	ASSERT_EQ(skel->bss->uretprobe_byname_ran, 2, "check_uretprobe_byname_ran");
-	ASSERT_EQ(skel->bss->uprobe_byname2_parm1, malloc_sz, "check_uprobe_byname2_parm1");
+	ASSERT_EQ(skel->bss->uprobe_byname2_parm1, devnull_str, "check_uprobe_byname2_parm1");
 	ASSERT_EQ(skel->bss->uprobe_byname2_ran, 3, "check_uprobe_byname2_ran");
-	ASSERT_EQ(skel->bss->uretprobe_byname2_rc, mem, "check_uretprobe_byname2_rc");
+	ASSERT_EQ(skel->bss->uretprobe_byname2_rc, (void *)devnull, "check_uretprobe_byname2_rc");
 	ASSERT_EQ(skel->bss->uretprobe_byname2_ran, 4, "check_uretprobe_byname2_ran");
 
 	ASSERT_EQ(skel->bss->a[0], 1, "arg1");
@@ -67,7 +67,7 @@ void test_uprobe_autoattach(void)
 	ASSERT_EQ(skel->bss->a[7], 8, "arg8");
 #endif
 
-	free(mem);
+	fclose(devnull);
 cleanup:
 	test_uprobe_autoattach__destroy(skel);
 }
diff --git a/tools/testing/selftests/bpf/progs/test_uprobe_autoattach.c b/tools/testing/selftests/bpf/progs/test_uprobe_autoattach.c
index 774ddeb45898..72f5e7a82c58 100644
--- a/tools/testing/selftests/bpf/progs/test_uprobe_autoattach.c
+++ b/tools/testing/selftests/bpf/progs/test_uprobe_autoattach.c
@@ -13,9 +13,9 @@ int uprobe_byname_ran = 0;
 int uretprobe_byname_rc = 0;
 int uretprobe_byname_ret = 0;
 int uretprobe_byname_ran = 0;
-size_t uprobe_byname2_parm1 = 0;
+void *uprobe_byname2_parm1 = NULL;
 int uprobe_byname2_ran = 0;
-char *uretprobe_byname2_rc = NULL;
+void *uretprobe_byname2_rc = NULL;
 int uretprobe_byname2_ran = 0;
 
 int test_pid;
@@ -88,7 +88,7 @@ int BPF_URETPROBE(handle_uretprobe_byname, int ret)
 }
 
 
-SEC("uprobe/libc.so.6:malloc")
+SEC("uprobe/libc.so.6:fopen")
 int handle_uprobe_byname2(struct pt_regs *ctx)
 {
 	int pid = bpf_get_current_pid_tgid() >> 32;
@@ -96,12 +96,12 @@ int handle_uprobe_byname2(struct pt_regs *ctx)
 	/* ignore irrelevant invocations */
 	if (test_pid != pid)
 		return 0;
-	uprobe_byname2_parm1 = PT_REGS_PARM1_CORE(ctx);
+	uprobe_byname2_parm1 = (void *)(long)PT_REGS_PARM1_CORE(ctx);
 	uprobe_byname2_ran = 3;
 	return 0;
 }
 
-SEC("uretprobe/libc.so.6:malloc")
+SEC("uretprobe/libc.so.6:fopen")
 int handle_uretprobe_byname2(struct pt_regs *ctx)
 {
 	int pid = bpf_get_current_pid_tgid() >> 32;
-- 
2.39.1