Add a simple big 16MB array and validate access to the very last byte of
it to make sure that kernel supports > KMALLOC_MAX_SIZE value_size for
BPF array maps (which are backing .bss in this case).
Signed-off-by: Andrii Nakryiko <andrii@xxxxxxxxxx>
---
tools/testing/selftests/bpf/prog_tests/skeleton.c | 2 ++
tools/testing/selftests/bpf/progs/test_skeleton.c | 4 ++++
2 files changed, 6 insertions(+)
diff --git a/tools/testing/selftests/bpf/prog_tests/skeleton.c b/tools/testing/selftests/bpf/prog_tests/skeleton.c
index 180afd632f4c..99dac5292b41 100644
--- a/tools/testing/selftests/bpf/prog_tests/skeleton.c
+++ b/tools/testing/selftests/bpf/prog_tests/skeleton.c
@@ -122,6 +122,8 @@ void test_skeleton(void)
ASSERT_EQ(skel->bss->out_mostly_var, 123, "out_mostly_var");
+ ASSERT_EQ(bss->huge_arr[ARRAY_SIZE(bss->huge_arr) - 1], 123, "huge_arr");
+
elf_bytes = test_skeleton__elf_bytes(&elf_bytes_sz);
ASSERT_OK_PTR(elf_bytes, "elf_bytes");
ASSERT_GE(elf_bytes_sz, 0, "elf_bytes_sz");
diff --git a/tools/testing/selftests/bpf/progs/test_skeleton.c b/tools/testing/selftests/bpf/progs/test_skeleton.c
index 1b1187d2967b..1a4e93f6d9df 100644
--- a/tools/testing/selftests/bpf/progs/test_skeleton.c
+++ b/tools/testing/selftests/bpf/progs/test_skeleton.c
@@ -51,6 +51,8 @@ int out_dynarr[4] SEC(".data.dyn") = { 1, 2, 3, 4 };
int read_mostly_var __read_mostly;
int out_mostly_var;
+char huge_arr[16 * 1024 * 1024];
+
SEC("raw_tp/sys_enter")
int handler(const void *ctx)
{
@@ -71,6 +73,8 @@ int handler(const void *ctx)
out_mostly_var = read_mostly_var;
+ huge_arr[sizeof(huge_arr) - 1] = 123;
+
return 0;
}
--
2.30.2
