Commit 24316461 authored by Andrii Nakryiko's avatar Andrii Nakryiko Committed by Alexei Starovoitov
Browse files

selftests/bpf: validate .bss section bigger than 8MB is possible now 



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: default avatarAndrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20220715053146.1291891-5-andrii@kernel.org


Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent 63b8ce77

tools/testing/selftests/bpf/prog_tests/skeleton.c

+2 −0
Original line number Diff line number Diff line
@@ -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");

tools/testing/selftests/bpf/progs/test_skeleton.c

+4 −0
Original line number Diff line number Diff line
@@ -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;

}