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selftests/bpf: Test a uptr struct spanning across pages.

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This patch tests the case when uptr has a struct spanning across two
pages. It is not supported now and EOPNOTSUPP is expected from the
syscall update_elem.

It also tests the whole uptr struct located exactly at the
end of a page and ensures that this case is accepted by update_elem.

Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://lore.kernel.org/r/20241023234759.860539-10-martin.lau@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Martin KaFai Lau 2024-10-23 16:47:56 -07:00 committed by Alexei Starovoitov
parent 4579b4a427
commit 51fff40833
1 changed files with 43 additions and 0 deletions
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43
tools/testing/selftests/bpf/prog_tests/task_local_storage.c
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@ -8,6 +8,7 @@
#include <sys/syscall.h> /* For SYS_xxx definitions */
#include <sys/types.h>
#include <sys/eventfd.h>
#include <sys/mman.h>
#include <test_progs.h>
#include "task_local_storage_helpers.h"
#include "task_local_storage.skel.h"
@ -367,6 +368,46 @@ static void test_uptr_basic(void)
close(parent_task_fd);
}
static void test_uptr_across_pages(void)
{
int page_size = getpagesize();
struct value_type value = {};
struct task_ls_uptr *skel;
int err, task_fd, map_fd;
void *mem;
task_fd = sys_pidfd_open(getpid(), 0);
if (!ASSERT_OK_FD(task_fd, "task_fd"))
return;
mem = mmap(NULL, page_size * 2, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (!ASSERT_OK_PTR(mem, "mmap(page_size * 2)")) {
close(task_fd);
return;
}
skel = task_ls_uptr__open_and_load();
if (!ASSERT_OK_PTR(skel, "skel_open_and_load"))
goto out;
map_fd = bpf_map__fd(skel->maps.datamap);
value.udata = mem + page_size - offsetof(struct user_data, b);
err = bpf_map_update_elem(map_fd, &task_fd, &value, 0);
if (!ASSERT_ERR(err, "update_elem(udata)"))
goto out;
ASSERT_EQ(errno, EOPNOTSUPP, "errno");
value.udata = mem + page_size - sizeof(struct user_data);
err = bpf_map_update_elem(map_fd, &task_fd, &value, 0);
ASSERT_OK(err, "update_elem(udata)");
out:
task_ls_uptr__destroy(skel);
close(task_fd);
munmap(mem, page_size * 2);
}
void test_task_local_storage(void)
{
if (test__start_subtest("sys_enter_exit"))
@ -379,4 +420,6 @@ void test_task_local_storage(void)
test_nodeadlock();
if (test__start_subtest("uptr_basic"))
test_uptr_basic();
if (test__start_subtest("uptr_across_pages"))
test_uptr_across_pages();
}