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Revert "selftests/bpf: Add test for bpf_timer overwriting crash"

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This reverts commit b0028e1cc1faf2e5d88ad4065590aca90d650182 which is
commit a7e75016a0 upstream.

It will break the bpf self-tests build with:
progs/timer_crash.c:8:19: error: field has incomplete type 'struct bpf_timer'
        struct bpf_timer timer;
                         ^
/home/ubuntu/linux/tools/testing/selftests/bpf/tools/include/bpf/bpf_helper_defs.h:39:8:
note: forward declaration of 'struct bpf_timer'
struct bpf_timer;
       ^
1 error generated.

This test can only be built with 5.17 and newer kernels.

Signed-off-by: Po-Hsu Lin <po-hsu.lin@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Po-Hsu Lin 2022-07-07 17:42:07 +08:00 • committed by Justin Hammond
parent 86efe4e0db
commit 530f6e871e
2 changed files with 0 additions and 86 deletions
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32
tools/testing/selftests/bpf/prog_tests/timer_crash.c
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@ -1,32 +0,0 @@
// SPDX-License-Identifier: GPL-2.0
#include <test_progs.h>
#include "timer_crash.skel.h"
enum {
MODE_ARRAY,
MODE_HASH,
};
static void test_timer_crash_mode(int mode)
{
struct timer_crash *skel;
skel = timer_crash__open_and_load();
if (!ASSERT_OK_PTR(skel, "timer_crash__open_and_load"))
return;
skel->bss->pid = getpid();
skel->bss->crash_map = mode;
if (!ASSERT_OK(timer_crash__attach(skel), "timer_crash__attach"))
goto end;
usleep(1);
end:
timer_crash__destroy(skel);
}
void test_timer_crash(void)
{
if (test__start_subtest("array"))
test_timer_crash_mode(MODE_ARRAY);
if (test__start_subtest("hash"))
test_timer_crash_mode(MODE_HASH);
}

54
tools/testing/selftests/bpf/progs/timer_crash.c
View file

@ -1,54 +0,0 @@
// SPDX-License-Identifier: GPL-2.0
#include <vmlinux.h>
#include <bpf/bpf_tracing.h>
#include <bpf/bpf_helpers.h>
struct map_elem {
struct bpf_timer timer;
struct bpf_spin_lock lock;
};
struct {
__uint(type, BPF_MAP_TYPE_ARRAY);
__uint(max_entries, 1);
__type(key, int);
__type(value, struct map_elem);
} amap SEC(".maps");
struct {
__uint(type, BPF_MAP_TYPE_HASH);
__uint(max_entries, 1);
__type(key, int);
__type(value, struct map_elem);
} hmap SEC(".maps");
int pid = 0;
int crash_map = 0; /* 0 for amap, 1 for hmap */
SEC("fentry/do_nanosleep")
int sys_enter(void *ctx)
{
struct map_elem *e, value = {};
void *map = crash_map ? (void *)&hmap : (void *)&amap;
if (bpf_get_current_task_btf()->tgid != pid)
return 0;
*(void **)&value = (void *)0xdeadcaf3;
bpf_map_update_elem(map, &(int){0}, &value, 0);
/* For array map, doing bpf_map_update_elem will do a
* check_and_free_timer_in_array, which will trigger the crash if timer
* pointer was overwritten, for hmap we need to use bpf_timer_cancel.
*/
if (crash_map == 1) {
e = bpf_map_lookup_elem(map, &(int){0});
if (!e)
return 0;
bpf_timer_cancel(&e->timer);
}
return 0;
}
char _license[] SEC("license") = "GPL";