Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next

Andrii Nakryiko says:

====================
bpf-next 2022-08-17

We've added 45 non-merge commits during the last 14 day(s) which contain
a total of 61 files changed, 986 insertions(+), 372 deletions(-).

The main changes are:

1) New bpf_ktime_get_tai_ns() BPF helper to access CLOCK_TAI, from Kurt
   Kanzenbach and Jesper Dangaard Brouer.

2) Few clean ups and improvements for libbpf 1.0, from Andrii Nakryiko.

3) Expose crash_kexec() as kfunc for BPF programs, from Artem Savkov.

4) Add ability to define sleepable-only kfuncs, from Benjamin Tissoires.

5) Teach libbpf's bpf_prog_load() and bpf_map_create() to gracefully handle
   unsupported names on old kernels, from Hangbin Liu.

6) Allow opting out from auto-attaching BPF programs by libbpf's BPF skeleton,
   from Hao Luo.

7) Relax libbpf's requirement for shared libs to be marked executable, from
   Henqgi Chen.

8) Improve bpf_iter internals handling of error returns, from Hao Luo.

9) Few accommodations in libbpf to support GCC-BPF quirks, from James Hilliard.

10) Fix BPF verifier logic around tracking dynptr ref_obj_id, from Joanne Koong.

11) bpftool improvements to handle full BPF program names better, from Manu
    Bretelle.

12) bpftool fixes around libcap use, from Quentin Monnet.

13) BPF map internals clean ups and improvements around memory allocations,
    from Yafang Shao.

14) Allow to use cgroup_get_from_file() on cgroupv1, allowing BPF cgroup
    iterator to work on cgroupv1, from Yosry Ahmed.

15) BPF verifier internal clean ups, from Dave Marchevsky and Joanne Koong.

16) Various fixes and clean ups for selftests/bpf and vmtest.sh, from Daniel
    Xu, Artem Savkov, Joanne Koong, Andrii Nakryiko, Shibin Koikkara Reeny.

* https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next: (45 commits)
  selftests/bpf: Few fixes for selftests/bpf built in release mode
  libbpf: Clean up deprecated and legacy aliases
  libbpf: Streamline bpf_attr and perf_event_attr initialization
  libbpf: Fix potential NULL dereference when parsing ELF
  selftests/bpf: Tests libbpf autoattach APIs
  libbpf: Allows disabling auto attach
  selftests/bpf: Fix attach point for non-x86 arches in test_progs/lsm
  libbpf: Making bpf_prog_load() ignore name if kernel doesn't support
  selftests/bpf: Update CI kconfig
  selftests/bpf: Add connmark read test
  selftests/bpf: Add existing connection bpf_*_ct_lookup() test
  bpftool: Clear errno after libcap's checks
  bpf: Clear up confusion in bpf_skb_adjust_room()'s documentation
  bpftool: Fix a typo in a comment
  libbpf: Add names for auxiliary maps
  bpf: Use bpf_map_area_alloc consistently on bpf map creation
  bpf: Make __GFP_NOWARN consistent in bpf map creation
  bpf: Use bpf_map_area_free instread of kvfree
  bpf: Remove unneeded memset in queue_stack_map creation
  libbpf: preserve errno across pr_warn/pr_info/pr_debug
  ...
====================

Link: https://lore.kernel.org/r/20220817215656.1180215-1-andrii@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 65 insertions, 29 deletions

diff --git a/tools/testing/selftests/bpf/progs/dynptr_fail.c b/tools/testing/selftests/bpf/progs/dynptr_fail.c
index 0a26c243e6e9..b0f08ff024fb 100644
--- a/tools/testing/selftests/bpf/progs/dynptr_fail.c
+++ b/tools/testing/selftests/bpf/progs/dynptr_fail.c
@@ -65,7 +65,7 @@ static int get_map_val_dynptr(struct bpf_dynptr *ptr)
 /* Every bpf_ringbuf_reserve_dynptr call must have a corresponding
  * bpf_ringbuf_submit/discard_dynptr call
  */
-SEC("?raw_tp/sys_nanosleep")
+SEC("?raw_tp")
 int ringbuf_missing_release1(void *ctx)
 {
 	struct bpf_dynptr ptr;
@@ -77,7 +77,7 @@ int ringbuf_missing_release1(void *ctx)
 	return 0;
 }
 
-SEC("?raw_tp/sys_nanosleep")
+SEC("?raw_tp")
 int ringbuf_missing_release2(void *ctx)
 {
 	struct bpf_dynptr ptr1, ptr2;
@@ -112,7 +112,7 @@ static int missing_release_callback_fn(__u32 index, void *data)
 }
 
 /* Any dynptr initialized within a callback must have bpf_dynptr_put called */
-SEC("?raw_tp/sys_nanosleep")
+SEC("?raw_tp")
 int ringbuf_missing_release_callback(void *ctx)
 {
 	bpf_loop(10, missing_release_callback_fn, NULL, 0);
@@ -120,7 +120,7 @@ int ringbuf_missing_release_callback(void *ctx)
 }
 
 /* Can't call bpf_ringbuf_submit/discard_dynptr on a non-initialized dynptr */
-SEC("?raw_tp/sys_nanosleep")
+SEC("?raw_tp")
 int ringbuf_release_uninit_dynptr(void *ctx)
 {
 	struct bpf_dynptr ptr;
@@ -132,7 +132,7 @@ int ringbuf_release_uninit_dynptr(void *ctx)
 }
 
 /* A dynptr can't be used after it has been invalidated */
-SEC("?raw_tp/sys_nanosleep")
+SEC("?raw_tp")
 int use_after_invalid(void *ctx)
 {
 	struct bpf_dynptr ptr;
@@ -151,7 +151,7 @@ int use_after_invalid(void *ctx)
 }
 
 /* Can't call non-dynptr ringbuf APIs on a dynptr ringbuf sample */
-SEC("?raw_tp/sys_nanosleep")
+SEC("?raw_tp")
 int ringbuf_invalid_api(void *ctx)
 {
 	struct bpf_dynptr ptr;
@@ -173,7 +173,7 @@ done:
 }
 
 /* Can't add a dynptr to a map */
-SEC("?raw_tp/sys_nanosleep")
+SEC("?raw_tp")
 int add_dynptr_to_map1(void *ctx)
 {
 	struct bpf_dynptr ptr;
@@ -190,7 +190,7 @@ int add_dynptr_to_map1(void *ctx)
 }
 
 /* Can't add a struct with an embedded dynptr to a map */
-SEC("?raw_tp/sys_nanosleep")
+SEC("?raw_tp")
 int add_dynptr_to_map2(void *ctx)
 {
 	struct test_info x;
@@ -207,7 +207,7 @@ int add_dynptr_to_map2(void *ctx)
 }
 
 /* A data slice can't be accessed out of bounds */
-SEC("?raw_tp/sys_nanosleep")
+SEC("?raw_tp")
 int data_slice_out_of_bounds_ringbuf(void *ctx)
 {
 	struct bpf_dynptr ptr;
@@ -227,7 +227,7 @@ done:
 	return 0;
 }
 
-SEC("?raw_tp/sys_nanosleep")
+SEC("?raw_tp")
 int data_slice_out_of_bounds_map_value(void *ctx)
 {
 	__u32 key = 0, map_val;
@@ -247,8 +247,8 @@ int data_slice_out_of_bounds_map_value(void *ctx)
 }
 
 /* A data slice can't be used after it has been released */
-SEC("?raw_tp/sys_nanosleep")
-int data_slice_use_after_release(void *ctx)
+SEC("?raw_tp")
+int data_slice_use_after_release1(void *ctx)
 {
 	struct bpf_dynptr ptr;
 	struct sample *sample;
@@ -272,8 +272,44 @@ done:
 	return 0;
 }
 
+/* A data slice can't be used after it has been released.
+ *
+ * This tests the case where the data slice tracks a dynptr (ptr2)
+ * that is at a non-zero offset from the frame pointer (ptr1 is at fp,
+ * ptr2 is at fp - 16).
+ */
+SEC("?raw_tp")
+int data_slice_use_after_release2(void *ctx)
+{
+	struct bpf_dynptr ptr1, ptr2;
+	struct sample *sample;
+
+	bpf_ringbuf_reserve_dynptr(&ringbuf, 64, 0, &ptr1);
+	bpf_ringbuf_reserve_dynptr(&ringbuf, sizeof(*sample), 0, &ptr2);
+
+	sample = bpf_dynptr_data(&ptr2, 0, sizeof(*sample));
+	if (!sample)
+		goto done;
+
+	sample->pid = 23;
+
+	bpf_ringbuf_submit_dynptr(&ptr2, 0);
+
+	/* this should fail */
+	sample->pid = 23;
+
+	bpf_ringbuf_submit_dynptr(&ptr1, 0);
+
+	return 0;
+
+done:
+	bpf_ringbuf_discard_dynptr(&ptr2, 0);
+	bpf_ringbuf_discard_dynptr(&ptr1, 0);
+	return 0;
+}
+
 /* A data slice must be first checked for NULL */
-SEC("?raw_tp/sys_nanosleep")
+SEC("?raw_tp")
 int data_slice_missing_null_check1(void *ctx)
 {
 	struct bpf_dynptr ptr;
@@ -293,7 +329,7 @@ int data_slice_missing_null_check1(void *ctx)
 }
 
 /* A data slice can't be dereferenced if it wasn't checked for null */
-SEC("?raw_tp/sys_nanosleep")
+SEC("?raw_tp")
 int data_slice_missing_null_check2(void *ctx)
 {
 	struct bpf_dynptr ptr;
@@ -315,7 +351,7 @@ done:
 /* Can't pass in a dynptr as an arg to a helper function that doesn't take in a
  * dynptr argument
  */
-SEC("?raw_tp/sys_nanosleep")
+SEC("?raw_tp")
 int invalid_helper1(void *ctx)
 {
 	struct bpf_dynptr ptr;
@@ -329,7 +365,7 @@ int invalid_helper1(void *ctx)
 }
 
 /* A dynptr can't be passed into a helper function at a non-zero offset */
-SEC("?raw_tp/sys_nanosleep")
+SEC("?raw_tp")
 int invalid_helper2(void *ctx)
 {
 	struct bpf_dynptr ptr;
@@ -344,7 +380,7 @@ int invalid_helper2(void *ctx)
 }
 
 /* A bpf_dynptr is invalidated if it's been written into */
-SEC("?raw_tp/sys_nanosleep")
+SEC("?raw_tp")
 int invalid_write1(void *ctx)
 {
 	struct bpf_dynptr ptr;
@@ -365,7 +401,7 @@ int invalid_write1(void *ctx)
  * A bpf_dynptr can't be used as a dynptr if it has been written into at a fixed
  * offset
  */
-SEC("?raw_tp/sys_nanosleep")
+SEC("?raw_tp")
 int invalid_write2(void *ctx)
 {
 	struct bpf_dynptr ptr;
@@ -388,7 +424,7 @@ int invalid_write2(void *ctx)
  * A bpf_dynptr can't be used as a dynptr if it has been written into at a
  * non-const offset
  */
-SEC("?raw_tp/sys_nanosleep")
+SEC("?raw_tp")
 int invalid_write3(void *ctx)
 {
 	struct bpf_dynptr ptr;
@@ -419,7 +455,7 @@ static int invalid_write4_callback(__u32 index, void *data)
 /* If the dynptr is written into in a callback function, it should
  * be invalidated as a dynptr
  */
-SEC("?raw_tp/sys_nanosleep")
+SEC("?raw_tp")
 int invalid_write4(void *ctx)
 {
 	struct bpf_dynptr ptr;
@@ -436,7 +472,7 @@ int invalid_write4(void *ctx)
 
 /* A globally-defined bpf_dynptr can't be used (it must reside as a stack frame) */
 struct bpf_dynptr global_dynptr;
-SEC("?raw_tp/sys_nanosleep")
+SEC("?raw_tp")
 int global(void *ctx)
 {
 	/* this should fail */
@@ -448,7 +484,7 @@ int global(void *ctx)
 }
 
 /* A direct read should fail */
-SEC("?raw_tp/sys_nanosleep")
+SEC("?raw_tp")
 int invalid_read1(void *ctx)
 {
 	struct bpf_dynptr ptr;
@@ -464,7 +500,7 @@ int invalid_read1(void *ctx)
 }
 
 /* A direct read at an offset should fail */
-SEC("?raw_tp/sys_nanosleep")
+SEC("?raw_tp")
 int invalid_read2(void *ctx)
 {
 	struct bpf_dynptr ptr;
@@ -479,7 +515,7 @@ int invalid_read2(void *ctx)
 }
 
 /* A direct read at an offset into the lower stack slot should fail */
-SEC("?raw_tp/sys_nanosleep")
+SEC("?raw_tp")
 int invalid_read3(void *ctx)
 {
 	struct bpf_dynptr ptr1, ptr2;
@@ -505,7 +541,7 @@ static int invalid_read4_callback(__u32 index, void *data)
 }
 
 /* A direct read within a callback function should fail */
-SEC("?raw_tp/sys_nanosleep")
+SEC("?raw_tp")
 int invalid_read4(void *ctx)
 {
 	struct bpf_dynptr ptr;
@@ -520,7 +556,7 @@ int invalid_read4(void *ctx)
 }
 
 /* Initializing a dynptr on an offset should fail */
-SEC("?raw_tp/sys_nanosleep")
+SEC("?raw_tp")
 int invalid_offset(void *ctx)
 {
 	struct bpf_dynptr ptr;
@@ -534,7 +570,7 @@ int invalid_offset(void *ctx)
 }
 
 /* Can't release a dynptr twice */
-SEC("?raw_tp/sys_nanosleep")
+SEC("?raw_tp")
 int release_twice(void *ctx)
 {
 	struct bpf_dynptr ptr;
@@ -560,7 +596,7 @@ static int release_twice_callback_fn(__u32 index, void *data)
 /* Test that releasing a dynptr twice, where one of the releases happens
  * within a calback function, fails
  */
-SEC("?raw_tp/sys_nanosleep")
+SEC("?raw_tp")
 int release_twice_callback(void *ctx)
 {
 	struct bpf_dynptr ptr;
@@ -575,7 +611,7 @@ int release_twice_callback(void *ctx)
 }
 
 /* Reject unsupported local mem types for dynptr_from_mem API */
-SEC("?raw_tp/sys_nanosleep")
+SEC("?raw_tp")
 int dynptr_from_mem_invalid_api(void *ctx)
 {
 	struct bpf_dynptr ptr;