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

Alexei Starovoitov says:

====================
pull-request: bpf-next 2019-11-02

The following pull-request contains BPF updates for your *net-next* tree.

We've added 30 non-merge commits during the last 7 day(s) which contain
a total of 41 files changed, 1864 insertions(+), 474 deletions(-).

The main changes are:

1) Fix long standing user vs kernel access issue by introducing
   bpf_probe_read_user() and bpf_probe_read_kernel() helpers, from Daniel.

2) Accelerated xskmap lookup, from Björn and Maciej.

3) Support for automatic map pinning in libbpf, from Toke.

4) Cleanup of BTF-enabled raw tracepoints, from Alexei.

5) Various fixes to libbpf and selftests.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

tools/testing/selftests/bpf/Makefile

@@ -89,6 +89,9 @@ $(notdir $(TEST_GEN_PROGS)						\
 $(OUTPUT)/urandom_read: urandom_read.c
 	$(CC) -o $@ $< -Wl,--build-id
 
+$(OUTPUT)/test_stub.o: test_stub.c
+	$(CC) -c $(CFLAGS) -o $@ $<
+
 BPFOBJ := $(OUTPUT)/libbpf.a
 
 $(TEST_GEN_PROGS) $(TEST_GEN_PROGS_EXTENDED): $(OUTPUT)/test_stub.o $(BPFOBJ)
@@ -131,8 +134,13 @@ $(shell $(1) -v -E - </dev/null 2>&1 \
 	| sed -n '/<...> search starts here:/,/End of search list./{ s| \(/.*\)|-idirafter \1|p }')
 endef
 
+# Determine target endianness.
+IS_LITTLE_ENDIAN = $(shell $(CC) -dM -E - </dev/null | \
+			grep 'define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__')
+MENDIAN=$(if $(IS_LITTLE_ENDIAN),-mlittle-endian,-mbig-endian)
+
 CLANG_SYS_INCLUDES = $(call get_sys_includes,$(CLANG))
-BPF_CFLAGS = -g -D__TARGET_ARCH_$(SRCARCH) 				\
+BPF_CFLAGS = -g -D__TARGET_ARCH_$(SRCARCH) $(MENDIAN) 			\
 	     -I. -I./include/uapi -I$(APIDIR)				\
 	     -I$(BPFDIR) -I$(abspath $(OUTPUT)/../usr/include)
 
@@ -271,12 +279,8 @@ $(eval $(call DEFINE_TEST_RUNNER,test_progs,no_alu32))
 
 # Define test_progs BPF-GCC-flavored test runner.
 ifneq ($(BPF_GCC),)
-IS_LITTLE_ENDIAN = $(shell $(CC) -dM -E - </dev/null | \
-			grep 'define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__')
-MENDIAN=$(if $(IS_LITTLE_ENDIAN),-mlittle-endian,-mbig-endian)
-
 TRUNNER_BPF_BUILD_RULE := GCC_BPF_BUILD_RULE
-TRUNNER_BPF_CFLAGS := $(BPF_CFLAGS) $(call get_sys_includes,gcc) $(MENDIAN)
+TRUNNER_BPF_CFLAGS := $(BPF_CFLAGS) $(call get_sys_includes,gcc)
 TRUNNER_BPF_LDFLAGS :=
 $(eval $(call DEFINE_TEST_RUNNER,test_progs,bpf_gcc))
 endif

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

@@ -0,0 +1,210 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <test_progs.h>
+
+__u32 get_map_id(struct bpf_object *obj, const char *name)
+{
+	struct bpf_map_info map_info = {};
+	__u32 map_info_len, duration = 0;
+	struct bpf_map *map;
+	int err;
+
+	map_info_len = sizeof(map_info);
+
+	map = bpf_object__find_map_by_name(obj, name);
+	if (CHECK(!map, "find map", "NULL map"))
+		return 0;
+
+	err = bpf_obj_get_info_by_fd(bpf_map__fd(map),
+				     &map_info, &map_info_len);
+	CHECK(err, "get map info", "err %d errno %d", err, errno);
+	return map_info.id;
+}
+
+void test_pinning(void)
+{
+	const char *file_invalid = "./test_pinning_invalid.o";
+	const char *custpinpath = "/sys/fs/bpf/custom/pinmap";
+	const char *nopinpath = "/sys/fs/bpf/nopinmap";
+	const char *nopinpath2 = "/sys/fs/bpf/nopinmap2";
+	const char *custpath = "/sys/fs/bpf/custom";
+	const char *pinpath = "/sys/fs/bpf/pinmap";
+	const char *file = "./test_pinning.o";
+	__u32 map_id, map_id2, duration = 0;
+	struct stat statbuf = {};
+	struct bpf_object *obj;
+	struct bpf_map *map;
+	int err;
+	DECLARE_LIBBPF_OPTS(bpf_object_open_opts, opts,
+		.pin_root_path = custpath,
+	);
+
+	/* check that opening fails with invalid pinning value in map def */
+	obj = bpf_object__open_file(file_invalid, NULL);
+	err = libbpf_get_error(obj);
+	if (CHECK(err != -EINVAL, "invalid open", "err %d errno %d\n", err, errno)) {
+		obj = NULL;
+		goto out;
+	}
+
+	/* open the valid object file  */
+	obj = bpf_object__open_file(file, NULL);
+	err = libbpf_get_error(obj);
+	if (CHECK(err, "default open", "err %d errno %d\n", err, errno)) {
+		obj = NULL;
+		goto out;
+	}
+
+	err = bpf_object__load(obj);
+	if (CHECK(err, "default load", "err %d errno %d\n", err, errno))
+		goto out;
+
+	/* check that pinmap was pinned */
+	err = stat(pinpath, &statbuf);
+	if (CHECK(err, "stat pinpath", "err %d errno %d\n", err, errno))
+		goto out;
+
+	/* check that nopinmap was *not* pinned */
+	err = stat(nopinpath, &statbuf);
+	if (CHECK(!err || errno != ENOENT, "stat nopinpath",
+		  "err %d errno %d\n", err, errno))
+		goto out;
+
+	/* check that nopinmap2 was *not* pinned */
+	err = stat(nopinpath2, &statbuf);
+	if (CHECK(!err || errno != ENOENT, "stat nopinpath2",
+		  "err %d errno %d\n", err, errno))
+		goto out;
+
+	map_id = get_map_id(obj, "pinmap");
+	if (!map_id)
+		goto out;
+
+	bpf_object__close(obj);
+
+	obj = bpf_object__open_file(file, NULL);
+	if (CHECK_FAIL(libbpf_get_error(obj))) {
+		obj = NULL;
+		goto out;
+	}
+
+	err = bpf_object__load(obj);
+	if (CHECK(err, "default load", "err %d errno %d\n", err, errno))
+		goto out;
+
+	/* check that same map ID was reused for second load */
+	map_id2 = get_map_id(obj, "pinmap");
+	if (CHECK(map_id != map_id2, "check reuse",
+		  "err %d errno %d id %d id2 %d\n", err, errno, map_id, map_id2))
+		goto out;
+
+	/* should be no-op to re-pin same map */
+	map = bpf_object__find_map_by_name(obj, "pinmap");
+	if (CHECK(!map, "find map", "NULL map"))
+		goto out;
+
+	err = bpf_map__pin(map, NULL);
+	if (CHECK(err, "re-pin map", "err %d errno %d\n", err, errno))
+		goto out;
+
+	/* but error to pin at different location */
+	err = bpf_map__pin(map, "/sys/fs/bpf/other");
+	if (CHECK(!err, "pin map different", "err %d errno %d\n", err, errno))
+		goto out;
+
+	/* unpin maps with a pin_path set */
+	err = bpf_object__unpin_maps(obj, NULL);
+	if (CHECK(err, "unpin maps", "err %d errno %d\n", err, errno))
+		goto out;
+
+	/* and re-pin them... */
+	err = bpf_object__pin_maps(obj, NULL);
+	if (CHECK(err, "pin maps", "err %d errno %d\n", err, errno))
+		goto out;
+
+	/* set pinning path of other map and re-pin all */
+	map = bpf_object__find_map_by_name(obj, "nopinmap");
+	if (CHECK(!map, "find map", "NULL map"))
+		goto out;
+
+	err = bpf_map__set_pin_path(map, custpinpath);
+	if (CHECK(err, "set pin path", "err %d errno %d\n", err, errno))
+		goto out;
+
+	/* should only pin the one unpinned map */
+	err = bpf_object__pin_maps(obj, NULL);
+	if (CHECK(err, "pin maps", "err %d errno %d\n", err, errno))
+		goto out;
+
+	/* check that nopinmap was pinned at the custom path */
+	err = stat(custpinpath, &statbuf);
+	if (CHECK(err, "stat custpinpath", "err %d errno %d\n", err, errno))
+		goto out;
+
+	/* remove the custom pin path to re-test it with auto-pinning below */
+	err = unlink(custpinpath);
+	if (CHECK(err, "unlink custpinpath", "err %d errno %d\n", err, errno))
+		goto out;
+
+	err = rmdir(custpath);
+	if (CHECK(err, "rmdir custpindir", "err %d errno %d\n", err, errno))
+		goto out;
+
+	bpf_object__close(obj);
+
+	/* open the valid object file again */
+	obj = bpf_object__open_file(file, NULL);
+	err = libbpf_get_error(obj);
+	if (CHECK(err, "default open", "err %d errno %d\n", err, errno)) {
+		obj = NULL;
+		goto out;
+	}
+
+	/* swap pin paths of the two maps */
+	bpf_object__for_each_map(map, obj) {
+		if (!strcmp(bpf_map__name(map), "nopinmap"))
+			err = bpf_map__set_pin_path(map, pinpath);
+		else if (!strcmp(bpf_map__name(map), "pinmap"))
+			err = bpf_map__set_pin_path(map, NULL);
+		else
+			continue;
+
+		if (CHECK(err, "set pin path", "err %d errno %d\n", err, errno))
+			goto out;
+	}
+
+	/* should fail because of map parameter mismatch */
+	err = bpf_object__load(obj);
+	if (CHECK(err != -EINVAL, "param mismatch load", "err %d errno %d\n", err, errno))
+		goto out;
+
+	bpf_object__close(obj);
+
+	/* test auto-pinning at custom path with open opt */
+	obj = bpf_object__open_file(file, &opts);
+	if (CHECK_FAIL(libbpf_get_error(obj))) {
+		obj = NULL;
+		goto out;
+	}
+
+	err = bpf_object__load(obj);
+	if (CHECK(err, "custom load", "err %d errno %d\n", err, errno))
+		goto out;
+
+	/* check that pinmap was pinned at the custom path */
+	err = stat(custpinpath, &statbuf);
+	if (CHECK(err, "stat custpinpath", "err %d errno %d\n", err, errno))
+		goto out;
+
+out:
+	unlink(pinpath);
+	unlink(nopinpath);
+	unlink(nopinpath2);
+	unlink(custpinpath);
+	rmdir(custpath);
+	if (obj)
+		bpf_object__close(obj);
+}

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

@@ -0,0 +1,78 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <test_progs.h>
+
+void test_probe_user(void)
+{
+#define kprobe_name "__sys_connect"
+	const char *prog_name = "kprobe/" kprobe_name;
+	const char *obj_file = "./test_probe_user.o";
+	DECLARE_LIBBPF_OPTS(bpf_object_open_opts, opts, );
+	int err, results_map_fd, sock_fd, duration = 0;
+	struct sockaddr curr, orig, tmp;
+	struct sockaddr_in *in = (struct sockaddr_in *)&curr;
+	struct bpf_link *kprobe_link = NULL;
+	struct bpf_program *kprobe_prog;
+	struct bpf_object *obj;
+	static const int zero = 0;
+
+	obj = bpf_object__open_file(obj_file, &opts);
+	if (CHECK(IS_ERR(obj), "obj_open_file", "err %ld\n", PTR_ERR(obj)))
+		return;
+
+	kprobe_prog = bpf_object__find_program_by_title(obj, prog_name);
+	if (CHECK(!kprobe_prog, "find_probe",
+		  "prog '%s' not found\n", prog_name))
+		goto cleanup;
+
+	err = bpf_object__load(obj);
+	if (CHECK(err, "obj_load", "err %d\n", err))
+		goto cleanup;
+
+	results_map_fd = bpf_find_map(__func__, obj, "test_pro.bss");
+	if (CHECK(results_map_fd < 0, "find_bss_map",
+		  "err %d\n", results_map_fd))
+		goto cleanup;
+
+	kprobe_link = bpf_program__attach_kprobe(kprobe_prog, false,
+						 kprobe_name);
+	if (CHECK(IS_ERR(kprobe_link), "attach_kprobe",
+		  "err %ld\n", PTR_ERR(kprobe_link))) {
+		kprobe_link = NULL;
+		goto cleanup;
+	}
+
+	memset(&curr, 0, sizeof(curr));
+	in->sin_family = AF_INET;
+	in->sin_port = htons(5555);
+	in->sin_addr.s_addr = inet_addr("255.255.255.255");
+	memcpy(&orig, &curr, sizeof(curr));
+
+	sock_fd = socket(AF_INET, SOCK_STREAM, 0);
+	if (CHECK(sock_fd < 0, "create_sock_fd", "err %d\n", sock_fd))
+		goto cleanup;
+
+	connect(sock_fd, &curr, sizeof(curr));
+	close(sock_fd);
+
+	err = bpf_map_lookup_elem(results_map_fd, &zero, &tmp);
+	if (CHECK(err, "get_kprobe_res",
+		  "failed to get kprobe res: %d\n", err))
+		goto cleanup;
+
+	in = (struct sockaddr_in *)&tmp;
+	if (CHECK(memcmp(&tmp, &orig, sizeof(orig)), "check_kprobe_res",
+		  "wrong kprobe res from probe read: %s:%u\n",
+		  inet_ntoa(in->sin_addr), ntohs(in->sin_port)))
+		goto cleanup;
+
+	memset(&tmp, 0xab, sizeof(tmp));
+
+	in = (struct sockaddr_in *)&curr;
+	if (CHECK(memcmp(&curr, &tmp, sizeof(tmp)), "check_kprobe_res",
+		  "wrong kprobe res from probe write: %s:%u\n",
+		  inet_ntoa(in->sin_addr), ntohs(in->sin_port)))
+		goto cleanup;
+cleanup:
+	bpf_link__destroy(kprobe_link);
+	bpf_object__close(obj);
+}

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

@@ -79,11 +79,11 @@ int trace_kfree_skb(struct trace_kfree_skb *ctx)
 		func = ptr->func;
 	}));
 
-	bpf_probe_read(&pkt_type, sizeof(pkt_type), _(&skb->__pkt_type_offset));
+	bpf_probe_read_kernel(&pkt_type, sizeof(pkt_type), _(&skb->__pkt_type_offset));
 	pkt_type &= 7;
 
 	/* read eth proto */
-	bpf_probe_read(&pkt_data, sizeof(pkt_data), data + 12);
+	bpf_probe_read_kernel(&pkt_data, sizeof(pkt_data), data + 12);
 
 	bpf_printk("rcuhead.next %llx func %llx\n", ptr, func);
 	bpf_printk("skb->len %d users %d pkt_type %x\n",

tools/testing/selftests/bpf/progs/pyperf.h

@@ -72,9 +72,9 @@ static __always_inline void *get_thread_state(void *tls_base, PidData *pidData)
 	void* thread_state;
 	int key;
 
-	bpf_probe_read(&key, sizeof(key), (void*)(long)pidData->tls_key_addr);
-	bpf_probe_read(&thread_state, sizeof(thread_state),
-		       tls_base + 0x310 + key * 0x10 + 0x08);
+	bpf_probe_read_user(&key, sizeof(key), (void*)(long)pidData->tls_key_addr);
+	bpf_probe_read_user(&thread_state, sizeof(thread_state),
+			    tls_base + 0x310 + key * 0x10 + 0x08);
 	return thread_state;
 }
 
@@ -82,31 +82,33 @@ static __always_inline bool get_frame_data(void *frame_ptr, PidData *pidData,
 					   FrameData *frame, Symbol *symbol)
 {
 	// read data from PyFrameObject
-	bpf_probe_read(&frame->f_back,
-		       sizeof(frame->f_back),
-		       frame_ptr + pidData->offsets.PyFrameObject_back);
-	bpf_probe_read(&frame->f_code,
-		       sizeof(frame->f_code),
-		       frame_ptr + pidData->offsets.PyFrameObject_code);
+	bpf_probe_read_user(&frame->f_back,
+			    sizeof(frame->f_back),
+			    frame_ptr + pidData->offsets.PyFrameObject_back);
+	bpf_probe_read_user(&frame->f_code,
+			    sizeof(frame->f_code),
+			    frame_ptr + pidData->offsets.PyFrameObject_code);
 
 	// read data from PyCodeObject
 	if (!frame->f_code)
 		return false;
-	bpf_probe_read(&frame->co_filename,
-		       sizeof(frame->co_filename),
-		       frame->f_code + pidData->offsets.PyCodeObject_filename);
-	bpf_probe_read(&frame->co_name,
-		       sizeof(frame->co_name),
-		       frame->f_code + pidData->offsets.PyCodeObject_name);
+	bpf_probe_read_user(&frame->co_filename,
+			    sizeof(frame->co_filename),
+			    frame->f_code + pidData->offsets.PyCodeObject_filename);
+	bpf_probe_read_user(&frame->co_name,
+			    sizeof(frame->co_name),
+			    frame->f_code + pidData->offsets.PyCodeObject_name);
 	// read actual names into symbol
 	if (frame->co_filename)
-		bpf_probe_read_str(&symbol->file,
-				   sizeof(symbol->file),
-				   frame->co_filename + pidData->offsets.String_data);
+		bpf_probe_read_user_str(&symbol->file,
+					sizeof(symbol->file),
+					frame->co_filename +
+					pidData->offsets.String_data);
 	if (frame->co_name)
-		bpf_probe_read_str(&symbol->name,
-				   sizeof(symbol->name),
-				   frame->co_name + pidData->offsets.String_data);
+		bpf_probe_read_user_str(&symbol->name,
+					sizeof(symbol->name),
+					frame->co_name +
+					pidData->offsets.String_data);
 	return true;
 }
 
@@ -174,9 +176,9 @@ static __always_inline int __on_event(struct pt_regs *ctx)
 	event->kernel_stack_id = bpf_get_stackid(ctx, &stackmap, 0);
 
 	void* thread_state_current = (void*)0;
-	bpf_probe_read(&thread_state_current,
-		       sizeof(thread_state_current),
-		       (void*)(long)pidData->current_state_addr);
+	bpf_probe_read_user(&thread_state_current,
+			    sizeof(thread_state_current),
+			    (void*)(long)pidData->current_state_addr);
 
 	struct task_struct* task = (struct task_struct*)bpf_get_current_task();
 	void* tls_base = (void*)task;
@@ -188,11 +190,13 @@ static __always_inline int __on_event(struct pt_regs *ctx)
 	if (pidData->use_tls) {
 		uint64_t pthread_created;
 		uint64_t pthread_self;
-		bpf_probe_read(&pthread_self, sizeof(pthread_self), tls_base + 0x10);
+		bpf_probe_read_user(&pthread_self, sizeof(pthread_self),
+				    tls_base + 0x10);
 
-		bpf_probe_read(&pthread_created,
-			       sizeof(pthread_created),
-			       thread_state + pidData->offsets.PyThreadState_thread);
+		bpf_probe_read_user(&pthread_created,
+				    sizeof(pthread_created),
+				    thread_state +
+				    pidData->offsets.PyThreadState_thread);
 		event->pthread_match = pthread_created == pthread_self;
 	} else {
 		event->pthread_match = 1;
@@ -204,9 +208,10 @@ static __always_inline int __on_event(struct pt_regs *ctx)
 		Symbol sym = {};
 		int cur_cpu = bpf_get_smp_processor_id();
 
-		bpf_probe_read(&frame_ptr,
-			       sizeof(frame_ptr),
-			       thread_state + pidData->offsets.PyThreadState_frame);
+		bpf_probe_read_user(&frame_ptr,
+				    sizeof(frame_ptr),
+				    thread_state +
+				    pidData->offsets.PyThreadState_frame);
 
 		int32_t* symbol_counter = bpf_map_lookup_elem(&symbolmap, &sym);
 		if (symbol_counter == NULL)

tools/testing/selftests/bpf/progs/strobemeta.h

@@ -98,7 +98,7 @@ struct strobe_map_raw {
 	/*
 	 * having volatile doesn't change anything on BPF side, but clang
 	 * emits warnings for passing `volatile const char *` into
-	 * bpf_probe_read_str that expects just `const char *`
+	 * bpf_probe_read_user_str that expects just `const char *`
 	 */
 	const char* tag;
 	/*
@@ -309,18 +309,18 @@ static __always_inline void *calc_location(struct strobe_value_loc *loc,
 	dtv_t *dtv;
 	void *tls_ptr;
 
-	bpf_probe_read(&tls_index, sizeof(struct tls_index),
-		       (void *)loc->offset);
+	bpf_probe_read_user(&tls_index, sizeof(struct tls_index),
+			    (void *)loc->offset);
 	/* valid module index is always positive */
 	if (tls_index.module > 0) {
 		/* dtv = ((struct tcbhead *)tls_base)->dtv[tls_index.module] */
-		bpf_probe_read(&dtv, sizeof(dtv),
-			       &((struct tcbhead *)tls_base)->dtv);
+		bpf_probe_read_user(&dtv, sizeof(dtv),
+				    &((struct tcbhead *)tls_base)->dtv);
 		dtv += tls_index.module;
 	} else {
 		dtv = NULL;
 	}
-	bpf_probe_read(&tls_ptr, sizeof(void *), dtv);
+	bpf_probe_read_user(&tls_ptr, sizeof(void *), dtv);
 	/* if pointer has (void *)-1 value, then TLS wasn't initialized yet */
 	return tls_ptr && tls_ptr != (void *)-1
 		? tls_ptr + tls_index.offset
@@ -336,7 +336,7 @@ static __always_inline void read_int_var(struct strobemeta_cfg *cfg,
 	if (!location)
 		return;
 
-	bpf_probe_read(value, sizeof(struct strobe_value_generic), location);
+	bpf_probe_read_user(value, sizeof(struct strobe_value_generic), location);
 	data->int_vals[idx] = value->val;
 	if (value->header.len)
 		data->int_vals_set_mask |= (1 << idx);
@@ -356,13 +356,13 @@ static __always_inline uint64_t read_str_var(struct strobemeta_cfg *cfg,
 	if (!location)
 		return 0;
 
-	bpf_probe_read(value, sizeof(struct strobe_value_generic), location);
-	len = bpf_probe_read_str(payload, STROBE_MAX_STR_LEN, value->ptr);
+	bpf_probe_read_user(value, sizeof(struct strobe_value_generic), location);
+	len = bpf_probe_read_user_str(payload, STROBE_MAX_STR_LEN, value->ptr);
 	/*
-	 * if bpf_probe_read_str returns error (<0), due to casting to
+	 * if bpf_probe_read_user_str returns error (<0), due to casting to
 	 * unsinged int, it will become big number, so next check is
 	 * sufficient to check for errors AND prove to BPF verifier, that
-	 * bpf_probe_read_str won't return anything bigger than
+	 * bpf_probe_read_user_str won't return anything bigger than
 	 * STROBE_MAX_STR_LEN
 	 */
 	if (len > STROBE_MAX_STR_LEN)
@@ -391,8 +391,8 @@ static __always_inline void *read_map_var(struct strobemeta_cfg *cfg,
 	if (!location)
 		return payload;
 
-	bpf_probe_read(value, sizeof(struct strobe_value_generic), location);
-	if (bpf_probe_read(&map, sizeof(struct strobe_map_raw), value->ptr))
+	bpf_probe_read_user(value, sizeof(struct strobe_value_generic), location);
+	if (bpf_probe_read_user(&map, sizeof(struct strobe_map_raw), value->ptr))
 		return payload;
 
 	descr->id = map.id;
@@ -402,7 +402,7 @@ static __always_inline void *read_map_var(struct strobemeta_cfg *cfg,
 		data->req_meta_valid = 1;
 	}
 
-	len = bpf_probe_read_str(payload, STROBE_MAX_STR_LEN, map.tag);
+	len = bpf_probe_read_user_str(payload, STROBE_MAX_STR_LEN, map.tag);
 	if (len <= STROBE_MAX_STR_LEN) {
 		descr->tag_len = len;
 		payload += len;
@@ -418,15 +418,15 @@ static __always_inline void *read_map_var(struct strobemeta_cfg *cfg,
 			break;
 
 		descr->key_lens[i] = 0;
-		len = bpf_probe_read_str(payload, STROBE_MAX_STR_LEN,
-					 map.entries[i].key);
+		len = bpf_probe_read_user_str(payload, STROBE_MAX_STR_LEN,
+					      map.entries[i].key);
 		if (len <= STROBE_MAX_STR_LEN) {
 			descr->key_lens[i] = len;
 			payload += len;
 		}
 		descr->val_lens[i] = 0;
-		len = bpf_probe_read_str(payload, STROBE_MAX_STR_LEN,
-					 map.entries[i].val);
+		len = bpf_probe_read_user_str(payload, STROBE_MAX_STR_LEN,
+					      map.entries[i].val);
 		if (len <= STROBE_MAX_STR_LEN) {
 			descr->val_lens[i] = len;
 			payload += len;

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

@@ -0,0 +1,31 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/bpf.h>
+#include "bpf_helpers.h"
+
+int _version SEC("version") = 1;
+
+struct {
+	__uint(type, BPF_MAP_TYPE_ARRAY);
+	__uint(max_entries, 1);
+	__type(key, __u32);
+	__type(value, __u64);
+	__uint(pinning, LIBBPF_PIN_BY_NAME);
+} pinmap SEC(".maps");
+
+struct {
+	__uint(type, BPF_MAP_TYPE_HASH);
+	__uint(max_entries, 1);
+	__type(key, __u32);
+	__type(value, __u64);
+} nopinmap SEC(".maps");
+
+struct {
+	__uint(type, BPF_MAP_TYPE_ARRAY);
+	__uint(max_entries, 1);
+	__type(key, __u32);
+	__type(value, __u64);
+	__uint(pinning, LIBBPF_PIN_NONE);
+} nopinmap2 SEC(".maps");
+
+char _license[] SEC("license") = "GPL";

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

@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/bpf.h>
+#include "bpf_helpers.h"
+
+int _version SEC("version") = 1;
+
+struct {
+	__uint(type, BPF_MAP_TYPE_ARRAY);
+	__uint(max_entries, 1);
+	__type(key, __u32);
+	__type(value, __u64);
+	__uint(pinning, 2); /* invalid */
+} nopinmap3 SEC(".maps");
+
+char _license[] SEC("license") = "GPL";

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

@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/ptrace.h>
+#include <linux/bpf.h>
+
+#include <netinet/in.h>
+
+#include "bpf_helpers.h"
+#include "bpf_tracing.h"
+
+static struct sockaddr_in old;
+
+SEC("kprobe/__sys_connect")
+int handle_sys_connect(struct pt_regs *ctx)
+{
+	void *ptr = (void *)PT_REGS_PARM2(ctx);
+	struct sockaddr_in new;
+
+	bpf_probe_read_user(&old, sizeof(old), ptr);
+	__builtin_memset(&new, 0xab, sizeof(new));
+	bpf_probe_write_user(ptr, &new, sizeof(new));
+
+	return 0;
+}
+
+char _license[] SEC("license") = "GPL";

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

@@ -38,7 +38,7 @@
 #include <sys/socket.h>
 #include "bpf_helpers.h"
 
-#define _(P) ({typeof(P) val = 0; bpf_probe_read(&val, sizeof(val), &P); val;})
+#define _(P) ({typeof(P) val = 0; bpf_probe_read_kernel(&val, sizeof(val), &P); val;})
 #define TCP_ESTATS_MAGIC 0xBAADBEEF
 
 /* This test case needs "sock" and "pt_regs" data structure.

tools/testing/selftests/bpf/test_offload.py

@@ -314,9 +314,6 @@ class DebugfsDir:
                 continue
 
             p = os.path.join(path, f)
-            if not os.stat(p).st_mode & stat.S_IRUSR:
-                continue
-
             if os.path.isfile(p) and os.access(p, os.R_OK):
                 _, out = cmd('cat %s/%s' % (path, f))
                 dfs[f] = out.strip()

tools/testing/selftests/bpf/test_sysctl.c

@@ -120,6 +120,29 @@ static struct sysctl_test tests[] = {
 		.newval = "(none)", /* same as default, should fail anyway */
 		.result = OP_EPERM,
 	},
+	{
+		.descr = "ctx:write sysctl:write read ok narrow",
+		.insns = {
+			/* u64 w = (u16)write & 1; */
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+			BPF_LDX_MEM(BPF_H, BPF_REG_7, BPF_REG_1,
+				    offsetof(struct bpf_sysctl, write)),
+#else
+			BPF_LDX_MEM(BPF_H, BPF_REG_7, BPF_REG_1,
+				    offsetof(struct bpf_sysctl, write) + 2),
+#endif
+			BPF_ALU64_IMM(BPF_AND, BPF_REG_7, 1),
+			/* return 1 - w; */
+			BPF_MOV64_IMM(BPF_REG_0, 1),
+			BPF_ALU64_REG(BPF_SUB, BPF_REG_0, BPF_REG_7),
+			BPF_EXIT_INSN(),
+		},
+		.attach_type = BPF_CGROUP_SYSCTL,
+		.sysctl = "kernel/domainname",
+		.open_flags = O_WRONLY,
+		.newval = "(none)", /* same as default, should fail anyway */
+		.result = OP_EPERM,
+	},
 	{
 		.descr = "ctx:write sysctl:read write reject",
 		.insns = {