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

Daniel Borkmann says:

====================
pull-request: bpf 2018-06-08

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

The main changes are:

1) Fix in the BPF verifier to reject modified ctx pointers on helper
   functions, from Daniel.

2) Fix in BPF kselftests for get_cgroup_id_user() helper to only
   record the cgroup id for a provided pid in order to reduce test
   failures from processes interferring with the test, from Yonghong.

3) Fix a crash in AF_XDP's mem accounting when the process owning
   the sock has CAP_IPC_LOCK capabilities set, from Daniel.

4) Fix an issue for AF_XDP on 32 bit machines where XDP_UMEM_PGOFF_*_RING
   defines need ULL suffixes and use loff_t type as they are otherwise
   truncated, from Geert.
====================

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

3 files changed, 80 insertions, 4 deletions

diff --git a/tools/testing/selftests/bpf/get_cgroup_id_kern.c b/tools/testing/selftests/bpf/get_cgroup_id_kern.c
index 2cf8cb2..014dba1 100644
--- a/tools/testing/selftests/bpf/get_cgroup_id_kern.c
+++ b/tools/testing/selftests/bpf/get_cgroup_id_kern.c
@@ -11,12 +11,24 @@ struct bpf_map_def SEC("maps") cg_ids = {
 	.max_entries = 1,
 };
 
+struct bpf_map_def SEC("maps") pidmap = {
+	.type = BPF_MAP_TYPE_ARRAY,
+	.key_size = sizeof(__u32),
+	.value_size = sizeof(__u32),
+	.max_entries = 1,
+};
+
 SEC("tracepoint/syscalls/sys_enter_nanosleep")
 int trace(void *ctx)
 {
-	__u32 key = 0;
+	__u32 pid = bpf_get_current_pid_tgid();
+	__u32 key = 0, *expected_pid;
 	__u64 *val;
 
+	expected_pid = bpf_map_lookup_elem(&pidmap, &key);
+	if (!expected_pid || *expected_pid != pid)
+		return 0;
+
 	val = bpf_map_lookup_elem(&cg_ids, &key);
 	if (val)
 		*val = bpf_get_current_cgroup_id();
diff --git a/tools/testing/selftests/bpf/get_cgroup_id_user.c b/tools/testing/selftests/bpf/get_cgroup_id_user.c
index ea19a42..e8da7b3 100644
--- a/tools/testing/selftests/bpf/get_cgroup_id_user.c
+++ b/tools/testing/selftests/bpf/get_cgroup_id_user.c
@@ -50,13 +50,13 @@ int main(int argc, char **argv)
 	const char *probe_name = "syscalls/sys_enter_nanosleep";
 	const char *file = "get_cgroup_id_kern.o";
 	int err, bytes, efd, prog_fd, pmu_fd;
+	int cgroup_fd, cgidmap_fd, pidmap_fd;
 	struct perf_event_attr attr = {};
-	int cgroup_fd, cgidmap_fd;
 	struct bpf_object *obj;
 	__u64 kcgid = 0, ucgid;
+	__u32 key = 0, pid;
 	int exit_code = 1;
 	char buf[256];
-	__u32 key = 0;
 
 	err = setup_cgroup_environment();
 	if (CHECK(err, "setup_cgroup_environment", "err %d errno %d\n", err,
@@ -81,6 +81,14 @@ int main(int argc, char **argv)
 		  cgidmap_fd, errno))
 		goto close_prog;
 
+	pidmap_fd = bpf_find_map(__func__, obj, "pidmap");
+	if (CHECK(pidmap_fd < 0, "bpf_find_map", "err %d errno %d\n",
+		  pidmap_fd, errno))
+		goto close_prog;
+
+	pid = getpid();
+	bpf_map_update_elem(pidmap_fd, &key, &pid, 0);
+
 	snprintf(buf, sizeof(buf),
 		 "/sys/kernel/debug/tracing/events/%s/id", probe_name);
 	efd = open(buf, O_RDONLY, 0);
diff --git a/tools/testing/selftests/bpf/test_verifier.c b/tools/testing/selftests/bpf/test_verifier.c
index 7cb1d74..2ecd27b 100644
--- a/tools/testing/selftests/bpf/test_verifier.c
+++ b/tools/testing/selftests/bpf/test_verifier.c
@@ -8647,7 +8647,7 @@ static struct bpf_test tests[] = {
 				    offsetof(struct __sk_buff, mark)),
 			BPF_EXIT_INSN(),
 		},
-		.errstr = "dereference of modified ctx ptr R1 off=68+8, ctx+const is allowed, ctx+const+const is not",
+		.errstr = "dereference of modified ctx ptr",
 		.result = REJECT,
 		.prog_type = BPF_PROG_TYPE_SCHED_CLS,
 	},
@@ -12258,6 +12258,62 @@ static struct bpf_test tests[] = {
 		.result = ACCEPT,
 		.retval = 5,
 	},
+	{
+		"pass unmodified ctx pointer to helper",
+		.insns = {
+			BPF_MOV64_IMM(BPF_REG_2, 0),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
+				     BPF_FUNC_csum_update),
+			BPF_MOV64_IMM(BPF_REG_0, 0),
+			BPF_EXIT_INSN(),
+		},
+		.prog_type = BPF_PROG_TYPE_SCHED_CLS,
+		.result = ACCEPT,
+	},
+	{
+		"pass modified ctx pointer to helper, 1",
+		.insns = {
+			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -612),
+			BPF_MOV64_IMM(BPF_REG_2, 0),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
+				     BPF_FUNC_csum_update),
+			BPF_MOV64_IMM(BPF_REG_0, 0),
+			BPF_EXIT_INSN(),
+		},
+		.prog_type = BPF_PROG_TYPE_SCHED_CLS,
+		.result = REJECT,
+		.errstr = "dereference of modified ctx ptr",
+	},
+	{
+		"pass modified ctx pointer to helper, 2",
+		.insns = {
+			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -612),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
+				     BPF_FUNC_get_socket_cookie),
+			BPF_MOV64_IMM(BPF_REG_0, 0),
+			BPF_EXIT_INSN(),
+		},
+		.result_unpriv = REJECT,
+		.result = REJECT,
+		.errstr_unpriv = "dereference of modified ctx ptr",
+		.errstr = "dereference of modified ctx ptr",
+	},
+	{
+		"pass modified ctx pointer to helper, 3",
+		.insns = {
+			BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1, 0),
+			BPF_ALU64_IMM(BPF_AND, BPF_REG_3, 4),
+			BPF_ALU64_REG(BPF_ADD, BPF_REG_1, BPF_REG_3),
+			BPF_MOV64_IMM(BPF_REG_2, 0),
+			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
+				     BPF_FUNC_csum_update),
+			BPF_MOV64_IMM(BPF_REG_0, 0),
+			BPF_EXIT_INSN(),
+		},
+		.prog_type = BPF_PROG_TYPE_SCHED_CLS,
+		.result = REJECT,
+		.errstr = "variable ctx access var_off=(0x0; 0x4)",
+	},
 };
 
 static int probe_filter_length(const struct bpf_insn *fp)