Hi all,

Today's linux-next merge of the net-next tree got a conflict in:

  tools/testing/selftests/bpf/test_verifier.c

between commit:

  7640ead93924 ("bpf: verifier: make sure callees don't prune with caller differences")

from the bpf tree and commit:

  e3da08d05700 ("bpf: allow BPF read access to qdisc pkt_len")

from the net-next tree.

I fixed it up (see below) and can carry the fix as necessary. This
is now fixed as far as linux-next is concerned, but any non trivial
conflicts should be mentioned to your upstream maintainer when your tree
is submitted for merging.  You may also want to consider cooperating
with the maintainer of the conflicting tree to minimise any particularly
complex conflicts.

-- 
Cheers,
Stephen Rothwell

diff --cc tools/testing/selftests/bpf/test_verifier.c
index f8eac4a544f4,a08c67c8767e..000000000000
--- a/tools/testing/selftests/bpf/test_verifier.c
+++ b/tools/testing/selftests/bpf/test_verifier.c
@@@ -13915,34 -14067,38 +14067,66 @@@ static struct bpf_test tests[] = 
  		.result_unpriv = REJECT,
  		.result = ACCEPT,
  	},
 +	{
 +		"calls: cross frame pruning",
 +		.insns = {
 +			/* r8 = !!random();
 +			 * call pruner()
 +			 * if (r8)
 +			 *     do something bad;
 +			 */
 +			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
 +				     BPF_FUNC_get_prandom_u32),
 +			BPF_MOV64_IMM(BPF_REG_8, 0),
 +			BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
 +			BPF_MOV64_IMM(BPF_REG_8, 1),
 +			BPF_MOV64_REG(BPF_REG_1, BPF_REG_8),
 +			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 1, 0, 4),
 +			BPF_JMP_IMM(BPF_JEQ, BPF_REG_8, 1, 1),
 +			BPF_LDX_MEM(BPF_B, BPF_REG_9, BPF_REG_1, 0),
 +			BPF_MOV64_IMM(BPF_REG_0, 0),
 +			BPF_EXIT_INSN(),
 +			BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 0, 0),
 +			BPF_EXIT_INSN(),
 +		},
 +		.prog_type = BPF_PROG_TYPE_SOCKET_FILTER,
 +		.errstr_unpriv = "function calls to other bpf functions are allowed for root only",
 +		.result_unpriv = REJECT,
 +		.errstr = "!read_ok",
 +		.result = REJECT,
 +	},
+ 	{
+ 		"check wire_len is not readable by sockets",
+ 		.insns = {
+ 			BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1,
+ 				    offsetof(struct __sk_buff, wire_len)),
+ 			BPF_EXIT_INSN(),
+ 		},
+ 		.errstr = "invalid bpf_context access",
+ 		.result = REJECT,
+ 	},
+ 	{
+ 		"check wire_len is readable by tc classifier",
+ 		.insns = {
+ 			BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1,
+ 				    offsetof(struct __sk_buff, wire_len)),
+ 			BPF_EXIT_INSN(),
+ 		},
+ 		.prog_type = BPF_PROG_TYPE_SCHED_CLS,
+ 		.result = ACCEPT,
+ 	},
+ 	{
+ 		"check wire_len is not writable by tc classifier",
+ 		.insns = {
+ 			BPF_STX_MEM(BPF_W, BPF_REG_1, BPF_REG_1,
+ 				    offsetof(struct __sk_buff, wire_len)),
+ 			BPF_EXIT_INSN(),
+ 		},
+ 		.prog_type = BPF_PROG_TYPE_SCHED_CLS,
+ 		.errstr = "invalid bpf_context access",
+ 		.errstr_unpriv = "R1 leaks addr",
+ 		.result = REJECT,
+ 	},
  };
  
  static int probe_filter_length(const struct bpf_insn *fp)