bpf: fix two bugs in verification logic when accessing 'ctx' pointer

1.
first bug is a silly mistake. It broke tracing examples and prevented
simple bpf programs from loading.

In the following code:
if (insn->imm == 0 && BPF_SIZE(insn->code) == BPF_W) {
} else if (...) {
  // this part should have been executed when
  // insn->code == BPF_W and insn->imm != 0
}

Obviously it's not doing that. So simple instructions like:
r2 = *(u64 *)(r1 + 8)
will be rejected. Note the comments in the code around these branches
were and still valid and indicate the true intent.

Replace it with:
if (BPF_SIZE(insn->code) != BPF_W)
  continue;

if (insn->imm == 0) {
} else if (...) {
  // now this code will be executed when
  // insn->code == BPF_W and insn->imm != 0
}

2.
second bug is more subtle.
If malicious code is using the same dest register as source register,
the checks designed to prevent the same instruction to be used with different
pointer types will fail to trigger, since we were assigning src_reg_type
when it was already overwritten by check_mem_access().
The fix is trivial. Just move line:
src_reg_type = regs[insn->src_reg].type;
before check_mem_access().
Add new 'access skb fields bad4' test to check this case.

Fixes: 9bac3d6d548e ("bpf: allow extended BPF programs access skb fields")
Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 2 deletions

diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 66bec36ec1ec..47dcd3aa6e23 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -1637,6 +1637,8 @@ static int do_check(struct verifier_env *env)
                         if (err)
                                 return err;
 
+                        src_reg_type = regs[insn->src_reg].type;
+
                         /* check that memory (src_reg + off) is readable,
                          * the state of dst_reg will be updated by this func
                          */
@@ -1646,9 +1648,12 @@ static int do_check(struct verifier_env *env)
                         if (err)
                                 return err;
 
-                        src_reg_type = regs[insn->src_reg].type;
+                        if (BPF_SIZE(insn->code) != BPF_W) {
+                                insn_idx++;
+                                continue;
+                        }
 
-                        if (insn->imm == 0 && BPF_SIZE(insn->code) == BPF_W) {
+                        if (insn->imm == 0) {
                                 /* saw a valid insn
                                  * dst_reg = *(u32 *)(src_reg + off)
                                  * use reserved 'imm' field to mark this insn