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bpf: support decreasing order in direct packet access 

when packet headers are accessed in 'decreasing' order (like TCP port
may be fetched before the program reads IP src) the llvm may generate
the following code:
[...]                // R7=pkt(id=0,off=22,r=70)
r2 = *(u32 *)(r7 +0) // good access
[...]
r7 += 40             // R7=pkt(id=0,off=62,r=70)
r8 = *(u32 *)(r7 +0) // good access
[...]
r1 = *(u32 *)(r7 -20) // this one will fail though it's within a safe range
                      // it's doing *(u32*)(skb->data + 42)
Fix verifier to recognize such code pattern

Alos turned out that 'off > range' condition is not a verifier bug.
It's a buggy program that may do something like:
if (ptr + 50 > data_end)
  return 0;
ptr += 60;
*(u32*)ptr;
in such case emit
"invalid access to packet, off=0 size=4, R1(id=0,off=60,r=50)" error message,
so all information is available for the program author to fix the program.

Fixes: 969bf05eb3 ("bpf: direct packet access")
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexei Starovoitov 2016-05-19 18:17:13 -07:00 committed by David S. Miller
parent 238a9584e9
commit d91b28ed42
1 changed files with 4 additions and 8 deletions
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12
kernel/bpf/verifier.c
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@ -683,15 +683,11 @@ static int check_packet_access(struct verifier_env *env, u32 regno, int off,
{
struct reg_state *regs = env->cur_state.regs;
struct reg_state *reg = &regs[regno];
int linear_size = (int) reg->range - (int) reg->off;
if (linear_size < 0 || linear_size >= MAX_PACKET_OFF) {
verbose("verifier bug\n");
return -EFAULT;
}
if (off < 0 || off + size > linear_size) {
verbose("invalid access to packet, off=%d size=%d, allowed=%d\n",
off, size, linear_size);
off += reg->off;
if (off < 0 || off + size > reg->range) {
verbose("invalid access to packet, off=%d size=%d, R%d(id=%d,off=%d,r=%d)\n",
off, size, regno, reg->id, reg->off, reg->range);
return -EACCES;
}
return 0;