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bpf: sk_msg, improve offset chk in _is_valid_access 

The check for max offset in sk_msg_is_valid_access uses sizeof()
which is incorrect because it would allow accessing possibly
past the end of the struct in the padded case. Further, it doesn't
preclude accessing any padding that may be added in the middle of
a struct. All told this makes it fragile to rely on.

To fix this explicitly check offsets with fields using the
bpf_ctx_range() and bpf_ctx_range_till() macros.

For reference the current structure layout looks as follows (reported
by pahole)

struct sk_msg_md {
	union {
		void *             data;                 /*           8 */
	};                                               /*     0     8 */
	union {
		void *             data_end;             /*           8 */
	};                                               /*     8     8 */
	__u32                      family;               /*    16     4 */
	__u32                      remote_ip4;           /*    20     4 */
	__u32                      local_ip4;            /*    24     4 */
	__u32                      remote_ip6[4];        /*    28    16 */
	__u32                      local_ip6[4];         /*    44    16 */
	__u32                      remote_port;          /*    60     4 */
	/* --- cacheline 1 boundary (64 bytes) --- */
	__u32                      local_port;           /*    64     4 */
	__u32                      size;                 /*    68     4 */

	/* size: 72, cachelines: 2, members: 10 */
	/* last cacheline: 8 bytes */
};

So there should be no padding at the moment but fixing this now
prevents future errors.

Reported-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
John Fastabend 2018-12-20 11:35:30 -08:00 committed by Daniel Borkmann
parent 9ee79a65d1
commit bc1b4f013b
1 changed files with 14 additions and 7 deletions
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21
net/core/filter.c
View File

@ -6313,6 +6313,9 @@ static bool sk_msg_is_valid_access(int off, int size,
if (type == BPF_WRITE)
return false;
if (off % size != 0)
return false;
switch (off) {
case offsetof(struct sk_msg_md, data):
info->reg_type = PTR_TO_PACKET;
@ -6324,16 +6327,20 @@ static bool sk_msg_is_valid_access(int off, int size,
if (size != sizeof(__u64))
return false;
break;
default:
case bpf_ctx_range(struct sk_msg_md, family):
case bpf_ctx_range(struct sk_msg_md, remote_ip4):
case bpf_ctx_range(struct sk_msg_md, local_ip4):
case bpf_ctx_range_till(struct sk_msg_md, remote_ip6[0], remote_ip6[3]):
case bpf_ctx_range_till(struct sk_msg_md, local_ip6[0], local_ip6[3]):
case bpf_ctx_range(struct sk_msg_md, remote_port):
case bpf_ctx_range(struct sk_msg_md, local_port):
case bpf_ctx_range(struct sk_msg_md, size):
if (size != sizeof(__u32))
return false;
break;
default:
return false;
}
if (off < 0 || off >= sizeof(struct sk_msg_md))
return false;
if (off % size != 0)
return false;
return true;
}