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authorNeal Cardwell <ncardwell@google.com>2012-12-09 11:09:54 +0000
committerDavid S. Miller <davem@davemloft.net>2012-12-09 19:00:48 -0500
commit5e1f54201cb481f40a04bc47e1bc8c093a189e23 (patch)
treef5fa04ab4f52467197692f6ddf3cb56d5908595e
parentf67caec9068cee426ec23cf9005a1dee2ecad187 (diff)
inet_diag: validate port comparison byte code to prevent unsafe reads
Add logic to verify that a port comparison byte code operation actually has the second inet_diag_bc_op from which we read the port for such operations. Previously the code blindly referenced op[1] without first checking whether a second inet_diag_bc_op struct could fit there. So a malicious user could make the kernel read 4 bytes beyond the end of the bytecode array by claiming to have a whole port comparison byte code (2 inet_diag_bc_op structs) when in fact the bytecode was not long enough to hold both. Signed-off-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/ipv4/inet_diag.c31
1 files changed, 24 insertions, 7 deletions
diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c
index 95f1a458371..e23e16dc501 100644
--- a/net/ipv4/inet_diag.c
+++ b/net/ipv4/inet_diag.c
@@ -557,6 +557,17 @@ static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
return true;
}
+/* Validate a port comparison operator. */
+static inline bool valid_port_comparison(const struct inet_diag_bc_op *op,
+ int len, int *min_len)
+{
+ /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
+ *min_len += sizeof(struct inet_diag_bc_op);
+ if (len < *min_len)
+ return false;
+ return true;
+}
+
static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
{
const void *bc = bytecode;
@@ -572,24 +583,30 @@ static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
case INET_DIAG_BC_D_COND:
if (!valid_hostcond(bc, len, &min_len))
return -EINVAL;
- /* fall through */
- case INET_DIAG_BC_AUTO:
+ break;
case INET_DIAG_BC_S_GE:
case INET_DIAG_BC_S_LE:
case INET_DIAG_BC_D_GE:
case INET_DIAG_BC_D_LE:
- case INET_DIAG_BC_JMP:
- if (op->no < min_len || op->no > len + 4 || op->no & 3)
- return -EINVAL;
- if (op->no < len &&
- !valid_cc(bytecode, bytecode_len, len - op->no))
+ if (!valid_port_comparison(bc, len, &min_len))
return -EINVAL;
break;
+ case INET_DIAG_BC_AUTO:
+ case INET_DIAG_BC_JMP:
case INET_DIAG_BC_NOP:
break;
default:
return -EINVAL;
}
+
+ if (op->code != INET_DIAG_BC_NOP) {
+ if (op->no < min_len || op->no > len + 4 || op->no & 3)
+ return -EINVAL;
+ if (op->no < len &&
+ !valid_cc(bytecode, bytecode_len, len - op->no))
+ return -EINVAL;
+ }
+
if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
return -EINVAL;
bc += op->yes;