From 33a154a96e71a34a1bcca9f40da343dbbf7b38b4 Mon Sep 17 00:00:00 2001 From: Alexei Starovoitov Date: Thu, 1 Oct 2026 14:52:55 +0000 Subject: selftests/bpf: Test packet range of pointers sharing an id Add tests where two packet pointers share an id and tightening one pointer's umax from its var_off would put it less than their constant distance from the other's umax: with an index & 0x38 capped at 50, the base pointer keeps umax 50, so the pointer 8 bytes further on must keep umax 58, even though its known bits allow at most 56. These refused a valid program or accepted an out-of-bounds access before the fix: - check the advanced copy, load through the base: valid, was refused; - check the base, load the byte at base + 1 through a copy advanced by 8: was accepted; - check base + 4, load 4 bytes at base + 2 through base + 8: reads two bytes past the checked range, was accepted; - the same as the second with data_meta pointers checked against data: was accepted. These pass with and without the fix and cover nearby paths: - subtract an unknown scalar from a checked pointer and load below it (the range is kept across a new id); - reach a load through two paths whose checks cover 8 and 7 bytes after the loaded pointer; the second path must not be pruned by the first; - spill a copy of a pointer, check the pointer, fill the copy and load one byte past the checked range: the load is refused, and the copy has the range of the check. Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/20261001145255.855630-2-alexei.starovoitov@gmail.com Signed-off-by: Kumar Kartikeya Dwivedi --- include/net/protocol.h | 119 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 119 insertions(+) create mode 100644 include/net/protocol.h (limited to 'include/net/protocol.h') diff --git a/include/net/protocol.h b/include/net/protocol.h new file mode 100644 index 000000000..b2499f88f --- /dev/null +++ b/include/net/protocol.h @@ -0,0 +1,119 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * INET An implementation of the TCP/IP protocol suite for the LINUX + * operating system. INET is implemented using the BSD Socket + * interface as the means of communication with the user level. + * + * Definitions for the protocol dispatcher. + * + * Version: @(#)protocol.h 1.0.2 05/07/93 + * + * Author: Fred N. van Kempen, + * + * Changes: + * Alan Cox : Added a name field and a frag handler + * field for later. + * Alan Cox : Cleaned up, and sorted types. + * Pedro Roque : inet6 protocols + */ + +#ifndef _PROTOCOL_H +#define _PROTOCOL_H + +#include +#include +#if IS_ENABLED(CONFIG_IPV6) +#include +#endif +#include + +/* This is one larger than the largest protocol value that can be + * found in an ipv4 or ipv6 header. Since in both cases the protocol + * value is presented in a __u8, this is defined to be 256. + */ +#define MAX_INET_PROTOS 256 + +/* This is used to register protocols. */ +struct net_protocol { + int (*handler)(struct sk_buff *skb); + + /* This returns an error if we weren't able to handle the error. */ + int (*err_handler)(struct sk_buff *skb, u32 info); + + unsigned int no_policy:1, + /* does the protocol do more stringent + * icmp tag validation than simple + * socket lookup? + */ + icmp_strict_tag_validation:1; + u32 secret; +}; + +#if IS_ENABLED(CONFIG_IPV6) +struct inet6_protocol { + int (*handler)(struct sk_buff *skb); + + /* This returns an error if we weren't able to handle the error. */ + int (*err_handler)(struct sk_buff *skb, + struct inet6_skb_parm *opt, + u8 type, u8 code, int offset, + __be32 info); + + unsigned int flags; /* INET6_PROTO_xxx */ + u32 secret; +}; + +#define INET6_PROTO_NOPOLICY 0x1 +#define INET6_PROTO_FINAL 0x2 +#endif + +struct net_offload { + struct offload_callbacks callbacks; + unsigned int flags; /* Flags used by IPv6 for now */ + u32 secret; +}; +/* This should be set for any extension header which is compatible with GSO. */ +#define INET6_PROTO_GSO_EXTHDR 0x1 + +/* This is used to register socket interfaces for IP protocols. */ +struct inet_protosw { + struct list_head list; + + /* These two fields form the lookup key. */ + unsigned short type; /* This is the 2nd argument to socket(2). */ + unsigned short protocol; /* This is the L4 protocol number. */ + + struct proto *prot; + const struct proto_ops *ops; + + unsigned char flags; /* See INET_PROTOSW_* below. */ +}; +#define INET_PROTOSW_REUSE 0x01 /* Are ports automatically reusable? */ +#define INET_PROTOSW_PERMANENT 0x02 /* Permanent protocols are unremovable. */ +#define INET_PROTOSW_ICSK 0x04 /* Is this an inet_connection_sock? */ + +extern struct net_protocol __rcu *inet_protos[MAX_INET_PROTOS]; +extern const struct net_offload __rcu *inet_offloads[MAX_INET_PROTOS]; +extern const struct net_offload __rcu *inet6_offloads[MAX_INET_PROTOS]; + +#if IS_ENABLED(CONFIG_IPV6) +extern struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS]; +#endif + +int inet_add_protocol(const struct net_protocol *prot, unsigned char num); +int inet_del_protocol(const struct net_protocol *prot, unsigned char num); +int inet_add_offload(const struct net_offload *prot, unsigned char num); +int inet_del_offload(const struct net_offload *prot, unsigned char num); +void inet_register_protosw(struct inet_protosw *p); +void inet_unregister_protosw(struct inet_protosw *p); + +#if IS_ENABLED(CONFIG_IPV6) +int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char num); +int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char num); +int inet6_register_protosw(struct inet_protosw *p); +void inet6_unregister_protosw(struct inet_protosw *p); +#endif +int inet6_add_offload(const struct net_offload *prot, unsigned char num); +int inet6_del_offload(const struct net_offload *prot, unsigned char num); + +#endif /* _PROTOCOL_H */ -- cgit v1.3.1