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mirror-linux/net/core
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Eduard Zingerman 1a4607ffba bpf: consider that tail calls invalidate packet pointers 
Tail-called programs could execute any of the helpers that invalidate
packet pointers. Hence, conservatively assume that each tail call
invalidates packet pointers.

Making the change in bpf_helper_changes_pkt_data() automatically makes
use of check_cfg() logic that computes 'changes_pkt_data' effect for
global sub-programs, such that the following program could be
rejected:

    int tail_call(struct __sk_buff *sk)
    {
    	bpf_tail_call_static(sk, &jmp_table, 0);
    	return 0;
    }

    SEC("tc")
    int not_safe(struct __sk_buff *sk)
    {
    	int *p = (void *)(long)sk->data;
    	... make p valid ...
    	tail_call(sk);
    	*p = 42; /* this is unsafe */
    	...
    }

The tc_bpf2bpf.c:subprog_tc() needs change: mark it as a function that
can invalidate packet pointers. Otherwise, it can't be freplaced with
tailcall_freplace.c:entry_freplace() that does a tail call.

Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20241210041100.1898468-8-eddyz87@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
 		2024-12-10 10:24:57 -08:00
..
Makefile net: Implement fault injection forcing skb reallocation 2024-11-12 12:05:33 +01:00
bpf_sk_storage.c bpf: Add "bool swap_uptrs" arg to bpf_local_storage_update() and bpf_selem_alloc() 2024-10-24 10:25:59 -07:00
datagram.c net: add support for skbs with unreadable frags 2024-09-11 20:44:31 -07:00
dev.c net: Make napi_hash_lock irq safe 2024-12-03 18:25:33 -08:00
dev.h net: Add napi_struct parameter irq_suspend_timeout 2024-11-11 18:45:05 -08:00
dev_addr_lists.c net: Correct spelling in net/core 2024-08-26 09:37:23 -07:00
dev_addr_lists_test.c net: dev_addr_lists: move locking out of init/exit in kunit 2024-04-15 10:26:35 +01:00
dev_ioctl.c ipv4: Convert devinet_ioctl to per-netns RTNL. 2024-10-29 11:54:58 +01:00
devmem.c memory-provider: dmabuf devmem memory provider 2024-09-11 20:44:31 -07:00
devmem.h tcp: RX path for devmem TCP 2024-09-11 20:44:32 -07:00
drop_monitor.c move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
dst.c net: do not delay dst_entries_add() in dst_release() 2024-10-10 11:28:17 +02:00
dst_cache.c net: dst_cache: add two DEBUG_NET warnings 2024-06-03 18:50:09 -07:00
failover.c
…
fib_notifier.c net: do not acquire rtnl in fib_seq_sum() 2024-10-11 15:35:05 -07:00
fib_rules.c net: convert to nla_get_*_default() 2024-11-11 10:32:06 -08:00
filter.c bpf: consider that tail calls invalidate packet pointers 2024-12-10 10:24:57 -08:00
flow_dissector.c net: flow_dissector: use DEBUG_NET_WARN_ON_ONCE 2024-07-18 10:52:17 +02:00
flow_offload.c
…
gen_estimator.c net: use unrcu_pointer() helper 2024-06-06 11:52:52 +02:00
gen_stats.c
…
gro.c net: Add netif_get_gro_max_size helper for GRO 2024-10-01 10:48:51 +02:00
gro_cells.c net: move netdev_max_backlog to net_hotdata 2024-03-07 21:12:42 -08:00
gso.c net: introduce struct net_hotdata 2024-03-07 21:12:41 -08:00
hotdata.c net: move sysctl_mem_pcpu_rsv to net_hotdata 2024-04-30 18:46:52 -07:00
hwbm.c
…
ieee8021q_helpers.c net: add IEEE 802.1q specific helpers 2024-05-08 10:35:09 +01:00
link_watch.c net: avoid potential UAF in default_operstate() 2024-12-05 11:57:26 +01:00
lwt_bpf.c bpf: lwtunnel: Prepare bpf_lwt_xmit_reroute() to future .flowi4_tos conversion. 2024-11-14 19:07:49 -08:00
lwtunnel.c
…
mp_dmabuf_devmem.h memory-provider: dmabuf devmem memory provider 2024-09-11 20:44:31 -07:00
neighbour.c net/neighbor: clear error in case strict check is not set 2024-11-18 18:42:21 -08:00
net-procfs.c net: make softnet_data.dropped an atomic_t 2024-04-01 11:28:32 +01:00
net-sysfs.c net: napi: Make gro_flush_timeout per-NAPI 2024-10-14 17:54:29 -07:00
net-sysfs.h
…
net-traces.c move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
net_namespace.c Networking changes for 6.13. 2024-11-21 08:28:08 -08:00
net_test.c pfcp: always set pfcp metadata 2024-04-01 10:49:28 +01:00
netclassid_cgroup.c cgroup, netclassid: on modifying netclassid in cgroup, only consider the main process. 2023-10-16 16:36:53 -07:00
netdev-genl-gen.c net: Add napi_struct parameter irq_suspend_timeout 2024-11-11 18:45:05 -08:00
netdev-genl-gen.h netdev-genl: Support setting per-NAPI config values 2024-10-14 17:54:29 -07:00
netdev-genl.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2024-11-19 13:56:02 +01:00
netdev_rx_queue.c memory-provider: dmabuf devmem memory provider 2024-09-11 20:44:31 -07:00
netevent.c
…
netmem_priv.h page_pool: devmem support 2024-09-11 20:44:31 -07:00
netpoll.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2024-11-19 13:56:02 +01:00
netprio_cgroup.c
…
of_net.c
…
page_pool.c net: page_pool: do not count normal frag allocation in stats 2024-11-12 18:26:58 -08:00
page_pool_priv.h memory-provider: dmabuf devmem memory provider 2024-09-11 20:44:31 -07:00
page_pool_user.c netdev: add dmabuf introspection 2024-09-11 20:44:32 -07:00
pktgen.c net: pktgen: Switch to use hrtimer_setup_sleeper_on_stack() 2024-11-07 02:47:06 +01:00
ptp_classifier.c
…
request_sock.c tcp: make sure init the accept_queue's spinlocks once 2024-01-19 21:13:25 -08:00
rtnetlink.c rtnetlink: fix double call of rtnl_link_get_net_ifla() 2024-12-03 11:29:29 +01:00
rtnl_net_debug.c rtnl_net_debug: Remove rtnl_net_debug_exit(). 2024-10-15 13:40:55 +02:00
scm.c af_unix: Add dead flag to struct scm_fp_list. 2024-05-10 18:52:45 -07:00
secure_seq.c
…
selftests.c net: fill in MODULE_DESCRIPTION()s under net/core 2023-10-28 11:29:27 +01:00
skb_fault_injection.c net: Implement fault injection forcing skb reallocation 2024-11-12 12:05:33 +01:00
skbuff.c mm: page_frag: avoid caller accessing 'page_frag_cache' directly 2024-11-11 10:56:27 -08:00
skmsg.c bpf: fix recursive lock when verdict program return SK_PASS 2024-11-18 19:39:59 -08:00
sock.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2024-11-14 11:29:15 -08:00
sock_destructor.h
…
sock_diag.c net: use unrcu_pointer() helper 2024-06-06 11:52:52 +02:00
sock_map.c bpf, sockmap: Fix race between element replace and close() 2024-12-10 17:38:05 +01:00
sock_reuseport.c net: core: annotate socks of struct sock_reuseport with __counted_by 2024-08-02 17:16:59 -07:00
stream.c net: Return error from sk_stream_wait_connect() if sk_wait_event() fails 2023-12-15 10:48:51 +00:00
sysctl_net_core.c net: sysctl: allow dump_cpumask to handle higher numbers of CPUs 2024-10-23 10:28:26 +02:00
timestamping.c net: Change the API of PHY default timestamp to MAC 2024-07-15 08:02:26 -07:00
tso.c move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
utils.c net: Correct spelling in net/core 2024-08-26 09:37:23 -07:00
xdp.c xdp: fix invalid wait context of page_pool_destroy() 2024-07-14 20:40:21 -07:00