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Linus Torvalds 4356e9f841 work around gcc bugs with 'asm goto' with outputs 
We've had issues with gcc and 'asm goto' before, and we created a
'asm_volatile_goto()' macro for that in the past: see commits
3f0116c323 ("compiler/gcc4: Add quirk for 'asm goto' miscompilation
bug") and a9f180345f ("compiler/gcc4: Make quirk for
asm_volatile_goto() unconditional").

Then, much later, we ended up removing the workaround in commit
43c249ea0b ("compiler-gcc.h: remove ancient workaround for gcc PR
58670") because we no longer supported building the kernel with the
affected gcc versions, but we left the macro uses around.

Now, Sean Christopherson reports a new version of a very similar
problem, which is fixed by re-applying that ancient workaround.  But the
problem in question is limited to only the 'asm goto with outputs'
cases, so instead of re-introducing the old workaround as-is, let's
rename and limit the workaround to just that much less common case.

It looks like there are at least two separate issues that all hit in
this area:

 (a) some versions of gcc don't mark the asm goto as 'volatile' when it
     has outputs:

        https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98619
        https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110420

     which is easy to work around by just adding the 'volatile' by hand.

 (b) Internal compiler errors:

        https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110422

     which are worked around by adding the extra empty 'asm' as a
     barrier, as in the original workaround.

but the problem Sean sees may be a third thing since it involves bad
code generation (not an ICE) even with the manually added 'volatile'.

but the same old workaround works for this case, even if this feels a
bit like voodoo programming and may only be hiding the issue.

Reported-and-tested-by: Sean Christopherson <seanjc@google.com>
Link: https://lore.kernel.org/all/20240208220604.140859-1-seanjc@google.com/
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Uros Bizjak <ubizjak@gmail.com>
Cc: Jakub Jelinek <jakub@redhat.com>
Cc: Andrew Pinski <quic_apinski@quicinc.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2024-02-09 15:57:48 -08:00
..
ipset netfilter: ipset: Missing gc cancellations fixed 2024-02-08 12:09:23 +01:00
ipvs ipvs: avoid stat macros calls from preemptible context 2024-01-17 12:02:51 +01:00
Kconfig bpf: add bpf_link support for BPF_NETFILTER programs 2023-04-21 11:34:14 -07:00
Makefile bpf: add bpf_link support for BPF_NETFILTER programs 2023-04-21 11:34:14 -07:00
core.c netfilter: make nftables drops visible in net dropmonitor 2023-10-18 10:26:43 +02:00
nf_bpf_link.c Revert BPF token-related functionality 2023-12-19 08:23:03 -08:00
nf_conncount.c
…
nf_conntrack_acct.c
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nf_conntrack_amanda.c
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nf_conntrack_bpf.c bpf: Add __bpf_kfunc_{start,end}_defs macros 2023-11-01 22:33:53 -07:00
nf_conntrack_broadcast.c netfilter: add missing module descriptions 2023-11-08 13:52:32 +01:00
nf_conntrack_core.c netfilter: conntrack: convert nf_conntrack_update to netfilter verdicts 2023-10-18 10:26:43 +02:00
nf_conntrack_ecache.c
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nf_conntrack_expect.c netfilter: allow exp not to be removed in nf_ct_find_expectation 2023-07-20 10:06:36 +02:00
nf_conntrack_extend.c netfilter: conntrack: fix extension size table 2023-09-13 21:57:50 +02:00
nf_conntrack_ftp.c
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nf_conntrack_h323_asn1.c
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nf_conntrack_h323_main.c
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nf_conntrack_h323_types.c
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nf_conntrack_helper.c netfilter: conntrack: simplify nf_conntrack_alter_reply 2023-10-10 16:34:28 +02:00
nf_conntrack_irc.c
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nf_conntrack_labels.c netfilter: conntrack: switch connlabels to atomic_t 2023-10-24 13:16:30 +02:00
nf_conntrack_netbios_ns.c
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nf_conntrack_netlink.c netfilter: ctnetlink: fix filtering for zone 0 2024-02-08 12:10:18 +01:00
nf_conntrack_ovs.c
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nf_conntrack_pptp.c
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nf_conntrack_proto.c netfilter: add missing module descriptions 2023-11-08 13:52:32 +01:00
nf_conntrack_proto_dccp.c nf_conntrack: fix -Wunused-const-variable= 2023-07-27 13:45:51 +02:00
nf_conntrack_proto_generic.c
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nf_conntrack_proto_gre.c netfilter: conntrack: gre: don't set assured flag for clash entries 2023-07-05 14:42:15 +02:00
nf_conntrack_proto_icmp.c
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nf_conntrack_proto_icmpv6.c
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nf_conntrack_proto_sctp.c netfilter: conntrack: check SCTP_CID_SHUTDOWN_ACK for vtag setting in sctp_new 2024-01-31 23:13:57 +01:00
nf_conntrack_proto_tcp.c netfilter: conntrack: correct window scaling with retransmitted SYN 2024-01-31 23:07:04 +01:00
nf_conntrack_proto_udp.c
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nf_conntrack_sane.c
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nf_conntrack_seqadj.c
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nf_conntrack_sip.c netfilter: nf_conntrack_sip: fix the ct_sip_parse_numerical_param() return value. 2023-06-26 17:18:48 +02:00
nf_conntrack_snmp.c
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nf_conntrack_standalone.c netfilter: Update to register_net_sysctl_sz 2023-08-15 15:26:17 -07:00
nf_conntrack_tftp.c
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nf_conntrack_timeout.c
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nf_conntrack_timestamp.c
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nf_dup_netdev.c
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nf_flow_table_core.c netfilter: flowtable: GC pushes back packets to classic path 2023-10-25 11:35:46 +02:00
nf_flow_table_inet.c
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nf_flow_table_ip.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2023-06-15 22:19:41 -07:00
nf_flow_table_offload.c net: flow_dissector: Use 64bits for used_keys 2023-07-31 09:11:24 +01:00
nf_flow_table_procfs.c
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nf_hooks_lwtunnel.c
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nf_internals.h
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nf_log.c netfilter: nf_log: replace BUG_ON by WARN_ON_ONCE when putting logger 2024-01-31 23:14:13 +01:00
nf_log_syslog.c netfilter: propagate net to nf_bridge_get_physindev 2024-01-17 12:02:48 +01:00
nf_nat_amanda.c
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nf_nat_bpf.c bpf: Add __bpf_kfunc_{start,end}_defs macros 2023-11-01 22:33:53 -07:00
nf_nat_core.c netfilter: add missing module descriptions 2023-11-08 13:52:32 +01:00
nf_nat_ftp.c
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nf_nat_helper.c
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nf_nat_irc.c
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nf_nat_masquerade.c
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nf_nat_ovs.c netfilter: nf_nat: fix action not being set for all ct states 2024-01-03 11:17:17 +01:00
nf_nat_proto.c ipsec-next-2023-10-28 2023-10-30 14:36:57 -07:00
nf_nat_redirect.c netfilter: nat: fix ipv6 nat redirect with mapped and scoped addresses 2023-11-08 16:40:30 +01:00
nf_nat_sip.c
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nf_nat_tftp.c
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nf_queue.c netfilter: propagate net to nf_bridge_get_physindev 2024-01-17 12:02:48 +01:00
nf_sockopt.c
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nf_synproxy_core.c tcp: Don't pass cookie to __cookie_v[46]_check(). 2023-11-29 20:16:19 -08:00
nf_tables_api.c netfilter: nf_tables: use timestamp to check for set element timeout 2024-02-08 12:10:19 +01:00
nf_tables_core.c netfilter: nf_tables: set transport offset from mac header for netdev/egress 2023-12-20 10:43:21 +01:00
nf_tables_offload.c net: flow_dissector: Use 64bits for used_keys 2023-07-31 09:11:24 +01:00
nf_tables_trace.c netfilter: nf_tables: mask out non-verdict bits when checking return value 2023-10-18 10:26:43 +02:00
nfnetlink.c netfilter: nfnetlink: skip error delivery on batch in case of ENOMEM 2023-06-08 04:00:02 +02:00
nfnetlink_acct.c
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nfnetlink_cthelper.c
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nfnetlink_cttimeout.c
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nfnetlink_hook.c netfilter: nfnetlink hook: dump bpf prog id 2023-04-21 11:34:14 -07:00
nfnetlink_log.c netfilter: nfnetlink_log: use proper helper for fetching physinif 2024-01-17 12:02:47 +01:00
nfnetlink_osf.c netfilter: add missing module descriptions 2023-11-08 13:52:32 +01:00
nfnetlink_queue.c netfilter: nfnetlink_queue: un-break NF_REPEAT 2024-02-08 12:10:19 +01:00
nft_bitwise.c netfilter pull request 23-06-26 2023-06-26 12:59:18 -07:00
nft_byteorder.c netfilter: nf_tables: fix pointer math issue in nft_byteorder_eval() 2023-11-14 16:16:21 +01:00
nft_chain_filter.c netfilter: nft_chain_filter: handle NETDEV_UNREGISTER for inet/ingress basechain 2024-01-24 19:50:21 +01:00
nft_chain_nat.c netfilter: add missing module descriptions 2023-11-08 13:52:32 +01:00
nft_chain_route.c
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nft_cmp.c net: flow_dissector: Use 64bits for used_keys 2023-07-31 09:11:24 +01:00
nft_compat.c netfilter: nft_compat: restrict match/target protocol to u16 2024-02-07 22:02:52 +01:00
nft_connlimit.c
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nft_counter.c
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nft_ct.c netfilter: nft_ct: reject direction for ct id 2024-02-08 12:10:19 +01:00
nft_ct_fast.c netfilter: nf_tables: fix ct untracked match breakage 2023-05-03 13:49:08 +02:00
nft_dup_netdev.c
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nft_dynset.c netfilter: nf_tables: bail out on mismatching dynset and set expressions 2023-12-06 17:15:43 +01:00
nft_exthdr.c netfilter: nf_tables: fix 'exist' matching on bigendian arches 2023-12-06 17:15:42 +01:00
nft_fib.c netfilter: nf_tables: fix 'exist' matching on bigendian arches 2023-12-06 17:15:42 +01:00
nft_fib_inet.c
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nft_fib_netdev.c
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nft_flow_offload.c netfilter: nf_tables: validate NFPROTO_* family 2024-01-24 20:02:40 +01:00
nft_fwd_netdev.c netfilter: add missing module descriptions 2023-11-08 13:52:32 +01:00
nft_hash.c netfilter: nf_tables: limit allowed range via nla_policy 2023-06-26 08:05:57 +02:00
nft_immediate.c netfilter: nft_immediate: drop chain reference counter on error 2024-01-03 11:17:17 +01:00
nft_inner.c nf_tables: fix NULL pointer dereference in nft_inner_init() 2023-10-12 10:28:45 +02:00
nft_last.c
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nft_limit.c netfilter: nft_limit: reject configurations that cause integer overflow 2024-01-24 20:01:16 +01:00
nft_log.c
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nft_lookup.c netfilter: nf_tables: use NLA_POLICY_MASK to test for valid flag options 2023-07-27 13:45:51 +02:00
nft_masq.c netfilter: nf_tables: use NLA_POLICY_MASK to test for valid flag options 2023-07-27 13:45:51 +02:00
nft_meta.c netfilter: nf_tables: fix pointer math issue in nft_byteorder_eval() 2023-11-14 16:16:21 +01:00
nft_nat.c netfilter: nf_tables: validate NFPROTO_* family 2024-01-24 20:02:40 +01:00
nft_numgen.c
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nft_objref.c netfilter: nf_tables: report use refcount overflow 2023-07-05 14:42:15 +02:00
nft_osf.c netfilter: nft_osf: refactor deprecated strncpy 2023-08-22 15:13:21 +02:00
nft_payload.c netfilter: nft_payload: fix wrong mac header matching 2023-10-12 10:28:45 +02:00
nft_queue.c
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nft_quota.c
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nft_range.c netfilter: nf_tables: limit allowed range via nla_policy 2023-06-26 08:05:57 +02:00
nft_redir.c netfilter: nf_tables: use NLA_POLICY_MASK to test for valid flag options 2023-07-27 13:45:51 +02:00
nft_reject.c netfilter: nf_tables: limit allowed range via nla_policy 2023-06-26 08:05:57 +02:00
nft_reject_inet.c
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nft_reject_netdev.c
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nft_rt.c netfilter: nf_tables: validate NFPROTO_* family 2024-01-24 20:02:40 +01:00
nft_set_bitmap.c netfilter: nf_tables: set->ops->insert returns opaque set element in case of EEXIST 2023-10-24 13:37:46 +02:00
nft_set_hash.c netfilter: nf_tables: use timestamp to check for set element timeout 2024-02-08 12:10:19 +01:00
nft_set_pipapo.c netfilter: nft_set_pipapo: remove scratch_aligned pointer 2024-02-08 12:24:02 +01:00
nft_set_pipapo.h netfilter: nft_set_pipapo: remove scratch_aligned pointer 2024-02-08 12:24:02 +01:00
nft_set_pipapo_avx2.c work around gcc bugs with 'asm goto' with outputs 2024-02-09 15:57:48 -08:00
nft_set_pipapo_avx2.h
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nft_set_rbtree.c netfilter: nft_set_rbtree: skip end interval element from gc 2024-02-08 12:10:19 +01:00
nft_socket.c netfilter: nf_tables: validate NFPROTO_* family 2024-01-24 20:02:40 +01:00
nft_synproxy.c netfilter: nf_tables: validate NFPROTO_* family 2024-01-24 20:02:40 +01:00
nft_tproxy.c netfilter: nf_tables: validate NFPROTO_* family 2024-01-24 20:02:40 +01:00
nft_tunnel.c netfilter: nf_tables: restrict tunnel object to NFPROTO_NETDEV 2024-01-31 23:07:04 +01:00
nft_xfrm.c netfilter: nf_tables: validate NFPROTO_* family 2024-01-24 20:02:40 +01:00
utils.c
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x_tables.c netfilter: x_tables: refactor deprecated strncpy 2023-08-22 15:13:21 +02:00
xt_AUDIT.c
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xt_CHECKSUM.c
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xt_CLASSIFY.c
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xt_CONNSECMARK.c
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xt_CT.c
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xt_DSCP.c
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xt_HL.c
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xt_HMARK.c
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xt_IDLETIMER.c
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xt_LED.c leds: Change led_trigger_blink[_oneshot]() delay parameters to pass-by-value 2023-05-25 12:16:27 +01:00
xt_LOG.c
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xt_MASQUERADE.c
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xt_NETMAP.c
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xt_NFLOG.c
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xt_NFQUEUE.c
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xt_RATEEST.c
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xt_REDIRECT.c
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xt_SECMARK.c
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xt_TCPMSS.c
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xt_TCPOPTSTRIP.c
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xt_TEE.c
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xt_TPROXY.c
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xt_TRACE.c
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xt_addrtype.c
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xt_bpf.c
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xt_cgroup.c
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xt_cluster.c
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xt_comment.c
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xt_connbytes.c
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xt_connlabel.c
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xt_connlimit.c
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xt_connmark.c
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xt_conntrack.c
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xt_cpu.c
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xt_dccp.c
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xt_devgroup.c
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xt_dscp.c
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xt_ecn.c
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xt_esp.c
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xt_hashlimit.c
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xt_helper.c
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xt_hl.c
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xt_ipcomp.c
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xt_iprange.c
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xt_ipvs.c
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xt_l2tp.c
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xt_length.c
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xt_limit.c
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xt_mac.c
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xt_mark.c
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xt_multiport.c
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xt_nat.c
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xt_nfacct.c
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xt_osf.c netfilter: nfnetlink_osf: fix module autoload 2023-06-20 22:43:42 +02:00
xt_owner.c netfilter: xt_owner: Fix for unsafe access of sk->sk_socket 2023-12-06 17:52:15 +01:00
xt_physdev.c netfilter: propagate net to nf_bridge_get_physindev 2024-01-17 12:02:48 +01:00
xt_pkttype.c
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xt_policy.c
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xt_quota.c
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xt_rateest.c
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xt_realm.c
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xt_recent.c netfilter: xt_recent: fix (increase) ipv6 literal buffer length 2023-11-08 13:53:36 +01:00
xt_repldata.h netfilter: xtables: refactor deprecated strncpy 2023-08-22 15:13:21 +02:00
xt_sctp.c netfilter: xt_sctp: validate the flag_info count 2023-08-30 17:34:01 +02:00
xt_set.c
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xt_socket.c net: annotate data-races around sk->sk_mark 2023-07-29 18:13:41 +01:00
xt_state.c
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xt_statistic.c
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xt_string.c
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xt_tcpmss.c
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xt_tcpudp.c xtables: move icmp/icmpv6 logic to xt_tcpudp 2023-03-22 21:48:59 +01:00
xt_time.c
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xt_u32.c netfilter: xt_u32: validate user space input 2023-08-30 17:34:01 +02:00