Hi All,
I experience build failure with following Kconfig combination:
CONFIG_DEBUG=n and CONFIG_XEN_IBT=n
with gcc:
gcc --version
gcc (Ubuntu 11.4.0-1ubuntu1~22.04.2) 11.4.0
Copyright (C) 2021 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Is this known issue?
====== log ===============
CC arch/x86/x86_emulate.o
In file included from arch/x86/x86_emulate.c:27:
arch/x86/x86_emulate/x86_emulate.c: In function ‘x86_emulate’:
arch/x86/x86_emulate/x86_emulate.c:70:36: error: writing 1 byte into a region
of size 0 [-Werror=stringop-overflow=]
70 | gcc11_wrap(ptr)[0 - PFX_BYTES] = ext < ext_8f08 ? 0xc4 : 0x8f; \
arch/x86/x86_emulate/x86_emulate.c:78:9: note: in expansion of macro ‘copy_VEX’
78 | copy_VEX(ptr, vex); \
| ^~~~~~~~
arch/x86/x86_emulate/x86_emulate.c:8140:13: note: in expansion of macro
‘copy_REX_VEX’
8140 | copy_REX_VEX(opc, rex_prefix, vex);
| ^~~~~~~~~~~~
In file included from arch/x86/x86_emulate/x86_emulate.c:11,
from arch/x86/x86_emulate.c:27:
arch/x86/x86_emulate/private.h:691:17: note: at offset [0, 4095] into
destination object of size [0, 9223372036854775807] allocated by
‘map_domain_page’
691 | (stb).ptr = map_domain_page(_mfn(this_cpu(stubs.mfn))) + \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/x86/x86_emulate/x86_emulate.c:60:21: note: in expansion of macro ‘get_stub’
60 | uint8_t *buf_ = get_stub(stub); \
| ^~~~~~~~
arch/x86/x86_emulate/x86_emulate.c:3354:15: note: in expansion of macro
‘init_prefixes’
3354 | opc = init_prefixes(stub);
| ^~~~~~~~~~~~~
arch/x86/x86_emulate/private.h:691:17: note: at offset [1, 4096] into
destination object of size [0, 9223372036854775807] allocated by
‘map_domain_page’
691 | (stb).ptr = map_domain_page(_mfn(this_cpu(stubs.mfn))) + \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/x86/x86_emulate/x86_emulate.c:94:21: note: in expansion of macro ‘get_stub’
94 | uint8_t *buf_ = get_stub(stub); \
| ^~~~~~~~
arch/x86/x86_emulate/x86_emulate.c:3402:15: note: in expansion of macro
‘init_evex’
3402 | opc = init_evex(stub);
[...]
--
Best regards,
-grygorii
