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da1ea35fea67ad841f4ada28dd61b41be65e5437
linux/arch/s390/include/asm
History
Claudio Imbrenda 496e0f706b KVM: s390: Fix unlikely NULL gmap dereference 
When creating a new vCPU, kvm_vm_ioctl_create_vcpu() will call
kvm_arch_vcpu_postcreate() after the file descriptor for the new vCPU
has been created. The new file descriptor has not been returned yet,
but a malicious userspace program could try to guess it.

If a malicious userspace program manages to start the newly created vCPU
before kvm_arch_vcpu_postcreate() is called, __vcpu_run() will try to
dereference vcpu->arch.gmap and trigger a NULL pointer dereference.

Fix this by adding a new field to struct kvm_vcpu_arch to keep track of
the initialization status of the vCPU. Refuse to run a vCPU that is not
fully initialized.

Fixes: dafd032a15 ("KVM: s390: move vcpu specific initalization to a later point")
Fixes: e38c884df9 ("KVM: s390: Switch to new gmap")
Reviewed-by: Steffen Eiden <seiden@linux.ibm.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Message-ID: <20260803124040.126471-2-imbrenda@linux.ibm.com>
2026-08-03 15:39:05 +02:00
..
trace
s390/ap: Introduce new AP nqap and dqap trace events
2025-10-21 11:09:21 +02:00
vdso
s390/processor: Implement cpu_relax() with cpu serialization
2026-05-20 09:48:04 +02:00
abs_lowcore.h
s390/lowcore: Convert relocated lowcore alternative to machine feature
2025-03-04 17:18:05 +01:00
access-regs.h
s390/acrs: cleanup access register handling
2024-02-12 15:03:33 +01:00
airq.h
s390/airq: remove lsi_mask from airq_struct
2023-08-30 11:03:28 +02:00
alternative.h
s390: Replace __ASSEMBLY__ with __ASSEMBLER__ in non-uapi headers
2025-06-16 16:23:02 +02:00
ap.h
s390/ap: Fix typo in function name reference
2026-01-02 13:23:48 +01:00
appldata.h
s390: Convert MACHINE_IS_[LPAR|VM|KVM], etc, machine_is_[lpar|vm|kvm]()
2025-03-04 17:18:07 +01:00
arch_hweight.h
s390: Use MARCH_HAS_*_FEATURES defines
2024-09-07 17:12:42 +02:00
arch-stackprotector.h
s390: Add stackprotector support
2025-11-24 11:45:21 +01:00
archrandom.h
Merge tag 'random-6.0-rc1-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/crng/random
2022-08-02 17:31:35 -07:00
asce.h
s390/mm: Reimplement lazy ASCE handling
2025-04-14 11:23:21 +02:00
asm-const.h
s390: Replace __ASSEMBLY__ with __ASSEMBLER__ in non-uapi headers
2025-06-16 16:23:02 +02:00
asm-extable.h
s390: Revert support for DCACHE_WORD_ACCESS
2026-06-12 11:30:25 +02:00
asm-prototypes.h
s390/tishift: Convert __ashlti3(), __ashrti3(), __lshrti3() to C
2026-06-10 16:55:22 +02:00
asm.h
s390/asm: Let __HAVE_ASM_FLAG_OUTPUTS__ define 1
2026-01-17 15:52:49 +01:00
atomic_ops.h
s390: Remove superfluous newlines from inline assemblies
2025-09-29 13:52:08 +02:00
atomic.h
s390/atomic: Provide arch_atomic_*_and_test() implementations
2024-12-15 16:19:03 +01:00
barrier.h
s390/barrier: Use alternative instead of ifdef for bcr_serialize()
2026-05-20 09:48:03 +02:00
bitops.h
Merge tag 's390-6.18-2' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
2025-10-09 10:51:43 -07:00
boot_data.h
s390/boot: Add timestamps to early boot messages
2025-01-26 17:24:02 +01:00
bug.h
Merge tag 's390-7.2-1' of gitolite.kernel.org:pub/scm/linux/kernel/git/s390/linux
2026-06-16 05:08:13 +05:30
cache.h
treewide: Convert macro and uses of __section(foo) to __section("foo")
2020-10-25 14:51:49 -07:00
ccwdev.h
Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (headers)
2026-07-03 07:38:16 +02:00
ccwgroup.h
treewide: Replace zero-length arrays with flexible-array members
2022-02-17 07:00:39 -06:00
checksum.h
s390: Remove superfluous newlines from inline assemblies
2025-09-29 13:52:08 +02:00
chpid.h
…
chsc.h
s390/chsc: use notifier for AP configuration changes
2024-04-09 17:29:55 +02:00
cio.h
s390/tape: Introduce idal buffer array
2025-10-21 10:25:55 +02:00
clocksource.h
s390: convert to GENERIC_VDSO
2020-08-26 18:47:21 +02:00
clp.h
s390/pci: Implement ioremap_wc/prot() with MIO
2020-09-14 10:30:07 +02:00
cmb.h
…
cmpxchg.h
s390/cmpxchg: Fix KASAN stack-out-of-bounds in atomic helpers
2026-06-10 16:25:13 +02:00
cpacf.h
s390: Remove superfluous newlines from inline assemblies
2025-09-29 13:52:08 +02:00
cpcmd.h
…
cpu_mf-insn.h
s390: Replace __ASSEMBLY__ with __ASSEMBLER__ in non-uapi headers
2025-06-16 16:23:02 +02:00
cpu_mf.h
s390: Use inline qualifier for all EX_TABLE and ALTERNATIVE inline assemblies
2025-03-18 17:13:51 +01:00
cpu.h
s390: Replace __ASSEMBLY__ with __ASSEMBLER__ in non-uapi headers
2025-06-16 16:23:02 +02:00
cpufeature.h
s390/mm: Remove cpu_has_idte()
2025-11-06 14:12:31 +01:00
cputime.h
s390/idle: remove arch_cpu_idle_time() and corresponding code
2023-02-09 20:11:23 +01:00
crw.h
s390: remove invalid email address of Heiko Carstens
2022-02-06 23:31:29 +01:00
css_chars.h
s390/qdio: Rename feature flag aif_osa to aif_qdio
2025-01-03 11:00:53 +01:00
ctlreg.h
s390: Remove superfluous newlines from inline assemblies
2025-09-29 13:52:08 +02:00
current.h
s390/current: Implement current with inline assembly
2025-03-18 17:13:04 +01:00
dat-bits.h
KVM: s390: Add P bit in table entry bitfields, move union vaddress
2026-02-04 17:00:08 +01:00
debug.h
s390/debug: Add s390dbf kernel parameter
2026-05-11 16:42:31 +02:00
delay.h
s390/delay: remove udelay_simple()
2020-12-16 14:55:49 +01:00
diag288.h
watchdog: diag288_wdt: Implement module autoload
2025-04-16 09:26:49 +02:00
diag.h
s390: Use inline qualifier for all EX_TABLE and ALTERNATIVE inline assemblies
2025-03-18 17:13:51 +01:00
dis.h
…
dma-types.h
s390/mm: provide simple ARCH_HAS_DEBUG_VIRTUAL support
2024-03-13 09:23:49 +01:00
dma.h
s390/mm: fix MAX_DMA_ADDRESS physical vs virtual confusion
2023-09-05 20:12:51 +02:00
dwarf.h
s390: Replace __ASSEMBLY__ with __ASSEMBLER__ in non-uapi headers
2025-06-16 16:23:02 +02:00
eadm.h
s390/cio: use bitwise types to allow for type checking
2024-03-13 09:23:46 +01:00
ebcdic.h
s390/ebcdic: Fix length decrement in codepage_convert()
2025-01-13 09:50:18 +01:00
elf.h
s390/syscalls: Remove system call table pointer from thread_struct
2025-11-17 11:10:39 +01:00
entry-common.h
randomize_kstack: Unify random source across arches
2026-03-24 21:12:03 -07:00
entry-percpu.h
s390/percpu: Infrastructure for more efficient this_cpu operations
2026-06-03 15:32:46 +02:00
exec.h
…
extable.h
s390/extable: convert to relative table with data
2022-03-08 00:33:00 +01:00
extmem.h
s390: Replace __ASSEMBLY__ with __ASSEMBLER__ in non-uapi headers
2025-06-16 16:23:02 +02:00
facility.h
s390/facilities: Fix warning about shadow of global variable
2024-10-10 15:32:43 +02:00
fault.h
s390/mm: move translation-exception identification structure to fault.h
2023-10-23 18:21:22 +02:00
fcx.h
s390/cio: use bitwise types to allow for type checking
2024-03-13 09:23:46 +01:00
fprobe.h
fprobe: Add fprobe_header encoding feature
2024-12-26 10:50:05 -05:00
fpu-insn-asm.h
s390/fpu: Move GR_NUM / VX_NUM macros to separate header file
2026-06-03 15:32:44 +02:00
fpu-insn.h
s390/fpu: Move GR_NUM / VX_NUM macros to separate header file
2026-06-03 15:32:44 +02:00
fpu-types.h
s390/checksum: provide vector register variant of csum_partial()
2024-02-16 14:30:17 +01:00
fpu.h
s390/vx: Convert cpu_has_vx() to cpu feature function
2025-03-04 17:18:07 +01:00
ftrace.h
s390: Remove compat support
2025-11-17 11:10:38 +01:00
ftrace.lds.h
s390/ftrace: implement hotpatching
2021-08-03 14:31:40 +02:00
futex.h
s390/mm: Reimplement lazy ASCE handling
2025-04-14 11:23:21 +02:00
gmap_helpers.h
KVM: s390: Avoid potentially sleeping while atomic when zapping pages
2026-06-02 16:46:41 +02:00
hardirq.h
s390: Replace S390_lowcore by get_lowcore()
2024-06-18 17:01:33 +02:00
hiperdispatch.h
s390/hiperdispatch: Introduce hiperdispatch
2024-08-29 22:56:35 +02:00
hugetlb.h
s390/mm: Complete ptep_get() conversion
2026-06-16 17:30:31 +02:00
hw_irq.h
…
idals.h
Convert 'alloc_obj' family to use the new default GFP_KERNEL argument
2026-02-21 17:09:51 -08:00
idle.h
s390/idle: Remove idle time and count sysfs files
2026-06-15 16:33:40 +02:00
insn-common-asm.h
s390/fpu: Move GR_NUM / VX_NUM macros to separate header file
2026-06-03 15:32:44 +02:00
io.h
Merge tag 'mm-stable-2025-03-30-16-52' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2025-04-01 09:29:18 -07:00
ipl.h
s390/ipl: add eckd dump support
2022-12-06 16:18:22 +01:00
irq_work.h
arch: consolidate arch_irq_work_raise prototypes
2023-11-23 11:32:29 +01:00
irq.h
s390: Replace __ASSEMBLY__ with __ASSEMBLER__ in non-uapi headers
2025-06-16 16:23:02 +02:00
irqflags.h
s390/irqflags: do not instrument arch_local_irq_*() with KMSAN
2024-07-03 19:30:25 -07:00
isc.h
…
itcw.h
…
jump_label.h
s390/jump_label: Implement ARCH_STATIC_BRANCH_JUMP_ASM and ARCH_STATIC_BRANCH_ASM macros
2026-06-10 16:25:13 +02:00
kasan.h
s390/kasan: move shadow mapping to decompressor
2023-03-20 11:02:51 +01:00
Kbuild
ring-buffer: Flush and stop persistent ring buffer on panic
2026-05-21 08:20:58 -04:00
kdebug.h
exit: Remove calls of do_exit after noreturn versions of die
2021-10-20 13:09:47 -05:00
kexec.h
s390/kdump: Provide is_kdump_kernel() implementation
2024-10-25 16:03:23 +02:00
kfence.h
s390/kfence: Split kfence pool into 4k mappings in arch_kfence_init_pool()
2025-03-18 17:13:05 +01:00
kmsan.h
s390/kmsan: Fix merge conflict with get_lowcore() introduction
2024-07-23 16:01:51 +02:00
kprobes.h
kprobes: unify kprobes_exceptions_nofify() prototypes
2023-11-10 19:59:05 +09:00
kvm_host_types.h
KVM: s390: vsie: Accommodate ESA prefix pages
2026-04-02 15:37:01 +02:00
kvm_host.h
KVM: s390: Fix unlikely NULL gmap dereference
2026-08-03 15:39:05 +02:00
kvm_para.h
s390: Remove superfluous newlines from inline assemblies
2025-09-29 13:52:08 +02:00
linkage.h
s390: Implement _THIS_IP_ using inline asm
2026-05-30 11:33:32 +02:00
lowcore.h
Merge branch 'idle-time-acc' into features
2026-06-16 16:21:46 +02:00
maccess.h
s390/mm: define Real Memory Copy size and mask macros
2023-08-16 15:13:02 +02:00
machine.h
s390: Replace __ASSEMBLY__ with __ASSEMBLER__ in non-uapi headers
2025-06-16 16:23:02 +02:00
march.h
s390: Allow to compile with z17 optimizations
2025-04-09 12:12:41 +02:00
mem_encrypt.h
s390: Replace __ASSEMBLY__ with __ASSEMBLER__ in non-uapi headers
2025-06-16 16:23:02 +02:00
mmu_context.h
KVM: s390: Switch to new gmap
2026-02-04 17:00:10 +01:00
mmu.h
KVM: S390: Remove PGSTE code from linux/s390 mm
2026-02-04 17:00:10 +01:00
module.h
s390/module: Provide find_section() helper
2024-09-13 17:28:36 +02:00
msi.h
irq/s390: Add arch_is_isolated_msi() for s390
2023-01-11 16:27:23 -04:00
nmi.h
s390: Replace __ASSEMBLY__ with __ASSEMBLER__ in non-uapi headers
2025-06-16 16:23:02 +02:00
nospec-branch.h
s390: Replace __ASSEMBLY__ with __ASSEMBLER__ in non-uapi headers
2025-06-16 16:23:02 +02:00
nospec-insn.h
s390/vmlinux.lds.S: Prevent thunk functions from getting placed with normal text
2025-10-14 14:45:21 -07:00
numa.h
…
os_info.h
s390/os_info: Fix array size in struct os_info
2024-04-29 17:33:29 +02:00
page-states.h
s390: Remove __bootdata annotations from declarations
2024-12-15 16:19:04 +01:00
page.h
mm: convert do_brk_flags() to use vma_flags_t
2026-04-05 13:53:40 -07:00
pai.h
s390/pai_crypto: Introduce generic event init using pai_pmu[]
2025-11-14 11:30:05 +01:00
pci_clp.h
s390/pci: check for relaxed translation capability
2025-02-21 12:01:57 +01:00
pci_debug.h
s390/pci: add error record for CC 2 retries
2022-04-25 13:54:15 +02:00
pci_dma.h
iommu/s390: allow larger region tables
2025-04-17 16:43:12 +02:00
pci_insn.h
iommu/s390: Make attach succeed when the device was surprise removed
2025-09-05 15:11:09 +02:00
pci_io.h
s390/Kconfig: Define non-zero ILLEGAL_POINTER_VALUE
2026-01-27 12:21:20 +01:00
pci.h
PCI: s390: Expose the UID as an arch specific PCI slot attribute
2026-04-11 11:18:15 +02:00
percpu.h
s390/percpu: Provide arch_this_cpu_write() implementation
2026-06-03 15:32:47 +02:00
perf_event.h
Merge tag 'perf-core-2024-11-18' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2024-11-19 13:34:06 -08:00
pfault.h
s390/pfault: cleanup inline assemblies
2023-07-29 14:57:18 +02:00
pgalloc.h
KVM: S390: Remove PGSTE code from linux/s390 mm
2026-02-04 17:00:10 +01:00
pgtable.h
Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
2026-06-25 10:21:13 -07:00
physmem_info.h
s390/boot: Add physmem tracking debug support
2025-01-26 17:24:02 +01:00
pkey.h
s390/pkey: Support new xflag PKEY_XFLAG_NOCLEARKEY
2026-01-31 10:52:30 +08:00
pnet.h
…
preempt.h
s390/preempt: Optimize __preempt_count_dec_and_test()
2026-01-17 15:52:49 +01:00
processor.h
s390/processor: Remove duplicated cpu_relax() define
2026-05-20 09:48:04 +02:00
ptrace.h
s390/percpu: Infrastructure for more efficient this_cpu operations
2026-06-03 15:32:46 +02:00
purgatory.h
s390: Replace __ASSEMBLY__ with __ASSEMBLER__ in non-uapi headers
2025-06-16 16:23:02 +02:00
qdio.h
s390/cio: use bitwise types to allow for type checking
2024-03-13 09:23:46 +01:00
runtime_instr.h
…
runtime-const.h
s390: Add runtime constant support
2024-07-23 15:54:58 +02:00
rwonce.h
s390: Remove superfluous newlines from inline assemblies
2025-09-29 13:52:08 +02:00
schid.h
…
sclp.h
Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
2026-06-19 08:56:49 -07:00
scsw.h
s390/cio: use bitwise types to allow for type checking
2024-03-13 09:23:46 +01:00
seccomp.h
s390: Remove compat support
2025-11-17 11:10:38 +01:00
sections.h
s390/amode31: change type of __samode31, __eamode31, etc
2023-08-30 11:03:27 +02:00
set_memory.h
Merge tag 'mm-stable-2024-11-18-19-27' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2024-11-23 09:58:07 -08:00
setup.h
s390/setup: Drop stale ident_map_size declaration
2026-03-05 21:08:50 +01:00
signal.h
…
sigp.h
s390: Replace __ASSEMBLY__ with __ASSEMBLER__ in non-uapi headers
2025-06-16 16:23:02 +02:00
skey.h
s390/skey: Provide infrastructure for executing with non-default access key
2025-06-29 13:12:02 +02:00
smp.h
s390/smp: Mark pcpu_delegate() and smp_call_ipl_cpu() as __noreturn
2025-11-06 14:17:28 +01:00
softirq_stack.h
s390: Replace S390_lowcore by get_lowcore()
2024-06-18 17:01:33 +02:00
sparsemem.h
s390/sparsemem: Provide phys_to_target_node() with CONFIG_NUMA
2024-11-07 10:33:44 +01:00
spinlock_types.h
Improve consistency of '#error' directive messages
2024-11-11 17:17:04 -08:00
spinlock.h
s390: Remove superfluous newlines from inline assemblies
2025-09-29 13:52:08 +02:00
stackprotector.h
s390: Add stackprotector support
2025-11-24 11:45:21 +01:00
stacktrace.h
KVM: s390: vsie: Avoid injecting machine check on signal
2026-03-16 16:56:39 +01:00
stp.h
s390/time: Add PtP driver
2024-10-30 17:02:39 -07:00
string.h
s390/string: Remove strlcat() implementation
2026-05-30 11:37:25 +02:00
syscall_wrapper.h
s390: Remove compat support
2025-11-17 11:10:38 +01:00
syscall.h
s390: Remove compat support
2025-11-17 11:10:38 +01:00
sysinfo.h
s390/sysinfo: Move stsi() to header file
2025-03-04 17:18:07 +01:00
text-patching.h
s390: introduce text_poke_sync()
2021-10-11 20:55:58 +02:00
thread_info.h
s390: Remove compat support
2025-11-17 11:10:38 +01:00
timex.h
s390/timex: Move union tod_clock type to separate header
2026-06-15 16:33:40 +02:00
tlb.h
Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
2026-02-13 11:31:15 -08:00
tlbflush.h
s390/mm: Remove unused flush_tlb()
2025-11-14 11:34:27 +01:00
tod_types.h
s390/timex: Move union tod_clock type to separate header
2026-06-15 16:33:40 +02:00
topology.h
s390/smp: Add support for HOTPLUG_SMT
2025-03-31 12:20:39 +02:00
tpi.h
s390: Replace __ASSEMBLY__ with __ASSEMBLER__ in non-uapi headers
2025-06-16 16:23:02 +02:00
trace_clock.h
s390/tracing: Add s390-tod clock
2026-05-26 08:15:41 +02:00
types.h
s390: Replace __ASSEMBLY__ with __ASSEMBLER__ in non-uapi headers
2025-06-16 16:23:02 +02:00
uaccess.h
uaccess: unify inline vs outline copy_{from,to}_user() selection
2026-05-28 21:24:44 -07:00
unistd.h
s390/syscalls: Switch to generic system call table generation
2025-11-17 11:10:39 +01:00
unwind.h
s390/kprobes: replace kretprobe with rethook
2023-01-22 18:42:35 +01:00
uprobes.h
…
user.h
asm/user.h: killed unused macros
2022-01-30 21:17:00 -05:00
uv.h
KVM: s390: Switch to new gmap
2026-02-04 17:00:10 +01:00
vdso-symbols.h
s390/vdso: Rename vdso64 to vdso
2025-11-25 15:28:07 +01:00
vdso.h
s390: Replace __ASSEMBLY__ with __ASSEMBLER__ in non-uapi headers
2025-06-16 16:23:02 +02:00
vmalloc.h
…
vmlinux.lds.h
…
vtime.h
s390/irq/idle: Use stcke instead of stckf for time stamps
2026-06-15 16:33:40 +02:00
vtimer.h
s390: remove orphaned function declarations
2020-09-30 12:09:54 +02:00
word-at-a-time.h
s390: Revert support for DCACHE_WORD_ACCESS
2026-06-12 11:30:25 +02:00