Pull RISC-V fixes from Paul Walmsley:
- Fix swiotlb initialization on systems where DRAM is located above
4GiB (such as the Tenstorrent Blackhole cards)
- Fix an out-of-bounds access in the memory hot-remove code that can
occur on Sv39 and Sv48 systems
- Avoid oopsing during boot if the SBI component of the unaligned
access performance checking code loses a race against __init function
freeing
- Avoid attempting to install the debug-enabled vDSO when it shouldn't
be built due to !CONFIG_MMU
- Avoid some sparse warnings by adding missing __iomem notations in
get_cycles{,_hi}()
- Drop an unnecessary runtime warning in the SiFive errata handler
* tag 'riscv-for-linus-7.2-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux:
riscv: vdso: Only try to install vDSO when present
riscv: mm: Fix out-of-bounds page-table walk during memory hot-remove
riscv: drop __init from vec_check_unaligned_access_speed_all_cpus
riscv: mm: fix SWIOTLB initialization for systems with DRAM above 4GB
riscv/sifive: remove warning in errata
riscv: time: Add missing __iomem in get_cycles() and get_cycles_hi()
Pull s390 updates from Vasily Gorbik: - Fix PCI MMIO write syscall falsely reporting success for mappings not valid for MMIO when MIO is unavailable by returning -EFAULT - Fix CPRB parameter buffer overflows in zcrypt CCA AES cipher and ECC private key conversion by rejecting oversized key tokens - Fix buffer overreads and length underflow in pkey and zcrypt CCA token validation by checking length fields against actual buffer sizes - Fix out of bounds permission bitmap access in zcrypt EP11 admin CPRB filtering on custom device nodes by using AP_DOMAINS as the limit - Fix speculative permission bitmap reads in zcrypt CCA and EP11 admin CPRB handling by sanitizing user controlled domain indexes - Fix sensitive key material left in zcrypt CCA clear key import buffers by scrubbing CPRB and temporary buffers after use * tag 's390-7.2-6' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: s390/zcrypt: Fix missing mem scrub at clear key import in cca_clr2cipherkey() s390/zcrypt: Close speculative mem read possibility s390/zcrypt: Fix wrong domain value verification with EP11 CPRBs s390/zcrypt: Fix buffer over-read in cca_cipher2protkey s390/zcrypt: Validate length for CCA ECC private key requests s390/zcrypt: Validate length for CCA AES cipher key requests s390/pci: Fix s390_pci_mmio_write syscall error return without MIO
Pull misc x86 fixes from Ingo Molnar: - Fix the boot-time memcmp() asm implementation's constraints and optimization properties (Mauricio Faria de Oliveira) - Move the 0xd0...0xd7 AMD Zen5 model range from the Zen6 range where it mistakenly ended up (Pratik Vishwakarma) * tag 'x86-urgent-2026-08-02' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/CPU/AMD: Carve out a Zen5 models range x86/boot: Add volatile, clobbers and zero-length test in memcmp()
Pull UML fix from Richard Weinberger: - Fix use-after-free in UML's vector networking driver * tag 'uml-for-linus-7.2-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/uml/linux: um: vector: fix use-after-free in vector_mmsg_rx()
Pull misc fixes from Andrew Morton: "12 hotfixes. 6 are cc:stable. 9 are for MM. There's a two-patch series from Nico which fixes a couple of PMD level mTHP accounting bugs and a two-patch series from Chris Gellermann which addresses mishandling of getline() in selftests. All the remainder are singletons - please see the changelogs for details" * tag 'mm-hotfixes-stable-2026-07-30-19-30' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: selftests/mm: fix potential wild pointer access of getline due to missing init selftests/clone3: fix wild pointer access of getline due to missing init mm/page_reporting: use system_freezable_wq to fix UAF during suspend mm: vmscan: abort proactive reclaim early when freezing for suspend MAINTAINERS: update Nico Pache's email address arm64, mailmap: update email address for Peter Collingbourne MAINTAINERS: update address for Burak Emir mm/huge_memory: unlock i_mmap_rwsem before releasing after-split folios riscv/mm: use physical alignment for vmemmap_start_pfn mm/migrate: exclude hugetlb folios from MTHP_STAT_NR_ANON accounting mm: decrement MTHP_STAT_NR_ANON in free_zone_device_folio() mm: memcg: initialize *locked in memcg1_oom_prepare() stub
On a machine without PCI memory-I/O (MIO) support or when running with
pci=nomio the s390 specific PCI MMIO write syscall checks if the MMIO
cookie is above ZPCI_IOMAP_ADDR_BASE as a sanity check before even
trying to perform the MMIO. If this check fails the return value was
left unchanged and thus 0 from prior operations falsely indicating
success. This could potentially confuse user-space into falsely
believing the MMIO, on a mapping not valid for MMIO was successful.
Fix this by setting the return value to -EFAULT prior to the check
following the same pattern as elsewhere in the same function.
Cc: stable@vger.kernel.org
Reviewed-by: Julian Ruess <julianr@linux.ibm.com>
Reviewed-by: Farhan Ali <alifm@linux.ibm.com>
Fixes: a67a88b0b8de ("s390/pci: remove races against pte updates")
Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Pull powerpc fixes from Madhavan Srinivasan: - ensure vpa,slb_shadow & dtl are unregistered during crash - fix nap return address corruption on async interrupt exit in 970 platform - fix exit_flags field placement in pt_regs for ptrace - fix map failure path in dma_ioc0_map_pages() in ps3 platfrom - MAINTAINERS: Michael Ellerman demotes himself to reviewer - misc fixes and cleanup Thanks to Amit Machhiwal, Andreas Schwab, Anushree Mathur, Athira Rajeev, Christophe Leroy (CS GROUP), Dmitry V. Levin, Geert Uytterhoeven, John Ogness, Michael Ellerman, Mukesh Kumar Chaurasiya (IBM), Ritesh Harjani (IBM), Thorsten Blum, and Vaibhav Jain * tag 'powerpc-7.2-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: MAINTAINERS: Demote myself to reviewer powerpc/serial: Fix include guard comment powerpc/perf: Use strstarts() to simplify is_thread_imc_pmu() powerpc/ps3: Fix map failure path in dma_ioc0_map_pages() powerpc/ps3: Remove unused struct table in setup_areas() powerpc/boot: Fix treeboot-akebono CPU node lookup check powerpc/boot: Fix treeboot-currituck CPU node lookup check powerpc/boot: Fix simpleboot CPU node lookup check powerpc: Fix exit_flags field placement in pt_regs for ptrace powerpc/970: fix nap return address corruption on async interrupt exit powerpc/pseries: Skip vpa_init() for boot cpu in smp_setup_cpu() powerpc/pseries: Ensure vpa,slb_shadow & dtl are unregistered during crash
vdso.so.dbg is only built with CONFIG_MMU.
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202607090258.iSAUYlO1-lkp@intel.com/
Fixes: f157d411a9eb ("riscv: add missing vdso_install target")
Fixes: 3edf39916977 ("vDSO, kbuild: Provide vDSO debug variants at runtime")
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Link: https://patch.msgid.link/20260709-riscv-install-vdso-v1-1-0ba4345419ca@linutronix.de
Signed-off-by: Paul Walmsley <pjw@kernel.org>
remove_pud_mapping() and remove_p4d_mapping() obtain a child table base
with pud_offset(p4dp, 0) and p4d_offset(pgd, 0), then add the index for
addr.
RISC-V folds page-table levels at runtime. When a level is folded, its
offset helper returns the parent entry itself, but the index can still be
nonzero. Adding it walks past the parent table. Sv48 folds P4D, while Sv39
folds both P4D and PUD, so memory hot-remove can descend into unrelated
memory and pass an invalid page to __free_pages(). This can trigger:
kernel BUG at include/linux/mm.h:1810!
VM_BUG_ON_PAGE(page_ref_count(page) == 0)
arch_remove_memory+0x1e/0x5c
try_remove_memory+0x15e/0x200
remove_memory+0x24/0x3c
Only add the index when the corresponding page-table level is enabled,
matching p4d_offset() and pud_offset().
Fixes: c75a74f4ba19 ("riscv: mm: Add memory hotplugging support")
Assisted-by: Claude:claude-fable-5
Signed-off-by: Karl Mehltretter <kmehltretter@gmail.com>
Link: https://patch.msgid.link/20260729012132.24882-1-kmehltretter@gmail.com
Signed-off-by: Paul Walmsley <pjw@kernel.org>
Always update x2APIC MSR intercepts for L1 when AVIC is deactivated, even
if L2 is active and KVM is using a separate MSR bitmap to run L2. If AVIC
is fully enabled prior to running L2, and is then inhibited while L2 is
active (for a VM-scoped inhibit), then KVM will run L1 with AVIC disabled,
but with x2APIC MSR intercepts disabled, i.e. will allow L1 to read most of
the host's APIC state, send arbitrary interrupts, change task priority, and
ultimately trivially DoS the host.
E.g. sending a self-IPI in L1 on HYPERV_REENLIGHTENMENT_VECTOR, 0xee, with
CONFIG_HYPERV=n in the host kernel as a "safe" PoC, yields:
Spurious interrupt (vector 0xee) on CPU#425. Acked
And hacking KVM to abuse kvm_set_posted_intr_wakeup_handler() to register a
handler and WARN on POSTED_INTR_WAKEUP_VECTOR yields:
------------[ cut here ]------------
WARNING: arch/x86/kvm/svm/svm.c:5594 at pi_wakeup_handler+0x9/0x10 [kvm_amd], CPU#156: nested_x2apic_t/316940
CPU: 156 UID: 0 PID: 316940 Comm: nested_x2apic_t Tainted: G S U
Tainted: [S]=CPU_OUT_OF_SPEC, [U]=USER
Hardware name: Google Astoria-Turin/astoria, BIOS 0.20260209.0-0 02/09/2026
RIP: 0010:pi_wakeup_handler+0x9/0x10 [kvm_amd]
Call Trace:
<IRQ>
sysvec_kvm_posted_intr_wakeup_ipi+0x64/0x80
</IRQ>
<TASK>
asm_sysvec_kvm_posted_intr_wakeup_ipi+0x1a/0x20
RIP: 0010:vcpu_run+0x1430/0x1e40 [kvm]
kvm_arch_vcpu_ioctl_run+0x2c1/0x600 [kvm]
kvm_vcpu_ioctl+0x580/0x6b0 [kvm]
__se_sys_ioctl+0x6d/0xb0
do_syscall_64+0x10a/0x480
entry_SYSCALL_64_after_hwframe+0x4b/0x53
RIP: 0033:0x46ff4b
</TASK>
---[ end trace 0000000000000000 ]---
Fixes: 091abbf578f9 ("KVM: x86: nSVM: optimize svm_set_x2apic_msr_interception")
Cc: stable@vger.kernel.org
Cc: Yosry Ahmed <yosry@kernel.org>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Link: https://patch.msgid.link/20260729213558.639074-1-pbonzini@redhat.com/
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>