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Pratyush Yadav 9aaf4c2b36 kho: warn and exit when unpreserved page wasn't preserved 
commit b05addf6f0 upstream.

Calling __kho_unpreserve() on a pair of (pfn, end_pfn) that wasn't
preserved is a bug.  Currently, if that is done, the physxa or bits can be
NULL.  This results in a soft lockup since a NULL physxa or bits results
in redoing the loop without ever making any progress.

Return when physxa or bits are not found, but WARN first to loudly
indicate invalid behaviour.

Link: https://lkml.kernel.org/r/20251103180235.71409-3-pratyush@kernel.org
Fixes: fc33e4b44b ("kexec: enable KHO support for memory preservation")
Signed-off-by: Pratyush Yadav <pratyush@kernel.org>
Reviewed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Cc: Alexander Graf <graf@amazon.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Pasha Tatashin <pasha.tatashin@soleen.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2025-11-24 10:37:42 +01:00
..
bpf
bpf: account for current allocated stack depth in widen_imprecise_scalars()
2025-11-24 10:37:36 +01:00
cgroup
bpf: Do not limit bpf_cgroup_from_id to current's namespace
2025-11-13 15:36:51 -05:00
configs
configs/hardening: Enable CONFIG_INIT_ON_FREE_DEFAULT_ON
2025-07-21 21:41:57 -07:00
debug
Merge tag 'tty-6.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
2025-04-02 18:17:33 -07:00
dma
dma-debug: don't report false positives with DMA_BOUNCE_UNALIGNED_KMALLOC
2025-10-29 14:10:21 +01:00
entry
Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
2025-07-30 17:14:01 -07:00
events
perf/core: Fix system hang caused by cpu-clock usage
2025-11-13 15:37:46 -05:00
futex
futex: Optimize per-cpu reference counting
2025-11-24 10:37:22 +01:00
gcov
gcov: add support for GCC 15
2025-11-24 10:37:41 +01:00
irq
genirq/manage: Add buslock back in to enable_irq()
2025-11-02 22:18:03 +09:00
kcsan
kcsan: test: Initialize dummy variable
2025-07-23 08:51:32 +02:00
livepatch
sched,livepatch: Untangle cond_resched() and live-patching
2025-05-14 13:16:24 +02:00
locking
Merge tag 'locking_urgent_for_v6.17_rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2025-08-17 05:57:47 -07:00
module
Merge tag 'mm-stable-2025-08-03-12-35' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2025-08-05 16:02:07 +03:00
power
PM: sleep: Allow pm_restrict_gfp_mask() stacking
2025-11-13 15:36:45 -05:00
printk
Merge tag 'printk-for-6.17' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux
2025-08-04 10:54:36 -07:00
rcu
srcu/tiny: Remove preempt_disable/enable() in srcu_gp_start_if_needed()
2025-10-15 12:03:58 +02:00
sched
sched_ext: Fix unsafe locking in the scx_dump_state()
2025-11-24 10:37:37 +01:00
time
posix-timers: Plug potential memory leak in do_timer_create()
2025-11-24 10:37:36 +01:00
trace
tracing: Fix memory leaks in create_field_var()
2025-11-13 15:37:45 -05:00
unwind
unwind: Finish up unwind when a task exits
2025-07-31 10:20:11 -04:00
.gitignore
kheaders: rebuild kheaders_data.tar.xz when a file is modified within a minute
2025-06-24 20:30:37 +09:00
acct.c
acct: block access to kernel internal filesystems
2025-02-12 12:24:16 +01:00
async.c
…
audit_fsnotify.c
…
audit_tree.c
replace collect_mounts()/drop_collected_mounts() with a safer variant
2025-06-23 14:01:49 -04:00
audit_watch.c
fs: add kern_path_locked_negative()
2025-04-15 11:32:34 +02:00
audit.c
audit: record AUDIT_ANOM_* events regardless of presence of rules
2025-04-11 14:14:41 -04:00
audit.h
audit,module: restore audit logging in load failure case
2025-06-16 17:00:06 -04:00
auditfilter.c
audit: fix out-of-bounds read in audit_compare_dname_path()
2025-09-03 16:46:23 -04:00
auditsc.c
audit,module: restore audit logging in load failure case
2025-06-16 17:00:06 -04:00
backtracetest.c
backtracetest: add MODULE_DESCRIPTION()
2024-06-24 22:24:55 -07:00
bounds.c
bounds: Use the right number of bits for power-of-two CONFIG_NR_CPUS
2024-04-29 08:29:29 -07:00
capability.c
capability: Remove unused has_capability
2025-03-07 22:03:09 -06:00
cfi.c
cfi: Move BPF CFI types and helpers to generic code
2025-07-31 18:23:53 -07:00
compat.c
…
configs.c
…
context_tracking.c
context_tracking: Make RCU watch ct_kernel_exit_state() warning
2025-03-04 18:44:29 -08:00
cpu_pm.c
…
cpu.c
cpu: Remove obsolete comment from takedown_cpu()
2025-08-06 22:48:12 +02:00
crash_core.c
kdump: wait for DMA to finish when using CMA
2025-07-19 19:08:23 -07:00
crash_dump_dm_crypt.c
crash_dump: retrieve dm crypt keys in kdump kernel
2025-05-21 10:48:21 -07:00
crash_reserve.c
kdump: implement reserve_crashkernel_cma
2025-07-19 19:08:23 -07:00
cred.c
cred: remove old {override,revert}_creds() helpers
2024-12-02 11:25:09 +01:00
delayacct.c
delayacct: remove redundant code and adjust indentation
2025-05-27 19:40:33 -07:00
dma.c
…
elfcorehdr.c
…
exec_domain.c
…
exit.c
Merge tag 'mm-nonmm-stable-2025-08-03-12-47' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2025-08-03 16:23:09 -07:00
exit.h
…
extable.c
…
fail_function.c
…
fork.c
copy_sighand: Handle architectures where sizeof(unsigned long) < sizeof(u64)
2025-10-19 16:37:24 +02:00
freezer.c
sched,freezer: Remove unnecessary warning in __thaw_task
2025-07-17 07:56:50 -10:00
gen_kheaders.sh
kheaders: make it possible to override TAR
2025-08-06 10:23:36 +09:00
groups.c
…
hung_task.c
hung_task: extend hung task blocker tracking to rwsems
2025-07-19 19:08:26 -07:00
iomem.c
mm/memremap: Pass down MEMREMAP_* flags to arch_memremap_wb()
2025-02-21 15:05:38 +01:00
irq_work.c
kasan: make kasan_record_aux_stack_noalloc() the default behaviour
2025-01-13 22:40:36 -08:00
jump_label.c
jump_label: Use RCU in all users of __module_text_address().
2025-03-10 11:54:46 +01:00
kallsyms_internal.h
kallsyms: get rid of code for absolute kallsyms
2024-07-20 16:33:21 +09:00
kallsyms_selftest.c
kallsyms: Use kthread_run_on_cpu()
2025-01-02 22:12:12 +01:00
kallsyms_selftest.h
…
kallsyms.c
bpf: Clean up individual BTF_ID code
2025-07-16 18:34:42 -07:00
kcmp.c
kcmp: improve performance adding an unlikely hint to task comparisons
2025-02-21 10:25:33 +01:00
Kconfig.freezer
…
Kconfig.hz
kernel: Fix "select" wording on HZ_250 description
2025-02-21 09:20:30 +01:00
Kconfig.kexec
kho: mm: don't allow deferred struct page with KHO
2025-08-19 16:35:53 -07:00
Kconfig.locks
…
Kconfig.preempt
sched: No PREEMPT_RT=y for all{yes,mod}config
2024-11-07 15:25:05 +01:00
kcov.c
kcov: fix typo in comment of kcov_fault_in_area
2025-07-09 22:57:52 -07:00
kexec_core.c
Merge tag 'mm-nonmm-stable-2025-08-03-12-47' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2025-08-03 16:23:09 -07:00
kexec_elf.c
kexec: initialize ELF lowest address to ULONG_MAX
2025-03-16 22:30:47 -07:00
kexec_file.c
Merge tag 'mm-nonmm-stable-2025-08-03-12-47' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2025-08-03 16:23:09 -07:00
kexec_handover.c
kho: warn and exit when unpreserved page wasn't preserved
2025-11-24 10:37:42 +01:00
kexec_internal.h
kexec: enable CMA based contiguous allocation
2025-08-02 12:01:38 -07:00
kexec.c
kexec: enable CMA based contiguous allocation
2025-08-02 12:01:38 -07:00
kheaders.c
kheaders: Simplify attribute through __BIN_ATTR_SIMPLE_RO()
2024-12-24 09:46:49 +01:00
kprobes.c
kprobes: Add missing kerneldoc for __get_insn_slot
2025-07-15 18:45:34 +09:00
kstack_erase.c
stackleak: Rename stackleak_track_stack to __sanitizer_cov_stack_depth
2025-07-21 21:40:39 -07:00
ksyms_common.c
…
ksysfs.c
kernel/ksysfs.c: simplify bin_attribute definition
2025-01-07 16:59:15 +01:00
kthread.c
ipvs: Fix estimator kthreads preferred affinity
2025-08-13 08:34:33 +02:00
latencytop.c
treewide: const qualify ctl_tables where applicable
2025-01-28 13:48:37 +01:00
Makefile
Merge tag 'kbuild-v6.17-2' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild
2025-08-06 07:32:52 +03:00
module_signature.c
…
notifier.c
reboot: move reboot_notifier_list to kernel/reboot.c
2024-11-05 17:12:31 -08:00
nsproxy.c
kernel/nsproxy: remove unnecessary guards
2025-05-09 13:13:54 +02:00
padata.c
padata: Reset next CPU when reorder sequence wraps around
2025-10-19 16:37:29 +02:00
panic.c
Merge tag 'mm-nonmm-stable-2025-08-03-12-47' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2025-08-03 16:23:09 -07:00
params.c
params: Replace deprecated strcpy() with strscpy() and memcpy()
2025-08-16 21:47:25 +02:00
pid_namespace.c
pid: Do not set pid_max in new pid namespaces
2025-03-06 10:18:36 +01:00
pid_sysctl.h
treewide: const qualify ctl_tables where applicable
2025-01-28 13:48:37 +01:00
pid.c
pid: Add a judgment for ns null in pid_nr_ns
2025-10-19 16:37:43 +02:00
profile.c
profiling: remove profile=sleep support
2024-08-04 13:36:28 -07:00
ptrace.c
ptrace: introduce PTRACE_SET_SYSCALL_INFO request
2025-05-11 17:48:15 -07:00
range.c
…
reboot.c
Merge tag 'mm-nonmm-stable-2025-03-30-18-23' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2025-04-01 10:06:52 -07:00
regset.c
regset: use kvzalloc() for regset_get_alloc()
2024-04-25 21:07:03 -07:00
relay.c
relayfs: support a counter tracking if data is too big to write
2025-07-09 22:57:52 -07:00
resource_kunit.c
resource, kunit: fix user-after-free in resource_test_region_intersects()
2024-10-09 12:47:19 -07:00
resource.c
resource: fix false warning in __request_region()
2025-07-24 17:57:59 -07:00
rseq.c
rseq: Protect event mask against membarrier IPI
2025-10-19 16:36:59 +02:00
scftorture.c
scftorture: Handle NULL argument passed to scf_add_to_free_list().
2024-11-14 16:09:51 -08:00
scs.c
…
seccomp.c
seccomp: passthrough uprobe systemcall without filtering
2025-11-02 22:18:03 +09:00
signal.c
signal: Fix memory leak for PIDFD_SELF* sentinels
2025-08-19 13:51:28 +02:00
smp.c
smp: Fix up and expand the smp_call_function_many() kerneldoc
2025-10-15 12:03:36 +02:00
smpboot.c
sched/smp: Use the SMP version of idle_thread_set_boot_cpu()
2025-06-13 08:47:20 +02:00
smpboot.h
…
softirq.c
lockdep: Fix wait context check on softirq for PREEMPT_RT
2025-03-25 10:46:44 +01:00
stacktrace.c
…
static_call_inline.c
Merge tag 'modules-6.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/modules/linux
2025-03-30 15:44:36 -07:00
static_call.c
…
stop_machine.c
sched/core: Fix migrate_swap() vs. hotplug
2025-07-01 15:02:03 +02:00
sys_ni.c
Merge tag 'probes-v6.11' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace
2024-07-18 12:19:20 -07:00
sys.c
kernel/sys.c: fix the racy usage of task_lock(tsk->group_leader) in sys_prlimit64() paths
2025-10-19 16:37:28 +02:00
sysctl-test.c
sysctl: move u8 register test to lib/test_sysctl.c
2025-04-14 14:13:41 +02:00
sysctl.c
sysctl: rename kern_table -> sysctl_subsys_table
2025-07-23 11:56:02 +02:00
task_work.c
kasan: make kasan_record_aux_stack_noalloc() the default behaviour
2025-01-13 22:40:36 -08:00
taskstats.c
fdget(), more trivial conversions
2024-11-03 01:28:06 -05:00
torture.c
torture: Add get_torture_init_jiffies() for test-start time
2025-02-05 07:14:24 -08:00
tracepoint.c
tracepoint: Print the function symbol when tracepoint_debug is set
2025-03-21 15:30:10 -04:00
tsacct.c
tsacct: replace strncpy() with strscpy()
2024-07-12 16:39:53 -07:00
ucount.c
ucount: use atomic_long_try_cmpxchg() in atomic_long_inc_below()
2025-08-02 12:01:38 -07:00
uid16.c
…
uid16.h
…
umh.c
treewide: const qualify ctl_tables where applicable
2025-01-28 13:48:37 +01:00
up.c
…
user_namespace.c
uidgid: add map_id_range_up()
2025-02-12 12:12:27 +01:00
user-return-notifier.c
…
user.c
uidgid: make sure we fit into one cacheline
2024-09-12 12:16:09 +02:00
utsname_sysctl.c
treewide: const qualify ctl_tables where applicable
2025-01-28 13:48:37 +01:00
utsname.c
…
vhost_task.c
vhost: Take a reference on the task in struct vhost_task.
2025-09-21 17:44:20 -04:00
vmcore_info.c
crash: export PAGE_UNACCEPTED_MAPCOUNT_VALUE to vmcoreinfo
2025-05-11 17:54:04 -07:00
watch_queue.c
Merge tag 'vfs-6.15-rc1.pipe' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2025-03-24 09:52:37 -07:00
watchdog_buddy.c
watchdog: fix opencoded cpumask_next_wrap() in watchdog_next_cpu()
2025-07-31 11:28:03 -04:00
watchdog_perf.c
watchdog/perf: Provide function for adjusting the event period
2025-07-04 13:17:30 +01:00
watchdog.c
kernel/watchdog: add /sys/kernel/{hard,soft}lockup_count
2025-05-21 10:48:22 -07:00
workqueue_internal.h
…
workqueue.c
Merge tag 'wq-for-6.17' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq
2025-07-31 15:40:22 -07:00