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Sourabh Jain 7b9d5f73e7 kexec: initialize ELF lowest address to ULONG_MAX 
[ Upstream commit 9986fb5164c8b21f6439cfd45ba36d8cc80c9710 ]

Patch series "powerpc/crash: use generic crashkernel reservation", v3.

Commit 0ab97169aa05 ("crash_core: add generic function to do reservation")
added a generic function to reserve crashkernel memory.  So let's use the
same function on powerpc and remove the architecture-specific code that
essentially does the same thing.

The generic crashkernel reservation also provides a way to split the
crashkernel reservation into high and low memory reservations, which can
be enabled for powerpc in the future.

Additionally move powerpc to use generic APIs to locate memory hole for
kexec segments while loading kdump kernel.

This patch (of 7):

kexec_elf_load() loads an ELF executable and sets the address of the
lowest PT_LOAD section to the address held by the lowest_load_addr
function argument.

To determine the lowest PT_LOAD address, a local variable lowest_addr
(type unsigned long) is initialized to UINT_MAX.  After loading each
PT_LOAD, its address is compared to lowest_addr.  If a loaded PT_LOAD
address is lower, lowest_addr is updated.  However, setting lowest_addr to
UINT_MAX won't work when the kernel image is loaded above 4G, as the
returned lowest PT_LOAD address would be invalid.  This is resolved by
initializing lowest_addr to ULONG_MAX instead.

This issue was discovered while implementing crashkernel high/low
reservation on the PowerPC architecture.

Link: https://lkml.kernel.org/r/20250131113830.925179-1-sourabhjain@linux.ibm.com
Link: https://lkml.kernel.org/r/20250131113830.925179-2-sourabhjain@linux.ibm.com
Fixes: a0458284f0 ("powerpc: Add support code for kexec_file_load()")
Signed-off-by: Sourabh Jain <sourabhjain@linux.ibm.com>
Acked-by: Hari Bathini <hbathini@linux.ibm.com>
Acked-by: Baoquan He <bhe@redhat.com>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Mahesh Salgaonkar <mahesh@linux.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2025-04-10 14:33:36 +02:00
..
bpf bpf: skip non exist keys in generic_map_lookup_batch 2025-03-07 16:56:38 +01:00
cgroup cgroup: fix race between fork and cgroup.kill 2025-02-21 13:50:04 +01:00
configs
debug kdb: Do not assume write() callback available 2025-02-21 13:50:09 +01:00
dma dma-debug: fix a possible deadlock on radix_lock 2024-12-14 19:54:43 +01:00
entry entry: Respect changes to system call number by trace_sys_enter() 2024-04-03 15:19:44 +02:00
events perf/ring_buffer: Allow the EPOLLRDNORM flag for poll 2025-04-10 14:33:31 +02:00
futex futex: Don't include process MM in futex key on no-MMU 2023-11-20 11:51:50 +01:00
gcov gcov: add support for GCC 14 2024-06-27 13:46:22 +02:00
irq genirq: Make handle_enforce_irqctx() unconditionally available 2025-02-21 13:48:57 +01:00
kcsan kcsan: Turn report_filterlist_lock into a raw_spinlock 2024-12-14 19:54:38 +01:00
livepatch livepatch: Fix missing newline character in klp_resolve_symbols() 2023-11-20 11:52:10 +01:00
locking lockdep: fix deadlock issue between lockdep and rcu 2024-10-17 15:21:27 +02:00
module module: Fix KCOV-ignored file name 2024-10-17 15:21:27 +02:00
power PM: hibernate: Add error handling for syscore_suspend() 2025-02-21 13:49:22 +01:00
printk printk: Fix signed integer overflow when defining LOG_BUF_LEN_MAX 2025-02-21 13:49:30 +01:00
rcu Revert "rcu-tasks: Fix access non-existent percpu rtpcp variable in rcu_tasks_need_gpcb()" 2025-01-02 10:30:55 +01:00
sched sched: Clarify wake_up_q()'s write to task->wake_q.next 2025-03-28 21:58:51 +01:00
time hrtimers: Mark is_migration_base() with __always_inline 2025-03-28 21:58:50 +01:00
trace bpf: Use preempt_count() directly in bpf_send_signal_common() 2025-04-10 14:33:34 +02:00
.gitignore
acct.c acct: block access to kernel internal filesystems 2025-03-07 16:56:39 +01:00
async.c async: Introduce async_schedule_dev_nocall() 2024-01-31 16:17:00 -08:00
audit_fsnotify.c audit: fix potential double free on error path from fsnotify_add_inode_mark 2022-08-22 18:50:06 -04:00
audit_tree.c
audit_watch.c audit: don't WARN_ON_ONCE(!current->mm) in audit_exe_compare() 2023-11-28 17:07:08 +00:00
audit.c audit: Send netlink ACK before setting connection in auditd_set 2024-02-05 20:12:47 +00:00
audit.h
auditfilter.c ima: Avoid blocking in RCU read-side critical section 2024-07-11 12:47:16 +02:00
auditsc.c audit,io_uring: io_uring openat triggers audit reference count underflow 2023-10-25 12:03:04 +02:00
backtracetest.c
bounds.c bounds: Use the right number of bits for power-of-two CONFIG_NR_CPUS 2024-05-02 16:29:32 +02:00
capability.c
cfi.c
compat.c sched_getaffinity: don't assume 'cpumask_size()' is fully initialized 2023-04-06 12:10:40 +02:00
configs.c
context_tracking.c
cpu_pm.c
cpu.c hrtimers: Handle CPU state correctly on hotplug 2025-01-23 17:17:15 +01:00
crash_core.c vmcoreinfo: add kallsyms_num_syms symbol 2022-08-28 14:02:44 -07:00
crash_dump.c
cred.c cred: switch to using atomic_long_t 2023-12-20 17:00:20 +01:00
delayacct.c
dma.c
exec_domain.c
exit.c mm: optimize the redundant loop of mm_update_owner_next() 2024-07-11 12:47:13 +02:00
extable.c
fail_function.c
fork.c posix-cpu-timers: Clear TICK_DEP_BIT_POSIX_TIMER on clone 2024-11-14 13:15:16 +01:00
freezer.c
gen_kheaders.sh kheaders: Ignore silly-rename files 2025-01-23 17:17:11 +01:00
groups.c security: Add LSM hook to setgroups() syscall 2022-07-15 18:21:49 +00:00
hung_task.c sched: Fix more TASK_state comparisons 2022-09-30 16:50:39 +02:00
iomem.c mm/nvdimm: add is_ioremap_addr and use that to check ioremap address 2019-07-12 11:05:40 -07:00
irq_work.c
jump_label.c jump_label: Fix static_key_slow_dec() yet again 2024-10-17 15:21:29 +02:00
kallsyms_internal.h kallsyms: Reduce the memory occupied by kallsyms_seqs_of_names[] 2023-10-25 12:03:16 +02:00
kallsyms.c kallsyms: Add helper kallsyms_on_each_match_symbol() 2023-10-25 12:03:16 +02:00
kcmp.c Merge branch 'exec-update-lock-for-v5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2020-12-15 19:36:48 -08:00
Kconfig.freezer
Kconfig.hz treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
Kconfig.locks
Kconfig.preempt
kcov.c kcov: mark in_softirq_really() as __always_inline 2025-01-09 13:30:05 +01:00
kexec_core.c kexec: fix a memory leak in crash_shrink_memory() 2023-07-19 16:21:08 +02:00
kexec_elf.c kexec: initialize ELF lowest address to ULONG_MAX 2025-04-10 14:33:36 +02:00
kexec_file.c kexec: support purgatories with .text.hot sections 2023-06-21 16:00:55 +02:00
kexec_internal.h
kexec.c kernel: kexec: copy user-array safely 2023-11-28 17:06:57 +00:00
kheaders.c kheaders: Use array declaration instead of char 2023-05-11 23:03:02 +09:00
kmod.c
kprobes.c kprobes: Fix to check symbol prefixes correctly 2024-08-14 13:52:54 +02:00
ksysfs.c
kthread.c kthread: unpark only parked kthread 2024-10-17 15:22:28 +02:00
latencytop.c
Makefile kernel/numa.c: Move logging out of numa.h 2024-06-12 11:03:16 +02:00
module_signature.c
notifier.c
nsproxy.c
numa.c kernel/numa.c: Move logging out of numa.h 2024-06-12 11:03:16 +02:00
padata.c padata: avoid UAF for reorder_work 2025-02-21 13:49:09 +01:00
panic.c panic: Flush kernel log buffer at the end 2024-04-13 13:04:54 +02:00
params.c kobject: remove kset from struct kset_uevent_ops callbacks 2021-12-28 11:26:18 +01:00
pid_namespace.c pid: Replace struct pid 1-element array with flex-array 2024-08-29 17:30:18 +02:00
pid.c pid: Replace struct pid 1-element array with flex-array 2024-08-29 17:30:18 +02:00
profile.c profiling: remove profile=sleep support 2024-08-14 13:52:50 +02:00
ptrace.c freezer,sched: Rewrite core freezer logic 2022-09-07 21:53:50 +02:00
range.c
reboot.c kernel/reboot: emergency_restart: Set correct system_state 2023-11-28 17:07:13 +00:00
regset.c
relay.c relayfs: fix out-of-bounds access in relay_file_read 2023-05-11 23:03:03 +09:00
resource_kunit.c
resource.c resource: fix region_intersects() vs add_memory_driver_managed() 2024-10-17 15:21:55 +02:00
rseq.c
scftorture.c scftorture: Forgive memory-allocation failure if KASAN 2023-09-23 11:11:00 +02:00
scs.c kasan, vmalloc: only tag normal vmalloc allocations 2022-03-24 19:06:48 -07:00
seccomp.c seccomp: Add wait_killable semantic to seccomp user notifier 2022-05-03 14:11:58 -07:00
signal.c signal: restore the override_rlimit logic 2024-11-14 13:15:18 +01:00
smp.c smp: Add missing destroy_work_on_stack() call in smp_call_on_cpu() 2024-09-12 11:10:24 +02:00
smpboot.c
smpboot.h
softirq.c softirq: Allow raising SCHED_SOFTIRQ from SMP-call-function on RT kernel 2025-02-01 18:30:06 +01:00
stackleak.c stackleak: add on/off stack variants 2022-05-08 01:33:09 -07:00
stacktrace.c uaccess: remove CONFIG_SET_FS 2022-02-25 09:36:06 +01:00
static_call_inline.c x86/static-call: provide a way to do very early static-call updates 2024-12-19 18:08:58 +01:00
static_call.c static_call: Don't make __static_call_return0 static 2022-04-05 09:59:38 +02:00
stop_machine.c
sys_ni.c syscalls: fix compat_sys_io_pgetevents_time64 usage 2024-07-05 09:31:59 +02:00
sys.c hrtimer: Use and report correct timerslack values for realtime tasks 2025-03-28 21:58:48 +01:00
sysctl-test.c
sysctl.c proc: proc_skip_spaces() shouldn't think it is working on C strings 2022-12-05 12:09:06 -08:00
task_work.c task_work: Introduce task_work_cancel() again 2024-08-03 08:49:34 +02:00
taskstats.c
torture.c
tracepoint.c tracepoint: Optimize the critical region of mutex_lock in tracepoint_module_coming() 2022-09-26 13:01:18 -04:00
tsacct.c taskstats: version 12 with thread group and exe info 2022-04-29 14:38:03 -07:00
ucount.c ucounts: fix counter leak in inc_rlimit_get_ucounts() 2024-11-14 13:15:19 +01:00
uid16.c
uid16.h
umh.c freezer,umh: Fix call_usermode_helper_exec() vs SIGKILL 2023-02-22 12:59:50 +01:00
up.c A set of locking related fixes and updates: 2021-05-09 13:07:03 -07:00
user_namespace.c ucounts: Split rlimit and ucount values and max values 2022-10-09 16:24:05 -07:00
user-return-notifier.c
user.c
usermode_driver.c
utsname_sysctl.c
utsname.c
watch_queue.c watch_queue: fix pipe accounting mismatch 2025-04-10 14:33:30 +02:00
watchdog_hld.c watchdog/perf: properly initialize the turbo mode timestamp and rearm counter 2024-08-03 08:49:42 +02:00
watchdog.c watchdog: move softlockup_panic back to early_param 2023-11-28 17:07:09 +00:00
workqueue_internal.h
workqueue.c workqueue: Improve scalability of workqueue watchdog touch 2024-09-12 11:10:27 +02:00