zhong jiang 1730f14660 kexec: add restriction on kexec_load() segment sizes ... I hit the following issue when run trinity in my system. The kernel is 3.4 version, but mainline has the same issue. The root cause is that the segment size is too large so the kerenl spends too long trying to allocate a page. Other cases will block until the test case quits. Also, OOM conditions will occur. Call Trace: __alloc_pages_nodemask+0x14c/0x8f0 alloc_pages_current+0xaf/0x120 kimage_alloc_pages+0x10/0x60 kimage_alloc_control_pages+0x5d/0x270 machine_kexec_prepare+0xe5/0x6c0 ? kimage_free_page_list+0x52/0x70 sys_kexec_load+0x141/0x600 ? vfs_write+0x100/0x180 system_call_fastpath+0x16/0x1b The patch changes sanity_check_segment_list() to verify that the usage by all segments does not exceed half of memory. [akpm@linux-foundation.org: fix for kexec-return-error-number-directly.patch, update comment] Link: http://lkml.kernel.org/r/1469625474-53904-1-git-send-email-zhongjiang@huawei.com Signed-off-by: zhong jiang <zhongjiang@huawei.com> Suggested-by: Eric W. Biederman <ebiederm@xmission.com> Cc: Vivek Goyal <vgoyal@redhat.com> Cc: Dave Young <dyoung@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2016-08-02 19:35:31 -04:00
..
bpf	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2016-07-27 12:03:20 -07:00
configs
debug
events	Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2016-07-29 13:55:30 -07:00
gcov	gcov: add support for gcc version >= 6	2016-07-15 14:54:27 +09:00
irq	genirq: Fix missing irq allocation affinity hint	2016-07-19 10:49:47 +02:00
livepatch	Merge branches 'for-4.7/core', 'for-4.7/livepatching-doc' and 'for-4.7/livepatching-ppc64' into for-linus	2016-05-17 12:06:35 +02:00
locking	Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2016-07-25 12:41:29 -07:00
power	mm, vmscan: move LRU lists to node	2016-07-28 16:07:41 -07:00
printk	printk: add kernel parameter to control writes to /dev/kmsg	2016-08-02 19:35:06 -04:00
rcu	Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2016-07-29 13:55:30 -07:00
sched	xen: features and fixes for 4.8-rc0	2016-07-27 11:35:37 -07:00
time	Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2016-07-29 13:55:30 -07:00
trace	This is mostly clean ups and small fixes. Some of the more visible	2016-07-28 18:20:09 -07:00
.gitignore
acct.c
async.c
audit.c	Merge branch 'stable-4.8' of git://git.infradead.org/users/pcmoore/audit	2016-07-29 17:54:17 -07:00
audit.h	Merge branch 'stable-4.8' of git://git.infradead.org/users/pcmoore/audit	2016-07-29 17:54:17 -07:00
audit_fsnotify.c
audit_tree.c	audit: cleanup prune_tree_thread	2016-04-04 09:46:47 -04:00
audit_watch.c	don't bother with ->d_inode->i_sb - it's always equal to ->d_sb	2016-04-10 17:11:51 -04:00
auditfilter.c	audit: add fields to exclude filter by reusing user filter	2016-06-27 11:01:00 -04:00
auditsc.c	Merge branch 'stable-4.8' of git://git.infradead.org/users/pcmoore/audit	2016-07-29 17:54:17 -07:00
backtracetest.c
bounds.c
capability.c	kernel: Add noaudit variant of ns_capable()	2016-06-06 20:16:18 +10:00
cgroup.c	Merge branch 'for-4.7-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup	2016-07-29 14:29:04 -07:00
cgroup_freezer.c
cgroup_pids.c	cgroup: Use lld instead of ld when printing pids controller events_limit	2016-06-21 15:03:36 -04:00
compat.c
configs.c
context_tracking.c
cpu.c	timers/core: Correct callback order during CPU hot plug	2016-07-28 18:56:22 +02:00
cpu_pm.c
cpuset.c	cpuset, mm: fix TIF_MEMDIE check in cpuset_change_task_nodemask	2016-07-28 16:07:41 -07:00
crash_dump.c
cred.c	cred: Reject inodes with invalid ids in set_create_file_as()	2016-06-30 18:05:09 -05:00
delayacct.c
dma.c
elfcore.c
exec_domain.c
exit.c	kernel/exit.c: quieten greatest stack depth printk	2016-08-02 19:35:23 -04:00
extable.c
fork.c	mm: fix memcg stack accounting for sub-page stacks	2016-07-28 16:07:41 -07:00
freezer.c	freezer, oom: check TIF_MEMDIE on the correct task	2016-07-28 16:07:41 -07:00
futex.c	futex: Calculate the futex key based on a tail page for file-based futexes	2016-06-08 19:23:54 +02:00
futex_compat.c
groups.c
hung_task.c	kernel/hung_task.c: use timeout diff when timeout is updated	2016-03-22 15:36:02 -07:00
irq_work.c
jump_label.c	Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2016-07-25 12:41:29 -07:00
kallsyms.c
kcmp.c
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt
kcov.c	kernel/kcov: unproxify debugfs file's fops	2016-06-15 04:56:35 -07:00
kexec.c	kexec: allow architectures to override boot mapping	2016-08-02 19:35:27 -04:00
kexec_core.c	kexec: add restriction on kexec_load() segment sizes	2016-08-02 19:35:31 -04:00
kexec_file.c	kexec: introduce a protection mechanism for the crashkernel reserved memory	2016-05-23 17:04:14 -07:00
kexec_internal.h
kmod.c
kprobes.c
ksysfs.c	kexec: add a kexec_crash_loaded() function	2016-08-02 19:35:30 -04:00
kthread.c
latencytop.c
Makefile	ELF/MIPS build fix	2016-05-23 17:04:14 -07:00
membarrier.c
memremap.c	libnvdimm for 4.8	2016-07-28 17:38:16 -07:00
module-internal.h
module.c	dynamic_debug: only add header when used	2016-08-02 19:35:03 -04:00
module_signing.c	KEYS: Move the point of trust determination to __key_link()	2016-04-11 22:43:43 +01:00
notifier.c
nsproxy.c
padata.c	kernel/padata.c: hide unused functions	2016-05-19 19:12:14 -07:00
panic.c	kexec: use core_param for crash_kexec_post_notifiers boot option	2016-08-02 19:35:29 -04:00
params.c
pid.c	remove lots of IS_ERR_VALUE abuses	2016-05-27 15:26:11 -07:00
pid_namespace.c
profile.c	profile: Convert to hotplug state machine	2016-07-15 10:41:42 +02:00
ptrace.c	ptrace: change __ptrace_unlink() to clear ->ptrace under ->siglock	2016-03-22 15:36:02 -07:00
range.c
reboot.c
relay.c	kernel/relay.c: fix potential memory leak	2016-06-09 14:23:11 -07:00
resource.c	/proc/iomem: only expose physical resource addresses to privileged users	2016-04-14 12:56:09 -07:00
seccomp.c	seccomp: recheck the syscall after RET_TRACE	2016-06-14 10:54:41 -07:00
signal.c	signals: Use hrtimer for sigtimedwait()	2016-07-07 10:35:07 +02:00
smp.c	Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2016-07-29 13:55:30 -07:00
smpboot.c
smpboot.h
softirq.c	arch, ftrace: for KASAN put hard/soft IRQ entries into separate sections	2016-03-25 16:37:42 -07:00
stacktrace.c
stop_machine.c	stop_machine: Touch_nmi_watchdog() after MULTI_STOP_PREPARE	2016-07-27 11:12:11 +02:00
sys.c	prctl: make PR_SET_THP_DISABLE wait for mmap_sem killable	2016-05-23 17:04:14 -07:00
sys_ni.c
sysctl.c	printk: add kernel parameter to control writes to /dev/kmsg	2016-08-02 19:35:06 -04:00
sysctl_binary.c	kernel/sysctl_binary.c: use generic UUID library	2016-05-20 17:58:30 -07:00
task_work.c	task_work: use READ_ONCE/lockless_dereference, avoid pi_lock if !task_works	2016-08-02 19:35:02 -04:00
taskstats.c	taskstats: use the libnl API to align nlattr on 64-bit	2016-04-23 20:13:25 -04:00
test_kprobes.c
torture.c	torture: Stop onoff task if there is only one cpu	2016-06-14 16:03:28 -07:00
tracepoint.c	kernel/...: convert pr_warning to pr_warn	2016-03-22 15:36:02 -07:00
tsacct.c
uid16.c
up.c
user-return-notifier.c
user.c
user_namespace.c	fs: Limit file caps to the user namespace of the super block	2016-06-24 10:40:31 -05:00
utsname.c
utsname_sysctl.c
watchdog.c	Revert "perf/x86/intel, watchdog: Switch NMI watchdog to ref cycles on x86"	2016-07-10 20:58:36 +02:00
workqueue.c	Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2016-07-29 13:55:30 -07:00
workqueue_internal.h