Rafael J. Wysocki cdd192a20b ACPI: tables: x86: Reserve memory occupied by ACPI tables ... commit 1a1c130ab7575498eed5bcf7220037ae09cd1f8a upstream. The following problem has been reported by George Kennedy: Since commit 7fef431be9 ("mm/page_alloc: place pages to tail in __free_pages_core()") the following use after free occurs intermittently when ACPI tables are accessed. BUG: KASAN: use-after-free in ibft_init+0x134/0xc49 Read of size 4 at addr ffff8880be453004 by task swapper/0/1 CPU: 3 PID: 1 Comm: swapper/0 Not tainted 5.12.0-rc1-7a7fd0d #1 Call Trace: dump_stack+0xf6/0x158 print_address_description.constprop.9+0x41/0x60 kasan_report.cold.14+0x7b/0xd4 __asan_report_load_n_noabort+0xf/0x20 ibft_init+0x134/0xc49 do_one_initcall+0xc4/0x3e0 kernel_init_freeable+0x5af/0x66b kernel_init+0x16/0x1d0 ret_from_fork+0x22/0x30 ACPI tables mapped via kmap() do not have their mapped pages reserved and the pages can be "stolen" by the buddy allocator. Apparently, on the affected system, the ACPI table in question is not located in "reserved" memory, like ACPI NVS or ACPI Data, that will not be used by the buddy allocator, so the memory occupied by that table has to be explicitly reserved to prevent the buddy allocator from using it. In order to address this problem, rearrange the initialization of the ACPI tables on x86 to locate the initial tables earlier and reserve the memory occupied by them. The other architectures using ACPI should not be affected by this change. Link: https://lore.kernel.org/linux-acpi/1614802160-29362-1-git-send-email-george.kennedy@oracle.com/ Reported-by: George Kennedy <george.kennedy@oracle.com> Tested-by: George Kennedy <george.kennedy@oracle.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Reviewed-by: Mike Rapoport <rppt@linux.ibm.com> Cc: 5.10+ <stable@vger.kernel.org> # 5.10+ Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2021-04-07 15:00:08 +02:00
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acpi	ACPI: scan: Use unique number for instance_no	2021-03-30 14:32:06 +02:00
asm-generic	static_call: Allow module use without exposing static_call_key	2021-03-30 14:31:53 +02:00
clocksource
crypto
drm
dt-bindings
keys
kunit
kvm
linux	ACPI: tables: x86: Reserve memory occupied by ACPI tables	2021-04-07 15:00:08 +02:00
math-emu
media
memory
misc
net	can: dev: Move device back to init netns on owning netns delete	2021-03-30 14:32:08 +02:00
pcmcia
ras
rdma
scsi	scsi: libsas: Introduce a _gfp() variant of event notifiers	2021-03-25 09:04:11 +01:00
soc
sound
target
trace
uapi	psample: Fix user API breakage	2021-03-30 14:31:53 +02:00
vdso
video
xen