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Yongqiang Liu 0c027c2bad ARM: 9359/1: flush: check if the folio is reserved for no-mapping addresses 
[ Upstream commit 0c66c6f4e2 ]

Since commit a4d5613c4d ("arm: extend pfn_valid to take into account
freed memory map alignment") changes the semantics of pfn_valid() to check
presence of the memory map for a PFN. A valid page for an address which
is reserved but not mapped by the kernel[1], the system crashed during
some uio test with the following memory layout:

 node   0: [mem 0x00000000c0a00000-0x00000000cc8fffff]
 node   0: [mem 0x00000000d0000000-0x00000000da1fffff]
 the uio layout is：0xc0900000, 0x100000

the crash backtrace like:

  Unable to handle kernel paging request at virtual address bff00000
  [...]
  CPU: 1 PID: 465 Comm: startapp.bin Tainted: G           O      5.10.0 #1
  Hardware name: Generic DT based system
  PC is at b15_flush_kern_dcache_area+0x24/0x3c
  LR is at __sync_icache_dcache+0x6c/0x98
  [...]
   (b15_flush_kern_dcache_area) from (__sync_icache_dcache+0x6c/0x98)
   (__sync_icache_dcache) from (set_pte_at+0x28/0x54)
   (set_pte_at) from (remap_pfn_range+0x1a0/0x274)
   (remap_pfn_range) from (uio_mmap+0x184/0x1b8 [uio])
   (uio_mmap [uio]) from (__mmap_region+0x264/0x5f4)
   (__mmap_region) from (__do_mmap_mm+0x3ec/0x440)
   (__do_mmap_mm) from (do_mmap+0x50/0x58)
   (do_mmap) from (vm_mmap_pgoff+0xfc/0x188)
   (vm_mmap_pgoff) from (ksys_mmap_pgoff+0xac/0xc4)
   (ksys_mmap_pgoff) from (ret_fast_syscall+0x0/0x5c)
  Code: e0801001 e2423001 e1c00003 f57ff04f (ee070f3e)
  ---[ end trace 09cf0734c3805d52 ]---
  Kernel panic - not syncing: Fatal exception

So check if PG_reserved was set to solve this issue.

[1]: https://lore.kernel.org/lkml/Zbtdue57RO0QScJM@linux.ibm.com/

Fixes: a4d5613c4d ("arm: extend pfn_valid to take into account freed memory map alignment")
Suggested-by: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Yongqiang Liu <liuyongqiang13@huawei.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
 		2024-04-03 15:28:50 +02:00
..
Kconfig arm: update in-source documentation references 2023-06-12 06:33:48 -06:00
Makefile ARM: 9263/1: use .arch directives instead of assembler command line flags 2022-11-08 18:36:17 +00:00
abort-ev4.S
…
abort-ev4t.S
…
abort-ev5t.S
…
abort-ev5tj.S
…
abort-ev6.S ARM: 9263/1: use .arch directives instead of assembler command line flags 2022-11-08 18:36:17 +00:00
abort-ev7.S ARM: 9263/1: use .arch directives instead of assembler command line flags 2022-11-08 18:36:17 +00:00
abort-lv4t.S
…
abort-macro.S
…
abort-nommu.S
…
alignment.c ARM: 9214/1: alignment: advance IT state after emulating Thumb instruction 2022-07-06 22:44:49 +01:00
cache-b15-rac.c ARM: mm: fix typos in comments 2022-04-04 10:18:54 -07:00
cache-fa.S ARM: mm: Make virt_to_pfn() a static inline 2023-05-29 11:27:08 +02:00
cache-feroceon-l2.c treewide: Replace GPLv2 boilerplate/reference with SPDX - gpl-2.0_56.RULE (part 1) 2022-06-10 14:51:35 +02:00
cache-l2x0-pmu.c
…
cache-l2x0.c ARM: 9007/1: l2c: fix prefetch bits init in L2X0_AUX_CTRL using DT values 2020-09-15 14:35:53 +01:00
cache-nop.S
…
cache-tauros2.c treewide: Replace GPLv2 boilerplate/reference with SPDX - gpl-2.0_56.RULE (part 1) 2022-06-10 14:51:35 +02:00
cache-tauros3.h
…
cache-uniphier.c ARM: uniphier: fix cache kernel-doc warnings 2023-09-27 11:02:14 +02:00
cache-v4.S
…
cache-v4wb.S ARM: mm: Make virt_to_pfn() a static inline 2023-05-29 11:27:08 +02:00
cache-v4wt.S
…
cache-v6.S ARM: 9263/1: use .arch directives instead of assembler command line flags 2022-11-08 18:36:17 +00:00
cache-v7.S ARM: 9263/1: use .arch directives instead of assembler command line flags 2022-11-08 18:36:17 +00:00
cache-v7m.S ARM: 9263/1: use .arch directives instead of assembler command line flags 2022-11-08 18:36:17 +00:00
cache-xsc3l2.c
…
context.c ARM: mm: make vmalloc_seq handling SMP safe 2022-01-25 09:53:52 +01:00
copypage-fa.c
…
copypage-feroceon.c ARM: 9263/1: use .arch directives instead of assembler command line flags 2022-11-08 18:36:17 +00:00
copypage-v4mc.c arm: implement the new page table range API 2023-08-24 16:20:20 -07:00
copypage-v4wb.c
…
copypage-v4wt.c
…
copypage-v6.c arm: implement the new page table range API 2023-08-24 16:20:20 -07:00
copypage-xsc3.c ARM: PXA: fix multi-cpu build of xsc3 2022-05-07 22:56:16 +02:00
copypage-xscale.c arm: implement the new page table range API 2023-08-24 16:20:20 -07:00
dma-mapping-nommu.c ARM/nommu: use the generic dma-direct code for non-coherent devices 2021-08-18 16:24:10 +02:00
dma-mapping.c arm: implement the new page table range API 2023-08-24 16:20:20 -07:00
dma.h
…
dump.c ARM: mm: Make virt_to_pfn() a static inline 2023-05-29 11:27:08 +02:00
extable.c
…
fault-armv.c arm: implement the new page table range API 2023-08-24 16:20:20 -07:00
fault.c Merge branch 'expand-stack' 2023-06-28 20:35:21 -07:00
fault.h ARM: 9304/1: add prototype for function called only from asm 2023-06-19 09:35:52 +01:00
flush.c ARM: 9359/1: flush: check if the folio is reserved for no-mapping addresses 2024-04-03 15:28:50 +02:00
fsr-2level.c
…
fsr-3level.c
…
hugetlbpage.c mm: remove unneeded includes of <asm/pgalloc.h> 2020-08-07 11:33:26 -07:00
idmap.c mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
init.c ARM: mm: Make virt_to_pfn() a static inline 2023-05-29 11:27:08 +02:00
iomap.c ARM: 8923/1: mm: include <asm/vga.h> for vga_base 2019-10-31 16:58:54 +00:00
ioremap.c ARM: mm: kill unused runtime hook arch_iounmap() 2022-06-27 12:21:09 +01:00
kasan_init.c ARM: mm: Make virt_to_pfn() a static inline 2023-05-29 11:27:08 +02:00
l2c-common.c
…
l2c-l2x0-resume.S
…
mm.h arm: implement the new page table range API 2023-08-24 16:20:20 -07:00
mmap.c arm: Use the generic devmem_is_allowed() 2020-12-11 12:28:24 -08:00
mmu.c arm: implement the new page table range API 2023-08-24 16:20:20 -07:00
nommu.c arm: implement the new page table range API 2023-08-24 16:20:20 -07:00
pabort-legacy.S
…
pabort-v6.S
…
pabort-v7.S
…
pageattr.c minmax: add in_range() macro 2023-08-24 16:20:18 -07:00
pgd.c ARM: 9016/2: Initialize the mapping of KASan shadow memory 2020-10-27 12:11:10 +00:00
physaddr.c ARM: mm: Make virt_to_pfn() a static inline 2023-05-29 11:27:08 +02:00
pmsa-v7.c ARM: 9069/1: NOMMU: Fix conversion for_each_membock() to for_each_mem_range() 2021-03-25 10:25:20 +00:00
pmsa-v8.c ARM: mm: Make virt_to_pfn() a static inline 2023-05-29 11:27:08 +02:00
proc-arm7tdmi.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
proc-arm9tdmi.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
proc-arm720.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
proc-arm740.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
proc-arm920.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
proc-arm922.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
proc-arm925.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
proc-arm926.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
proc-arm940.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
proc-arm946.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
proc-arm1020.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
proc-arm1020e.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
proc-arm1022.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
proc-arm1026.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
proc-fa526.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
proc-feroceon.S ARM: vfp: Remove workaround for Feroceon CPUs 2023-05-17 13:11:38 +02:00
proc-macros.S ARM: 9284/1: include <asm/pgtable.h> from proc-macros.S to fix -Wundef warnings 2023-01-11 16:22:05 +00:00
proc-mohawk.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
proc-sa110.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
proc-sa1100.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
proc-syms.c
…
proc-v6.S ARM: 9263/1: use .arch directives instead of assembler command line flags 2022-11-08 18:36:17 +00:00
proc-v7-2level.S ARM: 9263/1: use .arch directives instead of assembler command line flags 2022-11-08 18:36:17 +00:00
proc-v7-3level.S
…
proc-v7-bugs.c ARM: 9213/1: Print message about disabled Spectre workarounds only once 2022-07-06 22:44:49 +01:00
proc-v7.S ARM: mm: Make virt_to_pfn() a static inline 2023-05-29 11:27:08 +02:00
proc-v7m.S ARM: mm: Make virt_to_pfn() a static inline 2023-05-29 11:27:08 +02:00
proc-xsc3.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
proc-xscale.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
ptdump_debugfs.c ARM: 9074/1: ptdump: convert to DEFINE_SHOW_ATTRIBUTE 2021-04-18 19:15:13 +01:00
pv-fixup-asm.S ARM: mm: Make virt_to_pfn() a static inline 2023-05-29 11:27:08 +02:00
tlb-fa.S
…
tlb-v4.S
…
tlb-v4wb.S
…
tlb-v4wbi.S
…
tlb-v6.S ARM: 9263/1: use .arch directives instead of assembler command line flags 2022-11-08 18:36:17 +00:00
tlb-v7.S ARM: 9263/1: use .arch directives instead of assembler command line flags 2022-11-08 18:36:17 +00:00