Jan Kara 4628a64591 mm: Preserve _PAGE_DEVMAP across mprotect() calls ... Currently _PAGE_DEVMAP bit is not preserved in mprotect(2) calls. As a result we will see warnings such as: BUG: Bad page map in process JobWrk0013 pte:800001803875ea25 pmd:7624381067 addr:00007f0930720000 vm_flags:280000f9 anon_vma: (null) mapping:ffff97f2384056f0 index:0 file:457-000000fe00000030-00000009-000000ca-00000001_2001.fileblock fault:xfs_filemap_fault [xfs] mmap:xfs_file_mmap [xfs] readpage: (null) CPU: 3 PID: 15848 Comm: JobWrk0013 Tainted: G W 4.12.14-2.g7573215-default #1 SLE12-SP4 (unreleased) Hardware name: Intel Corporation S2600WFD/S2600WFD, BIOS SE5C620.86B.01.00.0833.051120182255 05/11/2018 Call Trace: dump_stack+0x5a/0x75 print_bad_pte+0x217/0x2c0 ? enqueue_task_fair+0x76/0x9f0 _vm_normal_page+0xe5/0x100 zap_pte_range+0x148/0x740 unmap_page_range+0x39a/0x4b0 unmap_vmas+0x42/0x90 unmap_region+0x99/0xf0 ? vma_gap_callbacks_rotate+0x1a/0x20 do_munmap+0x255/0x3a0 vm_munmap+0x54/0x80 SyS_munmap+0x1d/0x30 do_syscall_64+0x74/0x150 entry_SYSCALL_64_after_hwframe+0x3d/0xa2 ... when mprotect(2) gets used on DAX mappings. Also there is a wide variety of other failures that can result from the missing _PAGE_DEVMAP flag when the area gets used by get_user_pages() later. Fix the problem by including _PAGE_DEVMAP in a set of flags that get preserved by mprotect(2). Fixes: 69660fd797 ("x86, mm: introduce _PAGE_DEVMAP") Fixes: ebd3119793 ("powerpc/mm: Add devmap support for ppc64") Cc: <stable@vger.kernel.org> Signed-off-by: Jan Kara <jack@suse.cz> Acked-by: Michal Hocko <mhocko@suse.com> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Signed-off-by: Dan Williams <dan.j.williams@intel.com>		2018-10-09 11:44:58 -07:00
..
boot	x86/boot: Fix kexec booting failure in the SEV bit detection code	2018-09-27 19:35:03 +02:00
configs
crypto	crypto: x86/aegis,morus - Do not require OSXSAVE for SSE2	2018-09-14 14:08:27 +08:00
entry	x86/vdso: Fix vDSO build if a retpoline is emitted	2018-08-20 18:04:41 +02:00
events	perf/x86/intel: Add support/quirk for the MISPREDICT bit on Knights Landing CPUs	2018-09-10 10:03:01 +02:00
hyperv	x86/hyper-v: rename ipi_arg_{ex,non_ex} structures	2018-09-20 00:51:42 +02:00
ia32	syscalls/x86: auto-create compat_sys_*() prototypes	2018-04-02 20:16:18 +02:00
include	mm: Preserve _PAGE_DEVMAP across mprotect() calls	2018-10-09 11:44:58 -07:00
kernel	x86/mm: Expand static page table for fixmap space	2018-09-20 23:17:22 +02:00
kvm	KVM: nVMX: Fix bad cleanup on error of get/set nested state IOCTLs	2018-09-20 18:54:08 +02:00
lib	x86/nmi: Fix NMI uaccess race against CR3 switching	2018-08-31 17:08:22 +02:00
math-emu
mm	x86/mm: Expand static page table for fixmap space	2018-09-20 23:17:22 +02:00
net	bpf, x32: Fix regression caused by commit 24dea04767	2018-07-26 02:51:12 +02:00
oprofile
pci	PCI: Make early dump functionality generic	2018-06-29 20:06:07 -05:00
platform	x86/efi: Load fixmap GDT in efi_call_phys_epilog() before setting %cr3	2018-09-12 21:53:34 +02:00
power	Power management updates for 4.19-rc1	2018-08-14 13:12:24 -07:00
purgatory	kbuild: move bin2c back to scripts/ from scripts/basic/	2018-07-18 01:18:05 +09:00
ras
realmode
tools	x86/relocs: Add __end_rodata_aligned to S_REL	2018-08-09 20:42:07 +02:00
um	Consolidation of Kconfig files by Christoph Hellwig.	2018-08-15 13:05:12 -07:00
video
xen	xen: fixes for 4.19-rc5	2018-09-23 13:32:19 +02:00
.gitignore
Kbuild
Kconfig	x86/Kconfig: Fix trivial typo	2018-08-27 10:29:14 +02:00
Kconfig.cpu
Kconfig.debug	Kconfig: consolidate the "Kernel hacking" menu	2018-08-02 08:06:48 +09:00
Makefile	x86: Allow generating user-space headers without a compiler	2018-08-31 17:08:22 +02:00
Makefile_32.cpu
Makefile.um	kbuild: rename LDFLAGS to KBUILD_LDFLAGS	2018-08-24 08:22:08 +09:00