| Message ID | 20181009101917.32497-1-jack@suse.cz (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | mm: Preserve _PAGE_DEVMAP across mprotect() calls | expand |
On Tue 09-10-18 12:19:17, Jan Kara wrote: > 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: 69660fd797c3 ("x86, mm: introduce _PAGE_DEVMAP") > Fixes: ebd31197931d ("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> > --- > arch/powerpc/include/asm/book3s/64/pgtable.h | 4 ++-- > arch/x86/include/asm/pgtable_types.h | 2 +- > 2 files changed, 3 insertions(+), 3 deletions(-) > > diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h > index 2fdc865ca374..2a2486526d1f 100644 > --- a/arch/powerpc/include/asm/book3s/64/pgtable.h > +++ b/arch/powerpc/include/asm/book3s/64/pgtable.h > @@ -114,7 +114,7 @@ > */ > #define _HPAGE_CHG_MASK (PTE_RPN_MASK | _PAGE_HPTEFLAGS | _PAGE_DIRTY | \ > _PAGE_ACCESSED | H_PAGE_THP_HUGE | _PAGE_PTE | \ > - _PAGE_SOFT_DIRTY) > + _PAGE_SOFT_DIRTY | _PAGE_DEVMAP) > /* > * user access blocked by key > */ > @@ -132,7 +132,7 @@ > */ > #define _PAGE_CHG_MASK (PTE_RPN_MASK | _PAGE_HPTEFLAGS | _PAGE_DIRTY | \ > _PAGE_ACCESSED | _PAGE_SPECIAL | _PAGE_PTE | \ > - _PAGE_SOFT_DIRTY) > + _PAGE_SOFT_DIRTY | _PAGE_DEVMAP) > > #define H_PTE_PKEY (H_PTE_PKEY_BIT0 | H_PTE_PKEY_BIT1 | H_PTE_PKEY_BIT2 | \ > H_PTE_PKEY_BIT3 | H_PTE_PKEY_BIT4) > diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h > index b64acb08a62b..106b7d0e2dae 100644 > --- a/arch/x86/include/asm/pgtable_types.h > +++ b/arch/x86/include/asm/pgtable_types.h > @@ -124,7 +124,7 @@ > */ > #define _PAGE_CHG_MASK (PTE_PFN_MASK | _PAGE_PCD | _PAGE_PWT | \ > _PAGE_SPECIAL | _PAGE_ACCESSED | _PAGE_DIRTY | \ > - _PAGE_SOFT_DIRTY) > + _PAGE_SOFT_DIRTY | _PAGE_DEVMAP) > #define _HPAGE_CHG_MASK (_PAGE_CHG_MASK | _PAGE_PSE) > > /* > -- > 2.16.4
On Tue, Oct 9, 2018 at 3:19 AM Jan Kara <jack@suse.cz> wrote: > > 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: 69660fd797c3 ("x86, mm: introduce _PAGE_DEVMAP") > Fixes: ebd31197931d ("powerpc/mm: Add devmap support for ppc64") > CC: stable@vger.kernel.org > Signed-off-by: Jan Kara <jack@suse.cz> Looks good, do you want me to take this upstream along with the livelock fix?
Looks good,
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
On Tue 09-10-18 10:55:14, Dan Williams wrote: > On Tue, Oct 9, 2018 at 3:19 AM Jan Kara <jack@suse.cz> wrote: > > > > 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: 69660fd797c3 ("x86, mm: introduce _PAGE_DEVMAP") > > Fixes: ebd31197931d ("powerpc/mm: Add devmap support for ppc64") > > CC: stable@vger.kernel.org > > Signed-off-by: Jan Kara <jack@suse.cz> > > Looks good, do you want me to take this upstream along with the livelock fix? Yes, I think that would be best. Thanks! Honza
diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h index 2fdc865ca374..2a2486526d1f 100644 --- a/arch/powerpc/include/asm/book3s/64/pgtable.h +++ b/arch/powerpc/include/asm/book3s/64/pgtable.h @@ -114,7 +114,7 @@ */ #define _HPAGE_CHG_MASK (PTE_RPN_MASK | _PAGE_HPTEFLAGS | _PAGE_DIRTY | \ _PAGE_ACCESSED | H_PAGE_THP_HUGE | _PAGE_PTE | \ - _PAGE_SOFT_DIRTY) + _PAGE_SOFT_DIRTY | _PAGE_DEVMAP) /* * user access blocked by key */ @@ -132,7 +132,7 @@ */ #define _PAGE_CHG_MASK (PTE_RPN_MASK | _PAGE_HPTEFLAGS | _PAGE_DIRTY | \ _PAGE_ACCESSED | _PAGE_SPECIAL | _PAGE_PTE | \ - _PAGE_SOFT_DIRTY) + _PAGE_SOFT_DIRTY | _PAGE_DEVMAP) #define H_PTE_PKEY (H_PTE_PKEY_BIT0 | H_PTE_PKEY_BIT1 | H_PTE_PKEY_BIT2 | \ H_PTE_PKEY_BIT3 | H_PTE_PKEY_BIT4) diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h index b64acb08a62b..106b7d0e2dae 100644 --- a/arch/x86/include/asm/pgtable_types.h +++ b/arch/x86/include/asm/pgtable_types.h @@ -124,7 +124,7 @@ */ #define _PAGE_CHG_MASK (PTE_PFN_MASK | _PAGE_PCD | _PAGE_PWT | \ _PAGE_SPECIAL | _PAGE_ACCESSED | _PAGE_DIRTY | \ - _PAGE_SOFT_DIRTY) + _PAGE_SOFT_DIRTY | _PAGE_DEVMAP) #define _HPAGE_CHG_MASK (_PAGE_CHG_MASK | _PAGE_PSE) /*
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: 69660fd797c3 ("x86, mm: introduce _PAGE_DEVMAP") Fixes: ebd31197931d ("powerpc/mm: Add devmap support for ppc64") CC: stable@vger.kernel.org Signed-off-by: Jan Kara <jack@suse.cz> --- arch/powerpc/include/asm/book3s/64/pgtable.h | 4 ++-- arch/x86/include/asm/pgtable_types.h | 2 +- 2 files changed, 3 insertions(+), 3 deletions(-)