- 11 Sep, 2020 20 commits
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Will Deacon authored
The stage-2 page-tables are entirely encapsulated by the 'pgt' field of 'struct kvm_s2_mmu', so remove the unused 'pgd' field. Signed-off-by:
Will Deacon <will@kernel.org> Signed-off-by:
Marc Zyngier <maz@kernel.org> Reviewed-by:
Gavin Shan <gshan@redhat.com> Cc: Marc Zyngier <maz@kernel.org> Cc: Quentin Perret <qperret@google.com> Link: https://lore.kernel.org/r/20200911132529.19844-21-will@kernel.org
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Will Deacon authored
Now that KVM is using the generic page-table code to manage the guest stage-2 page-tables, we can remove a bunch of unused macros, #defines and static inline functions from the old implementation. Signed-off-by:
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Will Deacon authored
In preparation for removing the 'pgd' field of 'struct kvm_s2_mmu', update the few remaining users to check the 'pgt' field instead. Signed-off-by:
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Will Deacon authored
Convert user_mem_abort() to call kvm_pgtable_stage2_relax_perms() when handling a stage-2 permission fault and kvm_pgtable_stage2_map() when handling a stage-2 translation fault, rather than walking the page-table manually. Signed-off-by:
Alexandru Elisei <alexandru.elisei@arm.com> Cc: Marc Zyngier <maz@kernel.org> Cc: Quentin Perret <qperret@google.com> Link: https://lore.kernel.org/r/20200911132529.19844-18-will@kernel.org
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Will Deacon authored
Add support for relaxing the permissions of a stage-2 mapping (i.e. adding additional permissions) to the generic page-table code. Signed-off-by:
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Quentin Perret authored
Convert stage2_flush_memslot() to call the kvm_pgtable_stage2_flush() function of the generic page-table code instead of walking the page-table directly. Signed-off-by:
Quentin Perret <qperret@google.com> Signed-off-by:
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Quentin Perret authored
Add support for cache flushing a range of the stage-2 address space to the generic page-table code. Signed-off-by:
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Quentin Perret authored
Convert stage2_wp_range() to call the kvm_pgtable_stage2_wrprotect() function of the generic page-table code instead of walking the page-table directly. Signed-off-by:
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Quentin Perret authored
Add a stage-2 wrprotect() operation to the generic page-table code. Signed-off-by:
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Will Deacon authored
Convert the page-aging functions and access fault handler to use the generic page-table code instead of walking the page-table directly. Signed-off-by:
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Will Deacon authored
Add stage-2 mkyoung(), mkold() and is_young() operations to the generic page-table code. Signed-off-by:
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Will Deacon authored
Convert unmap_stage2_range() to use kvm_pgtable_stage2_unmap() instead of walking the page-table directly. Signed-off-by:
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Will Deacon authored
Convert kvm_set_spte_hva() to use kvm_pgtable_stage2_map() instead of stage2_set_pte(). Signed-off-by:
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Will Deacon authored
Convert kvm_phys_addr_ioremap() to use kvm_pgtable_stage2_map() instead of stage2_set_pte(). Signed-off-by:
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Will Deacon authored
Add stage-2 map() and unmap() operations to the generic page-table code. Signed-off-by:
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Will Deacon authored
Introduce alloc() and free() functions to the generic page-table code for guest stage-2 page-tables and plumb these into the existing KVM page-table allocator. Subsequent patches will convert other operations within the KVM allocator over to the generic code. Signed-off-by:
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Will Deacon authored
Now that we have a shiny new page-table allocator, replace the hyp page-table code with calls into the new API. This also allows us to remove the extended idmap code, as we can now simply ensure that the VA size is large enough to map everything we need. Signed-off-by:
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Will Deacon authored
The generic page-table walker is pretty useless as it stands, because it doesn't understand enough to allocate anything. Teach it about stage-1 page-tables, and hook up an API for allocating these for the hypervisor at EL2. Signed-off-by:
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Will Deacon authored
The KVM page-table code is intricately tied into the kernel page-table code and re-uses the pte/pmd/pud/p4d/pgd macros directly in an attempt to reduce code duplication. Unfortunately, the reality is that there is an awful lot of code required to make this work, and at the end of the day you're limited to creating page-tables with the same configuration as the host kernel. Furthermore, lifting the page-table code to run directly at EL2 on a non-VHE system (as we plan to to do in future patches) is practically impossible due to the number of dependencies it has on the core kernel. Introduce a framework for walking Armv8 page-tables configured independently from the host kernel. Signed-off-by:
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Will Deacon authored
kvm_mmu_free_memory_caches() is only called by kvm_arch_vcpu_destroy(), so inline the implementation and get rid of the extra function. Signed-off-by:
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- 07 Sep, 2020 1 commit
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Linus Torvalds authored
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- 06 Sep, 2020 4 commits
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git://git.kernel.dk/linux-blockLinus Torvalds authored
Pull more io_uring fixes from Jens Axboe: "Two followup fixes. One is fixing a regression from this merge window, the other is two commits fixing cancelation of deferred requests. Both have gone through full testing, and both spawned a few new regression test additions to liburing. - Don't play games with const, properly store the output iovec and assign it as needed. - Deferred request cancelation fix (Pavel)" * tag 'io_uring-5.9-2020-09-06' of git://git.kernel.dk/linux-block: io_uring: fix linked deferred ->files cancellation io_uring: fix cancel of deferred reqs with ->files io_uring: fix explicit async read/write mapping for large segments -
git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommuLinus Torvalds authored
Pull iommu fixes from Joerg Roedel: - three Intel VT-d fixes to fix address handling on 32bit, fix a NULL pointer dereference bug and serialize a hardware register access as required by the VT-d spec. - two patches for AMD IOMMU to force AMD GPUs into translation mode when memory encryption is active and disallow using IOMMUv2 functionality. This makes the AMDGPU driver work when memory encryption is active. - two more fixes for AMD IOMMU to fix updating the Interrupt Remapping Table Entries. - MAINTAINERS file update for the Qualcom IOMMU driver. * tag 'iommu-fixes-v5.9-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu: iommu/vt-d: Handle 36bit addressing for x86-32 iommu/amd: Do not use IOMMUv2 functionality when SME is active iommu/amd: Do not force direct mapping when SME is active iommu/amd: Use cmpxchg_double() when updating 128-bit IRTE iommu/amd: Restore IRTE.RemapEn bit after programming IRTE iommu/vt-d: Fix NULL pointer dereference in dev_iommu_priv_set() iommu/vt-d: Serialize IOMMU GCMD register modifications MAINTAINERS: Update QUALCOMM IOMMU after Arm SMMU drivers move
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull x86 fixes from Ingo Molnar: - more generic entry code ABI fallout - debug register handling bugfixes - fix vmalloc mappings on 32-bit kernels - kprobes instrumentation output fix on 32-bit kernels - fix over-eager WARN_ON_ONCE() on !SMAP hardware - NUMA debugging fix - fix Clang related crash on !RETPOLINE kernels * tag 'x86-urgent-2020-09-06' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/entry: Unbreak 32bit fast syscall x86/debug: Allow a single level of #DB recursion x86/entry: Fix AC assertion tracing/kprobes, x86/ptrace: Fix regs argument order for i386 x86, fakenuma: Fix invalid starting node ID x86/mm/32: Bring back vmalloc faulting on x86_32 x86/cmdline: Disable jump tables for cmdline.c
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git://git.kernel.org/pub/scm/linux/kernel/git/xen/tipLinus Torvalds authored
Pull xen updates from Juergen Gross: "A small series for fixing a problem with Xen PVH guests when running as backends (e.g. as dom0). Mapping other guests' memory is now working via ZONE_DEVICE, thus not requiring to abuse the memory hotplug functionality for that purpose" * tag 'for-linus-5.9-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip: xen: add helpers to allocate unpopulated memory memremap: rename MEMORY_DEVICE_DEVDAX to MEMORY_DEVICE_GENERIC xen/balloon: add header guard
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- 05 Sep, 2020 15 commits
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Pavel Begunkov authored
While looking for ->files in ->defer_list, consider that requests there may actually be links. Signed-off-by:
Pavel Begunkov <asml.silence@gmail.com> Signed-off-by:
Jens Axboe <axboe@kernel.dk>
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Pavel Begunkov authored
While trying to cancel requests with ->files, it also should look for requests in ->defer_list, otherwise it might end up hanging a thread. Cancel all requests in ->defer_list up to the last request there with matching ->files, that's needed to follow drain ordering semantics. Signed-off-by:
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Linus Torvalds authored
Merge tags 'auxdisplay-for-linus-v5.9-rc4', 'clang-format-for-linus-v5.9-rc4' and 'compiler-attributes-for-linus-v5.9-rc4' of git://github.com/ojeda/linux Pull misc fixes from Miguel Ojeda: "A trivial patch for auxdisplay: - Replace HTTP links with HTTPS ones (Alexander A. Klimov) The usual clang-format trivial update: - Update with the latest for_each macro list (Miguel Ojeda) And Luc requested me to pick a sparse fix on my queue, so here it goes along with other two trivial Compiler Attributes ones (also from Luc). - sparse: use static inline for __chk_{user,io}_ptr() (Luc Van Oostenryck) - Compiler Attributes: fix comment concerning GCC 4.6 (Luc Van Oostenryck) - Compiler Attributes: remove comment about sparse not supporting __has_attribute (Luc Van Oostenryck)" * tag 'auxdisplay-for-linus-v5.9-rc4' of git://github.com/ojeda/linux: auxdisplay: Replace HTTP links with HTTPS ones * tag 'clang-format-for-linus-v5.9-rc4' of git://github.com/ojeda/linux: clang-format: Update with the latest for_each macro list * tag 'compiler-attributes-for-linus-v5.9-rc4' of git://github.com/ojeda/linux: sparse: use static inline for __chk_{user,io}_ptr() Compiler Attributes: fix comment concerning GCC 4.6 Compiler Attributes: remove comment about sparse not supporting __has_attribute
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git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arcLinus Torvalds authored
Pull ARC fixes from Vineet Gupta: - HSDK-4xd Dev system: perf driver updates for sampling interrupt - HSDK* Dev System: Ethernet broken [Evgeniy Didin] - HIGHMEM broken (2 memory banks) [Mike Rapoport] - show_regs() rewrite once and for all - Other minor fixes * tag 'arc-5.9-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc: ARC: [plat-hsdk]: Switch ethernet phy-mode to rgmii-id arc: fix memory initialization for systems with two memory banks irqchip/eznps: Fix build error for !ARC700 builds ARC: show_regs: fix r12 printing and simplify ARC: HSDK: wireup perf irq ARC: perf: don't bail setup if pct irq missing in device-tree ARC: pgalloc.h: delete a duplicated word + other fixes
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Linus Torvalds authored
Merge misc fixes from Andrew Morton: "19 patches. Subsystems affected by this patch series: MAINTAINERS, ipc, fork, checkpatch, lib, and mm (memcg, slub, pagemap, madvise, migration, hugetlb)" * emailed patches from Andrew Morton <akpm@linux-foundation.org>: include/linux/log2.h: add missing () around n in roundup_pow_of_two() mm/khugepaged.c: fix khugepaged's request size in collapse_file mm/hugetlb: fix a race between hugetlb sysctl handlers mm/hugetlb: try preferred node first when alloc gigantic page from cma mm/migrate: preserve soft dirty in remove_migration_pte() mm/migrate: remove unnecessary is_zone_device_page() check mm/rmap: fixup copying of soft dirty and uffd ptes mm/migrate: fixup setting UFFD_WP flag mm: madvise: fix vma user-after-free checkpatch: fix the usage of capture group ( ... ) fork: adjust sysctl_max_threads definition to match prototype ipc: adjust proc_ipc_sem_dointvec definition to match prototype mm: track page table modifications in __apply_to_page_range() MAINTAINERS: IA64: mark Status as Odd Fixes only MAINTAINERS: add LLVM maintainers MAINTAINERS: update Cavium/Marvell entries mm: slub: fix conversion of freelist_corrupted() mm: memcg: fix memcg reclaim soft lockup memcg: fix use-after-free in uncharge_batch
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Jason Gunthorpe authored
Otherwise gcc generates warnings if the expression is complicated. Fixes: 312a0c17 ("[PATCH] LOG2: Alter roundup_pow_of_two() so that it can use a ilog2() on a constant") Signed-off-by:
Jason Gunthorpe <jgg@nvidia.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Link: https://lkml.kernel.org/r/0-v1-8a2697e3c003+41165-log_brackets_jgg@nvidia.comSigned-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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David Howells authored
collapse_file() in khugepaged passes PAGE_SIZE as the number of pages to be read to page_cache_sync_readahead(). The intent was probably to read a single page. Fix it to use the number of pages to the end of the window instead. Fixes: 99cb0dbd ("mm,thp: add read-only THP support for (non-shmem) FS") Signed-off-by:
David Howells <dhowells@redhat.com> Signed-off-by:
Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by:
Song Liu <songliubraving@fb.com> Acked-by:
Yang Shi <shy828301@gmail.com> Acked-by:
Pankaj Gupta <pankaj.gupta.linux@gmail.com> Cc: Eric Biggers <ebiggers@google.com> Link: https://lkml.kernel.org/r/20200903140844.14194-2-willy@infradead.orgSigned-off-by:
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Muchun Song authored
There is a race between the assignment of `table->data` and write value to the pointer of `table->data` in the __do_proc_doulongvec_minmax() on the other thread. CPU0: CPU1: proc_sys_write hugetlb_sysctl_handler proc_sys_call_handler hugetlb_sysctl_handler_common hugetlb_sysctl_handler table->data = &tmp; hugetlb_sysctl_handler_common table->data = &tmp; proc_doulongvec_minmax do_proc_doulongvec_minmax sysctl_head_finish __do_proc_doulongvec_minmax unuse_table i = table->data; *i = val; // corrupt CPU1's stack Fix this by duplicating the `table`, and only update the duplicate of it. And introduce a helper of proc_hugetlb_doulongvec_minmax() to simplify the code. The following oops was seen: BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0010) - not-present page Code: Bad RIP value. ... Call Trace: ? set_max_huge_pages+0x3da/0x4f0 ? alloc_pool_huge_page+0x150/0x150 ? proc_doulongvec_minmax+0x46/0x60 ? hugetlb_sysctl_handler_common+0x1c7/0x200 ? nr_hugepages_store+0x20/0x20 ? copy_fd_bitmaps+0x170/0x170 ? hugetlb_sysctl_handler+0x1e/0x20 ? proc_sys_call_handler+0x2f1/0x300 ? unregister_sysctl_table+0xb0/0xb0 ? __fd_install+0x78/0x100 ? proc_sys_write+0x14/0x20 ? __vfs_write+0x4d/0x90 ? vfs_write+0xef/0x240 ? ksys_write+0xc0/0x160 ? __ia32_sys_read+0x50/0x50 ? __close_fd+0x129/0x150 ? __x64_sys_write+0x43/0x50 ? do_syscall_64+0x6c/0x200 ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 Fixes: e5ff2159 ("hugetlb: multiple hstates for multiple page sizes") Signed-off-by:Muchun Song <songmuchun@bytedance.com> Signed-off-by:
Mike Kravetz <mike.kravetz@oracle.com> Cc: Andi Kleen <ak@linux.intel.com> Link: http://lkml.kernel.org/r/20200828031146.43035-1-songmuchun@bytedance.comSigned-off-by:
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Li Xinhai authored
Since commit cf11e85f ("mm: hugetlb: optionally allocate gigantic hugepages using cma"), the gigantic page would be allocated from node which is not the preferred node, although there are pages available from that node. The reason is that the nid parameter has been ignored in alloc_gigantic_page(). Besides, the __GFP_THISNODE also need be checked if user required to alloc only from the preferred node. After this patch, the preferred node is tried first before other allowed nodes, and don't try to allocate from other nodes if __GFP_THISNODE is specified. If user don't specify the preferred node, the current node will be used as preferred node, which makes sure consistent behavior of allocating gigantic and non-gigantic hugetlb page. Fixes: cf11e85f ("mm: hugetlb: optionally allocate gigantic hugepages using cma") Signed-off-by:
Li Xinhai <lixinhai.lxh@gmail.com> Signed-off-by:
Michal Hocko <mhocko@suse.com> Cc: Roman Gushchin <guro@fb.com> Link: https://lkml.kernel.org/r/20200902025016.697260-1-lixinhai.lxh@gmail.comSigned-off-by:
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Ralph Campbell authored
The code to remove a migration PTE and replace it with a device private PTE was not copying the soft dirty bit from the migration entry. This could lead to page contents not being marked dirty when faulting the page back from device private memory. Signed-off-by:
Ralph Campbell <rcampbell@nvidia.com> Signed-off-by:
Christoph Hellwig <hch@lst.de> Cc: Jerome Glisse <jglisse@redhat.com> Cc: Alistair Popple <apopple@nvidia.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Jason Gunthorpe <jgg@nvidia.com> Cc: Bharata B Rao <bharata@linux.ibm.com> Link: https://lkml.kernel.org/r/20200831212222.22409-3-rcampbell@nvidia.comSigned-off-by:
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Ralph Campbell authored
Patch series "mm/migrate: preserve soft dirty in remove_migration_pte()". I happened to notice this from code inspection after seeing Alistair Popple's patch ("mm/rmap: Fixup copying of soft dirty and uffd ptes"). This patch (of 2): The check for is_zone_device_page() and is_device_private_page() is unnecessary since the latter is sufficient to determine if the page is a device private page. Simplify the code for easier reading. Signed-off-by: -
Alistair Popple authored
During memory migration a pte is temporarily replaced with a migration swap pte. Some pte bits from the existing mapping such as the soft-dirty and uffd write-protect bits are preserved by copying these to the temporary migration swap pte. However these bits are not stored at the same location for swap and non-swap ptes. Therefore testing these bits requires using the appropriate helper function for the given pte type. Unfortunately several code locations were found where the wrong helper function is being used to test soft_dirty and uffd_wp bits which leads to them getting incorrectly set or cleared during page-migration. Fix these by using the correct tests based on pte type. Fixes: a5430dda ("mm/migrate: support un-addressable ZONE_DEVICE page in migration") Fixes: 8c3328f1 ("mm/migrate: migrate_vma() unmap page from vma while collecting pages") Fixes: f45ec5ff ("userfaultfd: wp: support swap and page migration") Signed-off-by:
Alistair Popple <alistair@popple.id.au> Signed-off-by:
Peter Xu <peterx@redhat.com> Cc: Jérôme Glisse <jglisse@redhat.com> Cc: John Hubbard <jhubbard@nvidia.com> Cc: Ralph Campbell <rcampbell@nvidia.com> Cc: Alistair Popple <alistair@popple.id.au> Cc: <stable@vger.kernel.org> Link: https://lkml.kernel.org/r/20200825064232.10023-2-alistair@popple.id.auSigned-off-by:
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Alistair Popple authored
Commit f45ec5ff ("userfaultfd: wp: support swap and page migration") introduced support for tracking the uffd wp bit during page migration. However the non-swap PTE variant was used to set the flag for zone device private pages which are a type of swap page. This leads to corruption of the swap offset if the original PTE has the uffd_wp flag set. Fixes: f45ec5ff ("userfaultfd: wp: support swap and page migration") Signed-off-by:
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Yang Shi authored
The syzbot reported the below use-after-free: BUG: KASAN: use-after-free in madvise_willneed mm/madvise.c:293 [inline] BUG: KASAN: use-after-free in madvise_vma mm/madvise.c:942 [inline] BUG: KASAN: use-after-free in do_madvise.part.0+0x1c8b/0x1cf0 mm/madvise.c:1145 Read of size 8 at addr ffff8880a6163eb0 by task syz-executor.0/9996 CPU: 0 PID: 9996 Comm: syz-executor.0 Not tainted 5.9.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x18f/0x20d lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xae/0x497 mm/kasan/report.c:383 __kasan_report mm/kasan/report.c:513 [inline] kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530 madvise_willneed mm/madvise.c:293 [inline] madvise_vma mm/madvise.c:942 [inline] do_madvise.part.0+0x1c8b/0x1cf0 mm/madvise.c:1145 do_madvise mm/madvise.c:1169 [inline] __do_sys_madvise mm/madvise.c:1171 [inline] __se_sys_madvise mm/madvise.c:1169 [inline] __x64_sys_madvise+0xd9/0x110 mm/madvise.c:1169 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Allocated by task 9992: kmem_cache_alloc+0x138/0x3a0 mm/slab.c:3482 vm_area_alloc+0x1c/0x110 kernel/fork.c:347 mmap_region+0x8e5/0x1780 mm/mmap.c:1743 do_mmap+0xcf9/0x11d0 mm/mmap.c:1545 vm_mmap_pgoff+0x195/0x200 mm/util.c:506 ksys_mmap_pgoff+0x43a/0x560 mm/mmap.c:1596 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 9992: kmem_cache_free.part.0+0x67/0x1f0 mm/slab.c:3693 remove_vma+0x132/0x170 mm/mmap.c:184 remove_vma_list mm/mmap.c:2613 [inline] __do_munmap+0x743/0x1170 mm/mmap.c:2869 do_munmap mm/mmap.c:2877 [inline] mmap_region+0x257/0x1780 mm/mmap.c:1716 do_mmap+0xcf9/0x11d0 mm/mmap.c:1545 vm_mmap_pgoff+0x195/0x200 mm/util.c:506 ksys_mmap_pgoff+0x43a/0x560 mm/mmap.c:1596 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 It is because vma is accessed after releasing mmap_lock, but someone else acquired the mmap_lock and the vma is gone. Releasing mmap_lock after accessing vma should fix the problem. Fixes: 692fe624 ("mm: Handle MADV_WILLNEED through vfs_fadvise()") Reported-by: syzbot+b90df26038d1d5d85c97@syzkaller.appspotmail.com Signed-off-by:Jan Kara <jack@suse.cz> Cc: <stable@vger.kernel.org> [5.4+] Link: https://lkml.kernel.org/r/20200816141204.162624-1-shy828301@gmail.comSigned-off-by:
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Mrinal Pandey authored
The usage of "capture group (...)" in the immediate condition after `&&` results in `$1` being uninitialized. This issues a warning "Use of uninitialized value $1 in regexp compilation at ./scripts/checkpatch.pl line 2638". I noticed this bug while running checkpatch on the set of commits from v5.7 to v5.8-rc1 of the kernel on the commits with a diff content in their commit message. This bug was introduced in the script by commit e518e9a5 ("checkpatch: emit an error when there's a diff in a changelog"). It has been in the script since then. The author intended to store the match made by capture group in variable `$1`. This should have contained the name of the file as `[\w/]+` matched. However, this couldn't be accomplished due to usage of capture group and `$1` in the same regular expression. Fix this by placing the capture group in the condition before `&&`. Thus, `$1` can be initialized to the text that capture group matches thereby setting it to the desired and required value. Fixes: e518e9a5 ("checkpatch: emit an error when there's a diff in a changelog") Signed-off-by:
Mrinal Pandey <mrinalmni@gmail.com> Signed-off-by:
Lukas Bulwahn <lukas.bulwahn@gmail.com> Reviewed-by:
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