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[patch 11/31] userfaultfd: use ENOENT instead of EFAULT if the atomic copy user fails

by akpm＠linux-foundation.org

From: Andrea Arcangeli <aarcange(a)redhat.com> Subject: userfaultfd: use ENOENT instead of EFAULT if the atomic copy user fails Patch series "userfaultfd shmem updates". Jann found two bugs in the userfaultfd shmem MAP_SHARED backend: the lack of the VM_MAYWRITE check and the lack of i_size checks. Then looking into the above we also fixed the MAP_PRIVATE case. Hugh by source review also found a data loss source if UFFDIO_COPY is used on shmem MAP_SHARED PROT_READ mappings (the production usages incidentally run with PROT_READ|PROT_WRITE, so the data loss couldn't happen in those production usages like with QEMU). The whole patchset is marked for stable. We verified QEMU postcopy live migration with guest running on shmem MAP_PRIVATE run as well as before after the fix of shmem MAP_PRIVATE. Regardless if it's shmem or hugetlbfs or MAP_PRIVATE or MAP_SHARED, QEMU unconditionally invokes a punch hole if the guest mapping is filebacked and a MADV_DONTNEED too (needed to get rid of the MAP_PRIVATE COWs and for the anon backend). This patch (of 5): We internally used EFAULT to communicate with the caller, switch to ENOENT, so EFAULT can be used as a non internal retval. Link: http://lkml.kernel.org/r/20181126173452.26955-2-aarcange@redhat.com Fixes: 4c27fe4c4c84 ("userfaultfd: shmem: add shmem_mcopy_atomic_pte for userfaultfd support") Signed-off-by: Andrea Arcangeli <aarcange(a)redhat.com> Reviewed-by: Mike Rapoport <rppt(a)linux.ibm.com> Reviewed-by: Hugh Dickins <hughd(a)google.com> Cc: Mike Kravetz <mike.kravetz(a)oracle.com> Cc: Jann Horn <jannh(a)google.com> Cc: Peter Xu <peterx(a)redhat.com> Cc: "Dr. David Alan Gilbert" <dgilbert(a)redhat.com> Cc: <stable(a)vger.kernel.org> Cc: stable(a)vger.kernel.org Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org> --- mm/hugetlb.c | 2 +- mm/shmem.c | 2 +- mm/userfaultfd.c | 6 +++--- 3 files changed, 5 insertions(+), 5 deletions(-) --- a/mm/hugetlb.c~userfaultfd-use-enoent-instead-of-efault-if-the-atomic-copy-user-fails +++ a/mm/hugetlb.c @@ -4080,7 +4080,7 @@ int hugetlb_mcopy_atomic_pte(struct mm_s /* fallback to copy_from_user outside mmap_sem */ if (unlikely(ret)) { - ret = -EFAULT; + ret = -ENOENT; *pagep = page; /* don't free the page */ goto out; --- a/mm/shmem.c~userfaultfd-use-enoent-instead-of-efault-if-the-atomic-copy-user-fails +++ a/mm/shmem.c @@ -2238,7 +2238,7 @@ static int shmem_mfill_atomic_pte(struct *pagep = page; shmem_inode_unacct_blocks(inode, 1); /* don't free the page */ - return -EFAULT; + return -ENOENT; } } else { /* mfill_zeropage_atomic */ clear_highpage(page); --- a/mm/userfaultfd.c~userfaultfd-use-enoent-instead-of-efault-if-the-atomic-copy-user-fails +++ a/mm/userfaultfd.c @@ -48,7 +48,7 @@ static int mcopy_atomic_pte(struct mm_st /* fallback to copy_from_user outside mmap_sem */ if (unlikely(ret)) { - ret = -EFAULT; + ret = -ENOENT; *pagep = page; /* don't free the page */ goto out; @@ -274,7 +274,7 @@ retry: cond_resched(); - if (unlikely(err == -EFAULT)) { + if (unlikely(err == -ENOENT)) { up_read(&dst_mm->mmap_sem); BUG_ON(!page); @@ -530,7 +530,7 @@ retry: src_addr, &page, zeropage); cond_resched(); - if (unlikely(err == -EFAULT)) { + if (unlikely(err == -ENOENT)) { void *page_kaddr; up_read(&dst_mm->mmap_sem); _

6 years, 10 months

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[patch 10/31] lib/test_kmod.c: fix rmmod double free

by akpm＠linux-foundation.org

From: Luis Chamberlain <mcgrof(a)kernel.org> Subject: lib/test_kmod.c: fix rmmod double free We free the misc device string twice on rmmod; fix this. Without this we cannot remove the module without crashing. Link: http://lkml.kernel.org/r/20181124050500.5257-1-mcgrof@kernel.org Signed-off-by: Luis Chamberlain <mcgrof(a)kernel.org> Reported-by: Randy Dunlap <rdunlap(a)infradead.org> Reviewed-by: Andrew Morton <akpm(a)linux-foundation.org> Cc: <stable(a)vger.kernel.org> [4.12+] Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org> --- lib/test_kmod.c | 1 - 1 file changed, 1 deletion(-) --- a/lib/test_kmod.c~test_kmod-fix-rmmod-double-free +++ a/lib/test_kmod.c @@ -1214,7 +1214,6 @@ void unregister_test_dev_kmod(struct kmo dev_info(test_dev->dev, "removing interface\n"); misc_deregister(&test_dev->misc_dev); - kfree(&test_dev->misc_dev.name); mutex_unlock(&test_dev->config_mutex); mutex_unlock(&test_dev->trigger_mutex); _

6 years, 10 months

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[patch 05/31] mm: use swp_offset as key in shmem_replace_page()

by akpm＠linux-foundation.org

From: Yu Zhao <yuzhao(a)google.com> Subject: mm: use swp_offset as key in shmem_replace_page() We changed the key of swap cache tree from swp_entry_t.val to swp_offset. We need to do so in shmem_replace_page() as well. Hugh said: : shmem_replace_page() has been wrong since the day I wrote it: good : enough to work on swap "type" 0, which is all most people ever use : (especially those few who need shmem_replace_page() at all), but broken : once there are any non-0 swp_type bits set in the higher order bits. Link: http://lkml.kernel.org/r/20181121215442.138545-1-yuzhao@google.com Fixes: f6ab1f7f6b2d ("mm, swap: use offset of swap entry as key of swap cache") Signed-off-by: Yu Zhao <yuzhao(a)google.com> Reviewed-by: Matthew Wilcox <willy(a)infradead.org> Acked-by: Hugh Dickins <hughd(a)google.com> Cc: <stable(a)vger.kernel.org> [4.9+] Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org> --- mm/shmem.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) --- a/mm/shmem.c~mm-use-swp_offset-as-key-in-shmem_replace_page +++ a/mm/shmem.c @@ -1509,11 +1509,13 @@ static int shmem_replace_page(struct pag { struct page *oldpage, *newpage; struct address_space *swap_mapping; + swp_entry_t entry; pgoff_t swap_index; int error; oldpage = *pagep; - swap_index = page_private(oldpage); + entry.val = page_private(oldpage); + swap_index = swp_offset(entry); swap_mapping = page_mapping(oldpage); /* @@ -1532,7 +1534,7 @@ static int shmem_replace_page(struct pag __SetPageLocked(newpage); __SetPageSwapBacked(newpage); SetPageUptodate(newpage); - set_page_private(newpage, swap_index); + set_page_private(newpage, entry.val); SetPageSwapCache(newpage); /* _

6 years, 10 months

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[patch 04/31] mm: cleancache: fix corruption on missed inode invalidation

by akpm＠linux-foundation.org

From: Pavel Tikhomirov <ptikhomirov(a)virtuozzo.com> Subject: mm: cleancache: fix corruption on missed inode invalidation If all pages are deleted from the mapping by memory reclaim and also moved to the cleancache: __delete_from_page_cache (no shadow case) unaccount_page_cache_page cleancache_put_page page_cache_delete mapping->nrpages -= nr (nrpages becomes 0) We don't clean the cleancache for an inode after final file truncation (removal). truncate_inode_pages_final check (nrpages || nrexceptional) is false no truncate_inode_pages no cleancache_invalidate_inode(mapping) These way when reading the new file created with same inode we may get these trash leftover pages from cleancache and see wrong data instead of the contents of the new file. Fix it by always doing truncate_inode_pages which is already ready for nrpages == 0 && nrexceptional == 0 case and just invalidates inode. [akpm(a)linux-foundation.org: add comment, per Jan] Link: http://lkml.kernel.org/r/20181112095734.17979-1-ptikhomirov@virtuozzo.com Fixes: commit 91b0abe36a7b ("mm + fs: store shadow entries in page cache") Signed-off-by: Pavel Tikhomirov <ptikhomirov(a)virtuozzo.com> Reviewed-by: Vasily Averin <vvs(a)virtuozzo.com> Reviewed-by: Andrey Ryabinin <aryabinin(a)virtuozzo.com> Reviewed-by: Jan Kara <jack(a)suse.cz> Cc: Johannes Weiner <hannes(a)cmpxchg.org> Cc: Mel Gorman <mgorman(a)techsingularity.net> Cc: Matthew Wilcox <willy(a)infradead.org> Cc: Andi Kleen <ak(a)linux.intel.com> Cc: <stable(a)vger.kernel.org> Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org> --- mm/truncate.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) --- a/mm/truncate.c~mm-cleancache-fix-corruption-on-missed-inode-invalidation +++ a/mm/truncate.c @@ -517,9 +517,13 @@ void truncate_inode_pages_final(struct a */ xa_lock_irq(&mapping->i_pages); xa_unlock_irq(&mapping->i_pages); - - truncate_inode_pages(mapping, 0); } + + /* + * Cleancache needs notification even if there are no pages or shadow + * entries. + */ + truncate_inode_pages(mapping, 0); } EXPORT_SYMBOL(truncate_inode_pages_final); _

6 years, 10 months

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stable-rc/linux-4.14.y boot: 130 boots: 0 failed, 123 passed with 3 offline, 3 untried/unknown, 1 conflict (v4.14.84-96-gce3bc714816f)

by kernelci.org bot

stable-rc/linux-4.14.y boot: 130 boots: 0 failed, 123 passed with 3 offline, 3 untried/unknown, 1 conflict (v4.14.84-96-gce3bc714816f) Full Boot Summary: https://kernelci.org/boot/all/job/stable-rc/branch/linux-4.14.y/kernel/v4.1… Full Build Summary: https://kernelci.org/build/stable-rc/branch/linux-4.14.y/kernel/v4.14.84-96… Tree: stable-rc Branch: linux-4.14.y Git Describe: v4.14.84-96-gce3bc714816f Git Commit: ce3bc714816ffce90a62674e490852d74686c92e Git URL: http://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git Tested: 65 unique boards, 23 SoC families, 15 builds out of 197 Boot Regressions Detected: arm64: defconfig: meson-gxbb-p200: lab-baylibre: new failure (last pass: v4.14.84-100-gae0375de4a2b) Offline Platforms: arm: multi_v7_defconfig: stih410-b2120: 1 offline lab arm64: defconfig: meson-gxl-s905d-p230: 1 offline lab meson-gxl-s905x-p212: 1 offline lab Conflicting Boot Failure Detected: (These likely are not failures as other labs are reporting PASS. Needs review.) arm64: defconfig: meson-gxbb-p200: lab-baylibre: FAIL lab-baylibre-seattle: PASS --- For more info write to <info(a)kernelci.org>

6 years, 10 months

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[PATCH v2] ARC: change defconfig defaults to ARCv2

by Alexey Brodkin

From: Kevin Hilman <khilman(a)baylibre.com> Change the default defconfig (used with 'make defconfig') to the ARCv2 nsim_hs_defconfig, and also switch the default Kconfig ISA selection to ARCv2. This allows several default defconfigs (e.g. make defconfig, make allnoconfig, make tinyconfig) to all work with ARCv2 by default. Note since we change default architecture from ARCompact to ARCv2 it's required to explicitly mention architecture type in ARCompact defconfigs otherwise ARCv2 will be implied and binaries will be generated for ARCv2. Signed-off-by: Kevin Hilman <khilman(a)baylibre.com> Signed-off-by: Alexey Brodkin <abrodkin(a)synopsys.com> Cc: <stable(a)vger.kernel.org> # 4.4.x --- Changes v1 -> v2: * Added CONFIG_ISA_ARCOMPACT to ARCompact defconfigs arch/arc/Kconfig | 2 +- arch/arc/Makefile | 2 +- arch/arc/configs/axs101_defconfig | 1 + arch/arc/configs/nps_defconfig | 1 + arch/arc/configs/nsim_700_defconfig | 1 + arch/arc/configs/nsimosci_defconfig | 1 + arch/arc/configs/tb10x_defconfig | 1 + 7 files changed, 7 insertions(+), 2 deletions(-) diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig index 5fcbda6b37cc..6dd783557330 100644 --- a/arch/arc/Kconfig +++ b/arch/arc/Kconfig @@ -109,7 +109,7 @@ endmenu choice prompt "ARC Instruction Set" - default ISA_ARCOMPACT + default ISA_ARCV2 config ISA_ARCOMPACT bool "ARCompact ISA" diff --git a/arch/arc/Makefile b/arch/arc/Makefile index c64c505d966c..df00578c279d 100644 --- a/arch/arc/Makefile +++ b/arch/arc/Makefile @@ -6,7 +6,7 @@ # published by the Free Software Foundation. # -KBUILD_DEFCONFIG := nsim_700_defconfig +KBUILD_DEFCONFIG := nsim_hs_defconfig cflags-y += -fno-common -pipe -fno-builtin -mmedium-calls -D__linux__ cflags-$(CONFIG_ISA_ARCOMPACT) += -mA7 diff --git a/arch/arc/configs/axs101_defconfig b/arch/arc/configs/axs101_defconfig index 8c23bd086cd0..020d4493edfd 100644 --- a/arch/arc/configs/axs101_defconfig +++ b/arch/arc/configs/axs101_defconfig @@ -14,6 +14,7 @@ CONFIG_PERF_EVENTS=y # CONFIG_VM_EVENT_COUNTERS is not set # CONFIG_SLUB_DEBUG is not set # CONFIG_COMPAT_BRK is not set +CONFIG_ISA_ARCOMPACT=y CONFIG_MODULES=y CONFIG_MODULE_FORCE_LOAD=y CONFIG_MODULE_UNLOAD=y diff --git a/arch/arc/configs/nps_defconfig b/arch/arc/configs/nps_defconfig index ae7a0d8be98d..6e84060e7c90 100644 --- a/arch/arc/configs/nps_defconfig +++ b/arch/arc/configs/nps_defconfig @@ -15,6 +15,7 @@ CONFIG_SYSCTL_SYSCALL=y CONFIG_EMBEDDED=y CONFIG_PERF_EVENTS=y # CONFIG_COMPAT_BRK is not set +CONFIG_ISA_ARCOMPACT=y CONFIG_KPROBES=y CONFIG_MODULES=y CONFIG_MODULE_FORCE_LOAD=y diff --git a/arch/arc/configs/nsim_700_defconfig b/arch/arc/configs/nsim_700_defconfig index 8e0b8b134cd9..219c2a65294b 100644 --- a/arch/arc/configs/nsim_700_defconfig +++ b/arch/arc/configs/nsim_700_defconfig @@ -15,6 +15,7 @@ CONFIG_EMBEDDED=y CONFIG_PERF_EVENTS=y # CONFIG_SLUB_DEBUG is not set # CONFIG_COMPAT_BRK is not set +CONFIG_ISA_ARCOMPACT=y CONFIG_KPROBES=y CONFIG_MODULES=y # CONFIG_LBDAF is not set diff --git a/arch/arc/configs/nsimosci_defconfig b/arch/arc/configs/nsimosci_defconfig index ad77f20e5aa6..35dfc6491a09 100644 --- a/arch/arc/configs/nsimosci_defconfig +++ b/arch/arc/configs/nsimosci_defconfig @@ -15,6 +15,7 @@ CONFIG_EMBEDDED=y CONFIG_PERF_EVENTS=y # CONFIG_SLUB_DEBUG is not set # CONFIG_COMPAT_BRK is not set +CONFIG_ISA_ARCOMPACT=y CONFIG_KPROBES=y CONFIG_MODULES=y # CONFIG_LBDAF is not set diff --git a/arch/arc/configs/tb10x_defconfig b/arch/arc/configs/tb10x_defconfig index a7f65313f84a..e71ade3cf9c8 100644 --- a/arch/arc/configs/tb10x_defconfig +++ b/arch/arc/configs/tb10x_defconfig @@ -19,6 +19,7 @@ CONFIG_KALLSYMS_ALL=y # CONFIG_AIO is not set CONFIG_EMBEDDED=y # CONFIG_COMPAT_BRK is not set +CONFIG_ISA_ARCOMPACT=y CONFIG_SLAB=y CONFIG_MODULES=y CONFIG_MODULE_FORCE_LOAD=y -- 2.16.2

6 years, 10 months

3
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[PATCH 2/2] btrfs: run delayed items before dropping the snapshot

by Josef Bacik

From: Josef Bacik <jbacik(a)fb.com> With my delayed refs patches in place we started seeing a large amount of aborts in __btrfs_free_extent BTRFS error (device sdb1): unable to find ref byte nr 91947008 parent 0 root 35964 owner 1 offset 0 Call Trace: ? btrfs_merge_delayed_refs+0xaf/0x340 __btrfs_run_delayed_refs+0x6ea/0xfc0 ? btrfs_set_path_blocking+0x31/0x60 btrfs_run_delayed_refs+0xeb/0x180 btrfs_commit_transaction+0x179/0x7f0 ? btrfs_check_space_for_delayed_refs+0x30/0x50 ? should_end_transaction.isra.19+0xe/0x40 btrfs_drop_snapshot+0x41c/0x7c0 btrfs_clean_one_deleted_snapshot+0xb5/0xd0 cleaner_kthread+0xf6/0x120 kthread+0xf8/0x130 ? btree_invalidatepage+0x90/0x90 ? kthread_bind+0x10/0x10 ret_from_fork+0x35/0x40 This was because btrfs_drop_snapshot depends on the root not being modified while it's dropping the snapshot. It will unlock the root node (and really every node) as it walks down the tree, only to re-lock it when it needs to do something. This is a problem because if we modify the tree we could cow a block in our path, which free's our reference to that block. Then once we get back to that shared block we'll free our reference to it again, and get ENOENT when trying to lookup our extent reference to that block in __btrfs_free_extent. This is ultimately happening because we have delayed items left to be processed for our deleted snapshot _after_ all of the inodes are closed for the snapshot. We only run the delayed inode item if we're deleting the inode, and even then we do not run the delayed insertions or delayed removals. These can be run at any point after our final inode does it's last iput, which is what triggers the snapshot deletion. We can end up with the snapshot deletion happening and then have the delayed items run on that file system, resulting in the above problem. This problem has existed forever, however my patches made it much easier to hit as I wake up the cleaner much more often to deal with delayed iputs, which made us more likely to start the snapshot dropping work before the transaction commits, which is when the delayed items would generally be run. Before, generally speaking, we would run the delayed items, commit the transaction, and wakeup the cleaner thread to start deleting snapshots, which means we were less likely to hit this problem. You could still hit it if you had multiple snapshots to be deleted and ended up with lots of delayed items, but it was definitely harder. Fix for now by simply running all the delayed items before starting to drop the snapshot. We could make this smarter in the future by making the delayed items per-root, and then simply drop any delayed items for roots that we are going to delete. But for now just a quick and easy solution is the safest. Cc: stable(a)vger.kernel.org Signed-off-by: Josef Bacik <josef(a)toxicpanda.com> --- fs/btrfs/extent-tree.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index dcb699dd57f3..965702034b22 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -9330,6 +9330,8 @@ int btrfs_drop_snapshot(struct btrfs_root *root, goto out_free; } + btrfs_run_delayed_items(trans); + if (block_rsv) trans->block_rsv = block_rsv; -- 2.14.3

6 years, 10 months

2
2
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stable-rc/linux-4.19.y boot: 128 boots: 0 failed, 125 passed with 3 offline (v4.19.5-107-g048192fdfd84)

by kernelci.org bot

stable-rc/linux-4.19.y boot: 128 boots: 0 failed, 125 passed with 3 offline (v4.19.5-107-g048192fdfd84) Full Boot Summary: https://kernelci.org/boot/all/job/stable-rc/branch/linux-4.19.y/kernel/v4.1… Full Build Summary: https://kernelci.org/build/stable-rc/branch/linux-4.19.y/kernel/v4.19.5-107… Tree: stable-rc Branch: linux-4.19.y Git Describe: v4.19.5-107-g048192fdfd84 Git Commit: 048192fdfd8468e130937cd697f117a144fa71e9 Git URL: http://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git Tested: 66 unique boards, 23 SoC families, 15 builds out of 202 Offline Platforms: arm: multi_v7_defconfig: stih410-b2120: 1 offline lab arm64: defconfig: meson-gxl-s905d-p230: 1 offline lab meson-gxl-s905x-p212: 1 offline lab --- For more info write to <info(a)kernelci.org>

6 years, 10 months

1
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stable-rc/linux-4.9.y boot: 114 boots: 0 failed, 112 passed with 1 offline, 1 conflict (v4.9.141-91-gdc9fc9db643c)

by kernelci.org bot

stable-rc/linux-4.9.y boot: 114 boots: 0 failed, 112 passed with 1 offline, 1 conflict (v4.9.141-91-gdc9fc9db643c) Full Boot Summary: https://kernelci.org/boot/all/job/stable-rc/branch/linux-4.9.y/kernel/v4.9.… Full Build Summary: https://kernelci.org/build/stable-rc/branch/linux-4.9.y/kernel/v4.9.141-91-… Tree: stable-rc Branch: linux-4.9.y Git Describe: v4.9.141-91-gdc9fc9db643c Git Commit: dc9fc9db643c21aa7e4bdb297ebae94afed0a9e2 Git URL: http://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git Tested: 51 unique boards, 21 SoC families, 16 builds out of 193 Boot Regressions Detected: arm64: defconfig: meson-gxbb-p200: lab-baylibre: new failure (last pass: v4.9.141-93-gf46aebe62697) Offline Platforms: arm: multi_v7_defconfig: stih410-b2120: 1 offline lab Conflicting Boot Failure Detected: (These likely are not failures as other labs are reporting PASS. Needs review.) arm64: defconfig: meson-gxbb-p200: lab-baylibre: FAIL lab-baylibre-seattle: PASS --- For more info write to <info(a)kernelci.org>

6 years, 10 months

1
0
0 0

stable-rc/linux-4.4.y boot: 105 boots: 1 failed, 102 passed with 1 offline, 1 untried/unknown (v4.4.165-85-gf00ba91a41ec)

by kernelci.org bot

stable-rc/linux-4.4.y boot: 105 boots: 1 failed, 102 passed with 1 offline, 1 untried/unknown (v4.4.165-85-gf00ba91a41ec) Full Boot Summary: https://kernelci.org/boot/all/job/stable-rc/branch/linux-4.4.y/kernel/v4.4.… Full Build Summary: https://kernelci.org/build/stable-rc/branch/linux-4.4.y/kernel/v4.4.165-85-… Tree: stable-rc Branch: linux-4.4.y Git Describe: v4.4.165-85-gf00ba91a41ec Git Commit: f00ba91a41ec3c7d118e82e5d963c3b638dd458c Git URL: http://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git Tested: 46 unique boards, 20 SoC families, 15 builds out of 187 Boot Failure Detected: arm64: defconfig qcom-qdf2400: 1 failed lab Offline Platforms: arm: multi_v7_defconfig: stih410-b2120: 1 offline lab --- For more info write to <info(a)kernelci.org>

6 years, 10 months

1
0
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