August 2024 - Linux-stable-mirror

[PATCH] fuse: use unsigned type for getxattr/listxattr size truncation

by Jann Horn

The existing code uses min_t(ssize_t, outarg.size, XATTR_LIST_MAX) when parsing the FUSE daemon's response to a zero-length getxattr/listxattr request. On 32-bit kernels, where ssize_t and outarg.size are the same size, this is wrong: The min_t() will pass through any size values that are negative when interpreted as signed. fuse_listxattr() will then return this userspace-supplied negative value, which callers will treat as an error value. This kind of bug pattern can lead to fairly bad security bugs because of how error codes are used in the Linux kernel. If a caller were to convert the numeric error into an error pointer, like so: struct foo *func(...) { int len = fuse_getxattr(..., NULL, 0); if (len < 0) return ERR_PTR(len); ... } then it would end up returning this userspace-supplied negative value cast to a pointer - but the caller of this function wouldn't recognize it as an error pointer (IS_ERR_VALUE() only detects values in the narrow range in which legitimate errno values are), and so it would just be treated as a kernel pointer. I think there is at least one theoretical codepath where this could happen, but that path would involve virtio-fs with submounts plus some weird SELinux configuration, so I think it's probably not a concern in practice. Cc: stable(a)vger.kernel.org Fixes: 63401ccdb2ca ("fuse: limit xattr returned size") Signed-off-by: Jann Horn <jannh(a)google.com> --- fs/fuse/xattr.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/fuse/xattr.c b/fs/fuse/xattr.c index 5b423fdbb13f..9f568d345c51 100644 --- a/fs/fuse/xattr.c +++ b/fs/fuse/xattr.c @@ -81,7 +81,7 @@ ssize_t fuse_getxattr(struct inode *inode, const char *name, void *value, } ret = fuse_simple_request(fm, &args); if (!ret && !size) - ret = min_t(ssize_t, outarg.size, XATTR_SIZE_MAX); + ret = min_t(size_t, outarg.size, XATTR_SIZE_MAX); if (ret == -ENOSYS) { fm->fc->no_getxattr = 1; ret = -EOPNOTSUPP; @@ -143,7 +143,7 @@ ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size) } ret = fuse_simple_request(fm, &args); if (!ret && !size) - ret = min_t(ssize_t, outarg.size, XATTR_LIST_MAX); + ret = min_t(size_t, outarg.size, XATTR_LIST_MAX); if (ret > 0 && size) ret = fuse_verify_xattr_list(list, ret); if (ret == -ENOSYS) { --- base-commit: b0da640826ba3b6506b4996a6b23a429235e6923 change-id: 20240819-fuse-oob-error-fix-664d082176d5 -- Jann Horn <jannh(a)google.com>

10 months, 2 weeks

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FAILED: patch "[PATCH] mm/numa: no task_numa_fault() call if PTE is changed" failed to apply to 6.1-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 6.1-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.1.y git checkout FETCH_HEAD git cherry-pick -x 40b760cfd44566bca791c80e0720d70d75382b84 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2024081933-cheddar-oak-0777@gregkh' --subject-prefix 'PATCH 6.1.y' HEAD^.. Possible dependencies: 40b760cfd445 ("mm/numa: no task_numa_fault() call if PTE is changed") d2136d749d76 ("mm: support multi-size THP numa balancing") 6b0ed7b3c775 ("mm: factor out the numa mapping rebuilding into a new helper") ec1778807a80 ("mm: mprotect: use a folio in change_pte_range()") 6695cf68b15c ("mm: memory: use a folio in do_numa_page()") 73eab3ca481e ("mm: migrate: convert migrate_misplaced_page() to migrate_misplaced_folio()") 2ac9e99f3b21 ("mm: migrate: convert numamigrate_isolate_page() to numamigrate_isolate_folio()") df57721f9a63 ("Merge tag 'x86_shstk_for_6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip") thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From 40b760cfd44566bca791c80e0720d70d75382b84 Mon Sep 17 00:00:00 2001 From: Zi Yan <ziy(a)nvidia.com> Date: Fri, 9 Aug 2024 10:59:04 -0400 Subject: [PATCH] mm/numa: no task_numa_fault() call if PTE is changed When handling a numa page fault, task_numa_fault() should be called by a process that restores the page table of the faulted folio to avoid duplicated stats counting. Commit b99a342d4f11 ("NUMA balancing: reduce TLB flush via delaying mapping on hint page fault") restructured do_numa_page() and did not avoid task_numa_fault() call in the second page table check after a numa migration failure. Fix it by making all !pte_same() return immediately. This issue can cause task_numa_fault() being called more than necessary and lead to unexpected numa balancing results (It is hard to tell whether the issue will cause positive or negative performance impact due to duplicated numa fault counting). Link: https://lkml.kernel.org/r/20240809145906.1513458-2-ziy@nvidia.com Fixes: b99a342d4f11 ("NUMA balancing: reduce TLB flush via delaying mapping on hint page fault") Signed-off-by: Zi Yan <ziy(a)nvidia.com> Reported-by: "Huang, Ying" <ying.huang(a)intel.com> Closes: https://lore.kernel.org/linux-mm/87zfqfw0yw.fsf@yhuang6-desk2.ccr.corp.inte… Acked-by: David Hildenbrand <david(a)redhat.com> Cc: Baolin Wang <baolin.wang(a)linux.alibaba.com> Cc: Kefeng Wang <wangkefeng.wang(a)huawei.com> Cc: Mel Gorman <mgorman(a)suse.de> Cc: Yang Shi <shy828301(a)gmail.com> Cc: <stable(a)vger.kernel.org> Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org> diff --git a/mm/memory.c b/mm/memory.c index 34f8402d2046..3c01d68065be 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -5295,7 +5295,7 @@ static vm_fault_t do_numa_page(struct vm_fault *vmf) if (unlikely(!pte_same(old_pte, vmf->orig_pte))) { pte_unmap_unlock(vmf->pte, vmf->ptl); - goto out; + return 0; } pte = pte_modify(old_pte, vma->vm_page_prot); @@ -5358,23 +5358,19 @@ static vm_fault_t do_numa_page(struct vm_fault *vmf) if (!migrate_misplaced_folio(folio, vma, target_nid)) { nid = target_nid; flags |= TNF_MIGRATED; - } else { - flags |= TNF_MIGRATE_FAIL; - vmf->pte = pte_offset_map_lock(vma->vm_mm, vmf->pmd, - vmf->address, &vmf->ptl); - if (unlikely(!vmf->pte)) - goto out; - if (unlikely(!pte_same(ptep_get(vmf->pte), vmf->orig_pte))) { - pte_unmap_unlock(vmf->pte, vmf->ptl); - goto out; - } - goto out_map; + task_numa_fault(last_cpupid, nid, nr_pages, flags); + return 0; } -out: - if (nid != NUMA_NO_NODE) - task_numa_fault(last_cpupid, nid, nr_pages, flags); - return 0; + flags |= TNF_MIGRATE_FAIL; + vmf->pte = pte_offset_map_lock(vma->vm_mm, vmf->pmd, + vmf->address, &vmf->ptl); + if (unlikely(!vmf->pte)) + return 0; + if (unlikely(!pte_same(ptep_get(vmf->pte), vmf->orig_pte))) { + pte_unmap_unlock(vmf->pte, vmf->ptl); + return 0; + } out_map: /* * Make it present again, depending on how arch implements @@ -5387,7 +5383,10 @@ static vm_fault_t do_numa_page(struct vm_fault *vmf) numa_rebuild_single_mapping(vmf, vma, vmf->address, vmf->pte, writable); pte_unmap_unlock(vmf->pte, vmf->ptl); - goto out; + + if (nid != NUMA_NO_NODE) + task_numa_fault(last_cpupid, nid, nr_pages, flags); + return 0; } static inline vm_fault_t create_huge_pmd(struct vm_fault *vmf)

10 months, 2 weeks

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FAILED: patch "[PATCH] mm/numa: no task_numa_fault() call if PTE is changed" failed to apply to 6.6-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 6.6-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y git checkout FETCH_HEAD git cherry-pick -x 40b760cfd44566bca791c80e0720d70d75382b84 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2024081932-vastly-ice-7932@gregkh' --subject-prefix 'PATCH 6.6.y' HEAD^.. Possible dependencies: 40b760cfd445 ("mm/numa: no task_numa_fault() call if PTE is changed") d2136d749d76 ("mm: support multi-size THP numa balancing") 6b0ed7b3c775 ("mm: factor out the numa mapping rebuilding into a new helper") ec1778807a80 ("mm: mprotect: use a folio in change_pte_range()") 6695cf68b15c ("mm: memory: use a folio in do_numa_page()") 73eab3ca481e ("mm: migrate: convert migrate_misplaced_page() to migrate_misplaced_folio()") 2ac9e99f3b21 ("mm: migrate: convert numamigrate_isolate_page() to numamigrate_isolate_folio()") thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From 40b760cfd44566bca791c80e0720d70d75382b84 Mon Sep 17 00:00:00 2001 From: Zi Yan <ziy(a)nvidia.com> Date: Fri, 9 Aug 2024 10:59:04 -0400 Subject: [PATCH] mm/numa: no task_numa_fault() call if PTE is changed When handling a numa page fault, task_numa_fault() should be called by a process that restores the page table of the faulted folio to avoid duplicated stats counting. Commit b99a342d4f11 ("NUMA balancing: reduce TLB flush via delaying mapping on hint page fault") restructured do_numa_page() and did not avoid task_numa_fault() call in the second page table check after a numa migration failure. Fix it by making all !pte_same() return immediately. This issue can cause task_numa_fault() being called more than necessary and lead to unexpected numa balancing results (It is hard to tell whether the issue will cause positive or negative performance impact due to duplicated numa fault counting). Link: https://lkml.kernel.org/r/20240809145906.1513458-2-ziy@nvidia.com Fixes: b99a342d4f11 ("NUMA balancing: reduce TLB flush via delaying mapping on hint page fault") Signed-off-by: Zi Yan <ziy(a)nvidia.com> Reported-by: "Huang, Ying" <ying.huang(a)intel.com> Closes: https://lore.kernel.org/linux-mm/87zfqfw0yw.fsf@yhuang6-desk2.ccr.corp.inte… Acked-by: David Hildenbrand <david(a)redhat.com> Cc: Baolin Wang <baolin.wang(a)linux.alibaba.com> Cc: Kefeng Wang <wangkefeng.wang(a)huawei.com> Cc: Mel Gorman <mgorman(a)suse.de> Cc: Yang Shi <shy828301(a)gmail.com> Cc: <stable(a)vger.kernel.org> Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org> diff --git a/mm/memory.c b/mm/memory.c index 34f8402d2046..3c01d68065be 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -5295,7 +5295,7 @@ static vm_fault_t do_numa_page(struct vm_fault *vmf) if (unlikely(!pte_same(old_pte, vmf->orig_pte))) { pte_unmap_unlock(vmf->pte, vmf->ptl); - goto out; + return 0; } pte = pte_modify(old_pte, vma->vm_page_prot); @@ -5358,23 +5358,19 @@ static vm_fault_t do_numa_page(struct vm_fault *vmf) if (!migrate_misplaced_folio(folio, vma, target_nid)) { nid = target_nid; flags |= TNF_MIGRATED; - } else { - flags |= TNF_MIGRATE_FAIL; - vmf->pte = pte_offset_map_lock(vma->vm_mm, vmf->pmd, - vmf->address, &vmf->ptl); - if (unlikely(!vmf->pte)) - goto out; - if (unlikely(!pte_same(ptep_get(vmf->pte), vmf->orig_pte))) { - pte_unmap_unlock(vmf->pte, vmf->ptl); - goto out; - } - goto out_map; + task_numa_fault(last_cpupid, nid, nr_pages, flags); + return 0; } -out: - if (nid != NUMA_NO_NODE) - task_numa_fault(last_cpupid, nid, nr_pages, flags); - return 0; + flags |= TNF_MIGRATE_FAIL; + vmf->pte = pte_offset_map_lock(vma->vm_mm, vmf->pmd, + vmf->address, &vmf->ptl); + if (unlikely(!vmf->pte)) + return 0; + if (unlikely(!pte_same(ptep_get(vmf->pte), vmf->orig_pte))) { + pte_unmap_unlock(vmf->pte, vmf->ptl); + return 0; + } out_map: /* * Make it present again, depending on how arch implements @@ -5387,7 +5383,10 @@ static vm_fault_t do_numa_page(struct vm_fault *vmf) numa_rebuild_single_mapping(vmf, vma, vmf->address, vmf->pte, writable); pte_unmap_unlock(vmf->pte, vmf->ptl); - goto out; + + if (nid != NUMA_NO_NODE) + task_numa_fault(last_cpupid, nid, nr_pages, flags); + return 0; } static inline vm_fault_t create_huge_pmd(struct vm_fault *vmf)

10 months, 2 weeks

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FAILED: patch "[PATCH] mm/numa: no task_numa_fault() call if PMD is changed" failed to apply to 5.15-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y git checkout FETCH_HEAD git cherry-pick -x fd8c35a92910f4829b7c99841f39b1b952c259d5 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2024081953-corncob-gab-6fce@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^.. Possible dependencies: fd8c35a92910 ("mm/numa: no task_numa_fault() call if PMD is changed") 667ffc31aa95 ("mm: huge_memory: use a folio in do_huge_pmd_numa_page()") 73eab3ca481e ("mm: migrate: convert migrate_misplaced_page() to migrate_misplaced_folio()") 2ac9e99f3b21 ("mm: migrate: convert numamigrate_isolate_page() to numamigrate_isolate_folio()") 4e096ae1801e ("mm: convert migrate_pages() to work on folios") 2ef7dbb26990 ("migrate_pages: try migrate in batch asynchronously firstly") a21d2133215b ("migrate_pages: move split folios processing out of migrate_pages_batch()") fb3592c41a44 ("migrate_pages: fix deadlock in batched migration") f9366f4c2a29 ("include/linux/migrate.h: remove unneeded externs") cd7755800eb5 ("mm: change to return bool for isolate_movable_page()") f7f9c00dfaff ("mm: change to return bool for isolate_lru_page()") be2d57563822 ("mm: change to return bool for folio_isolate_lru()") 6f7d760e86fa ("migrate_pages: move THP/hugetlb migration support check to simplify code") 7e12beb8ca2a ("migrate_pages: batch flushing TLB") ebe75e475106 ("migrate_pages: share more code between _unmap and _move") 80562ba0d837 ("migrate_pages: move migrate_folio_unmap()") 5dfab109d519 ("migrate_pages: batch _unmap and _move") 64c8902ed441 ("migrate_pages: split unmap_and_move() to _unmap() and _move()") 42012e0436d4 ("migrate_pages: restrict number of pages to migrate in batch") e5bfff8b10e4 ("migrate_pages: separate hugetlb folios migration") thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From fd8c35a92910f4829b7c99841f39b1b952c259d5 Mon Sep 17 00:00:00 2001 From: Zi Yan <ziy(a)nvidia.com> Date: Fri, 9 Aug 2024 10:59:05 -0400 Subject: [PATCH] mm/numa: no task_numa_fault() call if PMD is changed When handling a numa page fault, task_numa_fault() should be called by a process that restores the page table of the faulted folio to avoid duplicated stats counting. Commit c5b5a3dd2c1f ("mm: thp: refactor NUMA fault handling") restructured do_huge_pmd_numa_page() and did not avoid task_numa_fault() call in the second page table check after a numa migration failure. Fix it by making all !pmd_same() return immediately. This issue can cause task_numa_fault() being called more than necessary and lead to unexpected numa balancing results (It is hard to tell whether the issue will cause positive or negative performance impact due to duplicated numa fault counting). Link: https://lkml.kernel.org/r/20240809145906.1513458-3-ziy@nvidia.com Fixes: c5b5a3dd2c1f ("mm: thp: refactor NUMA fault handling") Reported-by: "Huang, Ying" <ying.huang(a)intel.com> Closes: https://lore.kernel.org/linux-mm/87zfqfw0yw.fsf@yhuang6-desk2.ccr.corp.inte… Signed-off-by: Zi Yan <ziy(a)nvidia.com> Acked-by: David Hildenbrand <david(a)redhat.com> Cc: Baolin Wang <baolin.wang(a)linux.alibaba.com> Cc: "Huang, Ying" <ying.huang(a)intel.com> Cc: Kefeng Wang <wangkefeng.wang(a)huawei.com> Cc: Mel Gorman <mgorman(a)suse.de> Cc: Yang Shi <shy828301(a)gmail.com> Cc: <stable(a)vger.kernel.org> Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org> diff --git a/mm/huge_memory.c b/mm/huge_memory.c index f4be468e06a4..67c86a5d64a6 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1685,7 +1685,7 @@ vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf) vmf->ptl = pmd_lock(vma->vm_mm, vmf->pmd); if (unlikely(!pmd_same(oldpmd, *vmf->pmd))) { spin_unlock(vmf->ptl); - goto out; + return 0; } pmd = pmd_modify(oldpmd, vma->vm_page_prot); @@ -1728,22 +1728,16 @@ vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf) if (!migrate_misplaced_folio(folio, vma, target_nid)) { flags |= TNF_MIGRATED; nid = target_nid; - } else { - flags |= TNF_MIGRATE_FAIL; - vmf->ptl = pmd_lock(vma->vm_mm, vmf->pmd); - if (unlikely(!pmd_same(oldpmd, *vmf->pmd))) { - spin_unlock(vmf->ptl); - goto out; - } - goto out_map; + task_numa_fault(last_cpupid, nid, HPAGE_PMD_NR, flags); + return 0; } -out: - if (nid != NUMA_NO_NODE) - task_numa_fault(last_cpupid, nid, HPAGE_PMD_NR, flags); - - return 0; - + flags |= TNF_MIGRATE_FAIL; + vmf->ptl = pmd_lock(vma->vm_mm, vmf->pmd); + if (unlikely(!pmd_same(oldpmd, *vmf->pmd))) { + spin_unlock(vmf->ptl); + return 0; + } out_map: /* Restore the PMD */ pmd = pmd_modify(oldpmd, vma->vm_page_prot); @@ -1753,7 +1747,10 @@ vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf) set_pmd_at(vma->vm_mm, haddr, vmf->pmd, pmd); update_mmu_cache_pmd(vma, vmf->address, vmf->pmd); spin_unlock(vmf->ptl); - goto out; + + if (nid != NUMA_NO_NODE) + task_numa_fault(last_cpupid, nid, HPAGE_PMD_NR, flags); + return 0; } /*

10 months, 2 weeks

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FAILED: patch "[PATCH] mm/numa: no task_numa_fault() call if PMD is changed" failed to apply to 6.1-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 6.1-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.1.y git checkout FETCH_HEAD git cherry-pick -x fd8c35a92910f4829b7c99841f39b1b952c259d5 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2024081952-handstand-rematch-5948@gregkh' --subject-prefix 'PATCH 6.1.y' HEAD^.. Possible dependencies: fd8c35a92910 ("mm/numa: no task_numa_fault() call if PMD is changed") 667ffc31aa95 ("mm: huge_memory: use a folio in do_huge_pmd_numa_page()") 73eab3ca481e ("mm: migrate: convert migrate_misplaced_page() to migrate_misplaced_folio()") 2ac9e99f3b21 ("mm: migrate: convert numamigrate_isolate_page() to numamigrate_isolate_folio()") 4e096ae1801e ("mm: convert migrate_pages() to work on folios") 2ef7dbb26990 ("migrate_pages: try migrate in batch asynchronously firstly") a21d2133215b ("migrate_pages: move split folios processing out of migrate_pages_batch()") fb3592c41a44 ("migrate_pages: fix deadlock in batched migration") f9366f4c2a29 ("include/linux/migrate.h: remove unneeded externs") cd7755800eb5 ("mm: change to return bool for isolate_movable_page()") f7f9c00dfaff ("mm: change to return bool for isolate_lru_page()") be2d57563822 ("mm: change to return bool for folio_isolate_lru()") 6f7d760e86fa ("migrate_pages: move THP/hugetlb migration support check to simplify code") 7e12beb8ca2a ("migrate_pages: batch flushing TLB") ebe75e475106 ("migrate_pages: share more code between _unmap and _move") 80562ba0d837 ("migrate_pages: move migrate_folio_unmap()") 5dfab109d519 ("migrate_pages: batch _unmap and _move") 64c8902ed441 ("migrate_pages: split unmap_and_move() to _unmap() and _move()") 42012e0436d4 ("migrate_pages: restrict number of pages to migrate in batch") e5bfff8b10e4 ("migrate_pages: separate hugetlb folios migration") thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From fd8c35a92910f4829b7c99841f39b1b952c259d5 Mon Sep 17 00:00:00 2001 From: Zi Yan <ziy(a)nvidia.com> Date: Fri, 9 Aug 2024 10:59:05 -0400 Subject: [PATCH] mm/numa: no task_numa_fault() call if PMD is changed When handling a numa page fault, task_numa_fault() should be called by a process that restores the page table of the faulted folio to avoid duplicated stats counting. Commit c5b5a3dd2c1f ("mm: thp: refactor NUMA fault handling") restructured do_huge_pmd_numa_page() and did not avoid task_numa_fault() call in the second page table check after a numa migration failure. Fix it by making all !pmd_same() return immediately. This issue can cause task_numa_fault() being called more than necessary and lead to unexpected numa balancing results (It is hard to tell whether the issue will cause positive or negative performance impact due to duplicated numa fault counting). Link: https://lkml.kernel.org/r/20240809145906.1513458-3-ziy@nvidia.com Fixes: c5b5a3dd2c1f ("mm: thp: refactor NUMA fault handling") Reported-by: "Huang, Ying" <ying.huang(a)intel.com> Closes: https://lore.kernel.org/linux-mm/87zfqfw0yw.fsf@yhuang6-desk2.ccr.corp.inte… Signed-off-by: Zi Yan <ziy(a)nvidia.com> Acked-by: David Hildenbrand <david(a)redhat.com> Cc: Baolin Wang <baolin.wang(a)linux.alibaba.com> Cc: "Huang, Ying" <ying.huang(a)intel.com> Cc: Kefeng Wang <wangkefeng.wang(a)huawei.com> Cc: Mel Gorman <mgorman(a)suse.de> Cc: Yang Shi <shy828301(a)gmail.com> Cc: <stable(a)vger.kernel.org> Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org> diff --git a/mm/huge_memory.c b/mm/huge_memory.c index f4be468e06a4..67c86a5d64a6 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1685,7 +1685,7 @@ vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf) vmf->ptl = pmd_lock(vma->vm_mm, vmf->pmd); if (unlikely(!pmd_same(oldpmd, *vmf->pmd))) { spin_unlock(vmf->ptl); - goto out; + return 0; } pmd = pmd_modify(oldpmd, vma->vm_page_prot); @@ -1728,22 +1728,16 @@ vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf) if (!migrate_misplaced_folio(folio, vma, target_nid)) { flags |= TNF_MIGRATED; nid = target_nid; - } else { - flags |= TNF_MIGRATE_FAIL; - vmf->ptl = pmd_lock(vma->vm_mm, vmf->pmd); - if (unlikely(!pmd_same(oldpmd, *vmf->pmd))) { - spin_unlock(vmf->ptl); - goto out; - } - goto out_map; + task_numa_fault(last_cpupid, nid, HPAGE_PMD_NR, flags); + return 0; } -out: - if (nid != NUMA_NO_NODE) - task_numa_fault(last_cpupid, nid, HPAGE_PMD_NR, flags); - - return 0; - + flags |= TNF_MIGRATE_FAIL; + vmf->ptl = pmd_lock(vma->vm_mm, vmf->pmd); + if (unlikely(!pmd_same(oldpmd, *vmf->pmd))) { + spin_unlock(vmf->ptl); + return 0; + } out_map: /* Restore the PMD */ pmd = pmd_modify(oldpmd, vma->vm_page_prot); @@ -1753,7 +1747,10 @@ vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf) set_pmd_at(vma->vm_mm, haddr, vmf->pmd, pmd); update_mmu_cache_pmd(vma, vmf->address, vmf->pmd); spin_unlock(vmf->ptl); - goto out; + + if (nid != NUMA_NO_NODE) + task_numa_fault(last_cpupid, nid, HPAGE_PMD_NR, flags); + return 0; } /*

10 months, 2 weeks

2
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FAILED: patch "[PATCH] mm/numa: no task_numa_fault() call if PMD is changed" failed to apply to 6.6-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 6.6-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y git checkout FETCH_HEAD git cherry-pick -x fd8c35a92910f4829b7c99841f39b1b952c259d5 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2024081951-fable-brewery-9048@gregkh' --subject-prefix 'PATCH 6.6.y' HEAD^.. Possible dependencies: fd8c35a92910 ("mm/numa: no task_numa_fault() call if PMD is changed") 667ffc31aa95 ("mm: huge_memory: use a folio in do_huge_pmd_numa_page()") 73eab3ca481e ("mm: migrate: convert migrate_misplaced_page() to migrate_misplaced_folio()") 2ac9e99f3b21 ("mm: migrate: convert numamigrate_isolate_page() to numamigrate_isolate_folio()") thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From fd8c35a92910f4829b7c99841f39b1b952c259d5 Mon Sep 17 00:00:00 2001 From: Zi Yan <ziy(a)nvidia.com> Date: Fri, 9 Aug 2024 10:59:05 -0400 Subject: [PATCH] mm/numa: no task_numa_fault() call if PMD is changed When handling a numa page fault, task_numa_fault() should be called by a process that restores the page table of the faulted folio to avoid duplicated stats counting. Commit c5b5a3dd2c1f ("mm: thp: refactor NUMA fault handling") restructured do_huge_pmd_numa_page() and did not avoid task_numa_fault() call in the second page table check after a numa migration failure. Fix it by making all !pmd_same() return immediately. This issue can cause task_numa_fault() being called more than necessary and lead to unexpected numa balancing results (It is hard to tell whether the issue will cause positive or negative performance impact due to duplicated numa fault counting). Link: https://lkml.kernel.org/r/20240809145906.1513458-3-ziy@nvidia.com Fixes: c5b5a3dd2c1f ("mm: thp: refactor NUMA fault handling") Reported-by: "Huang, Ying" <ying.huang(a)intel.com> Closes: https://lore.kernel.org/linux-mm/87zfqfw0yw.fsf@yhuang6-desk2.ccr.corp.inte… Signed-off-by: Zi Yan <ziy(a)nvidia.com> Acked-by: David Hildenbrand <david(a)redhat.com> Cc: Baolin Wang <baolin.wang(a)linux.alibaba.com> Cc: "Huang, Ying" <ying.huang(a)intel.com> Cc: Kefeng Wang <wangkefeng.wang(a)huawei.com> Cc: Mel Gorman <mgorman(a)suse.de> Cc: Yang Shi <shy828301(a)gmail.com> Cc: <stable(a)vger.kernel.org> Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org> diff --git a/mm/huge_memory.c b/mm/huge_memory.c index f4be468e06a4..67c86a5d64a6 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1685,7 +1685,7 @@ vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf) vmf->ptl = pmd_lock(vma->vm_mm, vmf->pmd); if (unlikely(!pmd_same(oldpmd, *vmf->pmd))) { spin_unlock(vmf->ptl); - goto out; + return 0; } pmd = pmd_modify(oldpmd, vma->vm_page_prot); @@ -1728,22 +1728,16 @@ vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf) if (!migrate_misplaced_folio(folio, vma, target_nid)) { flags |= TNF_MIGRATED; nid = target_nid; - } else { - flags |= TNF_MIGRATE_FAIL; - vmf->ptl = pmd_lock(vma->vm_mm, vmf->pmd); - if (unlikely(!pmd_same(oldpmd, *vmf->pmd))) { - spin_unlock(vmf->ptl); - goto out; - } - goto out_map; + task_numa_fault(last_cpupid, nid, HPAGE_PMD_NR, flags); + return 0; } -out: - if (nid != NUMA_NO_NODE) - task_numa_fault(last_cpupid, nid, HPAGE_PMD_NR, flags); - - return 0; - + flags |= TNF_MIGRATE_FAIL; + vmf->ptl = pmd_lock(vma->vm_mm, vmf->pmd); + if (unlikely(!pmd_same(oldpmd, *vmf->pmd))) { + spin_unlock(vmf->ptl); + return 0; + } out_map: /* Restore the PMD */ pmd = pmd_modify(oldpmd, vma->vm_page_prot); @@ -1753,7 +1747,10 @@ vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf) set_pmd_at(vma->vm_mm, haddr, vmf->pmd, pmd); update_mmu_cache_pmd(vma, vmf->address, vmf->pmd); spin_unlock(vmf->ptl); - goto out; + + if (nid != NUMA_NO_NODE) + task_numa_fault(last_cpupid, nid, HPAGE_PMD_NR, flags); + return 0; } /*

10 months, 2 weeks

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FAILED: patch "[PATCH] mm/numa: no task_numa_fault() call if PMD is changed" failed to apply to 6.10-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 6.10-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.10.y git checkout FETCH_HEAD git cherry-pick -x fd8c35a92910f4829b7c99841f39b1b952c259d5 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable(a)vger.kernel.org>' --in-reply-to '2024081950-jolliness-crux-7fe1@gregkh' --subject-prefix 'PATCH 6.10.y' HEAD^.. Possible dependencies: fd8c35a92910 ("mm/numa: no task_numa_fault() call if PMD is changed") thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From fd8c35a92910f4829b7c99841f39b1b952c259d5 Mon Sep 17 00:00:00 2001 From: Zi Yan <ziy(a)nvidia.com> Date: Fri, 9 Aug 2024 10:59:05 -0400 Subject: [PATCH] mm/numa: no task_numa_fault() call if PMD is changed When handling a numa page fault, task_numa_fault() should be called by a process that restores the page table of the faulted folio to avoid duplicated stats counting. Commit c5b5a3dd2c1f ("mm: thp: refactor NUMA fault handling") restructured do_huge_pmd_numa_page() and did not avoid task_numa_fault() call in the second page table check after a numa migration failure. Fix it by making all !pmd_same() return immediately. This issue can cause task_numa_fault() being called more than necessary and lead to unexpected numa balancing results (It is hard to tell whether the issue will cause positive or negative performance impact due to duplicated numa fault counting). Link: https://lkml.kernel.org/r/20240809145906.1513458-3-ziy@nvidia.com Fixes: c5b5a3dd2c1f ("mm: thp: refactor NUMA fault handling") Reported-by: "Huang, Ying" <ying.huang(a)intel.com> Closes: https://lore.kernel.org/linux-mm/87zfqfw0yw.fsf@yhuang6-desk2.ccr.corp.inte… Signed-off-by: Zi Yan <ziy(a)nvidia.com> Acked-by: David Hildenbrand <david(a)redhat.com> Cc: Baolin Wang <baolin.wang(a)linux.alibaba.com> Cc: "Huang, Ying" <ying.huang(a)intel.com> Cc: Kefeng Wang <wangkefeng.wang(a)huawei.com> Cc: Mel Gorman <mgorman(a)suse.de> Cc: Yang Shi <shy828301(a)gmail.com> Cc: <stable(a)vger.kernel.org> Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org> diff --git a/mm/huge_memory.c b/mm/huge_memory.c index f4be468e06a4..67c86a5d64a6 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1685,7 +1685,7 @@ vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf) vmf->ptl = pmd_lock(vma->vm_mm, vmf->pmd); if (unlikely(!pmd_same(oldpmd, *vmf->pmd))) { spin_unlock(vmf->ptl); - goto out; + return 0; } pmd = pmd_modify(oldpmd, vma->vm_page_prot); @@ -1728,22 +1728,16 @@ vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf) if (!migrate_misplaced_folio(folio, vma, target_nid)) { flags |= TNF_MIGRATED; nid = target_nid; - } else { - flags |= TNF_MIGRATE_FAIL; - vmf->ptl = pmd_lock(vma->vm_mm, vmf->pmd); - if (unlikely(!pmd_same(oldpmd, *vmf->pmd))) { - spin_unlock(vmf->ptl); - goto out; - } - goto out_map; + task_numa_fault(last_cpupid, nid, HPAGE_PMD_NR, flags); + return 0; } -out: - if (nid != NUMA_NO_NODE) - task_numa_fault(last_cpupid, nid, HPAGE_PMD_NR, flags); - - return 0; - + flags |= TNF_MIGRATE_FAIL; + vmf->ptl = pmd_lock(vma->vm_mm, vmf->pmd); + if (unlikely(!pmd_same(oldpmd, *vmf->pmd))) { + spin_unlock(vmf->ptl); + return 0; + } out_map: /* Restore the PMD */ pmd = pmd_modify(oldpmd, vma->vm_page_prot); @@ -1753,7 +1747,10 @@ vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf) set_pmd_at(vma->vm_mm, haddr, vmf->pmd, pmd); update_mmu_cache_pmd(vma, vmf->address, vmf->pmd); spin_unlock(vmf->ptl); - goto out; + + if (nid != NUMA_NO_NODE) + task_numa_fault(last_cpupid, nid, HPAGE_PMD_NR, flags); + return 0; } /*

10 months, 2 weeks

2
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Re: Patch "serial: pch: Don't disable interrupts while acquiring lock in ISR." has been added to the 6.6-stable tree

by Sebastian Andrzej Siewior

On 2024-08-21 09:34:36 [-0400], Sasha Levin wrote: > This is a note to let you know that I've just added the patch titled > > serial: pch: Don't disable interrupts while acquiring lock in ISR. > > to the 6.6-stable tree which can be found at: > http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum… > > The filename of the patch is: > serial-pch-don-t-disable-interrupts-while-acquiring-.patch > and it can be found in the queue-6.6 subdirectory. > > If you, or anyone else, feels it should not be added to the stable tree, > please let <stable(a)vger.kernel.org> know about it. I don't think this needs to be backported. It was part of a cleanup series. It is not wrong, but also not needed. Unless it is needed as a dependency for another patch, I wouldn't bother. Sebastian

10 months, 2 weeks

1
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[v3] usb: dwc3: Avoid waking up gadget during startxfer

by Prashanth K

When operating in High-Speed, it is observed that DSTS[USBLNKST] doesn't update link state immediately after receiving the wakeup interrupt. Since wakeup event handler calls the resume callbacks, there is a chance that function drivers can perform an ep queue, which in turn tries to perform remote wakeup from send_gadget_ep_cmd(STARTXFER). This happens because DSTS[[21:18] wasn't updated to U0 yet, it's observed that the latency of DSTS can be in order of milli-seconds. Hence avoid calling gadget_wakeup during startxfer to prevent unnecessarily issuing remote wakeup to host. Fixes: c36d8e947a56 ("usb: dwc3: gadget: put link to U0 before Start Transfer") Cc: <stable(a)vger.kernel.org> Suggested-by: Thinh Nguyen <Thinh.Nguyen(a)synopsys.com> Signed-off-by: Prashanth K <quic_prashk(a)quicinc.com> --- v3: Added notes on top the function definition. v2: Refactored the patch as suggested in v1 discussion. drivers/usb/dwc3/gadget.c | 31 +++++++------------------------ 1 file changed, 7 insertions(+), 24 deletions(-) diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index 89fc690fdf34..d4f2f0e1f031 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -287,6 +287,13 @@ static int __dwc3_gadget_wakeup(struct dwc3 *dwc, bool async); * * Caller should handle locking. This function will issue @cmd with given * @params to @dep and wait for its completion. + * + * According to databook, if the link is in L1/L2/U3 while issuing StartXfer command, + * software must bring the link back to L0/U0 by performing remote wakeup. But we don't + * expect ep_queue to trigger a remote wakeup; instead it should be done by wakeup ops. + * + * After receiving wakeup event, device should no longer be in U3, and any link + * transition afterwards needs to be adressed with wakeup ops. */ int dwc3_send_gadget_ep_cmd(struct dwc3_ep *dep, unsigned int cmd, struct dwc3_gadget_ep_cmd_params *params) @@ -327,30 +334,6 @@ int dwc3_send_gadget_ep_cmd(struct dwc3_ep *dep, unsigned int cmd, dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg); } - if (DWC3_DEPCMD_CMD(cmd) == DWC3_DEPCMD_STARTTRANSFER) { - int link_state; - - /* - * Initiate remote wakeup if the link state is in U3 when - * operating in SS/SSP or L1/L2 when operating in HS/FS. If the - * link state is in U1/U2, no remote wakeup is needed. The Start - * Transfer command will initiate the link recovery. - */ - link_state = dwc3_gadget_get_link_state(dwc); - switch (link_state) { - case DWC3_LINK_STATE_U2: - if (dwc->gadget->speed >= USB_SPEED_SUPER) - break; - - fallthrough; - case DWC3_LINK_STATE_U3: - ret = __dwc3_gadget_wakeup(dwc, false); - dev_WARN_ONCE(dwc->dev, ret, "wakeup failed --> %d\n", - ret); - break; - } - } - /* * For some commands such as Update Transfer command, DEPCMDPARn * registers are reserved. Since the driver often sends Update Transfer -- 2.25.1

10 months, 2 weeks

2
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[PATCH v2 7/9] vdpa: solidrun: Fix potential UB bug with devres

by Philipp Stanner

In psnet_open_pf_bar() a string later passed to pcim_iomap_regions() is placed on the stack. Neither pcim_iomap_regions() nor the functions it calls copy that string. Should the string later ever be used, this, consequently, causes undefined behavior since the stack frame will by then have disappeared. Fix the bug by allocating the string on the heap through devm_kasprintf(). Cc: stable(a)vger.kernel.org # v6.3 Fixes: 51a8f9d7f587 ("virtio: vdpa: new SolidNET DPU driver.") Reported-by: Christophe JAILLET <christophe.jaillet(a)wanadoo.fr> Closes: https://lore.kernel.org/all/74e9109a-ac59-49e2-9b1d-d825c9c9f891@wanadoo.fr/ Suggested-by: Andy Shevchenko <andy(a)kernel.org> Signed-off-by: Philipp Stanner <pstanner(a)redhat.com> --- drivers/vdpa/solidrun/snet_main.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/vdpa/solidrun/snet_main.c b/drivers/vdpa/solidrun/snet_main.c index 99428a04068d..4d42a05d70fc 100644 --- a/drivers/vdpa/solidrun/snet_main.c +++ b/drivers/vdpa/solidrun/snet_main.c @@ -555,7 +555,7 @@ static const struct vdpa_config_ops snet_config_ops = { static int psnet_open_pf_bar(struct pci_dev *pdev, struct psnet *psnet) { - char name[50]; + char *name; int ret, i, mask = 0; /* We don't know which BAR will be used to communicate.. * We will map every bar with len > 0. @@ -573,7 +573,10 @@ static int psnet_open_pf_bar(struct pci_dev *pdev, struct psnet *psnet) return -ENODEV; } - snprintf(name, sizeof(name), "psnet[%s]-bars", pci_name(pdev)); + name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "psnet[%s]-bars", pci_name(pdev)); + if (!name) + return -ENOMEM; + ret = pcim_iomap_regions(pdev, mask, name); if (ret) { SNET_ERR(pdev, "Failed to request and map PCI BARs\n"); -- 2.46.0

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