- 19 Apr, 2019 16 commits
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Andrea Arcangeli authored
The core dumping code has always run without holding the mmap_sem for writing, despite that is the only way to ensure that the entire vma layout will not change from under it. Only using some signal serialization on the processes belonging to the mm is not nearly enough. This was pointed out earlier. For example in Hugh's post from Jul 2017: https://lkml.kernel.org/r/alpine.LSU.2.11.1707191716030.2055@eggly.anvils "Not strictly relevant here, but a related note: I was very surprised to discover, only quite recently, how handle_mm_fault() may be called without down_read(mmap_sem) - when core dumping. That seems a misguided optimization to me, which would also be nice to correct" In particular because the growsdown and growsup can move the vm_start/vm_end the various loops the core dump does around the vma will not be consistent if page faults can happen concurrently. Pretty much all users calling mmget_not_zero()/get_task_mm() and then taking the mmap_sem had the potential to introduce unexpected side effects in the core dumping code. Adding mmap_sem for writing around the ->core_dump invocation is a viable long term fix, but it requires removing all copy user and page faults and to replace them with get_dump_page() for all binary formats which is not suitable as a short term fix. For the time being this solution manually covers the places that can confuse the core dump either by altering the vma layout or the vma flags while it runs. Once ->core_dump runs under mmap_sem for writing the function mmget_still_valid() can be dropped. Allowing mmap_sem protected sections to run in parallel with the coredump provides some minor parallelism advantage to the swapoff code (which seems to be safe enough by never mangling any vma field and can keep doing swapins in parallel to the core dumping) and to some other corner case. In order to facilitate the backporting I added "Fixes: 86039bd3" however the side effect of this same race condition in /proc/pid/mem should be reproducible since before 2.6.12-rc2 so I couldn't add any other "Fixes:" because there's no hash beyond the git genesis commit. Because find_extend_vma() is the only location outside of the process context that could modify the "mm" structures under mmap_sem for reading, by adding the mmget_still_valid() check to it, all other cases that take the mmap_sem for reading don't need the new check after mmget_not_zero()/get_task_mm(). The expand_stack() in page fault context also doesn't need the new check, because all tasks under core dumping are frozen. Link: http://lkml.kernel.org/r/20190325224949.11068-1-aarcange@redhat.com Fixes: 86039bd3 ("userfaultfd: add new syscall to provide memory externalization") Signed-off-by:
Andrea Arcangeli <aarcange@redhat.com> Reported-by:
Jann Horn <jannh@google.com> Suggested-by:
Oleg Nesterov <oleg@redhat.com> Acked-by:
Peter Xu <peterx@redhat.com> Reviewed-by:
Mike Rapoport <rppt@linux.ibm.com> Reviewed-by:
Jason Gunthorpe <jgg@mellanox.com> Acked-by:
Michal Hocko <mhocko@suse.com> Cc: <stable@vger.kernel.org> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Arnd Bergmann authored
The only references outside of the #ifdef have been removed, so now we get a warning in non-SMP configurations: mm/kmemleak.c:1404:13: error: unused function 'scan_large_block' [-Werror,-Wunused-function] Add a new #ifdef around it. Link: http://lkml.kernel.org/r/20190416123148.3502045-1-arnd@arndb.de Fixes: 298a32b1 ("kmemleak: powerpc: skip scanning holes in the .bss section") Signed-off-by:
Arnd Bergmann <arnd@arndb.de> Acked-by:
Catalin Marinas <catalin.marinas@arm.com> Cc: Vincent Whitchurch <vincent.whitchurch@axis.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by:
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Dan Williams authored
When a module option, or core kernel argument, toggles a static-key it requires jump labels to be initialized early. While x86, PowerPC, and ARM64 arrange for jump_label_init() to be called before parse_args(), ARM does not. Kernel command line: rdinit=/sbin/init page_alloc.shuffle=1 panic=-1 console=ttyAMA0,115200 page_alloc.shuffle=1 ------------[ cut here ]------------ WARNING: CPU: 0 PID: 0 at ./include/linux/jump_label.h:303 page_alloc_shuffle+0x12c/0x1ac static_key_enable(): static key 'page_alloc_shuffle_key+0x0/0x4' used before call to jump_label_init() Modules linked in: CPU: 0 PID: 0 Comm: swapper Not tainted 5.1.0-rc4-next-20190410-00003-g3367c36ce744 #1 Hardware name: ARM Integrator/CP (Device Tree) [<c0011c68>] (unwind_backtrace) from [<c000ec48>] (show_stack+0x10/0x18) [<c000ec48>] (show_stack) from [<c07e9710>] (dump_stack+0x18/0x24) [<c07e9710>] (dump_stack) from [<c001bb1c>] (__warn+0xe0/0x108) [<c001bb1c>] (__warn) from [<c001bb88>] (warn_slowpath_fmt+0x44/0x6c) [<c001bb88>] (warn_slowpath_fmt) from [<c0b0c4a8>] (page_alloc_shuffle+0x12c/0x1ac) [<c0b0c4a8>] (page_alloc_shuffle) from [<c0b0c550>] (shuffle_store+0x28/0x48) [<c0b0c550>] (shuffle_store) from [<c003e6a0>] (parse_args+0x1f4/0x350) [<c003e6a0>] (parse_args) from [<c0ac3c00>] (start_kernel+0x1c0/0x488) Move the fallback call to jump_label_init() to occur before parse_args(). The redundant calls to jump_label_init() in other archs are left intact in case they have static key toggling use cases that are even earlier than option parsing. Link: http://lkml.kernel.org/r/155544804466.1032396.13418949511615676665.stgit@dwillia2-desk3.amr.corp.intel.comSigned-off-by:
Dan Williams <dan.j.williams@intel.com> Reported-by:
Guenter Roeck <groeck@google.com> Reviewed-by:
Kees Cook <keescook@chromium.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Mike Rapoport <rppt@linux.ibm.com> Cc: Russell King <rmk@armlinux.org.uk> Signed-off-by:
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Sergey Senozhatsky authored
Separate print_modules() and hard lockup error message. Before the patch: NMI watchdog: Watchdog detected hard LOCKUP on cpu 1Modules linked in: nls_cp437 Link: http://lkml.kernel.org/r/20190412062557.2700-1-sergey.senozhatsky@gmail.comSigned-off-by:
Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Signed-off-by:
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Mark Rutland authored
The help text for CONFIG_ARCH_HAS_KCOV is stale, and describes the feature as being enabled only for x86_64, when it is now enabled for several architectures, including arm, arm64, powerpc, and s390. Let's remove that stale help text, and update it along the lines of hat for ARCH_HAS_FORTIFY_SOURCE, better describing when an architecture should select CONFIG_ARCH_HAS_KCOV. Link: http://lkml.kernel.org/r/20190412102733.5154-1-mark.rutland@arm.comSigned-off-by:
Mark Rutland <mark.rutland@arm.com> Acked-by:
Dmitry Vyukov <dvyukov@google.com> Cc: Kees Cook <keescook@chromium.org> Signed-off-by:
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Johannes Weiner authored
During !CONFIG_CGROUP reclaim, we expand the inactive list size if it's thrashing on the node that is about to be reclaimed. But when cgroups are enabled, we suddenly ignore the node scope and use the cgroup scope only. The result is that pressure bleeds between NUMA nodes depending on whether cgroups are merely compiled into Linux. This behavioral difference is unexpected and undesirable. When the refault adaptivity of the inactive list was first introduced, there were no statistics at the lruvec level - the intersection of node and memcg - so it was better than nothing. But now that we have that infrastructure, use lruvec_page_state() to make the list balancing decision always NUMA aware. [hannes@cmpxchg.org: fix bisection hole] Link: http://lkml.kernel.org/r/20190417155241.GB23013@cmpxchg.org Link: http://lkml.kernel.org/r/20190412144438.2645-1-hannes@cmpxchg.org Fixes: 2a2e4885 ("mm: vmscan: fix IO/refault regression in cache workingset transition") Signed-off-by:
Johannes Weiner <hannes@cmpxchg.org> Reviewed-by:
Shakeel Butt <shakeelb@google.com> Cc: Roman Gushchin <guro@fb.com> Cc: Michal Hocko <mhocko@kernel.org> Signed-off-by:
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Qian Cai authored
has_unmovable_pages() is used by allocating CMA and gigantic pages as well as the memory hotplug. The later doesn't know how to offline CMA pool properly now, but if an unused (free) CMA page is encountered, then has_unmovable_pages() happily considers it as a free memory and propagates this up the call chain. Memory offlining code then frees the page without a proper CMA tear down which leads to an accounting issues. Moreover if the same memory range is onlined again then the memory never gets back to the CMA pool. State after memory offline: # grep cma /proc/vmstat nr_free_cma 205824 # cat /sys/kernel/debug/cma/cma-kvm_cma/count 209920 Also, kmemleak still think those memory address are reserved below but have already been used by the buddy allocator after onlining. This patch fixes the situation by treating CMA pageblocks as unmovable except when has_unmovable_pages() is called as part of CMA allocation. Offlined Pages 4096 kmemleak: Cannot insert 0xc000201f7d040008 into the object search tree (overlaps existing) Call Trace: dump_stack+0xb0/0xf4 (unreliable) create_object+0x344/0x380 __kmalloc_node+0x3ec/0x860 kvmalloc_node+0x58/0x110 seq_read+0x41c/0x620 __vfs_read+0x3c/0x70 vfs_read+0xbc/0x1a0 ksys_read+0x7c/0x140 system_call+0x5c/0x70 kmemleak: Kernel memory leak detector disabled kmemleak: Object 0xc000201cc8000000 (size 13757317120): kmemleak: comm "swapper/0", pid 0, jiffies 4294937297 kmemleak: min_count = -1 kmemleak: count = 0 kmemleak: flags = 0x5 kmemleak: checksum = 0 kmemleak: backtrace: cma_declare_contiguous+0x2a4/0x3b0 kvm_cma_reserve+0x11c/0x134 setup_arch+0x300/0x3f8 start_kernel+0x9c/0x6e8 start_here_common+0x1c/0x4b0 kmemleak: Automatic memory scanning thread ended [cai@lca.pw: use is_migrate_cma_page() and update commit log] Link: http://lkml.kernel.org/r/20190416170510.20048-1-cai@lca.pw Link: http://lkml.kernel.org/r/20190413002623.8967-1-cai@lca.pwSigned-off-by:Qian Cai <cai@lca.pw> Acked-by:
Vlastimil Babka <vbabka@suse.cz> Reviewed-by:
Oscar Salvador <osalvador@suse.de> Signed-off-by:
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Alexey Dobriyan authored
Silly sizeof(pointer) vs sizeof(uint8_t[]) bug. Link: http://lkml.kernel.org/r/20190414123009.GA12971@avx2 Fixes: e483b020 ("proc: test /proc/*/maps, smaps, smaps_rollup, statm") Signed-off-by:
Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by:
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Alexey Dobriyan authored
F29 bans mapping first 64KB even for root making test fail. Iterate from address 0 until mmap() works. Gentoo (root): openat(AT_FDCWD, "/dev/zero", O_RDONLY) = 3 mmap(NULL, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED, 3, 0) = 0 Gentoo (non-root): openat(AT_FDCWD, "/dev/zero", O_RDONLY) = 3 mmap(NULL, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED, 3, 0) = -1 EPERM (Operation not permitted) mmap(0x1000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED, 3, 0) = 0x1000 F29 (root): openat(AT_FDCWD, "/dev/zero", O_RDONLY) = 3 mmap(NULL, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED, 3, 0) = -1 EACCES (Permission denied) mmap(0x1000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED, 3, 0) = -1 EACCES (Permission denied) mmap(0x2000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED, 3, 0) = -1 EACCES (Permission denied) mmap(0x3000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED, 3, 0) = -1 EACCES (Permission denied) mmap(0x4000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED, 3, 0) = -1 EACCES (Permission denied) mmap(0x5000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED, 3, 0) = -1 EACCES (Permission denied) mmap(0x6000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED, 3, 0) = -1 EACCES (Permission denied) mmap(0x7000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED, 3, 0) = -1 EACCES (Permission denied) mmap(0x8000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED, 3, 0) = -1 EACCES (Permission denied) mmap(0x9000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED, 3, 0) = -1 EACCES (Permission denied) mmap(0xa000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED, 3, 0) = -1 EACCES (Permission denied) mmap(0xb000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED, 3, 0) = -1 EACCES (Permission denied) mmap(0xc000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED, 3, 0) = -1 EACCES (Permission denied) mmap(0xd000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED, 3, 0) = -1 EACCES (Permission denied) mmap(0xe000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED, 3, 0) = -1 EACCES (Permission denied) mmap(0xf000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED, 3, 0) = -1 EACCES (Permission denied) mmap(0x10000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED, 3, 0) = 0x10000 Now all proc tests succeed on F29 if run as root, at last! Link: http://lkml.kernel.org/r/20190414123612.GB12971@avx2Signed-off-by:
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Konstantin Khlebnikov authored
Commit 58bc4c34 ("mm/vmstat.c: skip NR_TLB_REMOTE_FLUSH* properly") depends on skipping vmstat entries with empty name introduced in 7aaf7727 ("mm: don't show nr_indirectly_reclaimable in /proc/vmstat") but reverted in b29940c1 ("mm: rename and change semantics of nr_indirectly_reclaimable_bytes"). So skipping no longer works and /proc/vmstat has misformatted lines " 0". This patch simply shows debug counters "nr_tlb_remote_*" for UP. Link: http://lkml.kernel.org/r/155481488468.467.4295519102880913454.stgit@buzz Fixes: 58bc4c34 ("mm/vmstat.c: skip NR_TLB_REMOTE_FLUSH* properly") Signed-off-by:
Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Acked-by:
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zhong jiang authored
When adding memory by probing a memory block in the sysfs interface, there is an obvious issue where we will unlock the device_hotplug_lock when we failed to takes it. That issue was introduced in 8df1d0e4 ("mm/memory_hotplug: make add_memory() take the device_hotplug_lock"). We should drop out in time when failing to take the device_hotplug_lock. Link: http://lkml.kernel.org/r/1554696437-9593-1-git-send-email-zhongjiang@huawei.com Fixes: 8df1d0e4 ("mm/memory_hotplug: make add_memory() take the device_hotplug_lock") Signed-off-by:
zhong jiang <zhongjiang@huawei.com> Reported-by:
Yang yingliang <yangyingliang@huawei.com> Acked-by:
David Hildenbrand <david@redhat.com> Reviewed-by:
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Hugh Dickins authored
The igrab() in shmem_unuse() looks good, but we forgot that it gives no protection against concurrent unmounting: a point made by Konstantin Khlebnikov eight years ago, and then fixed in 2.6.39 by 778dd893 ("tmpfs: fix race between umount and swapoff"). The current 5.1-rc swapoff is liable to hit "VFS: Busy inodes after unmount of tmpfs. Self-destruct in 5 seconds. Have a nice day..." followed by GPF. Once again, give up on using igrab(); but don't go back to making such heavy-handed use of shmem_swaplist_mutex as last time: that would spoil the new design, and I expect could deadlock inside shmem_swapin_page(). Instead, shmem_unuse() just raise a "stop_eviction" count in the shmem- specific inode, and shmem_evict_inode() wait for that to go down to 0. Call it "stop_eviction" rather than "swapoff_busy" because it can be put to use for others later (huge tmpfs patches expect to use it). That simplifies shmem_unuse(), protecting it from both unlink and unmount; and in practice lets it locate all the swap in its first try. But do not rely on that: there's still a theoretical case, when shmem_writepage() might have been preempted after its get_swap_page(), before making the swap entry visible to swapoff. [hughd@google.com: remove incorrect list_del()] Link: http://lkml.kernel.org/r/alpine.LSU.2.11.1904091133570.1898@eggly.anvils Link: http://lkml.kernel.org/r/alpine.LSU.2.11.1904081259400.1523@eggly.anvils Fixes: b56a2d8a ("mm: rid swapoff of quadratic complexity") Signed-off-by:
Hugh Dickins <hughd@google.com> Cc: "Alex Xu (Hello71)" <alex_y_xu@yahoo.ca> Cc: Huang Ying <ying.huang@intel.com> Cc: Kelley Nielsen <kelleynnn@gmail.com> Cc: Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Cc: Rik van Riel <riel@surriel.com> Cc: Vineeth Pillai <vpillai@digitalocean.com> Signed-off-by:
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Hugh Dickins authored
The old try_to_unuse() implementation was driven by find_next_to_unuse(), which terminated as soon as all the swap had been freed. Add inuse_pages checks now (alongside signal_pending()) to stop scanning mms and swap_map once finished. The same ought to be done in shmem_unuse() too, but never was before, and needs a different interface: so leave it as is for now. Link: http://lkml.kernel.org/r/alpine.LSU.2.11.1904081258200.1523@eggly.anvils Fixes: b56a2d8a ("mm: rid swapoff of quadratic complexity") Signed-off-by:
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Hugh Dickins authored
SWAP_UNUSE_MAX_TRIES 3 appeared to work well in earlier testing, but further testing has proved it to be a source of unnecessary swapoff EBUSY failures (which can then be followed by unmount EBUSY failures). When mmget_not_zero() or shmem's igrab() fails, there is an mm exiting or inode being evicted, freeing up swap independent of try_to_unuse(). Those typically completed much sooner than the old quadratic swapoff, but now it's more common that swapoff may need to wait for them. It's possible to move those cases from init_mm.mmlist and shmem_swaplist to separate "exiting" swaplists, and try_to_unuse() then wait for those lists to be emptied; but we've not bothered with that in the past, and don't want to risk missing some other forgotten case. So just revert to cycling around until the swap is gone, without any retries limit. Link: http://lkml.kernel.org/r/alpine.LSU.2.11.1904081256170.1523@eggly.anvils Fixes: b56a2d8a ("mm: rid swapoff of quadratic complexity") Signed-off-by:
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Hugh Dickins authored
Swapfile "type" was passed all the way down to shmem_unuse_inode(), but then forgotten from shmem_find_swap_entries(): with the result that removing one swapfile would try to free up all the swap from shmem - no problem when only one swapfile anyway, but counter-productive when more, causing swapoff to be unnecessarily OOM-killed when it should succeed. Link: http://lkml.kernel.org/r/alpine.LSU.2.11.1904081254470.1523@eggly.anvils Fixes: b56a2d8a ("mm: rid swapoff of quadratic complexity") Signed-off-by:
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Qian Cai authored
Commit 51dedad0 ("kasan, slab: make freelist stored without tags") calls kasan_reset_tag() for off-slab slab management object leading to freelist being stored non-tagged. However, cache_grow_begin() calls alloc_slabmgmt() which calls kmem_cache_alloc_node() assigns a tag for the address and stores it in the shadow address. As the result, it causes endless errors below during boot due to drain_freelist() -> slab_destroy() -> kasan_slab_free() which compares already untagged freelist against the stored tag in the shadow address. Since off-slab slab management object freelist is such a special case, just store it tagged. Non-off-slab management object freelist is still stored untagged which has not been assigned a tag and should not cause any other troubles with this inconsistency. BUG: KASAN: double-free or invalid-free in slab_destroy+0x84/0x88 Pointer tag: [ff], memory tag: [99] CPU: 0 PID: 1376 Comm: kworker/0:4 Tainted: G W 5.1.0-rc3+ #8 Hardware name: HPE Apollo 70 /C01_APACHE_MB , BIOS L50_5.13_1.0.6 07/10/2018 Workqueue: cgroup_destroy css_killed_work_fn Call trace: print_address_description+0x74/0x2a4 kasan_report_invalid_free+0x80/0xc0 __kasan_slab_free+0x204/0x208 kasan_slab_free+0xc/0x18 kmem_cache_free+0xe4/0x254 slab_destroy+0x84/0x88 drain_freelist+0xd0/0x104 __kmem_cache_shrink+0x1ac/0x224 __kmemcg_cache_deactivate+0x1c/0x28 memcg_deactivate_kmem_caches+0xa0/0xe8 memcg_offline_kmem+0x8c/0x3d4 mem_cgroup_css_offline+0x24c/0x290 css_killed_work_fn+0x154/0x618 process_one_work+0x9cc/0x183c worker_thread+0x9b0/0xe38 kthread+0x374/0x390 ret_from_fork+0x10/0x18 Allocated by task 1625: __kasan_kmalloc+0x168/0x240 kasan_slab_alloc+0x18/0x20 kmem_cache_alloc_node+0x1f8/0x3a0 cache_grow_begin+0x4fc/0xa24 cache_alloc_refill+0x2f8/0x3e8 kmem_cache_alloc+0x1bc/0x3bc sock_alloc_inode+0x58/0x334 alloc_inode+0xb8/0x164 new_inode_pseudo+0x20/0xec sock_alloc+0x74/0x284 __sock_create+0xb0/0x58c sock_create+0x98/0xb8 __sys_socket+0x60/0x138 __arm64_sys_socket+0xa4/0x110 el0_svc_handler+0x2c0/0x47c el0_svc+0x8/0xc Freed by task 1625: __kasan_slab_free+0x114/0x208 kasan_slab_free+0xc/0x18 kfree+0x1a8/0x1e0 single_release+0x7c/0x9c close_pdeo+0x13c/0x43c proc_reg_release+0xec/0x108 __fput+0x2f8/0x784 ____fput+0x1c/0x28 task_work_run+0xc0/0x1b0 do_notify_resume+0xb44/0x1278 work_pending+0x8/0x10 The buggy address belongs to the object at ffff809681b89e00 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 0 bytes inside of 128-byte region [ffff809681b89e00, ffff809681b89e80) The buggy address belongs to the page: page:ffff7fe025a06e00 count:1 mapcount:0 mapping:01ff80082000fb00 index:0xffff809681b8fe04 flags: 0x17ffffffc000200(slab) raw: 017ffffffc000200 ffff7fe025a06d08 ffff7fe022ef7b88 01ff80082000fb00 raw: ffff809681b8fe04 ffff809681b80000 00000001000000e0 0000000000000000 page dumped because: kasan: bad access detected page allocated via order 0, migratetype Unmovable, gfp_mask 0x2420c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_COMP|__GFP_THISNODE) prep_new_page+0x4e0/0x5e0 get_page_from_freelist+0x4ce8/0x50d4 __alloc_pages_nodemask+0x738/0x38b8 cache_grow_begin+0xd8/0xa24 ____cache_alloc_node+0x14c/0x268 __kmalloc+0x1c8/0x3fc ftrace_free_mem+0x408/0x1284 ftrace_free_init_mem+0x20/0x28 kernel_init+0x24/0x548 ret_from_fork+0x10/0x18 Memory state around the buggy address: ffff809681b89c00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe ffff809681b89d00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe >ffff809681b89e00: 99 99 99 99 99 99 99 99 fe fe fe fe fe fe fe fe ^ ffff809681b89f00: 43 43 43 43 43 fe fe fe fe fe fe fe fe fe fe fe ffff809681b8a000: 6d fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe Link: http://lkml.kernel.org/r/20190403022858.97584-1-cai@lca.pw Fixes: 51dedad0 ("kasan, slab: make freelist stored without tags") Signed-off-by:
Andrey Konovalov <andreyknvl@google.com> Cc: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: David Rientjes <rientjes@google.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Alexander Potapenko <glider@google.com> Cc: Dmitry Vyukov <dvyukov@google.com> Signed-off-by:
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- 18 Apr, 2019 7 commits
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git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linuxLinus Torvalds authored
Pull arm64 fix from Catalin Marinas: "Avoid compiler uninitialised warning introduced by recent arm64 futex fix" * tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: arm64: futex: Restore oldval initialization to work around buggy compilers
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Nathan Chancellor authored
Commit 045afc24 ("arm64: futex: Fix FUTEX_WAKE_OP atomic ops with non-zero result value") removed oldval's zero initialization in arch_futex_atomic_op_inuser because it is not necessary. Unfortunately, Android's arm64 GCC 4.9.4 [1] does not agree: ../kernel/futex.c: In function 'do_futex': ../kernel/futex.c:1658:17: warning: 'oldval' may be used uninitialized in this function [-Wmaybe-uninitialized] return oldval == cmparg; ^ In file included from ../kernel/futex.c:73:0: ../arch/arm64/include/asm/futex.h:53:6: note: 'oldval' was declared here int oldval, ret, tmp; ^ GCC fails to follow that when ret is non-zero, futex_atomic_op_inuser returns right away, avoiding the uninitialized use that it claims. Restoring the zero initialization works around this issue. [1]: https://android.googlesource.com/platform/prebuilts/gcc/linux-x86/aarch64/aarch64-linux-android-4.9/ Cc: stable@vger.kernel.org Fixes: 045afc24 ("arm64: futex: Fix FUTEX_WAKE_OP atomic ops with non-zero result value") Reviewed-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by:
Nathan Chancellor <natechancellor@gmail.com> Signed-off-by:
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Christian Brauner authored
As stated in the original commit for pidfd_send_signal() we don't allow to signal processes through O_PATH file descriptors since it is semantically equivalent to a write on the pidfd. We already correctly error out right now and return EBADF if an O_PATH fd is passed. This is because we use file->f_op to detect whether a pidfd is passed and O_PATH fds have their file->f_op set to empty_fops in do_dentry_open() and thus fail the test. Thus, there is no regression. It's just semantically correct to use fdget() and return an error right from there instead of taking a reference and returning an error later. Signed-off-by:
Christian Brauner <christian@brauner.io> Acked-by:
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git://git.kernel.org/pub/scm/linux/kernel/git/s390/linuxLinus Torvalds authored
Pull s390 bug fixes from Martin Schwidefsky: - Fix overwrite of the initial ramdisk due to misuse of IS_ENABLED - Fix integer overflow in the dasd driver resulting in incorrect number of blocks for large devices - Fix a lockdep false positive in the 3270 driver - Fix a deadlock in the zcrypt driver - Fix incorrect debug feature entries in the pkey api - Fix inline assembly constraints fallout with CONFIG_KASAN=y * tag 's390-5.1-3' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: s390: correct some inline assembly constraints s390/pkey: add one more argument space for debug feature entry s390/zcrypt: fix possible deadlock situation on ap queue remove s390/3270: fix lockdep false positive on view->lock s390/dasd: Fix capacity calculation for large volumes s390/mem_detect: Use IS_ENABLED(CONFIG_BLK_DEV_INITRD)
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git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fsLinus Torvalds authored
Pull AFS fixes from David Howells: - Stop using the deprecated get_seconds(). - Don't make tracepoint strings const as the section they go in isn't read-only. - Differentiate failure due to unmarshalling from other failure cases. We shouldn't abort with RXGEN_CC/SS_UNMARSHAL if it's not due to unmarshalling. - Add a missing unlock_page(). - Fix the interaction between receiving a notification from a server that it has invalidated all outstanding callback promises and a client call that we're in the middle of making that will get a new promise. * tag 'afs-fixes-20190413' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs: afs: Fix in-progess ops to ignore server-level callback invalidation afs: Unlock pages for __pagevec_release() afs: Differentiate abort due to unmarshalling from other errors afs: Avoid section confusion in CM_NAME afs: avoid deprecated get_seconds()
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git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6Linus Torvalds authored
Pull crypto fix from Herbert Xu: "Fix a bug in the implementation of the x86 accelerated version of poly1305" * 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: crypto: x86/poly1305 - fix overflow during partial reduction
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git://anongit.freedesktop.org/drm/drmLinus Torvalds authored
Pull drm fixes from Dave Airlie: "Since Easter is looming for me, I'm just pushing whatever is in my tree, I'll see what else turns up and maybe I'll send another pull early next week if there is anything. tegra: - stream id programming fix - avoid divide by 0 for bad hdmi audio setup code ttm: - Hugepages fix - refcount imbalance in error path fix amdgpu: - GPU VM fixes for Vega/RV - DC AUX fix for active DP-DVI dongles - DC fix for multihead regression" * tag 'drm-fixes-2019-04-18' of git://anongit.freedesktop.org/drm/drm: drm/tegra: hdmi: Setup audio only if configured drm/amd/display: If one stream full updates, full update all planes drm/amdgpu/gmc9: fix VM_L2_CNTL3 programming drm/amdgpu: shadow in shadow_list without tbo.mem.start cause page fault in sriov TDR gpu: host1x: Program stream ID to bypass without SMMU drm/amd/display: extending AUX SW Timeout drm/ttm: fix dma_fence refcount imbalance on error path drm/ttm: fix incrementing the page pointer for huge pages drm/ttm: fix start page for huge page check in ttm_put_pages() drm/ttm: fix out-of-bounds read in ttm_put_pages() v2
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- 17 Apr, 2019 17 commits
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git://people.freedesktop.org/~agd5f/linuxDave Airlie authored
- GPUVM fixes for vega/RV and shadow buffers - TTM fixes for hugepages - TTM fix for refcount imbalance in error path - DC AUX fix for some active DP-DVI dongles - DC fix for multihead VT switch regression Signed-off-by:
Dave Airlie <airlied@redhat.com> From: Alex Deucher <alexdeucher@gmail.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190415051703.3377-1-alexander.deucher@amd.com
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git://anongit.freedesktop.org/tegra/linuxDave Airlie authored
drm/tegra: Fixes for v5.1-rc6 This contains a follow-up fix for the stream ID programming and a fix for a regression on older Tegra devices (Tegra20 and Tegra30) that are running into a division by zero trying to enable audio over HDMI. Signed-off-by:
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git://git.samba.org/sfrench/cifs-2.6Linus Torvalds authored
Pull smb3 fixes from Steve French: "Five small SMB3 fixes, all also for stable - an important fix for an oplock (lease) bug, a handle leak, and three bugs spotted by KASAN" * tag '5.1-rc5-smb3-fixes' of git://git.samba.org/sfrench/cifs-2.6: CIFS: keep FileInfo handle live during oplock break cifs: fix handle leak in smb2_query_symlink() cifs: Fix lease buffer length error cifs: Fix use-after-free in SMB2_read cifs: Fix use-after-free in SMB2_write
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git://github.com/cminyard/linux-ipmiLinus Torvalds authored
Pull IPMI fixes from Corey Minyard: "Fixes for some bugs cause by recent changes. One crash if you feed bad data to the module parameters, one BUG that sometimes occurs when a user closes the connection, and one bug that cause the driver to not work if the configuration information only comes in from SMBIOS" * tag 'for-linus-5.1-2' of git://github.com/cminyard/linux-ipmi: ipmi: fix sleep-in-atomic in free_user at cleanup SRCU user->release_barrier ipmi: ipmi_si_hardcode.c: init si_type array to fix a crash ipmi: Fix failure on SMBIOS specified devices
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git://git.kernel.org/pub/scm/linux/kernel/git/davem/netLinus Torvalds authored
Pull networking fixes from David Miller: 1) Handle init flow failures properly in iwlwifi driver, from Shahar S Matityahu. 2) mac80211 TXQs need to be unscheduled on powersave start, from Felix Fietkau. 3) SKB memory accounting fix in A-MDSU aggregation, from Felix Fietkau. 4) Increase RCU lock hold time in mlx5 FPGA code, from Saeed Mahameed. 5) Avoid checksum complete with XDP in mlx5, also from Saeed. 6) Fix netdev feature clobbering in ibmvnic driver, from Thomas Falcon. 7) Partial sent TLS record leak fix from Jakub Kicinski. 8) Reject zero size iova range in vhost, from Jason Wang. 9) Allow pending work to complete before clcsock release from Karsten Graul. 10) Fix XDP handling max MTU in thunderx, from Matteo Croce. 11) A lot of protocols look at the sa_family field of a sockaddr before validating it's length is large enough, from Tetsuo Handa. 12) Don't write to free'd pointer in qede ptp error path, from Colin Ian King. 13) Have to recompile IP options in ipv4_link_failure because it can be invoked from ARP, from Stephen Suryaputra. 14) Doorbell handling fixes in qed from Denis Bolotin. 15) Revert net-sysfs kobject register leak fix, it causes new problems. From Wang Hai. 16) Spectre v1 fix in ATM code, from Gustavo A. R. Silva. 17) Fix put of BROPT_VLAN_STATS_PER_PORT in bridging code, from Nikolay Aleksandrov. * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (111 commits) socket: fix compat SO_RCVTIMEO_NEW/SO_SNDTIMEO_NEW tcp: tcp_grow_window() needs to respect tcp_space() ocelot: Clean up stats update deferred work ocelot: Don't sleep in atomic context (irqs_disabled()) net: bridge: fix netlink export of vlan_stats_per_port option qed: fix spelling mistake "faspath" -> "fastpath" tipc: set sysctl_tipc_rmem and named_timeout right range tipc: fix link established but not in session net: Fix missing meta data in skb with vlan packet net: atm: Fix potential Spectre v1 vulnerabilities net/core: work around section mismatch warning for ptp_classifier net: bridge: fix per-port af_packet sockets bnx2x: fix spelling mistake "dicline" -> "decline" route: Avoid crash from dereferencing NULL rt->from MAINTAINERS: normalize Woojung Huh's email address bonding: fix event handling for stacked bonds Revert "net-sysfs: Fix memory leak in netdev_register_kobject" rtnetlink: fix rtnl_valid_stats_req() nlmsg_len check qed: Fix the DORQ's attentions handling qed: Fix missing DORQ attentions ... -
Corey Minyard authored
free_user() could be called in atomic context. This patch pushed the free operation off into a workqueue. Example: BUG: sleeping function called from invalid context at kernel/workqueue.c:2856 in_atomic(): 1, irqs_disabled(): 0, pid: 177, name: ksoftirqd/27 CPU: 27 PID: 177 Comm: ksoftirqd/27 Not tainted 4.19.25-3 #1 Hardware name: AIC 1S-HV26-08/MB-DPSB04-06, BIOS IVYBV060 10/21/2015 Call Trace: dump_stack+0x5c/0x7b ___might_sleep+0xec/0x110 __flush_work+0x48/0x1f0 ? try_to_del_timer_sync+0x4d/0x80 _cleanup_srcu_struct+0x104/0x140 free_user+0x18/0x30 [ipmi_msghandler] ipmi_free_recv_msg+0x3a/0x50 [ipmi_msghandler] deliver_response+0xbd/0xd0 [ipmi_msghandler] deliver_local_response+0xe/0x30 [ipmi_msghandler] handle_one_recv_msg+0x163/0xc80 [ipmi_msghandler] ? dequeue_entity+0xa0/0x960 handle_new_recv_msgs+0x15c/0x1f0 [ipmi_msghandler] tasklet_action_common.isra.22+0x103/0x120 __do_softirq+0xf8/0x2d7 run_ksoftirqd+0x26/0x50 smpboot_thread_fn+0x11d/0x1e0 kthread+0x103/0x140 ? sort_range+0x20/0x20 ? kthread_destroy_worker+0x40/0x40 ret_from_fork+0x1f/0x40 Fixes: 77f82696 ("ipmi: fix use-after-free of user->release_barrier.rda") Reported-by:
Corey Minyard <cminyard@mvista.com> Cc: stable@vger.kernel.org # 5.0 Cc: Yang Yingliang <yangyingliang@huawei.com>
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Vasily Gorbik authored
Inline assembly code changed in this patch should really use "Q" constraint "Memory reference without index register and with short displacement". The kernel build with kasan instrumentation enabled might occasionally break otherwise (due to stack instrumentation). Signed-off-by:
Vasily Gorbik <gor@linux.ibm.com> Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com>
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Thierry Reding authored
The audio configuration is only valid if the HDMI codec has been properly set up. Do not attempt to set up audio before that happens because it causes a division by zero. Note that this is only problematic on Tegra20 and Tegra30. Later chips implement the division instructions which return zero when dividing by zero and don't throw an exception. Fixes: db5adf4d ("drm/tegra: hdmi: Fix audio to work with any pixel clock rate") Reported-by:
Marcel Ziswiler <marcel.ziswiler@toradex.com> Tested-by:
Dmitry Osipenko <digetx@gmail.com> Signed-off-by:
Thierry Reding <treding@nvidia.com>
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Arnd Bergmann authored
It looks like the new socket options only work correctly for native execution, but in case of compat mode fall back to the old behavior as we ignore the 'old_timeval' flag. Rework so we treat SO_RCVTIMEO_NEW/SO_SNDTIMEO_NEW the same way in compat and native 32-bit mode. Cc: Deepa Dinamani <deepa.kernel@gmail.com> Fixes: a9beb86a ("sock: Add SO_RCVTIMEO_NEW and SO_SNDTIMEO_NEW") Signed-off-by:
Deepa Dinamani <deepa.kernel@gmail.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
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Eric Dumazet authored
For some reason, tcp_grow_window() correctly tests if enough room is present before attempting to increase tp->rcv_ssthresh, but does not prevent it to grow past tcp_space() This is causing hard to debug issues, like failing the (__tcp_select_window(sk) >= tp->rcv_wnd) test in __tcp_ack_snd_check(), causing ACK delays and possibly slow flows. Depending on tcp_rmem[2], MTU, skb->len/skb->truesize ratio, we can see the problem happening on "netperf -t TCP_RR -- -r 2000,2000" after about 60 round trips, when the active side no longer sends immediate acks. This bug predates git history. Signed-off-by:
Eric Dumazet <edumazet@google.com> Acked-by:
Soheil Hassas Yeganeh <soheil@google.com> Acked-by:
Neal Cardwell <ncardwell@google.com> Acked-by:
Wei Wang <weiwan@google.com> Signed-off-by:
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Claudiu Manoil authored
This is preventive cleanup that may save troubles later. No need to cancel repeateadly queued work if code is properly refactored. Don't let the ethtool -s process interfere with the stat workqueue scheduling. Signed-off-by:
Claudiu Manoil <claudiu.manoil@nxp.com> Signed-off-by:
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Claudiu Manoil authored
Preemption disabled at: [<ffff000008cabd54>] dev_set_rx_mode+0x1c/0x38 Call trace: [<ffff00000808a5c0>] dump_backtrace+0x0/0x3d0 [<ffff00000808a9a4>] show_stack+0x14/0x20 [<ffff000008e6c0c0>] dump_stack+0xac/0xe4 [<ffff0000080fe76c>] ___might_sleep+0x164/0x238 [<ffff0000080fe890>] __might_sleep+0x50/0x88 [<ffff0000082261e4>] kmem_cache_alloc+0x17c/0x1d0 [<ffff000000ea0ae8>] ocelot_set_rx_mode+0x108/0x188 [mscc_ocelot_common] [<ffff000008cabcf0>] __dev_set_rx_mode+0x58/0xa0 [<ffff000008cabd5c>] dev_set_rx_mode+0x24/0x38 Fixes: a556c76a ("net: mscc: Add initial Ocelot switch support") Signed-off-by:
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Nikolay Aleksandrov authored
Since the introduction of the vlan_stats_per_port option the netlink export of it has been broken since I made a typo and used the ifla attribute instead of the bridge option to retrieve its state. Sysfs export is fine, only netlink export has been affected. Fixes: 9163a0fc ("net: bridge: add support for per-port vlan stats") Signed-off-by:
Nikolay Aleksandrov <nikolay@cumulusnetworks.com> Signed-off-by:
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Colin Ian King authored
There is a spelling mistake in a DP_INFO message, fix it. Signed-off-by:
Colin Ian King <colin.king@canonical.com> Reviewed-by:
Mukesh Ojha <mojha@codeaurora.org> Signed-off-by:
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Jie Liu authored
We find that sysctl_tipc_rmem and named_timeout do not have the right minimum setting. sysctl_tipc_rmem should be larger than zero, like sysctl_tcp_rmem. And named_timeout as a timeout setting should be not less than zero. Fixes: cc79dd1b ("tipc: change socket buffer overflow control to respect sk_rcvbuf") Fixes: a5325ae5 ("tipc: add name distributor resiliency queue") Signed-off-by:
Jie Liu <liujie165@huawei.com> Reported-by:
Qiang Ning <ningqiang1@huawei.com> Reviewed-by:
Zhiqiang Liu <liuzhiqiang26@huawei.com> Reviewed-by:
Miaohe Lin <linmiaohe@huawei.com> Signed-off-by:
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Tuong Lien authored
According to the link FSM, when a link endpoint got RESET_MSG (- a traditional one without the stopping bit) from its peer, it moves to PEER_RESET state and raises a LINK_DOWN event which then resets the link itself. Its state will become ESTABLISHING after the reset event and the link will be re-established soon after this endpoint starts to send ACTIVATE_MSG to the peer. There is no problem with this mechanism, however the link resetting has cleared the link 'in_session' flag (along with the other important link data such as: the link 'mtu') that was correctly set up at the 1st step (i.e. when this endpoint received the peer RESET_MSG). As a result, the link will become ESTABLISHED, but the 'in_session' flag is not set, and all STATE_MSG from its peer will be dropped at the link_validate_msg(). It means the link not synced and will sooner or later face a failure. Since the link reset action is obviously needed for a new link session (this is also true in the other situations), the problem here is that the link is re-established a bit too early when the link endpoints are not really in-sync yet. The commit forces a resync as already done in the previous commit 91986ee1 ("tipc: fix link session and re-establish issues") by simply varying the link 'peer_session' value at the link_reset(). Acked-by:
Jon Maloy <jon.maloy@ericsson.com> Signed-off-by:
Tuong Lien <tuong.t.lien@dektech.com.au> Signed-off-by:
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Yuya Kusakabe authored
skb_reorder_vlan_header() should move XDP meta data with ethernet header if XDP meta data exists. Fixes: de8f3a83 ("bpf: add meta pointer for direct access") Signed-off-by:
Yuya Kusakabe <yuya.kusakabe@gmail.com> Signed-off-by:
Takeru Hayasaka <taketarou2@gmail.com> Co-developed-by:
Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp> Signed-off-by:
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