1. 07 Mar, 2018 14 commits
  2. 28 Feb, 2018 9 commits
  3. 21 Feb, 2018 1 commit
    • Leon Romanovsky's avatar
      RDMA/uverbs: Fix kernel panic while using XRC_TGT QP type · f4576587
      Leon Romanovsky authored
      Attempt to modify XRC_TGT QP type from the user space (ibv_xsrq_pingpong
      invocation) will trigger the following kernel panic. It is caused by the
      fact that such QPs missed uobject initialization.
      
      [   17.408845] BUG: unable to handle kernel NULL pointer dereference at 0000000000000048
      [   17.412645] IP: rdma_lookup_put_uobject+0x9/0x50
      [   17.416567] PGD 0 P4D 0
      [   17.419262] Oops: 0000 [#1] SMP PTI
      [   17.422915] CPU: 0 PID: 455 Comm: ibv_xsrq_pingpo Not tainted 4.16.0-rc1+ #86
      [   17.424765] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.7.5-0-ge51488c-20140602_164612-nilsson.home.kraxel.org 04/01/2014
      [   17.427399] RIP: 0010:rdma_lookup_put_uobject+0x9/0x50
      [   17.428445] RSP: 0018:ffffb8c7401e7c90 EFLAGS: 00010246
      [   17.429543] RAX: 0000000000000000 RBX: ffffb8c7401e7cf8 RCX: 0000000000000000
      [   17.432426] RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000000
      [   17.437448] RBP: 0000000000000000 R08: 00000000000218f0 R09: ffffffff8ebc4cac
      [   17.440223] R10: fffff6038052cd80 R11: ffff967694b36400 R12: ffff96769391f800
      [   17.442184] R13: ffffb8c7401e7cd8 R14: 0000000000000000 R15: ffff967699f60000
      [   17.443971] FS:  00007fc29207d700(0000) GS:ffff96769fc00000(0000) knlGS:0000000000000000
      [   17.446623] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [   17.448059] CR2: 0000000000000048 CR3: 000000001397a000 CR4: 00000000000006b0
      [   17.449677] Call Trace:
      [   17.450247]  modify_qp.isra.20+0x219/0x2f0
      [   17.451151]  ib_uverbs_modify_qp+0x90/0xe0
      [   17.452126]  ib_uverbs_write+0x1d2/0x3c0
      [   17.453897]  ? __handle_mm_fault+0x93c/0xe40
      [   17.454938]  __vfs_write+0x36/0x180
      [   17.455875]  vfs_write+0xad/0x1e0
      [   17.456766]  SyS_write+0x52/0xc0
      [   17.457632]  do_syscall_64+0x75/0x180
      [   17.458631]  entry_SYSCALL_64_after_hwframe+0x21/0x86
      [   17.460004] RIP: 0033:0x7fc29198f5a0
      [   17.460982] RSP: 002b:00007ffccc71f018 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
      [   17.463043] RAX: ffffffffffffffda RBX: 0000000000000078 RCX: 00007fc29198f5a0
      [   17.464581] RDX: 0000000000000078 RSI: 00007ffccc71f050 RDI: 0000000000000003
      [   17.466148] RBP: 0000000000000000 R08: 0000000000000078 R09: 00007ffccc71f050
      [   17.467750] R10: 000055b6cf87c248 R11: 0000000000000246 R12: 00007ffccc71f300
      [   17.469541] R13: 000055b6cf8733a0 R14: 0000000000000000 R15: 0000000000000000
      [   17.471151] Code: 00 00 0f 1f 44 00 00 48 8b 47 48 48 8b 00 48 8b 40 10 e9 0b 8b 68 00 90 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 53 89 f5 <48> 8b 47 48 48 89 fb 40 0f b6 f6 48 8b 00 48 8b 40 20 e8 e0 8a
      [   17.475185] RIP: rdma_lookup_put_uobject+0x9/0x50 RSP: ffffb8c7401e7c90
      [   17.476841] CR2: 0000000000000048
      [   17.477764] ---[ end trace 1dbcc5354071a712 ]---
      [   17.478880] Kernel panic - not syncing: Fatal exception
      [   17.480277] Kernel Offset: 0xd000000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
      
      Fixes: 2f08ee36
      
       ("RDMA/restrack: don't use uaccess_kernel()")
      Signed-off-by: default avatarLeon Romanovsky <leonro@mellanox.com>
      Signed-off-by: default avatarDoug Ledford <dledford@redhat.com>
      f4576587
  4. 20 Feb, 2018 5 commits
  5. 16 Feb, 2018 2 commits
  6. 15 Feb, 2018 9 commits
    • Adit Ranadive's avatar
      RDMA/vmw_pvrdma: Fix usage of user response structures in ABI file · 1f5a6c47
      Adit Ranadive authored
      This ensures that we return the right structures back to userspace.
      Otherwise, it looks like the reserved fields in the response structures
      in userspace might have uninitialized data in them.
      
      Fixes: 8b10ba78 ("RDMA/vmw_pvrdma: Add shared receive queue support")
      Fixes: 29c8d9eb
      
       ("IB: Add vmw_pvrdma driver")
      Suggested-by: default avatarJason Gunthorpe <jgg@mellanox.com>
      Reviewed-by: default avatarBryan Tan <bryantan@vmware.com>
      Reviewed-by: default avatarAditya Sarwade <asarwade@vmware.com>
      Reviewed-by: default avatarJorgen Hansen <jhansen@vmware.com>
      Signed-off-by: default avatarAdit Ranadive <aditr@vmware.com>
      Signed-off-by: default avatarJason Gunthorpe <jgg@mellanox.com>
      1f5a6c47
    • Leon Romanovsky's avatar
      RDMA/uverbs: Sanitize user entered port numbers prior to access it · 5d4c05c3
      Leon Romanovsky authored
      ==================================================================
      BUG: KASAN: use-after-free in copy_ah_attr_from_uverbs+0x6f2/0x8c0
      Read of size 4 at addr ffff88006476a198 by task syzkaller697701/265
      
      CPU: 0 PID: 265 Comm: syzkaller697701 Not tainted 4.15.0+ #90
      Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.7.5-0-ge51488c-20140602_164612-nilsson.home.kraxel.org 04/01/2014
      Call Trace:
       dump_stack+0xde/0x164
       ? dma_virt_map_sg+0x22c/0x22c
       ? show_regs_print_info+0x17/0x17
       ? lock_contended+0x11a0/0x11a0
       print_address_description+0x83/0x3e0
       kasan_report+0x18c/0x4b0
       ? copy_ah_attr_from_uverbs+0x6f2/0x8c0
       ? copy_ah_attr_from_uverbs+0x6f2/0x8c0
       ? lookup_get_idr_uobject+0x120/0x200
       ? copy_ah_attr_from_uverbs+0x6f2/0x8c0
       copy_ah_attr_from_uverbs+0x6f2/0x8c0
       ? modify_qp+0xd0e/0x1350
       modify_qp+0xd0e/0x1350
       ib_uverbs_modify_qp+0xf9/0x170
       ? ib_uverbs_query_qp+0xa70/0xa70
       ib_uverbs_write+0x7f9/0xef0
       ? attach_entity_load_avg+0x8b0/0x8b0
       ? ib_uverbs_query_qp+0xa70/0xa70
       ? uverbs_devnode+0x110/0x110
       ? cyc2ns_read_end+0x10/0x10
       ? print_irqtrace_events+0x280/0x280
       ? sched_clock_cpu+0x18/0x200
       ? _raw_spin_unlock_irq+0x29/0x40
       ? _raw_spin_unlock_irq+0x29/0x40
       ? _raw_spin_unlock_irq+0x29/0x40
       ? time_hardirqs_on+0x27/0x670
       __vfs_write+0x10d/0x700
       ? uverbs_devnode+0x110/0x110
       ? kernel_read+0x170/0x170
       ? _raw_spin_unlock_irq+0x29/0x40
       ? finish_task_switch+0x1bd/0x7a0
       ? finish_task_switch+0x194/0x7a0
       ? prandom_u32_state+0xe/0x180
       ? rcu_read_unlock+0x80/0x80
       ? security_file_permission+0x93/0x260
       vfs_write+0x1b0/0x550
       SyS_write+0xc7/0x1a0
       ? SyS_read+0x1a0/0x1a0
       ? trace_hardirqs_on_thunk+0x1a/0x1c
       entry_SYSCALL_64_fastpath+0x1e/0x8b
      RIP: 0033:0x433c29
      RSP: 002b:00007ffcf2be82a8 EFLAGS: 00000217
      
      Allocated by task 62:
       kasan_kmalloc+0xa0/0xd0
       kmem_cache_alloc+0x141/0x480
       dup_fd+0x101/0xcc0
       copy_process.part.62+0x166f/0x4390
       _do_fork+0x1cb/0xe90
       kernel_thread+0x34/0x40
       call_usermodehelper_exec_work+0x112/0x260
       process_one_work+0x929/0x1aa0
       worker_thread+0x5c6/0x12a0
       kthread+0x346/0x510
       ret_from_fork+0x3a/0x50
      
      Freed by task 259:
       kasan_slab_free+0x71/0xc0
       kmem_cache_free+0xf3/0x4c0
       put_files_struct+0x225/0x2c0
       exit_files+0x88/0xc0
       do_exit+0x67c/0x1520
       do_group_exit+0xe8/0x380
       SyS_exit_group+0x1e/0x20
       entry_SYSCALL_64_fastpath+0x1e/0x8b
      
      The buggy address belongs to the object at ffff88006476a000
       which belongs to the cache files_cache of size 832
      The buggy address is located 408 bytes inside of
       832-byte region [ffff88006476a000, ffff88006476a340)
      The buggy address belongs to the page:
      page:ffffea000191da80 count:1 mapcount:0 mapping:          (null) index:0x0 compound_mapcount: 0
      flags: 0x4000000000008100(slab|head)
      raw: 4000000000008100 0000000000000000 0000000000000000 0000000100080008
      raw: 0000000000000000 0000000100000001 ffff88006bcf7a80 0000000000000000
      page dumped because: kasan: bad access detected
      
      Memory state around the buggy address:
       ffff88006476a080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
       ffff88006476a100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
      >ffff88006476a180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                  ^
       ffff88006476a200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
       ffff88006476a280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
      ==================================================================
      
      Cc: syzkaller <syzkaller@googlegroups.com>
      Cc: <stable@vger.kernel.org> # 4.11
      Fixes: 44c58487
      
       ("IB/core: Define 'ib' and 'roce' rdma_ah_attr types")
      Reported-by: default avatarNoa Osherovich <noaos@mellanox.com>
      Signed-off-by: default avatarLeon Romanovsky <leonro@mellanox.com>
      Signed-off-by: default avatarJason Gunthorpe <jgg@mellanox.com>
      5d4c05c3
    • Leon Romanovsky's avatar
      RDMA/uverbs: Fix circular locking dependency · 1ff5325c
      Leon Romanovsky authored
      Avoid circular locking dependency by calling
      to uobj_alloc_commit() outside of xrcd_tree_mutex lock.
      
      ======================================================
      WARNING: possible circular locking dependency detected
      4.15.0+ #87 Not tainted
      ------------------------------------------------------
      syzkaller401056/269 is trying to acquire lock:
       (&uverbs_dev->xrcd_tree_mutex){+.+.}, at: [<000000006c12d2cd>] uverbs_free_xrcd+0xd2/0x360
      
      but task is already holding lock:
       (&ucontext->uobjects_lock){+.+.}, at: [<00000000da010f09>] uverbs_cleanup_ucontext+0x168/0x730
      
      which lock already depends on the new lock.
      
      the existing dependency chain (in reverse order) is:
      
      -> #1 (&ucontext->uobjects_lock){+.+.}:
             __mutex_lock+0x111/0x1720
             rdma_alloc_commit_uobject+0x22c/0x600
             ib_uverbs_open_xrcd+0x61a/0xdd0
             ib_uverbs_write+0x7f9/0xef0
             __vfs_write+0x10d/0x700
             vfs_write+0x1b0/0x550
             SyS_write+0xc7/0x1a0
             entry_SYSCALL_64_fastpath+0x1e/0x8b
      
      -> #0 (&uverbs_dev->xrcd_tree_mutex){+.+.}:
             lock_acquire+0x19d/0x440
             __mutex_lock+0x111/0x1720
             uverbs_free_xrcd+0xd2/0x360
             remove_commit_idr_uobject+0x6d/0x110
             uverbs_cleanup_ucontext+0x2f0/0x730
             ib_uverbs_cleanup_ucontext.constprop.3+0x52/0x120
             ib_uverbs_close+0xf2/0x570
             __fput+0x2cd/0x8d0
             task_work_run+0xec/0x1d0
             do_exit+0x6a1/0x1520
             do_group_exit+0xe8/0x380
             SyS_exit_group+0x1e/0x20
             entry_SYSCALL_64_fastpath+0x1e/0x8b
      
      other info that might help us debug this:
      
       Possible unsafe locking scenario:
      
             CPU0                    CPU1
             ----                    ----
        lock(&ucontext->uobjects_lock);
                                     lock(&uverbs_dev->xrcd_tree_mutex);
                                     lock(&ucontext->uobjects_lock);
        lock(&uverbs_dev->xrcd_tree_mutex);
      
       *** DEADLOCK ***
      
      3 locks held by syzkaller401056/269:
       #0:  (&file->cleanup_mutex){+.+.}, at: [<00000000c9f0c252>] ib_uverbs_close+0xac/0x570
       #1:  (&ucontext->cleanup_rwsem){++++}, at: [<00000000b6994d49>] uverbs_cleanup_ucontext+0xf6/0x730
       #2:  (&ucontext->uobjects_lock){+.+.}, at: [<00000000da010f09>] uverbs_cleanup_ucontext+0x168/0x730
      
      stack backtrace:
      CPU: 0 PID: 269 Comm: syzkaller401056 Not tainted 4.15.0+ #87
      Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.7.5-0-ge51488c-20140602_164612-nilsson.home.kraxel.org 04/01/2014
      Call Trace:
       dump_stack+0xde/0x164
       ? dma_virt_map_sg+0x22c/0x22c
       ? uverbs_cleanup_ucontext+0x168/0x730
       ? console_unlock+0x502/0xbd0
       print_circular_bug.isra.24+0x35e/0x396
       ? print_circular_bug_header+0x12e/0x12e
       ? find_usage_backwards+0x30/0x30
       ? entry_SYSCALL_64_fastpath+0x1e/0x8b
       validate_chain.isra.28+0x25d1/0x40c0
       ? check_usage+0xb70/0xb70
       ? graph_lock+0x160/0x160
       ? find_usage_backwards+0x30/0x30
       ? cyc2ns_read_end+0x10/0x10
       ? print_irqtrace_events+0x280/0x280
       ? __lock_acquire+0x93d/0x1630
       __lock_acquire+0x93d/0x1630
       lock_acquire+0x19d/0x440
       ? uverbs_free_xrcd+0xd2/0x360
       __mutex_lock+0x111/0x1720
       ? uverbs_free_xrcd+0xd2/0x360
       ? uverbs_free_xrcd+0xd2/0x360
       ? __mutex_lock+0x828/0x1720
       ? mutex_lock_io_nested+0x1550/0x1550
       ? uverbs_cleanup_ucontext+0x168/0x730
       ? __lock_acquire+0x9a9/0x1630
       ? mutex_lock_io_nested+0x1550/0x1550
       ? uverbs_cleanup_ucontext+0xf6/0x730
       ? lock_contended+0x11a0/0x11a0
       ? uverbs_free_xrcd+0xd2/0x360
       uverbs_free_xrcd+0xd2/0x360
       remove_commit_idr_uobject+0x6d/0x110
       uverbs_cleanup_ucontext+0x2f0/0x730
       ? sched_clock_cpu+0x18/0x200
       ? uverbs_close_fd+0x1c0/0x1c0
       ib_uverbs_cleanup_ucontext.constprop.3+0x52/0x120
       ib_uverbs_close+0xf2/0x570
       ? ib_uverbs_remove_one+0xb50/0xb50
       ? ib_uverbs_remove_one+0xb50/0xb50
       __fput+0x2cd/0x8d0
       task_work_run+0xec/0x1d0
       do_exit+0x6a1/0x1520
       ? fsnotify_first_mark+0x220/0x220
       ? exit_notify+0x9f0/0x9f0
       ? entry_SYSCALL_64_fastpath+0x5/0x8b
       ? entry_SYSCALL_64_fastpath+0x5/0x8b
       ? trace_hardirqs_on_thunk+0x1a/0x1c
       ? time_hardirqs_on+0x27/0x670
       ? time_hardirqs_off+0x27/0x490
       ? syscall_return_slowpath+0x6c/0x460
       ? entry_SYSCALL_64_fastpath+0x5/0x8b
       do_group_exit+0xe8/0x380
       SyS_exit_group+0x1e/0x20
       entry_SYSCALL_64_fastpath+0x1e/0x8b
      RIP: 0033:0x431ce9
      
      Cc: syzkaller <syzkaller@googlegroups.com>
      Cc: <stable@vger.kernel.org> # 4.11
      Fixes: fd3c7904
      
       ("IB/core: Change idr objects to use the new schema")
      Reported-by: default avatarNoa Osherovich <noaos@mellanox.com>
      Signed-off-by: default avatarLeon Romanovsky <leonro@mellanox.com>
      Signed-off-by: default avatarJason Gunthorpe <jgg@mellanox.com>
      1ff5325c
    • Leon Romanovsky's avatar
      RDMA/uverbs: Fix bad unlock balance in ib_uverbs_close_xrcd · 5c2e1c4f
      Leon Romanovsky authored
      There is no matching lock for this mutex. Git history suggests this is
      just a missed remnant from an earlier version of the function before
      this locking was moved into uverbs_free_xrcd.
      
      Originally this lock was protecting the xrcd_table_delete()
      
      =====================================
      WARNING: bad unlock balance detected!
      4.15.0+ #87 Not tainted
      -------------------------------------
      syzkaller223405/269 is trying to release lock (&uverbs_dev->xrcd_tree_mutex) at:
      [<00000000b8703372>] ib_uverbs_close_xrcd+0x195/0x1f0
      but there are no more locks to release!
      
      other info that might help us debug this:
      1 lock held by syzkaller223405/269:
       #0:  (&uverbs_dev->disassociate_srcu){....}, at: [<000000005af3b960>] ib_uverbs_write+0x265/0xef0
      
      stack backtrace:
      CPU: 0 PID: 269 Comm: syzkaller223405 Not tainted 4.15.0+ #87
      Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.7.5-0-ge51488c-20140602_164612-nilsson.home.kraxel.org 04/01/2014
      Call Trace:
       dump_stack+0xde/0x164
       ? dma_virt_map_sg+0x22c/0x22c
       ? ib_uverbs_write+0x265/0xef0
       ? console_unlock+0x502/0xbd0
       ? ib_uverbs_close_xrcd+0x195/0x1f0
       print_unlock_imbalance_bug+0x131/0x160
       lock_release+0x59d/0x1100
       ? ib_uverbs_close_xrcd+0x195/0x1f0
       ? lock_acquire+0x440/0x440
       ? lock_acquire+0x440/0x440
       __mutex_unlock_slowpath+0x88/0x670
       ? wait_for_completion+0x4c0/0x4c0
       ? rdma_lookup_get_uobject+0x145/0x2f0
       ib_uverbs_close_xrcd+0x195/0x1f0
       ? ib_uverbs_open_xrcd+0xdd0/0xdd0
       ib_uverbs_write+0x7f9/0xef0
       ? cyc2ns_read_end+0x10/0x10
       ? ib_uverbs_open_xrcd+0xdd0/0xdd0
       ? uverbs_devnode+0x110/0x110
       ? cyc2ns_read_end+0x10/0x10
       ? cyc2ns_read_end+0x10/0x10
       ? sched_clock_cpu+0x18/0x200
       __vfs_write+0x10d/0x700
       ? uverbs_devnode+0x110/0x110
       ? kernel_read+0x170/0x170
       ? __fget+0x358/0x5d0
       ? security_file_permission+0x93/0x260
       vfs_write+0x1b0/0x550
       SyS_write+0xc7/0x1a0
       ? SyS_read+0x1a0/0x1a0
       ? trace_hardirqs_on_thunk+0x1a/0x1c
       entry_SYSCALL_64_fastpath+0x1e/0x8b
      RIP: 0033:0x4335c9
      
      Cc: syzkaller <syzkaller@googlegroups.com>
      Cc: <stable@vger.kernel.org> # 4.11
      Fixes: fd3c7904
      
       ("IB/core: Change idr objects to use the new schema")
      Reported-by: default avatarNoa Osherovich <noaos@mellanox.com>
      Signed-off-by: default avatarLeon Romanovsky <leonro@mellanox.com>
      Signed-off-by: default avatarJason Gunthorpe <jgg@mellanox.com>
      5c2e1c4f
    • Leon Romanovsky's avatar
      RDMA/restrack: Increment CQ restrack object before committing · 0cba0efc
      Leon Romanovsky authored
      Once the uobj is committed it is immediately possible another thread
      could destroy it, which worst case, can result in a use-after-free
      of the restrack objects.
      
      Cc: syzkaller <syzkaller@googlegroups.com>
      Fixes: 08f294a1
      
       ("RDMA/core: Add resource tracking for create and destroy CQs")
      Reported-by: default avatarNoa Osherovich <noaos@mellanox.com>
      Signed-off-by: default avatarLeon Romanovsky <leonro@mellanox.com>
      Signed-off-by: default avatarJason Gunthorpe <jgg@mellanox.com>
      0cba0efc
    • Leon Romanovsky's avatar
      RDMA/uverbs: Protect from command mask overflow · 3f802b16
      Leon Romanovsky authored
      The command number is not bounds checked against the command mask before it
      is shifted, resulting in an ubsan hit. This does not cause malfunction since
      the command number is eventually bounds checked, but we can make this ubsan
      clean by moving the bounds check to before the mask check.
      
      ================================================================================
      UBSAN: Undefined behaviour in
      drivers/infiniband/core/uverbs_main.c:647:21
      shift exponent 207 is too large for 64-bit type 'long long unsigned int'
      CPU: 0 PID: 446 Comm: syz-executor3 Not tainted 4.15.0-rc2+ #61
      Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
      rel-1.7.5-0-ge51488c-20140602_164612-nilsson.home.kraxel.org 04/01/2014
      Call Trace:
      dump_stack+0xde/0x164
      ? dma_virt_map_sg+0x22c/0x22c
      ubsan_epilogue+0xe/0x81
      __ubsan_handle_shift_out_of_bounds+0x293/0x2f7
      ? debug_check_no_locks_freed+0x340/0x340
      ? __ubsan_handle_load_invalid_value+0x19b/0x19b
      ? lock_acquire+0x440/0x440
      ? lock_acquire+0x19d/0x440
      ? __might_fault+0xf4/0x240
      ? ib_uverbs_write+0x68d/0xe20
      ib_uverbs_write+0x68d/0xe20
      ? __lock_acquire+0xcf7/0x3940
      ? uverbs_devnode+0x110/0x110
      ? cyc2ns_read_end+0x10/0x10
      ? sched_clock_cpu+0x18/0x200
      ? sched_clock_cpu+0x18/0x200
      __vfs_write+0x10d/0x700
      ? uverbs_devnode+0x110/0x110
      ? kernel_read+0x170/0x170
      ? __fget+0x35b/0x5d0
      ? security_file_permission+0x93/0x260
      vfs_write+0x1b0/0x550
      SyS_write+0xc7/0x1a0
      ? SyS_read+0x1a0/0x1a0
      ? trace_hardirqs_on_thunk+0x1a/0x1c
      entry_SYSCALL_64_fastpath+0x18/0x85
      RIP: 0033:0x448e29
      RSP: 002b:00007f033f567c58 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
      RAX: ffffffffffffffda RBX: 00007f033f5686bc RCX: 0000000000448e29
      RDX: 0000000000000060 RSI: 0000000020001000 RDI: 0000000000000012
      RBP: 000000000070bea0 R08: 0000000000000000 R09: 0000000000000000
      R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
      R13: 00000000000056a0 R14: 00000000006e8740 R15: 0000000000000000
      ================================================================================
      
      Cc: syzkaller <syzkaller@googlegroups.com>
      Cc: <stable@vger.kernel.org> # 4.5
      Fixes: 2dbd5186
      
       ("IB/core: IB/core: Allow legacy verbs through extended interfaces")
      Reported-by: default avatarNoa Osherovich <noaos@mellanox.com>
      Reviewed-by: default avatarMatan Barak <matanb@mellanox.com>
      Signed-off-by: default avatarLeon Romanovsky <leonro@mellanox.com>
      Signed-off-by: default avatarJason Gunthorpe <jgg@mellanox.com>
      3f802b16
    • Jason Gunthorpe's avatar
      IB/uverbs: Fix unbalanced unlock on error path for rdma_explicit_destroy · ec6f8401
      Jason Gunthorpe authored
      If remove_commit fails then the lock is left locked while the uobj still
      exists. Eventually the kernel will deadlock.
      
      lockdep detects this and says:
      
       test/4221 is leaving the kernel with locks still held!
       1 lock held by test/4221:
        #0:  (&ucontext->cleanup_rwsem){.+.+}, at: [<000000001e5c7523>] rdma_explicit_destroy+0x37/0x120 [ib_uverbs]
      
      Fixes: 4da70da2
      
       ("IB/core: Explicitly destroy an object while keeping uobject")
      Signed-off-by: default avatarLeon Romanovsky <leon@kernel.org>
      Reviewed-by: default avatarDennis Dalessandro <dennis.dalessandro@intel.com>
      Signed-off-by: default avatarJason Gunthorpe <jgg@mellanox.com>
      ec6f8401
    • Jason Gunthorpe's avatar
      IB/uverbs: Improve lockdep_check · 104f268d
      Jason Gunthorpe authored
      This is really being used as an assert that the expected usecnt
      is being held and implicitly that the usecnt is valid. Rename it to
      assert_uverbs_usecnt and tighten the checks to only accept valid
      values of usecnt (eg 0 and < -1 are invalid).
      
      The tigher checkes make the assertion cover more cases and is more
      likely to find bugs via syzkaller/etc.
      
      Fixes: 38321256
      
       ("IB/core: Add support for idr types")
      Signed-off-by: default avatarLeon Romanovsky <leon@kernel.org>
      Signed-off-by: default avatarJason Gunthorpe <jgg@mellanox.com>
      104f268d
    • Leon Romanovsky's avatar
      RDMA/uverbs: Protect from races between lookup and destroy of uobjects · 6623e3e3
      Leon Romanovsky authored
      The race is between lookup_get_idr_uobject and
      uverbs_idr_remove_uobj -> uverbs_uobject_put.
      
      We deliberately do not call sychronize_rcu after the idr_remove in
      uverbs_idr_remove_uobj for performance reasons, instead we call
      kfree_rcu() during uverbs_uobject_put.
      
      However, this means we can obtain pointers to uobj's that have
      already been released and must protect against krefing them
      using kref_get_unless_zero.
      
      ==================================================================
      BUG: KASAN: use-after-free in copy_ah_attr_from_uverbs.isra.2+0x860/0xa00
      Read of size 4 at addr ffff88005fda1ac8 by task syz-executor2/441
      
      CPU: 1 PID: 441 Comm: syz-executor2 Not tainted 4.15.0-rc2+ #56
      Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
      rel-1.7.5-0-ge51488c-20140602_164612-nilsson.home.kraxel.org 04/01/2014
      Call Trace:
      dump_stack+0x8d/0xd4
      print_address_description+0x73/0x290
      kasan_report+0x25c/0x370
      ? copy_ah_attr_from_uverbs.isra.2+0x860/0xa00
      copy_ah_attr_from_uverbs.isra.2+0x860/0xa00
      ? uverbs_try_lock_object+0x68/0xc0
      ? modify_qp.isra.7+0xdc4/0x10e0
      modify_qp.isra.7+0xdc4/0x10e0
      ib_uverbs_modify_qp+0xfe/0x170
      ? ib_uverbs_query_qp+0x970/0x970
      ? __lock_acquire+0xa11/0x1da0
      ib_uverbs_write+0x55a/0xad0
      ? ib_uverbs_query_qp+0x970/0x970
      ? ib_uverbs_query_qp+0x970/0x970
      ? ib_uverbs_open+0x760/0x760
      ? futex_wake+0x147/0x410
      ? sched_clock_cpu+0x18/0x180
      ? check_prev_add+0x1680/0x1680
      ? do_futex+0x3b6/0xa30
      ? sched_clock_cpu+0x18/0x180
      __vfs_write+0xf7/0x5c0
      ? ib_uverbs_open+0x760/0x760
      ? kernel_read+0x110/0x110
      ? lock_acquire+0x370/0x370
      ? __fget+0x264/0x3b0
      vfs_write+0x18a/0x460
      SyS_write+0xc7/0x1a0
      ? SyS_read+0x1a0/0x1a0
      ? trace_hardirqs_on_thunk+0x1a/0x1c
      entry_SYSCALL_64_fastpath+0x18/0x85
      RIP: 0033:0x448e29
      RSP: 002b:00007f443fee0c58 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
      RAX: ffffffffffffffda RBX: 00007f443fee16bc RCX: 0000000000448e29
      RDX: 0000000000000078 RSI: 00000000209f8000 RDI: 0000000000000012
      RBP: 000000000070bea0 R08: 0000000000000000 R09: 0000000000000000
      R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
      R13: 0000000000008e98 R14: 00000000006ebf38 R15: 0000000000000000
      
      Allocated by task 1:
      kmem_cache_alloc_trace+0x16c/0x2f0
      mlx5_alloc_cmd_msg+0x12e/0x670
      cmd_exec+0x419/0x1810
      mlx5_cmd_exec+0x40/0x70
      mlx5_core_mad_ifc+0x187/0x220
      mlx5_MAD_IFC+0xd7/0x1b0
      mlx5_query_mad_ifc_gids+0x1f3/0x650
      mlx5_ib_query_gid+0xa4/0xc0
      ib_query_gid+0x152/0x1a0
      ib_query_port+0x21e/0x290
      mlx5_port_immutable+0x30f/0x490
      ib_register_device+0x5dd/0x1130
      mlx5_ib_add+0x3e7/0x700
      mlx5_add_device+0x124/0x510
      mlx5_register_interface+0x11f/0x1c0
      mlx5_ib_init+0x56/0x61
      do_one_initcall+0xa3/0x250
      kernel_init_freeable+0x309/0x3b8
      kernel_init+0x14/0x180
      ret_from_fork+0x24/0x30
      
      Freed by task 1:
      kfree+0xeb/0x2f0
      mlx5_free_cmd_msg+0xcd/0x140
      cmd_exec+0xeba/0x1810
      mlx5_cmd_exec+0x40/0x70
      mlx5_core_mad_ifc+0x187/0x220
      mlx5_MAD_IFC+0xd7/0x1b0
      mlx5_query_mad_ifc_gids+0x1f3/0x650
      mlx5_ib_query_gid+0xa4/0xc0
      ib_query_gid+0x152/0x1a0
      ib_query_port+0x21e/0x290
      mlx5_port_immutable+0x30f/0x490
      ib_register_device+0x5dd/0x1130
      mlx5_ib_add+0x3e7/0x700
      mlx5_add_device+0x124/0x510
      mlx5_register_interface+0x11f/0x1c0
      mlx5_ib_init+0x56/0x61
      do_one_initcall+0xa3/0x250
      kernel_init_freeable+0x309/0x3b8
      kernel_init+0x14/0x180
      ret_from_fork+0x24/0x30
      
      The buggy address belongs to the object at ffff88005fda1ab0
      which belongs to the cache kmalloc-32 of size 32
      The buggy address is located 24 bytes inside of
      32-byte region [ffff88005fda1ab0, ffff88005fda1ad0)
      The buggy address belongs to the page:
      page:00000000d5655c19 count:1 mapcount:0 mapping: (null)
      index:0xffff88005fda1fc0
      flags: 0x4000000000000100(slab)
      raw: 4000000000000100 0000000000000000 ffff88005fda1fc0 0000000180550008
      raw: ffffea00017f6780 0000000400000004 ffff88006c803980 0000000000000000
      page dumped because: kasan: bad access detected
      
      Memory state around the buggy address:
      ffff88005fda1980: fc fc fb fb fb fb fc fc fb fb fb fb fc fc fb fb
      ffff88005fda1a00: fb fb fc fc fb fb fb fb fc fc 00 00 00 00 fc fc
      ffff88005fda1a80: fb fb fb fb fc fc fb fb fb fb fc fc fb fb fb fb
      ffff88005fda1b00: fc fc 00 00 00 00 fc fc fb fb fb fb fc fc fb fb
      ffff88005fda1b80: fb fb fc fc fb fb fb fb fc fc fb fb fb fb fc fc
      ==================================================================@
      
      Cc: syzkaller <syzkaller@googlegroups.com>
      Cc: <stable@vger.kernel.org> # 4.11
      Fixes: 38321256
      
       ("IB/core: Add support for idr types")
      Reported-by: default avatarNoa Osherovich <noaos@mellanox.com>
      Signed-off-by: default avatarLeon Romanovsky <leonro@mellanox.com>
      Signed-off-by: default avatarJason Gunthorpe <jgg@mellanox.com>
      6623e3e3