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Yishai Hadas dfccdac657 IB/uverbs: Fix OOPs in uverbs_user_mmap_disassociate 
commit 7b21b69ab2 upstream.

The vma->vm_mm can become impossible to get before rdma_umap_close() is
called, in this case we must not try to get an mm that is already
undergoing process exit. In this case there is no need to wait for
anything as the VMA will be destroyed by another thread soon and is
already effectively 'unreachable' by userspace.

 BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
 PGD 800000012bc50067 P4D 800000012bc50067 PUD 129db5067 PMD 0
 Oops: 0000 [#1] SMP PTI
 CPU: 1 PID: 2050 Comm: bash Tainted: G        W  OE 4.20.0-rc6+ #3
 Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011
 RIP: 0010:__rb_erase_color+0xb9/0x280
 Code: 84 17 01 00 00 48 3b 68 10 0f 84 15 01 00 00 48 89
               58 08 48 89 de 48 89 ef 4c 89 e3 e8 90 84 22 00 e9 60 ff ff ff 48 8b 5d
               10 <f6> 03 01 0f 84 9c 00 00 00 48 8b 43 10 48 85 c0 74 09 f6 00 01 0f
 RSP: 0018:ffffbecfc090bab8 EFLAGS: 00010246
 RAX: ffff97616346cf30 RBX: 0000000000000000 RCX: 0000000000000101
 RDX: 0000000000000000 RSI: ffff97623b6ca828 RDI: ffff97621ef10828
 RBP: ffff97621ef10828 R08: ffff97621ef10828 R09: 0000000000000000
 R10: 0000000000000000 R11: 0000000000000000 R12: ffff97623b6ca838
 R13: ffffffffbb3fef50 R14: ffff97623b6ca828 R15: 0000000000000000
 FS:  00007f7a5c31d740(0000) GS:ffff97623bb00000(0000) knlGS:0000000000000000
 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 CR2: 0000000000000000 CR3: 000000011255a000 CR4: 00000000000006e0
 Call Trace:
  unlink_file_vma+0x3b/0x50
  free_pgtables+0xa1/0x110
  exit_mmap+0xca/0x1a0
  ? mlx5_ib_dealloc_pd+0x28/0x30 [mlx5_ib]
  mmput+0x54/0x140
  uverbs_user_mmap_disassociate+0xcc/0x160 [ib_uverbs]
  uverbs_destroy_ufile_hw+0xf7/0x120 [ib_uverbs]
  ib_uverbs_remove_one+0xea/0x240 [ib_uverbs]
  ib_unregister_device+0xfb/0x200 [ib_core]
  mlx5_ib_remove+0x51/0xe0 [mlx5_ib]
  mlx5_remove_device+0xc1/0xd0 [mlx5_core]
  mlx5_unregister_device+0x3d/0xb0 [mlx5_core]
  remove_one+0x2a/0x90 [mlx5_core]
  pci_device_remove+0x3b/0xc0
  device_release_driver_internal+0x16d/0x240
  unbind_store+0xb2/0x100
  kernfs_fop_write+0x102/0x180
  __vfs_write+0x36/0x1a0
  ? __alloc_fd+0xa9/0x170
  ? set_close_on_exec+0x49/0x70
  vfs_write+0xad/0x1a0
  ksys_write+0x52/0xc0
  do_syscall_64+0x5b/0x180
  entry_SYSCALL_64_after_hwframe+0x44/0xa9

Cc: <stable@vger.kernel.org> # 4.19
Fixes: 5f9794dc94 ("RDMA/ucontext: Add a core API for mmaping driver IO memory")
Signed-off-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2019-02-06 17:27:43 +01:00
arch arm64: hibernate: Clean the __hyp_text to PoC after resume 2019-02-06 17:27:41 +01:00
block block: use rcu_work instead of call_rcu to avoid sleep in softirq 2019-01-22 21:09:57 +01:00
certs export.h: remove VMLINUX_SYMBOL() and VMLINUX_SYMBOL_STR() 2018-08-22 23:21:44 +09:00
crypto crypto: ecc - regularize scalar for scalar multiplication 2019-01-26 09:20:41 +01:00
Documentation mm, proc: be more verbose about unstable VMA flags in /proc/<pid>/smaps 2019-01-26 09:20:51 +01:00
drivers IB/uverbs: Fix OOPs in uverbs_user_mmap_disassociate 2019-02-06 17:27:43 +01:00
firmware kbuild: remove all dummy assignments to obj- 2017-11-18 11:46:06 +09:00
fs gfs2: Revert "Fix loop in gfs2_rbm_find" 2019-02-06 17:27:42 +01:00
include net: tls: Save iv in tls_rec for async crypto requests 2019-02-06 17:27:38 +01:00
init kbuild: Disable LD_DEAD_CODE_DATA_ELIMINATION with ftrace & GCC <= 4.7 2019-01-22 21:09:54 +01:00
ipc ipc: IPCMNI limit check for semmni 2018-10-31 08:54:14 -07:00
kernel bpf: fix inner map masking to prevent oob under speculation 2019-01-31 08:15:45 +01:00
lib fix int_sqrt64() for very large numbers 2019-01-22 21:09:55 +01:00
LICENSES This is a fairly typical cycle for documentation. There's some welcome 2018-10-24 18:01:11 +01:00
mm Revert "mm, memory_hotplug: initialize struct pages for the full memory section" 2019-01-31 08:15:45 +01:00
net ipv6: Consider sk_bound_dev_if when binding a socket to an address 2019-02-06 17:27:39 +01:00
samples samples: bpf: fix: error handling regarding kprobe_events 2019-01-26 09:20:42 +01:00
scripts kconfig: fix memory leak when EOF is encountered in quotation 2019-01-26 09:20:46 +01:00
security selinux: always allow mounting submounts 2019-01-26 09:20:42 +01:00
sound ALSA: pcm: Fix tight loop of OSS capture stream 2019-02-06 17:27:42 +01:00
tools selftests/seccomp: Enhance per-arch ptrace syscall skip tests 2019-02-06 17:27:40 +01:00
usr initramfs: move gen_initramfs_list.sh from scripts/ to usr/ 2018-08-22 23:21:44 +09:00
virt KVM: arm/arm64: vgic: Fix off-by-one bug in vgic_get_irq() 2019-01-09 17:46:04 +01:00
.clang-format page cache: Convert find_get_pages_contig to XArray 2018-10-21 10:46:34 -04:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore Add hch to .get_maintainer.ignore 2015-08-21 14:30:10 -07:00
.gitattributes .gitattributes: set git diff driver for C source code files 2016-10-07 18:46:30 -07:00
.gitignore Kbuild updates for v4.17 (2nd) 2018-04-15 17:21:30 -07:00
.mailmap mailmap: Update email for Punit Agrawal 2018-11-05 10:02:11 +00:00
COPYING COPYING: use the new text with points to the license files 2018-03-23 12:41:45 -06:00
CREDITS MAINTAINERS: update entry for MMP platform 2018-12-03 12:39:57 -08:00
Kbuild Kbuild updates for v4.15 2017-11-17 17:45:29 -08:00
Kconfig kconfig: move the "Executable file formats" menu to fs/Kconfig.binfmt 2018-08-02 08:06:55 +09:00
MAINTAINERS Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-12-21 14:21:17 -08:00
Makefile Linux 4.20.6 2019-01-31 08:15:47 +01:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.