Skip to content

L
linux
Switch branch/tag
  1. 31 May, 2019 16 commits
    • YueHaibing's avatar
      media: cpia2: Fix use-after-free in cpia2_exit · 14734c3c
      YueHaibing authored 
      commit dea37a97 upstream.

Syzkaller report this:

BUG: KASAN: use-after-free in sysfs_remove_file_ns+0x5f/0x70 fs/sysfs/file.c:468
Read of size 8 at addr ffff8881f59a6b70 by task syz-executor.0/8363

CPU: 0 PID: 8363 Comm: syz-executor.0 Not tainted 5.0.0-rc8+ #3
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0xfa/0x1ce lib/dump_stack.c:113
 print_address_description+0x65/0x270 mm/kasan/report.c:187
 kasan_report+0x149/0x18d mm/kasan/report.c:317
 sysfs_remove_file_ns+0x5f/0x70 fs/sysfs/file.c:468
 sysfs_remove_file include/linux/sysfs.h:519 [inline]
 driver_remove_file+0x40/0x50 drivers/base/driver.c:122
 usb_remove_newid_files drivers/usb/core/driver.c:212 [inline]
 usb_deregister+0x12a/0x3b0 drivers/usb/core/driver.c:1005
 cpia2_exit+0xa/0x16 [cpia2]
 __do_sys_delete_module kernel/module.c:1018 [inline]
 __se_sys_delete_module kernel/module.c:961 [inline]
 __x64_sys_delete_module+0x3dc/0x5e0 kernel/module.c:961
 do_syscall_64+0x147/0x600 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x462e99
Code: f7 d8 64 89 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f86f3754c58 EFLAGS: 00000246 ORIG_RAX: 00000000000000b0
RAX: ffffffffffffffda RBX: 000000000073bf00 RCX: 0000000000462e99
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000300
RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f86f37556bc
R13: 00000000004bcca9 R14: 00000000006f6b48 R15: 00000000ffffffff

Allocated by task 8363:
 set_track mm/kasan/common.c:85 [inline]
 __kasan_kmalloc.constprop.3+0xa0/0xd0 mm/kasan/common.c:495
 kmalloc include/linux/slab.h:545 [inline]
 kzalloc include/linux/slab.h:740 [inline]
 bus_add_driver+0xc0/0x610 drivers/base/bus.c:651
 driver_register+0x1bb/0x3f0 drivers/base/driver.c:170
 usb_register_driver+0x267/0x520 drivers/usb/core/driver.c:965
 0xffffffffc1b4817c
 do_one_initcall+0xfa/0x5ca init/main.c:887
 do_init_module+0x204/0x5f6 kernel/module.c:3460
 load_module+0x66b2/0x8570 kernel/module.c:3808
 __do_sys_finit_module+0x238/0x2a0 kernel/module.c:3902
 do_syscall_64+0x147/0x600 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 8363:
 set_track mm/kasan/common.c:85 [inline]
 __kasan_slab_free+0x130/0x180 mm/kasan/common.c:457
 slab_free_hook mm/slub.c:1430 [inline]
 slab_free_freelist_hook mm/slub.c:1457 [inline]
 slab_free mm/slub.c:3005 [inline]
 kfree+0xe1/0x270 mm/slub.c:3957
 kobject_cleanup lib/kobject.c:662 [inline]
 kobject_release lib/kobject.c:691 [inline]
 kref_put include/linux/kref.h:67 [inline]
 kobject_put+0x146/0x240 lib/kobject.c:708
 bus_remove_driver+0x10e/0x220 drivers/base/bus.c:732
 driver_unregister+0x6c/0xa0 drivers/base/driver.c:197
 usb_register_driver+0x341/0x520 drivers/usb/core/driver.c:980
 0xffffffffc1b4817c
 do_one_initcall+0xfa/0x5ca init/main.c:887
 do_init_module+0x204/0x5f6 kernel/module.c:3460
 load_module+0x66b2/0x8570 kernel/module.c:3808
 __do_sys_finit_module+0x238/0x2a0 kernel/module.c:3902
 do_syscall_64+0x147/0x600 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8881f59a6b40
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 48 bytes inside of
 256-byte region [ffff8881f59a6b40, ffff8881f59a6c40)
The buggy address belongs to the page:
page:ffffea0007d66980 count:1 mapcount:0 mapping:ffff8881f6c02e00 index:0x0
flags: 0x2fffc0000000200(slab)
raw: 02fffc0000000200 dead000000000100 dead000000000200 ffff8881f6c02e00
raw: 0000000000000000 00000000800c000c 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8881f59a6a00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881f59a6a80: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc
>ffff8881f59a6b00: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
                                                             ^
 ffff8881f59a6b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881f59a6c00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc

cpia2_init does not check return value of cpia2_init, if it failed
in usb_register_driver, there is already cleanup using driver_unregister.
No need call cpia2_usb_cleanup on module exit.
Reported-by: default avatarHulk Robot <hulkci@huawei.com>
Signed-off-by: default avatarYueHaibing <yuehaibing@huawei.com>
Signed-off-by: default avatarHans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      14734c3c
    • Jiufei Xue's avatar
      fbdev: fix WARNING in __alloc_pages_nodemask bug · d0c04be9
      Jiufei Xue authored 
      commit 8c40292b upstream.

Syzkaller hit 'WARNING in __alloc_pages_nodemask' bug.

WARNING: CPU: 1 PID: 1473 at mm/page_alloc.c:4377
__alloc_pages_nodemask+0x4da/0x2130
Kernel panic - not syncing: panic_on_warn set ...

Call Trace:
 alloc_pages_current+0xb1/0x1e0
 kmalloc_order+0x1f/0x60
 kmalloc_order_trace+0x1d/0x120
 fb_alloc_cmap_gfp+0x85/0x2b0
 fb_set_user_cmap+0xff/0x370
 do_fb_ioctl+0x949/0xa20
 fb_ioctl+0xdd/0x120
 do_vfs_ioctl+0x186/0x1070
 ksys_ioctl+0x89/0xa0
 __x64_sys_ioctl+0x74/0xb0
 do_syscall_64+0xc8/0x550
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

This is a warning about order >= MAX_ORDER and the order is from
userspace ioctl. Add flag __NOWARN to silence this warning.
Signed-off-by: default avatarJiufei Xue <jiufei.xue@linux.alibaba.com>
Signed-off-by: default avatarBartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      d0c04be9
    • Mike Kravetz's avatar
      hugetlb: use same fault hash key for shared and private mappings · f0539c70
      Mike Kravetz authored 
      commit 1b426bac upstream.

hugetlb uses a fault mutex hash table to prevent page faults of the
same pages concurrently.  The key for shared and private mappings is
different.  Shared keys off address_space and file index.  Private keys
off mm and virtual address.  Consider a private mappings of a populated
hugetlbfs file.  A fault will map the page from the file and if needed
do a COW to map a writable page.

Hugetlbfs hole punch uses the fault mutex to prevent mappings of file
pages.  It uses the address_space file index key.  However, private
mappings will use a different key and could race with this code to map
the file page.  This causes problems (BUG) for the page cache remove
code as it expects the page to be unmapped.  A sample stack is:

page dumped because: VM_BUG_ON_PAGE(page_mapped(page))
kernel BUG at mm/filemap.c:169!
...
RIP: 0010:unaccount_page_cache_page+0x1b8/0x200
...
Call Trace:
__delete_from_page_cache+0x39/0x220
delete_from_page_cache+0x45/0x70
remove_inode_hugepages+0x13c/0x380
? __add_to_page_cache_locked+0x162/0x380
hugetlbfs_fallocate+0x403/0x540
? _cond_resched+0x15/0x30
? __inode_security_revalidate+0x5d/0x70
? selinux_file_permission+0x100/0x130
vfs_fallocate+0x13f/0x270
ksys_fallocate+0x3c/0x80
__x64_sys_fallocate+0x1a/0x20
do_syscall_64+0x5b/0x180
entry_SYSCALL_64_after_hwframe+0x44/0xa9

There seems to be another potential COW issue/race with this approach
of different private and shared keys as noted in commit 8382d914
("mm, hugetlb: improve page-fault scalability").

Since every hugetlb mapping (even anon and private) is actually a file
mapping, just use the address_space index key for all mappings.  This
results in potentially more hash collisions.  However, this should not
be the common case.

Link: http://lkml.kernel.org/r/20190328234704.27083-3-mike.kravetz@oracle.com
Link: http://lkml.kernel.org/r/20190412165235.t4sscoujczfhuiyt@linux-r8p5
Fixes: b5cec28d ("hugetlbfs: truncate_hugepages() takes a range of pages")
Signed-off-by: default avatarMike Kravetz <mike.kravetz@oracle.com>
Reviewed-by: default avatarNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Reviewed-by: default avatarDavidlohr Bueso <dbueso@suse.de>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      f0539c70
    • Shile Zhang's avatar
      fbdev: fix divide error in fb_var_to_videomode · 45dbaee4
      Shile Zhang authored 
      commit cf84807f upstream.

To fix following divide-by-zero error found by Syzkaller:

  divide error: 0000 [#1] SMP PTI
  CPU: 7 PID: 8447 Comm: test Kdump: loaded Not tainted 4.19.24-8.al7.x86_64 #1
  Hardware name: Alibaba Cloud Alibaba Cloud ECS, BIOS rel-1.12.0-0-ga698c8995f-prebuilt.qemu.org 04/01/2014
  RIP: 0010:fb_var_to_videomode+0xae/0xc0
  Code: 04 44 03 46 78 03 4e 7c 44 03 46 68 03 4e 70 89 ce d1 ee 69 c0 e8 03 00 00 f6 c2 01 0f 45 ce 83 e2 02 8d 34 09 0f 45 ce 31 d2 <41> f7 f0 31 d2 f7 f1 89 47 08 f3 c3 66 0f 1f 44 00 00 0f 1f 44 00
  RSP: 0018:ffffb7e189347bf0 EFLAGS: 00010246
  RAX: 00000000e1692410 RBX: ffffb7e189347d60 RCX: 0000000000000000
  RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffb7e189347c10
  RBP: ffff99972a091c00 R08: 0000000000000000 R09: 0000000000000000
  R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000100
  R13: 0000000000010000 R14: 00007ffd66baf6d0 R15: 0000000000000000
  FS:  00007f2054d11740(0000) GS:ffff99972fbc0000(0000) knlGS:0000000000000000
  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  CR2: 00007f205481fd20 CR3: 00000004288a0001 CR4: 00000000001606a0
  Call Trace:
   fb_set_var+0x257/0x390
   ? lookup_fast+0xbb/0x2b0
   ? fb_open+0xc0/0x140
   ? chrdev_open+0xa6/0x1a0
   do_fb_ioctl+0x445/0x5a0
   do_vfs_ioctl+0x92/0x5f0
   ? __alloc_fd+0x3d/0x160
   ksys_ioctl+0x60/0x90
   __x64_sys_ioctl+0x16/0x20
   do_syscall_64+0x5b/0x190
   entry_SYSCALL_64_after_hwframe+0x44/0xa9
  RIP: 0033:0x7f20548258d7
  Code: 44 00 00 48 8b 05 b9 15 2d 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 89 15 2d 00 f7 d8 64 89 01 48

It can be triggered easily with following test code:

  #include <linux/fb.h>
  #include <fcntl.h>
  #include <sys/ioctl.h>
  int main(void)
  {
          struct fb_var_screeninfo var = {.activate = 0x100, .pixclock = 60};
          int fd = open("/dev/fb0", O_RDWR);
          if (fd < 0)
                  return 1;

          if (ioctl(fd, FBIOPUT_VSCREENINFO, &var))
                  return 1;

          return 0;
  }
Signed-off-by: default avatarShile Zhang <shile.zhang@linux.alibaba.com>
Cc: Fredrik Noring <noring@nocrew.org>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: default avatarMukesh Ojha <mojha@codeaurora.org>
Signed-off-by: default avatarBartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      45dbaee4
    • Tobin C. Harding's avatar
      btrfs: sysfs: don't leak memory when failing add fsid · e0c26e8a
      Tobin C. Harding authored 
      commit e3277335 upstream.

A failed call to kobject_init_and_add() must be followed by a call to
kobject_put().  Currently in the error path when adding fs_devices we
are missing this call.  This could be fixed by calling
btrfs_sysfs_remove_fsid() if btrfs_sysfs_add_fsid() returns an error or
by adding a call to kobject_put() directly in btrfs_sysfs_add_fsid().
Here we choose the second option because it prevents the slightly
unusual error path handling requirements of kobject from leaking out
into btrfs functions.

Add a call to kobject_put() in the error path of kobject_add_and_init().
This causes the release method to be called if kobject_init_and_add()
fails.  open_tree() is the function that calls btrfs_sysfs_add_fsid()
and the error code in this function is already written with the
assumption that the release method is called during the error path of
open_tree() (as seen by the call to btrfs_sysfs_remove_fsid() under the
fail_fsdev_sysfs label).

Cc: stable@vger.kernel.org # v4.4+
Reviewed-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: default avatarTobin C. Harding <tobin@kernel.org>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      e0c26e8a
    • Filipe Manana's avatar
      Btrfs: fix race between ranged fsync and writeback of adjacent ranges · 88522174
      Filipe Manana authored 
      commit 0c713cba upstream.

When we do a full fsync (the bit BTRFS_INODE_NEEDS_FULL_SYNC is set in the
inode) that happens to be ranged, which happens during a msync() or writes
for files opened with O_SYNC for example, we can end up with a corrupt log,
due to different file extent items representing ranges that overlap with
each other, or hit some assertion failures.

When doing a ranged fsync we only flush delalloc and wait for ordered
exents within that range. If while we are logging items from our inode
ordered extents for adjacent ranges complete, we end up in a race that can
make us insert the file extent items that overlap with others we logged
previously and the assertion failures.

For example, if tree-log.c:copy_items() receives a leaf that has the
following file extents items, all with a length of 4K and therefore there
is an implicit hole in the range 68K to 72K - 1:

  (257 EXTENT_ITEM 64K), (257 EXTENT_ITEM 72K), (257 EXTENT_ITEM 76K), ...

It copies them to the log tree. However due to the need to detect implicit
holes, it may release the path, in order to look at the previous leaf to
detect an implicit hole, and then later it will search again in the tree
for the first file extent item key, with the goal of locking again the
leaf (which might have changed due to concurrent changes to other inodes).

However when it locks again the leaf containing the first key, the key
corresponding to the extent at offset 72K may not be there anymore since
there is an ordered extent for that range that is finishing (that is,
somewhere in the middle of btrfs_finish_ordered_io()), and it just
removed the file extent item but has not yet replaced it with a new file
extent item, so the part of copy_items() that does hole detection will
decide that there is a hole in the range starting from 68K to 76K - 1,
and therefore insert a file extent item to represent that hole, having
a key offset of 68K. After that we now have a log tree with 2 different
extent items that have overlapping ranges:

 1) The file extent item copied before copy_items() released the path,
    which has a key offset of 72K and a length of 4K, representing the
    file range 72K to 76K - 1.

 2) And a file extent item representing a hole that has a key offset of
    68K and a length of 8K, representing the range 68K to 76K - 1. This
    item was inserted after releasing the path, and overlaps with the
    extent item inserted before.

The overlapping extent items can cause all sorts of unpredictable and
incorrect behaviour, either when replayed or if a fast (non full) fsync
happens later, which can trigger a BUG_ON() when calling
btrfs_set_item_key_safe() through __btrfs_drop_extents(), producing a
trace like the following:

  [61666.783269] ------------[ cut here ]------------
  [61666.783943] kernel BUG at fs/btrfs/ctree.c:3182!
  [61666.784644] invalid opcode: 0000 [#1] PREEMPT SMP
  (...)
  [61666.786253] task: ffff880117b88c40 task.stack: ffffc90008168000
  [61666.786253] RIP: 0010:btrfs_set_item_key_safe+0x7c/0xd2 [btrfs]
  [61666.786253] RSP: 0018:ffffc9000816b958 EFLAGS: 00010246
  [61666.786253] RAX: 0000000000000000 RBX: 000000000000000f RCX: 0000000000030000
  [61666.786253] RDX: 0000000000000000 RSI: ffffc9000816ba4f RDI: ffffc9000816b937
  [61666.786253] RBP: ffffc9000816b998 R08: ffff88011dae2428 R09: 0000000000001000
  [61666.786253] R10: 0000160000000000 R11: 6db6db6db6db6db7 R12: ffff88011dae2418
  [61666.786253] R13: ffffc9000816ba4f R14: ffff8801e10c4118 R15: ffff8801e715c000
  [61666.786253] FS:  00007f6060a18700(0000) GS:ffff88023f5c0000(0000) knlGS:0000000000000000
  [61666.786253] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [61666.786253] CR2: 00007f6060a28000 CR3: 0000000213e69000 CR4: 00000000000006e0
  [61666.786253] Call Trace:
  [61666.786253]  __btrfs_drop_extents+0x5e3/0xaad [btrfs]
  [61666.786253]  ? time_hardirqs_on+0x9/0x14
  [61666.786253]  btrfs_log_changed_extents+0x294/0x4e0 [btrfs]
  [61666.786253]  ? release_extent_buffer+0x38/0xb4 [btrfs]
  [61666.786253]  btrfs_log_inode+0xb6e/0xcdc [btrfs]
  [61666.786253]  ? lock_acquire+0x131/0x1c5
  [61666.786253]  ? btrfs_log_inode_parent+0xee/0x659 [btrfs]
  [61666.786253]  ? arch_local_irq_save+0x9/0xc
  [61666.786253]  ? btrfs_log_inode_parent+0x1f5/0x659 [btrfs]
  [61666.786253]  btrfs_log_inode_parent+0x223/0x659 [btrfs]
  [61666.786253]  ? arch_local_irq_save+0x9/0xc
  [61666.786253]  ? lockref_get_not_zero+0x2c/0x34
  [61666.786253]  ? rcu_read_unlock+0x3e/0x5d
  [61666.786253]  btrfs_log_dentry_safe+0x60/0x7b [btrfs]
  [61666.786253]  btrfs_sync_file+0x317/0x42c [btrfs]
  [61666.786253]  vfs_fsync_range+0x8c/0x9e
  [61666.786253]  SyS_msync+0x13c/0x1c9
  [61666.786253]  entry_SYSCALL_64_fastpath+0x18/0xad

A sample of a corrupt log tree leaf with overlapping extents I got from
running btrfs/072:

      item 14 key (295 108 200704) itemoff 2599 itemsize 53
              extent data disk bytenr 0 nr 0
              extent data offset 0 nr 458752 ram 458752
      item 15 key (295 108 659456) itemoff 2546 itemsize 53
              extent data disk bytenr 4343541760 nr 770048
              extent data offset 606208 nr 163840 ram 770048
      item 16 key (295 108 663552) itemoff 2493 itemsize 53
              extent data disk bytenr 4343541760 nr 770048
              extent data offset 610304 nr 155648 ram 770048
      item 17 key (295 108 819200) itemoff 2440 itemsize 53
              extent data disk bytenr 4334788608 nr 4096
              extent data offset 0 nr 4096 ram 4096

The file extent item at offset 659456 (item 15) ends at offset 823296
(659456 + 163840) while the next file extent item (item 16) starts at
offset 663552.

Another different problem that the race can trigger is a failure in the
assertions at tree-log.c:copy_items(), which expect that the first file
extent item key we found before releasing the path exists after we have
released path and that the last key we found before releasing the path
also exists after releasing the path:

  $ cat -n fs/btrfs/tree-log.c
  4080          if (need_find_last_extent) {
  4081                  /* btrfs_prev_leaf could return 1 without releasing the path */
  4082                  btrfs_release_path(src_path);
  4083                  ret = btrfs_search_slot(NULL, inode->root, &first_key,
  4084                                  src_path, 0, 0);
  4085                  if (ret < 0)
  4086                          return ret;
  4087                  ASSERT(ret == 0);
  (...)
  4103                  if (i >= btrfs_header_nritems(src_path->nodes[0])) {
  4104                          ret = btrfs_next_leaf(inode->root, src_path);
  4105                          if (ret < 0)
  4106                                  return ret;
  4107                          ASSERT(ret == 0);
  4108                          src = src_path->nodes[0];
  4109                          i = 0;
  4110                          need_find_last_extent = true;
  4111                  }
  (...)

The second assertion implicitly expects that the last key before the path
release still exists, because the surrounding while loop only stops after
we have found that key. When this assertion fails it produces a stack like
this:

  [139590.037075] assertion failed: ret == 0, file: fs/btrfs/tree-log.c, line: 4107
  [139590.037406] ------------[ cut here ]------------
  [139590.037707] kernel BUG at fs/btrfs/ctree.h:3546!
  [139590.038034] invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC PTI
  [139590.038340] CPU: 1 PID: 31841 Comm: fsstress Tainted: G        W         5.0.0-btrfs-next-46 #1
  (...)
  [139590.039354] RIP: 0010:assfail.constprop.24+0x18/0x1a [btrfs]
  (...)
  [139590.040397] RSP: 0018:ffffa27f48f2b9b0 EFLAGS: 00010282
  [139590.040730] RAX: 0000000000000041 RBX: ffff897c635d92c8 RCX: 0000000000000000
  [139590.041105] RDX: 0000000000000000 RSI: ffff897d36a96868 RDI: ffff897d36a96868
  [139590.041470] RBP: ffff897d1b9a0708 R08: 0000000000000000 R09: 0000000000000000
  [139590.041815] R10: 0000000000000008 R11: 0000000000000000 R12: 0000000000000013
  [139590.042159] R13: 0000000000000227 R14: ffff897cffcbba88 R15: 0000000000000001
  [139590.042501] FS:  00007f2efc8dee80(0000) GS:ffff897d36a80000(0000) knlGS:0000000000000000
  [139590.042847] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [139590.043199] CR2: 00007f8c064935e0 CR3: 0000000232252002 CR4: 00000000003606e0
  [139590.043547] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
  [139590.043899] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
  [139590.044250] Call Trace:
  [139590.044631]  copy_items+0xa3f/0x1000 [btrfs]
  [139590.045009]  ? generic_bin_search.constprop.32+0x61/0x200 [btrfs]
  [139590.045396]  btrfs_log_inode+0x7b3/0xd70 [btrfs]
  [139590.045773]  btrfs_log_inode_parent+0x2b3/0xce0 [btrfs]
  [139590.046143]  ? do_raw_spin_unlock+0x49/0xc0
  [139590.046510]  btrfs_log_dentry_safe+0x4a/0x70 [btrfs]
  [139590.046872]  btrfs_sync_file+0x3b6/0x440 [btrfs]
  [139590.047243]  btrfs_file_write_iter+0x45b/0x5c0 [btrfs]
  [139590.047592]  __vfs_write+0x129/0x1c0
  [139590.047932]  vfs_write+0xc2/0x1b0
  [139590.048270]  ksys_write+0x55/0xc0
  [139590.048608]  do_syscall_64+0x60/0x1b0
  [139590.048946]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
  [139590.049287] RIP: 0033:0x7f2efc4be190
  (...)
  [139590.050342] RSP: 002b:00007ffe743243a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
  [139590.050701] RAX: ffffffffffffffda RBX: 0000000000008d58 RCX: 00007f2efc4be190
  [139590.051067] RDX: 0000000000008d58 RSI: 00005567eca0f370 RDI: 0000000000000003
  [139590.051459] RBP: 0000000000000024 R08: 0000000000000003 R09: 0000000000008d60
  [139590.051863] R10: 0000000000000078 R11: 0000000000000246 R12: 0000000000000003
  [139590.052252] R13: 00000000003d3507 R14: 00005567eca0f370 R15: 0000000000000000
  (...)
  [139590.055128] ---[ end trace 193f35d0215cdeeb ]---

So fix this race between a full ranged fsync and writeback of adjacent
ranges by flushing all delalloc and waiting for all ordered extents to
complete before logging the inode. This is the simplest way to solve the
problem because currently the full fsync path does not deal with ranges
at all (it assumes a full range from 0 to LLONG_MAX) and it always needs
to look at adjacent ranges for hole detection. For use cases of ranged
fsyncs this can make a few fsyncs slower but on the other hand it can
make some following fsyncs to other ranges do less work or no need to do
anything at all. A full fsync is rare anyway and happens only once after
loading/creating an inode and once after less common operations such as a
shrinking truncate.

This is an issue that exists for a long time, and was often triggered by
generic/127, because it does mmap'ed writes and msync (which triggers a
ranged fsync). Adding support for the tree checker to detect overlapping
extents (next patch in the series) and trigger a WARN() when such cases
are found, and then calling btrfs_check_leaf_full() at the end of
btrfs_insert_file_extent() made the issue much easier to detect. Running
btrfs/072 with that change to the tree checker and making fsstress open
files always with O_SYNC made it much easier to trigger the issue (as
triggering it with generic/127 is very rare).

CC: stable@vger.kernel.org # 3.16+
Reviewed-by: default avatarJosef Bacik <josef@toxicpanda.com>
Signed-off-by: default avatarFilipe Manana <fdmanana@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      88522174
    • Filipe Manana's avatar
      Btrfs: do not abort transaction at btrfs_update_root() after failure to COW path · d2ceb477
      Filipe Manana authored 
      commit 72bd2323 upstream.

Currently when we fail to COW a path at btrfs_update_root() we end up
always aborting the transaction. However all the current callers of
btrfs_update_root() are able to deal with errors returned from it, many do
end up aborting the transaction themselves (directly or not, such as the
transaction commit path), other BUG_ON() or just gracefully cancel whatever
they were doing.

When syncing the fsync log, we call btrfs_update_root() through
tree-log.c:update_log_root(), and if it returns an -ENOSPC error, the log
sync code does not abort the transaction, instead it gracefully handles
the error and returns -EAGAIN to the fsync handler, so that it falls back
to a transaction commit. Any other error different from -ENOSPC, makes the
log sync code abort the transaction.

So remove the transaction abort from btrfs_update_log() when we fail to
COW a path to update the root item, so that if an -ENOSPC failure happens
we avoid aborting the current transaction and have a chance of the fsync
succeeding after falling back to a transaction commit.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=203413
Fixes: 79787eaa ("btrfs: replace many BUG_ONs with proper error handling")
Cc: stable@vger.kernel.org # 4.4+
Signed-off-by: default avatarFilipe Manana <fdmanana@suse.com>
Reviewed-by: default avatarAnand Jain <anand.jain@oracle.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      d2ceb477
    • Andreas Gruenbacher's avatar
      gfs2: Fix sign extension bug in gfs2_update_stats · f22537fe
      Andreas Gruenbacher authored 
      commit 5a5ec83d upstream.

Commit 4d207133 changed the types of the statistic values in struct
gfs2_lkstats from s64 to u64.  Because of that, what should be a signed
value in gfs2_update_stats turned into an unsigned value.  When shifted
right, we end up with a large positive value instead of a small negative
value, which results in an incorrect variance estimate.

Fixes: 4d207133 ("gfs2: Make statistics unsigned, suitable for use with do_div()")
Signed-off-by: default avatarAndreas Gruenbacher <agruenba@redhat.com>
Cc: stable@vger.kernel.org # v4.4+
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      f22537fe
    • Jean-Philippe Brucker's avatar
      arm64: Save and restore OSDLR_EL1 across suspend/resume · 235aeafb
      Jean-Philippe Brucker authored 
      commit 827a108e upstream.

When the CPU comes out of suspend, the firmware may have modified the OS
Double Lock Register. Save it in an unused slot of cpu_suspend_ctx, and
restore it on resume.

Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarJean-Philippe Brucker <jean-philippe.brucker@arm.com>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      235aeafb
    • Dan Williams's avatar
      libnvdimm/namespace: Fix label tracking error · ef27496f
      Dan Williams authored 
      commit c4703ce1 upstream.

Users have reported intermittent occurrences of DIMM initialization
failures due to duplicate allocations of address capacity detected in
the labels, or errors of the form below, both have the same root cause.

    nd namespace1.4: failed to track label: 0
    WARNING: CPU: 17 PID: 1381 at drivers/nvdimm/label.c:863

    RIP: 0010:__pmem_label_update+0x56c/0x590 [libnvdimm]
    Call Trace:
     ? nd_pmem_namespace_label_update+0xd6/0x160 [libnvdimm]
     nd_pmem_namespace_label_update+0xd6/0x160 [libnvdimm]
     uuid_store+0x17e/0x190 [libnvdimm]
     kernfs_fop_write+0xf0/0x1a0
     vfs_write+0xb7/0x1b0
     ksys_write+0x57/0xd0
     do_syscall_64+0x60/0x210

Unfortunately those reports were typically with a busy parallel
namespace creation / destruction loop making it difficult to see the
components of the bug. However, Jane provided a simple reproducer using
the work-in-progress sub-section implementation.

When ndctl is reconfiguring a namespace it may take an existing defunct
/ disabled namespace and reconfigure it with a new uuid and other
parameters. Critically namespace_update_uuid() takes existing address
resources and renames them for the new namespace to use / reconfigure as
it sees fit. The bug is that this rename only happens in the resource
tracking tree. Existing labels with the old uuid are not reaped leading
to a scenario where multiple active labels reference the same span of
address range.

Teach namespace_update_uuid() to flag any references to the old uuid for
reaping at the next label update attempt.

Cc: <stable@vger.kernel.org>
Fixes: bf9bccc1 ("libnvdimm: pmem label sets and namespace instantiation")
Link: https://github.com/pmem/ndctl/issues/91Reported-by: default avatarJane Chu <jane.chu@oracle.com>
Reported-by: default avatarJeff Moyer <jmoyer@redhat.com>
Reported-by: default avatarErwin Tsaur <erwin.tsaur@oracle.com>
Cc: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      ef27496f
    • Suthikulpanit, Suravee's avatar
      kvm: svm/avic: fix off-by-one in checking host APIC ID · 42fee5b3
      Suthikulpanit, Suravee authored 
      commit c9bcd3e3 upstream.

Current logic does not allow VCPU to be loaded onto CPU with
APIC ID 255. This should be allowed since the host physical APIC ID
field in the AVIC Physical APIC table entry is an 8-bit value,
and APIC ID 255 is valid in system with x2APIC enabled.
Instead, do not allow VCPU load if the host APIC ID cannot be
represented by an 8-bit value.

Also, use the more appropriate AVIC_PHYSICAL_ID_ENTRY_HOST_PHYSICAL_ID_MASK
instead of AVIC_MAX_PHYSICAL_ID_COUNT.
Signed-off-by: default avatarSuravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      42fee5b3
    • Daniel Axtens's avatar
      crypto: vmx - CTR: always increment IV as quadword · c636a885
      Daniel Axtens authored 
      commit 009b30ac upstream.

The kernel self-tests picked up an issue with CTR mode:
alg: skcipher: p8_aes_ctr encryption test failed (wrong result) on test vector 3, cfg="uneven misaligned splits, may sleep"

Test vector 3 has an IV of FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFD, so
after 3 increments it should wrap around to 0.

In the aesp8-ppc code from OpenSSL, there are two paths that
increment IVs: the bulk (8 at a time) path, and the individual
path which is used when there are fewer than 8 AES blocks to
process.

In the bulk path, the IV is incremented with vadduqm: "Vector
Add Unsigned Quadword Modulo", which does 128-bit addition.

In the individual path, however, the IV is incremented with
vadduwm: "Vector Add Unsigned Word Modulo", which instead
does 4 32-bit additions. Thus the IV would instead become
FFFFFFFFFFFFFFFFFFFFFFFF00000000, throwing off the result.

Use vadduqm.

This was probably a typo originally, what with q and w being
adjacent. It is a pretty narrow edge case: I am really
impressed by the quality of the kernel self-tests!

Fixes: 5c380d62 ("crypto: vmx - Add support for VMS instructions by ASM")
Cc: stable@vger.kernel.org
Signed-off-by: default avatarDaniel Axtens <dja@axtens.net>
Acked-by: default avatarNayna Jain <nayna@linux.ibm.com>
Tested-by: default avatarNayna Jain <nayna@linux.ibm.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      c636a885
    • Martin K. Petersen's avatar
      Revert "scsi: sd: Keep disk read-only when re-reading partition" · 33d816ad
      Martin K. Petersen authored 
      commit 8acf608e upstream.

This reverts commit 20bd1d02.

This patch introduced regressions for devices that come online in
read-only state and subsequently switch to read-write.

Given how the partition code is currently implemented it is not
possible to persist the read-only flag across a device revalidate
call. This may need to get addressed in the future since it is common
for user applications to proactively call BLKRRPART.

Reverting this commit will re-introduce a regression where a
device-initiated revalidate event will cause the admin state to be
forgotten. A separate patch will address this issue.

Fixes: 20bd1d02 ("scsi: sd: Keep disk read-only when re-reading partition")
Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      33d816ad
    • Andrea Parri's avatar
      bio: fix improper use of smp_mb__before_atomic() · 6aab0ad9
      Andrea Parri authored 
      commit f381c6a4 upstream.

This barrier only applies to the read-modify-write operations; in
particular, it does not apply to the atomic_set() primitive.

Replace the barrier with an smp_mb().

Fixes: dac56212 ("bio: skip atomic inc/dec of ->bi_cnt for most use cases")
Cc: stable@vger.kernel.org
Reported-by: default avatar"Paul E. McKenney" <paulmck@linux.ibm.com>
Reported-by: default avatarPeter Zijlstra <peterz@infradead.org>
Signed-off-by: default avatarAndrea Parri <andrea.parri@amarulasolutions.com>
Reviewed-by: default avatarMing Lei <ming.lei@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Ming Lei <ming.lei@redhat.com>
Cc: linux-block@vger.kernel.org
Cc: "Paul E. McKenney" <paulmck@linux.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      6aab0ad9
    • Paolo Bonzini's avatar
      KVM: x86: fix return value for reserved EFER · 11cf36c3
      Paolo Bonzini authored 
      commit 66f61c92 upstream.

Commit 11988499 ("KVM: x86: Skip EFER vs. guest CPUID checks for
host-initiated writes", 2019-04-02) introduced a "return false" in a
function returning int, and anyway set_efer has a "nonzero on error"
conventon so it should be returning 1.
Reported-by: default avatarPavel Machek <pavel@denx.de>
Fixes: 11988499 ("KVM: x86: Skip EFER vs. guest CPUID checks for host-initiated writes")
Cc: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      11cf36c3
    • Jan Kara's avatar
      ext4: do not delete unlinked inode from orphan list on failed truncate · e386c027
      Jan Kara authored 
      commit ee0ed02c upstream.

It is possible that unlinked inode enters ext4_setattr() (e.g. if
somebody calls ftruncate(2) on unlinked but still open file). In such
case we should not delete the inode from the orphan list if truncate
fails. Note that this is mostly a theoretical concern as filesystem is
corrupted if we reach this path anyway but let's be consistent in our
orphan handling.
Reviewed-by: default avatarIra Weiny <ira.weiny@intel.com>
Signed-off-by: default avatarJan Kara <jack@suse.cz>
Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      e386c027
  3. 25 May, 2019 24 commits
GitLab Nexedi Edition | About GitLab | About Nexedi | 沪ICP备2021021310号-2 | 沪ICP备2021021310号-7