1. 22 May, 2019 40 commits
    • Kailang Yang's avatar
      ALSA: hda/realtek - Fixup headphone noise via runtime suspend · d018003e
      Kailang Yang authored
      commit dad3197d upstream.
      
      Dell platform with ALC298.
      system enter to runtime suspend. Headphone had noise.
      Let Headset Mic not shutup will solve this issue.
      
      [ Fixed minor coding style issues by tiwai ]
      Signed-off-by: default avatarKailang Yang <kailang@realtek.com>
      Cc: <stable@vger.kernel.org>
      Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      d018003e
    • Jeremy Soller's avatar
      ALSA: hda/realtek - Corrected fixup for System76 Gazelle (gaze14) · f15d4a25
      Jeremy Soller authored
      commit 891afcf2 upstream.
      
      A mistake was made in the identification of the four variants of the
      System76 Gazelle (gaze14). This patch corrects the PCI ID of the
      17-inch, GTX 1660 Ti variant from 0x8560 to 0x8551. This patch also
      adds the correct fixups for the 15-inch and 17-inch GTX 1650 variants
      with PCI IDs 0x8560 and 0x8561.
      
      Tests were done on all four variants ensuring full audio capability.
      
      Fixes: 80a5052d ("ALSA: hdea/realtek - Headset fixup for System76 Gazelle (gaze14)")
      Signed-off-by: default avatarJeremy Soller <jeremy@system76.com>
      Cc: <stable@vger.kernel.org>
      Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      f15d4a25
    • Jan Kara's avatar
      ext4: avoid panic during forced reboot due to aborted journal · e6d47828
      Jan Kara authored
      commit 2c1d0e36 upstream.
      
      Handling of aborted journal is a special code path different from
      standard ext4_error() one and it can call panic() as well. Commit
      1dc1097f ("ext4: avoid panic during forced reboot") forgot to update
      this path so fix that omission.
      
      Fixes: 1dc1097f ("ext4: avoid panic during forced reboot")
      Signed-off-by: default avatarJan Kara <jack@suse.cz>
      Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
      Cc: stable@kernel.org # 5.1
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      e6d47828
    • Sahitya Tummala's avatar
      ext4: fix use-after-free in dx_release() · fc0d59b2
      Sahitya Tummala authored
      commit 08fc98a4 upstream.
      
      The buffer_head (frames[0].bh) and it's corresping page can be
      potentially free'd once brelse() is done inside the for loop
      but before the for loop exits in dx_release(). It can be free'd
      in another context, when the page cache is flushed via
      drop_caches_sysctl_handler(). This results into below data abort
      when accessing info->indirect_levels in dx_release().
      
      Unable to handle kernel paging request at virtual address ffffffc17ac3e01e
      Call trace:
       dx_release+0x70/0x90
       ext4_htree_fill_tree+0x2d4/0x300
       ext4_readdir+0x244/0x6f8
       iterate_dir+0xbc/0x160
       SyS_getdents64+0x94/0x174
      Signed-off-by: default avatarSahitya Tummala <stummala@codeaurora.org>
      Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
      Reviewed-by: default avatarAndreas Dilger <adilger@dilger.ca>
      Cc: stable@kernel.org
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      fc0d59b2
    • Lukas Czerner's avatar
      ext4: fix data corruption caused by overlapping unaligned and aligned IO · 0dc4c612
      Lukas Czerner authored
      commit 57a0da28 upstream.
      
      Unaligned AIO must be serialized because the zeroing of partial blocks
      of unaligned AIO can result in data corruption in case it's overlapping
      another in flight IO.
      
      Currently we wait for all unwritten extents before we submit unaligned
      AIO which protects data in case of unaligned AIO is following overlapping
      IO. However if a unaligned AIO is followed by overlapping aligned AIO we
      can still end up corrupting data.
      
      To fix this, we must make sure that the unaligned AIO is the only IO in
      flight by waiting for unwritten extents conversion not just before the
      IO submission, but right after it as well.
      
      This problem can be reproduced by xfstest generic/538
      Signed-off-by: default avatarLukas Czerner <lczerner@redhat.com>
      Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
      Cc: stable@kernel.org
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      0dc4c612
    • Sriram Rajagopalan's avatar
      ext4: zero out the unused memory region in the extent tree block · b02ae56d
      Sriram Rajagopalan authored
      commit 592acbf1 upstream.
      
      This commit zeroes out the unused memory region in the buffer_head
      corresponding to the extent metablock after writing the extent header
      and the corresponding extent node entries.
      
      This is done to prevent random uninitialized data from getting into
      the filesystem when the extent block is synced.
      
      This fixes CVE-2019-11833.
      Signed-off-by: default avatarSriram Rajagopalan <sriramr@arista.com>
      Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
      Cc: stable@kernel.org
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      b02ae56d
    • Anup Patel's avatar
      tty: Don't force RISCV SBI console as preferred console · 9e897e34
      Anup Patel authored
      commit f91253a3 upstream.
      
      The Linux kernel will auto-disables all boot consoles whenever it
      gets a preferred real console.
      
      Currently on RISC-V systems, if we have a real console which is not
      RISCV SBI console then boot consoles (such as earlycon=sbi) are not
      auto-disabled when a real console (ttyS0 or ttySIF0) is available.
      This results in duplicate prints at boot-time after kernel starts
      using real console (i.e. ttyS0 or ttySIF0) if "earlycon=" kernel
      parameter was passed by bootloader.
      
      The reason for above issue is that RISCV SBI console always adds
      itself as preferred console which is causing other real consoles
      to be not used as preferred console.
      
      Ideally "console=" kernel parameter passed by bootloaders should
      be the one selecting a preferred real console.
      
      This patch fixes above issue by not forcing RISCV SBI console as
      preferred console.
      
      Fixes: afa6b1cc ("tty: New RISC-V SBI console driver")
      Cc: stable@vger.kernel.org
      Signed-off-by: default avatarAnup Patel <anup.patel@wdc.com>
      Reviewed-by: default avatarAtish Patra <atish.patra@wdc.com>
      Signed-off-by: default avatarPalmer Dabbelt <palmer@sifive.com>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      9e897e34
    • Jiufei Xue's avatar
      fs/writeback.c: use rcu_barrier() to wait for inflight wb switches going into workqueue when umount · 0b9d5347
      Jiufei Xue authored
      commit ec084de9 upstream.
      
      synchronize_rcu() didn't wait for call_rcu() callbacks, so inode wb
      switch may not go to the workqueue after synchronize_rcu().  Thus
      previous scheduled switches was not finished even flushing the
      workqueue, which will cause a NULL pointer dereferenced followed below.
      
        VFS: Busy inodes after unmount of vdd. Self-destruct in 5 seconds.  Have a nice day...
        BUG: unable to handle kernel NULL pointer dereference at 0000000000000278
          evict+0xb3/0x180
          iput+0x1b0/0x230
          inode_switch_wbs_work_fn+0x3c0/0x6a0
          worker_thread+0x4e/0x490
          ? process_one_work+0x410/0x410
          kthread+0xe6/0x100
          ret_from_fork+0x39/0x50
      
      Replace the synchronize_rcu() call with a rcu_barrier() to wait for all
      pending callbacks to finish.  And inc isw_nr_in_flight after call_rcu()
      in inode_switch_wbs() to make more sense.
      
      Link: http://lkml.kernel.org/r/20190429024108.54150-1-jiufei.xue@linux.alibaba.comSigned-off-by: default avatarJiufei Xue <jiufei.xue@linux.alibaba.com>
      Acked-by: default avatarTejun Heo <tj@kernel.org>
      Suggested-by: default avatarTejun Heo <tj@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>
      0b9d5347
    • Mel Gorman's avatar
      mm/compaction.c: correct zone boundary handling when isolating pages from a pageblock · 0e294894
      Mel Gorman authored
      commit 60fce36a upstream.
      
      syzbot reported the following error from a tree with a head commit of
      baf76f0c ("slip: make slhc_free() silently accept an error pointer")
      
        BUG: unable to handle kernel paging request at ffffea0003348000
        #PF error: [normal kernel read fault]
        PGD 12c3f9067 P4D 12c3f9067 PUD 12c3f8067 PMD 0
        Oops: 0000 [#1] PREEMPT SMP KASAN
        CPU: 1 PID: 28916 Comm: syz-executor.2 Not tainted 5.1.0-rc6+ #89
        Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
        RIP: 0010:constant_test_bit arch/x86/include/asm/bitops.h:314 [inline]
        RIP: 0010:PageCompound include/linux/page-flags.h:186 [inline]
        RIP: 0010:isolate_freepages_block+0x1c0/0xd40 mm/compaction.c:579
        Code: 01 d8 ff 4d 85 ed 0f 84 ef 07 00 00 e8 29 00 d8 ff 4c 89 e0 83 85 38 ff
        ff ff 01 48 c1 e8 03 42 80 3c 38 00 0f 85 31 0a 00 00 <4d> 8b 2c 24 31 ff 49
        c1 ed 10 41 83 e5 01 44 89 ee e8 3a 01 d8 ff
        RSP: 0018:ffff88802b31eab8 EFLAGS: 00010246
        RAX: 1ffffd4000669000 RBX: 00000000000cd200 RCX: ffffc9000a235000
        RDX: 000000000001ca5e RSI: ffffffff81988cc7 RDI: 0000000000000001
        RBP: ffff88802b31ebd8 R08: ffff88805af700c0 R09: 0000000000000000
        R10: 0000000000000000 R11: 0000000000000000 R12: ffffea0003348000
        R13: 0000000000000000 R14: ffff88802b31f030 R15: dffffc0000000000
        FS:  00007f61648dc700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
        CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
        CR2: ffffea0003348000 CR3: 0000000037c64000 CR4: 00000000001426e0
        Call Trace:
         fast_isolate_around mm/compaction.c:1243 [inline]
         fast_isolate_freepages mm/compaction.c:1418 [inline]
         isolate_freepages mm/compaction.c:1438 [inline]
         compaction_alloc+0x1aee/0x22e0 mm/compaction.c:1550
      
      There is no reproducer and it is difficult to hit -- 1 crash every few
      days.  The issue is very similar to the fix in commit 6b0868c8
      ("mm/compaction.c: correct zone boundary handling when resetting pageblock
      skip hints").  When isolating free pages around a target pageblock, the
      boundary handling is off by one and can stray into the next pageblock.
      Triggering the syzbot error requires that the end of pageblock is section
      or zone aligned, and that the next section is unpopulated.
      
      A more subtle consequence of the bug is that pageblocks were being
      improperly used as migration targets which potentially hurts fragmentation
      avoidance in the long-term one page at a time.
      
      A debugging patch revealed that it's definitely possible to stray outside
      of a pageblock which is not intended.  While syzbot cannot be used to
      verify this patch, it was confirmed that the debugging warning no longer
      triggers with this patch applied.  It has also been confirmed that the THP
      allocation stress tests are not degraded by this patch.
      
      Link: http://lkml.kernel.org/r/20190510182124.GI18914@techsingularity.net
      Fixes: e332f741 ("mm, compaction: be selective about what pageblocks to clear skip hints")
      Signed-off-by: default avatarMel Gorman <mgorman@techsingularity.net>
      Reported-by: syzbot+d84c80f9fe26a0f7a734@syzkaller.appspotmail.com
      Cc: Dmitry Vyukov <dvyukov@google.com>
      Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
      Cc: Qian Cai <cai@lca.pw>
      Cc: Michal Hocko <mhocko@suse.com>
      Cc: Vlastimil Babka <vbabka@suse.cz>
      Cc: <stable@vger.kernel.org> # v5.1+
      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>
      0e294894
    • Fabio Estevam's avatar
      ARM: dts: imx: Fix the AR803X phy-mode · b05c5e79
      Fabio Estevam authored
      commit 0672d22a upstream.
      
      Commit 6d4cd041 ("net: phy: at803x: disable delay only for RGMII mode")
      exposed an issue on imx DTS files using AR8031/AR8035 PHYs.
      
      The end result is that the boards can no longer obtain an IP address
      via UDHCP, for example.
      
      Quoting Andrew Lunn:
      
      "The problem here is, all the DTs were broken since day 0. However,
      because the PHY driver was also broken, nobody noticed and it
      worked. Now that the PHY driver has been fixed, all the bugs in the
      DTs now become an issue"
      
      To fix this problem, the phy-mode property needs to be "rgmii-id",  which
      has the following meaning as per
      Documentation/devicetree/bindings/net/ethernet.txt:
      
      "RGMII with internal RX and TX delays provided by the PHY, the MAC should
      not add the RX or TX delays in this case)"
      
      Tested on imx6-sabresd, imx6sx-sdb and imx7d-pico boards with
      successfully restored networking.
      
      Based on the initial submission from Steve Twiss for the
      imx6qdl-sabresd.
      Signed-off-by: default avatarFabio Estevam <festevam@gmail.com>
      Tested-by: default avatarBaruch Siach <baruch@tkos.co.il>
      Tested-by: default avatarSoeren Moch <smoch@web.de>
      Tested-by: default avatarSteve Twiss <stwiss.opensource@diasemi.com>
      Tested-by: default avatarAdam Thomson <Adam.Thomson@diasemi.com>
      Signed-off-by: default avatarSteve Twiss <stwiss.opensource@diasemi.com>
      Tested-by: default avatarMarc Kleine-Budde <mkl@pengutronix.de>
      Signed-off-by: default avatarMarc Kleine-Budde <mkl@pengutronix.de>
      Signed-off-by: default avatarShawn Guo <shawnguo@kernel.org>
      Cc: "George G. Davis" <george_davis@mentor.com>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      b05c5e79
    • Kamlakant Patel's avatar
      ipmi:ssif: compare block number correctly for multi-part return messages · 14c7aae7
      Kamlakant Patel authored
      commit 55be8658 upstream.
      
      According to ipmi spec, block number is a number that is incremented,
      starting with 0, for each new block of message data returned using the
      middle transaction.
      
      Here, the 'blocknum' is data[0] which always starts from zero(0) and
      'ssif_info->multi_pos' starts from 1.
      So, we need to add +1 to blocknum while comparing with multi_pos.
      
      Fixes: 7d6380cd ("ipmi:ssif: Fix handling of multi-part return messages").
      Reported-by: default avatarKiran Kolukuluru <kirank@ami.com>
      Signed-off-by: default avatarKamlakant Patel <kamlakantp@marvell.com>
      Message-Id: <1556106615-18722-1-git-send-email-kamlakantp@marvell.com>
      [Also added a debug log if the block numbers don't match.]
      Signed-off-by: default avatarCorey Minyard <cminyard@mvista.com>
      Cc: stable@vger.kernel.org # 4.4
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      14c7aae7
    • Corey Minyard's avatar
      ipmi: Add the i2c-addr property for SSIF interfaces · ebad3ccb
      Corey Minyard authored
      commit d7323638 upstream.
      
      This is required for SSIF to work.
      
      There was no way to know if the interface being added was SI
      or SSIF from the platform data, but that was required so the
      i2c-addr is only added for SSIF interfaces.  So add a field
      for that.
      
      Also rework the logic a bit so that ipmi-type is not set
      for SSIF interfaces, as it is not necessary for that.
      
      Fixes: 3cd83bac ("ipmi: Consolidate the adding of platform devices")
      Reported-by: default avatarKamlakant Patel <kamlakantp@marvell.com>
      Signed-off-by: default avatarCorey Minyard <cminyard@mvista.com>
      Cc: stable@vger.kernel.org # 5.1
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      ebad3ccb
    • Coly Li's avatar
      bcache: never set KEY_PTRS of journal key to 0 in journal_reclaim() · 9c52c4cf
      Coly Li authored
      commit 1bee2add upstream.
      
      In journal_reclaim() ja->cur_idx of each cache will be update to
      reclaim available journal buckets. Variable 'int n' is used to count how
      many cache is successfully reclaimed, then n is set to c->journal.key
      by SET_KEY_PTRS(). Later in journal_write_unlocked(), a for_each_cache()
      loop will write the jset data onto each cache.
      
      The problem is, if all jouranl buckets on each cache is full, the
      following code in journal_reclaim(),
      
      529 for_each_cache(ca, c, iter) {
      530       struct journal_device *ja = &ca->journal;
      531       unsigned int next = (ja->cur_idx + 1) % ca->sb.njournal_buckets;
      532
      533       /* No space available on this device */
      534       if (next == ja->discard_idx)
      535               continue;
      536
      537       ja->cur_idx = next;
      538       k->ptr[n++] = MAKE_PTR(0,
      539                         bucket_to_sector(c, ca->sb.d[ja->cur_idx]),
      540                         ca->sb.nr_this_dev);
      541 }
      542
      543 bkey_init(k);
      544 SET_KEY_PTRS(k, n);
      
      If there is no available bucket to reclaim, the if() condition at line
      534 will always true, and n remains 0. Then at line 544, SET_KEY_PTRS()
      will set KEY_PTRS field of c->journal.key to 0.
      
      Setting KEY_PTRS field of c->journal.key to 0 is wrong. Because in
      journal_write_unlocked() the journal data is written in following loop,
      
      649	for (i = 0; i < KEY_PTRS(k); i++) {
      650-671		submit journal data to cache device
      672	}
      
      If KEY_PTRS field is set to 0 in jouranl_reclaim(), the journal data
      won't be written to cache device here. If system crahed or rebooted
      before bkeys of the lost journal entries written into btree nodes, data
      corruption will be reported during bcache reload after rebooting the
      system.
      
      Indeed there is only one cache in a cache set, there is no need to set
      KEY_PTRS field in journal_reclaim() at all. But in order to keep the
      for_each_cache() logic consistent for now, this patch fixes the above
      problem by not setting 0 KEY_PTRS of journal key, if there is no bucket
      available to reclaim.
      Signed-off-by: default avatarColy Li <colyli@suse.de>
      Reviewed-by: default avatarHannes Reinecke <hare@suse.com>
      Cc: stable@vger.kernel.org
      Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      9c52c4cf
    • Liang Chen's avatar
      bcache: fix a race between cache register and cacheset unregister · 41f891ee
      Liang Chen authored
      commit a4b732a2 upstream.
      
      There is a race between cache device register and cache set unregister.
      For an already registered cache device, register_bcache will call
      bch_is_open to iterate through all cachesets and check every cache
      there. The race occurs if cache_set_free executes at the same time and
      clears the caches right before ca is dereferenced in bch_is_open_cache.
      To close the race, let's make sure the clean up work is protected by
      the bch_register_lock as well.
      
      This issue can be reproduced as follows,
      while true; do echo /dev/XXX> /sys/fs/bcache/register ; done&
      while true; do echo 1> /sys/block/XXX/bcache/set/unregister ; done &
      
      and results in the following oops,
      
      [  +0.000053] BUG: unable to handle kernel NULL pointer dereference at 0000000000000998
      [  +0.000457] #PF error: [normal kernel read fault]
      [  +0.000464] PGD 800000003ca9d067 P4D 800000003ca9d067 PUD 3ca9c067 PMD 0
      [  +0.000388] Oops: 0000 [#1] SMP PTI
      [  +0.000269] CPU: 1 PID: 3266 Comm: bash Not tainted 5.0.0+ #6
      [  +0.000346] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.0-2.fc28 04/01/2014
      [  +0.000472] RIP: 0010:register_bcache+0x1829/0x1990 [bcache]
      [  +0.000344] Code: b0 48 83 e8 50 48 81 fa e0 e1 10 c0 0f 84 a9 00 00 00 48 89 c6 48 89 ca 0f b7 ba 54 04 00 00 4c 8b 82 60 0c 00 00 85 ff 74 2f <49> 3b a8 98 09 00 00 74 4e 44 8d 47 ff 31 ff 49 c1 e0 03 eb 0d
      [  +0.000839] RSP: 0018:ffff92ee804cbd88 EFLAGS: 00010202
      [  +0.000328] RAX: ffffffffc010e190 RBX: ffff918b5c6b5000 RCX: ffff918b7d8e0000
      [  +0.000399] RDX: ffff918b7d8e0000 RSI: ffffffffc010e190 RDI: 0000000000000001
      [  +0.000398] RBP: ffff918b7d318340 R08: 0000000000000000 R09: ffffffffb9bd2d7a
      [  +0.000385] R10: ffff918b7eb253c0 R11: ffffb95980f51200 R12: ffffffffc010e1a0
      [  +0.000411] R13: fffffffffffffff2 R14: 000000000000000b R15: ffff918b7e232620
      [  +0.000384] FS:  00007f955bec2740(0000) GS:ffff918b7eb00000(0000) knlGS:0000000000000000
      [  +0.000420] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  +0.000801] CR2: 0000000000000998 CR3: 000000003cad6000 CR4: 00000000001406e0
      [  +0.000837] Call Trace:
      [  +0.000682]  ? _cond_resched+0x10/0x20
      [  +0.000691]  ? __kmalloc+0x131/0x1b0
      [  +0.000710]  kernfs_fop_write+0xfa/0x170
      [  +0.000733]  __vfs_write+0x2e/0x190
      [  +0.000688]  ? inode_security+0x10/0x30
      [  +0.000698]  ? selinux_file_permission+0xd2/0x120
      [  +0.000752]  ? security_file_permission+0x2b/0x100
      [  +0.000753]  vfs_write+0xa8/0x1a0
      [  +0.000676]  ksys_write+0x4d/0xb0
      [  +0.000699]  do_syscall_64+0x3a/0xf0
      [  +0.000692]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
      Signed-off-by: default avatarLiang Chen <liangchen.linux@gmail.com>
      Cc: stable@vger.kernel.org
      Signed-off-by: default avatarColy Li <colyli@suse.de>
      Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      41f891ee
    • Filipe Manana's avatar
      Btrfs: fix race between send and deduplication that lead to failures and crashes · 5a3d1d4d
      Filipe Manana authored
      commit 62d54f3a upstream.
      
      Send operates on read only trees and expects them to never change while it
      is using them. This is part of its initial design, and this expection is
      due to two different reasons:
      
      1) When it was introduced, no operations were allowed to modifiy read-only
         subvolumes/snapshots (including defrag for example).
      
      2) It keeps send from having an impact on other filesystem operations.
         Namely send does not need to keep locks on the trees nor needs to hold on
         to transaction handles and delay transaction commits. This ends up being
         a consequence of the former reason.
      
      However the deduplication feature was introduced later (on September 2013,
      while send was introduced in July 2012) and it allowed for deduplication
      with destination files that belong to read-only trees (subvolumes and
      snapshots).
      
      That means that having a send operation (either full or incremental) running
      in parallel with a deduplication that has the destination inode in one of
      the trees used by the send operation, can result in tree nodes and leaves
      getting freed and reused while send is using them. This problem is similar
      to the problem solved for the root nodes getting freed and reused when a
      snapshot is made against one tree that is currenly being used by a send
      operation, fixed in commits [1] and [2]. These commits explain in detail
      how the problem happens and the explanation is valid for any node or leaf
      that is not the root of a tree as well. This problem was also discussed
      and explained recently in a thread [3].
      
      The problem is very easy to reproduce when using send with large trees
      (snapshots) and just a few concurrent deduplication operations that target
      files in the trees used by send. A stress test case is being sent for
      fstests that triggers the issue easily. The most common error to hit is
      the send ioctl return -EIO with the following messages in dmesg/syslog:
      
       [1631617.204075] BTRFS error (device sdc): did not find backref in send_root. inode=63292, offset=0, disk_byte=5228134400 found extent=5228134400
       [1631633.251754] BTRFS error (device sdc): parent transid verify failed on 32243712 wanted 24 found 27
      
      The first one is very easy to hit while the second one happens much less
      frequently, except for very large trees (in that test case, snapshots
      with 100000 files having large xattrs to get deep and wide trees).
      Less frequently, at least one BUG_ON can be hit:
      
       [1631742.130080] ------------[ cut here ]------------
       [1631742.130625] kernel BUG at fs/btrfs/ctree.c:1806!
       [1631742.131188] invalid opcode: 0000 [#6] SMP DEBUG_PAGEALLOC PTI
       [1631742.131726] CPU: 1 PID: 13394 Comm: btrfs Tainted: G    B D W         5.0.0-rc8-btrfs-next-45 #1
       [1631742.132265] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.11.2-0-gf9626ccb91-prebuilt.qemu-project.org 04/01/2014
       [1631742.133399] RIP: 0010:read_node_slot+0x122/0x130 [btrfs]
       (...)
       [1631742.135061] RSP: 0018:ffffb530021ebaa0 EFLAGS: 00010246
       [1631742.135615] RAX: ffff93ac8912e000 RBX: 000000000000009d RCX: 0000000000000002
       [1631742.136173] RDX: 000000000000009d RSI: ffff93ac564b0d08 RDI: ffff93ad5b48c000
       [1631742.136759] RBP: ffffb530021ebb7d R08: 0000000000000001 R09: ffffb530021ebb7d
       [1631742.137324] R10: ffffb530021eba70 R11: 0000000000000000 R12: ffff93ac87d0a708
       [1631742.137900] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001
       [1631742.138455] FS:  00007f4cdb1528c0(0000) GS:ffff93ad76a80000(0000) knlGS:0000000000000000
       [1631742.139010] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
       [1631742.139568] CR2: 00007f5acb3d0420 CR3: 000000012be3e006 CR4: 00000000003606e0
       [1631742.140131] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
       [1631742.140719] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
       [1631742.141272] Call Trace:
       [1631742.141826]  ? do_raw_spin_unlock+0x49/0xc0
       [1631742.142390]  tree_advance+0x173/0x1d0 [btrfs]
       [1631742.142948]  btrfs_compare_trees+0x268/0x690 [btrfs]
       [1631742.143533]  ? process_extent+0x1070/0x1070 [btrfs]
       [1631742.144088]  btrfs_ioctl_send+0x1037/0x1270 [btrfs]
       [1631742.144645]  _btrfs_ioctl_send+0x80/0x110 [btrfs]
       [1631742.145161]  ? trace_sched_stick_numa+0xe0/0xe0
       [1631742.145685]  btrfs_ioctl+0x13fe/0x3120 [btrfs]
       [1631742.146179]  ? account_entity_enqueue+0xd3/0x100
       [1631742.146662]  ? reweight_entity+0x154/0x1a0
       [1631742.147135]  ? update_curr+0x20/0x2a0
       [1631742.147593]  ? check_preempt_wakeup+0x103/0x250
       [1631742.148053]  ? do_vfs_ioctl+0xa2/0x6f0
       [1631742.148510]  ? btrfs_ioctl_get_supported_features+0x30/0x30 [btrfs]
       [1631742.148942]  do_vfs_ioctl+0xa2/0x6f0
       [1631742.149361]  ? __fget+0x113/0x200
       [1631742.149767]  ksys_ioctl+0x70/0x80
       [1631742.150159]  __x64_sys_ioctl+0x16/0x20
       [1631742.150543]  do_syscall_64+0x60/0x1b0
       [1631742.150931]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
       [1631742.151326] RIP: 0033:0x7f4cd9f5add7
       (...)
       [1631742.152509] RSP: 002b:00007ffe91017708 EFLAGS: 00000202 ORIG_RAX: 0000000000000010
       [1631742.152892] RAX: ffffffffffffffda RBX: 0000000000000105 RCX: 00007f4cd9f5add7
       [1631742.153268] RDX: 00007ffe91017790 RSI: 0000000040489426 RDI: 0000000000000007
       [1631742.153633] RBP: 0000000000000007 R08: 00007f4cd9e79700 R09: 00007f4cd9e79700
       [1631742.153999] R10: 00007f4cd9e799d0 R11: 0000000000000202 R12: 0000000000000003
       [1631742.154365] R13: 0000555dfae53020 R14: 0000000000000000 R15: 0000000000000001
       (...)
       [1631742.156696] ---[ end trace 5dac9f96dcc3fd6b ]---
      
      That BUG_ON happens because while send is using a node, that node is COWed
      by a concurrent deduplication, gets freed and gets reused as a leaf (because
      a transaction commit happened in between), so when it attempts to read a
      slot from the extent buffer, at ctree.c:read_node_slot(), the extent buffer
      contents were wiped out and it now matches a leaf (which can even belong to
      some other tree now), hitting the BUG_ON(level == 0).
      
      Fix this concurrency issue by not allowing send and deduplication to run
      in parallel if both operate on the same readonly trees, returning EAGAIN
      to user space and logging an exlicit warning in dmesg/syslog.
      
      [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=be6821f82c3cc36e026f5afd10249988852b35ea
      [2] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6f2f0b394b54e2b159ef969a0b5274e9bbf82ff2
      [3] https://lore.kernel.org/linux-btrfs/CAL3q7H7iqSEEyFaEtpRZw3cp613y+4k2Q8b4W7mweR3tZA05bQ@mail.gmail.com/
      
      CC: stable@vger.kernel.org # 4.4+
      Signed-off-by: default avatarFilipe Manana <fdmanana@suse.com>
      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>
      5a3d1d4d
    • Filipe Manana's avatar
      Btrfs: do not start a transaction at iterate_extent_inodes() · e0791fa4
      Filipe Manana authored
      commit bfc61c36 upstream.
      
      When finding out which inodes have references on a particular extent, done
      by backref.c:iterate_extent_inodes(), from the BTRFS_IOC_LOGICAL_INO (both
      v1 and v2) ioctl and from scrub we use the transaction join API to grab a
      reference on the currently running transaction, since in order to give
      accurate results we need to inspect the delayed references of the currently
      running transaction.
      
      However, if there is currently no running transaction, the join operation
      will create a new transaction. This is inefficient as the transaction will
      eventually be committed, doing unnecessary IO and introducing a potential
      point of failure that will lead to a transaction abort due to -ENOSPC, as
      recently reported [1].
      
      That's because the join, creates the transaction but does not reserve any
      space, so when attempting to update the root item of the root passed to
      btrfs_join_transaction(), during the transaction commit, we can end up
      failling with -ENOSPC. Users of a join operation are supposed to actually
      do some filesystem changes and reserve space by some means, which is not
      the case of iterate_extent_inodes(), it is a read-only operation for all
      contextes from which it is called.
      
      The reported [1] -ENOSPC failure stack trace is the following:
      
       heisenberg kernel: ------------[ cut here ]------------
       heisenberg kernel: BTRFS: Transaction aborted (error -28)
       heisenberg kernel: WARNING: CPU: 0 PID: 7137 at fs/btrfs/root-tree.c:136 btrfs_update_root+0x22b/0x320 [btrfs]
      (...)
       heisenberg kernel: CPU: 0 PID: 7137 Comm: btrfs-transacti Not tainted 4.19.0-4-amd64 #1 Debian 4.19.28-2
       heisenberg kernel: Hardware name: FUJITSU LIFEBOOK U757/FJNB2A5, BIOS Version 1.21 03/19/2018
       heisenberg kernel: RIP: 0010:btrfs_update_root+0x22b/0x320 [btrfs]
      (...)
       heisenberg kernel: RSP: 0018:ffffb5448828bd40 EFLAGS: 00010286
       heisenberg kernel: RAX: 0000000000000000 RBX: ffff8ed56bccef50 RCX: 0000000000000006
       heisenberg kernel: RDX: 0000000000000007 RSI: 0000000000000092 RDI: ffff8ed6bda166a0
       heisenberg kernel: RBP: 00000000ffffffe4 R08: 00000000000003df R09: 0000000000000007
       heisenberg kernel: R10: 0000000000000000 R11: 0000000000000001 R12: ffff8ed63396a078
       heisenberg kernel: R13: ffff8ed092d7c800 R14: ffff8ed64f5db028 R15: ffff8ed6bd03d068
       heisenberg kernel: FS:  0000000000000000(0000) GS:ffff8ed6bda00000(0000) knlGS:0000000000000000
       heisenberg kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
       heisenberg kernel: CR2: 00007f46f75f8000 CR3: 0000000310a0a002 CR4: 00000000003606f0
       heisenberg kernel: DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
       heisenberg kernel: DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
       heisenberg kernel: Call Trace:
       heisenberg kernel:  commit_fs_roots+0x166/0x1d0 [btrfs]
       heisenberg kernel:  ? _cond_resched+0x15/0x30
       heisenberg kernel:  ? btrfs_run_delayed_refs+0xac/0x180 [btrfs]
       heisenberg kernel:  btrfs_commit_transaction+0x2bd/0x870 [btrfs]
       heisenberg kernel:  ? start_transaction+0x9d/0x3f0 [btrfs]
       heisenberg kernel:  transaction_kthread+0x147/0x180 [btrfs]
       heisenberg kernel:  ? btrfs_cleanup_transaction+0x530/0x530 [btrfs]
       heisenberg kernel:  kthread+0x112/0x130
       heisenberg kernel:  ? kthread_bind+0x30/0x30
       heisenberg kernel:  ret_from_fork+0x35/0x40
       heisenberg kernel: ---[ end trace 05de912e30e012d9 ]---
      
      So fix that by using the attach API, which does not create a transaction
      when there is currently no running transaction.
      
      [1] https://lore.kernel.org/linux-btrfs/b2a668d7124f1d3e410367f587926f622b3f03a4.camel@scientia.net/Reported-by: default avatarZygo Blaxell <ce3g8jdj@umail.furryterror.org>
      CC: stable@vger.kernel.org # 4.4+
      Signed-off-by: default avatarFilipe Manana <fdmanana@suse.com>
      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>
      e0791fa4
    • Filipe Manana's avatar
      Btrfs: do not start a transaction during fiemap · c0f9698f
      Filipe Manana authored
      commit 03628cdb upstream.
      
      During fiemap, for regular extents (non inline) we need to check if they
      are shared and if they are, set the shared bit. Checking if an extent is
      shared requires checking the delayed references of the currently running
      transaction, since some reference might have not yet hit the extent tree
      and be only in the in-memory delayed references.
      
      However we were using a transaction join for this, which creates a new
      transaction when there is no transaction currently running. That means
      that two more potential failures can happen: creating the transaction and
      committing it. Further, if no write activity is currently happening in the
      system, and fiemap calls keep being done, we end up creating and
      committing transactions that do nothing.
      
      In some extreme cases this can result in the commit of the transaction
      created by fiemap to fail with ENOSPC when updating the root item of a
      subvolume tree because a join does not reserve any space, leading to a
      trace like the following:
      
       heisenberg kernel: ------------[ cut here ]------------
       heisenberg kernel: BTRFS: Transaction aborted (error -28)
       heisenberg kernel: WARNING: CPU: 0 PID: 7137 at fs/btrfs/root-tree.c:136 btrfs_update_root+0x22b/0x320 [btrfs]
      (...)
       heisenberg kernel: CPU: 0 PID: 7137 Comm: btrfs-transacti Not tainted 4.19.0-4-amd64 #1 Debian 4.19.28-2
       heisenberg kernel: Hardware name: FUJITSU LIFEBOOK U757/FJNB2A5, BIOS Version 1.21 03/19/2018
       heisenberg kernel: RIP: 0010:btrfs_update_root+0x22b/0x320 [btrfs]
      (...)
       heisenberg kernel: RSP: 0018:ffffb5448828bd40 EFLAGS: 00010286
       heisenberg kernel: RAX: 0000000000000000 RBX: ffff8ed56bccef50 RCX: 0000000000000006
       heisenberg kernel: RDX: 0000000000000007 RSI: 0000000000000092 RDI: ffff8ed6bda166a0
       heisenberg kernel: RBP: 00000000ffffffe4 R08: 00000000000003df R09: 0000000000000007
       heisenberg kernel: R10: 0000000000000000 R11: 0000000000000001 R12: ffff8ed63396a078
       heisenberg kernel: R13: ffff8ed092d7c800 R14: ffff8ed64f5db028 R15: ffff8ed6bd03d068
       heisenberg kernel: FS:  0000000000000000(0000) GS:ffff8ed6bda00000(0000) knlGS:0000000000000000
       heisenberg kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
       heisenberg kernel: CR2: 00007f46f75f8000 CR3: 0000000310a0a002 CR4: 00000000003606f0
       heisenberg kernel: DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
       heisenberg kernel: DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
       heisenberg kernel: Call Trace:
       heisenberg kernel:  commit_fs_roots+0x166/0x1d0 [btrfs]
       heisenberg kernel:  ? _cond_resched+0x15/0x30
       heisenberg kernel:  ? btrfs_run_delayed_refs+0xac/0x180 [btrfs]
       heisenberg kernel:  btrfs_commit_transaction+0x2bd/0x870 [btrfs]
       heisenberg kernel:  ? start_transaction+0x9d/0x3f0 [btrfs]
       heisenberg kernel:  transaction_kthread+0x147/0x180 [btrfs]
       heisenberg kernel:  ? btrfs_cleanup_transaction+0x530/0x530 [btrfs]
       heisenberg kernel:  kthread+0x112/0x130
       heisenberg kernel:  ? kthread_bind+0x30/0x30
       heisenberg kernel:  ret_from_fork+0x35/0x40
       heisenberg kernel: ---[ end trace 05de912e30e012d9 ]---
      
      Since fiemap (and btrfs_check_shared()) is a read-only operation, do not do
      a transaction join to avoid the overhead of creating a new transaction (if
      there is currently no running transaction) and introducing a potential
      point of failure when the new transaction gets committed, instead use a
      transaction attach to grab a handle for the currently running transaction
      if any.
      Reported-by: default avatarChristoph Anton Mitterer <calestyo@scientia.net>
      Link: https://lore.kernel.org/linux-btrfs/b2a668d7124f1d3e410367f587926f622b3f03a4.camel@scientia.net/
      Fixes: afce772e ("btrfs: fix check_shared for fiemap ioctl")
      CC: stable@vger.kernel.org # 4.14+
      Reviewed-by: default avatarQu Wenruo <wqu@suse.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>
      c0f9698f
    • Filipe Manana's avatar
      Btrfs: send, flush dellaloc in order to avoid data loss · 0bfc335f
      Filipe Manana authored
      commit 9f89d5de upstream.
      
      When we set a subvolume to read-only mode we do not flush dellaloc for any
      of its inodes (except if the filesystem is mounted with -o flushoncommit),
      since it does not affect correctness for any subsequent operations - except
      for a future send operation. The send operation will not be able to see the
      delalloc data since the respective file extent items, inode item updates,
      backreferences, etc, have not hit yet the subvolume and extent trees.
      
      Effectively this means data loss, since the send stream will not contain
      any data from existing delalloc. Another problem from this is that if the
      writeback starts and finishes while the send operation is in progress, we
      have the subvolume tree being being modified concurrently which can result
      in send failing unexpectedly with EIO or hitting runtime errors, assertion
      failures or hitting BUG_ONs, etc.
      
      Simple reproducer:
      
        $ mkfs.btrfs -f /dev/sdb
        $ mount /dev/sdb /mnt
      
        $ btrfs subvolume create /mnt/sv
        $ xfs_io -f -c "pwrite -S 0xea 0 108K" /mnt/sv/foo
      
        $ btrfs property set /mnt/sv ro true
        $ btrfs send -f /tmp/send.stream /mnt/sv
      
        $ od -t x1 -A d /mnt/sv/foo
        0000000 ea ea ea ea ea ea ea ea ea ea ea ea ea ea ea ea
        *
        0110592
      
        $ umount /mnt
        $ mkfs.btrfs -f /dev/sdc
        $ mount /dev/sdc /mnt
      
        $ btrfs receive -f /tmp/send.stream /mnt
        $ echo $?
        0
        $ od -t x1 -A d /mnt/sv/foo
        0000000
        # ---> empty file
      
      Since this a problem that affects send only, fix it in send by flushing
      dellaloc for all the roots used by the send operation before send starts
      to process the commit roots.
      
      This is a problem that affects send since it was introduced (commit
      31db9f7c ("Btrfs: introduce BTRFS_IOC_SEND for btrfs send/receive"))
      but backporting it to older kernels has some dependencies:
      
      - For kernels between 3.19 and 4.20, it depends on commit 3cd24c69
        ("btrfs: use tagged writepage to mitigate livelock of snapshot") because
        the function btrfs_start_delalloc_snapshot() does not exist before that
        commit. So one has to either pick that commit or replace the calls to
        btrfs_start_delalloc_snapshot() in this patch with calls to
        btrfs_start_delalloc_inodes().
      
      - For kernels older than 3.19 it also requires commit e5fa8f86
        ("Btrfs: ensure send always works on roots without orphans") because
        it depends on the function ensure_commit_roots_uptodate() which that
        commits introduced.
      
      - No dependencies for 5.0+ kernels.
      
      A test case for fstests follows soon.
      
      CC: stable@vger.kernel.org # 3.19+
      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>
      0bfc335f
    • Nikolay Borisov's avatar
      btrfs: Honour FITRIM range constraints during free space trim · eb432217
      Nikolay Borisov authored
      commit c2d1b3aa upstream.
      
      Up until now trimming the freespace was done irrespective of what the
      arguments of the FITRIM ioctl were. For example fstrim's -o/-l arguments
      will be entirely ignored. Fix it by correctly handling those paramter.
      This requires breaking if the found freespace extent is after the end of
      the passed range as well as completing trim after trimming
      fstrim_range::len bytes.
      
      Fixes: 499f377f ("btrfs: iterate over unused chunk space in FITRIM")
      CC: stable@vger.kernel.org # 4.4+
      Signed-off-by: default avatarNikolay Borisov <nborisov@suse.com>
      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>
      eb432217
    • Nikolay Borisov's avatar
      btrfs: Correctly free extent buffer in case btree_read_extent_buffer_pages fails · 6806833b
      Nikolay Borisov authored
      commit 537f38f0 upstream.
      
      If a an eb fails to be read for whatever reason - it's corrupted on disk
      and parent transid/key validations fail or IO for eb pages fail then
      this buffer must be removed from the buffer cache. Currently the code
      calls free_extent_buffer if an error occurs. Unfortunately this doesn't
      achieve the desired behavior since btrfs_find_create_tree_block returns
      with eb->refs == 2.
      
      On the other hand free_extent_buffer will only decrement the refs once
      leaving it added to the buffer cache radix tree.  This enables later
      code to look up the buffer from the cache and utilize it potentially
      leading to a crash.
      
      The correct way to free the buffer is call free_extent_buffer_stale.
      This function will correctly call atomic_dec explicitly for the buffer
      and subsequently call release_extent_buffer which will decrement the
      final reference thus correctly remove the invalid buffer from buffer
      cache. This change affects only newly allocated buffers since they have
      eb->refs == 2.
      
      Link: https://bugzilla.kernel.org/show_bug.cgi?id=202755Reported-by: default avatarJungyeon <jungyeon@gatech.edu>
      CC: stable@vger.kernel.org # 4.4+
      Signed-off-by: default avatarNikolay Borisov <nborisov@suse.com>
      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>
      6806833b
    • Qu Wenruo's avatar
      btrfs: Check the first key and level for cached extent buffer · d26d9ba5
      Qu Wenruo authored
      commit 448de471 upstream.
      
      [BUG]
      When reading a file from a fuzzed image, kernel can panic like:
      
        BTRFS warning (device loop0): csum failed root 5 ino 270 off 0 csum 0x98f94189 expected csum 0x00000000 mirror 1
        assertion failed: !memcmp_extent_buffer(b, &disk_key, offsetof(struct btrfs_leaf, items[0].key), sizeof(disk_key)), file: fs/btrfs/ctree.c, line: 2544
        ------------[ cut here ]------------
        kernel BUG at fs/btrfs/ctree.h:3500!
        invalid opcode: 0000 [#1] PREEMPT SMP NOPTI
        RIP: 0010:btrfs_search_slot.cold.24+0x61/0x63 [btrfs]
        Call Trace:
         btrfs_lookup_csum+0x52/0x150 [btrfs]
         __btrfs_lookup_bio_sums+0x209/0x640 [btrfs]
         btrfs_submit_bio_hook+0x103/0x170 [btrfs]
         submit_one_bio+0x59/0x80 [btrfs]
         extent_read_full_page+0x58/0x80 [btrfs]
         generic_file_read_iter+0x2f6/0x9d0
         __vfs_read+0x14d/0x1a0
         vfs_read+0x8d/0x140
         ksys_read+0x52/0xc0
         do_syscall_64+0x60/0x210
         entry_SYSCALL_64_after_hwframe+0x49/0xbe
      
      [CAUSE]
      The fuzzed image has a corrupted leaf whose first key doesn't match its
      parent:
      
        checksum tree key (CSUM_TREE ROOT_ITEM 0)
        node 29741056 level 1 items 14 free 107 generation 19 owner CSUM_TREE
        fs uuid 3381d111-94a3-4ac7-8f39-611bbbdab7e6
        chunk uuid 9af1c3c7-2af5-488b-8553-530bd515f14c
        	...
                key (EXTENT_CSUM EXTENT_CSUM 79691776) block 29761536 gen 19
      
        leaf 29761536 items 1 free space 1726 generation 19 owner CSUM_TREE
        leaf 29761536 flags 0x1(WRITTEN) backref revision 1
        fs uuid 3381d111-94a3-4ac7-8f39-611bbbdab7e6
        chunk uuid 9af1c3c7-2af5-488b-8553-530bd515f14c
                item 0 key (EXTENT_CSUM EXTENT_CSUM 8798638964736) itemoff 1751 itemsize 2244
                        range start 8798638964736 end 8798641262592 length 2297856
      
      When reading the above tree block, we have extent_buffer->refs = 2 in
      the context:
      
      - initial one from __alloc_extent_buffer()
        alloc_extent_buffer()
        |- __alloc_extent_buffer()
           |- atomic_set(&eb->refs, 1)
      
      - one being added to fs_info->buffer_radix
        alloc_extent_buffer()
        |- check_buffer_tree_ref()
           |- atomic_inc(&eb->refs)
      
      So if even we call free_extent_buffer() in read_tree_block or other
      similar situation, we only decrease the refs by 1, it doesn't reach 0
      and won't be freed right now.
      
      The staled eb and its corrupted content will still be kept cached.
      
      Furthermore, we have several extra cases where we either don't do first
      key check or the check is not proper for all callers:
      
      - scrub
        We just don't have first key in this context.
      
      - shared tree block
        One tree block can be shared by several snapshot/subvolume trees.
        In that case, the first key check for one subvolume doesn't apply to
        another.
      
      So for the above reasons, a corrupted extent buffer can sneak into the
      buffer cache.
      
      [FIX]
      Call verify_level_key in read_block_for_search to do another
      verification. For that purpose the function is exported.
      
      Due to above reasons, although we can free corrupted extent buffer from
      cache, we still need the check in read_block_for_search(), for scrub and
      shared tree blocks.
      
      Link: https://bugzilla.kernel.org/show_bug.cgi?id=202755
      Link: https://bugzilla.kernel.org/show_bug.cgi?id=202757
      Link: https://bugzilla.kernel.org/show_bug.cgi?id=202759
      Link: https://bugzilla.kernel.org/show_bug.cgi?id=202761
      Link: https://bugzilla.kernel.org/show_bug.cgi?id=202767
      Link: https://bugzilla.kernel.org/show_bug.cgi?id=202769Reported-by: default avatarYoon Jungyeon <jungyeon@gatech.edu>
      CC: stable@vger.kernel.org # 4.19+
      Signed-off-by: default avatarQu Wenruo <wqu@suse.com>
      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>
      d26d9ba5
    • Debabrata Banerjee's avatar
      ext4: fix ext4_show_options for file systems w/o journal · 3f28fcc3
      Debabrata Banerjee authored
      commit 50b29d8f upstream.
      
      Instead of removing EXT4_MOUNT_JOURNAL_CHECKSUM from s_def_mount_opt as
      I assume was intended, all other options were blown away leading to
      _ext4_show_options() output being incorrect.
      
      Fixes: 1e381f60 ("ext4: do not allow journal_opts for fs w/o journal")
      Signed-off-by: default avatarDebabrata Banerjee <dbanerje@akamai.com>
      Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
      Reviewed-by: default avatarJan Kara <jack@suse.cz>
      Cc: stable@kernel.org
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      3f28fcc3
    • Kirill Tkhai's avatar
      ext4: actually request zeroing of inode table after grow · 01303c3d
      Kirill Tkhai authored
      commit 310a997f upstream.
      
      It is never possible, that number of block groups decreases,
      since only online grow is supported.
      
      But after a growing occured, we have to zero inode tables
      for just created new block groups.
      
      Fixes: 19c5246d ("ext4: add new online resize interface")
      Signed-off-by: default avatarKirill Tkhai <ktkhai@virtuozzo.com>
      Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
      Reviewed-by: default avatarJan Kara <jack@suse.cz>
      Cc: stable@kernel.org
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      01303c3d
    • Barret Rhoden's avatar
      ext4: fix use-after-free race with debug_want_extra_isize · 3a50e298
      Barret Rhoden authored
      commit 7bc04c5c upstream.
      
      When remounting with debug_want_extra_isize, we were not performing the
      same checks that we do during a normal mount.  That allowed us to set a
      value for s_want_extra_isize that reached outside the s_inode_size.
      
      Fixes: e2b911c5 ("ext4: clean up feature test macros with predicate functions")
      Reported-by: syzbot+f584efa0ac7213c226b7@syzkaller.appspotmail.com
      Reviewed-by: default avatarJan Kara <jack@suse.cz>
      Signed-off-by: default avatarBarret Rhoden <brho@google.com>
      Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
      Cc: stable@vger.kernel.org
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      3a50e298
    • Pan Bian's avatar
      ext4: avoid drop reference to iloc.bh twice · 8f2faa83
      Pan Bian authored
      commit 8c380ab4 upstream.
      
      The reference to iloc.bh has been dropped in ext4_mark_iloc_dirty.
      However, the reference is dropped again if error occurs during
      ext4_handle_dirty_metadata, which may result in use-after-free bugs.
      
      Fixes: fb265c9c("ext4: add ext4_sb_bread() to disambiguate ENOMEM cases")
      Signed-off-by: default avatarPan Bian <bianpan2016@163.com>
      Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
      Reviewed-by: default avatarJan Kara <jack@suse.cz>
      Cc: stable@kernel.org
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      8f2faa83
    • Theodore Ts'o's avatar
      ext4: ignore e_value_offs for xattrs with value-in-ea-inode · e9f94dc2
      Theodore Ts'o authored
      commit e5d01196 upstream.
      
      In other places in fs/ext4/xattr.c, if e_value_inum is non-zero, the
      code ignores the value in e_value_offs.  The e_value_offs *should* be
      zero, but we shouldn't depend upon it, since it might not be true in a
      corrupted/fuzzed file system.
      
      Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=202897
      Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=202877Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
      Cc: stable@kernel.org
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      e9f94dc2
    • Jan Kara's avatar
      ext4: make sanity check in mballoc more strict · c3d102ac
      Jan Kara authored
      commit 31562b95 upstream.
      
      The sanity check in mb_find_extent() only checked that returned extent
      does not extend past blocksize * 8, however it should not extend past
      EXT4_CLUSTERS_PER_GROUP(sb). This can happen when clusters_per_group <
      blocksize * 8 and the tail of the bitmap is not properly filled by 1s
      which happened e.g. when ancient kernels have grown the filesystem.
      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>
      c3d102ac
    • Jiufei Xue's avatar
      jbd2: check superblock mapped prior to committing · c2a50e04
      Jiufei Xue authored
      commit 742b06b5 upstream.
      
      We hit a BUG at fs/buffer.c:3057 if we detached the nbd device
      before unmounting ext4 filesystem.
      
      The typical chain of events leading to the BUG:
      jbd2_write_superblock
        submit_bh
          submit_bh_wbc
            BUG_ON(!buffer_mapped(bh));
      
      The block device is removed and all the pages are invalidated. JBD2
      was trying to write journal superblock to the block device which is
      no longer present.
      
      Fix this by checking the journal superblock's buffer head prior to
      submitting.
      Reported-by: default avatarEric Ren <renzhen@linux.alibaba.com>
      Signed-off-by: default avatarJiufei Xue <jiufei.xue@linux.alibaba.com>
      Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
      Reviewed-by: default avatarJan Kara <jack@suse.cz>
      Cc: stable@kernel.org
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      c2a50e04
    • Sergei Trofimovich's avatar
      tty/vt: fix write/write race in ioctl(KDSKBSENT) handler · ed1d236d
      Sergei Trofimovich authored
      commit 46ca3f73 upstream.
      
      The bug manifests as an attempt to access deallocated memory:
      
          BUG: unable to handle kernel paging request at ffff9c8735448000
          #PF error: [PROT] [WRITE]
          PGD 288a05067 P4D 288a05067 PUD 288a07067 PMD 7f60c2063 PTE 80000007f5448161
          Oops: 0003 [#1] PREEMPT SMP
          CPU: 6 PID: 388 Comm: loadkeys Tainted: G         C        5.0.0-rc6-00153-g5ded5871 #91
          Hardware name: Gigabyte Technology Co., Ltd. To be filled by O.E.M./H77M-D3H, BIOS F12 11/14/2013
          RIP: 0010:__memmove+0x81/0x1a0
          Code: 4c 89 4f 10 4c 89 47 18 48 8d 7f 20 73 d4 48 83 c2 20 e9 a2 00 00 00 66 90 48 89 d1 4c 8b 5c 16 f8 4c 8d 54 17 f8 48 c1 e9 03 <f3> 48 a5 4d 89 1a e9 0c 01 00 00 0f 1f 40 00 48 89 d1 4c 8b 1e 49
          RSP: 0018:ffffa1b9002d7d08 EFLAGS: 00010203
          RAX: ffff9c873541af43 RBX: ffff9c873541af43 RCX: 00000c6f105cd6bf
          RDX: 0000637882e986b6 RSI: ffff9c8735447ffb RDI: ffff9c8735447ffb
          RBP: ffff9c8739cd3800 R08: ffff9c873b802f00 R09: 00000000fffff73b
          R10: ffffffffb82b35f1 R11: 00505b1b004d5b1b R12: 0000000000000000
          R13: ffff9c873541af3d R14: 000000000000000b R15: 000000000000000c
          FS:  00007f450c390580(0000) GS:ffff9c873f180000(0000) knlGS:0000000000000000
          CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
          CR2: ffff9c8735448000 CR3: 00000007e213c002 CR4: 00000000000606e0
          Call Trace:
           vt_do_kdgkb_ioctl+0x34d/0x440
           vt_ioctl+0xba3/0x1190
           ? __bpf_prog_run32+0x39/0x60
           ? mem_cgroup_commit_charge+0x7b/0x4e0
           tty_ioctl+0x23f/0x920
           ? preempt_count_sub+0x98/0xe0
           ? __seccomp_filter+0x67/0x600
           do_vfs_ioctl+0xa2/0x6a0
           ? syscall_trace_enter+0x192/0x2d0
           ksys_ioctl+0x3a/0x70
           __x64_sys_ioctl+0x16/0x20
           do_syscall_64+0x54/0xe0
           entry_SYSCALL_64_after_hwframe+0x49/0xbe
      
      The bug manifests on systemd systems with multiple vtcon devices:
        # cat /sys/devices/virtual/vtconsole/vtcon0/name
        (S) dummy device
        # cat /sys/devices/virtual/vtconsole/vtcon1/name
        (M) frame buffer device
      
      There systemd runs 'loadkeys' tool in tapallel for each vtcon
      instance. This causes two parallel ioctl(KDSKBSENT) calls to
      race into adding the same entry into 'func_table' array at:
      
          drivers/tty/vt/keyboard.c:vt_do_kdgkb_ioctl()
      
      The function has no locking around writes to 'func_table'.
      
      The simplest reproducer is to have initrams with the following
      init on a 8-CPU machine x86_64:
      
          #!/bin/sh
      
          loadkeys -q windowkeys ru4 &
          loadkeys -q windowkeys ru4 &
          loadkeys -q windowkeys ru4 &
          loadkeys -q windowkeys ru4 &
      
          loadkeys -q windowkeys ru4 &
          loadkeys -q windowkeys ru4 &
          loadkeys -q windowkeys ru4 &
          loadkeys -q windowkeys ru4 &
          wait
      
      The change adds lock on write path only. Reads are still racy.
      
      CC: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
      CC: Jiri Slaby <jslaby@suse.com>
      Link: https://lkml.org/lkml/2019/2/17/256Signed-off-by: default avatarSergei Trofimovich <slyfox@gentoo.org>
      Cc: stable <stable@vger.kernel.org>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      ed1d236d
    • Yifeng Li's avatar
      tty: vt.c: Fix TIOCL_BLANKSCREEN console blanking if blankinterval == 0 · f5eaf86b
      Yifeng Li authored
      commit 75ddbc1f upstream.
      
      Previously, in the userspace, it was possible to use the "setterm" command
      from util-linux to blank the VT console by default, using the following
      command.
      
      According to the man page,
      
      > The force option keeps the screen blank even if a key is pressed.
      
      It was implemented by calling TIOCL_BLANKSCREEN.
      
      	case BLANKSCREEN:
      		ioctlarg = TIOCL_BLANKSCREEN;
      		if (ioctl(STDIN_FILENO, TIOCLINUX, &ioctlarg))
      			warn(_("cannot force blank"));
      		break;
      
      However, after Linux 4.12, this command ceased to work anymore, which is
      unexpected. By inspecting the kernel source, it shows that the issue was
      triggered by the side-effect from commit a4199f5e ("tty: Disable
      default console blanking interval").
      
      The console blanking is implemented by function do_blank_screen() in vt.c:
      "blank_state" will be initialized to "blank_normal_wait" in con_init() if
      AND ONLY IF ("blankinterval" > 0). If "blankinterval" is 0, "blank_state"
      will be "blank_off" (== 0), and a call to do_blank_screen() will always
      abort, even if a forced blanking is required from the user by calling
      TIOCL_BLANKSCREEN, the console won't be blanked.
      
      This behavior is unexpected from a user's point-of-view, since it's not
      mentioned in any documentation. The setterm man page suggests it will
      always work, and the kernel comments in uapi/linux/tiocl.h says
      
      > /* keep screen blank even if a key is pressed */
      > #define TIOCL_BLANKSCREEN 14
      
      To fix it, we simply remove the "blank_state != blank_off" check, as
      pointed out by Nicolas Pitre, this check doesn't logically make sense
      and it's safe to remove.
      Suggested-by: default avatarNicolas Pitre <nicolas.pitre@linaro.org>
      Fixes: a4199f5e ("tty: Disable default console blanking interval")
      Signed-off-by: default avatarYifeng Li <tomli@tomli.me>
      Cc: stable <stable@vger.kernel.org>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      f5eaf86b
    • Chris Packham's avatar
      mtd: maps: Allow MTD_PHYSMAP with MTD_RAM · df944974
      Chris Packham authored
      commit d4197009 upstream.
      
      When the physmap_of_core.c code was merged into physmap-core.c the
      ability to use MTD_PHYSMAP_OF with only MTD_RAM selected was lost.
      Restore this by adding MTD_RAM to the dependencies of MTD_PHYSMAP.
      
      Fixes: commit 642b1e8d ("mtd: maps: Merge physmap_of.c into physmap-core.c")
      Cc: <stable@vger.kernel.org>
      Signed-off-by: default avatarChris Packham <chris.packham@alliedtelesis.co.nz>
      Reviewed-by: default avatarHamish Martin <hamish.martin@alliedtelesis.co.nz>
      Signed-off-by: default avatarRichard Weinberger <richard@nod.at>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      df944974
    • Chris Packham's avatar
      mtd: maps: physmap: Store gpio_values correctly · 8b429d21
      Chris Packham authored
      commit 64d14c6f upstream.
      
      When the gpio-addr-flash.c driver was merged with physmap-core.c the
      code to store the current gpio_values was lost. This meant that once a
      gpio was asserted it was never de-asserted. Fix this by storing the
      current offset in gpio_values like the old driver used to.
      
      Fixes: commit ba32ce95 ("mtd: maps: Merge gpio-addr-flash.c into physmap-core.c")
      Cc: <stable@vger.kernel.org>
      Signed-off-by: default avatarChris Packham <chris.packham@alliedtelesis.co.nz>
      Reviewed-by: default avatarBoris Brezillon <boris.brezillon@collabora.com>
      Signed-off-by: default avatarRichard Weinberger <richard@nod.at>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      8b429d21
    • Alexander Sverdlin's avatar
      mtd: spi-nor: intel-spi: Avoid crossing 4K address boundary on read/write · 052fec61
      Alexander Sverdlin authored
      commit 2b75ebee upstream.
      
      It was observed that reads crossing 4K address boundary are failing.
      
      This limitation is mentioned in Intel documents:
      
      Intel(R) 9 Series Chipset Family Platform Controller Hub (PCH) Datasheet:
      
      "5.26.3 Flash Access
      Program Register Access:
      * Program Register Accesses are not allowed to cross a 4 KB boundary..."
      
      Enhanced Serial Peripheral Interface (eSPI)
      Interface Base Specification (for Client and Server Platforms):
      
      "5.1.4 Address
      For other memory transactions, the address may start or end at any byte
      boundary. However, the address and payload length combination must not
      cross the naturally aligned address boundary of the corresponding Maximum
      Payload Size. It must not cross a 4 KB address boundary."
      
      Avoid this by splitting an operation crossing the boundary into two
      operations.
      
      Fixes: 8afda8b2 ("spi-nor: Add support for Intel SPI serial flash controller")
      Cc: stable@vger.kernel.org
      Reported-by: default avatarRomain Porte <romain.porte@nokia.com>
      Tested-by: default avatarPascal Fabreges <pascal.fabreges@nokia.com>
      Signed-off-by: default avatarAlexander Sverdlin <alexander.sverdlin@nokia.com>
      Reviewed-by: default avatarTudor Ambarus <tudor.ambarus@microchip.com>
      Acked-by: default avatarMika Westerberg <mika.westerberg@linux.intel.com>
      Signed-off-by: default avatarMiquel Raynal <miquel.raynal@bootlin.com>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      052fec61
    • Dmitry Osipenko's avatar
      mfd: max77620: Fix swapped FPS_PERIOD_MAX_US values · e07fbc73
      Dmitry Osipenko authored
      commit ea611d1c upstream.
      
      The FPS_PERIOD_MAX_US definitions are swapped for MAX20024 and MAX77620,
      fix it.
      
      Cc: stable <stable@vger.kernel.org>
      Signed-off-by: default avatarDmitry Osipenko <digetx@gmail.com>
      Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      e07fbc73
    • Steve Twiss's avatar
      mfd: da9063: Fix OTP control register names to match datasheets for DA9063/63L · 61d9c6f8
      Steve Twiss authored
      commit 6b4814a9 upstream.
      
      Mismatch between what is found in the Datasheets for DA9063 and DA9063L
      provided by Dialog Semiconductor, and the register names provided in the
      MFD registers file. The changes are for the OTP (one-time-programming)
      control registers. The two naming errors are OPT instead of OTP, and
      COUNT instead of CONT (i.e. control).
      
      Cc: Stable <stable@vger.kernel.org>
      Signed-off-by: default avatarSteve Twiss <stwiss.opensource@diasemi.com>
      Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      61d9c6f8
    • Erik Schmauss's avatar
      ACPICA: Linux: move ACPI_DEBUG_DEFAULT flag out of ifndef · b9bfb671
      Erik Schmauss authored
      commit 11207b4d upstream.
      
      ACPICA commit c14f17fa0acf8c93497ce04b9a7f4ada51b69383
      
      This flag should not be included in #ifndef CONFIG_ACPI. It should be
      used unconditionally.
      
      Link: https://github.com/acpica/acpica/commit/c14f17fa
      Fixes: aa9aaa4d ("ACPI: use different default debug value than ACPICA")
      Reported-by: default avatarGabriel C <nix.or.die@gmail.com>
      Tested-by: default avatarGabriel C <nix.or.die@gmail.com>
      Signed-off-by: default avatarErik Schmauss <erik.schmauss@intel.com>
      Signed-off-by: default avatarBob Moore <robert.moore@intel.com>
      Cc: 5.1+ <stable@vger.kernel.org> 5.1+
      Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      b9bfb671
    • Rajat Jain's avatar
      ACPI: PM: Set enable_for_wake for wakeup GPEs during suspend-to-idle · 707edfd5
      Rajat Jain authored
      commit 2f844b61 upstream.
      
      I noticed that recently multiple systems (chromebooks) couldn't wake
      from S0ix using LID or Keyboard after updating to a newer kernel. I
      bisected and it turned up commit f941d3e4 ("ACPI: EC / PM: Disable
      non-wakeup GPEs for suspend-to-idle"). I checked that the issue got
      fixed if that commit was reverted.
      
      I debugged and found that although PNP0C0D:00 (representing the LID)
      is wake capable and should wakeup the system per the code in
      acpi_wakeup_gpe_init() and in drivers/acpi/button.c:
      
      localhost /sys # cat /proc/acpi/wakeup
      Device  S-state   Status   Sysfs node
      LID0      S4    *enabled   platform:PNP0C0D:00
      CREC      S5    *disabled  platform:GOOG0004:00
                      *disabled  platform:cros-ec-dev.1.auto
                      *disabled  platform:cros-ec-accel.0
                      *disabled  platform:cros-ec-accel.1
                      *disabled  platform:cros-ec-gyro.0
                      *disabled  platform:cros-ec-ring.0
                      *disabled  platform:cros-usbpd-charger.2.auto
                      *disabled  platform:cros-usbpd-logger.3.auto
      D015      S3    *enabled   i2c:i2c-ELAN0000:00
      PENH      S3    *enabled   platform:PRP0001:00
      XHCI      S3    *enabled   pci:0000:00:14.0
      GLAN      S4    *disabled
      WIFI      S3    *disabled  pci:0000:00:14.3
      localhost /sys #
      
      On debugging, I found that its corresponding GPE is not being enabled.
      The particular GPE's "gpe_register_info->enable_for_wake" does not
      have any bits set when acpi_enable_all_wakeup_gpes() comes around to
      use it. I looked at code and could not find any other code path that
      should set the bits in "enable_for_wake" bitmask for the wake enabled
      devices for s2idle.  [I do see that it happens for S3 in
      acpi_sleep_prepare()].
      
      Thus I used the same call to enable the GPEs for wake enabled devices,
      and verified that this fixes the regression I was seeing on multiple
      of my devices.
      
      [ rjw: The problem is that commit f941d3e4 ("ACPI: EC / PM:
        Disable non-wakeup GPEs for suspend-to-idle") forgot to add
        the acpi_enable_wakeup_devices() call for s2idle along with
        acpi_enable_all_wakeup_gpes(). ]
      
      Fixes: f941d3e4 ("ACPI: EC / PM: Disable non-wakeup GPEs for suspend-to-idle")
      Link: https://bugzilla.kernel.org/show_bug.cgi?id=203579Signed-off-by: default avatarRajat Jain <rajatja@google.com>
      [ rjw: Subject & changelog ]
      Cc: 5.0+ <stable@vger.kernel.org> # 5.0+
      Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      707edfd5
    • Andrea Arcangeli's avatar
      userfaultfd: use RCU to free the task struct when fork fails · aa9bb986
      Andrea Arcangeli authored
      commit c3f3ce04 upstream.
      
      The task structure is freed while get_mem_cgroup_from_mm() holds
      rcu_read_lock() and dereferences mm->owner.
      
        get_mem_cgroup_from_mm()                failing fork()
        ----                                    ---
        task = mm->owner
                                                mm->owner = NULL;
                                                free(task)
        if (task) *task; /* use after free */
      
      The fix consists in freeing the task with RCU also in the fork failure
      case, exactly like it always happens for the regular exit(2) path.  That
      is enough to make the rcu_read_lock hold in get_mem_cgroup_from_mm()
      (left side above) effective to avoid a use after free when dereferencing
      the task structure.
      
      An alternate possible fix would be to defer the delivery of the
      userfaultfd contexts to the monitor until after fork() is guaranteed to
      succeed.  Such a change would require more changes because it would
      create a strict ordering dependency where the uffd methods would need to
      be called beyond the last potentially failing branch in order to be
      safe.  This solution as opposed only adds the dependency to common code
      to set mm->owner to NULL and to free the task struct that was pointed by
      mm->owner with RCU, if fork ends up failing.  The userfaultfd methods
      can still be called anywhere during the fork runtime and the monitor
      will keep discarding orphaned "mm" coming from failed forks in userland.
      
      This race condition couldn't trigger if CONFIG_MEMCG was set =n at build
      time.
      
      [aarcange@redhat.com: improve changelog, reduce #ifdefs per Michal]
        Link: http://lkml.kernel.org/r/20190429035752.4508-1-aarcange@redhat.com
      Link: http://lkml.kernel.org/r/20190325225636.11635-2-aarcange@redhat.com
      Fixes: 893e26e6 ("userfaultfd: non-cooperative: Add fork() event")
      Signed-off-by: default avatarAndrea Arcangeli <aarcange@redhat.com>
      Tested-by: default avatarzhong jiang <zhongjiang@huawei.com>
      Reported-by: syzbot+cbb52e396df3e565ab02@syzkaller.appspotmail.com
      Cc: Oleg Nesterov <oleg@redhat.com>
      Cc: Jann Horn <jannh@google.com>
      Cc: Hugh Dickins <hughd@google.com>
      Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
      Cc: Mike Kravetz <mike.kravetz@oracle.com>
      Cc: Peter Xu <peterx@redhat.com>
      Cc: Jason Gunthorpe <jgg@mellanox.com>
      Cc: "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>
      Cc: Michal Hocko <mhocko@suse.com>
      Cc: zhong jiang <zhongjiang@huawei.com>
      Cc: syzbot+cbb52e396df3e565ab02@syzkaller.appspotmail.com
      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>
      aa9bb986
    • Shuning Zhang's avatar
      ocfs2: fix ocfs2 read inode data panic in ocfs2_iget · a8ff70cb
      Shuning Zhang authored
      commit e091eab0 upstream.
      
      In some cases, ocfs2_iget() reads the data of inode, which has been
      deleted for some reason.  That will make the system panic.  So We should
      judge whether this inode has been deleted, and tell the caller that the
      inode is a bad inode.
      
      For example, the ocfs2 is used as the backed of nfs, and the client is
      nfsv3.  This issue can be reproduced by the following steps.
      
      on the nfs server side,
      ..../patha/pathb
      
      Step 1: The process A was scheduled before calling the function fh_verify.
      
      Step 2: The process B is removing the 'pathb', and just completed the call
      to function dput.  Then the dentry of 'pathb' has been deleted from the
      dcache, and all ancestors have been deleted also.  The relationship of
      dentry and inode was deleted through the function hlist_del_init.  The
      following is the call stack.
      dentry_iput->hlist_del_init(&dentry->d_u.d_alias)
      
      At this time, the inode is still in the dcache.
      
      Step 3: The process A call the function ocfs2_get_dentry, which get the
      inode from dcache.  Then the refcount of inode is 1.  The following is the
      call stack.
      nfsd3_proc_getacl->fh_verify->exportfs_decode_fh->fh_to_dentry(ocfs2_get_dentry)
      
      Step 4: Dirty pages are flushed by bdi threads.  So the inode of 'patha'
      is evicted, and this directory was deleted.  But the inode of 'pathb'
      can't be evicted, because the refcount of the inode was 1.
      
      Step 5: The process A keep running, and call the function
      reconnect_path(in exportfs_decode_fh), which call function
      ocfs2_get_parent of ocfs2.  Get the block number of parent
      directory(patha) by the name of ...  Then read the data from disk by the
      block number.  But this inode has been deleted, so the system panic.
      
      Process A                                             Process B
      1. in nfsd3_proc_getacl                   |
      2.                                        |        dput
      3. fh_to_dentry(ocfs2_get_dentry)         |
      4. bdi flush dirty cache                  |
      5. ocfs2_iget                             |
      
      [283465.542049] OCFS2: ERROR (device sdp): ocfs2_validate_inode_block:
      Invalid dinode #580640: OCFS2_VALID_FL not set
      
      [283465.545490] Kernel panic - not syncing: OCFS2: (device sdp): panic forced
      after error
      
      [283465.546889] CPU: 5 PID: 12416 Comm: nfsd Tainted: G        W
      4.1.12-124.18.6.el6uek.bug28762940v3.x86_64 #2
      [283465.548382] Hardware name: VMware, Inc. VMware Virtual Platform/440BX
      Desktop Reference Platform, BIOS 6.00 09/21/2015
      [283465.549657]  0000000000000000 ffff8800a56fb7b8 ffffffff816e839c
      ffffffffa0514758
      [283465.550392]  000000000008dc20 ffff8800a56fb838 ffffffff816e62d3
      0000000000000008
      [283465.551056]  ffff880000000010 ffff8800a56fb848 ffff8800a56fb7e8
      ffff88005df9f000
      [283465.551710] Call Trace:
      [283465.552516]  [<ffffffff816e839c>] dump_stack+0x63/0x81
      [283465.553291]  [<ffffffff816e62d3>] panic+0xcb/0x21b
      [283465.554037]  [<ffffffffa04e66b0>] ocfs2_handle_error+0xf0/0xf0 [ocfs2]
      [283465.554882]  [<ffffffffa04e7737>] __ocfs2_error+0x67/0x70 [ocfs2]
      [283465.555768]  [<ffffffffa049c0f9>] ocfs2_validate_inode_block+0x229/0x230
      [ocfs2]
      [283465.556683]  [<ffffffffa047bcbc>] ocfs2_read_blocks+0x46c/0x7b0 [ocfs2]
      [283465.557408]  [<ffffffffa049bed0>] ? ocfs2_inode_cache_io_unlock+0x20/0x20
      [ocfs2]
      [283465.557973]  [<ffffffffa049f0eb>] ocfs2_read_inode_block_full+0x3b/0x60
      [ocfs2]
      [283465.558525]  [<ffffffffa049f5ba>] ocfs2_iget+0x4aa/0x880 [ocfs2]
      [283465.559082]  [<ffffffffa049146e>] ocfs2_get_parent+0x9e/0x220 [ocfs2]
      [283465.559622]  [<ffffffff81297c05>] reconnect_path+0xb5/0x300
      [283465.560156]  [<ffffffff81297f46>] exportfs_decode_fh+0xf6/0x2b0
      [283465.560708]  [<ffffffffa062faf0>] ? nfsd_proc_getattr+0xa0/0xa0 [nfsd]
      [283465.561262]  [<ffffffff810a8196>] ? prepare_creds+0x26/0x110
      [283465.561932]  [<ffffffffa0630860>] fh_verify+0x350/0x660 [nfsd]
      [283465.562862]  [<ffffffffa0637804>] ? nfsd_cache_lookup+0x44/0x630 [nfsd]
      [283465.563697]  [<ffffffffa063a8b9>] nfsd3_proc_getattr+0x69/0xf0 [nfsd]
      [283465.564510]  [<ffffffffa062cf60>] nfsd_dispatch+0xe0/0x290 [nfsd]
      [283465.565358]  [<ffffffffa05eb892>] ? svc_tcp_adjust_wspace+0x12/0x30
      [sunrpc]
      [283465.566272]  [<ffffffffa05ea652>] svc_process_common+0x412/0x6a0 [sunrpc]
      [283465.567155]  [<ffffffffa05eaa03>] svc_process+0x123/0x210 [sunrpc]
      [283465.568020]  [<ffffffffa062c90f>] nfsd+0xff/0x170 [nfsd]
      [283465.568962]  [<ffffffffa062c810>] ? nfsd_destroy+0x80/0x80 [nfsd]
      [283465.570112]  [<ffffffff810a622b>] kthread+0xcb/0xf0
      [283465.571099]  [<ffffffff810a6160>] ? kthread_create_on_node+0x180/0x180
      [283465.572114]  [<ffffffff816f11b8>] ret_from_fork+0x58/0x90
      [283465.573156]  [<ffffffff810a6160>] ? kthread_create_on_node+0x180/0x180
      
      Link: http://lkml.kernel.org/r/1554185919-3010-1-git-send-email-sunny.s.zhang@oracle.comSigned-off-by: default avatarShuning Zhang <sunny.s.zhang@oracle.com>
      Reviewed-by: default avatarJoseph Qi <jiangqi903@gmail.com>
      Cc: Mark Fasheh <mark@fasheh.com>
      Cc: Joel Becker <jlbec@evilplan.org>
      Cc: Junxiao Bi <junxiao.bi@oracle.com>
      Cc: Changwei Ge <gechangwei@live.cn>
      Cc: piaojun <piaojun@huawei.com>
      Cc: "Gang He" <ghe@suse.com>
      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>
      a8ff70cb
    • Mike Kravetz's avatar
      hugetlb: use same fault hash key for shared and private mappings · d7d995a8
      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>
      d7d995a8