vfs: fix deadlock in file_remove_privs() on overlayfs #20

vcaputo · 2016-08-03T19:19:56Z

file_remove_privs() is called with inode lock on file_inode(), which
proceeds to calling notify_change() on file->f_path.dentry. Which triggers
the WARN_ON_ONCE(!inode_is_locked(inode)) in addition to deadlocking later
when ovl_setattr tries to lock the underlying inode again.

Fix this mess by not mixing the layers, but doing everything on underlying
dentry/inode.

Signed-off-by: Miklos Szeredi [email protected]
Fixes: 07a2daa ("ovl: Copy up underlying inode's ->i_mode to overlay inode")
Cc: [email protected]

file_remove_privs() is called with inode lock on file_inode(), which proceeds to calling notify_change() on file->f_path.dentry. Which triggers the WARN_ON_ONCE(!inode_is_locked(inode)) in addition to deadlocking later when ovl_setattr tries to lock the underlying inode again. Fix this mess by not mixing the layers, but doing everything on underlying dentry/inode. Signed-off-by: Miklos Szeredi <[email protected]> Fixes: 07a2daa ("ovl: Copy up underlying inode's ->i_mode to overlay inode") Cc: <[email protected]>

vcaputo · 2016-08-03T19:22:51Z

Relevant discussion: https://marc.info/?l=linux-unionfs&m=147024189621106&w=3

mischief · 2016-08-03T20:00:15Z

lgtm

commit b6bc1c7 upstream. Function ib_create_qp() was failing to return an error when rdma_rw_init_mrs() fails, causing a crash further down in ib_create_qp() when trying to dereferece the qp pointer which was actually a negative errno. The crash: crash> log|grep BUG [ 136.458121] BUG: unable to handle kernel NULL pointer dereference at 0000000000000098 crash> bt PID: 3736 TASK: ffff8808543215c0 CPU: 2 COMMAND: "kworker/u64:2" #0 [ffff88084d323340] machine_kexec at ffffffff8105fbb0 #1 [ffff88084d3233b0] __crash_kexec at ffffffff81116758 #2 [ffff88084d323480] crash_kexec at ffffffff8111682d #3 [ffff88084d3234b0] oops_end at ffffffff81032bd6 #4 [ffff88084d3234e0] no_context at ffffffff8106e431 #5 [ffff88084d323530] __bad_area_nosemaphore at ffffffff8106e610 #6 [ffff88084d323590] bad_area_nosemaphore at ffffffff8106e6f4 #7 [ffff88084d3235a0] __do_page_fault at ffffffff8106ebdc #8 [ffff88084d323620] do_page_fault at ffffffff8106f057 #9 [ffff88084d323660] page_fault at ffffffff816e3148 [exception RIP: ib_create_qp+427] RIP: ffffffffa02554fb RSP: ffff88084d323718 RFLAGS: 00010246 RAX: 0000000000000004 RBX: fffffffffffffff4 RCX: 000000018020001f RDX: ffff880830997fc0 RSI: 0000000000000001 RDI: ffff88085f407200 RBP: ffff88084d323778 R8: 0000000000000001 R9: ffffea0020bae210 R10: ffffea0020bae218 R11: 0000000000000001 R12: ffff88084d3237c8 R13: 00000000fffffff4 R14: ffff880859fa5000 R15: ffff88082eb89800 ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018 #10 [ffff88084d323780] rdma_create_qp at ffffffffa0782681 [rdma_cm] #11 [ffff88084d3237b0] nvmet_rdma_create_queue_ib at ffffffffa07c43f3 [nvmet_rdma] #12 [ffff88084d323860] nvmet_rdma_alloc_queue at ffffffffa07c5ba9 [nvmet_rdma] #13 [ffff88084d323900] nvmet_rdma_queue_connect at ffffffffa07c5c96 [nvmet_rdma] #14 [ffff88084d323980] nvmet_rdma_cm_handler at ffffffffa07c6450 [nvmet_rdma] #15 [ffff88084d3239b0] iw_conn_req_handler at ffffffffa0787480 [rdma_cm] #16 [ffff88084d323a60] cm_conn_req_handler at ffffffffa0775f06 [iw_cm] #17 [ffff88084d323ab0] process_event at ffffffffa0776019 [iw_cm] #18 [ffff88084d323af0] cm_work_handler at ffffffffa0776170 [iw_cm] #19 [ffff88084d323cb0] process_one_work at ffffffff810a1483 #20 [ffff88084d323d90] worker_thread at ffffffff810a211d #21 [ffff88084d323ec0] kthread at ffffffff810a6c5c #22 [ffff88084d323f50] ret_from_fork at ffffffff816e1ebf Fixes: 632bc3f ("IB/core, RDMA RW API: Do not exceed QP SGE send limit") Signed-off-by: Steve Wise <[email protected]> Reviewed-by: Bart Van Assche <[email protected]> Signed-off-by: Doug Ledford <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>

commit 776b2e1 upstream. X722 hardware requires using the admin queue to configure RSS. This function was previously re-written in commit e69ff81 ("i40e: rework the functions to configure RSS with similar parameters"). However, the previous refactor did not work correctly for a few reasons (a) it does not check whether seed is NULL before using it, resulting in a NULL pointer dereference [ 402.954721] BUG: unable to handle kernel NULL pointer dereference at (null) [ 402.955568] IP: [<ffffffffa0090ccf>] i40e_config_rss_aq.constprop.65+0x2f/0x1c0 [i40e] [ 402.956402] PGD ad610067 PUD accc0067 PMD 0 [ 402.957235] Oops: 0000 [#1] SMP [ 402.958064] Modules linked in: ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 xt_conntrack ip_set nfnetlink ebtable_filter ebtable_ broute bridge stp llc ebtable_nat ebtables ip6table_mangle ip6table_raw ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv 6 ip6table_security ip6table_filter ip6_tables iptable_mangle iptable_raw iptable_nat nf_conntrack_ipv4_ nf_defrag_ipv4_ nf_nat_ip v4_ nf_nat nf_conntrack iptable_security intel_rapl i86_kg_temp_thermal coretemp kvm_intel kvm irqbypass crct10dif_clMl crc32_ pclMl ghash_clMlni_intel iTCO_wdt iTCO_vendor_support shpchp sb_edac dcdbas pcspkr joydev ipmi_devintf wmi edac_core ipmi_ssif acpi_ad acpi_ower_meter ipmi_si ipmi_msghandler mei_me nfsd lpc_ich mei ioatdma tpm_tis auth_rpcgss tpm nfs_acl lockd grace s unrpc ifs nngag200 i2c_algo_bit drm_kms_helper ttm drm iigbe bnx2x i40e dca mdio ptp pps_core libcrc32c fjes crc32c_intel [ 402.965563] CPU: 22 PID: 2461 Conm: ethtool Not tainted 4.6.0-rc7_1.2-ABNidQ+ #20 [ 402.966719] Hardware name: Dell Inc. PowerEdge R720/0C4Y3R, BIOS 2.5.2 01/28/2015 [ 402.967862] task: ffff880219b51dc0 ti: ffff8800b3408000 task.ti: ffff8800b3408000 [ 402.969046] RIP: 0010:[<ffffffffa0090ccf>] [<ffffffffa0090ccf>] i40e_config_rss_aq.constprop.65+0x2f/0x1c0 [i40e] [ 402.970339] RSP: 0018:ffff8800b340ba90 EFLAGS: 00010246 [ 402.971616] RAX: 0000000000000000 RBX: ffff88042ec14000 RCX: 0000000000000200 [ 402.972961] RDX: ffff880428eb9200 RSI: 0000000000000000 RDI: ffff88042ec14000 [ 402.974312] RBP: ffff8800b340baf8 R08: ffff880237ada8f0 R09: ffff880428eb9200 [ 402.975709] R10: ffff880428eb9200 R11: 0000000000000000 R12: ffff88042ec2e000 [ 402.977104] R13: ffff88042ec2e000 R14: ffff88042ec14000 R15: ffff88022ea00800 [ 402.978541] FS: 00007f84fd054700(0000) GS:ffff880237ac0000(0000) knlGS:0000000000000000 [ 402.980003] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 402.981508] CR2: 0000000000000000 CR3: 000000003289e000 CR4: 00000000000406e0 [ 402.983028] Stack: [ 402.984578] 0000000002000200 0000000000000000 ffff88023ffeda68 ffff88023ffef000 [ 402.986187] 0000000000000268 ffff8800b340bbf8 ffff88023ffedd80 0000000088ce4f1d [ 402.987844] ffff88042ec14000 ffff88022ea00800 ffff88042ec2e000 ffff88042ec14000 [ 402.989509] Call Trace: [ 402.991200] [<ffffffffa009636f>] i40e_config_rss+0x11f/0x1c0 [i40e] [ 402.992924] [<ffffffffa00a1ae0>] i40e_set_rifh+0ic0/0x130 [i40e] [ 402.994684] [<ffffffff816d54b7>] ethtool_set_rifh+0x1f7/0x300 [ 402.996446] [<ffffffff8136d02b>] ? cred_has_capability+0io6b/0x100 [ 402.998203] [<ffffffff8136d102>] ? selinux_capable+0x12/0x20 [ 402.999968] [<ffffffff8136277b>] ? security_capable+0x4b/0x70 [ 403.001707] [<ffffffff816d6da3>] dev_ethtool+0x1423/0x2290 [ 403.003461] [<ffffffff816eab41>] dev_ioctl+0x191/0io630 [ 403.005186] [<ffffffff811cf80a>] ? lru_cache_add+0x3a/0i80 [ 403.006942] [<ffffffff817f2a8e>] ? _raw_spin_unlock+0ie/0x20 [ 403.008691] [<ffffffff816adb95>] sock_do_ioctl+0x45/0i50 [ 403.010421] [<ffffffff816ae229>] sock_ioctl+0x209/0x2d0 [ 403.012173] [<ffffffff81262194>] do_vfs_ioctl+0u4/0io6c0 [ 403.013911] [<ffffffff81262829>] SyS_ioctl+0x79/0x90 [ 403.015710] [<ffffffff817f2e72>] entry_SYSCALL_64_fastpath+0x1a/0u4 [ 403.017500] Code: 90 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 89 fb 48 83 ec 40 4c 8b a7 e0 05 00 00 65 48 8b 04 25 28 00 00 00 48 89 45 d0 31 c0 <48> 8b 06 41 0f b7 bc 24 f2 0f 00 00 48 89 45 9c 48 8b 46 08 48 [ 403.021454] RIP [<ffffffffa0090ccf>] i40e_config_rss_aq.constprop.65+0x2f/0x1c0 [i40e] [ 403.023395] RSP <ffff8800b340ba90> [ 403.025271] CR2: 0000000000000000 [ 403.027169] ---[ end trace 64561b528cf61cf0 ]--- (b) it does not even bother to use the passed in *lut parameter which defines the requested lookup table. Instead it uses its own round robin table. Fix these issues by re-writing it to be similar to i40e_config_rss_reg and i40e_get_rss_aq. Fixes: e69ff81 ("i40e: rework the functions to configure RSS with similar parameters", 2015-10-21) Signed-off-by: Jacob Keller <[email protected]> Tested-by: Andrew Bowers <[email protected]> Signed-off-by: Jeff Kirsher <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>

commit 4dfce57 upstream. There have been several reports over the years of NULL pointer dereferences in xfs_trans_log_inode during xfs_fsr processes, when the process is doing an fput and tearing down extents on the temporary inode, something like: BUG: unable to handle kernel NULL pointer dereference at 0000000000000018 PID: 29439 TASK: ffff880550584fa0 CPU: 6 COMMAND: "xfs_fsr" [exception RIP: xfs_trans_log_inode+0x10] #9 [ffff8800a57bbbe0] xfs_bunmapi at ffffffffa037398e [xfs] #10 [ffff8800a57bbce8] xfs_itruncate_extents at ffffffffa0391b29 [xfs] #11 [ffff8800a57bbd88] xfs_inactive_truncate at ffffffffa0391d0c [xfs] #12 [ffff8800a57bbdb8] xfs_inactive at ffffffffa0392508 [xfs] #13 [ffff8800a57bbdd8] xfs_fs_evict_inode at ffffffffa035907e [xfs] #14 [ffff8800a57bbe00] evict at ffffffff811e1b67 #15 [ffff8800a57bbe28] iput at ffffffff811e23a5 #16 [ffff8800a57bbe58] dentry_kill at ffffffff811dcfc8 #17 [ffff8800a57bbe88] dput at ffffffff811dd06c #18 [ffff8800a57bbea8] __fput at ffffffff811c823b #19 [ffff8800a57bbef0] ____fput at ffffffff811c846e #20 [ffff8800a57bbf00] task_work_run at ffffffff81093b27 #21 [ffff8800a57bbf30] do_notify_resume at ffffffff81013b0c #22 [ffff8800a57bbf50] int_signal at ffffffff8161405d As it turns out, this is because the i_itemp pointer, along with the d_ops pointer, has been overwritten with zeros when we tear down the extents during truncate. When the in-core inode fork on the temporary inode used by xfs_fsr was originally set up during the extent swap, we mistakenly looked at di_nextents to determine whether all extents fit inline, but this misses extents generated by speculative preallocation; we should be using if_bytes instead. This mistake corrupts the in-memory inode, and code in xfs_iext_remove_inline eventually gets bad inputs, causing it to memmove and memset incorrect ranges; this became apparent because the two values in ifp->if_u2.if_inline_ext[1] contained what should have been in d_ops and i_itemp; they were memmoved due to incorrect array indexing and then the original locations were zeroed with memset, again due to an array overrun. Fix this by properly using i_df.if_bytes to determine the number of extents, not di_nextents. Thanks to dchinner for looking at this with me and spotting the root cause. Signed-off-by: Eric Sandeen <[email protected]> Reviewed-by: Brian Foster <[email protected]> Signed-off-by: Dave Chinner <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>

[ Upstream commit 45caeaa ] As Eric Dumazet pointed out this also needs to be fixed in IPv6. v2: Contains the IPv6 tcp/Ipv6 dccp patches as well. We have seen a few incidents lately where a dst_enty has been freed with a dangling TCP socket reference (sk->sk_dst_cache) pointing to that dst_entry. If the conditions/timings are right a crash then ensues when the freed dst_entry is referenced later on. A Common crashing back trace is: #8 [] page_fault at ffffffff8163e648 [exception RIP: __tcp_ack_snd_check+74] . . #9 [] tcp_rcv_established at ffffffff81580b64 #10 [] tcp_v4_do_rcv at ffffffff8158b54a #11 [] tcp_v4_rcv at ffffffff8158cd02 #12 [] ip_local_deliver_finish at ffffffff815668f4 #13 [] ip_local_deliver at ffffffff81566bd9 #14 [] ip_rcv_finish at ffffffff8156656d #15 [] ip_rcv at ffffffff81566f06 #16 [] __netif_receive_skb_core at ffffffff8152b3a2 #17 [] __netif_receive_skb at ffffffff8152b608 #18 [] netif_receive_skb at ffffffff8152b690 #19 [] vmxnet3_rq_rx_complete at ffffffffa015eeaf [vmxnet3] #20 [] vmxnet3_poll_rx_only at ffffffffa015f32a [vmxnet3] #21 [] net_rx_action at ffffffff8152bac2 #22 [] __do_softirq at ffffffff81084b4f #23 [] call_softirq at ffffffff8164845c #24 [] do_softirq at ffffffff81016fc5 #25 [] irq_exit at ffffffff81084ee5 #26 [] do_IRQ at ffffffff81648ff8 Of course it may happen with other NIC drivers as well. It's found the freed dst_entry here: 224 static bool tcp_in_quickack_mode(struct sock *sk)↩ 225 {↩ 226 ▹ const struct inet_connection_sock *icsk = inet_csk(sk);↩ 227 ▹ const struct dst_entry *dst = __sk_dst_get(sk);↩ 228 ↩ 229 ▹ return (dst && dst_metric(dst, RTAX_QUICKACK)) ||↩ 230 ▹ ▹ (icsk->icsk_ack.quick && !icsk->icsk_ack.pingpong);↩ 231 }↩ But there are other backtraces attributed to the same freed dst_entry in netfilter code as well. All the vmcores showed 2 significant clues: - Remote hosts behind the default gateway had always been redirected to a different gateway. A rtable/dst_entry will be added for that host. Making more dst_entrys with lower reference counts. Making this more probable. - All vmcores showed a postitive LockDroppedIcmps value, e.g: LockDroppedIcmps 267 A closer look at the tcp_v4_err() handler revealed that do_redirect() will run regardless of whether user space has the socket locked. This can result in a race condition where the same dst_entry cached in sk->sk_dst_entry can be decremented twice for the same socket via: do_redirect()->__sk_dst_check()-> dst_release(). Which leads to the dst_entry being prematurely freed with another socket pointing to it via sk->sk_dst_cache and a subsequent crash. To fix this skip do_redirect() if usespace has the socket locked. Instead let the redirect take place later when user space does not have the socket locked. The dccp/IPv6 code is very similar in this respect, so fixing it there too. As Eric Garver pointed out the following commit now invalidates routes. Which can set the dst->obsolete flag so that ipv4_dst_check() returns null and triggers the dst_release(). Fixes: ceb3320 ("ipv4: Kill routes during PMTU/redirect updates.") Cc: Eric Garver <[email protected]> Cc: Hannes Sowa <[email protected]> Signed-off-by: Jon Maxwell <[email protected]> Signed-off-by: David S. Miller <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>

commit 6f48655 upstream. This patch fixes a generate_node_acls = 1 + cache_dynamic_acls = 0 regression, that was introduced by commit 01d4d67 Author: Nicholas Bellinger <[email protected]> Date: Wed Dec 7 12:55:54 2016 -0800 which originally had the proper list_del_init() usage, but was dropped during list review as it was thought unnecessary by HCH. However, list_del_init() usage is required during the special generate_node_acls = 1 + cache_dynamic_acls = 0 case when transport_free_session() does a list_del(&se_nacl->acl_list), followed by target_complete_nacl() doing the same thing. This was manifesting as a general protection fault as reported by Justin: kernel: general protection fault: 0000 [#1] SMP kernel: Modules linked in: kernel: CPU: 0 PID: 11047 Comm: iscsi_ttx Not tainted 4.13.0-rc2.x86_64.1+ #20 kernel: Hardware name: Intel Corporation S5500BC/S5500BC, BIOS S5500.86B.01.00.0064.050520141428 05/05/2014 kernel: task: ffff88026939e800 task.stack: ffffc90007884000 kernel: RIP: 0010:target_put_nacl+0x49/0xb0 kernel: RSP: 0018:ffffc90007887d70 EFLAGS: 00010246 kernel: RAX: dead000000000200 RBX: ffff8802556ca000 RCX: 0000000000000000 kernel: RDX: dead000000000100 RSI: 0000000000000246 RDI: ffff8802556ce028 kernel: RBP: ffffc90007887d88 R08: 0000000000000001 R09: 0000000000000000 kernel: R10: ffffc90007887df8 R11: ffffea0009986900 R12: ffff8802556ce020 kernel: R13: ffff8802556ce028 R14: ffff8802556ce028 R15: ffffffff88d85540 kernel: FS: 0000000000000000(0000) GS:ffff88027fc00000(0000) knlGS:0000000000000000 kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 kernel: CR2: 00007fffe36f5f94 CR3: 0000000009209000 CR4: 00000000003406f0 kernel: DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 kernel: DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 kernel: Call Trace: kernel: transport_free_session+0x67/0x140 kernel: transport_deregister_session+0x7a/0xc0 kernel: iscsit_close_session+0x92/0x210 kernel: iscsit_close_connection+0x5f9/0x840 kernel: iscsit_take_action_for_connection_exit+0xfe/0x110 kernel: iscsi_target_tx_thread+0x140/0x1e0 kernel: ? wait_woken+0x90/0x90 kernel: kthread+0x124/0x160 kernel: ? iscsit_thread_get_cpumask+0x90/0x90 kernel: ? kthread_create_on_node+0x40/0x40 kernel: ret_from_fork+0x22/0x30 kernel: Code: 00 48 89 fb 4c 8b a7 48 01 00 00 74 68 4d 8d 6c 24 08 4c 89 ef e8 e8 28 43 00 48 8b 93 20 04 00 00 48 8b 83 28 04 00 00 4c 89 ef <48> 89 42 08 48 89 10 48 b8 00 01 00 00 00 00 ad de 48 89 83 20 kernel: RIP: target_put_nacl+0x49/0xb0 RSP: ffffc90007887d70 kernel: ---[ end trace f12821adbfd46fed ]--- To address this, go ahead and use proper list_del_list() for all cases of se_nacl->acl_list deletion. Reported-by: Justin Maggard <[email protected]> Tested-by: Justin Maggard <[email protected]> Cc: Justin Maggard <[email protected]> Signed-off-by: Nicholas Bellinger <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>

syzkaller reported a refcount_t warning [1] Issue here is that noop_qdisc refcnt was never really considered as a true refcount, since qdisc_destroy() found TCQ_F_BUILTIN set : if (qdisc->flags & TCQ_F_BUILTIN || !refcount_dec_and_test(&qdisc->refcnt))) return; Meaning that all atomic_inc() we did on noop_qdisc.refcnt were not really needed, but harmless until refcount_t came. To fix this problem, we simply need to not increment noop_qdisc.refcnt, since we never decrement it. [1] refcount_t: increment on 0; use-after-free. ------------[ cut here ]------------ WARNING: CPU: 0 PID: 21754 at lib/refcount.c:152 refcount_inc+0x47/0x50 lib/refcount.c:152 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 21754 Comm: syz-executor7 Not tainted 4.13.0-rc6+ #20 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:16 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:52 panic+0x1e4/0x417 kernel/panic.c:180 __warn+0x1c4/0x1d9 kernel/panic.c:541 report_bug+0x211/0x2d0 lib/bug.c:183 fixup_bug+0x40/0x90 arch/x86/kernel/traps.c:190 do_trap_no_signal arch/x86/kernel/traps.c:224 [inline] do_trap+0x260/0x390 arch/x86/kernel/traps.c:273 do_error_trap+0x120/0x390 arch/x86/kernel/traps.c:310 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:323 invalid_op+0x1e/0x30 arch/x86/entry/entry_64.S:846 RIP: 0010:refcount_inc+0x47/0x50 lib/refcount.c:152 RSP: 0018:ffff8801c43477a0 EFLAGS: 00010282 RAX: 000000000000002b RBX: ffffffff86093c14 RCX: 0000000000000000 RDX: 000000000000002b RSI: ffffffff8159314e RDI: ffffed0038868ee8 RBP: ffff8801c43477a8 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff86093ac0 R13: 0000000000000001 R14: ffff8801d0f3bac0 R15: dffffc0000000000 attach_default_qdiscs net/sched/sch_generic.c:792 [inline] dev_activate+0x7d3/0xaa0 net/sched/sch_generic.c:833 __dev_open+0x227/0x330 net/core/dev.c:1380 __dev_change_flags+0x695/0x990 net/core/dev.c:6726 dev_change_flags+0x88/0x140 net/core/dev.c:6792 dev_ifsioc+0x5a6/0x930 net/core/dev_ioctl.c:256 dev_ioctl+0x2bc/0xf90 net/core/dev_ioctl.c:554 sock_do_ioctl+0x94/0xb0 net/socket.c:968 sock_ioctl+0x2c2/0x440 net/socket.c:1058 vfs_ioctl fs/ioctl.c:45 [inline] do_vfs_ioctl+0x1b1/0x1520 fs/ioctl.c:685 SYSC_ioctl fs/ioctl.c:700 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:691 Fixes: 7b93640 ("net, sched: convert Qdisc.refcnt from atomic_t to refcount_t") Signed-off-by: Eric Dumazet <[email protected]> Reported-by: Dmitry Vyukov <[email protected]> Cc: Reshetova, Elena <[email protected]> Signed-off-by: David S. Miller <[email protected]>

This patch fixes a generate_node_acls = 1 + cache_dynamic_acls = 0 regression, that was introduced by commit 01d4d67 Author: Nicholas Bellinger <[email protected]> Date: Wed Dec 7 12:55:54 2016 -0800 which originally had the proper list_del_init() usage, but was dropped during list review as it was thought unnecessary by HCH. However, list_del_init() usage is required during the special generate_node_acls = 1 + cache_dynamic_acls = 0 case when transport_free_session() does a list_del(&se_nacl->acl_list), followed by target_complete_nacl() doing the same thing. This was manifesting as a general protection fault as reported by Justin: kernel: general protection fault: 0000 [coreos#1] SMP kernel: Modules linked in: kernel: CPU: 0 PID: 11047 Comm: iscsi_ttx Not tainted 4.13.0-rc2.x86_64.1+ coreos#20 kernel: Hardware name: Intel Corporation S5500BC/S5500BC, BIOS S5500.86B.01.00.0064.050520141428 05/05/2014 kernel: task: ffff88026939e800 task.stack: ffffc90007884000 kernel: RIP: 0010:target_put_nacl+0x49/0xb0 kernel: RSP: 0018:ffffc90007887d70 EFLAGS: 00010246 kernel: RAX: dead000000000200 RBX: ffff8802556ca000 RCX: 0000000000000000 kernel: RDX: dead000000000100 RSI: 0000000000000246 RDI: ffff8802556ce028 kernel: RBP: ffffc90007887d88 R08: 0000000000000001 R09: 0000000000000000 kernel: R10: ffffc90007887df8 R11: ffffea0009986900 R12: ffff8802556ce020 kernel: R13: ffff8802556ce028 R14: ffff8802556ce028 R15: ffffffff88d85540 kernel: FS: 0000000000000000(0000) GS:ffff88027fc00000(0000) knlGS:0000000000000000 kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 kernel: CR2: 00007fffe36f5f94 CR3: 0000000009209000 CR4: 00000000003406f0 kernel: DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 kernel: DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 kernel: Call Trace: kernel: transport_free_session+0x67/0x140 kernel: transport_deregister_session+0x7a/0xc0 kernel: iscsit_close_session+0x92/0x210 kernel: iscsit_close_connection+0x5f9/0x840 kernel: iscsit_take_action_for_connection_exit+0xfe/0x110 kernel: iscsi_target_tx_thread+0x140/0x1e0 kernel: ? wait_woken+0x90/0x90 kernel: kthread+0x124/0x160 kernel: ? iscsit_thread_get_cpumask+0x90/0x90 kernel: ? kthread_create_on_node+0x40/0x40 kernel: ret_from_fork+0x22/0x30 kernel: Code: 00 48 89 fb 4c 8b a7 48 01 00 00 74 68 4d 8d 6c 24 08 4c 89 ef e8 e8 28 43 00 48 8b 93 20 04 00 00 48 8b 83 28 04 00 00 4c 89 ef <48> 89 42 08 48 89 10 48 b8 00 01 00 00 00 00 ad de 48 89 83 20 kernel: RIP: target_put_nacl+0x49/0xb0 RSP: ffffc90007887d70 kernel: ---[ end trace f12821adbfd46fed ]--- To address this, go ahead and use proper list_del_list() for all cases of se_nacl->acl_list deletion. Reported-by: Justin Maggard <[email protected]> Tested-by: Justin Maggard <[email protected]> Cc: Justin Maggard <[email protected]> Cc: [email protected] # 4.1+ Signed-off-by: Nicholas Bellinger <[email protected]>

…-text symbols" This reverts commit 83e840c ("powerpc64/elfv1: Only dereference function descriptor for non-text symbols"). Chandan reported that on newer kernels, trying to enable function_graph tracer on ppc64 (BE) locks up the system with the following trace: Unable to handle kernel paging request for data at address 0x600000002fa30010 Faulting instruction address: 0xc0000000001f1300 Thread overran stack, or stack corrupted Oops: Kernel access of bad area, sig: 11 [#1] BE SMP NR_CPUS=2048 DEBUG_PAGEALLOC NUMA pSeries Modules linked in: CPU: 1 PID: 6586 Comm: bash Not tainted 4.14.0-rc3-00162-g6e51f1f-dirty #20 task: c000000625c07200 task.stack: c000000625c07310 NIP: c0000000001f1300 LR: c000000000121cac CTR: c000000000061af8 REGS: c000000625c088c0 TRAP: 0380 Not tainted (4.14.0-rc3-00162-g6e51f1f-dirty) MSR: 8000000000001032 <SF,ME,IR,DR,RI> CR: 28002848 XER: 00000000 CFAR: c0000000001f1320 SOFTE: 0 ... NIP [c0000000001f1300] .__is_insn_slot_addr+0x30/0x90 LR [c000000000121cac] .kernel_text_address+0x18c/0x1c0 Call Trace: [c000000625c08b40] [c0000000001bd040] .is_module_text_address+0x20/0x40 (unreliable) [c000000625c08bc0] [c000000000121cac] .kernel_text_address+0x18c/0x1c0 [c000000625c08c50] [c000000000061960] .prepare_ftrace_return+0x50/0x130 [c000000625c08cf0] [c000000000061b10] .ftrace_graph_caller+0x14/0x34 [c000000625c08d60] [c000000000121b40] .kernel_text_address+0x20/0x1c0 [c000000625c08df0] [c000000000061960] .prepare_ftrace_return+0x50/0x130 ... [c000000625c0ab30] [c000000000061960] .prepare_ftrace_return+0x50/0x130 [c000000625c0abd0] [c000000000061b10] .ftrace_graph_caller+0x14/0x34 [c000000625c0ac40] [c000000000121b40] .kernel_text_address+0x20/0x1c0 [c000000625c0acd0] [c000000000061960] .prepare_ftrace_return+0x50/0x130 [c000000625c0ad70] [c000000000061b10] .ftrace_graph_caller+0x14/0x34 [c000000625c0ade0] [c000000000121b40] .kernel_text_address+0x20/0x1c0 This is because ftrace is using ppc_function_entry() for obtaining the address of return_to_handler() in prepare_ftrace_return(). The call to kernel_text_address() itself gets traced and we end up in a recursive loop. Fixes: 83e840c ("powerpc64/elfv1: Only dereference function descriptor for non-text symbols") Cc: [email protected] # v4.13+ Reported-by: Chandan Rajendra <[email protected]> Signed-off-by: Naveen N. Rao <[email protected]> Signed-off-by: Michael Ellerman <[email protected]>

…-text symbols" commit 63be1a8 upstream. This reverts commit 83e840c ("powerpc64/elfv1: Only dereference function descriptor for non-text symbols"). Chandan reported that on newer kernels, trying to enable function_graph tracer on ppc64 (BE) locks up the system with the following trace: Unable to handle kernel paging request for data at address 0x600000002fa30010 Faulting instruction address: 0xc0000000001f1300 Thread overran stack, or stack corrupted Oops: Kernel access of bad area, sig: 11 [#1] BE SMP NR_CPUS=2048 DEBUG_PAGEALLOC NUMA pSeries Modules linked in: CPU: 1 PID: 6586 Comm: bash Not tainted 4.14.0-rc3-00162-g6e51f1f-dirty #20 task: c000000625c07200 task.stack: c000000625c07310 NIP: c0000000001f1300 LR: c000000000121cac CTR: c000000000061af8 REGS: c000000625c088c0 TRAP: 0380 Not tainted (4.14.0-rc3-00162-g6e51f1f-dirty) MSR: 8000000000001032 <SF,ME,IR,DR,RI> CR: 28002848 XER: 00000000 CFAR: c0000000001f1320 SOFTE: 0 ... NIP [c0000000001f1300] .__is_insn_slot_addr+0x30/0x90 LR [c000000000121cac] .kernel_text_address+0x18c/0x1c0 Call Trace: [c000000625c08b40] [c0000000001bd040] .is_module_text_address+0x20/0x40 (unreliable) [c000000625c08bc0] [c000000000121cac] .kernel_text_address+0x18c/0x1c0 [c000000625c08c50] [c000000000061960] .prepare_ftrace_return+0x50/0x130 [c000000625c08cf0] [c000000000061b10] .ftrace_graph_caller+0x14/0x34 [c000000625c08d60] [c000000000121b40] .kernel_text_address+0x20/0x1c0 [c000000625c08df0] [c000000000061960] .prepare_ftrace_return+0x50/0x130 ... [c000000625c0ab30] [c000000000061960] .prepare_ftrace_return+0x50/0x130 [c000000625c0abd0] [c000000000061b10] .ftrace_graph_caller+0x14/0x34 [c000000625c0ac40] [c000000000121b40] .kernel_text_address+0x20/0x1c0 [c000000625c0acd0] [c000000000061960] .prepare_ftrace_return+0x50/0x130 [c000000625c0ad70] [c000000000061b10] .ftrace_graph_caller+0x14/0x34 [c000000625c0ade0] [c000000000121b40] .kernel_text_address+0x20/0x1c0 This is because ftrace is using ppc_function_entry() for obtaining the address of return_to_handler() in prepare_ftrace_return(). The call to kernel_text_address() itself gets traced and we end up in a recursive loop. Fixes: 83e840c ("powerpc64/elfv1: Only dereference function descriptor for non-text symbols") Reported-by: Chandan Rajendra <[email protected]> Signed-off-by: Naveen N. Rao <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>

When a GSO skb of truesize O is segmented into 2 new skbs of truesize N1 and N2, we want to transfer socket ownership to the new fresh skbs. In order to avoid expensive atomic operations on a cache line subject to cache bouncing, we replace the sequence : refcount_add(N1, &sk->sk_wmem_alloc); refcount_add(N2, &sk->sk_wmem_alloc); // repeated by number of segments refcount_sub(O, &sk->sk_wmem_alloc); by a single refcount_add(sum_of(N) - O, &sk->sk_wmem_alloc); Problem is : In some pathological cases, sum(N) - O might be a negative number, and syzkaller bot was apparently able to trigger this trace [1] atomic_t was ok with this construct, but we need to take care of the negative delta with refcount_t [1] refcount_t: saturated; leaking memory. ------------[ cut here ]------------ WARNING: CPU: 0 PID: 8404 at lib/refcount.c:77 refcount_add_not_zero+0x198/0x200 lib/refcount.c:77 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 8404 Comm: syz-executor2 Not tainted 4.14.0-rc5-mm1+ #20 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:16 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:52 panic+0x1e4/0x41c kernel/panic.c:183 __warn+0x1c4/0x1e0 kernel/panic.c:546 report_bug+0x211/0x2d0 lib/bug.c:183 fixup_bug+0x40/0x90 arch/x86/kernel/traps.c:177 do_trap_no_signal arch/x86/kernel/traps.c:211 [inline] do_trap+0x260/0x390 arch/x86/kernel/traps.c:260 do_error_trap+0x120/0x390 arch/x86/kernel/traps.c:297 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:310 invalid_op+0x18/0x20 arch/x86/entry/entry_64.S:905 RIP: 0010:refcount_add_not_zero+0x198/0x200 lib/refcount.c:77 RSP: 0018:ffff8801c606e3a0 EFLAGS: 00010282 RAX: 0000000000000026 RBX: 0000000000001401 RCX: 0000000000000000 RDX: 0000000000000026 RSI: ffffc900036fc000 RDI: ffffed0038c0dc68 RBP: ffff8801c606e430 R08: 0000000000000001 R09: 0000000000000000 R10: ffff8801d97f5eba R11: 0000000000000000 R12: ffff8801d5acf73c R13: 1ffff10038c0dc75 R14: 00000000ffffffff R15: 00000000fffff72f refcount_add+0x1b/0x60 lib/refcount.c:101 tcp_gso_segment+0x10d0/0x16b0 net/ipv4/tcp_offload.c:155 tcp4_gso_segment+0xd4/0x310 net/ipv4/tcp_offload.c:51 inet_gso_segment+0x60c/0x11c0 net/ipv4/af_inet.c:1271 skb_mac_gso_segment+0x33f/0x660 net/core/dev.c:2749 __skb_gso_segment+0x35f/0x7f0 net/core/dev.c:2821 skb_gso_segment include/linux/netdevice.h:3971 [inline] validate_xmit_skb+0x4ba/0xb20 net/core/dev.c:3074 __dev_queue_xmit+0xe49/0x2070 net/core/dev.c:3497 dev_queue_xmit+0x17/0x20 net/core/dev.c:3538 neigh_hh_output include/net/neighbour.h:471 [inline] neigh_output include/net/neighbour.h:479 [inline] ip_finish_output2+0xece/0x1460 net/ipv4/ip_output.c:229 ip_finish_output+0x85e/0xd10 net/ipv4/ip_output.c:317 NF_HOOK_COND include/linux/netfilter.h:238 [inline] ip_output+0x1cc/0x860 net/ipv4/ip_output.c:405 dst_output include/net/dst.h:459 [inline] ip_local_out+0x95/0x160 net/ipv4/ip_output.c:124 ip_queue_xmit+0x8c6/0x18e0 net/ipv4/ip_output.c:504 tcp_transmit_skb+0x1ab7/0x3840 net/ipv4/tcp_output.c:1137 tcp_write_xmit+0x663/0x4de0 net/ipv4/tcp_output.c:2341 __tcp_push_pending_frames+0xa0/0x250 net/ipv4/tcp_output.c:2513 tcp_push_pending_frames include/net/tcp.h:1722 [inline] tcp_data_snd_check net/ipv4/tcp_input.c:5050 [inline] tcp_rcv_established+0x8c7/0x18a0 net/ipv4/tcp_input.c:5497 tcp_v4_do_rcv+0x2ab/0x7d0 net/ipv4/tcp_ipv4.c:1460 sk_backlog_rcv include/net/sock.h:909 [inline] __release_sock+0x124/0x360 net/core/sock.c:2264 release_sock+0xa4/0x2a0 net/core/sock.c:2776 tcp_sendmsg+0x3a/0x50 net/ipv4/tcp.c:1462 inet_sendmsg+0x11f/0x5e0 net/ipv4/af_inet.c:763 sock_sendmsg_nosec net/socket.c:632 [inline] sock_sendmsg+0xca/0x110 net/socket.c:642 ___sys_sendmsg+0x31c/0x890 net/socket.c:2048 __sys_sendmmsg+0x1e6/0x5f0 net/socket.c:2138 Fixes: 14afee4 ("net: convert sock.sk_wmem_alloc from atomic_t to refcount_t") Signed-off-by: Eric Dumazet <[email protected]> Reported-by: syzbot <[email protected]> Signed-off-by: David S. Miller <[email protected]>

[ Upstream commit 7ec318f ] When a GSO skb of truesize O is segmented into 2 new skbs of truesize N1 and N2, we want to transfer socket ownership to the new fresh skbs. In order to avoid expensive atomic operations on a cache line subject to cache bouncing, we replace the sequence : refcount_add(N1, &sk->sk_wmem_alloc); refcount_add(N2, &sk->sk_wmem_alloc); // repeated by number of segments refcount_sub(O, &sk->sk_wmem_alloc); by a single refcount_add(sum_of(N) - O, &sk->sk_wmem_alloc); Problem is : In some pathological cases, sum(N) - O might be a negative number, and syzkaller bot was apparently able to trigger this trace [1] atomic_t was ok with this construct, but we need to take care of the negative delta with refcount_t [1] refcount_t: saturated; leaking memory. ------------[ cut here ]------------ WARNING: CPU: 0 PID: 8404 at lib/refcount.c:77 refcount_add_not_zero+0x198/0x200 lib/refcount.c:77 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 8404 Comm: syz-executor2 Not tainted 4.14.0-rc5-mm1+ #20 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:16 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:52 panic+0x1e4/0x41c kernel/panic.c:183 __warn+0x1c4/0x1e0 kernel/panic.c:546 report_bug+0x211/0x2d0 lib/bug.c:183 fixup_bug+0x40/0x90 arch/x86/kernel/traps.c:177 do_trap_no_signal arch/x86/kernel/traps.c:211 [inline] do_trap+0x260/0x390 arch/x86/kernel/traps.c:260 do_error_trap+0x120/0x390 arch/x86/kernel/traps.c:297 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:310 invalid_op+0x18/0x20 arch/x86/entry/entry_64.S:905 RIP: 0010:refcount_add_not_zero+0x198/0x200 lib/refcount.c:77 RSP: 0018:ffff8801c606e3a0 EFLAGS: 00010282 RAX: 0000000000000026 RBX: 0000000000001401 RCX: 0000000000000000 RDX: 0000000000000026 RSI: ffffc900036fc000 RDI: ffffed0038c0dc68 RBP: ffff8801c606e430 R08: 0000000000000001 R09: 0000000000000000 R10: ffff8801d97f5eba R11: 0000000000000000 R12: ffff8801d5acf73c R13: 1ffff10038c0dc75 R14: 00000000ffffffff R15: 00000000fffff72f refcount_add+0x1b/0x60 lib/refcount.c:101 tcp_gso_segment+0x10d0/0x16b0 net/ipv4/tcp_offload.c:155 tcp4_gso_segment+0xd4/0x310 net/ipv4/tcp_offload.c:51 inet_gso_segment+0x60c/0x11c0 net/ipv4/af_inet.c:1271 skb_mac_gso_segment+0x33f/0x660 net/core/dev.c:2749 __skb_gso_segment+0x35f/0x7f0 net/core/dev.c:2821 skb_gso_segment include/linux/netdevice.h:3971 [inline] validate_xmit_skb+0x4ba/0xb20 net/core/dev.c:3074 __dev_queue_xmit+0xe49/0x2070 net/core/dev.c:3497 dev_queue_xmit+0x17/0x20 net/core/dev.c:3538 neigh_hh_output include/net/neighbour.h:471 [inline] neigh_output include/net/neighbour.h:479 [inline] ip_finish_output2+0xece/0x1460 net/ipv4/ip_output.c:229 ip_finish_output+0x85e/0xd10 net/ipv4/ip_output.c:317 NF_HOOK_COND include/linux/netfilter.h:238 [inline] ip_output+0x1cc/0x860 net/ipv4/ip_output.c:405 dst_output include/net/dst.h:459 [inline] ip_local_out+0x95/0x160 net/ipv4/ip_output.c:124 ip_queue_xmit+0x8c6/0x18e0 net/ipv4/ip_output.c:504 tcp_transmit_skb+0x1ab7/0x3840 net/ipv4/tcp_output.c:1137 tcp_write_xmit+0x663/0x4de0 net/ipv4/tcp_output.c:2341 __tcp_push_pending_frames+0xa0/0x250 net/ipv4/tcp_output.c:2513 tcp_push_pending_frames include/net/tcp.h:1722 [inline] tcp_data_snd_check net/ipv4/tcp_input.c:5050 [inline] tcp_rcv_established+0x8c7/0x18a0 net/ipv4/tcp_input.c:5497 tcp_v4_do_rcv+0x2ab/0x7d0 net/ipv4/tcp_ipv4.c:1460 sk_backlog_rcv include/net/sock.h:909 [inline] __release_sock+0x124/0x360 net/core/sock.c:2264 release_sock+0xa4/0x2a0 net/core/sock.c:2776 tcp_sendmsg+0x3a/0x50 net/ipv4/tcp.c:1462 inet_sendmsg+0x11f/0x5e0 net/ipv4/af_inet.c:763 sock_sendmsg_nosec net/socket.c:632 [inline] sock_sendmsg+0xca/0x110 net/socket.c:642 ___sys_sendmsg+0x31c/0x890 net/socket.c:2048 __sys_sendmmsg+0x1e6/0x5f0 net/socket.c:2138 Fixes: 14afee4 ("net: convert sock.sk_wmem_alloc from atomic_t to refcount_t") Signed-off-by: Eric Dumazet <[email protected]> Reported-by: syzbot <[email protected]> Signed-off-by: David S. Miller <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>

[ Upstream commit af50e4b ] syzbot caught an infinite recursion in nsh_gso_segment(). Problem here is that we need to make sure the NSH header is of reasonable length. BUG: MAX_LOCK_DEPTH too low! turning off the locking correctness validator. depth: 48 max: 48! 48 locks held by syz-executor0/10189: #0: (ptrval) (rcu_read_lock_bh){....}, at: __dev_queue_xmit+0x30f/0x34c0 net/core/dev.c:3517 #1: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] #1: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 #2: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] #2: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 #3: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] #3: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 #4: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] #4: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 #5: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] #5: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 #6: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] #6: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 #7: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] #7: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 #8: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] #8: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 #9: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] #9: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 #10: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] #10: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 #11: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] #11: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 #12: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] #12: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 #13: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] #13: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 #14: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] #14: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 #15: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] #15: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 #16: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] #16: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 #17: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] #17: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 #18: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] #18: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 #19: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] #19: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 #20: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] #20: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 #21: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] #21: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 #22: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] #22: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 #23: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] #23: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 #24: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] #24: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 #25: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] #25: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 #26: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] #26: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 #27: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] #27: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 #28: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] #28: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 #29: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] #29: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 #30: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] #30: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 #31: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] #31: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 dccp_close: ABORT with 65423 bytes unread #32: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] #32: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 #33: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] #33: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 #34: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] #34: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 #35: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] #35: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 #36: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] #36: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 #37: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] #37: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 #38: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] #38: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 #39: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] #39: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 #40: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] #40: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 #41: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] #41: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 #42: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] #42: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 #43: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] #43: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 #44: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] #44: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 #45: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] #45: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 #46: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] #46: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 #47: (ptrval) (rcu_read_lock){....}, at: __skb_pull include/linux/skbuff.h:2080 [inline] #47: (ptrval) (rcu_read_lock){....}, at: skb_mac_gso_segment+0x221/0x720 net/core/dev.c:2787 INFO: lockdep is turned off. CPU: 1 PID: 10189 Comm: syz-executor0 Not tainted 4.17.0-rc2+ #26 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1b9/0x294 lib/dump_stack.c:113 __lock_acquire+0x1788/0x5140 kernel/locking/lockdep.c:3449 lock_acquire+0x1dc/0x520 kernel/locking/lockdep.c:3920 rcu_lock_acquire include/linux/rcupdate.h:246 [inline] rcu_read_lock include/linux/rcupdate.h:632 [inline] skb_mac_gso_segment+0x25b/0x720 net/core/dev.c:2789 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 nsh_gso_segment+0x405/0xb60 net/nsh/nsh.c:107 skb_mac_gso_segment+0x3ad/0x720 net/core/dev.c:2792 __skb_gso_segment+0x3bb/0x870 net/core/dev.c:2865 skb_gso_segment include/linux/netdevice.h:4025 [inline] validate_xmit_skb+0x54d/0xd90 net/core/dev.c:3118 validate_xmit_skb_list+0xbf/0x120 net/core/dev.c:3168 sch_direct_xmit+0x354/0x11e0 net/sched/sch_generic.c:312 qdisc_restart net/sched/sch_generic.c:399 [inline] __qdisc_run+0x741/0x1af0 net/sched/sch_generic.c:410 __dev_xmit_skb net/core/dev.c:3243 [inline] __dev_queue_xmit+0x28ea/0x34c0 net/core/dev.c:3551 dev_queue_xmit+0x17/0x20 net/core/dev.c:3616 packet_snd net/packet/af_packet.c:2951 [inline] packet_sendmsg+0x40f8/0x6070 net/packet/af_packet.c:2976 sock_sendmsg_nosec net/socket.c:629 [inline] sock_sendmsg+0xd5/0x120 net/socket.c:639 __sys_sendto+0x3d7/0x670 net/socket.c:1789 __do_sys_sendto net/socket.c:1801 [inline] __se_sys_sendto net/socket.c:1797 [inline] __x64_sys_sendto+0xe1/0x1a0 net/socket.c:1797 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe Fixes: c411ed8 ("nsh: add GSO support") Signed-off-by: Eric Dumazet <[email protected]> Cc: Jiri Benc <[email protected]> Reported-by: syzbot <[email protected]> Acked-by: Jiri Benc <[email protected]> Signed-off-by: David S. Miller <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>

commit a5ba1d9 upstream. We have reports of the following crash: PID: 7 TASK: ffff88085c6d61c0 CPU: 1 COMMAND: "kworker/u25:0" #0 [ffff88085c6db710] machine_kexec at ffffffff81046239 #1 [ffff88085c6db760] crash_kexec at ffffffff810fc248 #2 [ffff88085c6db830] oops_end at ffffffff81008ae7 #3 [ffff88085c6db860] no_context at ffffffff81050b8f #4 [ffff88085c6db8b0] __bad_area_nosemaphore at ffffffff81050d75 #5 [ffff88085c6db900] bad_area_nosemaphore at ffffffff81050e83 #6 [ffff88085c6db910] __do_page_fault at ffffffff8105132e #7 [ffff88085c6db9b0] do_page_fault at ffffffff8105152c #8 [ffff88085c6db9c0] page_fault at ffffffff81a3f122 [exception RIP: uart_put_char+149] RIP: ffffffff814b67b5 RSP: ffff88085c6dba78 RFLAGS: 00010006 RAX: 0000000000000292 RBX: ffffffff827c5120 RCX: 0000000000000081 RDX: 0000000000000000 RSI: 000000000000005f RDI: ffffffff827c5120 RBP: ffff88085c6dba98 R8: 000000000000012c R9: ffffffff822ea320 R10: ffff88085fe4db04 R11: 0000000000000001 R12: ffff881059f9c000 R13: 0000000000000001 R14: 000000000000005f R15: 0000000000000fba ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018 #9 [ffff88085c6dbaa0] tty_put_char at ffffffff81497544 #10 [ffff88085c6dbac0] do_output_char at ffffffff8149c91c #11 [ffff88085c6dbae0] __process_echoes at ffffffff8149cb8b #12 [ffff88085c6dbb30] commit_echoes at ffffffff8149cdc2 #13 [ffff88085c6dbb60] n_tty_receive_buf_fast at ffffffff8149e49b #14 [ffff88085c6dbbc0] __receive_buf at ffffffff8149ef5a #15 [ffff88085c6dbc20] n_tty_receive_buf_common at ffffffff8149f016 #16 [ffff88085c6dbca0] n_tty_receive_buf2 at ffffffff8149f194 #17 [ffff88085c6dbcb0] flush_to_ldisc at ffffffff814a238a #18 [ffff88085c6dbd50] process_one_work at ffffffff81090be2 #19 [ffff88085c6dbe20] worker_thread at ffffffff81091b4d #20 [ffff88085c6dbeb0] kthread at ffffffff81096384 #21 [ffff88085c6dbf50] ret_from_fork at ffffffff81a3d69f after slogging through some dissasembly: ffffffff814b6720 <uart_put_char>: ffffffff814b6720: 55 push %rbp ffffffff814b6721: 48 89 e5 mov %rsp,%rbp ffffffff814b6724: 48 83 ec 20 sub $0x20,%rsp ffffffff814b6728: 48 89 1c 24 mov %rbx,(%rsp) ffffffff814b672c: 4c 89 64 24 08 mov %r12,0x8(%rsp) ffffffff814b6731: 4c 89 6c 24 10 mov %r13,0x10(%rsp) ffffffff814b6736: 4c 89 74 24 18 mov %r14,0x18(%rsp) ffffffff814b673b: e8 b0 8e 58 00 callq ffffffff81a3f5f0 <mcount> ffffffff814b6740: 4c 8b a7 88 02 00 00 mov 0x288(%rdi),%r12 ffffffff814b6747: 45 31 ed xor %r13d,%r13d ffffffff814b674a: 41 89 f6 mov %esi,%r14d ffffffff814b674d: 49 83 bc 24 70 01 00 cmpq $0x0,0x170(%r12) ffffffff814b6754: 00 00 ffffffff814b6756: 49 8b 9c 24 80 01 00 mov 0x180(%r12),%rbx ffffffff814b675d: 00 ffffffff814b675e: 74 2f je ffffffff814b678f <uart_put_char+0x6f> ffffffff814b6760: 48 89 df mov %rbx,%rdi ffffffff814b6763: e8 a8 67 58 00 callq ffffffff81a3cf10 <_raw_spin_lock_irqsave> ffffffff814b6768: 41 8b 8c 24 78 01 00 mov 0x178(%r12),%ecx ffffffff814b676f: 00 ffffffff814b6770: 89 ca mov %ecx,%edx ffffffff814b6772: f7 d2 not %edx ffffffff814b6774: 41 03 94 24 7c 01 00 add 0x17c(%r12),%edx ffffffff814b677b: 00 ffffffff814b677c: 81 e2 ff 0f 00 00 and $0xfff,%edx ffffffff814b6782: 75 23 jne ffffffff814b67a7 <uart_put_char+0x87> ffffffff814b6784: 48 89 c6 mov %rax,%rsi ffffffff814b6787: 48 89 df mov %rbx,%rdi ffffffff814b678a: e8 e1 64 58 00 callq ffffffff81a3cc70 <_raw_spin_unlock_irqrestore> ffffffff814b678f: 44 89 e8 mov %r13d,%eax ffffffff814b6792: 48 8b 1c 24 mov (%rsp),%rbx ffffffff814b6796: 4c 8b 64 24 08 mov 0x8(%rsp),%r12 ffffffff814b679b: 4c 8b 6c 24 10 mov 0x10(%rsp),%r13 ffffffff814b67a0: 4c 8b 74 24 18 mov 0x18(%rsp),%r14 ffffffff814b67a5: c9 leaveq ffffffff814b67a6: c3 retq ffffffff814b67a7: 49 8b 94 24 70 01 00 mov 0x170(%r12),%rdx ffffffff814b67ae: 00 ffffffff814b67af: 48 63 c9 movslq %ecx,%rcx ffffffff814b67b2: 41 b5 01 mov $0x1,%r13b ffffffff814b67b5: 44 88 34 0a mov %r14b,(%rdx,%rcx,1) ffffffff814b67b9: 41 8b 94 24 78 01 00 mov 0x178(%r12),%edx ffffffff814b67c0: 00 ffffffff814b67c1: 83 c2 01 add $0x1,%edx ffffffff814b67c4: 81 e2 ff 0f 00 00 and $0xfff,%edx ffffffff814b67ca: 41 89 94 24 78 01 00 mov %edx,0x178(%r12) ffffffff814b67d1: 00 ffffffff814b67d2: eb b0 jmp ffffffff814b6784 <uart_put_char+0x64> ffffffff814b67d4: 66 66 66 2e 0f 1f 84 data32 data32 nopw %cs:0x0(%rax,%rax,1) ffffffff814b67db: 00 00 00 00 00 for our build, this is crashing at: circ->buf[circ->head] = c; Looking in uart_port_startup(), it seems that circ->buf (state->xmit.buf) protected by the "per-port mutex", which based on uart_port_check() is state->port.mutex. Indeed, the lock acquired in uart_put_char() is uport->lock, i.e. not the same lock. Anyway, since the lock is not acquired, if uart_shutdown() is called, the last chunk of that function may release state->xmit.buf before its assigned to null, and cause the race above. To fix it, let's lock uport->lock when allocating/deallocating state->xmit.buf in addition to the per-port mutex. v2: switch to locking uport->lock on allocation/deallocation instead of locking the per-port mutex in uart_put_char. Note that since uport->lock is a spin lock, we have to switch the allocation to GFP_ATOMIC. v3: move the allocation outside the lock, so we can switch back to GFP_KERNEL Signed-off-by: Tycho Andersen <[email protected]> Cc: stable <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>

[ Upstream commit 20cdcaf ] During the duplication of em28xx state for the second tuner pair a pointer to alt_max_pkt_size_isoc is copied. During tear down the second tuner is destroyed first and kfrees alt_max_pkt_size_isoc, then the first tuner is destroyed and kfrees it again. The property should only be kfree'd if the tuner is PRIMARY_TS. [ 354.888560] ------------[ cut here ]------------ [ 354.888562] kernel BUG at mm/slub.c:296! [ 354.888574] invalid opcode: 0000 [#1] SMP NOPTI [ 354.888869] CPU: 1 PID: 19 Comm: kworker/1:0 Not tainted 4.18.0-rc1+ #20 [ 354.889140] Hardware name: MSI MS-7A39/B350M GAMING PRO (MS-7A39), BIOS 2.G0 04/27/2018 [ 354.889408] Workqueue: usb_hub_wq hub_event [ 354.889679] RIP: 0010:__slab_free+0x217/0x370 [ 354.889942] Code: bb c0 e8 07 41 38 c7 72 39 48 83 c4 70 5b 41 5a 41 5c 41 5d 41 5e 41 5f 5d 49 8d 62 f8 c3 f3 90 49 8b 04 24 a8 01 75 f6 eb 82 <0f> 0b 44 89 45 80 48 89 4d 88 e8 aa fa ff ff 85 c0 74 cc e9 b7 fe [ 354.890598] RSP: 0018:ffffb84c41a4fad0 EFLAGS: 00010246 [ 354.890934] RAX: ffff948646e85150 RBX: ffff948646e85150 RCX: ffff948646e85150 [ 354.891280] RDX: 00000000820001d9 RSI: fffffa8fd01ba140 RDI: ffff94865e807c00 [ 354.891649] RBP: ffffb84c41a4fb70 R08: 0000000000000001 R09: ffffffffc059ce21 [ 354.892025] R10: ffff948646e85150 R11: 0000000000000001 R12: fffffa8fd01ba140 [ 354.892403] R13: ffff948646e85150 R14: ffff94865e807c00 R15: ffff94864c92e0a0 [ 354.892780] FS: 0000000000000000(0000) GS:ffff94865ec40000(0000) knlGS:0000000000000000 [ 354.893150] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 354.893530] CR2: 00007f4e476da950 CR3: 000000040112c000 CR4: 00000000003406e0 [ 354.893917] Call Trace: [ 354.894315] ? __dev_printk+0x3c/0x80 [ 354.894695] ? _dev_info+0x64/0x80 [ 354.895082] ? em28xx_free_device+0x41/0x50 [em28xx] [ 354.895464] kfree+0x17a/0x190 [ 354.895852] ? kfree+0x17a/0x190 [ 354.896310] em28xx_free_device+0x41/0x50 [em28xx] [ 354.896698] em28xx_usb_disconnect+0xfa/0x110 [em28xx] [ 354.897083] usb_unbind_interface+0x7a/0x270 [ 354.897475] device_release_driver_internal+0x17c/0x250 [ 354.897864] device_release_driver+0x12/0x20 [ 354.898252] bus_remove_device+0xec/0x160 [ 354.898639] device_del+0x13d/0x320 [ 354.899018] ? usb_remove_ep_devs+0x1f/0x30 [ 354.899392] usb_disable_device+0x9e/0x270 [ 354.899772] usb_disconnect+0x92/0x2a0 [ 354.900149] hub_event+0x98e/0x1650 [ 354.900519] ? sched_clock_cpu+0x11/0xa0 [ 354.900890] process_one_work+0x167/0x3f0 [ 354.901251] worker_thread+0x4d/0x460 [ 354.901610] kthread+0x105/0x140 [ 354.901964] ? rescuer_thread+0x360/0x360 [ 354.902318] ? kthread_associate_blkcg+0xa0/0xa0 [ 354.902672] ret_from_fork+0x22/0x40 [ 354.903024] Modules linked in: rc_hauppauge em28xx_rc rc_core si2157 lgdt3306a i2c_mux em28xx_dvb dvb_core videobuf2_vmalloc videobuf2_memops videobuf2_common snd_hda_codec_hdmi nls_iso8859_1 edac_mce_amd kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc snd_hda_intel snd_hda_codec snd_hda_core snd_hwdep snd_pcm snd_seq_midi aesni_intel snd_seq_midi_event aes_x86_64 snd_rawmidi crypto_simd em28xx cryptd glue_helper asix tveeprom usbnet snd_seq v4l2_common mii videodev snd_seq_device media input_leds snd_timer joydev ccp k10temp wmi_bmof snd soundcore mac_hid sch_fq_codel parport_pc ppdev lp parport ip_tables x_tables vfio_pci vfio_virqfd irqbypass vfio_iommu_type1 vfio nouveau mxm_wmi video i2c_algo_bit ttm drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops i2c_piix4 drm ahci libahci [ 354.905129] wmi gpio_amdpt gpio_generic hid_generic usbhid hid [ 354.908140] ---[ end trace c230d02716298c34 ]--- [ 354.908145] RIP: 0010:__slab_free+0x217/0x370 [ 354.908147] Code: bb c0 e8 07 41 38 c7 72 39 48 83 c4 70 5b 41 5a 41 5c 41 5d 41 5e 41 5f 5d 49 8d 62 f8 c3 f3 90 49 8b 04 24 a8 01 75 f6 eb 82 <0f> 0b 44 89 45 80 48 89 4d 88 e8 aa fa ff ff 85 c0 74 cc e9 b7 fe [ 354.908183] RSP: 0018:ffffb84c41a4fad0 EFLAGS: 00010246 [ 354.908186] RAX: ffff948646e85150 RBX: ffff948646e85150 RCX: ffff948646e85150 [ 354.908189] RDX: 00000000820001d9 RSI: fffffa8fd01ba140 RDI: ffff94865e807c00 [ 354.908191] RBP: ffffb84c41a4fb70 R08: 0000000000000001 R09: ffffffffc059ce21 [ 354.908193] R10: ffff948646e85150 R11: 0000000000000001 R12: fffffa8fd01ba140 [ 354.908195] R13: ffff948646e85150 R14: ffff94865e807c00 R15: ffff94864c92e0a0 [ 354.908198] FS: 0000000000000000(0000) GS:ffff94865ec40000(0000) knlGS:0000000000000000 [ 354.908201] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 354.908203] CR2: 00007f4e476da950 CR3: 000000016b20a000 CR4: 00000000003406e0 Signed-off-by: Brad Love <[email protected]> Signed-off-by: Michael Ira Krufky <[email protected]> Signed-off-by: Mauro Carvalho Chehab <[email protected]> Signed-off-by: Sasha Levin <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>

commit 97b2a31 upstream. Currently on driver bringup with KASAN enabled, meson triggers an OOB memory access as shown below: [ 117.904528] ================================================================== [ 117.904560] BUG: KASAN: global-out-of-bounds in meson_viu_set_osd_lut+0x7a0/0x890 [ 117.904588] Read of size 4 at addr ffff20000a63ce24 by task systemd-udevd/498 [ 117.904601] [ 118.083372] CPU: 4 PID: 498 Comm: systemd-udevd Not tainted 4.20.0-rc3Lyude-Test+ #20 [ 118.091143] Hardware name: amlogic khadas-vim2/khadas-vim2, BIOS 2018.07-rc2-armbian 09/11/2018 [ 118.099768] Call trace: [ 118.102181] dump_backtrace+0x0/0x3e8 [ 118.105796] show_stack+0x14/0x20 [ 118.109083] dump_stack+0x130/0x1c4 [ 118.112539] print_address_description+0x60/0x25c [ 118.117214] kasan_report+0x1b4/0x368 [ 118.120851] __asan_report_load4_noabort+0x18/0x20 [ 118.125566] meson_viu_set_osd_lut+0x7a0/0x890 [ 118.129953] meson_viu_init+0x10c/0x290 [ 118.133741] meson_drv_bind_master+0x474/0x748 [ 118.138141] meson_drv_bind+0x10/0x18 [ 118.141760] try_to_bring_up_master+0x3d8/0x768 [ 118.146249] component_add+0x214/0x570 [ 118.149978] meson_dw_hdmi_probe+0x18/0x20 [meson_dw_hdmi] [ 118.155404] platform_drv_probe+0x98/0x138 [ 118.159455] really_probe+0x2a0/0xa70 [ 118.163070] driver_probe_device+0x1b4/0x2d8 [ 118.167299] __driver_attach+0x200/0x280 [ 118.171189] bus_for_each_dev+0x10c/0x1a8 [ 118.175144] driver_attach+0x38/0x50 [ 118.178681] bus_add_driver+0x330/0x608 [ 118.182471] driver_register+0x140/0x388 [ 118.186361] __platform_driver_register+0xc8/0x108 [ 118.191117] meson_dw_hdmi_platform_driver_init+0x1c/0x1000 [meson_dw_hdmi] [ 118.198022] do_one_initcall+0x12c/0x3bc [ 118.201883] do_init_module+0x1fc/0x638 [ 118.205673] load_module+0x4b4c/0x6808 [ 118.209387] __se_sys_init_module+0x2e8/0x3c0 [ 118.213699] __arm64_sys_init_module+0x68/0x98 [ 118.218100] el0_svc_common+0x104/0x210 [ 118.221893] el0_svc_handler+0x48/0xb8 [ 118.225594] el0_svc+0x8/0xc [ 118.228429] [ 118.229887] The buggy address belongs to the variable: [ 118.235007] eotf_33_linear_mapping+0x84/0xc0 [ 118.239301] [ 118.240752] Memory state around the buggy address: [ 118.245522] ffff20000a63cd00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 118.252695] ffff20000a63cd80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 118.259850] >ffff20000a63ce00: 00 00 00 00 04 fa fa fa fa fa fa fa 00 00 00 00 [ 118.267000] ^ [ 118.271222] ffff20000a63ce80: 00 fa fa fa fa fa fa fa 00 00 00 00 00 00 00 00 [ 118.278393] ffff20000a63cf00: 00 00 00 00 00 00 00 00 00 00 00 00 04 fa fa fa [ 118.285542] ================================================================== [ 118.292699] Disabling lock debugging due to kernel taint It seems that when looping through the OSD EOTF LUT maps, we use the same max iterator for OETF: 20. This is wrong though, since 20*2 is 40, which means that we'll stop out of bounds on the EOTF maps. But, this whole thing is already confusing enough to read through as-is, so let's just replace all of the hardcoded sizes with OSD_(OETF/EOTF)_LUT_SIZE / 2. Signed-off-by: Lyude Paul <[email protected]> Fixes: bbbe775 ("drm: Add support for Amlogic Meson Graphic Controller") Cc: Neil Armstrong <[email protected]> Cc: Maxime Ripard <[email protected]> Cc: Carlo Caione <[email protected]> Cc: Kevin Hilman <[email protected]> Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: <[email protected]> # v4.10+ Acked-by: Neil Armstrong <[email protected]> Signed-off-by: Neil Armstrong <[email protected]> Link: https://patchwork.freedesktop.org/patch/msgid/[email protected] Signed-off-by: Sean Paul <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>

commit 46cc0b4 upstream. Current snapshot implementation swaps two ring_buffers even though their sizes are different from each other, that can cause an inconsistency between the contents of buffer_size_kb file and the current buffer size. For example: # cat buffer_size_kb 7 (expanded: 1408) # echo 1 > events/enable # grep bytes per_cpu/cpu0/stats bytes: 1441020 # echo 1 > snapshot // current:1408, spare:1408 # echo 123 > buffer_size_kb // current:123, spare:1408 # echo 1 > snapshot // current:1408, spare:123 # grep bytes per_cpu/cpu0/stats bytes: 1443700 # cat buffer_size_kb 123 // != current:1408 And also, a similar per-cpu case hits the following WARNING: Reproducer: # echo 1 > per_cpu/cpu0/snapshot # echo 123 > buffer_size_kb # echo 1 > per_cpu/cpu0/snapshot WARNING: WARNING: CPU: 0 PID: 1946 at kernel/trace/trace.c:1607 update_max_tr_single.part.0+0x2b8/0x380 Modules linked in: CPU: 0 PID: 1946 Comm: bash Not tainted 5.2.0-rc6 #20 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-2.fc30 04/01/2014 RIP: 0010:update_max_tr_single.part.0+0x2b8/0x380 Code: ff e8 dc da f9 ff 0f 0b e9 88 fe ff ff e8 d0 da f9 ff 44 89 ee bf f5 ff ff ff e8 33 dc f9 ff 41 83 fd f5 74 96 e8 b8 da f9 ff <0f> 0b eb 8d e8 af da f9 ff 0f 0b e9 bf fd ff ff e8 a3 da f9 ff 48 RSP: 0018:ffff888063e4fca0 EFLAGS: 00010093 RAX: ffff888066214380 RBX: ffffffff99850fe0 RCX: ffffffff964298a8 RDX: 0000000000000000 RSI: 00000000fffffff5 RDI: 0000000000000005 RBP: 1ffff1100c7c9f96 R08: ffff888066214380 R09: ffffed100c7c9f9b R10: ffffed100c7c9f9a R11: 0000000000000003 R12: 0000000000000000 R13: 00000000ffffffea R14: ffff888066214380 R15: ffffffff99851060 FS: 00007f9f8173c700(0000) GS:ffff88806d000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000714dc0 CR3: 0000000066fa6000 CR4: 00000000000006f0 Call Trace: ? trace_array_printk_buf+0x140/0x140 ? __mutex_lock_slowpath+0x10/0x10 tracing_snapshot_write+0x4c8/0x7f0 ? trace_printk_init_buffers+0x60/0x60 ? selinux_file_permission+0x3b/0x540 ? tracer_preempt_off+0x38/0x506 ? trace_printk_init_buffers+0x60/0x60 __vfs_write+0x81/0x100 vfs_write+0x1e1/0x560 ksys_write+0x126/0x250 ? __ia32_sys_read+0xb0/0xb0 ? do_syscall_64+0x1f/0x390 do_syscall_64+0xc1/0x390 entry_SYSCALL_64_after_hwframe+0x49/0xbe This patch adds resize_buffer_duplicate_size() to check if there is a difference between current/spare buffer sizes and resize a spare buffer if necessary. Link: http://lkml.kernel.org/r/[email protected] Cc: [email protected] Fixes: ad909e2 ("tracing: Add internal tracing_snapshot() functions") Signed-off-by: Eiichi Tsukata <[email protected]> Signed-off-by: Steven Rostedt (VMware) <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>

commit f9c6456 upstream. Masoud Sharbiani noticed that commit 29ef680 ("memcg, oom: move out_of_memory back to the charge path") broke memcg OOM called from __xfs_filemap_fault() path. It turned out that try_charge() is retrying forever without making forward progress because mem_cgroup_oom(GFP_NOFS) cannot invoke the OOM killer due to commit 3da88fb ("mm, oom: move GFP_NOFS check to out_of_memory"). Allowing forced charge due to being unable to invoke memcg OOM killer will lead to global OOM situation. Also, just returning -ENOMEM will be risky because OOM path is lost and some paths (e.g. get_user_pages()) will leak -ENOMEM. Therefore, invoking memcg OOM killer (despite GFP_NOFS) will be the only choice we can choose for now. Until 29ef680, we were able to invoke memcg OOM killer when GFP_KERNEL reclaim failed [1]. But since 29ef680, we need to invoke memcg OOM killer when GFP_NOFS reclaim failed [2]. Although in the past we did invoke memcg OOM killer for GFP_NOFS [3], we might get pre-mature memcg OOM reports due to this patch. [1] leaker invoked oom-killer: gfp_mask=0x6200ca(GFP_HIGHUSER_MOVABLE), nodemask=(null), order=0, oom_score_adj=0 CPU: 0 PID: 2746 Comm: leaker Not tainted 4.18.0+ #19 Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 04/13/2018 Call Trace: dump_stack+0x63/0x88 dump_header+0x67/0x27a ? mem_cgroup_scan_tasks+0x91/0xf0 oom_kill_process+0x210/0x410 out_of_memory+0x10a/0x2c0 mem_cgroup_out_of_memory+0x46/0x80 mem_cgroup_oom_synchronize+0x2e4/0x310 ? high_work_func+0x20/0x20 pagefault_out_of_memory+0x31/0x76 mm_fault_error+0x55/0x115 ? handle_mm_fault+0xfd/0x220 __do_page_fault+0x433/0x4e0 do_page_fault+0x22/0x30 ? page_fault+0x8/0x30 page_fault+0x1e/0x30 RIP: 0033:0x4009f0 Code: 03 00 00 00 e8 71 fd ff ff 48 83 f8 ff 49 89 c6 74 74 48 89 c6 bf c0 0c 40 00 31 c0 e8 69 fd ff ff 45 85 ff 7e 21 31 c9 66 90 <41> 0f be 14 0e 01 d3 f7 c1 ff 0f 00 00 75 05 41 c6 04 0e 2a 48 83 RSP: 002b:00007ffe29ae96f0 EFLAGS: 00010206 RAX: 000000000000001b RBX: 0000000000000000 RCX: 0000000001ce1000 RDX: 0000000000000000 RSI: 000000007fffffe5 RDI: 0000000000000000 RBP: 000000000000000c R08: 0000000000000000 R09: 00007f94be09220d R10: 0000000000000002 R11: 0000000000000246 R12: 00000000000186a0 R13: 0000000000000003 R14: 00007f949d845000 R15: 0000000002800000 Task in /leaker killed as a result of limit of /leaker memory: usage 524288kB, limit 524288kB, failcnt 158965 memory+swap: usage 0kB, limit 9007199254740988kB, failcnt 0 kmem: usage 2016kB, limit 9007199254740988kB, failcnt 0 Memory cgroup stats for /leaker: cache:844KB rss:521136KB rss_huge:0KB shmem:0KB mapped_file:0KB dirty:132KB writeback:0KB inactive_anon:0KB active_anon:521224KB inactive_file:1012KB active_file:8KB unevictable:0KB Memory cgroup out of memory: Kill process 2746 (leaker) score 998 or sacrifice child Killed process 2746 (leaker) total-vm:536704kB, anon-rss:521176kB, file-rss:1208kB, shmem-rss:0kB oom_reaper: reaped process 2746 (leaker), now anon-rss:0kB, file-rss:0kB, shmem-rss:0kB [2] leaker invoked oom-killer: gfp_mask=0x600040(GFP_NOFS), nodemask=(null), order=0, oom_score_adj=0 CPU: 1 PID: 2746 Comm: leaker Not tainted 4.18.0+ #20 Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 04/13/2018 Call Trace: dump_stack+0x63/0x88 dump_header+0x67/0x27a ? mem_cgroup_scan_tasks+0x91/0xf0 oom_kill_process+0x210/0x410 out_of_memory+0x109/0x2d0 mem_cgroup_out_of_memory+0x46/0x80 try_charge+0x58d/0x650 ? __radix_tree_replace+0x81/0x100 mem_cgroup_try_charge+0x7a/0x100 __add_to_page_cache_locked+0x92/0x180 add_to_page_cache_lru+0x4d/0xf0 iomap_readpages_actor+0xde/0x1b0 ? iomap_zero_range_actor+0x1d0/0x1d0 iomap_apply+0xaf/0x130 iomap_readpages+0x9f/0x150 ? iomap_zero_range_actor+0x1d0/0x1d0 xfs_vm_readpages+0x18/0x20 [xfs] read_pages+0x60/0x140 __do_page_cache_readahead+0x193/0x1b0 ondemand_readahead+0x16d/0x2c0 page_cache_async_readahead+0x9a/0xd0 filemap_fault+0x403/0x620 ? alloc_set_pte+0x12c/0x540 ? _cond_resched+0x14/0x30 __xfs_filemap_fault+0x66/0x180 [xfs] xfs_filemap_fault+0x27/0x30 [xfs] __do_fault+0x19/0x40 __handle_mm_fault+0x8e8/0xb60 handle_mm_fault+0xfd/0x220 __do_page_fault+0x238/0x4e0 do_page_fault+0x22/0x30 ? page_fault+0x8/0x30 page_fault+0x1e/0x30 RIP: 0033:0x4009f0 Code: 03 00 00 00 e8 71 fd ff ff 48 83 f8 ff 49 89 c6 74 74 48 89 c6 bf c0 0c 40 00 31 c0 e8 69 fd ff ff 45 85 ff 7e 21 31 c9 66 90 <41> 0f be 14 0e 01 d3 f7 c1 ff 0f 00 00 75 05 41 c6 04 0e 2a 48 83 RSP: 002b:00007ffda45c9290 EFLAGS: 00010206 RAX: 000000000000001b RBX: 0000000000000000 RCX: 0000000001a1e000 RDX: 0000000000000000 RSI: 000000007fffffe5 RDI: 0000000000000000 RBP: 000000000000000c R08: 0000000000000000 R09: 00007f6d061ff20d R10: 0000000000000002 R11: 0000000000000246 R12: 00000000000186a0 R13: 0000000000000003 R14: 00007f6ce59b2000 R15: 0000000002800000 Task in /leaker killed as a result of limit of /leaker memory: usage 524288kB, limit 524288kB, failcnt 7221 memory+swap: usage 0kB, limit 9007199254740988kB, failcnt 0 kmem: usage 1944kB, limit 9007199254740988kB, failcnt 0 Memory cgroup stats for /leaker: cache:3632KB rss:518232KB rss_huge:0KB shmem:0KB mapped_file:0KB dirty:0KB writeback:0KB inactive_anon:0KB active_anon:518408KB inactive_file:3908KB active_file:12KB unevictable:0KB Memory cgroup out of memory: Kill process 2746 (leaker) score 992 or sacrifice child Killed process 2746 (leaker) total-vm:536704kB, anon-rss:518264kB, file-rss:1188kB, shmem-rss:0kB oom_reaper: reaped process 2746 (leaker), now anon-rss:0kB, file-rss:0kB, shmem-rss:0kB [3] leaker invoked oom-killer: gfp_mask=0x50, order=0, oom_score_adj=0 leaker cpuset=/ mems_allowed=0 CPU: 1 PID: 3206 Comm: leaker Not tainted 3.10.0-957.27.2.el7.x86_64 #1 Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 04/13/2018 Call Trace: [<ffffffffaf364147>] dump_stack+0x19/0x1b [<ffffffffaf35eb6a>] dump_header+0x90/0x229 [<ffffffffaedbb456>] ? find_lock_task_mm+0x56/0xc0 [<ffffffffaee32a38>] ? try_get_mem_cgroup_from_mm+0x28/0x60 [<ffffffffaedbb904>] oom_kill_process+0x254/0x3d0 [<ffffffffaee36c36>] mem_cgroup_oom_synchronize+0x546/0x570 [<ffffffffaee360b0>] ? mem_cgroup_charge_common+0xc0/0xc0 [<ffffffffaedbc194>] pagefault_out_of_memory+0x14/0x90 [<ffffffffaf35d072>] mm_fault_error+0x6a/0x157 [<ffffffffaf3717c8>] __do_page_fault+0x3c8/0x4f0 [<ffffffffaf371925>] do_page_fault+0x35/0x90 [<ffffffffaf36d768>] page_fault+0x28/0x30 Task in /leaker killed as a result of limit of /leaker memory: usage 524288kB, limit 524288kB, failcnt 20628 memory+swap: usage 524288kB, limit 9007199254740988kB, failcnt 0 kmem: usage 0kB, limit 9007199254740988kB, failcnt 0 Memory cgroup stats for /leaker: cache:840KB rss:523448KB rss_huge:0KB mapped_file:0KB swap:0KB inactive_anon:0KB active_anon:523448KB inactive_file:464KB active_file:376KB unevictable:0KB Memory cgroup out of memory: Kill process 3206 (leaker) score 970 or sacrifice child Killed process 3206 (leaker) total-vm:536692kB, anon-rss:523304kB, file-rss:412kB, shmem-rss:0kB Bisected by Masoud Sharbiani. Link: http://lkml.kernel.org/r/[email protected] Fixes: 3da88fb ("mm, oom: move GFP_NOFS check to out_of_memory") [necessary after 29ef680] Signed-off-by: Tetsuo Handa <[email protected]> Reported-by: Masoud Sharbiani <[email protected]> Tested-by: Masoud Sharbiani <[email protected]> Acked-by: Michal Hocko <[email protected]> Cc: David Rientjes <[email protected]> Cc: <[email protected]> [4.19+] Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>

vcaputo merged commit 8868fad into coreos:v4.7-coreos Aug 3, 2016

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vfs: fix deadlock in file_remove_privs() on overlayfs #20

vfs: fix deadlock in file_remove_privs() on overlayfs #20

vcaputo commented Aug 3, 2016

vcaputo commented Aug 3, 2016

mischief commented Aug 3, 2016

vfs: fix deadlock in file_remove_privs() on overlayfs #20

vfs: fix deadlock in file_remove_privs() on overlayfs #20

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vcaputo commented Aug 3, 2016

vcaputo commented Aug 3, 2016

mischief commented Aug 3, 2016