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Date: Thu, 5 Nov 2015 20:36:30 +0100 From: Dmitry Vyukov <dvyukov@...gle.com> To: Eric Dumazet <edumazet@...gle.com>, Pablo Neira Ayuso <pablo@...filter.org>, Patrick McHardy <kaber@...sh.net>, Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>, David Miller <davem@...emloft.net>, Alexey Kuznetsov <kuznet@....inr.ac.ru>, James Morris <jmorris@...ei.org>, Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>, Sasha Levin <sasha.levin@...cle.com>, Kees Cook <keescook@...gle.com>, Julien Tinnes <jln@...gle.com>, Kostya Serebryany <kcc@...gle.com>, Alexander Potapenko <glider@...gle.com>, netdev <netdev@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>, syzkaller <syzkaller@...glegroups.com> Subject: Use-after-free in selinux_ip_postroute_compat Hello, I've updated from bcee19f424a0d8c26ecf2607b73c690802658b29 (Sep 21) to 8e483ed1342a4ea45b70f0f33ac54eff7a33d918 (Nov 4) and start seeing the following use-after-free reports: BUG: KASan: use after free in selinux_ip_postroute_compat+0x2af/0x2d0 at addr ffff88003dbdc148 Read of size 8 by task swapper/1/0 ============================================================================= BUG kmalloc-512 (Tainted: G B ): kasan: bad access detected ----------------------------------------------------------------------------- CPU: 1 PID: 0 Comm: swapper/1 Tainted: G B 4.3.0+ #29 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 00000000ffffffff ffff88003ed06970 ffffffff81aab806 ffff88003e804b40 ffff88003dbdc000 ffff88003dbdc000 ffff88003ed069a0 ffffffff814a4b34 ffff88003e804b40 ffffea0000f6f700 ffff88003dbdc000 ffff88003ed06bd0 Call Trace: <IRQ> [< inline >] __dump_stack lib/dump_stack.c:15 <IRQ> [<ffffffff81aab806>] dump_stack+0x68/0x92 lib/dump_stack.c:50 [<ffffffff814a4b34>] print_trailer+0xf4/0x150 mm/slub.c:650 [<ffffffff814aa44f>] object_err+0x2f/0x40 mm/slub.c:657 [< inline >] print_address_description mm/kasan/report.c:120 [<ffffffff814ac976>] kasan_report_error+0x1d6/0x3c0 mm/kasan/report.c:193 [< inline >] kasan_report mm/kasan/report.c:230 [<ffffffff814acc5e>] __asan_report_load8_noabort+0x3e/0x40 mm/kasan/report.c:251 [<ffffffff819614cf>] selinux_ip_postroute_compat+0x2af/0x2d0 security/selinux/hooks.c:4947 [<ffffffff819619af>] selinux_ip_postroute+0x4bf/0xb70 security/selinux/hooks.c:4986 [<ffffffff819620ee>] selinux_ipv4_postroute+0x3e/0x50 security/selinux/hooks.c:5110 [<ffffffff8287918d>] nf_iterate+0x15d/0x250 net/netfilter/core.c:274 [<ffffffff82879421>] nf_hook_slow+0x1a1/0x300 net/netfilter/core.c:306 [< inline >] nf_hook_thresh include/linux/netfilter.h:187 [< inline >] NF_HOOK_COND include/linux/netfilter.h:238 [<ffffffff829072c5>] ip_output+0x2b5/0x460 net/ipv4/ip_output.c:358 [< inline >] dst_output include/net/dst.h:459 [<ffffffff82904528>] ip_local_out+0xd8/0x1c0 net/ipv4/ip_output.c:116 [<ffffffff82904bb6>] ip_build_and_send_pkt+0x5a6/0xa40 net/ipv4/ip_output.c:171 [<ffffffff8299183d>] tcp_v4_send_synack+0x18d/0x270 net/ipv4/tcp_ipv4.c:841 [<ffffffff8294beeb>] tcp_conn_request+0x1f3b/0x2750 net/ipv4/tcp_input.c:6273 [<ffffffff8298b4be>] tcp_v4_conn_request+0x17e/0x240 net/ipv4/tcp_ipv4.c:1234 [<ffffffff8296012e>] tcp_rcv_state_process+0x6ae/0x4130 net/ipv4/tcp_input.c:5750 [<ffffffff8298f7db>] tcp_v4_do_rcv+0x2fb/0x9f0 net/ipv4/tcp_ipv4.c:1405 [<ffffffff82994952>] tcp_v4_rcv+0x2872/0x2f80 net/ipv4/tcp_ipv4.c:1630 [<ffffffff828eb0c9>] ip_local_deliver_finish+0x2a9/0xa30 net/ipv4/ip_input.c:216 [< inline >] NF_HOOK_THRESH include/linux/netfilter.h:226 [< inline >] NF_HOOK include/linux/netfilter.h:249 [<ffffffff828ed124>] ip_local_deliver+0x1c4/0x2f0 net/ipv4/ip_input.c:257 [< inline >] dst_input include/net/dst.h:465 [<ffffffff828ebe64>] ip_rcv_finish+0x614/0x11d0 net/ipv4/ip_input.c:365 [< inline >] NF_HOOK_THRESH include/linux/netfilter.h:226 [< inline >] NF_HOOK include/linux/netfilter.h:249 [<ffffffff828edcc6>] ip_rcv+0xa76/0x1470 net/ipv4/ip_input.c:455 [<ffffffff827c50d9>] __netif_receive_skb_core+0x1cb9/0x38e0 net/core/dev.c:3940 [<ffffffff827c6d2a>] __netif_receive_skb+0x2a/0x160 net/core/dev.c:3975 [<ffffffff827c9405>] netif_receive_skb_internal+0xe5/0x360 net/core/dev.c:4003 [< inline >] napi_skb_finish net/core/dev.c:4328 [<ffffffff827cd9d0>] napi_gro_receive+0x1c0/0x260 net/core/dev.c:4357 [< inline >] e1000_receive_skb drivers/net/ethernet/intel/e1000/e1000_main.c:4007 [<ffffffff8232012c>] e1000_clean_rx_irq+0x4ec/0x10c0 drivers/net/ethernet/intel/e1000/e1000_main.c:4459 [<ffffffff8231dd46>] e1000_clean+0xa56/0x2520 drivers/net/ethernet/intel/e1000/e1000_main.c:3814 [< inline >] napi_poll net/core/dev.c:4793 [<ffffffff827ca73d>] net_rx_action+0x74d/0xc70 net/core/dev.c:4858 [<ffffffff8110fdae>] __do_softirq+0x2ae/0x710 kernel/softirq.c:273 [< inline >] invoke_softirq kernel/softirq.c:350 [<ffffffff811104ad>] irq_exit+0x15d/0x190 kernel/softirq.c:391 [< inline >] exiting_irq ./arch/x86/include/asm/apic.h:653 [<ffffffff81013256>] do_IRQ+0x86/0x1a0 arch/x86/kernel/irq.c:252 [<ffffffff82f23387>] common_interrupt+0x87/0x87 arch/x86/entry/entry_64.S:545 <EOI> [<ffffffff810d0706>] ? native_safe_halt+0x6/0x10 ./arch/x86/include/asm/irqflags.h:49 [< inline >] arch_safe_halt ./arch/x86/include/asm/paravirt.h:111 [<ffffffff81026e42>] default_idle+0x22/0x1e0 arch/x86/kernel/process.c:304 [<ffffffff81027f7a>] arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:295 [<ffffffff811d9b98>] default_idle_call+0x48/0x70 kernel/sched/idle.c:92 [< inline >] cpuidle_idle_call kernel/sched/idle.c:156 [< inline >] cpu_idle_loop kernel/sched/idle.c:251 [<ffffffff811da0bd>] cpu_startup_entry+0x41d/0x570 kernel/sched/idle.c:299 [<ffffffff810ac8b3>] start_secondary+0x243/0x2d0 arch/x86/kernel/smpboot.c:251 INFO: Allocated in __alloc_skb+0xf0/0x5f0 age=20059 cpu=1 pid=1248 [< none >] __slab_alloc+0x23a/0x560 mm/slub.c:2402 [< inline >] slab_alloc_node mm/slub.c:2470 [< none >] __kmalloc_node_track_caller+0xa4/0x230 mm/slub.c:3956 [< none >] __kmalloc_reserve.isra.33+0x41/0xe0 net/core/skbuff.c:135 [< none >] __alloc_skb+0xf0/0x5f0 net/core/skbuff.c:228 [< inline >] alloc_skb include/linux/skbuff.h:814 [< none >] kobject_uevent_env+0x5b0/0xbc0 lib/kobject_uevent.c:300 [< none >] kobject_uevent+0x1f/0x30 lib/kobject_uevent.c:374 [< none >] uevent_store+0xc9/0xd0 drivers/base/bus.c:655 [< none >] dev_attr_store+0x5c/0x90 drivers/base/core.c:137 [< none >] sysfs_kf_write+0x121/0x180 fs/sysfs/file.c:133 [< none >] kernfs_fop_write+0x2b0/0x3f0 fs/kernfs/file.c:312 [< none >] __vfs_write+0x10e/0x3d0 fs/read_write.c:489 [< none >] vfs_write+0x16e/0x490 fs/read_write.c:538 [< inline >] SYSC_write fs/read_write.c:585 [< none >] SyS_write+0x111/0x220 fs/read_write.c:577 [< none >] entry_SYSCALL_64_fastpath+0x31/0x9a arch/x86/entry/entry_64.S:187 INFO: Freed in skb_release_data+0x300/0x3c0 age=19765 cpu=2 pid=1219 [< none >] __slab_free+0x1ec/0x350 mm/slub.c:2587 (discriminator 1) [< inline >] slab_free mm/slub.c:2736 [< none >] kfree+0x1ab/0x1c0 mm/slub.c:3522 [< inline >] skb_free_head net/core/skbuff.c:569 [< none >] skb_release_data+0x300/0x3c0 net/core/skbuff.c:600 [< none >] skb_release_all+0x4a/0x60 net/core/skbuff.c:659 [< inline >] __kfree_skb net/core/skbuff.c:673 [< none >] consume_skb+0xb1/0x1e0 net/core/skbuff.c:746 [< none >] skb_free_datagram+0x1a/0xe0 net/core/datagram.c:280 [< none >] netlink_recvmsg+0x536/0xd20 net/netlink/af_netlink.c:2590 [< inline >] sock_recvmsg_nosec net/socket.c:712 [< none >] sock_recvmsg+0x9d/0xb0 net/socket.c:720 [< none >] ___sys_recvmsg+0x259/0x540 net/socket.c:2104 [< none >] __sys_recvmsg+0xce/0x170 net/socket.c:2150 [< inline >] SYSC_recvmsg net/socket.c:2162 [< none >] SyS_recvmsg+0x2d/0x50 net/socket.c:2157 [< none >] entry_SYSCALL_64_fastpath+0x31/0x9a arch/x86/entry/entry_64.S:187 INFO: Slab 0xffffea0000f6f700 objects=19 used=0 fp=0xffff88003dbdf0c0 flags=0x100000000004080 INFO: Object 0xffff88003dbdc000 @offset=0 fp=0xffff88003dbdc340 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the 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