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Date: Mon, 16 Sep 2013 22:13:10 -0700 From: Dmitry Vyukov <dvyukov@...gle.com> To: yoshfuji@...ux-ipv6.org, hannes@...essinduktion.org, netdev@...r.kernel.org, Paul Turner <pjt@...gle.com>, Andrey Konovalov <andreyknvl@...gle.com>, Kostya Serebryany <kcc@...gle.com>, Tom Herbert <therbert@...gle.com> Subject: Potential out-of-bounds access in ip6_finish_output2 Hi, I am working on AddressSanitizer -- a tool that detects use-after-free and out-of-bounds bugs (https://code.google.com/p/address-sanitizer/wiki/AddressSanitizerForKernel). I've got a dozen of reports in ip6_finish_output2. Below are 2 of them. They are always followed by kernel crash. Unfortunately I don't have a reproducer because I am using trinity fuzzer. I would appreciate if somebody familiar with the code look at sources and maybe spot the bug. The reports are obtained on revision 6a7492a4b2e05051a44458d7187023e22d580666. [ 977.765485] ERROR: AddressSanitizer: heap-buffer-overflow on address ffff8800521e8730 [ 977.767205] ffff8800521e8730 is located 16 bytes to the left of 512-byte region [ffff8800521e8740, ffff8800521e8940) [ 977.769399] Accessed by thread T11464: [ 977.770274] #0 ffffffff810dd2a6 (asan_report_error+0x306/0x410) [ 977.771570] #1 ffffffff810dc6a0 (asan_check_region+0x30/0x40) [ 977.772883] #2 ffffffff810dc9ff (asan_memcpy+0x1f/0x60) [ 977.774033] #3 ffffffffa0003b1c (ip6_finish_output2+0x54c/0x840 [ipv6]) [ 977.775451] #4 ffffffffa00088dc (ip6_fragment+0xe2c/0x1520 [ipv6]) [ 977.776710] #5 ffffffffa00090f7 (ip6_finish_output+0x127/0x190 [ipv6]) [ 977.777649] #6 ffffffffa00091e1 (ip6_output+0x81/0x140 [ipv6]) [ 977.778503] #7 ffffffffa000630c (ip6_local_out+0x4c/0x60 [ipv6]) [ 977.779379] #8 ffffffffa0006afd (ip6_push_pending_frames+0x7dd/0xac0 [ipv6]) [ 977.780391] #9 ffffffffa00319de (rawv6_sendmsg+0x12ae/0x15c0 [ipv6]) [ 977.781295] #10 ffffffff818bb498 (inet_sendmsg+0x108/0x160) [ 977.782094] #11 ffffffff817d0016 (sock_aio_write+0x296/0x2e0) [ 977.782885] #12 ffffffff8129dcb1 (do_sync_write+0x111/0x170) [ 977.783699] #13 ffffffff8129e9fd (vfs_write+0x2dd/0x300) [ 977.784468] #14 ffffffff8129f9a0 (SyS_write+0x80/0xe0) [ 977.785214] #15 ffffffff81928582 (system_call_fastpath+0x16/0x1b) [ 977.786066] [ 977.786284] Allocated by thread T11464: [ 977.786858] #0 ffffffff810dc768 (asan_slab_alloc+0x48/0xc0) [ 977.787661] #1 ffffffff81283d89 (kmem_cache_alloc_node_trace+0x99/0x4f0) [ 977.788860] #2 ffffffff81284211 (__kmalloc_node_track_caller+0x31/0x40) [ 977.790359] #3 ffffffff817ded6a (__kmalloc_reserve.isra.27+0x4a/0xb0) [ 977.791800] #4 ffffffff817e0201 (__alloc_skb+0x91/0x280) [ 977.792985] #5 ffffffff817d807a (sock_wmalloc+0x6a/0xe0) [ 977.794183] #6 ffffffffa0005ea6 (ip6_append_data+0x1906/0x1c20 [ipv6]) [ 977.795597] #7 ffffffffa0030dd7 (rawv6_sendmsg+0x6a7/0x15c0 [ipv6]) [ 977.796831] #8 ffffffff818bb498 (inet_sendmsg+0x108/0x160) [ 977.798035] #9 ffffffff817d0016 (sock_aio_write+0x296/0x2e0) [ 977.799260] #10 ffffffff8129dcb1 (do_sync_write+0x111/0x170) [ 977.800495] #11 ffffffff8129e9fd (vfs_write+0x2dd/0x300) [ 977.801709] #12 ffffffff8129f9a0 (SyS_write+0x80/0xe0) [ 977.802882] #13 ffffffff81928582 (system_call_fastpath+0x16/0x1b) [ 977.804209] [ 977.804529] Shadow bytes around the buggy address: [ 977.805588] ffff8800521e8480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 977.807192] ffff8800521e8500: 00 00 00 00 00 00 00 fb fb fb fb fb fb fb fb fb [ 977.808655] ffff8800521e8580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 977.810122] ffff8800521e8600: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa [ 977.811776] ffff8800521e8680: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa [ 977.813128] =>ffff8800521e8700: fa fa fa fa fa fa[fa]fa 00 00 00 00 00 00 00 00 [ 977.814463] ffff8800521e8780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 977.815625] ffff8800521e8800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 977.816685] ffff8800521e8880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 977.817814] ffff8800521e8900: 00 00 00 00 00 00 00 00 fa fa fa fa fa fa fa fa [ 977.818907] ffff8800521e8980: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa [ 977.819917] Shadow byte legend (one shadow byte represents 8 application bytes): [ 977.820929] Addressable: 00 [ 977.821479] Partially addressable: 01 02 03 04 05 06 07 [ 977.822251] Heap redzone: fa [ 977.822841] Heap kmalloc redzone: fb [ 977.823414] Freed heap region: fd [ 977.823955] Shadow gap: fe [ 977.824512] ========================================================================= [ 977.825607] skbuff: skb_under_panic: text:ffffffffa0003b35 len:125 put:14 head:ffff8800521e8740 data:ffff8800521e8732 tail:0x6f end:0xc0 dev:lo [ 977.827336] ------------[ cut here ]------------ [ 977.828000] kernel BUG at net/core/skbuff.c:126! [ 977.828270] invalid opcode: 0000 [#1] SMP [ 977.828270] Modules linked in: snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device tun 8021q snd_pcm_oss snd_pcm snd_page_alloc snd_timer snd_mixer_oss snd sr_mod cdrom loop bridge stp llc st ipt_ULOG nfnetlink iptable_mangle tg3 ptp pps_core i2c_piix4 i2c_core msr cpuid e1000 ipv6 [ 977.828270] CPU: 1 PID: 11464 Comm: trinity-child28 Not tainted 3.11.0-smp-DEV #8 [ 977.828270] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2007 [ 977.828270] task: ffff880053321280 ti: ffff880049194000 task.ti: ffff880049194000 [ 977.828270] RIP: 0010:[<ffffffff81913878>] [<ffffffff81913878>] skb_panic+0xd5/0xd7 [ 977.828270] RSP: 0018:ffff8800491957a0 EFLAGS: 00010286 [ 977.828270] RAX: 0000000000000083 RBX: ffff8800485be6c0 RCX: 0000000000000000 [ 977.828270] RDX: ffff880000000000 RSI: 0000000000000008 RDI: ffffffff81c44cd8 [ 977.828270] RBP: ffff880049195808 R08: 000000000000006f R09: 0000000000000000 [ 977.828270] R10: 0000000000000000 R11: 0000000000000000 R12: ffff88005bf8b400 [ 977.828270] R13: ffff8800521e8732 R14: 000000000000006f R15: 00000000000000c0 [ 977.828270] FS: 0000000001642880(0063) GS:ffff88005fd00000(0000) knlGS:0000000000000000 [ 977.828270] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 977.828270] CR2: 0000000000000009 CR3: 0000000049eef000 CR4: 00000000000006e0 [ 977.828270] Stack: [ 977.828270] ffff8800521e8732 000000000000006f 00000000000000c0 ffff88005bf8b400 [ 977.828270] 0000000e485be6c0 ffffffffa0003b35 ffffffff81aa3940 ffff8800521e8740 [ 977.828270] ffff8800485be6c0 ffff8800521e8732 000000000000000e ffff8800485be720 [ 977.828270] Call Trace: [ 977.828270] [<ffffffffa0003b35>] ? ip6_finish_output2+0x565/0x840 [ipv6] [ 977.828270] [<ffffffff817ddb59>] skb_push+0xa9/0xb0 [ 977.828270] [<ffffffffa0003b35>] ip6_finish_output2+0x565/0x840 [ipv6] [ 977.828270] [<ffffffffa00088dc>] ip6_fragment+0xe2c/0x1520 [ipv6] [ 977.828270] [<ffffffffa00035d0>] ? ip6_flush_pending_frames+0x1d0/0x1d0 [ipv6] [ 977.828270] [<ffffffffa00090f7>] ip6_finish_output+0x127/0x190 [ipv6] [ 977.828270] [<ffffffffa00091e1>] ip6_output+0x81/0x140 [ipv6] [ 977.828270] [<ffffffffa000630c>] ip6_local_out+0x4c/0x60 [ipv6] [ 977.828270] [<ffffffff810dc689>] ? asan_check_region+0x19/0x40 [ 977.828270] [<ffffffffa0006afd>] ip6_push_pending_frames+0x7dd/0xac0 [ipv6] [ 977.828270] [<ffffffffa00319de>] rawv6_sendmsg+0x12ae/0x15c0 [ipv6] [ 977.828270] [<ffffffff810dc689>] ? asan_check_region+0x19/0x40 [ 977.828270] [<ffffffff818bb498>] inet_sendmsg+0x108/0x160 [ 977.828270] [<ffffffff817d0016>] sock_aio_write+0x296/0x2e0 [ 977.828270] [<ffffffff8129dcb1>] do_sync_write+0x111/0x170 [ 977.828270] [<ffffffff8129e9fd>] vfs_write+0x2dd/0x300 [ 977.828270] [<ffffffff8129f9a0>] SyS_write+0x80/0xe0 [ 977.828270] [<ffffffff81928582>] system_call_fastpath+0x16/0x1b [ 977.828270] Code: c7 f0 a2 ba 81 44 8b 45 bc 48 8b 55 c0 31 c0 48 8b 75 c8 4c 89 64 24 18 4c 89 7c 24 10 4c 89 74 24 08 4c 89 2c 24 e8 7d 73 ff ff <0f> 0b 55 48 89 e5 48 8b 7d 08 e8 39 9b 7c ff 0f 0b 55 48 89 e5 [ 977.828270] RIP [<ffffffff81913878>] skb_panic+0xd5/0xd7 [ 977.828270] RSP <ffff8800491957a0> [ 977.871681] ---[ end trace 20970757dd5daf11 ]--- [ 521.772929] ERROR: AddressSanitizer: heap-buffer-overflow on address ffff88004965fbe8 [ 521.774073] ffff88004965fbe8 is located 24 bytes to the left of 512-byte region [ffff88004965fc00, ffff88004965fe00) [ 521.775741] Accessed by thread T2167: [ 521.776475] #0 ffffffff810dd2a6 (asan_report_error+0x306/0x410) [ 521.777728] #1 ffffffff810dc6a0 (asan_check_region+0x30/0x40) [ 521.778966] #2 ffffffff810dc9ff (asan_memcpy+0x1f/0x60) [ 521.780145] #3 ffffffffa0003b1c (ip6_finish_output2+0x54c/0x840 [ipv6]) [ 521.781570] #4 ffffffffa00088dc (ip6_fragment+0xe2c/0x1520 [ipv6]) [ 521.782912] #5 ffffffffa00090f7 (ip6_finish_output+0x127/0x190 [ipv6]) [ 521.784032] #6 ffffffffa00091e1 (ip6_output+0x81/0x140 [ipv6]) [ 521.785157] #7 ffffffffa000630c (ip6_local_out+0x4c/0x60 [ipv6]) [ 521.786460] #8 ffffffffa0006afd (ip6_push_pending_frames+0x7dd/0xac0 [ipv6]) [ 521.787977] #9 ffffffffa00319de (rawv6_sendmsg+0x12ae/0x15c0 [ipv6]) [ 521.789366] #10 ffffffff818bb498 (inet_sendmsg+0x108/0x160) [ 521.790597] #11 ffffffff817d0016 (sock_aio_write+0x296/0x2e0) [ 521.791826] #12 ffffffff8129dcb1 (do_sync_write+0x111/0x170) [ 521.792975] #13 ffffffff8129e9fd (vfs_write+0x2dd/0x300) [ 521.793821] #14 ffffffff8129f9a0 (SyS_write+0x80/0xe0) [ 521.794684] #15 ffffffff81928582 (system_call_fastpath+0x16/0x1b) [ 521.795640] [ 521.795878] Allocated by thread T6026: [ 521.796474] #0 ffffffff810dc768 (asan_slab_alloc+0x48/0xc0) [ 521.797360] #1 ffffffff81283d89 (kmem_cache_alloc_node_trace+0x99/0x4f0) [ 521.798365] #2 ffffffff81284211 (__kmalloc_node_track_caller+0x31/0x40) [ 521.799406] #3 ffffffff817ded6a (__kmalloc_reserve.isra.27+0x4a/0xb0) [ 521.800436] #4 ffffffff817e0201 (__alloc_skb+0x91/0x280) [ 521.801328] #5 ffffffff817d807a (sock_wmalloc+0x6a/0xe0) [ 521.802170] #6 ffffffffa0005ea6 (ip6_append_data+0x1906/0x1c20 [ipv6]) [ 521.803073] #7 ffffffffa0030dd7 (rawv6_sendmsg+0x6a7/0x15c0 [ipv6]) [ 521.804068] #8 ffffffff818bb498 (inet_sendmsg+0x108/0x160) [ 521.804919] #9 ffffffff817d18e3 (sock_sendmsg+0x133/0x170) [ 521.805760] #10 ffffffff817d2009 (SYSC_sendto+0x1e9/0x2d0) [ 521.806618] #11 ffffffff817d2cc9 (SyS_sendto+0x49/0x70) [ 521.807598] #12 ffffffff81928582 (system_call_fastpath+0x16/0x1b) [ 521.808826] [ 521.809188] Shadow bytes around the buggy address: [ 521.810231] ffff88004965f900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 521.811752] ffff88004965f980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 521.813253] ffff88004965fa00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 521.814743] ffff88004965fa80: 00 00 00 00 00 00 00 00 fa fa fa fa fa fa fa fa [ 521.816052] ffff88004965fb00: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa [ 521.817113] =>ffff88004965fb80: fa fa fa fa fa fa fa fa fa fa fa fa fa[fa]fa fa [ 521.818149] ffff88004965fc00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 521.819224] ffff88004965fc80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 521.820280] ffff88004965fd00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 521.821357] ffff88004965fd80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 521.822398] ffff88004965fe00: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa [ 521.823392] Shadow byte legend (one shadow byte represents 8 application bytes): [ 521.824388] Addressable: 00 [ 521.824901] Partially addressable: 01 02 03 04 05 06 07 [ 521.825667] Heap redzone: fa [ 521.826260] Heap kmalloc redzone: fb [ 521.826802] Freed heap region: fd [ 521.827347] Shadow gap: fe [ 521.827884] ========================================================================= [ 521.828976] skbuff: skb_under_panic: text:ffffffffa0003b35 len:133 put:14 head:ffff88004965fc00 data:ffff88004965fbea tail:0x6f end:0xc0 dev:lo [ 521.830736] ------------[ cut here ]------------ [ 521.831372] kernel BUG at net/core/skbuff.c:126! Dec 31 18[:5 4: 035 21.831680] invalid opcode: 0000 [#1] SMP [ 521.831680] Modules linked in: snd_mixer_oss snd sr_mod cdrom loop tun 8021qasa n3b krerinedl:g [e 5s21t.8p28976] slkblc st ipt_ULOG nfnetlink iptable_mangle tg3 ptp pps_core i2c_piix4 i2c_core msr cpuid e1000 ipv6 [ 521.831680] CPU: 1 PID: 2167 Comm: trinity-child52 Not tainted 3.11.0-smp-DEV #8 [ 521.831680] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2007 uff:[ s kb _u5nd2er1_p.831680] task: ffff88004b720be0 ti: ffff88004fc54000 task.ti: ffff88004fc54000 [ 521.831680] RIP: 0010:[<ffffffff81913878>] anic : [te<xtf:ffffffffffff81913878>] skb_panic+0xd5/0xd7 [ 521.831680] RSP: 0018:ffff88004fc557a0 EFLAGS: 00010286 fffa[00 03 b355 2le1n:.831680] RAX: 0000000000000083 RBX: ffff88004a919d80 RCX: 0000000000000000 [ 521.831680] RDX: ffff880000000000 RSI: 0000000000000008 RDI: ffffffff81c44cd8 133 [pu t: 145 h2ea1d:.831680] RBP: ffff88004fc55808 R08: 000000000000006f R09: 0000000000000000 [fff f8 8050429615f.c08031680] R10: 0000000000000000 R11: 0000000007f70a60 R12: ffff88005bf89400 [ 521.831680] R13: ffff88004965fbea R14: 000000000000006f R15: 00000000000000c0 d[at a: ff5ff8280104.9831680] FS: 0000000001a48880(0063) GS:ffff88005fd00000(0000) knlGS:0000000000000000 [ 521.831680] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 521.831680] CR2: 0000000000000000 CR3: 0000000013404000 CR4: 00000000000006e0 65fbe[a ta il52:01x.6f831680] Stack: [ 521.831680] ffff88004965fbea 000000000000006f en d:00x0c00 d0ev0:l0o00000000c0 ffff88005bf89400 [ 521.831680] 0000000e4a919d80 ffffffffa0003b35 ffffffff81aa3940 ffff88004965fc00 [ 521.831680] ffff88004a919d80 ffff88004965fbea 000000000000000e ffff88004a919de0 [ 521.831680] Call Trace: [ 521.831680] [<ffffffffa0003b35>] ? ip6_finish_output2+0x565/0x840 [ipv6] [ 521.831680] [<ffffffff817ddb59>] skb_push+0xa9/0xb0 [ 521.831680] [<ffffffffa0003b35>] ip6_finish_output2+0x565/0x840 [ipv6] [ 521.831680] [<ffffffffa00088dc>] ip6_fragment+0xe2c/0x1520 [ipv6] [ 521.831680] [<ffffffffa00035d0>] ? ip6_flush_pending_frames+0x1d0/0x1d0 [ipv6] [ 521.831680] [<ffffffff810dcd19>] ? asan_region_is_poisoned+0x89/0x1a0 [ 521.831680] [<ffffffffa00090f7>] ip6_finish_output+0x127/0x190 [ipv6] [ 521.831680] [<ffffffffa00091e1>] ip6_output+0x81/0x140 [ipv6] [ 521.831680] [<ffffffffa000630c>] ip6_local_out+0x4c/0x60 [ipv6] [ 521.831680] [<ffffffff810dc689>] ? asan_check_region+0x19/0x40 [ 521.831680] [<ffffffffa0006afd>] ip6_push_pending_frames+0x7dd/0xac0 [ipv6] [ 521.831680] [<ffffffffa00319de>] rawv6_sendmsg+0x12ae/0x15c0 [ipv6] [ 521.831680] [<ffffffff810dc689>] ? asan_check_region+0x19/0x40 [ 521.831680] [<ffffffff818bb498>] inet_sendmsg+0x108/0x160 [ 521.831680] [<ffffffff817d0016>] sock_aio_write+0x296/0x2e0 [ 521.831680] [<ffffffff8129dcb1>] do_sync_write+0x111/0x170 [ 521.831680] [<ffffffff8129e9fd>] vfs_write+0x2dd/0x300 [ 521.831680] [<ffffffff8129f9a0>] SyS_write+0x80/0xe0 [ 521.831680] [<ffffffff81928582>] system_call_fastpath+0x16/0x1b [ 521.831680] Code: c7 f0 a2 ba 81 44 8b 45 bc 48 8b 55 c0 31 c0 48 8b 75 c8 4c 89 64 24 18 4c 89 7c 24 10 4c 89 74 24 08 4c 89 2c 24 e8 7d 73 ff ff <0f> 0b 55 48 89 e5 48 8b 7d 08 e8 39 9b 7c ff 0f 0b 55 48 89 e5 [ 521.831680] RIP [<ffffffff81913878>] skb_panic+0xd5/0xd7 [ 521.831680] RSP <ffff88004fc557a0> [ 521.876810] ---[ end trace 4037fd48810bceeb ]--- -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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