1 TITLE: KASAN: wild-memory-access in sg_read 2 CORRUPTED: Y 3 4 [ 56.874510] ================================================================== 5 [ 56.881919] BUG: KASAN: wild-memory-access in sg_read+0x1296/0x1440 6 [ 56.886161] kasan: CONFIG_KASAN_INLINE enabled 7 [ 56.886164] kasan: GPF could be caused by NULL-ptr deref or user memory access 8 [ 56.886173] general protection fault: 0000 [#1] PREEMPT SMP KASAN 9 [ 56.886178] Dumping ftrace buffer: 10 [ 56.886182] (ftrace buffer empty) 11 [ 56.886186] Modules linked in: 12 [ 56.886194] CPU: 1 PID: 11774 Comm: syz-executor7 Not tainted 4.9.72-gcb7518e #10 13 [ 56.886198] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 14 [ 56.886203] task: ffff8801c45f9800 task.stack: ffff8801c5770000 15 [ 56.886222] RIP: 0010:[<ffffffff8144d081>] [<ffffffff8144d081>] __free_pages+0x21/0x80 16 [ 56.886226] RSP: 0018:ffff8801c5777940 EFLAGS: 00010a07 17 [ 56.886230] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82664f9b 18 [ 56.886234] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c 19 [ 56.886238] RBP: ffff8801c5777950 R08: 0000000000000001 R09: 0000000000000001 20 [ 56.886241] R10: 0000000000000000 R11: ffff8801c45f9800 R12: 0000000000000004 21 [ 56.886245] R13: 0000000000000020 R14: ffff8801cc62c200 R15: dffffc0000000000 22 [ 56.886251] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f6ff7b40 23 [ 56.886255] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 24 [ 56.886259] CR2: 0000000020bb7000 CR3: 00000001c9cec000 CR4: 00000000001406e0 25 [ 56.886267] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 26 [ 56.886272] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 27 [ 56.886273] Stack: 28 [ 56.886285] 0000000000000001 ffff8801cc62c358 ffff8801c57779b0 ffffffff82664fc1 29 [ 56.886299] ffff8801cc62c370 ffffed00398c586b ffffed00398c586e ffff8801cc62c368 30 [ 56.886308] dead4ead00000000 ffff8801cc62c340 0000000000000000 0000000000000000 31 [ 56.886310] Call Trace: 32 [ 56.886319] [<ffffffff82664fc1>] sg_remove_scat.isra.19+0x1c1/0x2d0 33 [ 56.886330] [<ffffffff82665385>] sg_finish_rem_req+0x2b5/0x340 34 [ 56.886340] [<ffffffff82665766>] sg_new_read.isra.20+0x356/0x3e0 35 [ 56.886347] [<ffffffff82663745>] ? sg_get_rq_mark+0x145/0x190 36 [ 56.886357] [<ffffffff8266703d>] sg_read+0x8bd/0x1440 37 [ 56.886366] [<ffffffff82666780>] ? sg_proc_seq_show_debug+0xd10/0xd10 38 [ 56.886378] [<ffffffff81641d00>] ? fsnotify+0xf30/0xf30 39 [ 56.886387] [<ffffffff81bd97f9>] ? avc_policy_seqno+0x9/0x20 40 [ 56.886396] [<ffffffff8156a4e1>] do_loop_readv_writev.part.17+0x141/0x1e0 41 [ 56.886403] [<ffffffff81bd08b9>] ? security_file_permission+0x89/0x1e0 42 [ 56.886410] [<ffffffff82666780>] ? sg_proc_seq_show_debug+0xd10/0xd10 43 [ 56.886417] [<ffffffff82666780>] ? sg_proc_seq_show_debug+0xd10/0xd10 44 [ 56.886424] [<ffffffff8156f402>] compat_do_readv_writev+0x522/0x760 45 [ 56.886431] [<ffffffff8156eee0>] ? do_pwritev+0x1a0/0x1a0 46 [ 56.886439] [<ffffffff812e2010>] ? exit_robust_list+0x230/0x230 47 [ 56.886448] [<ffffffff81df90fb>] ? check_preemption_disabled+0x3b/0x200 48 [ 56.886455] [<ffffffff815cec41>] ? __fget+0x201/0x3a0 49 [ 56.886461] [<ffffffff815cec68>] ? __fget+0x228/0x3a0 50 [ 56.886467] [<ffffffff815cea87>] ? __fget+0x47/0x3a0 51 [ 56.886474] [<ffffffff8156f723>] compat_readv+0xe3/0x150 52 [ 56.886482] [<ffffffff8156f884>] do_compat_readv+0xf4/0x1d0 53 [ 56.886489] [<ffffffff8156f790>] ? compat_readv+0x150/0x150 54 [ 56.886496] [<ffffffff815714a0>] ? SyS_read+0x1b0/0x1b0 55 [ 56.886504] [<ffffffff81571df6>] compat_SyS_readv+0x26/0x30 56 [ 56.886511] [<ffffffff81571dd0>] ? SyS_pwritev2+0x80/0x80 57 [ 56.886518] [<ffffffff81006fc7>] do_fast_syscall_32+0x2f7/0x890 58 [ 56.886525] [<ffffffff81003036>] ? trace_hardirqs_off_thunk+0x1a/0x1c 59 [ 56.886534] [<ffffffff838b0be1>] entry_SYSENTER_compat+0x51/0x60 60 [ 56.886639] Code: e9 27 fc ff ff 0f 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 53 48 89 fb 48 83 c7 1c 48 89 fa 48 83 ec 08 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 3d 61 [ 56.886647] RIP [<ffffffff8144d081>] __free_pages+0x21/0x80 62 [ 56.886649] RSP <ffff8801c5777940> 63 [ 56.886657] ---[ end trace 8afff88f0ca340d1 ]--- 64 [ 56.886660] Kernel panic - not syncing: Fatal exception 65 [ 57.259120] Read of size 4060 at addr ffe70874503c9000 by task syz-executor6/11770 66 [ 57.266791] 67 [ 57.268394] CPU: 0 PID: 11770 Comm: syz-executor6 Tainted: G D 4.9.72-gcb7518e #10 68 [ 57.277195] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 69 [ 57.286519] ffff8801c3dd7ad8 ffffffff81d922b9 ffe70874503c9000 0000000000000fdc 70 [ 57.294479] 0000000000000000 ffff8801c202c540 ffff8801c9c14340 ffff8801c3dd7b20 71 [ 57.302441] ffffffff8153bebe ffffffff82667a16 0000000000000286 112de43e2a9805f9 72 [ 57.310407] Call Trace: 73 [ 57.312966] [<ffffffff81d922b9>] dump_stack+0xc1/0x128 74 [ 57.318304] [<ffffffff8153bebe>] kasan_report+0x15e/0x360 75 [ 57.323898] [<ffffffff82667a16>] ? sg_read+0x1296/0x1440 76 [ 57.329403] [<ffffffff8153a9e7>] check_memory_region+0x137/0x190 77 [ 57.335604] [<ffffffff8153aa51>] kasan_check_read+0x11/0x20 78 [ 57.341368] [<ffffffff82667a16>] sg_read+0x1296/0x1440 79 [ 57.346702] [<ffffffff82666780>] ? sg_proc_seq_show_debug+0xd10/0xd10 80 [ 57.353337] [<ffffffff8123a020>] ? debug_check_no_locks_freed+0x2c0/0x2c0 81 [ 57.360327] [<ffffffff82666780>] ? sg_proc_seq_show_debug+0xd10/0xd10 82 [ 57.366963] [<ffffffff81569903>] __vfs_read+0x103/0x670 83 [ 57.372381] [<ffffffff81569800>] ? default_llseek+0x290/0x290 84 [ 57.378323] [<ffffffff81640e56>] ? fsnotify+0x86/0xf30 85 [ 57.383655] [<ffffffff81641d00>] ? fsnotify+0xf30/0xf30 86 [ 57.389076] [<ffffffff81bd97f9>] ? avc_policy_seqno+0x9/0x20 87 [ 57.394932] [<ffffffff81bea142>] ? selinux_file_permission+0x82/0x460 88 [ 57.401568] [<ffffffff81bd08b9>] ? security_file_permission+0x89/0x1e0 89 [ 57.408290] [<ffffffff8156d3b5>] ? rw_verify_area+0xe5/0x2b0 90 [ 57.414143] [<ffffffff8156d69e>] vfs_read+0x11e/0x380 91 [ 57.419389] [<ffffffff815713c9>] SyS_read+0xd9/0x1b0 92 [ 57.424548] [<ffffffff815712f0>] ? vfs_copy_file_range+0x740/0x740 93 [ 57.430921] [<ffffffff8167a6bc>] ? compat_SyS_ioctl+0x8c/0x2050 94 [ 57.437038] [<ffffffff81006d9f>] ? do_fast_syscall_32+0xcf/0x890 95 [ 57.443239] [<ffffffff815712f0>] ? vfs_copy_file_range+0x740/0x740 96 [ 57.449610] [<ffffffff81006fc7>] do_fast_syscall_32+0x2f7/0x890 97 [ 57.455725] [<ffffffff81003036>] ? trace_hardirqs_off_thunk+0x1a/0x1c 98 [ 57.462365] [<ffffffff838b0be1>] entry_SYSENTER_compat+0x51/0x60 99 [ 57.468563] ================================================================== 100
