1 TITLE: KASAN: wild-memory-access Read in sg_read 2 3 [ 67.633749] ================================================================== 4 [ 67.633767] BUG: KASAN: wild-memory-access in sg_read+0xe5c/0x1440 5 [ 67.633774] Read of size 4096 at addr ffe70873f7f2b000 by task syz-executor1/13133 6 [ 67.633775] 7 [ 67.633796] CPU: 0 PID: 13133 Comm: syz-executor1 Not tainted 4.9.80-g550c01d #29 8 [ 67.633801] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 9 [ 67.633815] ffff8801b42afa38 ffffffff81d94b69 ffe70873f7f2b000 0000000000001000 10 [ 67.633827] 0000000000000000 0000000000000000 ffff8801c5ef4340 ffff8801b42afa80 11 [ 67.633838] ffffffff8153e49e ffffffff8266a72c 0000000000000282 b11e0ea3aa111a19 12 [ 67.633841] Call Trace: 13 [ 67.633851] [<ffffffff81d94b69>] dump_stack+0xc1/0x128 14 [ 67.633860] [<ffffffff8153e49e>] kasan_report+0x15e/0x360 15 [ 67.633867] [<ffffffff8266a72c>] ? sg_read+0xe5c/0x1440 16 [ 67.633875] [<ffffffff8153cfc7>] check_memory_region+0x137/0x190 17 [ 67.633882] [<ffffffff8153d031>] kasan_check_read+0x11/0x20 18 [ 27.258999] ================================================================== 19 [ 27.260623] kasan: CONFIG_KASAN_INLINE enabled 20 [ 27.260630] kasan: GPF could be caused by NULL-ptr deref or user memory access 21 [ 27.260634] general protection fault: 0000 [#1] PREEMPT SMP KASAN 22 [ 27.260638] Dumping ftrace buffer: 23 [ 27.260641] (ftrace buffer empty) 24 [ 27.260644] Modules linked in: 25 [ 27.260651] CPU: 1 PID: 3377 Comm: syzkaller685434 Not tainted 4.4.107-g610c835 #4 26 [ 27.260654] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 27 [ 27.260658] task: ffff8800b823c740 task.stack: ffff8801d94c8000 28 [ 27.260671] RIP: 0010:[<ffffffff8123487f>] [<ffffffff8123487f>] __lock_acquire+0x61f/0x4b50 29 [ 27.260675] RSP: 0018:ffff8801d94cf880 EFLAGS: 00010086 30 [ 27.260678] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff81237ade 31 [ 27.260682] RDX: 1ffff1003a313890 RSI: 0000000000000008 RDI: ffff8801d189c480 32 [ 27.260685] RBP: ffff8801d94cfa20 R08: 0000000000000001 R09: 0000000000000001 33 [ 27.260688] R10: 0000000000000001 R11: 1ffff1003b299f22 R12: 0000000000000000 34 [ 27.260692] R13: ffff8800b823c740 R14: ffff8801d189c478 R15: 0000000000000000 35 [ 27.260697] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f47d3b40 36 [ 27.260701] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 37 [ 27.260704] CR2: 00000000206f6000 CR3: 00000001d0a15000 CR4: 00000000001406e0 38 [ 27.260713] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 39 [ 27.260717] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 40 [ 27.260718] Stack: 41 [ 27.260725] ffff8801d0ee0818 ffff8800b4b59d90 ffff8801d94cfa00 ffffffff8149e232 42 [ 27.260733] ffff8801d94cf8b0 ffffffff00000000 ffff8800b823c740 ffff8800b823cfb0 43 [ 27.260739] 0000000000000288 ffff8800b823c740 0000000000000002 0000000000000002 44 [ 27.260741] Call Trace: 45 [ 27.260751] [<ffffffff8149e232>] ? handle_mm_fault+0x3f2/0x3190 46 [ 27.260758] [<ffffffff81234260>] ? debug_check_no_locks_freed+0x2c0/0x2c0 47 [ 27.260764] [<ffffffff8148979e>] ? vmacache_update+0xfe/0x130 48 [ 27.260772] [<ffffffff810db470>] ? __do_page_fault+0x380/0xa00 49 [ 27.260778] [<ffffffff8123a61e>] lock_acquire+0x15e/0x460 50 [ 27.260787] [<ffffffff825b8a89>] ? sg_remove_request+0x69/0x110 51 [ 27.260794] [<ffffffff83773a1e>] _raw_write_lock_irqsave+0x4e/0x70 52 [ 27.260800] [<ffffffff825b8a89>] ? sg_remove_request+0x69/0x110 53 [ 27.260806] [<ffffffff825b8a89>] sg_remove_request+0x69/0x110 54 [ 27.260813] [<ffffffff825b9095>] sg_finish_rem_req+0x295/0x340 55 [ 27.260819] [<ffffffff825baed1>] sg_read+0xa21/0x1490 56 [ 67.633888] [<ffffffff8266a72c>] sg_read+0xe5c/0x1440 57 [ 67.633896] [<ffffffff826698d0>] ? sg_proc_seq_show_debug+0xd90/0xd90 58 [ 67.633902] [<ffffffff81644640>] ? fsnotify+0xf30/0xf30 59 [ 67.633910] [<ffffffff81bdc219>] ? avc_policy_seqno+0x9/0x20 60 [ 67.633919] [<ffffffff8156cc21>] do_loop_readv_writev.part.17+0x141/0x1e0 61 [ 67.633926] [<ffffffff81bd32d9>] ? security_file_permission+0x89/0x1e0 62 [ 67.633933] [<ffffffff826698d0>] ? sg_proc_seq_show_debug+0xd90/0xd90 63 [ 67.633940] [<ffffffff826698d0>] ? sg_proc_seq_show_debug+0xd90/0xd90 64 [ 67.633947] [<ffffffff81570a90>] do_readv_writev+0x520/0x750 65 [ 67.633954] [<ffffffff81570570>] ? vfs_write+0x530/0x530 66 [ 67.633962] [<ffffffff8136b494>] ? kcov_ioctl+0x24/0x1c0 67 [ 67.633972] [<ffffffff81dfbfab>] ? check_preemption_disabled+0x3b/0x200 68 [ 67.633979] [<ffffffff815d1581>] ? __fget+0x201/0x3a0 69 [ 67.633986] [<ffffffff815d15a8>] ? __fget+0x228/0x3a0 70 [ 67.633992] [<ffffffff815d13c7>] ? __fget+0x47/0x3a0 71 [ 67.634000] [<ffffffff81570d44>] vfs_readv+0x84/0xc0 72 [ 67.634007] [<ffffffff81570e66>] do_readv+0xe6/0x250 73 [ 67.634014] [<ffffffff81570d80>] ? vfs_readv+0xc0/0xc0 74 [ 67.634022] [<ffffffff838b344a>] ? entry_SYSCALL_64_fastpath+0x5/0xe8 75 [ 67.634032] [<ffffffff8123b64b>] ? trace_hardirqs_on_caller+0x38b/0x590 76 [ 67.634040] [<ffffffff81574357>] SyS_readv+0x27/0x30 77 [ 67.634047] [<ffffffff838b346e>] entry_SYSCALL_64_fastpath+0x29/0xe8 78 [ 67.634050] ================================================================== 79
