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KASAN: wild-memory-access in sg_read

Status: auto-closed as invalid on 2019/02/22 14:50
First crash: 2303d, last: 2303d

Sample crash report:
sg_write: data in/out 262108/32 bytes for SCSI command 0x0-- guessing data in;
   program syz-executor6 not setting count and/or reply_len properly
==================================================================
BUG: KASAN: wild-memory-access in __copy_to_user arch/x86/include/asm/uaccess_64.h:182 [inline]
BUG: KASAN: wild-memory-access in sg_read_oxfer drivers/scsi/sg.c:1978 [inline]
BUG: KASAN: wild-memory-access in sg_read+0x1296/0x1440 drivers/scsi/sg.c:520
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 11774 Comm: syz-executor7 Not tainted 4.9.72-gcb7518e #10
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801c45f9800 task.stack: ffff8801c5770000
RIP: 0010:[<ffffffff8144d081>]  [<ffffffff8144d081>] __read_once_size include/linux/compiler.h:243 [inline]
RIP: 0010:[<ffffffff8144d081>]  [<ffffffff8144d081>] atomic_read arch/x86/include/asm/atomic.h:26 [inline]
RIP: 0010:[<ffffffff8144d081>]  [<ffffffff8144d081>] page_ref_count include/linux/page_ref.h:66 [inline]
RIP: 0010:[<ffffffff8144d081>]  [<ffffffff8144d081>] put_page_testzero include/linux/mm.h:450 [inline]
RIP: 0010:[<ffffffff8144d081>]  [<ffffffff8144d081>] __free_pages+0x21/0x80 mm/page_alloc.c:3903
RSP: 0018:ffff8801c5777940  EFLAGS: 00010a07
RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82664f9b
RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c
RBP: ffff8801c5777950 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: ffff8801c45f9800 R12: 0000000000000004
R13: 0000000000000020 R14: ffff8801cc62c200 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f6ff7b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000020bb7000 CR3: 00000001c9cec000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 0000000000000001 ffff8801cc62c358 ffff8801c57779b0 ffffffff82664fc1
 ffff8801cc62c370 ffffed00398c586b ffffed00398c586e ffff8801cc62c368
 dead4ead00000000 ffff8801cc62c340 0000000000000000 0000000000000000
Call Trace:
 [<ffffffff82664fc1>] sg_remove_scat.isra.19+0x1c1/0x2d0 drivers/scsi/sg.c:1954
 [<ffffffff82665385>] sg_finish_rem_req+0x2b5/0x340 drivers/scsi/sg.c:1836
 [<ffffffff82665766>] sg_new_read.isra.20+0x356/0x3e0 drivers/scsi/sg.c:567
 [<ffffffff8266703d>] sg_read+0x8bd/0x1440 drivers/scsi/sg.c:456
 [<ffffffff8156a4e1>] do_loop_readv_writev.part.17+0x141/0x1e0 fs/read_write.c:714
 [<ffffffff8156f402>] do_loop_readv_writev fs/read_write.c:1105 [inline]
 [<ffffffff8156f402>] compat_do_readv_writev+0x522/0x760 fs/read_write.c:1099
 [<ffffffff8156f723>] compat_readv+0xe3/0x150 fs/read_write.c:1128
 [<ffffffff8156f884>] do_compat_readv+0xf4/0x1d0 fs/read_write.c:1148
 [<ffffffff81571df6>] C_SYSC_readv fs/read_write.c:1160 [inline]
 [<ffffffff81571df6>] compat_SyS_readv+0x26/0x30 fs/read_write.c:1156
 [<ffffffff81006fc7>] do_syscall_32_irqs_on arch/x86/entry/common.c:322 [inline]
 [<ffffffff81006fc7>] do_fast_syscall_32+0x2f7/0x890 arch/x86/entry/common.c:384
 [<ffffffff838b0be1>] entry_SYSENTER_compat+0x51/0x60 arch/x86/entry/entry_64_compat.S:124
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 
RIP  [<ffffffff8144d081>] __read_once_size include/linux/compiler.h:243 [inline]
RIP  [<ffffffff8144d081>] atomic_read arch/x86/include/asm/atomic.h:26 [inline]
RIP  [<ffffffff8144d081>] page_ref_count include/linux/page_ref.h:66 [inline]
RIP  [<ffffffff8144d081>] put_page_testzero include/linux/mm.h:450 [inline]
RIP  [<ffffffff8144d081>] __free_pages+0x21/0x80 mm/page_alloc.c:3903
 RSP <ffff8801c5777940>
---[ end trace 8afff88f0ca340d1 ]---

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2017/12/27 15:20 https://android.googlesource.com/kernel/common android-4.9 cb7518e6167c 09c8f4c0 .config console log report ci-android-49-kasan-gce-386
* Struck through repros no longer work on HEAD.