#syz dup: kernel BUG at lib/string.c:LINE! (3) On Thu, Mar 29, 2018 at 03:01:02PM -0700, syzbot wrote: > Hello, > > syzbot hit the following crash on upstream commit > 0b412605ef5f5c64b31f19e2910b1d5eba9929c3 (Thu Mar 29 01:07:23 2018 +0000) > Merge tag 'drm-fixes-for-v4.16-rc8' of > git://people.freedesktop.org/~airlied/linux > syzbot dashboard link: > https://syzkaller.appspot.com/bug?extid=4b6afe4bdd99cb99e664 > > So far this crash happened 4 times on upstream. > C reproducer: https://syzkaller.appspot.com/x/repro.c?id=6021023174492160 > syzkaller reproducer: > https://syzkaller.appspot.com/x/repro.syz?id=6269942299099136 > Raw console output: > https://syzkaller.appspot.com/x/log.txt?id=6347752745205760 > Kernel config: > https://syzkaller.appspot.com/x/.config?id=-8440362230543204781 > compiler: gcc (GCC) 7.1.1 20170620 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+4b6afe4bdd99cb99e664@xxxxxxxxxxxxxxxxxxxxxxxxx > It will help syzbot understand when the bug is fixed. See footer for > details. > If you forward the report, please keep this part and the footer. > > ================================================================== > BUG: KASAN: stack-out-of-bounds in memcpy include/linux/string.h:345 > [inline] > BUG: KASAN: stack-out-of-bounds in rdma_bind_addr+0x13b/0x1d60 > drivers/infiniband/core/cma.c:3361 > Read of size 48 at addr ffff8801af717a50 by task syzkaller366236/4421 > > CPU: 0 PID: 4421 Comm: syzkaller366236 Not tainted 4.16.0-rc7+ #5 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:17 [inline] > dump_stack+0x194/0x24d lib/dump_stack.c:53 > print_address_description+0x73/0x250 mm/kasan/report.c:256 > kasan_report_error mm/kasan/report.c:354 [inline] > kasan_report+0x23c/0x360 mm/kasan/report.c:412 > check_memory_region_inline mm/kasan/kasan.c:260 [inline] > check_memory_region+0x137/0x190 mm/kasan/kasan.c:267 > memcpy+0x23/0x50 mm/kasan/kasan.c:302 > memcpy include/linux/string.h:345 [inline] > rdma_bind_addr+0x13b/0x1d60 drivers/infiniband/core/cma.c:3361 > ucma_bind_ip+0x10a/0x190 drivers/infiniband/core/ucma.c:639 > ucma_write+0x2d6/0x3d0 drivers/infiniband/core/ucma.c:1649 > __vfs_write+0xef/0x970 fs/read_write.c:480 > vfs_write+0x189/0x510 fs/read_write.c:544 > SYSC_write fs/read_write.c:589 [inline] > SyS_write+0xef/0x220 fs/read_write.c:581 > do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 > entry_SYSCALL_64_after_hwframe+0x42/0xb7 > RIP: 0033:0x43fdd9 > RSP: 002b:00007ffc69ab4bb8 EFLAGS: 00000217 ORIG_RAX: 0000000000000001 > RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fdd9 > RDX: 0000000000000090 RSI: 0000000020000080 RDI: 0000000000000003 > RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 > R10: 00000000004002c8 R11: 0000000000000217 R12: 0000000000401700 > R13: 0000000000401790 R14: 0000000000000000 R15: 0000000000000000 > > The buggy address belongs to the page: > page:ffffea0006bdc5c0 count:0 mapcount:0 mapping:0000000000000000 index:0x0 > flags: 0x2fffc0000000000() > raw: 02fffc0000000000 0000000000000000 0000000000000000 00000000ffffffff > raw: 0000000000000000 ffffea0006bd0101 0000000000000000 0000000000000000 > page dumped because: kasan: bad access detected > > Memory state around the buggy address: > ffff8801af717900: 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 04 f2 > ffff8801af717980: f2 f2 f2 f2 f2 f2 04 f2 f2 f2 f3 f3 f3 f3 00 00 > > ffff8801af717a00: 00 00 00 00 00 f1 f1 f1 f1 00 00 00 00 00 f2 f2 > ^ > ffff8801af717a80: f2 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f1 > ffff8801af717b00: f1 f1 f1 00 f2 f2 f2 f3 f3 f3 f3 00 00 00 00 00 > ================================================================== > > > --- > This bug is generated by a dumb bot. It may contain errors. > See https://goo.gl/tpsmEJ for details. > Direct all questions to syzkaller@xxxxxxxxxxxxxxxx. > > syzbot will keep track of this bug report. > If you forgot to add the Reported-by tag, once the fix for this bug is > merged > into any tree, please reply to this email with: > #syz fix: exact-commit-title > If you want to test a patch for this bug, please reply with: > #syz test: git://repo/address.git branch > and provide the patch inline or as an attachment. > To mark this as a duplicate of another syzbot report, please reply with: > #syz dup: exact-subject-of-another-report > If it's a one-off invalid bug report, please reply with: > #syz invalid > Note: if the crash happens again, it will cause creation of a new bug > report. > Note: all commands must start from beginning of the line in the email body.
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