On Sat, Jul 7, 2018 at 9:10 AM syzbot <syzbot+908eac39ffdc39221032@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > Hello, > > syzbot found the following crash on: > > HEAD commit: fc36def997cf mm: teach dump_page() to correctly output poi.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=1378110c400000 > kernel config: https://syzkaller.appspot.com/x/.config?x=2ca6c7a31d407f86 > dashboard link: https://syzkaller.appspot.com/bug?extid=908eac39ffdc39221032 > compiler: gcc (GCC) 8.0.1 20180413 (experimental) > > Unfortunately, I don't have any reproducer for this crash yet. > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+908eac39ffdc39221032@xxxxxxxxxxxxxxxxxxxxxxxxx > > netlink: 4 bytes leftover after parsing attributes in process > `syz-executor0'. > QAT: Invalid ioctl > capability: warning: `syz-executor0' uses deprecated v2 capabilities in a > way that may be insecure > ================================================================== > BUG: KASAN: use-after-free in rdma_ip2gid include/rdma/ib_addr.h:143 > [inline] > BUG: KASAN: use-after-free in cma_acquire_dev+0xe56/0xea0 > drivers/infiniband/core/cma.c:654 > Read of size 2 at addr ffff88019c561360 by task syz-executor2/8894 This seems to have been fixed by: #syz fix: ucma: fix a use-after-free in ucma_resolve_ip() So let's close the bug. Pile of neglected bug reports is not too useful. > CPU: 1 PID: 8894 Comm: syz-executor2 Not tainted 4.18.0-rc3+ #131 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:77 [inline] > dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113 > print_address_description+0x6c/0x20b mm/kasan/report.c:256 > kasan_report_error mm/kasan/report.c:354 [inline] > kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412 > __asan_report_load2_noabort+0x14/0x20 mm/kasan/report.c:431 > rdma_ip2gid include/rdma/ib_addr.h:143 [inline] > cma_acquire_dev+0xe56/0xea0 drivers/infiniband/core/cma.c:654 > rdma_bind_addr+0x248/0x23b0 drivers/infiniband/core/cma.c:3388 > cma_bind_addr drivers/infiniband/core/cma.c:2930 [inline] > rdma_resolve_addr+0x500/0x28a0 drivers/infiniband/core/cma.c:2942 > ucma_resolve_ip+0x242/0x2a0 drivers/infiniband/core/ucma.c:711 > ucma_write+0x336/0x420 drivers/infiniband/core/ucma.c:1680 > __vfs_write+0x117/0x9f0 fs/read_write.c:485 > vfs_write+0x1f8/0x560 fs/read_write.c:549 > ksys_write+0x101/0x260 fs/read_write.c:598 > __do_sys_write fs/read_write.c:610 [inline] > __se_sys_write fs/read_write.c:607 [inline] > __x64_sys_write+0x73/0xb0 fs/read_write.c:607 > do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 > entry_SYSCALL_64_after_hwframe+0x49/0xbe > RIP: 0033:0x455ba9 > Code: 1d ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 > 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff > ff 0f 83 eb b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 > RSP: 002b:00007fb04c987c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 > RAX: ffffffffffffffda RBX: 00007fb04c9886d4 RCX: 0000000000455ba9 > RDX: 0000000000000048 RSI: 00000000200002c0 RDI: 0000000000000015 > RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff > R13: 00000000004c7f98 R14: 00000000004d4160 R15: 0000000000000000 > > Allocated by task 8894: > save_stack+0x43/0xd0 mm/kasan/kasan.c:448 > set_track mm/kasan/kasan.c:460 [inline] > kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 > kmem_cache_alloc_trace+0x152/0x780 mm/slab.c:3620 > kmalloc include/linux/slab.h:513 [inline] > kzalloc include/linux/slab.h:707 [inline] > __rdma_create_id+0xdf/0x720 drivers/infiniband/core/cma.c:780 > ucma_create_id+0x399/0x9d0 drivers/infiniband/core/ucma.c:502 > ucma_write+0x336/0x420 drivers/infiniband/core/ucma.c:1680 > __vfs_write+0x117/0x9f0 fs/read_write.c:485 > vfs_write+0x1f8/0x560 fs/read_write.c:549 > ksys_write+0x101/0x260 fs/read_write.c:598 > __do_sys_write fs/read_write.c:610 [inline] > __se_sys_write fs/read_write.c:607 [inline] > __x64_sys_write+0x73/0xb0 fs/read_write.c:607 > do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 > entry_SYSCALL_64_after_hwframe+0x49/0xbe > > Freed by task 8905: > save_stack+0x43/0xd0 mm/kasan/kasan.c:448 > set_track mm/kasan/kasan.c:460 [inline] > __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521 > kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 > __cache_free mm/slab.c:3498 [inline] > kfree+0xd9/0x260 mm/slab.c:3813 > rdma_destroy_id+0x8cd/0xe60 drivers/infiniband/core/cma.c:1703 > ucma_close+0x100/0x300 drivers/infiniband/core/ucma.c:1759 > __fput+0x355/0x8b0 fs/file_table.c:209 > ____fput+0x15/0x20 fs/file_table.c:243 > task_work_run+0x1ec/0x2a0 kernel/task_work.c:113 > tracehook_notify_resume include/linux/tracehook.h:192 [inline] > exit_to_usermode_loop+0x313/0x370 arch/x86/entry/common.c:166 > prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] > syscall_return_slowpath arch/x86/entry/common.c:268 [inline] > do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 > entry_SYSCALL_64_after_hwframe+0x49/0xbe > > The buggy address belongs to the object at ffff88019c561340 > which belongs to the cache kmalloc-2048 of size 2048 > The buggy address is located 32 bytes inside of > 2048-byte region [ffff88019c561340, ffff88019c561b40) > The buggy address belongs to the page: > page:ffffea0006715800 count:1 mapcount:0 mapping:ffff8801da800c40 > index:0xffff88019c560240 compound_mapcount: 0 > flags: 0x2fffc0000008100(slab|head) > raw: 02fffc0000008100 ffffea00066fb108 ffffea000670dc08 ffff8801da800c40 > raw: ffff88019c560240 ffff88019c560240 0000000100000002 0000000000000000 > page dumped because: kasan: bad access detected > > Memory state around the buggy address: > ffff88019c561200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff88019c561280: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc > > ffff88019c561300: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb > ^ > ffff88019c561380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff88019c561400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ================================================================== > > > --- > This bug is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. > > syzbot will keep track of this bug report. See: > https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with > syzbot. > > -- > You received this message because you are subscribed to the Google Groups "syzkaller-bugs" group. > To unsubscribe from this group and stop receiving emails from it, send an email to syzkaller-bugs+unsubscribe@xxxxxxxxxxxxxxxx. > To view this discussion on the web visit https://groups.google.com/d/msgid/syzkaller-bugs/000000000000195e0e057063783e%40google.com. > For more options, visit https://groups.google.com/d/optout.
