Messages in this thread | | | From | Dmitry Vyukov <> | Date | Wed, 15 Nov 2017 11:44:12 +0100 | Subject | KASAN: use-after-free in membarrier_mm_sync_core_before_usermode |
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Hello,
I've tried to run latest linux-next on:
commit 63fb091c80188ec51f53514d07de907c1dd3d61d Author: Stephen Rothwell <sfr@...> Date: Wed Nov 15 16:44:31 2017 +1100 Add linux-next specific files for 20171115
and it crashes during boot with:
================================================================== BUG: KASAN: use-after-free in __read_once_size include/linux/compiler.h:183 [inline] BUG: KASAN: use-after-free in atomic_read arch/x86/include/asm/atomic.h:27 [inline] BUG: KASAN: use-after-free in membarrier_mm_sync_core_before_usermode include/linux/sched/mm.h:216 [inline] BUG: KASAN: use-after-free in finish_task_switch+0x61f/0x7c0 kernel/sched/core.c:2712 Read of size 4 at addr ffff880064fe5170 by task rc/1535
CPU: 0 PID: 1535 Comm: rc Not tainted 4.14.0-next-20171115 #22 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:53 print_address_description+0x73/0x250 mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report+0x25b/0x340 mm/kasan/report.c:409 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:429 __read_once_size include/linux/compiler.h:183 [inline] atomic_read arch/x86/include/asm/atomic.h:27 [inline] membarrier_mm_sync_core_before_usermode include/linux/sched/mm.h:216 [inline] finish_task_switch+0x61f/0x7c0 kernel/sched/core.c:2712 schedule_tail+0xe/0x100 kernel/sched/core.c:2789 ret_from_fork+0x8/0x30 arch/x86/entry/entry_64.S:422 RIP: 0033:0x7fee2a8fdf46 RSP: 002b:00007ffddfd435b0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: 0000000000000000 RBX: 00007ffddfd435b0 RCX: 00007fee2a8fdf46 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 00007ffddfd435f0 R08: 0000000000000000 R09: 00000000000005fc R10: 00007fee2adf59d0 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000415d62 R15: 0000000000000001
Allocated by task 1532: save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:489 kmem_cache_alloc+0x12e/0x760 mm/slab.c:3548 dup_mm kernel/fork.c:1230 [inline] copy_mm+0x30a/0x1310 kernel/fork.c:1293 copy_process.part.36+0x1f31/0x4d70 kernel/fork.c:1797 copy_process kernel/fork.c:1610 [inline] _do_fork+0x1ef/0xff0 kernel/fork.c:2091 SYSC_clone kernel/fork.c:2201 [inline] SyS_clone+0x37/0x50 kernel/fork.c:2195 do_syscall_64+0x26c/0x920 arch/x86/entry/common.c:286 return_from_SYSCALL_64+0x0/0x75
Freed by task 1535: save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3492 [inline] kmem_cache_free+0x77/0x280 mm/slab.c:3750 __mmdrop+0x242/0x3d0 kernel/fork.c:604 mmdrop+0x28/0x30 kernel/fork.c:610 finish_task_switch+0x204/0x7c0 kernel/sched/core.c:2711 schedule_tail+0xe/0x100 kernel/sched/core.c:2789 ret_from_fork+0x8/0x30 arch/x86/entry/entry_64.S:422
The buggy address belongs to the object at ffff880064fe4d00 which belongs to the cache mm_struct of size 1368 The buggy address is located 1136 bytes inside of 1368-byte region [ffff880064fe4d00, ffff880064fe5258) The buggy address belongs to the page: page:ffffea000193f900 count:1 mapcount:0 mapping:ffff880064fe4100 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000008100(slab|head) raw: 01fffc0000008100 ffff880064fe4100 0000000000000000 0000000100000005 raw: ffffea000193eba0 ffff88006c9f8f50 ffff88006c9f7b40 0000000000000000 page dumped because: kasan: bad access detected
Memory state around the buggy address: ffff880064fe5000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff880064fe5080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff880064fe5100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff880064fe5180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff880064fe5200: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc ==================================================================
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