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[patch 01/19] memcg: fix use-after-free in uncharge_batch | 1 (1) | 2020/09/04 23:35 |
KASAN: use-after-free Write in page_counter_uncharge | 5 (6) | 2020/08/25 15:09 |
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[patch 01/19] memcg: fix use-after-free in uncharge_batch | 1 (1) | 2020/09/04 23:35 |
KASAN: use-after-free Write in page_counter_uncharge | 5 (6) | 2020/08/25 15:09 |
================================================================== BUG: KASAN: use-after-free in instrument_atomic_write include/linux/instrumented.h:71 [inline] BUG: KASAN: use-after-free in atomic64_sub_return include/asm-generic/atomic-instrumented.h:970 [inline] BUG: KASAN: use-after-free in atomic_long_sub_return include/asm-generic/atomic-long.h:113 [inline] BUG: KASAN: use-after-free in page_counter_cancel mm/page_counter.c:54 [inline] BUG: KASAN: use-after-free in page_counter_uncharge+0x3d/0xc0 mm/page_counter.c:156 Write of size 8 at addr ffff88804726a148 by task syz-executor.2/27770 CPU: 1 PID: 27770 Comm: syz-executor.2 Not tainted 5.9.0-rc1-syzkaller #0 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+0x1f0/0x31e lib/dump_stack.c:118 print_address_description+0x66/0x620 mm/kasan/report.c:383 __kasan_report mm/kasan/report.c:513 [inline] kasan_report+0x132/0x1d0 mm/kasan/report.c:530 check_memory_region_inline mm/kasan/generic.c:183 [inline] check_memory_region+0x2b5/0x2f0 mm/kasan/generic.c:192 instrument_atomic_write include/linux/instrumented.h:71 [inline] atomic64_sub_return include/asm-generic/atomic-instrumented.h:970 [inline] atomic_long_sub_return include/asm-generic/atomic-long.h:113 [inline] page_counter_cancel mm/page_counter.c:54 [inline] page_counter_uncharge+0x3d/0xc0 mm/page_counter.c:156 uncharge_batch+0x6c/0x350 mm/memcontrol.c:6764 uncharge_list mm/memcontrol.c:6839 [inline] mem_cgroup_uncharge_list+0xb3/0xe0 mm/memcontrol.c:6877 release_pages+0x13a2/0x1550 mm/swap.c:912 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline] tlb_flush_mmu_free mm/mmu_gather.c:242 [inline] tlb_flush_mmu+0x780/0x910 mm/mmu_gather.c:249 tlb_finish_mmu+0xcb/0x200 mm/mmu_gather.c:328 exit_mmap+0x296/0x550 mm/mmap.c:3185 __mmput+0x113/0x370 kernel/fork.c:1076 exit_mm+0x4cd/0x550 kernel/exit.c:483 do_exit+0x576/0x1f20 kernel/exit.c:793 do_group_exit+0x161/0x2d0 kernel/exit.c:903 get_signal+0x13bb/0x1d50 kernel/signal.c:2757 arch_do_signal+0x33/0x610 arch/x86/kernel/signal.c:811 exit_to_user_mode_loop kernel/entry/common.c:135 [inline] exit_to_user_mode_prepare+0x8d/0x1b0 kernel/entry/common.c:166 syscall_exit_to_user_mode+0x5e/0x1a0 kernel/entry/common.c:241 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45d579 Code: Bad RIP value. RSP: 002b:00007fc74a47fcf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000118cf48 RCX: 000000000045d579 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000118cf48 RBP: 000000000118cf40 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c R13: 00007fff76934c7f R14: 00007fc74a4809c0 R15: 000000000118cf4c Allocated by task 27720: kasan_save_stack mm/kasan/common.c:48 [inline] kasan_set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc+0x100/0x130 mm/kasan/common.c:461 __do_kmalloc mm/slab.c:3655 [inline] __kmalloc+0x218/0x320 mm/slab.c:3664 mem_cgroup_alloc mm/memcontrol.c:5210 [inline] mem_cgroup_css_alloc+0x86/0x1590 mm/memcontrol.c:5278 css_create kernel/cgroup/cgroup.c:5128 [inline] cgroup_apply_control_enable+0x581/0x1200 kernel/cgroup/cgroup.c:3059 cgroup_apply_control+0x37/0x6c0 kernel/cgroup/cgroup.c:3141 cgroup_subtree_control_write+0x95b/0x10c0 kernel/cgroup/cgroup.c:3299 cgroup_file_write+0x21e/0x5c0 kernel/cgroup/cgroup.c:3697 kernfs_fop_write+0x3f4/0x4f0 fs/kernfs/file.c:315 vfs_write+0x2d3/0xd10 fs/read_write.c:576 ksys_write+0x11b/0x220 fs/read_write.c:631 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 23: kasan_save_stack mm/kasan/common.c:48 [inline] kasan_set_track+0x3d/0x70 mm/kasan/common.c:56 kasan_set_free_info+0x17/0x30 mm/kasan/generic.c:355 __kasan_slab_free+0xdd/0x110 mm/kasan/common.c:422 __cache_free mm/slab.c:3418 [inline] kfree+0x10a/0x220 mm/slab.c:3756 mem_cgroup_free+0x97f/0x9b0 mm/memcontrol.c:5196 css_free_rwork_fn+0xe4/0x970 kernel/cgroup/cgroup.c:4941 process_one_work+0x789/0xfc0 kernel/workqueue.c:2269 worker_thread+0xaa4/0x1460 kernel/workqueue.c:2415 kthread+0x37e/0x3a0 drivers/block/aoe/aoecmd.c:1234 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Last call_rcu(): kasan_save_stack+0x27/0x50 mm/kasan/common.c:48 kasan_record_aux_stack+0x7b/0xb0 mm/kasan/generic.c:346 __call_rcu kernel/rcu/tree.c:2894 [inline] call_rcu+0x139/0x840 kernel/rcu/tree.c:2968 queue_rcu_work+0x74/0x90 kernel/workqueue.c:1747 process_one_work+0x789/0xfc0 kernel/workqueue.c:2269 worker_thread+0xaa4/0x1460 kernel/workqueue.c:2415 kthread+0x37e/0x3a0 drivers/block/aoe/aoecmd.c:1234 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Second to last call_rcu(): kasan_save_stack+0x27/0x50 mm/kasan/common.c:48 kasan_record_aux_stack+0x7b/0xb0 mm/kasan/generic.c:346 __call_rcu kernel/rcu/tree.c:2894 [inline] call_rcu+0x139/0x840 kernel/rcu/tree.c:2968 __percpu_ref_switch_to_atomic lib/percpu-refcount.c:192 [inline] __percpu_ref_switch_mode+0x2c1/0x4f0 lib/percpu-refcount.c:237 percpu_ref_kill_and_confirm+0x8f/0x130 lib/percpu-refcount.c:350 cgroup_apply_control_disable kernel/cgroup/cgroup.c:3108 [inline] cgroup_finalize_control+0x7c5/0xd60 kernel/cgroup/cgroup.c:3171 cgroup_subtree_control_write+0x968/0x10c0 kernel/cgroup/cgroup.c:3300 cgroup_file_write+0x21e/0x5c0 kernel/cgroup/cgroup.c:3697 kernfs_fop_write+0x3f4/0x4f0 fs/kernfs/file.c:315 vfs_write+0x2d3/0xd10 fs/read_write.c:576 ksys_write+0x11b/0x220 fs/read_write.c:631 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff88804726a000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 328 bytes inside of 4096-byte region [ffff88804726a000, ffff88804726b000) The buggy address belongs to the page: page:00000000d314f8b5 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4726a head:00000000d314f8b5 order:1 compound_mapcount:0 flags: 0xfffe0000010200(slab|head) raw: 00fffe0000010200 ffffea0001259f88 ffffea00014b9588 ffff8880aa440900 raw: 0000000000000000 ffff88804726a000 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88804726a000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88804726a080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88804726a100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88804726a180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88804726a200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================
Time | Kernel | Commit | Syzkaller | Config | Log | Report | Syz repro | C repro | VM info | Assets (help?) | Manager | Title |
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2020/08/23 18:56 | upstream | c3d8f220d012 | cef5ae68 | .config | console log | report | ci-upstream-kasan-gce-smack-root | |||||
2020/08/14 14:30 | upstream | a1d21081a60d | 424dd8e7 | .config | console log | report | ci-upstream-kasan-gce-smack-root |