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Tue, 17 Dec 2024 02:52:32 -0800 (PST) MIME-Version: 1.0 From: Sam Sun Date: Tue, 17 Dec 2024 18:52:21 +0800 Message-ID: Subject: [Bug] KASAN: slab-use-after-free Read in zswap_decompress To: linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: syzkaller-bugs@googlegroups.com, akpm@linux-foundation.org, chengming.zhou@linux.dev, Nhat Pham , yosryahmed@google.com, hannes@cmpxchg.org Content-Type: text/plain; charset="UTF-8" X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: F3668100003 X-Stat-Signature: us9s6iiaoctxx9y9n4kh4skuxdi6f41d X-Rspam-User: X-HE-Tag: 1734432719-655766 X-HE-Meta: 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 /hQVTs3F fRmhedxqOqm15pnDsuMjWxFSlOUs3VbmsHEwch8El6LK/4TRaKGfdktWOFdiVBpfC8caFWRHrP5ycW0xzEpujtoWqJB3QoA9Vsj8KBg92NRXtjT/OoysIkKMU+SSiXy/7IlML5qR/S/jPFfUJZ79NbCY3xT0f6ycrvDOFfWBEFAqY6kQnVnkJDn3w81LhI2qm4W1kWvnml5Q0XIyWrSxzHQJ+jDDZ1pWMJARPFG/DfDGudOsOLAFgkP7ef4OfwTh9CLaN/EFSBE62hR2yvF0ju9gmFf1x9Qt8CCY+fWYCZIXazqEVdyBuG2ideuGjDq6Rs0rZgDfCe9ZmHv9QYP0oEYQCy7rgwfA4Tg9Y3wy7g9K0PIadtV1w9GCwnUXIH4hr6SIHUdaYTXddsYkTT3yyaofP4BAv+UaKfNeAtkyUY9InVuA= X-Bogosity: Ham, tests=bogofilter, spamicity=0.379582, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Dear developers and maintainers, We encountered a slab-use-after-free bug while using our modified syzkaller. Kernel crash log is listed below. ================================================================== BUG: KASAN: slab-use-after-free in zswap_decompress+0x7d7/0x810 mm/zswap.c:988 Read of size 4 at addr ffff888027874044 by task kswapd0/92 CPU: 1 UID: 0 PID: 92 Comm: kswapd0 Not tainted 6.12.0-09435-g2c22dc1ee3a1 #11 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.1-0-g3208b098f51a-prebuilt.qemu.org 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1b0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xc0/0x5e0 mm/kasan/report.c:489 kasan_report+0xbd/0xf0 mm/kasan/report.c:602 zswap_decompress+0x7d7/0x810 mm/zswap.c:988 zswap_writeback_entry+0x1e9/0x860 mm/zswap.c:1058 shrink_memcg_cb+0x213/0x360 mm/zswap.c:1163 __list_lru_walk_one+0x15e/0x490 mm/list_lru.c:301 list_lru_walk_one+0x3e/0x50 mm/list_lru.c:338 list_lru_shrink_walk include/linux/list_lru.h:240 [inline] zswap_shrinker_scan+0x135/0x220 mm/zswap.c:1197 do_shrink_slab+0x44e/0x1190 mm/shrinker.c:437 shrink_slab_memcg mm/shrinker.c:550 [inline] shrink_slab+0xb61/0x12a0 mm/shrinker.c:628 shrink_one+0x4ad/0x7c0 mm/vmscan.c:4836 shrink_many mm/vmscan.c:4897 [inline] lru_gen_shrink_node mm/vmscan.c:4975 [inline] shrink_node+0x269a/0x3d60 mm/vmscan.c:5956 kswapd_shrink_node mm/vmscan.c:6785 [inline] balance_pgdat+0xbe5/0x18c0 mm/vmscan.c:6977 kswapd+0x6ff/0xd60 mm/vmscan.c:7246 kthread+0x2ca/0x3b0 kernel/kthread.c:389 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Allocated by task 1: kasan_save_stack+0x24/0x50 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4283 [inline] __kmalloc_noprof+0x212/0x530 mm/slub.c:4295 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1037 [inline] __acomp_request_alloc_noprof include/crypto/internal/acompress.h:75 [inline] acomp_request_alloc+0x46/0x110 crypto/acompress.c:131 zswap_cpu_comp_prepare+0x1f4/0x470 mm/zswap.c:840 cpuhp_invoke_callback+0x26d/0x9d0 kernel/cpu.c:204 cpuhp_issue_call+0x1c1/0x8d0 kernel/cpu.c:2375 __cpuhp_state_add_instance_cpuslocked+0x26a/0x3c0 kernel/cpu.c:2437 __cpuhp_state_add_instance+0xd7/0x2e0 kernel/cpu.c:2458 cpuhp_state_add_instance include/linux/cpuhotplug.h:386 [inline] zswap_pool_create+0x2c3/0x5c0 mm/zswap.c:288 __zswap_pool_create_fallback mm/zswap.c:356 [inline] zswap_setup+0x3a5/0x820 mm/zswap.c:1781 zswap_init+0x2d/0x40 mm/zswap.c:1817 do_one_initcall+0x111/0x6d0 init/main.c:1266 do_initcall_level init/main.c:1328 [inline] do_initcalls init/main.c:1344 [inline] do_basic_setup init/main.c:1363 [inline] kernel_init_freeable+0x5ae/0x8a0 init/main.c:1577 kernel_init+0x1e/0x2d0 init/main.c:1466 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Freed by task 25: kasan_save_stack+0x24/0x50 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:582 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x54/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2338 [inline] slab_free mm/slub.c:4598 [inline] kfree+0x14e/0x4d0 mm/slub.c:4746 zswap_cpu_comp_dead+0xe3/0x1c0 mm/zswap.c:874 cpuhp_invoke_callback+0x564/0x9d0 kernel/cpu.c:216 __cpuhp_invoke_callback_range+0x104/0x220 kernel/cpu.c:965 cpuhp_invoke_callback_range kernel/cpu.c:989 [inline] cpuhp_down_callbacks kernel/cpu.c:1382 [inline] _cpu_down+0x41d/0xef0 kernel/cpu.c:1443 __cpu_down_maps_locked+0x6f/0x90 kernel/cpu.c:1473 work_for_cpu_fn+0x55/0xa0 kernel/workqueue.c:6719 process_one_work+0x9a2/0x1ba0 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x677/0xe90 kernel/workqueue.c:3391 kthread+0x2ca/0x3b0 kernel/kthread.c:389 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 The buggy address belongs to the object at ffff888027874000 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 68 bytes inside of freed 96-byte region [ffff888027874000, ffff888027874060) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x27874 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff88801b041280 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000200020 00000001f5000000 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 1, tgid 1 (swapper/0), ts 20389586985, free_ts 18720773637 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2e7/0x350 mm/page_alloc.c:1556 prep_new_page mm/page_alloc.c:1564 [inline] get_page_from_freelist+0xe4e/0x2b20 mm/page_alloc.c:3474 __alloc_pages_noprof+0x219/0x21f0 mm/page_alloc.c:4751 alloc_pages_mpol_noprof+0x2b6/0x600 mm/mempolicy.c:2265 alloc_slab_page mm/slub.c:2408 [inline] allocate_slab mm/slub.c:2574 [inline] new_slab+0x2d5/0x420 mm/slub.c:2627 ___slab_alloc+0xbb7/0x1850 mm/slub.c:3815 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3905 __slab_alloc_node mm/slub.c:3980 [inline] slab_alloc_node mm/slub.c:4141 [inline] __do_kmalloc_node mm/slub.c:4282 [inline] __kmalloc_noprof+0x2ac/0x530 mm/slub.c:4295 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1037 [inline] __acomp_request_alloc_noprof include/crypto/internal/acompress.h:75 [inline] acomp_request_alloc+0x46/0x110 crypto/acompress.c:131 zswap_cpu_comp_prepare+0x1f4/0x470 mm/zswap.c:840 cpuhp_invoke_callback+0x26d/0x9d0 kernel/cpu.c:204 cpuhp_issue_call+0x1c1/0x8d0 kernel/cpu.c:2375 __cpuhp_state_add_instance_cpuslocked+0x26a/0x3c0 kernel/cpu.c:2437 __cpuhp_state_add_instance+0xd7/0x2e0 kernel/cpu.c:2458 cpuhp_state_add_instance include/linux/cpuhotplug.h:386 [inline] zswap_pool_create+0x2c3/0x5c0 mm/zswap.c:288 __zswap_pool_create_fallback mm/zswap.c:356 [inline] zswap_setup+0x3a5/0x820 mm/zswap.c:1781 page last free pid 54 tgid 54 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_unref_page+0x714/0x10c0 mm/page_alloc.c:2657 vfree+0x17e/0x890 mm/vmalloc.c:3382 delayed_vfree_work+0x57/0x70 mm/vmalloc.c:3303 process_one_work+0x9a2/0x1ba0 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x677/0xe90 kernel/workqueue.c:3391 kthread+0x2ca/0x3b0 kernel/kthread.c:389 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Memory state around the buggy address: ffff888027873f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888027873f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888027874000: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff888027874080: 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc ffff888027874100: 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc ================================================================== We also find a similar bug report in function zswap_store(), listed as below: ================================================================== BUG: KASAN: slab-use-after-free in zswap_compress mm/zswap.c:925 [inline] BUG: KASAN: slab-use-after-free in zswap_store_page mm/zswap.c:1426 [inline] BUG: KASAN: slab-use-after-free in zswap_store+0x2307/0x25e0 mm/zswap.c:1533 Read of size 4 at addr ffff8880219f6b44 by task kswapd0/88 CPU: 1 UID: 0 PID: 88 Comm: kswapd0 Tainted: G U 6.12.0-09435-g2c22dc1ee3a1 #11 Tainted: [U]=USER Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.1-0-g3208b098f51a-prebuilt.qemu.org 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1b0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xc0/0x5e0 mm/kasan/report.c:489 kasan_report+0xbd/0xf0 mm/kasan/report.c:602 zswap_compress mm/zswap.c:925 [inline] zswap_store_page mm/zswap.c:1426 [inline] zswap_store+0x2307/0x25e0 mm/zswap.c:1533 swap_writepage+0x3a8/0xe50 mm/page_io.c:279 pageout+0x3b9/0xa90 mm/vmscan.c:689 shrink_folio_list+0x2988/0x4340 mm/vmscan.c:1367 evict_folios+0x72b/0x1a10 mm/vmscan.c:4593 try_to_shrink_lruvec+0x62b/0xa60 mm/vmscan.c:4789 shrink_one+0x417/0x7c0 mm/vmscan.c:4834 shrink_many mm/vmscan.c:4897 [inline] lru_gen_shrink_node mm/vmscan.c:4975 [inline] shrink_node+0x269a/0x3d60 mm/vmscan.c:5956 kswapd_shrink_node mm/vmscan.c:6785 [inline] balance_pgdat+0xbe5/0x18c0 mm/vmscan.c:6977 kswapd+0x6ff/0xd60 mm/vmscan.c:7246 kthread+0x2ca/0x3b0 kernel/kthread.c:389 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Allocated by task 1: kasan_save_stack+0x24/0x50 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4283 [inline] __kmalloc_noprof+0x212/0x530 mm/slub.c:4295 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1037 [inline] __acomp_request_alloc_noprof include/crypto/internal/acompress.h:75 [inline] acomp_request_alloc+0x46/0x110 crypto/acompress.c:131 zswap_cpu_comp_prepare+0x1f4/0x470 mm/zswap.c:840 cpuhp_invoke_callback+0x26d/0x9d0 kernel/cpu.c:204 cpuhp_issue_call+0x1c1/0x8d0 kernel/cpu.c:2375 __cpuhp_state_add_instance_cpuslocked+0x26a/0x3c0 kernel/cpu.c:2437 __cpuhp_state_add_instance+0xd7/0x2e0 kernel/cpu.c:2458 cpuhp_state_add_instance include/linux/cpuhotplug.h:386 [inline] zswap_pool_create+0x2c3/0x5c0 mm/zswap.c:288 __zswap_pool_create_fallback mm/zswap.c:356 [inline] zswap_setup+0x3a5/0x820 mm/zswap.c:1781 zswap_init+0x2d/0x40 mm/zswap.c:1817 do_one_initcall+0x111/0x6d0 init/main.c:1266 do_initcall_level init/main.c:1328 [inline] do_initcalls init/main.c:1344 [inline] do_basic_setup init/main.c:1363 [inline] kernel_init_freeable+0x5ae/0x8a0 init/main.c:1577 kernel_init+0x1e/0x2d0 init/main.c:1466 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Freed by task 901: kasan_save_stack+0x24/0x50 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:582 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x54/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2338 [inline] slab_free mm/slub.c:4598 [inline] kfree+0x14e/0x4d0 mm/slub.c:4746 zswap_cpu_comp_dead+0xe3/0x1c0 mm/zswap.c:874 cpuhp_invoke_callback+0x564/0x9d0 kernel/cpu.c:216 __cpuhp_invoke_callback_range+0x104/0x220 kernel/cpu.c:965 cpuhp_invoke_callback_range kernel/cpu.c:989 [inline] cpuhp_down_callbacks kernel/cpu.c:1382 [inline] _cpu_down+0x41d/0xef0 kernel/cpu.c:1443 __cpu_down_maps_locked+0x6f/0x90 kernel/cpu.c:1473 work_for_cpu_fn+0x55/0xa0 kernel/workqueue.c:6719 process_one_work+0x9a2/0x1ba0 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x677/0xe90 kernel/workqueue.c:3391 kthread+0x2ca/0x3b0 kernel/kthread.c:389 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 The buggy address belongs to the object at ffff8880219f6b00 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 68 bytes inside of freed 96-byte region [ffff8880219f6b00, ffff8880219f6b60) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x219f6 anon flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff88801b041280 ffffea0000887d00 dead000000000005 raw: 0000000000000000 0000000000200020 00000001f5000000 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 1, tgid 1 (swapper/0), ts 15792736110, free_ts 14433067061 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2e7/0x350 mm/page_alloc.c:1556 prep_new_page mm/page_alloc.c:1564 [inline] get_page_from_freelist+0xe4e/0x2b20 mm/page_alloc.c:3474 __alloc_pages_noprof+0x219/0x21f0 mm/page_alloc.c:4751 alloc_pages_mpol_noprof+0x2b6/0x600 mm/mempolicy.c:2265 alloc_slab_page mm/slub.c:2408 [inline] allocate_slab mm/slub.c:2574 [inline] new_slab+0x2d5/0x420 mm/slub.c:2627 ___slab_alloc+0xbb7/0x1850 mm/slub.c:3815 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3905 __slab_alloc_node mm/slub.c:3980 [inline] slab_alloc_node mm/slub.c:4141 [inline] __kmalloc_cache_noprof+0x280/0x410 mm/slub.c:4309 kmalloc_noprof include/linux/slab.h:901 [inline] kzalloc_noprof include/linux/slab.h:1037 [inline] usb_hub_create_port_device+0xbb/0xde0 drivers/usb/core/port.c:743 hub_configure drivers/usb/core/hub.c:1710 [inline] hub_probe+0x1ceb/0x2fc0 drivers/usb/core/hub.c:1965 usb_probe_interface+0x314/0x9f0 drivers/usb/core/driver.c:399 call_driver_probe drivers/base/dd.c:579 [inline] really_probe+0x252/0xa90 drivers/base/dd.c:658 __driver_probe_device+0x1df/0x450 drivers/base/dd.c:800 driver_probe_device+0x4c/0x1a0 drivers/base/dd.c:830 __device_attach_driver+0x1db/0x2f0 drivers/base/dd.c:958 bus_for_each_drv+0x14c/0x1d0 drivers/base/bus.c:459 page last free pid 25 tgid 25 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_unref_page+0x714/0x10c0 mm/page_alloc.c:2657 vfree+0x17e/0x890 mm/vmalloc.c:3382 delayed_vfree_work+0x57/0x70 mm/vmalloc.c:3303 process_one_work+0x9a2/0x1ba0 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x677/0xe90 kernel/workqueue.c:3391 kthread+0x2ca/0x3b0 kernel/kthread.c:389 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Memory state around the buggy address: ffff8880219f6a00: 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc ffff8880219f6a80: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc >ffff8880219f6b00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff8880219f6b80: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc ffff8880219f6c00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ================================================================== If you have any questions, please contact us. Best Regards, Yue