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================================================================== BUG: KASAN: use-after-free in memcpy include/linux/fortify-string.h:191 [inline] BUG: KASAN: use-after-free in page_to_skb+0x5cf/0xb70 drivers/net/virtio_net.c:480 Read of size 12 at addr ffff88802ed67800 by task ksoftirqd/1/19 CPU: 1 PID: 19 Comm: ksoftirqd/1 Not tainted 5.12.0-rc8-next-20210420-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x141/0x1d7 lib/dump_stack.c:120 print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:233 __kasan_report mm/kasan/report.c:419 [inline] kasan_report.cold+0x7c/0xd8 mm/kasan/report.c:436 check_region_inline mm/kasan/generic.c:180 [inline] kasan_check_range+0x13d/0x180 mm/kasan/generic.c:186 memcpy+0x20/0x60 mm/kasan/shadow.c:65 memcpy include/linux/fortify-string.h:191 [inline] page_to_skb+0x5cf/0xb70 drivers/net/virtio_net.c:480 receive_mergeable drivers/net/virtio_net.c:1009 [inline] receive_buf+0x2bc0/0x6250 drivers/net/virtio_net.c:1119 virtnet_receive drivers/net/virtio_net.c:1411 [inline] virtnet_poll+0x568/0x10b0 drivers/net/virtio_net.c:1516 __napi_poll+0xaf/0x440 net/core/dev.c:6962 napi_poll net/core/dev.c:7029 [inline] net_rx_action+0x801/0xb40 net/core/dev.c:7116 __do_softirq+0x29b/0x9fe kernel/softirq.c:559 run_ksoftirqd kernel/softirq.c:921 [inline] run_ksoftirqd+0x2d/0x60 kernel/softirq.c:913 smpboot_thread_fn+0x655/0x9e0 kernel/smpboot.c:165 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Allocated by task 6462: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:428 [inline] __kasan_slab_alloc+0x84/0xa0 mm/kasan/common.c:461 kasan_slab_alloc include/linux/kasan.h:236 [inline] slab_post_alloc_hook mm/slab.h:527 [inline] slab_alloc_node mm/slub.c:2924 [inline] slab_alloc mm/slub.c:2932 [inline] kmem_cache_alloc+0x219/0x3a0 mm/slub.c:2937 getname_flags.part.0+0x50/0x4f0 fs/namei.c:138 getname_flags fs/namei.c:2734 [inline] user_path_at_empty+0xa1/0x100 fs/namei.c:2734 user_path_at include/linux/namei.h:60 [inline] do_faccessat+0x127/0x850 fs/open.c:425 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 6462: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:357 ____kasan_slab_free mm/kasan/common.c:360 [inline] ____kasan_slab_free mm/kasan/common.c:325 [inline] __kasan_slab_free+0xfb/0x130 mm/kasan/common.c:368 kasan_slab_free include/linux/kasan.h:212 [inline] slab_free_hook mm/slub.c:1593 [inline] slab_free_freelist_hook+0xdf/0x240 mm/slub.c:1618 slab_free mm/slub.c:3178 [inline] kmem_cache_free+0x97/0x750 mm/slub.c:3194 putname+0xe1/0x120 fs/namei.c:259 filename_lookup+0x3c3/0x570 fs/namei.c:2464 user_path_at include/linux/namei.h:60 [inline] do_faccessat+0x127/0x850 fs/open.c:425 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff88802ed66600 which belongs to the cache names_cache of size 4096 The buggy address is located 512 bytes to the right of 4096-byte region [ffff88802ed66600, ffff88802ed67600) The buggy address belongs to the page: page:ffffea0000bb5800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2ed60 head:ffffea0000bb5800 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 dead000000000100 dead000000000122 ffff8880111bd280 raw: 0000000000000000 0000000000070007 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88802ed67700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802ed67780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88802ed67800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88802ed67880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802ed67900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================
Time | Kernel | Commit | Syzkaller | Config | Log | Report | Syz repro | C repro | VM info | Assets (help?) | Manager | Title |
---|---|---|---|---|---|---|---|---|---|---|---|---|
2021/04/21 08:15 | linux-next | 593ef1658ecf | 95777977 | .config | console log | report | ci-upstream-linux-next-kasan-gce-root | linux-next boot error: KASAN: use-after-free Read in page_to_skb | ||||
2021/04/21 08:15 | linux-next | 593ef1658ecf | 95777977 | .config | console log | report | ci-upstream-linux-next-kasan-gce-root | linux-next boot error: KASAN: use-after-free Read in page_to_skb | ||||
2021/04/20 10:57 | linux-next | 593ef1658ecf | c0ced557 | .config | console log | report | ci-upstream-linux-next-kasan-gce-root | linux-next boot error: KASAN: use-after-free Read in page_to_skb | ||||
2021/04/20 10:08 | linux-next | 593ef1658ecf | 4285c989 | .config | console log | report | ci-upstream-linux-next-kasan-gce-root | linux-next boot error: KASAN: use-after-free Read in page_to_skb | ||||
2021/04/19 22:36 | linux-next | 50b8b1d699ac | 4285c989 | .config | console log | report | ci-upstream-linux-next-kasan-gce-root | linux-next boot error: KASAN: use-after-free Read in page_to_skb | ||||
2021/04/19 11:04 | linux-next | 50b8b1d699ac | 50f523d7 | .config | console log | report | ci-upstream-linux-next-kasan-gce-root | linux-next boot error: KASAN: use-after-free Read in page_to_skb | ||||
2021/04/19 11:04 | linux-next | 50b8b1d699ac | 50f523d7 | .config | console log | report | ci-upstream-linux-next-kasan-gce-root | linux-next boot error: KASAN: use-after-free Read in page_to_skb |