bisecting fixing commit since 78e709522d2c012cb0daad2e668506637bffb7c2 building syzkaller on 5ae8508a2dd5f8e16a2b9830ae9a6f37d54ec8e7 testing commit 78e709522d2c012cb0daad2e668506637bffb7c2 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: a9ee8b045e5ead72fbe14b5ba3f27f4e7dade83d639c18306638c2a676910138 run #0: crashed: KASAN: use-after-free Write in null_skcipher_crypt run #1: crashed: KASAN: use-after-free Write in null_skcipher_crypt run #2: crashed: KASAN: slab-out-of-bounds Write in null_skcipher_crypt run #3: crashed: KASAN: slab-out-of-bounds Write in null_skcipher_crypt run #4: crashed: KASAN: use-after-free Write in null_skcipher_crypt run #5: crashed: KASAN: use-after-free Write in null_skcipher_crypt run #6: crashed: KASAN: use-after-free Write in null_skcipher_crypt run #7: crashed: KASAN: slab-out-of-bounds Write in null_skcipher_crypt run #8: crashed: KASAN: use-after-free Write in null_skcipher_crypt run #9: crashed: KASAN: use-after-free Write in null_skcipher_crypt run #10: crashed: KASAN: use-after-free Write in null_skcipher_crypt run #11: crashed: KASAN: use-after-free Write in null_skcipher_crypt run #12: crashed: KASAN: use-after-free Write in null_skcipher_crypt run #13: crashed: KASAN: use-after-free Write in null_skcipher_crypt run #14: crashed: KASAN: slab-out-of-bounds Write in null_skcipher_crypt run #15: crashed: KASAN: use-after-free Write in null_skcipher_crypt run #16: crashed: KASAN: use-after-free Write in null_skcipher_crypt run #17: crashed: KASAN: use-after-free Write in null_skcipher_crypt run #18: crashed: KASAN: slab-out-of-bounds Write in null_skcipher_crypt run #19: crashed: KASAN: use-after-free Read in skb_copy_bits testing current HEAD daadb3bd0e8d3e317e36bc2c1542e86c528665e5 testing commit daadb3bd0e8d3e317e36bc2c1542e86c528665e5 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 8547bef86bd5b428c889c67e0246e658dca5eda5c9cc901cd4c62dd560acf498 run #0: crashed: KASAN: use-after-free Write in null_skcipher_crypt run #1: crashed: KASAN: use-after-free Write in null_skcipher_crypt run #2: crashed: KASAN: use-after-free Write in null_skcipher_crypt run #3: crashed: KASAN: slab-out-of-bounds Write in null_skcipher_crypt run #4: crashed: KASAN: use-after-free Write in null_skcipher_crypt run #5: crashed: KASAN: use-after-free Write in null_skcipher_crypt run #6: crashed: KASAN: use-after-free Write in null_skcipher_crypt run #7: crashed: KASAN: use-after-free Write in null_skcipher_crypt run #8: crashed: KASAN: use-after-free Write in null_skcipher_crypt run #9: crashed: KASAN: use-after-free Write in null_skcipher_crypt revisions tested: 2, total time: 21m24.043250042s (build: 14m16.104330175s, test: 6m17.790100729s) the crash still happens on HEAD commit msg: Merge tag 'locking_core_for_v5.17_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip crash: KASAN: use-after-free Write in null_skcipher_crypt ================================================================== BUG: KASAN: use-after-free in memcpy include/linux/fortify-string.h:225 [inline] BUG: KASAN: use-after-free in null_skcipher_crypt+0x8f/0xf0 crypto/crypto_null.c:85 Write of size 4096 at addr ffff888075e08000 by task syz-executor.2/4000 CPU: 1 PID: 4000 Comm: syz-executor.2 Not tainted 5.16.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x57/0x7d lib/dump_stack.c:106 print_address_description.constprop.0.cold+0x8d/0x336 mm/kasan/report.c:255 __kasan_report mm/kasan/report.c:442 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:459 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0x13d/0x180 mm/kasan/generic.c:189 memcpy+0x39/0x60 mm/kasan/shadow.c:66 memcpy include/linux/fortify-string.h:225 [inline] null_skcipher_crypt+0x8f/0xf0 crypto/crypto_null.c:85 crypto_authenc_encrypt+0x38b/0x530 crypto/authenc.c:222 esp6_output_tail+0x6de/0x1b60 net/ipv6/esp6.c:658 esp6_output+0x45d/0x910 net/ipv6/esp6.c:734 xfrm_output_one net/xfrm/xfrm_output.c:553 [inline] xfrm_output_resume+0x519/0x61b0 net/xfrm/xfrm_output.c:588 NF_HOOK_COND include/linux/netfilter.h:296 [inline] xfrm6_output+0xe3/0x410 net/ipv6/xfrm6_output.c:92 ip6_send_skb+0x8f/0x2f0 net/ipv6/ip6_output.c:1912 rawv6_push_pending_frames net/ipv6/raw.c:613 [inline] rawv6_sendmsg+0x21bd/0x30b0 net/ipv6/raw.c:956 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg+0xab/0xe0 net/socket.c:725 ____sys_sendmsg+0x5bf/0x7a0 net/socket.c:2413 ___sys_sendmsg+0xd3/0x150 net/socket.c:2467 __sys_sendmsg+0xb2/0x140 net/socket.c:2496 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665f9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fb86c9af188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665f9 RDX: 0000000000000000 RSI: 0000000020000500 RDI: 0000000000000004 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 0000000000a9fb1f R14: 00007fb86c9af300 R15: 0000000000022000 The buggy address belongs to the page: page:ffffea0001d78200 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x75e08 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000000 ffffea0001d8c808 ffffea00005ecc08 0000000000000000 raw: 0000000000000000 0000000000040000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as freed page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 3484, ts 34622400014, free_ts 64319224045 prep_new_page mm/page_alloc.c:2418 [inline] get_page_from_freelist+0xa6f/0x2f10 mm/page_alloc.c:4149 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5369 alloc_slab_page mm/slub.c:1799 [inline] allocate_slab mm/slub.c:1944 [inline] new_slab+0x28a/0x3b0 mm/slub.c:2004 ___slab_alloc+0x87e/0xe80 mm/slub.c:3018 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3105 slab_alloc_node mm/slub.c:3196 [inline] slab_alloc mm/slub.c:3238 [inline] __kmalloc+0x2fb/0x340 mm/slub.c:4420 kmalloc include/linux/slab.h:587 [inline] tomoyo_realpath_from_path+0xb0/0x6a0 security/tomoyo/realpath.c:254 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_number_perm+0x1a6/0x4d0 security/tomoyo/file.c:723 tomoyo_path_mknod+0xb5/0x130 security/tomoyo/tomoyo.c:239 security_path_mknod+0xc8/0x140 security/security.c:1125 may_o_create fs/namei.c:3101 [inline] lookup_open.isra.0+0x3c9/0x1770 fs/namei.c:3243 open_last_lookups fs/namei.c:3350 [inline] path_openat+0x7e4/0x2390 fs/namei.c:3556 do_filp_open+0x199/0x3d0 fs/namei.c:3586 do_sys_openat2+0x11e/0x400 fs/open.c:1214 do_sys_open fs/open.c:1230 [inline] __do_sys_openat fs/open.c:1246 [inline] __se_sys_openat fs/open.c:1241 [inline] __x64_sys_openat+0x11b/0x1d0 fs/open.c:1241 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1338 [inline] free_pcp_prepare+0x374/0x870 mm/page_alloc.c:1389 free_unref_page_prepare mm/page_alloc.c:3309 [inline] free_unref_page+0x19/0x690 mm/page_alloc.c:3388 __unfreeze_partials+0x320/0x340 mm/slub.c:2536 qlink_free mm/kasan/quarantine.c:146 [inline] qlist_free_all+0x5e/0xf0 mm/kasan/quarantine.c:165 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:272 __kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:447 kasan_slab_alloc include/linux/kasan.h:260 [inline] slab_post_alloc_hook mm/slab.h:738 [inline] slab_alloc_node mm/slub.c:3230 [inline] slab_alloc mm/slub.c:3238 [inline] __kmalloc+0x1e7/0x340 mm/slub.c:4420 kmalloc include/linux/slab.h:587 [inline] tomoyo_add_entry security/tomoyo/common.c:2031 [inline] tomoyo_supervisor+0xa4b/0xc40 security/tomoyo/common.c:2103 tomoyo_audit_path_number_log security/tomoyo/file.c:235 [inline] tomoyo_path_number_perm+0x38a/0x4d0 security/tomoyo/file.c:734 security_file_ioctl+0x44/0x80 security/security.c:1533 __do_sys_ioctl fs/ioctl.c:868 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __x64_sys_ioctl+0x99/0x190 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Memory state around the buggy address: ffff888075e07f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888075e07f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888075e08000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff888075e08080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888075e08100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================