================================================================== BUG: KASAN: use-after-free in __crypto_xor+0x376/0x410 crypto/algapi.c:1001 Read of size 8 at addr ffff888065f6d8bc by task syz-executor.2/10400 CPU: 0 PID: 10400 Comm: syz-executor.2 Not tainted 5.14.0-rc3-next-20210730-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+0xcd/0x134 lib/dump_stack.c:105 print_address_description.constprop.0.cold+0x6c/0x309 mm/kasan/report.c:256 __kasan_report mm/kasan/report.c:442 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:459 __crypto_xor+0x376/0x410 crypto/algapi.c:1001 crypto_xor include/crypto/algapi.h:160 [inline] crypto_ctr_crypt_segment crypto/ctr.c:60 [inline] crypto_ctr_crypt+0x256/0x550 crypto/ctr.c:114 crypto_skcipher_encrypt+0xaa/0xf0 crypto/skcipher.c:630 crypto_gcm_encrypt+0x38f/0x4b0 crypto/gcm.c:461 crypto_aead_encrypt+0xaa/0xf0 crypto/aead.c:94 pcrypt_aead_enc+0x13/0x70 crypto/pcrypt.c:82 padata_do_parallel+0x754/0x8b0 kernel/padata.c:230 pcrypt_aead_encrypt+0x39f/0x4d0 crypto/pcrypt.c:115 crypto_aead_encrypt+0xaa/0xf0 crypto/aead.c:94 pcrypt_aead_enc+0x13/0x70 crypto/pcrypt.c:82 padata_do_parallel+0x754/0x8b0 kernel/padata.c:230 pcrypt_aead_encrypt+0x39f/0x4d0 crypto/pcrypt.c:115 crypto_aead_encrypt+0xaa/0xf0 crypto/aead.c:94 tls_do_encryption net/tls/tls_sw.c:529 [inline] tls_push_record+0x13d7/0x31c0 net/tls/tls_sw.c:762 bpf_exec_tx_verdict+0xd82/0x11a0 net/tls/tls_sw.c:802 tls_sw_do_sendpage+0xa20/0xf80 net/tls/tls_sw.c:1214 tls_sw_sendpage+0x9d/0xe0 net/tls/tls_sw.c:1278 inet_sendpage+0xd0/0x140 net/ipv4/af_inet.c:835 kernel_sendpage.part.0+0x1a0/0x340 net/socket.c:3496 kernel_sendpage net/socket.c:3493 [inline] sock_sendpage+0xe5/0x140 net/socket.c:1003 pipe_to_sendpage+0x2ad/0x380 fs/splice.c:364 splice_from_pipe_feed fs/splice.c:418 [inline] __splice_from_pipe+0x43e/0x8a0 fs/splice.c:562 splice_from_pipe fs/splice.c:597 [inline] generic_splice_sendpage+0xd4/0x140 fs/splice.c:746 do_splice_from fs/splice.c:767 [inline] direct_splice_actor+0x110/0x180 fs/splice.c:936 splice_direct_to_actor+0x34b/0x8c0 fs/splice.c:891 do_splice_direct+0x1b3/0x280 fs/splice.c:979 do_sendfile+0x9f0/0x1120 fs/read_write.c:1260 __do_sys_sendfile64 fs/read_write.c:1325 [inline] __se_sys_sendfile64 fs/read_write.c:1311 [inline] __x64_sys_sendfile64+0x1cc/0x210 fs/read_write.c:1311 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: 0033:0x4665e9 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:00007f6223a99188 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 000000000056c038 RCX: 00000000004665e9 RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000008 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000800100020001 R11: 0000000000000246 R12: 000000000056c038 R13: 00007ffc38e5ff1f R14: 00007f6223a99300 R15: 0000000000022000 The buggy address belongs to the page: page:ffffea000197db40 refcount:0 mapcount:0 mapping:0000000000000000 index:0x100 pfn:0x65f6d flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000000 dead000000000100 dead000000000122 0000000000000000 raw: 0000000000000100 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as freed page last allocated via order 0, migratetype Movable, gfp_mask 0x1100dca(GFP_HIGHUSER_MOVABLE|__GFP_ZERO), pid 27644, ts 649717107716, free_ts 662337158027 prep_new_page mm/page_alloc.c:2424 [inline] get_page_from_freelist+0xa72/0x2f80 mm/page_alloc.c:4152 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5374 alloc_pages_vma+0xf3/0x760 mm/mempolicy.c:2136 wp_page_copy+0xec8/0x2280 mm/memory.c:2998 do_wp_page+0x2cb/0x1ae0 mm/memory.c:3313 handle_pte_fault mm/memory.c:4578 [inline] __handle_mm_fault+0x1f40/0x5150 mm/memory.c:4695 handle_mm_fault+0x1c8/0x790 mm/memory.c:4793 do_user_addr_fault+0x48b/0x11c0 arch/x86/mm/fault.c:1390 handle_page_fault arch/x86/mm/fault.c:1475 [inline] exc_page_fault+0x9e/0x180 arch/x86/mm/fault.c:1531 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:568 __put_user_nocheck_4+0x3/0x11 ____sys_recvmsg+0x3a5/0x600 net/socket.c:2635 ___sys_recvmsg+0x127/0x200 net/socket.c:2664 do_recvmmsg+0x24d/0x6d0 net/socket.c:2758 __sys_recvmmsg net/socket.c:2837 [inline] __do_sys_recvmmsg net/socket.c:2860 [inline] __se_sys_recvmmsg net/socket.c:2853 [inline] __x64_sys_recvmmsg+0x20b/0x260 net/socket.c:2853 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+0x373/0x860 mm/page_alloc.c:1389 free_unref_page_prepare mm/page_alloc.c:3315 [inline] free_unref_page_list+0x1a1/0x1050 mm/page_alloc.c:3431 release_pages+0x3f4/0x1480 mm/swap.c:979 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline] tlb_flush_mmu_free mm/mmu_gather.c:242 [inline] tlb_flush_mmu+0xe9/0x6b0 mm/mmu_gather.c:249 zap_pte_range mm/memory.c:1432 [inline] zap_pmd_range mm/memory.c:1481 [inline] zap_pud_range mm/memory.c:1510 [inline] zap_p4d_range mm/memory.c:1531 [inline] unmap_page_range+0x1c58/0x2a10 mm/memory.c:1552 unmap_single_vma+0x198/0x310 mm/memory.c:1597 unmap_vmas+0x16d/0x2f0 mm/memory.c:1629 exit_mmap+0x1d0/0x620 mm/mmap.c:3201 __mmput+0x122/0x470 kernel/fork.c:1152 mmput+0x58/0x60 kernel/fork.c:1173 exit_mm kernel/exit.c:501 [inline] do_exit+0xae2/0x2a60 kernel/exit.c:812 do_group_exit+0x125/0x310 kernel/exit.c:922 get_signal+0x47f/0x2160 kernel/signal.c:2831 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:865 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:209 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302 Memory state around the buggy address: ffff888065f6d780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888065f6d800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff888065f6d880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff888065f6d900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888065f6d980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================