================================================================== BUG: KASAN: use-after-free in memcpy include/linux/string.h:347 [inline] BUG: KASAN: use-after-free in memcpy_dir crypto/scatterwalk.c:28 [inline] BUG: KASAN: use-after-free in scatterwalk_copychunks+0x260/0x6b0 crypto/scatterwalk.c:43 Read of size 4096 at addr ffff8880682c7000 by task syz-executor.0/8867 CPU: 1 PID: 8867 Comm: syz-executor.0 Not tainted 4.14.113 #3 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x138/0x19c lib/dump_stack.c:53 print_address_description.cold+0x7c/0x1dc mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report mm/kasan/report.c:409 [inline] kasan_report.cold+0xaf/0x2b5 mm/kasan/report.c:393 check_memory_region_inline mm/kasan/kasan.c:260 [inline] check_memory_region+0x123/0x190 mm/kasan/kasan.c:267 memcpy+0x24/0x50 mm/kasan/kasan.c:302 memcpy include/linux/string.h:347 [inline] memcpy_dir crypto/scatterwalk.c:28 [inline] scatterwalk_copychunks+0x260/0x6b0 crypto/scatterwalk.c:43 scatterwalk_map_and_copy crypto/scatterwalk.c:72 [inline] scatterwalk_map_and_copy+0x12f/0x1d0 crypto/scatterwalk.c:60 gcmaes_encrypt.constprop.0+0x1d2/0xb90 arch/x86/crypto/aesni-intel_glue.c:778 generic_gcmaes_encrypt+0xf4/0x130 arch/x86/crypto/aesni-intel_glue.c:1111 crypto_aead_encrypt include/crypto/aead.h:330 [inline] gcmaes_wrapper_encrypt+0x101/0x170 arch/x86/crypto/aesni-intel_glue.c:945 crypto_aead_encrypt include/crypto/aead.h:330 [inline] tls_do_encryption net/tls/tls_sw.c:234 [inline] tls_push_record+0x90b/0x1210 net/tls/tls_sw.c:270 tls_sw_sendpage+0x437/0xb50 net/tls/tls_sw.c:617 inet_sendpage+0x15a/0x580 net/ipv4/af_inet.c:779 kernel_sendpage+0x95/0xf0 net/socket.c:3415 sock_sendpage+0x8b/0xc0 net/socket.c:871 pipe_to_sendpage+0x244/0x340 fs/splice.c:451 splice_from_pipe_feed fs/splice.c:502 [inline] __splice_from_pipe+0x351/0x790 fs/splice.c:626 splice_from_pipe+0xf0/0x150 fs/splice.c:661 generic_splice_sendpage+0x3c/0x50 fs/splice.c:832 do_splice_from fs/splice.c:851 [inline] direct_splice_actor+0x126/0x1a0 fs/splice.c:1018 splice_direct_to_actor+0x2a1/0x7b0 fs/splice.c:973 do_splice_direct+0x18d/0x230 fs/splice.c:1061 do_sendfile+0x4db/0xbd0 fs/read_write.c:1440 SYSC_sendfile64 fs/read_write.c:1501 [inline] SyS_sendfile64+0x102/0x110 fs/read_write.c:1487 do_syscall_64+0x1eb/0x630 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x458c29 RSP: 002b:00007f905dd34c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f905dd34c90 RCX: 0000000000458c29 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000003 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000006785 R11: 0000000000000246 R12: 00007f905dd356d4 R13: 00000000004c5e10 R14: 00000000004da5c8 R15: 0000000000000005 Allocated by task 7041: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x45/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc mm/kasan/kasan.c:551 [inline] kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:529 kasan_slab_alloc+0xf/0x20 mm/kasan/kasan.c:489 kmem_cache_alloc+0x12e/0x780 mm/slab.c:3552 dup_mmap kernel/fork.c:652 [inline] dup_mm kernel/fork.c:1199 [inline] copy_mm kernel/fork.c:1253 [inline] copy_process.part.0+0x440d/0x6950 kernel/fork.c:1755 copy_process kernel/fork.c:1570 [inline] _do_fork+0x19e/0xce0 kernel/fork.c:2058 SYSC_clone kernel/fork.c:2168 [inline] SyS_clone+0x37/0x50 kernel/fork.c:2162 do_syscall_64+0x1eb/0x630 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 Freed by task 8107: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x45/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0x75/0xc0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kmem_cache_free+0x83/0x2b0 mm/slab.c:3758 remove_vma+0x164/0x1b0 mm/mmap.c:176 exit_mmap+0x314/0x4e0 mm/mmap.c:3068 __mmput kernel/fork.c:926 [inline] mmput+0x114/0x440 kernel/fork.c:947 exec_mmap fs/exec.c:1039 [inline] flush_old_exec+0x8c0/0x1b50 fs/exec.c:1271 load_elf_binary+0x88e/0x4ba0 fs/binfmt_elf.c:855 search_binary_handler fs/exec.c:1638 [inline] search_binary_handler+0x14f/0x700 fs/exec.c:1616 exec_binprm fs/exec.c:1680 [inline] do_execveat_common.isra.0+0xffd/0x1dd0 fs/exec.c:1802 do_execve fs/exec.c:1847 [inline] SYSC_execve fs/exec.c:1928 [inline] SyS_execve+0x39/0x50 fs/exec.c:1923 do_syscall_64+0x1eb/0x630 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 The buggy address belongs to the object at ffff8880682c7000 which belongs to the cache vm_area_struct of size 200 The buggy address is located 0 bytes inside of 200-byte region [ffff8880682c7000, ffff8880682c70c8) The buggy address belongs to the page: page:ffffea0001a0b1c0 count:1 mapcount:0 mapping:ffff8880682c7000 index:0x0 flags: 0x1fffc0000000100(slab) raw: 01fffc0000000100 ffff8880682c7000 0000000000000000 000000010000000f raw: ffffea0002a2bde0 ffffea00026373e0 ffff88821f830c40 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880682c6f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880682c6f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8880682c7000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880682c7080: fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc ffff8880682c7100: fc fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================