================================================================== BUG: KASAN: use-after-free in cipso_v4_doi_search net/ipv4/cipso_ipv4.c:363 [inline] BUG: KASAN: use-after-free in cipso_v4_doi_add+0x4e0/0x7c0 net/ipv4/cipso_ipv4.c:420 Read of size 4 at addr ffff88803f6a5a00 by task syz-executor.3/14359 CPU: 1 PID: 14359 Comm: syz-executor.3 Not tainted 5.15.0-rc5-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+0x1dc/0x2d8 lib/dump_stack.c:106 print_address_description+0x66/0x3e0 mm/kasan/report.c:256 __kasan_report mm/kasan/report.c:442 [inline] kasan_report+0x19a/0x1f0 mm/kasan/report.c:459 cipso_v4_doi_search net/ipv4/cipso_ipv4.c:363 [inline] cipso_v4_doi_add+0x4e0/0x7c0 net/ipv4/cipso_ipv4.c:420 smk_cipso_doi+0x2d3/0x580 security/smack/smackfs.c:706 smk_write_doi+0x1ab/0x270 security/smack/smackfs.c:1615 vfs_write+0x327/0xe90 fs/read_write.c:592 ksys_write+0x18f/0x2c0 fs/read_write.c:647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f31447cba39 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:00007f3141d41188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f31448cef60 RCX: 00007f31447cba39 RDX: 0000000000000014 RSI: 0000000020000640 RDI: 0000000000000003 RBP: 00007f3144825c5f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd5bc3df9f R14: 00007f3141d41300 R15: 0000000000022000 Allocated by task 14339: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc+0xdc/0x110 mm/kasan/common.c:513 kasan_kmalloc include/linux/kasan.h:264 [inline] kmem_cache_alloc_trace+0x9f/0x310 mm/slub.c:3233 kmalloc include/linux/slab.h:591 [inline] smk_cipso_doi+0x200/0x580 security/smack/smackfs.c:696 smk_write_doi+0x1ab/0x270 security/smack/smackfs.c:1615 vfs_write+0x327/0xe90 fs/read_write.c:592 ksys_write+0x18f/0x2c0 fs/read_write.c:647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 14339: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:46 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360 ____kasan_slab_free+0x10d/0x150 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1700 [inline] slab_free_freelist_hook+0x129/0x1a0 mm/slub.c:1725 slab_free mm/slub.c:3483 [inline] kfree+0xcf/0x2f0 mm/slub.c:4543 smk_cipso_doi+0x3b7/0x580 smk_write_doi+0x1ab/0x270 security/smack/smackfs.c:1615 vfs_write+0x327/0xe90 fs/read_write.c:592 ksys_write+0x18f/0x2c0 fs/read_write.c:647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff88803f6a5a00 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 0 bytes inside of 64-byte region [ffff88803f6a5a00, ffff88803f6a5a40) The buggy address belongs to the page: page:ffffea0000fda940 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3f6a5 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea0000866240 000000170000000d ffff888011041640 raw: 0000000000000000 0000000000200020 00000001ffffffff 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 6522, ts 209857791495, free_ts 209857731843 prep_new_page mm/page_alloc.c:2424 [inline] get_page_from_freelist+0x779/0xa30 mm/page_alloc.c:4153 __alloc_pages+0x255/0x580 mm/page_alloc.c:5375 alloc_slab_page mm/slub.c:1763 [inline] allocate_slab+0xcc/0x4d0 mm/slub.c:1900 new_slab mm/slub.c:1963 [inline] ___slab_alloc+0x41e/0xc40 mm/slub.c:2994 __slab_alloc mm/slub.c:3081 [inline] slab_alloc_node mm/slub.c:3172 [inline] kmem_cache_alloc_node_trace+0x2c4/0x350 mm/slub.c:3256 kmalloc_node include/linux/slab.h:609 [inline] kzalloc_node include/linux/slab.h:732 [inline] __get_vm_area_node+0x13a/0x2f0 mm/vmalloc.c:2416 __vmalloc_node_range+0xe3/0x890 mm/vmalloc.c:3010 __vmalloc_node mm/vmalloc.c:3069 [inline] vzalloc+0x75/0x80 mm/vmalloc.c:3139 alloc_counters+0xd2/0x800 net/ipv6/netfilter/ip6_tables.c:817 copy_entries_to_user net/ipv6/netfilter/ip6_tables.c:839 [inline] get_entries net/ipv6/netfilter/ip6_tables.c:1041 [inline] do_ip6t_get_ctl+0xf57/0x1f40 net/ipv6/netfilter/ip6_tables.c:1672 nf_getsockopt+0x2ab/0x2d0 net/netfilter/nf_sockopt.c:116 ipv6_getsockopt+0x4ae/0x3f30 net/ipv6/ipv6_sockglue.c:1486 __sys_getsockopt+0x29f/0x560 net/socket.c:2220 __do_sys_getsockopt net/socket.c:2235 [inline] __se_sys_getsockopt net/socket.c:2232 [inline] __x64_sys_getsockopt+0xb1/0xc0 net/socket.c:2232 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae 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+0xc29/0xd20 mm/page_alloc.c:1389 free_unref_page_prepare mm/page_alloc.c:3315 [inline] free_unref_page+0x7d/0x580 mm/page_alloc.c:3394 __vunmap+0x926/0xa70 mm/vmalloc.c:2621 copy_entries_to_user net/ipv6/netfilter/ip6_tables.c:884 [inline] get_entries net/ipv6/netfilter/ip6_tables.c:1041 [inline] do_ip6t_get_ctl+0x186d/0x1f40 net/ipv6/netfilter/ip6_tables.c:1672 nf_getsockopt+0x2ab/0x2d0 net/netfilter/nf_sockopt.c:116 ipv6_getsockopt+0x4ae/0x3f30 net/ipv6/ipv6_sockglue.c:1486 __sys_getsockopt+0x29f/0x560 net/socket.c:2220 __do_sys_getsockopt net/socket.c:2235 [inline] __se_sys_getsockopt net/socket.c:2232 [inline] __x64_sys_getsockopt+0xb1/0xc0 net/socket.c:2232 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Memory state around the buggy address: ffff88803f6a5900: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88803f6a5980: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff88803f6a5a00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff88803f6a5a80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88803f6a5b00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================