KASAN: use-after-free Read in sock_has

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KASAN: use-after-free Read in sock_has_perm selinux	19				1	1107d	1102d	0/29	auto-obsoleted due to no activity on 2022/12/09 14:55
linux-4.14	KASAN: use-after-free Read in sock_has_perm	19				1	2062d	2062d	0/1	auto-closed as invalid on 2020/04/28 08:59

================================================================== BUG: KASAN: use-after-free in sock_has_perm+0x3f0/0x400 security/selinux/hooks.c:4064 Read of size 8 at addr ffff8801d29814f8 by task syz-executor7/13410 CPU: 1 PID: 13410 Comm: syz-executor7 Not tainted 4.4.125-g38f41ec #21 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 0000000000000000 7ffe728202d4fde7 ffff8801d28078b8 ffffffff81d067bd ffffea00074a6000 ffff8801d29814f8 0000000000000000 ffff8801d29814f8 ffff8801d28f9800 ffff8801d28078f0 ffffffff814fea83 ffff8801d29814f8 Call Trace: [<ffffffff81d067bd>] __dump_stack lib/dump_stack.c:15 [inline] [<ffffffff81d067bd>] dump_stack+0xc1/0x124 lib/dump_stack.c:51 [<ffffffff814fea83>] print_address_description+0x73/0x260 mm/kasan/report.c:252 [<ffffffff814fef95>] kasan_report_error mm/kasan/report.c:351 [inline] [<ffffffff814fef95>] kasan_report+0x285/0x370 mm/kasan/report.c:408 [<ffffffff814ff0f4>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429 [<ffffffff81b6aff0>] sock_has_perm+0x3f0/0x400 security/selinux/hooks.c:4064 [<ffffffff81b6b19f>] selinux_socket_sendmsg+0x3f/0x50 security/selinux/hooks.c:4325 [<ffffffff81b4967d>] security_socket_sendmsg+0x7d/0xb0 security/security.c:1231 [<ffffffff82df1603>] sock_sendmsg+0x43/0x110 net/socket.c:632 [<ffffffff82df3261>] ___sys_sendmsg+0x6c1/0x7c0 net/socket.c:1962 [<ffffffff82df52b3>] __sys_sendmsg+0xd3/0x190 net/socket.c:1996 [<ffffffff82ee01fa>] C_SYSC_sendmsg net/compat.c:720 [inline] [<ffffffff82ee01fa>] compat_SyS_sendmsg+0x2a/0x40 net/compat.c:718 [<ffffffff81006d91>] do_syscall_32_irqs_on arch/x86/entry/common.c:392 [inline] [<ffffffff81006d91>] do_fast_syscall_32+0x321/0x8a0 arch/x86/entry/common.c:459 [<ffffffff8377b2aa>] sysenter_flags_fixed+0xd/0x17 Allocated by task 13410: [<ffffffff81035d76>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63 [<ffffffff814fdaf3>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512 [<ffffffff814fddbd>] set_track mm/kasan/kasan.c:524 [inline] [<ffffffff814fddbd>] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:616 [<ffffffff814fa0a4>] __kmalloc+0x124/0x320 mm/slub.c:3613 [<ffffffff82df8d1c>] kmalloc include/linux/slab.h:481 [inline] [<ffffffff82df8d1c>] sk_prot_alloc+0x18c/0x310 net/core/sock.c:1354 [<ffffffff82dff03a>] sk_alloc+0x3a/0x3a0 net/core/sock.c:1419 [<ffffffff83467b43>] pppol2tp_create+0x33/0x1f0 net/l2tp/l2tp_ppp.c:551 [<ffffffff82800cc1>] pppox_create+0xf1/0x200 drivers/net/ppp/pppox.c:121 [<ffffffff82df3c6c>] __sock_create+0x3ac/0x640 net/socket.c:1177 [<ffffffff82df4130>] sock_create net/socket.c:1217 [inline] [<ffffffff82df4130>] SYSC_socket net/socket.c:1247 [inline] [<ffffffff82df4130>] SyS_socket+0xf0/0x1b0 net/socket.c:1227 [<ffffffff81006d91>] do_syscall_32_irqs_on arch/x86/entry/common.c:392 [inline] [<ffffffff81006d91>] do_fast_syscall_32+0x321/0x8a0 arch/x86/entry/common.c:459 [<ffffffff8377b2aa>] sysenter_flags_fixed+0xd/0x17 Freed by task 13416: [<ffffffff81035d76>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63 [<ffffffff814fdaf3>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512 [<ffffffff814fe412>] set_track mm/kasan/kasan.c:524 [inline] [<ffffffff814fe412>] kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:589 [<ffffffff814faeac>] slab_free_hook mm/slub.c:1383 [inline] [<ffffffff814faeac>] slab_free_freelist_hook mm/slub.c:1405 [inline] [<ffffffff814faeac>] slab_free mm/slub.c:2859 [inline] [<ffffffff814faeac>] kfree+0xfc/0x300 mm/slub.c:3749 [<ffffffff82e02c07>] sk_prot_free net/core/sock.c:1391 [inline] [<ffffffff82e02c07>] sk_destruct+0x3f7/0x4c0 net/core/sock.c:1472 [<ffffffff82e02d27>] __sk_free+0x57/0x230 net/core/sock.c:1480 [<ffffffff82e02f30>] sk_free+0x30/0x40 net/core/sock.c:1491 [<ffffffff8346b14f>] sock_put include/net/sock.h:1639 [inline] [<ffffffff8346b14f>] pppol2tp_session_sock_put+0x5f/0x70 net/l2tp/l2tp_ppp.c:286 [<ffffffff83463b44>] l2tp_tunnel_closeall+0x254/0x3b0 net/l2tp/l2tp_core.c:1277 [<ffffffff8346472b>] l2tp_udp_encap_destroy+0x8b/0xf0 net/l2tp/l2tp_core.c:1300 [<ffffffff833729c1>] udpv6_destroy_sock+0xb1/0xd0 net/ipv6/udp.c:1421 [<ffffffff82e048fb>] sk_common_release+0x6b/0x300 net/core/sock.c:2680 [<ffffffff83371975>] udp_lib_close+0x15/0x20 include/net/udp.h:190 [<ffffffff831d5eba>] inet_release+0xfa/0x1d0 net/ipv4/af_inet.c:435 [<ffffffff832fb320>] inet6_release+0x50/0x70 net/ipv6/af_inet6.c:424 [<ffffffff82ded7fd>] sock_release+0x8d/0x1e0 net/socket.c:586 [<ffffffff82ded966>] sock_close+0x16/0x20 net/socket.c:1037 [<ffffffff81523f43>] __fput+0x233/0x6d0 fs/file_table.c:208 [<ffffffff81524465>] ____fput+0x15/0x20 fs/file_table.c:244 [<ffffffff8118bd44>] task_work_run+0x104/0x180 kernel/task_work.c:115 [<ffffffff8100361d>] tracehook_notify_resume include/linux/tracehook.h:191 [inline] [<ffffffff8100361d>] exit_to_usermode_loop+0x13d/0x160 arch/x86/entry/common.c:252 [<ffffffff81007084>] prepare_exit_to_usermode arch/x86/entry/common.c:283 [inline] [<ffffffff81007084>] syscall_return_slowpath arch/x86/entry/common.c:348 [inline] [<ffffffff81007084>] do_syscall_32_irqs_on arch/x86/entry/common.c:398 [inline] [<ffffffff81007084>] do_fast_syscall_32+0x614/0x8a0 arch/x86/entry/common.c:459 [<ffffffff8377b2aa>] sysenter_flags_fixed+0xd/0x17 The buggy address belongs to the object at ffff8801d2981100 which belongs to the cache kmalloc-2048 of size 2048 The buggy address is located 1016 bytes inside of 2048-byte region [ffff8801d2981100, ffff8801d2981900) The buggy address belongs to the page: page:ffffea00074a6000 count:1 mapcount:-2146500592 mapping: (null) index:0x0 BUG: unable to handle kernel NULL pointer dereference at (null) IP: [< (null)>] (null) PGD 80000000ac76e067 PUD ac777067 PMD 0 Oops: 0010 [#1] PREEMPT SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.4.125-g38f41ec #21 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffffffff84217840 task.stack: ffffffff84200000 RIP: 0010:[<0000000000000000>] [< (null)>] (null) RSP: 0018:ffff8801db207df0 EFLAGS: 00010006 RAX: ffffffff84217840 RBX: ffff8801d26dfd28 RCX: ffffffff812adea0 RDX: 0000000000010000 RSI: ffffffff839fef20 RDI: ffff8801d26dfd28 RBP: ffff8801db207ee0 R08: 1ffff10016e8bba0 R09: 0000000000000001 R10: 0000000000000000 R11: 1ffff1003b640f6a R12: 0000000000000000 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8801db219640 FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 00000000ac75e000 CR4: 0000000000160670 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: ffffffff812adea6 ffff88021fffd017 ffff88021fffd01b ffff88021fffd00f 1ffff1003b640fcb ffff8801db2196a0 ffffed003b640fca ffff8801db219700 0303fc0000000001 ffff8801db219678 ffffed003b6432d4 ffff8801db219718 Call Trace: <IRQ> [<ffffffff812b0386>] hrtimer_interrupt+0x1a6/0x440 kernel/time/hrtimer.c:1358 [<ffffffff810b0e5a>] local_apic_timer_interrupt+0x6a/0xb0 arch/x86/kernel/apic/apic.c:901 [<ffffffff8377c576>] smp_apic_timer_interrupt+0x76/0xa0 arch/x86/kernel/apic/apic.c:925 [<ffffffff8377b4d0>] apic_timer_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:741 <EOI> [<ffffffff81027e65>] arch_safe_halt arch/x86/include/asm/paravirt.h:117 [inline] [<ffffffff81027e65>] default_idle+0x55/0x3c0 arch/x86/kernel/process.c:290 [<ffffffff810293da>] arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:281 [<ffffffff81221948>] default_idle_call+0x48/0x70 kernel/sched/idle.c:93 [<ffffffff8122204d>] cpuidle_idle_call kernel/sched/idle.c:157 [inline] [<ffffffff8122204d>] cpu_idle_loop kernel/sched/idle.c:253 [inline] [<ffffffff8122204d>] cpu_startup_entry+0x5fd/0x8f0 kernel/sched/idle.c:301 [<ffffffff837667b9>] rest_init+0x189/0x190 init/main.c:410 [<ffffffff84823811>] start_kernel+0x6b9/0x6ee init/main.c:682 [<ffffffff84822312>] x86_64_start_reservations+0x2a/0x2c arch/x86/kernel/head64.c:196 [<ffffffff84822454>] x86_64_start_kernel+0x140/0x163 arch/x86/kernel/head64.c:185 Code: Bad RIP value. RIP [< (null)>] (null) RSP <ffff8801db207df0> CR2: 0000000000000000 ---[ end trace f7ec496779befe4c ]---