syzbot


KASAN: slab-out-of-bounds Read in do_ipt_set_ctl

Status: internal: reported C repro on 2024/04/04 11:20
Subsystems: netfilter
[Documentation on labels]
Fix commit: 0c83842df40f netfilter: validate user input for expected length
Patched on: [ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm32 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-arm64 ci-upstream-gce-leak ci-upstream-kasan-badwrites-root ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-kmsan-gce-386-root ci-upstream-kmsan-gce-root ci-upstream-linux-next-kasan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci2-upstream-fs ci2-upstream-kcsan-gce ci2-upstream-net-next-test-gce ci2-upstream-usb], missing on: [ci-qemu2-riscv64]
First crash: 48d, last: 37d

Sample crash report:
==================================================================
BUG: KASAN: slab-out-of-bounds in copy_from_sockptr_offset include/linux/sockptr.h:49 [inline]
BUG: KASAN: slab-out-of-bounds in copy_from_sockptr include/linux/sockptr.h:55 [inline]
BUG: KASAN: slab-out-of-bounds in do_replace net/ipv4/netfilter/ip_tables.c:1111 [inline]
BUG: KASAN: slab-out-of-bounds in do_ipt_set_ctl+0x2b4/0x2f90 net/ipv4/netfilter/ip_tables.c:1627
Read of size 96 at addr ffff0000c6c07780 by task syz-executor658/6166

CPU: 0 PID: 6166 Comm: syz-executor658 Not tainted 6.8.0-rc7-syzkaller-g707081b61156 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call trace:
 dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:291
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:298
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0x178/0x518 mm/kasan/report.c:488
 kasan_report+0xd8/0x138 mm/kasan/report.c:601
 kasan_check_range+0x254/0x294 mm/kasan/generic.c:189
 __asan_memcpy+0x3c/0x84 mm/kasan/shadow.c:105
 copy_from_sockptr_offset include/linux/sockptr.h:49 [inline]
 copy_from_sockptr include/linux/sockptr.h:55 [inline]
 do_replace net/ipv4/netfilter/ip_tables.c:1111 [inline]
 do_ipt_set_ctl+0x2b4/0x2f90 net/ipv4/netfilter/ip_tables.c:1627
 nf_setsockopt+0x270/0x290 net/netfilter/nf_sockopt.c:101
 ip_setsockopt+0x118/0x128 net/ipv4/ip_sockglue.c:1420
 tcp_setsockopt+0xcc/0xe8 net/ipv4/tcp.c:3734
 sock_common_setsockopt+0xb0/0xcc net/core/sock.c:3715
 do_sock_setsockopt+0x2a0/0x4e0 net/socket.c:2311
 __sys_setsockopt+0x128/0x1a8 net/socket.c:2334
 __do_sys_setsockopt net/socket.c:2343 [inline]
 __se_sys_setsockopt net/socket.c:2340 [inline]
 __arm64_sys_setsockopt+0xb8/0xd4 net/socket.c:2340
 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152
 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598

Allocated by task 6166:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x40/0x78 mm/kasan/common.c:68
 kasan_save_alloc_info+0x40/0x50 mm/kasan/generic.c:575
 poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
 __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:387
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slub.c:3981 [inline]
 __kmalloc+0x2bc/0x5d4 mm/slub.c:3994
 kmalloc include/linux/slab.h:594 [inline]
 __cgroup_bpf_run_filter_setsockopt+0xa94/0xd1c kernel/bpf/cgroup.c:1872
 do_sock_setsockopt+0x498/0x4e0 net/socket.c:2293
 __sys_setsockopt+0x128/0x1a8 net/socket.c:2334
 __do_sys_setsockopt net/socket.c:2343 [inline]
 __se_sys_setsockopt net/socket.c:2340 [inline]
 __arm64_sys_setsockopt+0xb8/0xd4 net/socket.c:2340
 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152
 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598

The buggy address belongs to the object at ffff0000c6c07780
 which belongs to the cache kmalloc-8 of size 8
The buggy address is located 0 bytes inside of
 allocated 1-byte region [ffff0000c6c07780, ffff0000c6c07781)

The buggy address belongs to the physical page:
page:00000000e8c304dd refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x106c07
flags: 0x5ffc00000000800(slab|node=0|zone=2|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 05ffc00000000800 ffff0000c0001280 fffffdffc321a580 dead000000000002
raw: 0000000000000000 0000000080800080 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000c6c07680: 06 fc fc fc fa fc fc fc fa fc fc fc 06 fc fc fc
 ffff0000c6c07700: 06 fc fc fc 06 fc fc fc 06 fc fc fc 00 fc fc fc
>ffff0000c6c07780: 01 fc fc fc 06 fc fc fc 06 fc fc fc 06 fc fc fc
                   ^
 ffff0000c6c07800: 06 fc fc fc fa fc fc fc fa fc fc fc 06 fc fc fc
 ffff0000c6c07880: 06 fc fc fc 06 fc fc fc 06 fc fc fc fa fc fc fc
==================================================================

Crashes (111):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/04/04 14:14 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 707081b61156 0ee3535e .config console log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 KASAN: slab-out-of-bounds Read in do_ipt_set_ctl
2024/04/15 10:25 upstream fe46a7dd189e c8349e48 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Read in do_ipt_set_ctl
2024/04/14 22:49 upstream fe46a7dd189e c8349e48 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Read in do_ipt_set_ctl
2024/04/14 18:00 upstream fe46a7dd189e c8349e48 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: slab-out-of-bounds Read in do_ipt_set_ctl
2024/04/14 11:10 upstream fe46a7dd189e c8349e48 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: slab-out-of-bounds Read in do_ipt_set_ctl
2024/04/14 08:11 upstream fe46a7dd189e c8349e48 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Read in do_ipt_set_ctl
2024/04/14 06:25 upstream fe46a7dd189e c8349e48 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: slab-out-of-bounds Read in do_ipt_set_ctl
2024/04/13 23:12 upstream fe46a7dd189e c8349e48 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Read in do_ipt_set_ctl
2024/04/13 15:26 upstream fe46a7dd189e c8349e48 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: slab-out-of-bounds Read in do_ipt_set_ctl
2024/04/13 10:20 upstream fe46a7dd189e c8349e48 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: slab-out-of-bounds Read in do_ipt_set_ctl
2024/04/13 07:21 upstream fe46a7dd189e c8349e48 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Read in do_ipt_set_ctl
2024/04/12 21:01 upstream fe46a7dd189e 27de0a5c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: slab-out-of-bounds Read in do_ipt_set_ctl
2024/04/12 12:54 upstream fe46a7dd189e 27de0a5c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Read in do_ipt_set_ctl
2024/04/12 01:31 upstream fe46a7dd189e 478efa7f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Read in do_ipt_set_ctl
2024/04/11 20:58 upstream fe46a7dd189e 478efa7f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: slab-out-of-bounds Read in do_ipt_set_ctl
2024/04/11 06:09 upstream fe46a7dd189e 56086b24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Read in do_ipt_set_ctl
2024/04/11 03:29 upstream fe46a7dd189e 56086b24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: slab-out-of-bounds Read in do_ipt_set_ctl
2024/04/10 14:51 upstream fe46a7dd189e 56086b24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Read in do_ipt_set_ctl
2024/04/10 12:47 upstream fe46a7dd189e 56086b24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: slab-out-of-bounds Read in do_ipt_set_ctl
2024/04/10 10:37 upstream fe46a7dd189e 56086b24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: slab-out-of-bounds Read in do_ipt_set_ctl
2024/04/09 23:26 upstream fe46a7dd189e 56086b24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Read in do_ipt_set_ctl
2024/04/09 03:58 upstream fe46a7dd189e 53df08b6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Read in do_ipt_set_ctl
2024/04/08 23:01 upstream fe46a7dd189e 53df08b6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Read in do_ipt_set_ctl
2024/04/08 13:39 upstream fe46a7dd189e ca620dd8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: slab-out-of-bounds Read in do_ipt_set_ctl
2024/04/08 12:22 upstream fe46a7dd189e ca620dd8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Read in do_ipt_set_ctl
2024/04/08 10:48 upstream fe46a7dd189e ca620dd8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Read in do_ipt_set_ctl
2024/04/08 05:22 upstream fe46a7dd189e ca620dd8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: slab-out-of-bounds Read in do_ipt_set_ctl
2024/04/08 03:02 upstream fe46a7dd189e ca620dd8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Read in do_ipt_set_ctl
2024/04/08 00:48 upstream fe46a7dd189e ca620dd8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: slab-out-of-bounds Read in do_ipt_set_ctl
2024/04/07 23:38 upstream fe46a7dd189e ca620dd8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Read in do_ipt_set_ctl
2024/04/07 18:17 upstream fe46a7dd189e ca620dd8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: slab-out-of-bounds Read in do_ipt_set_ctl
2024/04/07 14:04 upstream fe46a7dd189e ca620dd8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Read in do_ipt_set_ctl
2024/04/07 06:24 upstream f2f80ac80987 ca620dd8 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm64-mte KASAN: slab-out-of-bounds Read in do_ipt_set_ctl
2024/04/10 16:10 linux-next a053fd3ca5d1 56086b24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Read in do_ipt_set_ctl
2024/04/07 19:19 linux-next 8568bb2ccc27 ca620dd8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Read in do_ipt_set_ctl
2024/04/09 21:06 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 707081b61156 56086b24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 KASAN: slab-out-of-bounds Read in do_ipt_set_ctl
2024/04/09 19:58 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 707081b61156 56086b24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 KASAN: slab-out-of-bounds Read in do_ipt_set_ctl
2024/04/09 05:25 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 707081b61156 53df08b6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 KASAN: slab-out-of-bounds Read in do_ipt_set_ctl
2024/04/08 21:37 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 707081b61156 53df08b6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 KASAN: slab-out-of-bounds Read in do_ipt_set_ctl
2024/04/08 17:21 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 707081b61156 53df08b6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 KASAN: slab-out-of-bounds Read in do_ipt_set_ctl
2024/04/08 09:32 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 707081b61156 ca620dd8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 KASAN: slab-out-of-bounds Read in do_ipt_set_ctl
2024/04/08 07:21 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 707081b61156 ca620dd8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 KASAN: slab-out-of-bounds Read in do_ipt_set_ctl
2024/04/08 04:13 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 707081b61156 ca620dd8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 KASAN: slab-out-of-bounds Read in do_ipt_set_ctl
2024/04/07 15:13 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 707081b61156 ca620dd8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 KASAN: slab-out-of-bounds Read in do_ipt_set_ctl
2024/04/07 11:51 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 707081b61156 ca620dd8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 KASAN: slab-out-of-bounds Read in do_ipt_set_ctl
2024/04/07 11:51 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 707081b61156 ca620dd8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 KASAN: slab-out-of-bounds Read in do_ipt_set_ctl
2024/04/07 06:53 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 707081b61156 ca620dd8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 KASAN: slab-out-of-bounds Read in do_ipt_set_ctl
* Struck through repros no longer work on HEAD.