syzbot


KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits

Status: internal: reported C repro on 2024/10/30 13:59
Subsystems: net
[Documentation on labels]
Fix commit: iov-iter: do not return more bytes than requested in iov_iter_extract_bvec_pages()
Patched on: [], missing on: [ci-qemu-gce-upstream-auto ci-qemu-native-arm64-kvm ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm32 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-qemu2-riscv64 ci-snapshot-upstream-root 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-usb]
First crash: 10d, last: 5d22h
Last patch testing requests (1)
Created Duration User Patch Repo Result
2024/11/01 17:54 25m edumazet@google.com patch linux-next OK log

Sample crash report:
==================================================================
BUG: KASAN: slab-out-of-bounds in csum_partial_copy_nocheck include/net/checksum.h:53 [inline]
BUG: KASAN: slab-out-of-bounds in skb_copy_and_csum_bits+0x433/0x9c0 net/core/skbuff.c:3620
Write of size 1144 at addr ffff88807703c324 by task syz-executor615/5874

CPU: 1 UID: 0 PID: 5874 Comm: syz-executor615 Not tainted 6.12.0-rc5-next-20241031-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0x169/0x550 mm/kasan/report.c:488
 kasan_report+0x143/0x180 mm/kasan/report.c:601
 kasan_check_range+0x282/0x290 mm/kasan/generic.c:189
 __asan_memcpy+0x40/0x70 mm/kasan/shadow.c:106
 csum_partial_copy_nocheck include/net/checksum.h:53 [inline]
 skb_copy_and_csum_bits+0x433/0x9c0 net/core/skbuff.c:3620
 __ip_append_data+0x2fc1/0x40f0 net/ipv4/ip_output.c:1159
 ip_append_data+0x14c/0x190 net/ipv4/ip_output.c:1375
 udp_sendmsg+0x52c/0x2a50 net/ipv4/udp.c:1298
 sock_sendmsg_nosec net/socket.c:729 [inline]
 __sock_sendmsg+0x1a6/0x270 net/socket.c:744
 sock_sendmsg+0x134/0x200 net/socket.c:767
 splice_to_socket+0xa10/0x10b0 fs/splice.c:889
 do_splice_from fs/splice.c:941 [inline]
 do_splice+0xd68/0x18e0 fs/splice.c:1354
 __do_splice fs/splice.c:1436 [inline]
 __do_sys_splice fs/splice.c:1652 [inline]
 __se_sys_splice+0x331/0x4a0 fs/splice.c:1634
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1ac2a135e9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 91 1a 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f1ac29ac218 EFLAGS: 00000246 ORIG_RAX: 0000000000000113
RAX: ffffffffffffffda RBX: 00007f1ac2a9d418 RCX: 00007f1ac2a135e9
RDX: 0000000000000005 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007f1ac2a9d410 R08: 0000000000007151 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f1ac2a9d41c
R13: 00007f1ac2a6a44c R14: 00000000fffffecc R15: 00007ffc234fced8
 </TASK>

Allocated by task 5874:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 unpoison_slab_object mm/kasan/common.c:319 [inline]
 __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:345
 kasan_slab_alloc include/linux/kasan.h:250 [inline]
 slab_post_alloc_hook mm/slub.c:4104 [inline]
 slab_alloc_node mm/slub.c:4153 [inline]
 kmem_cache_alloc_node_noprof+0x1d9/0x380 mm/slub.c:4205
 kmalloc_reserve+0xa8/0x2a0 net/core/skbuff.c:587
 __alloc_skb+0x1f3/0x440 net/core/skbuff.c:678
 alloc_skb include/linux/skbuff.h:1322 [inline]
 __ip_append_data+0x2da7/0x40f0 net/ipv4/ip_output.c:1134
 ip_append_data+0x14c/0x190 net/ipv4/ip_output.c:1375
 udp_sendmsg+0x52c/0x2a50 net/ipv4/udp.c:1298
 sock_sendmsg_nosec net/socket.c:729 [inline]
 __sock_sendmsg+0x1a6/0x270 net/socket.c:744
 sock_sendmsg+0x134/0x200 net/socket.c:767
 splice_to_socket+0xa10/0x10b0 fs/splice.c:889
 do_splice_from fs/splice.c:941 [inline]
 do_splice+0xd68/0x18e0 fs/splice.c:1354
 __do_splice fs/splice.c:1436 [inline]
 __do_sys_splice fs/splice.c:1652 [inline]
 __se_sys_splice+0x331/0x4a0 fs/splice.c:1634
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88807703c300
 which belongs to the cache skbuff_small_head of size 640
The buggy address is located 36 bytes inside of
 allocated 640-byte region [ffff88807703c300, ffff88807703c580)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7703c
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801ea8ea00 dead000000000122 0000000000000000
raw: 0000000000000000 0000000080150015 00000001f5000000 0000000000000000
head: 00fff00000000040 ffff88801ea8ea00 dead000000000122 0000000000000000
head: 0000000000000000 0000000080150015 00000001f5000000 0000000000000000
head: 00fff00000000002 ffffea0001dc0f01 ffffffffffffffff 0000000000000000
head: 0000000000000004 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5874, tgid 5872 (syz-executor615), ts 142545840878, free_ts 134222079251
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1541
 prep_new_page mm/page_alloc.c:1549 [inline]
 get_page_from_freelist+0x3725/0x3870 mm/page_alloc.c:3495
 __alloc_pages_noprof+0x292/0x710 mm/page_alloc.c:4771
 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265
 alloc_slab_page+0x6a/0x140 mm/slub.c:2408
 allocate_slab+0x5a/0x2f0 mm/slub.c:2574
 new_slab mm/slub.c:2627 [inline]
 ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3815
 __slab_alloc+0x58/0xa0 mm/slub.c:3905
 __slab_alloc_node mm/slub.c:3980 [inline]
 slab_alloc_node mm/slub.c:4141 [inline]
 kmem_cache_alloc_node_noprof+0x269/0x380 mm/slub.c:4205
 kmalloc_reserve+0xa8/0x2a0 net/core/skbuff.c:587
 __alloc_skb+0x1f3/0x440 net/core/skbuff.c:678
 alloc_skb include/linux/skbuff.h:1322 [inline]
 __ip_append_data+0x2da7/0x40f0 net/ipv4/ip_output.c:1134
 ip_append_data+0x14c/0x190 net/ipv4/ip_output.c:1375
 udp_sendmsg+0x52c/0x2a50 net/ipv4/udp.c:1298
 sock_sendmsg_nosec net/socket.c:729 [inline]
 __sock_sendmsg+0x1a6/0x270 net/socket.c:744
 sock_sendmsg+0x134/0x200 net/socket.c:767
page last free pid 5859 tgid 5859 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1112 [inline]
 free_unref_page+0xcfb/0xf20 mm/page_alloc.c:2678
 __folio_put+0x2c7/0x440 mm/swap.c:126
 pipe_buf_release include/linux/pipe_fs_i.h:219 [inline]
 pipe_update_tail fs/pipe.c:224 [inline]
 pipe_read+0x6ed/0x13e0 fs/pipe.c:344
 new_sync_read fs/read_write.c:488 [inline]
 vfs_read+0x991/0xb70 fs/read_write.c:569
 ksys_read+0x183/0x2b0 fs/read_write.c:712
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88807703c480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88807703c500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88807703c580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff88807703c600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88807703c680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================

Crashes (76):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/10/31 15:00 linux-next f9f24ca362a4 fb888278 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits
2024/11/04 00:56 linux-next c88416ba074a f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits
2024/11/03 22:02 linux-next c88416ba074a f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits
2024/11/03 20:11 linux-next c88416ba074a f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits
2024/11/03 11:29 linux-next c88416ba074a f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits
2024/11/03 10:54 linux-next c88416ba074a f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits
2024/11/03 09:02 linux-next c88416ba074a f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits
2024/11/03 00:49 linux-next c88416ba074a f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits
2024/11/01 19:07 linux-next c88416ba074a f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits
2024/11/01 19:07 linux-next c88416ba074a f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits
2024/11/01 18:55 linux-next c88416ba074a f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits
2024/11/01 18:55 linux-next c88416ba074a f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits
2024/11/01 18:55 linux-next c88416ba074a f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits
2024/11/01 13:43 linux-next c88416ba074a 96eb609f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits
2024/11/01 13:43 linux-next c88416ba074a 96eb609f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits
2024/11/01 10:20 linux-next c88416ba074a 96eb609f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits
2024/11/01 05:48 linux-next f9f24ca362a4 96eb609f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits
2024/11/01 05:47 linux-next f9f24ca362a4 96eb609f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits
2024/10/31 22:19 linux-next f9f24ca362a4 96eb609f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits
2024/10/30 20:54 linux-next 86e3904dcdc7 66aeb999 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits
2024/10/30 20:54 linux-next 86e3904dcdc7 66aeb999 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits
2024/10/30 20:31 linux-next 86e3904dcdc7 66aeb999 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits
2024/10/30 20:30 linux-next 86e3904dcdc7 66aeb999 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits
2024/10/30 20:19 linux-next 86e3904dcdc7 66aeb999 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits
2024/10/30 20:19 linux-next 86e3904dcdc7 66aeb999 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits
2024/10/30 20:12 linux-next 86e3904dcdc7 66aeb999 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits
2024/10/30 20:12 linux-next 86e3904dcdc7 66aeb999 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits
2024/10/30 19:10 linux-next 86e3904dcdc7 66aeb999 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits
2024/10/30 19:10 linux-next 86e3904dcdc7 66aeb999 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits
2024/10/30 17:26 linux-next 86e3904dcdc7 66aeb999 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits
2024/10/30 17:26 linux-next 86e3904dcdc7 66aeb999 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits
2024/10/30 17:25 linux-next 86e3904dcdc7 66aeb999 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits
2024/10/30 17:22 linux-next 86e3904dcdc7 66aeb999 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits
2024/10/30 16:58 linux-next 86e3904dcdc7 66aeb999 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits
2024/10/30 16:51 linux-next 86e3904dcdc7 66aeb999 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits
2024/10/30 16:49 linux-next 86e3904dcdc7 66aeb999 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits
2024/10/30 16:37 linux-next 86e3904dcdc7 66aeb999 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits
2024/10/30 15:36 linux-next 86e3904dcdc7 66aeb999 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits
2024/10/30 15:35 linux-next 86e3904dcdc7 66aeb999 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits
2024/10/30 15:03 linux-next 86e3904dcdc7 66aeb999 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits
2024/10/30 15:02 linux-next 86e3904dcdc7 66aeb999 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits
2024/10/30 14:57 linux-next 86e3904dcdc7 66aeb999 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits
2024/10/30 14:27 linux-next 86e3904dcdc7 66aeb999 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits
2024/10/30 14:27 linux-next 86e3904dcdc7 66aeb999 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits
2024/10/30 14:06 linux-next 86e3904dcdc7 66aeb999 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits
2024/10/30 14:06 linux-next 86e3904dcdc7 66aeb999 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits
2024/10/30 13:59 linux-next 86e3904dcdc7 66aeb999 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits
2024/10/30 13:58 linux-next 86e3904dcdc7 66aeb999 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Write in skb_copy_and_csum_bits
* Struck through repros no longer work on HEAD.