Kernel commit: v6.14-rc4 (Commits on Feb 24, 2025) Kernel Config : https://github.com/Strforexc/LinuxKernelbug/blob/main/.config Kernel Log: https://github.com/Strforexc/LinuxKernelbug/blob/main/KASAN_slab-out-of-bounds_Write_in_hfs_bnode_read/log0 Reproduce: https://github.com/Strforexc/LinuxKernelbug/blob/main/KASAN_slab-out-of-bounds_Write_in_hfs_bnode_read/repro.cprog This bug seems to have been reported and fixed in the old kernel, which seems to be a regression issue? If you fix this issue, please add the following tag to the commit: Reported-by: Zhizhuo Tang strforexctzzchange@xxxxxxxxxxx, Jianzhou Zhao xnxc22xnxc22@xxxxxx, Haoran Liu <cherest_san@xxxxxxx> ================================================================== BUG: KASAN: slab-out-of-bounds in memcpy_from_page include/linux/highmem.h:423 [inline] BUG: KASAN: slab-out-of-bounds in hfs_bnode_read+0xc5/0x230 fs/hfs/bnode.c:35 Write of size 256 at addr ffff8880512bab80 by task syz.3.4/11486 CPU: 1 UID: 0 PID: 11486 Comm: syz.3.4 Not tainted 6.14.0-rc4 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1b0 lib/dump_stack.c:120 print_address_description.constprop.0+0x2c/0x420 mm/kasan/report.c:408 print_report+0xaa/0x270 mm/kasan/report.c:521 kasan_report+0xbd/0x100 mm/kasan/report.c:634 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0x108/0x1e0 mm/kasan/generic.c:189 __asan_memcpy+0x3d/0x70 mm/kasan/shadow.c:106 memcpy_from_page include/linux/highmem.h:423 [inline] hfs_bnode_read+0xc5/0x230 fs/hfs/bnode.c:35 hfs_bnode_read_key+0x149/0x1f0 fs/hfs/bnode.c:70 hfs_brec_insert+0x822/0xbd0 fs/hfs/brec.c:141 hfs_cat_create+0x6a5/0x840 fs/hfs/catalog.c:131 hfs_create+0x6b/0x100 fs/hfs/dir.c:202 lookup_open.isra.0+0x1145/0x1540 fs/namei.c:3651 open_last_lookups+0x82c/0x13b0 fs/namei.c:3750 path_openat+0x182/0x6b0 fs/namei.c:3986 do_filp_open+0x1f8/0x460 fs/namei.c:4016 do_sys_openat2+0x16a/0x1d0 fs/open.c:1428 do_sys_open fs/open.c:1443 [inline] __do_sys_openat fs/open.c:1459 [inline] __se_sys_openat fs/open.c:1454 [inline] __x64_sys_openat+0x140/0x200 fs/open.c:1454 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcb/0x260 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f651abb85ad Code: 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f651b9acf98 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f651ae45fa0 RCX: 00007f651abb85ad RDX: 0000000000141842 RSI: 0000400000000380 RDI: ffffffffffffff9c RBP: 00007f651ac6a8d6 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f651ae45fa0 R15: 00007f651b98d000 </TASK> Allocated by task 11486: kasan_save_stack+0x24/0x50 mm/kasan/common.c:47 kasan_save_track+0x14/0x40 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0xba/0xc0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4294 [inline] __kmalloc_noprof+0x212/0x580 mm/slub.c:4306 kmalloc_noprof include/linux/slab.h:905 [inline] hfs_find_init+0x95/0x260 fs/hfs/bfind.c:21 hfs_cat_create+0x155/0x840 fs/hfs/catalog.c:96 hfs_create+0x6b/0x100 fs/hfs/dir.c:202 lookup_open.isra.0+0x1145/0x1540 fs/namei.c:3651 open_last_lookups+0x82c/0x13b0 fs/namei.c:3750 path_openat+0x182/0x6b0 fs/namei.c:3986 do_filp_open+0x1f8/0x460 fs/namei.c:4016 do_sys_openat2+0x16a/0x1d0 fs/open.c:1428 do_sys_open fs/open.c:1443 [inline] __do_sys_openat fs/open.c:1459 [inline] __se_sys_openat fs/open.c:1454 [inline] __x64_sys_openat+0x140/0x200 fs/open.c:1454 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcb/0x260 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff8880512bab80 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 0 bytes inside of allocated 78-byte region [ffff8880512bab80, ffff8880512babce) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x512ba ksm flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 04fff00000000000 ffff88801b441280 ffffea000136d8c0 dead000000000003 raw: 0000000000000000 0000000080200020 00000000f5000000 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 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 9758, tgid 9758 (kworker/u8:3), ts 68385688828, free_ts 68344511646 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1a3/0x1d0 mm/page_alloc.c:1551 prep_new_page mm/page_alloc.c:1559 [inline] get_page_from_freelist+0x8a5/0xfa0 mm/page_alloc.c:3477 __alloc_frozen_pages_noprof+0x1d8/0x3b0 mm/page_alloc.c:4739 alloc_pages_mpol+0x1f2/0x550 mm/mempolicy.c:2270 alloc_slab_page mm/slub.c:2423 [inline] allocate_slab+0x229/0x310 mm/slub.c:2587 ___slab_alloc+0x7f3/0x12b0 mm/slub.c:3826 __slab_alloc.constprop.0+0x56/0xc0 mm/slub.c:3916 __slab_alloc_node mm/slub.c:3991 [inline] slab_alloc_node mm/slub.c:4152 [inline] __kmalloc_cache_noprof+0x280/0x450 mm/slub.c:4320 kmalloc_noprof include/linux/slab.h:901 [inline] kzalloc_noprof include/linux/slab.h:1037 [inline] nsim_fib_event_schedule_work+0xb3/0x8d0 drivers/net/netdevsim/fib.c:990 nsim_fib_event_nb+0x14e/0x190 drivers/net/netdevsim/fib.c:1043 notifier_call_chain+0xd7/0x250 kernel/notifier.c:85 atomic_notifier_call_chain+0x71/0x1d0 kernel/notifier.c:223 call_fib_notifiers+0x34/0x70 net/core/fib_notifier.c:35 call_fib6_entry_notifiers net/ipv6/ip6_fib.c:397 [inline] fib6_add_rt2node+0x19fa/0x3160 net/ipv6/ip6_fib.c:1231 fib6_add+0x4b2/0x1720 net/ipv6/ip6_fib.c:1488 __ip6_ins_rt net/ipv6/route.c:1317 [inline] ip6_ins_rt+0xb6/0x120 net/ipv6/route.c:1327 page last free pid 9550 tgid 9550 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_frozen_pages+0x71f/0xff0 mm/page_alloc.c:2660 __put_partials+0x13b/0x190 mm/slub.c:3153 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x50/0x130 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x1a5/0x1f0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x6f/0xa0 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4115 [inline] slab_alloc_node mm/slub.c:4164 [inline] __do_kmalloc_node mm/slub.c:4293 [inline] __kmalloc_noprof+0x1c3/0x580 mm/slub.c:4306 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1037 [inline] fib6_info_alloc+0x40/0x170 net/ipv6/ip6_fib.c:155 ip6_route_info_create+0x341/0x1930 net/ipv6/route.c:3766 ip6_route_add+0x28/0x180 net/ipv6/route.c:3858 addrconf_add_mroute+0x1de/0x360 net/ipv6/addrconf.c:2549 addrconf_add_dev+0x154/0x1d0 net/ipv6/addrconf.c:2567 inet6_addr_add+0x100/0x980 net/ipv6/addrconf.c:3029 inet6_rtm_newaddr+0x93c/0xaa0 net/ipv6/addrconf.c:5054 rtnetlink_rcv_msg+0x9f4/0xfc0 net/core/rtnetlink.c:6912 netlink_rcv_skb+0x168/0x450 net/netlink/af_netlink.c:2543 netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline] netlink_unicast+0x552/0x800 net/netlink/af_netlink.c:1348 Memory state around the buggy address: ffff8880512baa80: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc ffff8880512bab00: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc >ffff8880512bab80: 00 00 00 00 00 00 00 00 00 06 fc fc fc fc fc fc ^ ffff8880512bac00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff8880512bac80: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ================================================================== Thanks, Zhizhuo Tang
