Hello! On Tue 24-10-23 10:30:46, Yikebaer Aizezi wrote: > When using Healer to fuzz the Linux 6.6-rc7 Linux kernel, the following crash > was triggered. Thanks for report but I don't think there's a big interest in fixing reiserfs errors found by a fuzzer. Reiserfs is scheduled for removal from the kernel so it would be mostly a wasted effort. Honza > > HEAD commit: 05d3ef8bba77c1b5f98d941d8b2d4aeab8118ef1 ( Linux 6.6-rc7) > git tree: upstream > > console output: > https://drive.google.com/file/d/1qQhQwRydIp1SIiDJghcfp384uZ3gF8-T/view?usp=drive_link > kernel config:https://drive.google.com/file/d/1gOeRhOnJr2htj6PPnEDTFUkli94JwVvJ/view?usp=drive_link > C reproducer:https://drive.google.com/file/d/19te0q4_oUfcCoMarjNmkWXvnuwyvhRL-/view?usp=drive_link > Syzlang reproducer: > https://drive.google.com/file/d/12vmCNO8HysQ9-C5TC90mpjmZXOJ90k8C/view?usp=drive_link > > If you fix this issue, please add the following tag to the commit: > Reported-by: Yikebaer Aizezi <yikebaer61@xxxxxxxxx> > > ================================================================== > BUG: KASAN: use-after-free in search_by_entry_key+0x81f/0x960 > fs/reiserfs/namei.c:165 > Read of size 4 at addr ffff8880316dcfc4 by task syz-executor.0/41572 > > CPU: 0 PID: 41572 Comm: syz-executor.0 Not tainted 6.6.0-rc7-g05d3ef8bba77 #8 > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS > rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 > Call Trace: > <TASK> > __dump_stack lib/dump_stack.c:88 [inline] > dump_stack_lvl+0xd5/0x150 lib/dump_stack.c:106 > print_address_description mm/kasan/report.c:364 [inline] > print_report+0xc1/0x5e0 mm/kasan/report.c:475 > kasan_report+0xba/0xf0 mm/kasan/report.c:588 > bin_search_in_dir_item fs/reiserfs/namei.c:40 [inline] > search_by_entry_key+0x81f/0x960 fs/reiserfs/namei.c:165 > reiserfs_find_entry.part.0+0x139/0xdf0 fs/reiserfs/namei.c:322 > reiserfs_find_entry fs/reiserfs/namei.c:392 [inline] > reiserfs_lookup+0x24d/0x610 fs/reiserfs/namei.c:368 > __lookup_slow+0x24c/0x460 fs/namei.c:1694 > lookup_one_len+0x16a/0x1a0 fs/namei.c:2746 > reiserfs_lookup_privroot+0x92/0x210 fs/reiserfs/xattr.c:977 > reiserfs_fill_super+0x20fa/0x2ea0 fs/reiserfs/super.c:2174 > mount_bdev+0x1fd/0x2f0 fs/super.c:1629 > legacy_get_tree+0x105/0x220 fs/fs_context.c:662 > vfs_get_tree+0x8d/0x370 fs/super.c:1750 > do_new_mount fs/namespace.c:3335 [inline] > path_mount+0x671/0x1e40 fs/namespace.c:3662 > do_mount fs/namespace.c:3675 [inline] > __do_sys_mount fs/namespace.c:3884 [inline] > __se_sys_mount fs/namespace.c:3861 [inline] > __x64_sys_mount+0x27f/0x300 fs/namespace.c:3861 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x63/0xcd > RIP: 0033:0x7ff4f9690abe > Code: 48 c7 c0 ff ff ff ff eb aa e8 be 0d 00 00 66 2e 0f 1f 84 00 00 > 00 00 00 0f 1f 40 00 f3 0f 1e fa 49 89 ca b8 a5 00 00 00 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:00007ff4fa3bde38 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 > RAX: ffffffffffffffda RBX: 000000000000ffe6 RCX: 00007ff4f9690abe > RDX: 0000000020010000 RSI: 0000000020010040 RDI: 00007ff4fa3bde90 > RBP: 00007ff4fa3bded0 R08: 00007ff4fa3bded0 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020010000 > R13: 0000000020010040 R14: 00007ff4fa3bde90 R15: 00000000200005c0 > </TASK> > > The buggy address belongs to the physical page: > page:ffffea0000c5b700 refcount:0 mapcount:0 mapping:0000000000000000 > index:0x1 pfn:0x316dc > flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) > page_type: 0xffffffff() > raw: 00fff00000000000 dead000000000100 dead000000000122 0000000000000000 > raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000 > page dumped because: kasan: bad access detected > page_owner tracks the page as freed > page last allocated via order 0, migratetype Movable, gfp_mask > 0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), pid 41568, tgid 41567 > (syz-executor.2), ts 1584644584471, free_ts 1585399046358 > prep_new_page mm/page_alloc.c:1543 [inline] > get_page_from_freelist+0xf09/0x2c50 mm/page_alloc.c:3170 > __alloc_pages+0x1c7/0x490 mm/page_alloc.c:4426 > __folio_alloc+0x12/0x40 mm/page_alloc.c:4458 > vma_alloc_folio+0x153/0x870 mm/mempolicy.c:2258 > shmem_alloc_folio+0x121/0x1f0 mm/shmem.c:1658 > shmem_alloc_and_acct_folio+0xd2/0x150 mm/shmem.c:1683 > shmem_get_folio_gfp+0x96b/0x18e0 mm/shmem.c:2020 > shmem_get_folio mm/shmem.c:2143 [inline] > shmem_write_begin+0x146/0x440 mm/shmem.c:2688 > generic_perform_write+0x267/0x5d0 mm/filemap.c:3969 > shmem_file_write_iter+0x10f/0x140 mm/shmem.c:2865 > call_write_iter include/linux/fs.h:1956 [inline] > new_sync_write fs/read_write.c:491 [inline] > vfs_write+0x989/0xdb0 fs/read_write.c:584 > ksys_write+0x11e/0x240 fs/read_write.c:637 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x63/0xcd > page last free stack trace: > reset_page_owner include/linux/page_owner.h:24 [inline] > free_pages_prepare mm/page_alloc.c:1136 [inline] > free_unref_page_prepare+0x450/0xa30 mm/page_alloc.c:2312 > free_unref_page_list+0xec/0xac0 mm/page_alloc.c:2451 > release_pages+0xca9/0x1350 mm/swap.c:1042 > __folio_batch_release+0x73/0xd0 mm/swap.c:1062 > folio_batch_release include/linux/pagevec.h:83 [inline] > shmem_undo_range+0x545/0x10f0 mm/shmem.c:1022 > shmem_truncate_range mm/shmem.c:1114 [inline] > shmem_evict_inode+0x38a/0xb70 mm/shmem.c:1243 > evict+0x2ed/0x6b0 fs/inode.c:664 > iput_final fs/inode.c:1775 [inline] > iput.part.0+0x50f/0x710 fs/inode.c:1801 > iput+0x58/0x70 fs/inode.c:1791 > dentry_unlink_inode+0x28c/0x430 fs/dcache.c:401 > __dentry_kill+0x3bd/0x640 fs/dcache.c:607 > dentry_kill fs/dcache.c:733 [inline] > dput+0x847/0xde0 fs/dcache.c:913 > __fput+0x543/0xa70 fs/file_table.c:392 > task_work_run+0x164/0x250 kernel/task_work.c:180 > resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] > exit_to_user_mode_loop kernel/entry/common.c:171 [inline] > exit_to_user_mode_prepare+0x215/0x240 kernel/entry/common.c:204 > __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] > syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:296 > > Memory state around the buggy address: > ffff8880316dce80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff > ffff8880316dcf00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff > >ffff8880316dcf80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff > ^ > ffff8880316dd000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff > ffff8880316dd080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff > ================================================================== > -- Jan Kara <jack@xxxxxxxx> SUSE Labs, CR
