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List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1529:b0:3d4:3fbf:967d with SMTP id e9e14a558f8ab-3d6dd781c22mr34839455ab.7.1743691337902; Thu, 03 Apr 2025 07:42:17 -0700 (PDT) Date: Thu, 03 Apr 2025 07:42:17 -0700 In-Reply-To: <67e234e0.050a0220.a7ebc.0037.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <67ee9e49.050a0220.9040b.01d3.GAE@google.com> Subject: Re: [syzbot] [bcachefs?] KASAN: slab-out-of-bounds Read in memscan (2) From: syzbot To: kent.overstreet@linux.dev, linux-bcachefs@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: a1b5bd45d4ee Merge tag 'usb-6.15-rc1' of git://git.kernel... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1524d404580000 kernel config: https://syzkaller.appspot.com/x/.config?x=6fe3b5e6a2cb1cc2 dashboard link: https://syzkaller.appspot.com/bug?extid=ca8a872d9fa7652522da compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1745f7b0580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-a1b5bd45.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/8b14e02f603d/vmlinux-a1b5bd45.xz kernel image: https://storage.googleapis.com/syzbot-assets/cc06cac05b38/bzImage-a1b5bd45.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/f3f07afca2d8/mount_1.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+ca8a872d9fa7652522da@syzkaller.appspotmail.com R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 0000000000000000 R14: 00007f14a1da5fa0 R15: 00007ffd3c658fa8 ================================================================== BUG: KASAN: slab-out-of-bounds in memscan+0x61/0x80 lib/string.c:728 Read of size 1 at addr ffff8880370da18b by task syz.0.16/5514 CPU: 0 UID: 0 PID: 5514 Comm: syz.0.16 Not tainted 6.14.0-syzkaller-12886-ga1b5bd45d4ee #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __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:408 [inline] print_report+0x16e/0x5b0 mm/kasan/report.c:521 kasan_report+0x143/0x180 mm/kasan/report.c:634 memscan+0x61/0x80 lib/string.c:728 _Z7memscanPvU25pass_dynamic_object_size0im include/linux/fortify-string.h:708 [inline] __printbuf_do_indent fs/bcachefs/printbuf.c:101 [inline] printbuf_do_indent+0x110/0xa10 fs/bcachefs/printbuf.c:155 bch2_prt_printf+0x55b/0x6d0 fs/bcachefs/printbuf.c:190 trace_bucket_alloc2+0x214/0xb90 fs/bcachefs/alloc_foreground.c:472 bch2_bucket_alloc_trans+0x2eaf/0x2ed0 fs/bcachefs/alloc_foreground.c:587 bch2_bucket_alloc_set_trans+0x532/0xd00 fs/bcachefs/alloc_foreground.c:713 __open_bucket_add_buckets+0x13fc/0x1e80 fs/bcachefs/alloc_foreground.c:956 open_bucket_add_buckets+0x343/0x410 fs/bcachefs/alloc_foreground.c:1000 bch2_alloc_sectors_start_trans+0xcf4/0x2050 fs/bcachefs/alloc_foreground.c:-1 __bch2_write+0x677/0x46c0 fs/bcachefs/io_write.c:1482 bch2_write+0x834/0x15d0 fs/bcachefs/io_write.c:1669 closure_queue include/linux/closure.h:270 [inline] closure_call include/linux/closure.h:432 [inline] bch2_dio_write_loop fs/bcachefs/fs-io-direct.c:545 [inline] bch2_direct_write+0x1b0d/0x31a0 fs/bcachefs/fs-io-direct.c:668 bch2_write_iter+0x195/0x2cd0 fs/bcachefs/fs-io-buffered.c:1057 new_sync_write fs/read_write.c:591 [inline] vfs_write+0x70f/0xd10 fs/read_write.c:684 ksys_write+0x19d/0x2d0 fs/read_write.c:736 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f14a1b8d169 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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:00007f14a2a23038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f14a1da5fa0 RCX: 00007f14a1b8d169 RDX: 000000000000f000 RSI: 0000200000000200 RDI: 0000000000000006 RBP: 00007f14a2a23090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 0000000000000000 R14: 00007f14a1da5fa0 R15: 00007ffd3c658fa8 Allocated by task 5514: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0x9d/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4331 [inline] __kmalloc_node_track_caller_noprof+0x295/0x4d0 mm/slub.c:4350 __do_krealloc mm/slub.c:4908 [inline] krealloc_noprof+0x10f/0x300 mm/slub.c:4961 bch2_printbuf_make_room+0x1f1/0x350 fs/bcachefs/printbuf.c:59 bch2_prt_printf+0x269/0x6d0 fs/bcachefs/printbuf.c:186 trace_bucket_alloc2+0x1c6/0xb90 fs/bcachefs/alloc_foreground.c:470 bch2_bucket_alloc_trans+0x2eaf/0x2ed0 fs/bcachefs/alloc_foreground.c:587 bch2_bucket_alloc_set_trans+0x532/0xd00 fs/bcachefs/alloc_foreground.c:713 __open_bucket_add_buckets+0x13fc/0x1e80 fs/bcachefs/alloc_foreground.c:956 open_bucket_add_buckets+0x343/0x410 fs/bcachefs/alloc_foreground.c:1000 bch2_alloc_sectors_start_trans+0xcf4/0x2050 fs/bcachefs/alloc_foreground.c:-1 __bch2_write+0x677/0x46c0 fs/bcachefs/io_write.c:1482 bch2_write+0x834/0x15d0 fs/bcachefs/io_write.c:1669 closure_queue include/linux/closure.h:270 [inline] closure_call include/linux/closure.h:432 [inline] bch2_dio_write_loop fs/bcachefs/fs-io-direct.c:545 [inline] bch2_direct_write+0x1b0d/0x31a0 fs/bcachefs/fs-io-direct.c:668 bch2_write_iter+0x195/0x2cd0 fs/bcachefs/fs-io-buffered.c:1057 new_sync_write fs/read_write.c:591 [inline] vfs_write+0x70f/0xd10 fs/read_write.c:684 ksys_write+0x19d/0x2d0 fs/read_write.c:736 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff8880370da100 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 11 bytes to the right of allocated 128-byte region [ffff8880370da100, ffff8880370da180) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x370da flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 04fff00000000000 ffff88801b041a00 dead000000000122 0000000000000000 raw: 0000000000000000 0000000080100010 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 0x52c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5514, tgid 5513 (syz.0.16), ts 101748145234, free_ts 101731411139 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1717 prep_new_page mm/page_alloc.c:1725 [inline] get_page_from_freelist+0x352b/0x36c0 mm/page_alloc.c:3652 __alloc_frozen_pages_noprof+0x211/0x5b0 mm/page_alloc.c:4934 alloc_pages_mpol+0x339/0x690 mm/mempolicy.c:2301 alloc_slab_page mm/slub.c:2459 [inline] allocate_slab+0x8f/0x3a0 mm/slub.c:2623 new_slab mm/slub.c:2676 [inline] ___slab_alloc+0xc3b/0x1500 mm/slub.c:3862 __slab_alloc+0x58/0xa0 mm/slub.c:3952 __slab_alloc_node mm/slub.c:4027 [inline] slab_alloc_node mm/slub.c:4188 [inline] __do_kmalloc_node mm/slub.c:4330 [inline] __kmalloc_node_track_caller_noprof+0x2ef/0x4d0 mm/slub.c:4350 __do_krealloc mm/slub.c:4908 [inline] krealloc_noprof+0x10f/0x300 mm/slub.c:4961 bch2_printbuf_make_room+0x1f1/0x350 fs/bcachefs/printbuf.c:59 bch2_prt_printf+0x269/0x6d0 fs/bcachefs/printbuf.c:186 bch2_btree_path_to_text_short+0x8a5/0xfb0 fs/bcachefs/btree_iter.c:1520 __bch2_trans_paths_to_text+0xe5/0x180 fs/bcachefs/btree_iter.c:1575 bch2_trans_update_max_paths+0x173/0x420 fs/bcachefs/btree_iter.c:1611 btree_path_alloc+0x8d9/0xad0 fs/bcachefs/btree_iter.c:1708 bch2_path_get+0xb77/0x1610 fs/bcachefs/btree_iter.c:1759 page last free pid 5321 tgid 5321 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1262 [inline] __free_frozen_pages+0xde8/0x10a0 mm/page_alloc.c:2680 discard_slab mm/slub.c:2720 [inline] __put_partials+0x160/0x1c0 mm/slub.c:3189 put_cpu_partial+0x17e/0x250 mm/slub.c:3264 __slab_free+0x294/0x390 mm/slub.c:4516 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4151 [inline] slab_alloc_node mm/slub.c:4200 [inline] __do_kmalloc_node mm/slub.c:4330 [inline] __kmalloc_noprof+0x238/0x4d0 mm/slub.c:4343 kmalloc_noprof include/linux/slab.h:909 [inline] tomoyo_realpath_from_path+0xcf/0x5e0 security/tomoyo/realpath.c:251 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_number_perm+0x245/0x790 security/tomoyo/file.c:723 security_file_ioctl+0xc6/0x2a0 security/security.c:2913 __do_sys_ioctl fs/ioctl.c:900 [inline] __se_sys_ioctl+0x46/0x160 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff8880370da080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880370da100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8880370da180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880370da200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880370da280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.