| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <0000000000003d3747060ed5e859@google.com> Date: Sat, 13 Jan 2024 08:02:27 -0800 From: syzbot <syzbot+905d785c4923bea2c1db@...kaller.appspotmail.com> To: axboe@...nel.dk, linux-block@...r.kernel.org, linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com Subject: [syzbot] [block?] KMSAN: kernel-infoleak in filemap_read Hello, syzbot found the following issue on: HEAD commit: 861deac3b092 Linux 6.7-rc7 git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=14d12f76e80000 kernel config: https://syzkaller.appspot.com/x/.config?x=e0c7078a6b901aa3 dashboard link: https://syzkaller.appspot.com/bug?extid=905d785c4923bea2c1db 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=15ef73d6e80000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15d27f76e80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/0ea60ee8ed32/disk-861deac3.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/6d69fdc33021/vmlinux-861deac3.xz kernel image: https://storage.googleapis.com/syzbot-assets/f0158750d452/bzImage-861deac3.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/52b4443ce279/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+905d785c4923bea2c1db@...kaller.appspotmail.com ===================================================== BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:114 [inline] BUG: KMSAN: kernel-infoleak in copy_to_user_iter lib/iov_iter.c:24 [inline] BUG: KMSAN: kernel-infoleak in iterate_ubuf include/linux/iov_iter.h:29 [inline] BUG: KMSAN: kernel-infoleak in iterate_and_advance2 include/linux/iov_iter.h:245 [inline] BUG: KMSAN: kernel-infoleak in iterate_and_advance include/linux/iov_iter.h:271 [inline] BUG: KMSAN: kernel-infoleak in _copy_to_iter+0x364/0x2520 lib/iov_iter.c:186 instrument_copy_to_user include/linux/instrumented.h:114 [inline] copy_to_user_iter lib/iov_iter.c:24 [inline] iterate_ubuf include/linux/iov_iter.h:29 [inline] iterate_and_advance2 include/linux/iov_iter.h:245 [inline] iterate_and_advance include/linux/iov_iter.h:271 [inline] _copy_to_iter+0x364/0x2520 lib/iov_iter.c:186 copy_page_to_iter+0x419/0x870 lib/iov_iter.c:381 copy_folio_to_iter include/linux/uio.h:181 [inline] filemap_read+0xc00/0x14d0 mm/filemap.c:2644 blkdev_read_iter+0x6c0/0x8e0 block/fops.c:742 call_read_iter include/linux/fs.h:2014 [inline] new_sync_read fs/read_write.c:389 [inline] vfs_read+0x8f6/0xe00 fs/read_write.c:470 ksys_read+0x20f/0x4c0 fs/read_write.c:613 __do_sys_read fs/read_write.c:623 [inline] __se_sys_read fs/read_write.c:621 [inline] __x64_sys_read+0x93/0xd0 fs/read_write.c:621 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b Uninit was stored to memory at: memcpy_to_iter lib/iov_iter.c:65 [inline] iterate_bvec include/linux/iov_iter.h:122 [inline] iterate_and_advance2 include/linux/iov_iter.h:249 [inline] iterate_and_advance include/linux/iov_iter.h:271 [inline] _copy_to_iter+0xe41/0x2520 lib/iov_iter.c:186 copy_page_to_iter+0x419/0x870 lib/iov_iter.c:381 shmem_file_read_iter+0xa0a/0x12b0 mm/shmem.c:2841 do_iter_read+0xd21/0x1380 fs/read_write.c:795 vfs_iter_read+0x8e/0xe0 fs/read_write.c:837 lo_read_simple drivers/block/loop.c:290 [inline] do_req_filebacked drivers/block/loop.c:500 [inline] loop_handle_cmd drivers/block/loop.c:1915 [inline] loop_process_work+0x12e7/0x39d0 drivers/block/loop.c:1950 loop_rootcg_workfn+0x2b/0x30 drivers/block/loop.c:1981 process_one_work kernel/workqueue.c:2627 [inline] process_scheduled_works+0x104e/0x1e70 kernel/workqueue.c:2700 worker_thread+0xf45/0x1490 kernel/workqueue.c:2781 kthread+0x3ed/0x540 kernel/kthread.c:388 ret_from_fork+0x66/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 Uninit was stored to memory at: memcpy_from_iter lib/iov_iter.c:73 [inline] iterate_bvec include/linux/iov_iter.h:122 [inline] iterate_and_advance2 include/linux/iov_iter.h:249 [inline] iterate_and_advance include/linux/iov_iter.h:271 [inline] __copy_from_iter lib/iov_iter.c:268 [inline] copy_page_from_iter_atomic+0x12f1/0x2b70 lib/iov_iter.c:500 generic_perform_write+0x4ae/0xc40 mm/filemap.c:3926 shmem_file_write_iter+0x2b5/0x2e0 mm/shmem.c:2895 do_iter_write+0xceb/0x1340 fs/read_write.c:860 vfs_iter_write+0x8e/0xe0 fs/read_write.c:901 lo_write_bvec drivers/block/loop.c:249 [inline] lo_write_simple drivers/block/loop.c:271 [inline] do_req_filebacked drivers/block/loop.c:495 [inline] loop_handle_cmd drivers/block/loop.c:1915 [inline] loop_process_work+0x20c3/0x39d0 drivers/block/loop.c:1950 loop_rootcg_workfn+0x2b/0x30 drivers/block/loop.c:1981 process_one_work kernel/workqueue.c:2627 [inline] process_scheduled_works+0x104e/0x1e70 kernel/workqueue.c:2700 worker_thread+0xf45/0x1490 kernel/workqueue.c:2781 kthread+0x3ed/0x540 kernel/kthread.c:388 ret_from_fork+0x66/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 Uninit was stored to memory at: memcpy_to_page include/linux/highmem.h:427 [inline] hfsplus_bnode_write+0xee/0x2e0 fs/hfsplus/bnode.c:83 hfsplus_brec_insert+0xa9d/0x1400 fs/hfsplus/brec.c:133 hfsplus_create_cat+0x1309/0x1810 fs/hfsplus/catalog.c:308 hfsplus_link+0x7d8/0xbf0 fs/hfsplus/dir.c:342 vfs_link+0x936/0xb60 fs/namei.c:4588 do_linkat+0x6e1/0x1160 fs/namei.c:4659 __do_sys_link fs/namei.c:4693 [inline] __se_sys_link fs/namei.c:4691 [inline] __x64_sys_link+0xec/0x140 fs/namei.c:4691 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b Uninit was stored to memory at: hfsplus_cat_build_record fs/hfsplus/catalog.c:167 [inline] hfsplus_create_cat+0x11d1/0x1810 fs/hfsplus/catalog.c:300 hfsplus_link+0x7d8/0xbf0 fs/hfsplus/dir.c:342 vfs_link+0x936/0xb60 fs/namei.c:4588 do_linkat+0x6e1/0x1160 fs/namei.c:4659 __do_sys_link fs/namei.c:4693 [inline] __se_sys_link fs/namei.c:4691 [inline] __x64_sys_link+0xec/0x140 fs/namei.c:4691 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b Uninit was created at: __alloc_pages+0x9a4/0xe00 mm/page_alloc.c:4591 alloc_pages_mpol+0x62b/0x9d0 mm/mempolicy.c:2133 alloc_pages+0x1be/0x1e0 mm/mempolicy.c:2204 alloc_slab_page mm/slub.c:1870 [inline] allocate_slab mm/slub.c:2017 [inline] new_slab+0x421/0x1570 mm/slub.c:2070 ___slab_alloc+0x13db/0x33d0 mm/slub.c:3223 __slab_alloc mm/slub.c:3322 [inline] __slab_alloc_node mm/slub.c:3375 [inline] slab_alloc_node mm/slub.c:3468 [inline] slab_alloc mm/slub.c:3486 [inline] __kmem_cache_alloc_lru mm/slub.c:3493 [inline] kmem_cache_alloc_lru+0x552/0x970 mm/slub.c:3509 alloc_inode_sb include/linux/fs.h:2937 [inline] hfsplus_alloc_inode+0x5a/0xc0 fs/hfsplus/super.c:627 alloc_inode+0x83/0x440 fs/inode.c:261 iget_locked+0x2dd/0xe80 fs/inode.c:1316 hfsplus_iget+0x59/0xaf0 fs/hfsplus/super.c:64 hfsplus_btree_open+0x13e/0x1d00 fs/hfsplus/btree.c:150 hfsplus_fill_super+0x1113/0x26f0 fs/hfsplus/super.c:473 mount_bdev+0x3d7/0x560 fs/super.c:1650 hfsplus_mount+0x4d/0x60 fs/hfsplus/super.c:641 legacy_get_tree+0x110/0x290 fs/fs_context.c:662 vfs_get_tree+0xa5/0x520 fs/super.c:1771 do_new_mount+0x68d/0x1550 fs/namespace.c:3337 path_mount+0x73d/0x1f20 fs/namespace.c:3664 do_mount fs/namespace.c:3677 [inline] __do_sys_mount fs/namespace.c:3886 [inline] __se_sys_mount+0x725/0x810 fs/namespace.c:3863 __x64_sys_mount+0xe4/0x140 fs/namespace.c:3863 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b Bytes 3258-3261 of 4096 are uninitialized Memory access of size 4096 starts at ffff8881146b8000 Data copied to user address 000055ff3929d058 CPU: 1 PID: 5003 Comm: udevd Not tainted 6.7.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 ===================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@...glegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title 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. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
Powered by blists - more mailing lists