CVSS: -EPSS: 0%CPEs: 9EXPL: 0CVE-2024-49867 – btrfs: wait for fixup workers before stopping cleaner kthread during umount
https://notcve.org/view.php?id=CVE-2024-49867
In the Linux kernel, the following vulnerability has been resolved: btrfs: wait for fixup workers before stopping cleaner kthread during umount During unmount, at close_ctree(), we have the following steps in this order: 1) Park the cleaner kthread - this doesn't destroy the kthread, it basically halts its execution (wake ups against it work but do nothing); 2) We stop the cleaner kthread - this results in freeing the respective struct task_struct; 3) We call btrfs_stop_all_workers() which waits for any jobs running in all the work queues and then free the work queues. Syzbot reported a case where a fixup worker resulted in a crash when doing a delayed iput on its inode while attempting to wake up the cleaner at btrfs_add_delayed_iput(), because the task_struct of the cleaner kthread was already freed. This can happen during unmount because we don't wait for any fixup workers still running before we call kthread_stop() against the cleaner kthread, which stops and free all its resources. Fix this by waiting for any fixup workers at close_ctree() before we call kthread_stop() against the cleaner and run pending delayed iputs. The stack traces reported by syzbot were the following: BUG: KASAN: slab-use-after-free in __lock_acquire+0x77/0x2050 kernel/locking/lockdep.c:5065 Read of size 8 at addr ffff8880272a8a18 by task kworker/u8:3/52 CPU: 1 UID: 0 PID: 52 Comm: kworker/u8:3 Not tainted 6.12.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: btrfs-fixup btrfs_work_helper 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 __lock_acquire+0x77/0x2050 kernel/locking/lockdep.c:5065 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162 class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:551 [inline] try_to_wake_up+0xb0/0x1480 kernel/sched/core.c:4154 btrfs_writepage_fixup_worker+0xc16/0xdf0 fs/btrfs/inode.c:2842 btrfs_work_helper+0x390/0xc50 fs/btrfs/async-thread.c:314 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 </TASK> Allocated by task 2: 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:247 [inline] slab_post_alloc_hook mm/slub.c:4086 [inline] slab_alloc_node mm/slub.c:4135 [inline] kmem_cache_alloc_node_noprof+0x16b/0x320 mm/slub.c:4187 alloc_task_struct_node kernel/fork.c:180 [inline] dup_task_struct+0x57/0x8c0 kernel/fork.c:1107 copy_process+0x5d1/0x3d50 kernel/fork.c:2206 kernel_clone+0x223/0x880 kernel/fork.c:2787 kernel_thread+0x1bc/0x240 kernel/fork.c:2849 create_kthread kernel/kthread.c:412 [inline] kthreadd+0x60d/0x810 kernel/kthread.c:765 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Freed by task 61: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_h ---truncated--- • https://git.kernel.org/stable/c/cd686dfff63f27d712877aef5b962fbf6b8bc264 https://git.kernel.org/stable/c/a71349b692ab34ea197949e13e3cc42570fe73d9 https://git.kernel.org/stable/c/70b60c8d9b42763d6629e44f448aa5d8ae477d61 https://git.kernel.org/stable/c/4c98fe0dfa2ae83c4631699695506d8941db4bfe https://git.kernel.org/stable/c/9da40aea63f8769f28afb91aea0fac4cf6fbbb65 https://git.kernel.org/stable/c/ed87190e9d9c80aad220fb6b0b03a84d22e2c95b https://git.kernel.org/stable/c/bf0de0f9a0544c11f96f93206da04ab87dcea1f4 https://git.kernel.org/stable/c/65d11eb276836d49003a8060cf31fa228 •
CVSS: -EPSS: 0%CPEs: 6EXPL: 0CVE-2024-49866 – tracing/timerlat: Fix a race during cpuhp processing
https://notcve.org/view.php?id=CVE-2024-49866
In the Linux kernel, the following vulnerability has been resolved: tracing/timerlat: Fix a race during cpuhp processing There is another found exception that the "timerlat/1" thread was scheduled on CPU0, and lead to timer corruption finally: ``` ODEBUG: init active (active state 0) object: ffff888237c2e108 object type: hrtimer hint: timerlat_irq+0x0/0x220 WARNING: CPU: 0 PID: 426 at lib/debugobjects.c:518 debug_print_object+0x7d/0xb0 Modules linked in: CPU: 0 UID: 0 PID: 426 Comm: timerlat/1 Not tainted 6.11.0-rc7+ #45 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 RIP: 0010:debug_print_object+0x7d/0xb0 ... Call Trace: <TASK> ? __warn+0x7c/0x110 ? debug_print_object+0x7d/0xb0 ? report_bug+0xf1/0x1d0 ? prb_read_valid+0x17/0x20 ? • https://git.kernel.org/stable/c/c8895e271f7994a3ecb13b8a280e39aa53879545 https://git.kernel.org/stable/c/322920b53dc11f9c2b33397eb3ae5bc6a175b60d https://git.kernel.org/stable/c/ce25f33ba89d6eefef64157655d318444580fa14 https://git.kernel.org/stable/c/a6e9849063a6c8f4cb2f652a437e44e3ed24356c https://git.kernel.org/stable/c/a0d9c0cd5856191e095cf43a2e141b73945b7716 https://git.kernel.org/stable/c/f72b451dc75578f644a3019c1489e9ae2c14e6c4 https://git.kernel.org/stable/c/829e0c9f0855f26b3ae830d17b24aec103f7e915 •
CVSS: -EPSS: 0%CPEs: 2EXPL: 0CVE-2024-49865 – drm/xe/vm: move xa_alloc to prevent UAF
https://notcve.org/view.php?id=CVE-2024-49865
In the Linux kernel, the following vulnerability has been resolved: drm/xe/vm: move xa_alloc to prevent UAF Evil user can guess the next id of the vm before the ioctl completes and then call vm destroy ioctl to trigger UAF since create ioctl is still referencing the same vm. Move the xa_alloc all the way to the end to prevent this. v2: - Rebase (cherry picked from commit dcfd3971327f3ee92765154baebbaece833d3ca9) • https://git.kernel.org/stable/c/dd08ebf6c3525a7ea2186e636df064ea47281987 https://git.kernel.org/stable/c/09cf8901fc0225898311b375cfcc67bae37ed5da https://git.kernel.org/stable/c/74231870cf4976f69e83aa24f48edb16619f652f •
CVSS: -EPSS: 0%CPEs: 4EXPL: 0CVE-2024-49864 – rxrpc: Fix a race between socket set up and I/O thread creation
https://notcve.org/view.php?id=CVE-2024-49864
In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix a race between socket set up and I/O thread creation In rxrpc_open_socket(), it sets up the socket and then sets up the I/O thread that will handle it. This is a problem, however, as there's a gap between the two phases in which a packet may come into rxrpc_encap_rcv() from the UDP packet but we oops when trying to wake the not-yet created I/O thread. As a quick fix, just make rxrpc_encap_rcv() discard the packet if there's no I/O thread yet. A better, but more intrusive fix would perhaps be to rearrange things such that the socket creation is done by the I/O thread. • https://git.kernel.org/stable/c/a275da62e8c111b897b9cb73eb91df2f4e475ca5 https://git.kernel.org/stable/c/cdf4bbbdb956d7426f687f38757ebca2a2759a0f https://git.kernel.org/stable/c/56e415202b8a17de6496f4023e545fcb66f118ec https://git.kernel.org/stable/c/c64f5fc95e9612fdf75587c8e21e494e614c18e2 https://git.kernel.org/stable/c/bc212465326e8587325f520a052346f0b57360e6 •
CVSS: -EPSS: 0%CPEs: 7EXPL: 0CVE-2024-49863 – vhost/scsi: null-ptr-dereference in vhost_scsi_get_req()
https://notcve.org/view.php?id=CVE-2024-49863
In the Linux kernel, the following vulnerability has been resolved: vhost/scsi: null-ptr-dereference in vhost_scsi_get_req() Since commit 3f8ca2e115e5 ("vhost/scsi: Extract common handling code from control queue handler") a null pointer dereference bug can be triggered when guest sends an SCSI AN request. In vhost_scsi_ctl_handle_vq(), `vc.target` is assigned with `&v_req.tmf.lun[1]` within a switch-case block and is then passed to vhost_scsi_get_req() which extracts `vc->req` and `tpg`. However, for a `VIRTIO_SCSI_T_AN_*` request, tpg is not required, so `vc.target` is set to NULL in this branch. Later, in vhost_scsi_get_req(), `vc->target` is dereferenced without being checked, leading to a null pointer dereference bug. This bug can be triggered from guest. When this bug occurs, the vhost_worker process is killed while holding `vq->mutex` and the corresponding tpg will remain occupied indefinitely. Below is the KASAN report: Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 PID: 840 Comm: poc Not tainted 6.10.0+ #1 Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:vhost_scsi_get_req+0x165/0x3a0 Code: 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 2b 02 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8b 65 30 4c 89 e2 48 c1 ea 03 <0f> b6 04 02 4c 89 e2 83 e2 07 38 d0 7f 08 84 c0 0f 85 be 01 00 00 RSP: 0018:ffff888017affb50 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff88801b000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888017affcb8 RBP: ffff888017affb80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffff888017affc88 R14: ffff888017affd1c R15: ffff888017993000 FS: 000055556e076500(0000) GS:ffff88806b100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000200027c0 CR3: 0000000010ed0004 CR4: 0000000000370ef0 Call Trace: <TASK> ? show_regs+0x86/0xa0 ? • https://git.kernel.org/stable/c/3f8ca2e115e55af4c15d97dda635e948d2e380be https://git.kernel.org/stable/c/6592347f06e2b19a624270a85ad4b3ae48c3b241 https://git.kernel.org/stable/c/46128370a72c431df733af5ebb065c4d48c9ad39 https://git.kernel.org/stable/c/ace9c778a214da9c98d7b69d904d1b0816f4f681 https://git.kernel.org/stable/c/25613e6d9841a1f9fb985be90df921fa99f800de https://git.kernel.org/stable/c/00fb5b23e1c9cdbe496f5cd6b40367cb895f6c93 https://git.kernel.org/stable/c/61517f33e76d2c5247c1e61e668693afe5b67e6f https://git.kernel.org/stable/c/221af82f606d928ccef19a16d35633c63 •