| From bippy-1.2.0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@kernel.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2025-37928: dm-bufio: don't schedule in atomic context |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| dm-bufio: don't schedule in atomic context |
| |
| A BUG was reported as below when CONFIG_DEBUG_ATOMIC_SLEEP and |
| try_verify_in_tasklet are enabled. |
| [ 129.444685][ T934] BUG: sleeping function called from invalid context at drivers/md/dm-bufio.c:2421 |
| [ 129.444723][ T934] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 934, name: kworker/1:4 |
| [ 129.444740][ T934] preempt_count: 201, expected: 0 |
| [ 129.444756][ T934] RCU nest depth: 0, expected: 0 |
| [ 129.444781][ T934] Preemption disabled at: |
| [ 129.444789][ T934] [<ffffffd816231900>] shrink_work+0x21c/0x248 |
| [ 129.445167][ T934] kernel BUG at kernel/sched/walt/walt_debug.c:16! |
| [ 129.445183][ T934] Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP |
| [ 129.445204][ T934] Skip md ftrace buffer dump for: 0x1609e0 |
| [ 129.447348][ T934] CPU: 1 PID: 934 Comm: kworker/1:4 Tainted: G W OE 6.6.56-android15-8-o-g6f82312b30b9-debug #1 1400000003000000474e5500b3187743670464e8 |
| [ 129.447362][ T934] Hardware name: Qualcomm Technologies, Inc. Parrot QRD, Alpha-M (DT) |
| [ 129.447373][ T934] Workqueue: dm_bufio_cache shrink_work |
| [ 129.447394][ T934] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) |
| [ 129.447406][ T934] pc : android_rvh_schedule_bug+0x0/0x8 [sched_walt_debug] |
| [ 129.447435][ T934] lr : __traceiter_android_rvh_schedule_bug+0x44/0x6c |
| [ 129.447451][ T934] sp : ffffffc0843dbc90 |
| [ 129.447459][ T934] x29: ffffffc0843dbc90 x28: ffffffffffffffff x27: 0000000000000c8b |
| [ 129.447479][ T934] x26: 0000000000000040 x25: ffffff804b3d6260 x24: ffffffd816232b68 |
| [ 129.447497][ T934] x23: ffffff805171c5b4 x22: 0000000000000000 x21: ffffffd816231900 |
| [ 129.447517][ T934] x20: ffffff80306ba898 x19: 0000000000000000 x18: ffffffc084159030 |
| [ 129.447535][ T934] x17: 00000000d2b5dd1f x16: 00000000d2b5dd1f x15: ffffffd816720358 |
| [ 129.447554][ T934] x14: 0000000000000004 x13: ffffff89ef978000 x12: 0000000000000003 |
| [ 129.447572][ T934] x11: ffffffd817a823c4 x10: 0000000000000202 x9 : 7e779c5735de9400 |
| [ 129.447591][ T934] x8 : ffffffd81560d004 x7 : 205b5d3938373434 x6 : ffffffd8167397c8 |
| [ 129.447610][ T934] x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffffffc0843db9e0 |
| [ 129.447629][ T934] x2 : 0000000000002f15 x1 : 0000000000000000 x0 : 0000000000000000 |
| [ 129.447647][ T934] Call trace: |
| [ 129.447655][ T934] android_rvh_schedule_bug+0x0/0x8 [sched_walt_debug 1400000003000000474e550080cce8a8a78606b6] |
| [ 129.447681][ T934] __might_resched+0x190/0x1a8 |
| [ 129.447694][ T934] shrink_work+0x180/0x248 |
| [ 129.447706][ T934] process_one_work+0x260/0x624 |
| [ 129.447718][ T934] worker_thread+0x28c/0x454 |
| [ 129.447729][ T934] kthread+0x118/0x158 |
| [ 129.447742][ T934] ret_from_fork+0x10/0x20 |
| [ 129.447761][ T934] Code: ???????? ???????? ???????? d2b5dd1f (d4210000) |
| [ 129.447772][ T934] ---[ end trace 0000000000000000 ]--- |
| |
| dm_bufio_lock will call spin_lock_bh when try_verify_in_tasklet |
| is enabled, and __scan will be called in atomic context. |
| |
| The Linux kernel CVE team has assigned CVE-2025-37928 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 4.9 with commit 7cd326747f46ffe1c7bff5682e97dfbcb98990ec and fixed in 6.1.138 with commit a99f5bf4f7197009859dbce14c12f8e2ce5a5a69 |
| Issue introduced in 4.9 with commit 7cd326747f46ffe1c7bff5682e97dfbcb98990ec and fixed in 6.6.90 with commit c8c83052283bcf2fdd467a33d1d2bd5ba36e935a |
| Issue introduced in 4.9 with commit 7cd326747f46ffe1c7bff5682e97dfbcb98990ec and fixed in 6.12.28 with commit f45108257280e0a1cc951ce254853721b40c0812 |
| Issue introduced in 4.9 with commit 7cd326747f46ffe1c7bff5682e97dfbcb98990ec and fixed in 6.14.6 with commit 69a37b3ba85088fc6b903b8e1db7f0a1d4d0b52d |
| Issue introduced in 4.9 with commit 7cd326747f46ffe1c7bff5682e97dfbcb98990ec and fixed in 6.15 with commit a3d8f0a7f5e8b193db509c7191fefeed3533fc44 |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2025-37928 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| drivers/md/dm-bufio.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/a99f5bf4f7197009859dbce14c12f8e2ce5a5a69 |
| https://git.kernel.org/stable/c/c8c83052283bcf2fdd467a33d1d2bd5ba36e935a |
| https://git.kernel.org/stable/c/f45108257280e0a1cc951ce254853721b40c0812 |
| https://git.kernel.org/stable/c/69a37b3ba85088fc6b903b8e1db7f0a1d4d0b52d |
| https://git.kernel.org/stable/c/a3d8f0a7f5e8b193db509c7191fefeed3533fc44 |
