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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: zoned: allocate dummy checksums for zoned NODATASUM writes\n\nShin\u0027ichiro reported that when he\u0027s running fstests\u0027 test-case\nbtrfs/167 on emulated zoned devices, he\u0027s seeing the following NULL\npointer dereference in \u0027btrfs_zone_finish_endio()\u0027:\n\n  Oops: general protection fault, probably for non-canonical address 0xdffffc0000000011: 0000 [#1] PREEMPT SMP KASAN NOPTI\n  KASAN: null-ptr-deref in range [0x0000000000000088-0x000000000000008f]\n  CPU: 4 PID: 2332440 Comm: kworker/u80:15 Tainted: G        W          6.10.0-rc2-kts+ #4\n  Hardware name: Supermicro Super Server/X11SPi-TF, BIOS 3.3 02/21/2020\n  Workqueue: btrfs-endio-write btrfs_work_helper [btrfs]\n  RIP: 0010:btrfs_zone_finish_endio.part.0+0x34/0x160 [btrfs]\n\n  RSP: 0018:ffff88867f107a90 EFLAGS: 00010206\n  RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff893e5534\n  RDX: 0000000000000011 RSI: 0000000000000004 RDI: 0000000000000088\n  RBP: 0000000000000002 R08: 0000000000000001 R09: ffffed1081696028\n  R10: ffff88840b4b0143 R11: ffff88834dfff600 R12: ffff88840b4b0000\n  R13: 0000000000020000 R14: 0000000000000000 R15: ffff888530ad5210\n  FS:  0000000000000000(0000) GS:ffff888e3f800000(0000) knlGS:0000000000000000\n  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n  CR2: 00007f87223fff38 CR3: 00000007a7c6a002 CR4: 00000000007706f0\n  DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n  DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n  PKRU: 55555554\n  Call Trace:\n   \u003cTASK\u003e\n   ? __die_body.cold+0x19/0x27\n   ? die_addr+0x46/0x70\n   ? exc_general_protection+0x14f/0x250\n   ? asm_exc_general_protection+0x26/0x30\n   ? do_raw_read_unlock+0x44/0x70\n   ? btrfs_zone_finish_endio.part.0+0x34/0x160 [btrfs]\n   btrfs_finish_one_ordered+0x5d9/0x19a0 [btrfs]\n   ? __pfx_lock_release+0x10/0x10\n   ? do_raw_write_lock+0x90/0x260\n   ? __pfx_do_raw_write_lock+0x10/0x10\n   ? __pfx_btrfs_finish_one_ordered+0x10/0x10 [btrfs]\n   ? _raw_write_unlock+0x23/0x40\n   ? btrfs_finish_ordered_zoned+0x5a9/0x850 [btrfs]\n   ? lock_acquire+0x435/0x500\n   btrfs_work_helper+0x1b1/0xa70 [btrfs]\n   ? __schedule+0x10a8/0x60b0\n   ? __pfx___might_resched+0x10/0x10\n   process_one_work+0x862/0x1410\n   ? __pfx_lock_acquire+0x10/0x10\n   ? __pfx_process_one_work+0x10/0x10\n   ? assign_work+0x16c/0x240\n   worker_thread+0x5e6/0x1010\n   ? __pfx_worker_thread+0x10/0x10\n   kthread+0x2c3/0x3a0\n   ? trace_irq_enable.constprop.0+0xce/0x110\n   ? __pfx_kthread+0x10/0x10\n   ret_from_fork+0x31/0x70\n   ? __pfx_kthread+0x10/0x10\n   ret_from_fork_asm+0x1a/0x30\n   \u003c/TASK\u003e\n\nEnabling CONFIG_BTRFS_ASSERT revealed the following assertion to\ntrigger:\n\n  assertion failed: !list_empty(\u0026ordered-\u003elist), in fs/btrfs/zoned.c:1815\n\nThis indicates, that we\u0027re missing the checksums list on the\nordered_extent. As btrfs/167 is doing a NOCOW write this is to be\nexpected.\n\nFurther analysis with drgn confirmed the assumption:\n\n  \u003e\u003e\u003e inode = prog.crashed_thread().stack_trace()[11][\u0027ordered\u0027].inode\n  \u003e\u003e\u003e btrfs_inode = drgn.container_of(inode, \"struct btrfs_inode\", \\\n         \t\t\t\t\"vfs_inode\")\n  \u003e\u003e\u003e print(btrfs_inode.flags)\n  (u32)1\n\nAs zoned emulation mode simulates conventional zones on regular devices,\nwe cannot use zone-append for writing. But we\u0027re only attaching dummy\nchecksums if we\u0027re doing a zone-append write.\n\nSo for NOCOW zoned data writes on conventional zones, also attach a\ndummy checksum."
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        "dateUpdated": "2026-05-11T20:23:12.508Z",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2024-40962",
    "datePublished": "2024-07-12T12:32:03.316Z",
    "dateReserved": "2024-07-12T12:17:45.594Z",
    "dateUpdated": "2026-05-11T20:23:12.508Z",
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